CN109267982B - Staged fracturing and water control well completion method, tubular column and underground sliding sleeve switch system - Google Patents
Staged fracturing and water control well completion method, tubular column and underground sliding sleeve switch system Download PDFInfo
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- CN109267982B CN109267982B CN201710580590.3A CN201710580590A CN109267982B CN 109267982 B CN109267982 B CN 109267982B CN 201710580590 A CN201710580590 A CN 201710580590A CN 109267982 B CN109267982 B CN 109267982B
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- 239000003638 chemical reducing agent Substances 0.000 claims description 20
- 239000012530 fluid Substances 0.000 claims description 17
- 238000005086 pumping Methods 0.000 claims description 8
- 238000005096 rolling process Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
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- 230000002829 reductive effect Effects 0.000 description 3
- 239000000306 component Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 210000002445 nipple Anatomy 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000000903 blocking effect Effects 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
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- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
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Abstract
The invention provides a staged fracturing and water control well completion method, a tubular column and an underground sliding sleeve switch system, and belongs to the technical field of well completion and production of oil and gas wells. The method comprises the following steps: (1) putting a pipe column: the pipe column is lowered to a preset position, and the packer is well-fixed or set under pressure; (2) first-stage fracturing: the pressure is suppressed in the sleeve, the first-stage switch sliding sleeve is opened for fracturing, and after fracturing is finished, the pressure is suppressed to enable the switch sliding sleeve to be kept in an open state under static pressure; (3) a downhole sliding sleeve switch system is put in, the front stage sliding sleeve is closed, the rear stage sliding sleeve is opened, and fracturing is carried out; (4) repeating the step (3) until fracturing of each stage is completed; (5) putting into production: a downhole sliding sleeve switch system is put in, and switch sliding sleeves at all stages are opened to carry out production; (6) controlling water: after a certain fracturing section is discharged at the later stage, the corresponding switch sliding sleeve is closed by the underground sliding sleeve switch system, and other sections are continuously produced, so that the segmented well completion function is realized.
Description
Technical Field
The invention belongs to the technical field of well completion and production of oil and gas wells, and particularly relates to a staged fracturing and water control well completion method, a tubular column and an underground sliding sleeve switch system.
Background
Along with the exploration and development of unconventional oil and gas resources such as shale gas, shale oil and the like, the staged fracturing modification technology of the horizontal well is effectively implemented. The reservoir fracturing modification technology divides horizontal wells such as shale oil gas and tight rock stratum into multiple sections, then fractures the stratum into multiple cracks, enlarges oil drainage area of an oil gas production layer, and improves oil gas recovery ratio, thereby improving single well yield. The horizontal well open hole staged fracturing technology is one of reservoir fracturing reconstruction and is widely popularized and applied to unconventional oil and gas fields at home and abroad, wherein a flow passage is established with each section of a reservoir through a sliding sleeve. According to the technology, whether fracturing is carried out on different layers according to construction design or not can be realized, and a sliding sleeve tool for establishing a flow passage with a stratum in a well completion string is one of key technologies.
The multistage ball injection sliding sleeve mainly adopted by the current sliding sleeve for segmented completion adopts low-density fracturing balls with different diameters to be injected into the sliding sleeve ball seat and then is pressed through a wellhead to control the opening of each sliding sleeve, thereby realizing multistage segmented and layered fracturing, having the advantage of convenient construction, and being 7' × 4 for the prior art1/2"the sleeve achieves 25 stages of maximum voltage division, at 95/8″×51/2"the sleeve achieves a maximum pressure division level of 30 steps, a blocking ball step difference of 0.125", and a step difference of 1/16 "has been recently achieved.
The pump composite cable bridge plug staged fracturing technology adopts the cable to rapidly drop the nonmetal bridge plug for staged operation, can complete the bridge plug dropping, setting, releasing and multi-stage perforation at one time, can realize staged fracturing of any stage, but has relatively complex process.
In the TAP staged fracturing well completion process of Schlumberger, a preset fracturing sliding sleeve is arranged on a sleeve, a hydraulic pipeline is externally used for connecting the sliding sleeves, and each stage of sliding sleeve is opened step by throwing darts, so that staged fracturing is realized. The technology can theoretically realize staged fracturing of any number of stages, but the technology is complex and has higher requirements on drilling and casing running levels.
Aiming at delaying the coning speed of the bottom water of the side-bottom water reservoir, deep theoretical research is carried out at home and abroad, and water control technologies such as an inclined well arrangement method, a variable density perforation, a variable blind sieve ratio sieve tube, a central tube method, an ICD flow regulation and control sieve tube and the like are matched, but the technologies mainly aim at the production pressure difference caused by variable mass flow of a horizontal section and achieve the balance of the inflow section of the horizontal section by controlling the local production pressure difference, thereby preventing the local coning
In the aspect of intelligent sliding sleeves, the intelligent sliding sleeves developed by virtue of foreign wedefour can realize the function of controlling the opening and closing of the sliding sleeves by utilizing RFID tags, so that the functions of staged fracturing and staged water plugging are realized, but because each intelligent sliding sleeve is provided with an intelligent control system, a communication system, a mechanical execution system, a power supply system and the like, the outer diameter is larger, the inner drift diameter is smaller, the cost of a single sliding sleeve is higher, the cost of applying a plurality of sliding sleeves to each well is too high, and therefore, the intelligent sliding sleeves are only used as a storage technology and do not enter the field application.
In summary, aiming at the problem of low natural productivity of the horizontal well with low permeability reservoir, the multi-stage staged fracturing modification measures are widely carried out abroad, particularly, with the development of shale gas, the multi-stage large-scale staged fracturing process is rapidly developed, and the highest fracturing stage number at present reaches 40 stages, so that the method becomes a main key technology for shale gas development. The main multistage staged fracturing technologies at present comprise a multistage pitching sliding sleeve staged fracturing technology, a hydraulic jetting staged fracturing technology, a pumping composite cable bridge plug staged fracturing technology, a Slenbach TAP staged fracturing technology and the like, but different problems of limited staged stages, limited pipe drift diameter, limited construction scale, low construction speed, incapability of performing later-stage control production after yield-increasing construction and the like exist.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a staged fracturing and water control well completion method, a tubular column and an underground sliding sleeve switching system.
The invention is realized by the following technical scheme:
a staged fracturing and water control well completion method comprising:
(1) putting a pipe column: the pipe column is lowered to a preset position, and the packer is well-fixed or set under pressure;
(2) first-stage fracturing: the pressure is suppressed in the sleeve, the first-stage switch sliding sleeve is opened for fracturing, and after fracturing is finished, the pressure is suppressed to enable the switch sliding sleeve to be kept in an open state under static pressure;
(3) a downhole sliding sleeve switch system is put in, the front stage sliding sleeve is closed, the rear stage sliding sleeve is opened, and fracturing is carried out;
(4) repeating the step (3) until fracturing of each stage is completed;
(5) putting into production: a downhole sliding sleeve switch system is put in, and switch sliding sleeves at all stages are opened to carry out production;
(6) controlling water: after a certain fracturing section is discharged at the later stage, the corresponding switch sliding sleeve is closed by the underground sliding sleeve switch system, and other sections are continuously produced, so that the segmented well completion function is realized.
The step (3) is realized by the following steps:
after the previous stage of fracturing is completed, a downhole sliding sleeve switch system is lowered into the casing, after the downhole sliding sleeve switch system is roughly judged to pass through a previous stage switch sliding sleeve through the cable length, the downhole sliding sleeve switch system is operated to retract a pumping leather cup, then the downhole sliding sleeve switch system is lifted upwards, the downhole sliding sleeve switch system is judged to be in place by using a sound wave positioner in the downhole sliding sleeve switch system, the lifting is stopped, then the downhole sliding sleeve switch system is operated, two operating claws are opened to respectively bite the casing and the inner wall of the sliding sleeve, and then the operating claws are rotated to close the previous stage switch sliding sleeve;
then, the underground sliding sleeve opening and closing system is lifted up to the position of the next-stage switch sliding sleeve, the underground sliding sleeve opening and closing system is stopped being lifted up after the positioning, then the underground sliding sleeve opening and closing system is operated, the two operation claws are opened to respectively bite the sleeve and the inner wall of the sliding sleeve, and then the operation claws are rotated to open the next-stage switch sliding sleeve;
and retracting the operating claw, lifting the underground sliding sleeve switch system out of the ground, and fracturing from the inside of the casing.
The pipe column for realizing the staged fracturing and water control well completion method comprises a plurality of groups of switch sliding sleeves and positioning mark short sections which are connected by a sleeve, wherein the switch sliding sleeves and the positioning mark short sections in each group are directly connected;
a mark groove is formed in the positioning mark short section;
the switch sliding sleeve comprises an upper joint, an outer sleeve and a lower joint which are connected in sequence;
a sealing inner sleeve is arranged in the inner cavity of the outer sleeve, and a sliding sleeve screw rod is arranged in the inner cavity of the sealing inner sleeve;
a fracturing fluid circulation hole is formed in the wall of the outer sleeve;
the sliding sleeve screw rod is of a cylindrical structure, and two ends of the sliding sleeve screw rod are respectively propped against a step at the lower part of the upper joint and a step at the upper part of the lower joint; the lower part of the sliding sleeve screw rod is provided with an external thread;
the sliding sleeve lead screw is in clearance fit with the sealing inner sleeve; the lower part of the sealing inner sleeve is provided with an internal thread which is meshed with an external thread on a sliding sleeve screw rod;
the lower part of the sealing inner sleeve is provided with a guide groove which is parallel to the axial direction of the sealing inner sleeve;
an anti-rotation pin is arranged at the lower part of the outer sleeve, and the protruding part of the anti-rotation pin is positioned in the guide groove;
the sliding sleeve lead screw drives the sealing inner sleeve to move along the axial direction when rotating, so that the opening or closing of the circulation hole is realized, and the circulation hole is safely sealed by the sealing inner sleeve. The sliding sleeve screw rod is provided with holes which are uniformly distributed in the circumferential direction, and the size and the number of the holes can be met as long as the total area of the holes meets the overcurrent requirement.
6-10 fracturing fluid circulation holes uniformly distributed in the circumferential direction are formed in the outer sleeve; during fracturing, the fracturing fluid flows from the inside to the outside (the stratum), and during production, oil and gas flow from the outside to the inside.
The fracturing fluid circulation hole is a long round hole, and the length direction of the fracturing fluid circulation hole is parallel to the axial direction of the outer sleeve.
The holes in the sliding sleeve screw and the holes in the outer sleeve are flow passage, and have no strict requirement on the size, but the total area of the flow passage is usually required not to generate large throttling to the high discharge capacity during fracturing.
Two groups of O-shaped sealing rings are arranged at two ends of the outer surface of the inner sealing sleeve, and when the sliding sleeve is closed, the two groups of O-shaped sealing rings are respectively positioned above and below the fracturing fluid circulation hole on the outer sleeve;
the axial distance between the two groups of O-shaped sealing rings is 20-40mm longer than the length of a fracturing fluid circulation hole on the outer sleeve;
the lower end of the upper joint is inserted into an inner cavity of the upper part of the outer sleeve and is connected with the upper part of the outer sleeve through threads, and an O-shaped sealing ring is arranged at the joint of the upper joint and the outer sleeve;
the lower part of the outer sleeve is inserted into the inner cavity of the lower joint and is in threaded connection with the upper part of the lower joint, and an O-shaped sealing ring is arranged at the joint of the lower joint and the lower joint.
A downhole sliding sleeve opening and closing system for opening and closing a switch sliding sleeve comprises a sound wave positioner and an electric control sliding sleeve opening and closing tool, wherein the sound wave positioner is directly connected with the electric control sliding sleeve opening and closing tool, and the distance between the sound wave positioner and the electric control sliding sleeve opening and closing tool is equal to the distance between a mark groove on a positioning mark short section and the switch sliding sleeve;
the underground electric control sliding sleeve opening and closing tool comprises a sleeve clamping mechanism, a sliding sleeve rotating mechanism and a sliding sleeve clamping mechanism which are connected in sequence;
the sleeve clamping mechanism and the sliding sleeve clamping mechanism are arranged in a mirror symmetry mode and respectively comprise a power device, a screw-nut pair and an operating claw; the screw rod nut pair drives the operating claw to open or retract;
sliding sleeve rotary mechanism includes rotating electrical machines and third connector, rotating electrical machines passes through the third connector drive the operating claw rotation in the tight mechanism is stung to the sliding sleeve.
The power device of the sleeve pipe gripping mechanism and the sliding sleeve gripping mechanism comprises: the motor, the reducer and the connecting mechanism;
the screw-nut pair comprises: the transmission shaft, the transmission nut and the first connecting head; the transmission shaft is provided with a thread to form a lead screw, and the transmission shaft and a transmission nut form a lead screw nut pair;
the motor is connected with the speed reducer, and an output shaft of the speed reducer is connected with one end of the transmission shaft through the connecting mechanism; the middle part of the inner cavity of the first connecting head is a small-aperture section, the two ends of the inner cavity of the first connecting head are large-aperture sections, the inner wall of the small-aperture section is in contact with the outer wall of the transmission shaft, and an O-shaped sealing ring is arranged between the small-aperture section and the transmission shaft;
the rolling bearing is arranged in the large-aperture section facing one side of the motor, the transmission nut is arranged in the large-aperture section on the other side of the motor, the inner wall of the large-aperture section is provided with a groove, the outer wall of the transmission shaft at the position is provided with threads, and when the transmission shaft rotates forwards and backwards, the transmission nut can move in the groove in a reciprocating mode along the axial direction.
The operating claw comprises a driving arm outer sleeve, and a supporting arm thrust seat, a crank slider mechanism and a thrust seat fixing sleeve which are arranged in an inner cavity of the driving arm outer sleeve;
an axial hole is formed in the outer sleeve of the driving arm;
the crank slider mechanism comprises a first driving arm and a second driving arm, one end of the first driving arm is connected with one end of the supporting arm thrust seat through a pin, the other end of the first driving arm is connected with one end of the second driving arm through a pin, and the other end of the second driving arm is connected with the thrust seat fixing sleeve through a pin;
the end face of the other end of the support arm thrust seat is connected with the end face of the transmission nut through a compression spring, and when the transmission nut moves axially, the support arm thrust seat is driven to move axially to push the first transmission arm and the second transmission arm to radially expand or retract.
The connecting mechanism comprises a coupler, a slip ring shaft, a slip ring and a flat key fixing sleeve; the output shaft of the speed reducer is connected with one end of a sliding ring shaft through a coupler, the other end of the sliding ring shaft is connected with one end of a transmission shaft through a flat key fixing sleeve, and the sliding ring is sleeved on the sliding ring shaft.
The sleeve clamping mechanism and the sliding sleeve clamping mechanism both comprise a plug, a motor sealing sleeve and a motor fixing sleeve; the plug is connected with one end of the motor sealing sleeve, and the other end of the motor sealing sleeve is connected with one end of the first connecting head;
the motor fixing sleeve is arranged in the inner cavity of the motor sealing sleeve, and the power device is arranged in the motor fixing sleeve.
The slip ring adopts the via hole formula slip ring, the transmission shaft is opened has centre bore and side opening.
The motor in the sleeve pipe gripping mechanism and the sliding sleeve gripping mechanism is a direct current brushless motor, and the speed reducer is a planetary gear speed reducer.
The rotating motor in the sliding sleeve rotating mechanism is connected with the speed reducer, an output shaft of the speed reducer is connected with one end of the coupler, the other end of the coupler is connected with one end of the sliding ring shaft, the other end of the sliding ring shaft is connected with one end of the third connector, the inner wall of the other end of the third connector is connected with the thrust seat fixing sleeve in the sliding sleeve clamping mechanism, and the outer wall of the third connector is connected with one end of the driving arm outer sleeve in the sliding sleeve clamping mechanism;
a transmission shaft in the sliding sleeve gripping mechanism extends into an inner cavity of the third connector, and an O-shaped sealing ring is arranged at the contact position of the transmission shaft and the third connector;
the rotating motor drives the operation claw in the sliding sleeve clamping mechanism to rotate through the third connector.
The sliding sleeve rotating mechanism comprises a rotating motor sealing sleeve, a driving arm outer sleeve in the sleeve clamping mechanism is connected with one end of the rotating motor sealing sleeve through a second connector, the other end of the rotating motor sealing sleeve is connected with one end of a fourth connector, and the other end of the fourth connector is connected with a limiting centering sleeve;
the middle part of the inner cavity of the fourth connector is a small-aperture section, and the two ends of the inner cavity of the fourth connector are large-aperture sections; the inner wall of the small-aperture section is in contact with the outer wall of the third connector, and an O-shaped sealing ring is arranged between the inner wall of the small-aperture section and the outer wall of the third connector;
rolling bearings are respectively arranged in the large-aperture sections at the two ends;
an outer bearing ring, a bearing and a backing ring are sequentially arranged between the inner wall of the limiting and centering sleeve and the outer wall of the third connector;
and an O-shaped sealing ring is arranged at the contact position of the rotary motor sealing sleeve and the fourth connector.
Compared with the prior art, the invention has the beneficial effects that:
(1) number of arbitrary segments
Because the sliding sleeve adopts the sliding sleeve that presets of full latus rectum, consequently can realize arbitrary grade segmentation number, satisfy the needs of the large-scale fracture net fracturing of shale gas.
(2) The well completion cost is low
The electric control sliding sleeve opening and closing tool can be used for multiple times, the preset sliding sleeve structure is simple, and the procedures of perforation, plug drilling and the like are not needed, so that the well completion cost is greatly reduced;
(3) intuitive and reliable sliding sleeve switch
Because the well completion electric control sliding sleeve opening and closing tool is put in by the cable, the self has the functions of positioning, current detection and displacement detection, and the state of the sliding sleeve can be visually seen, so that the reliability of the sliding sleeve operation can be ensured.
(4) High pressure resistance
The sliding sleeve adopts mechanical seal, and does not need special materials like a composite bridge plug or a pitching sliding sleeve technology, so that the sealing is reliable, and the pressure bearing capacity is high.
(5) Can simultaneously meet the requirements of multistage staged fracturing and staged water control
The sliding sleeve can be operated for many times by adopting an electric control sliding sleeve opening and closing tool, so that the corresponding sliding sleeve can be independently closed when the local water is flooded, and other layers are continuously produced, thereby realizing the water control function.
Drawings
FIG. 1 is a schematic view of the structure of a pipe string according to the present invention
FIG. 2 is a schematic view of the structure of the switch sliding sleeve of the present invention
FIG. 3 is a schematic representation of a staged completion method according to the present invention
FIG. 4 is a schematic view of the structure of the downhole electrical control sliding sleeve switch tool of the present invention
FIG. 5 is an enlarged view of portion A in FIG. 4
FIG. 6 is an enlarged view of portion B in FIG. 4
FIG. 7 is an enlarged view of portion C in FIG. 4
FIG. 8 is a left side view of the downhole electrically controlled sliding sleeve switch tool of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
aiming at staged fracturing and staged water control of a horizontal well, an electric control sliding sleeve switch tool, a casing sliding sleeve tool and other matched staged well completion process technologies are developed, the technology is realized by adopting the electric control sliding sleeve switch tool to open and close a preset underground sliding sleeve step by step, a measurement and control system controls the positioning and the action of a pumping switch tool on the ground, and the preset sliding sleeve is operated; the electric control switch tool adopts a modular design and is divided into a transmission system, a positioning system, an operation system and the like, and the functions of underground movement, positioning and sliding sleeve operation of the electric control sliding sleeve switch tool are respectively realized.
As shown in fig. 1, the preset pipe column system (the preset pipe column refers to that a plurality of preset sliding sleeves are connected by a sleeve and are put into a well according to preset positions, and a well completion robot operates in the later stage) is composed of a plurality of preset sliding sleeves 1-2 (namely, switching sliding sleeves) and positioning mark short sections 1-1 which are connected by the sleeve, the sliding sleeves and the short sections are directly connected, the length of the short sections is determined, so that the distance between a mark groove and a sliding sleeve inner sleeve is ensured to be equal to the distance between a positioning detection device of a robot and a sliding sleeve operating claw, and thus when the positioning detection device detects the mark groove, the operating claw just corresponds to the sliding sleeve inner sleeve, so that the operating claw of the robot can accurately bite the inner sleeve of. The positioning mark short section is a sleeve short section with a groove axially carved, and helps an underground switch tool to identify the accurate position of a switch sliding sleeve; the preset sliding sleeve is opened through the switch tool, so that the sliding sleeve can be communicated with the stratum to perform fracturing, the sliding sleeve can be isolated from the stratum to perform water control after being closed, and repeated fracturing can be performed after the sliding sleeve is opened, so that the operation can be analogized.
The switch of presetting the sliding sleeve is operated and controlled by automatically controlled sliding sleeve switch instrument, and wherein first order sliding sleeve is opened for the first time and is adopted the mode of suppressing pressure, can reduce once and play the operation of automatically controlled sliding sleeve switch instrument, also makes things convenient for the automatically controlled sliding sleeve switch instrument in later stage to carry out the pumping.
The underground sliding sleeve opening and closing system mainly comprises an acoustic wave positioner 1-3 and a sliding sleeve operation tool 1-4, wherein acoustic wave positioning can accurately identify the grooved casing pipe nipple and the opening and closing state of the sliding sleeve, the acoustic wave positioner sends out acoustic waves by using an acoustic wave generator (a sonar probe), the acoustic waves are received after being reflected by the inner wall of the casing pipe, and the distance between the probe and the well wall is calculated through the time difference between the sending and the receiving and the speed of the acoustic waves in a medium. The acoustic locator is directly connected with the electric control sliding sleeve switch tool, and the distance between the acoustic locator and the electric control sliding sleeve switch tool is equal to the distance between the marking slot (namely the locating marking short section 1-11-1 in figure 1) and the preset sliding sleeve 1-2, so that the electric control sliding sleeve switch tool can be ensured to be just corresponding to the position of the sliding sleeve when the acoustic locator detects the marking slot, and accurate positioning can be ensured. The switch system of the sliding sleeve operation tool can also be added with auxiliary tools such as a recyclable leather cup and a pumping centralizer. The recyclable leather cup is stretched and tightly attached to the sleeve when going down into the well, so that an electric control sliding sleeve switch tool can be conveniently and quickly put in by pumping, the leather cup is controlled to retract on the ground after being in place, and a cable can be conveniently lifted up to put out the electric control sliding sleeve switch tool; the sound wave positioner scans the inner wall of the casing pipe, and after finding the positioning short section, the sound wave positioner indicates that the electric control sliding sleeve switch tool is accurately positioned; the sliding sleeve operation tool controls the opening and closing of the sliding sleeve, so that the functions of step-by-step fracturing and water control are realized; the centralizer guarantees that automatically controlled sliding sleeve switch instrument is placed in the middle in the sleeve pipe, avoids automatically controlled sliding sleeve switch instrument and sleeve pipe to collide with, reduces automatically controlled sliding sleeve switch instrument resistance of pulling up simultaneously.
The ground control system mainly comprises a high-voltage direct-current power supply system, a cable winch system and a communication and control system. The high-voltage direct-current power supply system provides power for the underground electric control sliding sleeve opening and closing tool, the cable winch system provides power for cable pulling, and the communication and control system collects signals of the underground electric control sliding sleeve opening and closing tool and controls the action of the electric control sliding sleeve opening and closing tool at the same time.
The segmented well completion process of the electric control sliding sleeve opening and closing tool comprises the following steps:
(1) running preset pipe column
During well completion, a plurality of preset sliding sleeves are installed in the casing string, a preset position is set, and the packer is well-cemented or set under pressure. Wherein first level sliding sleeve adopts the first pressure-out to open, the later stage adopts the sliding sleeve switch system switch mode in the pit, all the other sliding sleeves at all levels adopt the sliding sleeve switch system switch mode in the pit, and the sliding sleeves at all levels all are all supporting respectively to have the positioning mark groove (be the positioning mark groove on the positioning mark nipple joint), make things convenient for the positioning of later stage sliding sleeve switch system in the pit to use.
(2) First stage fracturing
And (4) suppressing pressure in the sleeve, opening the first-stage sliding sleeve (pressure-suppressing sliding sleeve), and fracturing. After fracturing is finished, the pressure-building sliding sleeve piston keeps an opening state under static pressure.
(3) Go into underground sliding sleeve switching system down, close preceding one-level sliding sleeve, open back one-level sliding sleeve, fracture:
after the first-stage fracturing is completed, the underground sliding sleeve switch system is pumped into the casing from the inside of the casing, after the electric control sliding sleeve switch tool is roughly judged to be under the first-stage sliding sleeve through the cable length, the electric control sliding sleeve switch tool is operated on the ground to retract a pumping leather cup, then the electric control sliding sleeve switch tool can be slowly lifted, the electric control sliding sleeve switch tool is judged to be in place by utilizing a sound wave positioner in the underground sliding sleeve switch system to stop lifting, then the sliding sleeve operation tool is operated to respectively open two operation claws to respectively bite the inner walls of the casing and the sliding sleeve, and then the operation claws are rotated to close the first-stage sliding sleeve.
Then the operating claws are retracted, the sliding sleeve is lifted to the next stage of sliding sleeve, the lifting of the underground sliding sleeve switch system is stopped after positioning, then the two operating claws are operated to open to respectively bite the sleeve and the inner wall of the sliding sleeve, and then the operating claws are rotated to open the next stage of sliding sleeve.
After the sliding sleeve is opened, the operating claw is retracted, the cable is lifted up, the underground sliding sleeve opening and closing system is lifted out of the ground, and the corresponding fracturing channel is opened, so that fracturing can be performed from the inside of the casing pipe;
(4) sequentially closing the front-stage sliding sleeve, opening the rear-stage sliding sleeve and fracturing;
and (4) repeating the step (3), closing the front-stage sliding sleeve in sequence, opening the rear-stage sliding sleeve, and fracturing each stage.
(5) Put into production
And after fracturing is finished, putting the fracturing fluid into an underground sliding sleeve switching system, and completely opening all stages of preset sliding sleeves to put into production.
(6) Water control
When a certain fracturing section is discharged at the later stage, the corresponding sliding sleeve can be closed by a downhole sliding sleeve opening and closing system, and other sections are continuously produced, so that the segmented well completion function is realized.
The whole process is shown in fig. 3.
The core kit for segmented water control well completion comprises the following components:
(1) the switch sliding sleeve is shown in figure 2 and has the following specific structure
1) Comprises an upper joint 201, a sealing ring 202, an outer sleeve 203, a sealing inner sleeve 204, a sliding sleeve screw 205, an anti-rotation pin 207 and a lower joint 208;
2) the outer sleeve 203 is provided with fracturing fluid circulation holes, and 6-10 fracturing fluid circulation holes are circumferentially and uniformly distributed.
3) Two groups of O-shaped sealing rings 202 are designed at two ends of the outer surface of the inner sealing sleeve 204, and the axial distance between the two groups of sealing rings is 20-40mm larger than the length of the fluid circulation hole on the outer sleeve so as to ensure that the circulation hole is completely closed when closed.
4) The lower joint 208 is connected with the outer sleeve 203 through threads, and the joint is sealed by an O-shaped sealing ring. The screw rod is a cylindrical structure and is positioned in the inner cavity of the sealing inner sleeve, and the screw rod is in clearance fit with the sealing inner sleeve. The screw rod drives the sealing inner sleeve to move axially when rotating, so that the circulation hole is closed or opened, and the circulation hole is safely sealed by the sealing sleeve.
The working principle is that a well completion robot bites the inner wall of a sliding sleeve screw 205 to rotate, (the screw 205 is limited by two end steps and cannot axially move, and only can rotate forwards and backwards.) the lower internal thread of the sealing inner sleeve 204 is meshed with the external thread of the screw 205, and because the axial guide groove of the sealing inner sleeve 204 is limited by an anti-rotation pin 207 and cannot rotate, the sealing inner sleeve 204 can only axially move, so that a circulation hole of the sliding sleeve is opened or closed.
The electric control sliding sleeve opening and closing tool is a more complex tool in the well completion robot, is also a core component of the well completion robot, is an actuating mechanism of the well completion robot, is directly butted with a preset sliding sleeve, and operates the opening and closing of the sliding sleeve.
The electric control sliding sleeve opening and closing tool is composed of two operating claws and a rotating mechanism, the two operating claws respectively bite the inner wall of the sleeve and the inner wall of the sliding sleeve after being opened, and then the rotating mechanism rotates to drive a screw nut mechanism of the sliding sleeve to rotate so as to open or close the sliding sleeve.
The action of each operating claw is controlled by a direct current brushless motor, after the motor is electrified, the speed is reduced to about 10-1/min through a planetary gear reducer, a lead screw is driven to rotate, the axial motion of the lead screw is converted into the axial motion of the lead screw through a lead screw nut pair, and the operating claws are crank slider mechanisms and convert the axial motion into the radial extension of the operating claws.
The electric control sliding sleeve switch system 1-4 is shown in fig. 4-8, and specifically comprises the following components:
1) a prefabricated sliding sleeve switch tool for a horizontal well or a branch well, which can be conveyed by a cable or hydraulically pumped to a preset position; the actuating mechanism is used for opening and closing the sliding sleeve, is directly butted with the preset sliding sleeve and operates the opening and closing of the sliding sleeve; it includes: the device comprises a plug 1, an O-shaped sealing ring 2, a motor and speed reducer 3, a motor sealing sleeve 4, a motor fixing sleeve 5, a screw 6, a coupler 7, a through hole type sliding ring 8, a sliding ring central shaft 9, a flat key fixing sleeve 10, a first bearing compression sleeve 11, a clamping nut 12, a first sleeve 13, a rolling bearing 14, an O-shaped sealing ring 15, a transmission shaft 16, a first connector 17, a compression spring 18, a transmission nut 19, a supporting arm thrust seat 20, a transmission nut end cover 21, a pin 22, a first driving arm 23, a pin 24, a second driving arm 25, a thrust seat 26, a driving arm outer sleeve 27, a second connector 28, a cap type sliding ring 29, a rotating motor sealing sleeve 30, a clamping nut 31, a second bearing compression sleeve 32, a second sleeve 33, a third connector 34, a rolling bearing 35, an O-shaped sealing ring 36, a fourth connector 37, a rolling bearing 38, a limiting centralizer 39, a bearing, Bearing 41, backing ring 42.
2) The sliding sleeve opening and closing tool is composed of two operating claws and a rotating mechanism, the two operating claws respectively bite the inner wall of the sleeve and the inner wall of the sliding sleeve after being opened, and then the rotating mechanism rotates to drive a screw nut mechanism of the sliding sleeve to rotate so as to open or close the sliding sleeve.
3) The tool adopts a through hole type slip ring 8 and a transmission shaft 16 with a central hole and a side hole, and the control cable can pass through the tool through the design, so that one cable can control the whole set of tool. The three shafts are all provided with a hole in the center so that the cable can pass through to supply power and transmit signals to the next stage. Because the three transmission shafts all need to rotate, the fixed cable and the rotating cable are connected by the through-hole type slip ring and the cap type slip ring, so that the cable is prevented from being damaged during rotation, and signals and power supply can be transmitted.
4) The two groups of supporting arms of the tool can extend out and bite the inner wall of the casing or the sliding sleeve, and can be retracted into the outer protective sleeve of the tool when the tool needs to be lifted and lowered, so that the tool is favorably lifted and lowered.
5) The action of each operating claw is controlled by a direct current brushless motor, after the motor is electrified, the speed is reduced to about 10-1/min through a planetary gear reducer, a lead screw is driven to rotate, the axial motion of the lead screw is converted into the axial motion of the lead screw through a lead screw nut pair, the operating claws are crank slider mechanisms, and the axial motion is converted into the radial extension of the operating claws, namely the operating claws extend out of an outer sleeve of a driving arm or retract into an inner cavity of the outer sleeve of the driving arm.
6) A sleeve biting mechanism: the sliding sleeve type switch tool mainly comprises a motor, a speed reducer 3, a coupler 7, a sliding ring 8, a bearing 14, a transmission shaft 16, a transmission nut 19, a supporting arm thrust seat 20, a transmission nut end cover 21 and the like, wherein the transmission shaft 16 is driven to rotate through forward rotation and reverse rotation of the motor, the left end of the transmission nut 19 can only axially move in a groove in the first connecting head 17, and due to the limiting effect, the transmission nut 19 pushes the supporting arm thrust seat 20 to open a first driving arm 23 and a second driving arm 25 when the motor rotates forwards, a sleeve is gripped, and one end of a sleeve mechanism is fixedly gripped to serve as a supporting point of the sliding sleeve switch tool.
7) Gripping the sliding sleeve and rotating the operating mechanism:
the mechanism also has the functions of opening the supporting arm and biting the inner wall of the sliding sleeve, and the action mechanism of the mechanism is similar to that of a biting sleeve mechanism and is mainly controlled by a motor at the rightmost side.
In addition, the mechanism also has a rotation action, namely the mechanism is driven to rotate by the rotation of the intermediate motor so as to open or close the sliding sleeve, and the action principle is as follows: after the sliding sleeve is bitten, the middle motor rotates to drive the third connector 34 and the mechanism on the right side of the connector to rotate, and the lower support arm is bitten by the sliding sleeve to drive the inner sliding sleeve to rotate, so that the sliding sleeve is opened and closed. The supporting arm mainly comprises a supporting arm thrust seat 20, a transmission nut end cover 21, a first driving arm 23, a second driving arm 25 and a thrust seat 26, and is provided with a compression spring 18 so as to reduce the rigidity of the supporting arm when the supporting arm bites the sleeve. After the transmission nut converts the rotation of the screw rod into axial motion, the operation claw is pushed by the spring to move, so that the torque is prevented from being suddenly increased, and the motor is burnt due to overlarge current.
The two groups of supporting arms can be retracted into the outer protective sleeve of the tool when the switch tool needs to be lifted and lowered, and the switch tool is lifted and lowered conveniently. The invention can realize the segmentation of any section of the horizontal well or the branch well by matching with the matched prefabricated sliding sleeve opening and closing tool, the sliding sleeve opening and closing tool is conveyed to the underground through a cable or a pump, the construction is rapid and continuous, the opening and closing can be repeated, and the invention has the functions of staged fracturing and water control.
In conclusion, the well completion method and the well completion pipe string are used for staged well completion of the horizontal well, infinite staged well completion can be realized, the repeated switch can meet the requirement of large-discharge fracturing construction with the full diameter of the casing, and the well completion method and the well completion pipe string have staged fracturing, water control and repeating functions; the temperature and pressure resistance is high; the completion cost is low.
The above-described embodiment is only one embodiment of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be easily made based on the application and principle of the present invention disclosed in the present application, and the present invention is not limited to the method described in the above-described embodiment of the present invention, so that the above-described embodiment is only preferred, and not restrictive.
Claims (9)
1. A downhole sliding sleeve switch system for opening and closing a switch sliding sleeve in a string of tubulars that implement a staged fracturing and water control completion method, the staged fracturing and water control completion method comprising:
(1) putting a pipe column: the pipe column is lowered to a preset position, and the packer is well-fixed or set under pressure;
(2) first-stage fracturing: the pressure is suppressed in the sleeve, the first-stage switch sliding sleeve is opened for fracturing, and after fracturing is finished, the pressure is suppressed to enable the switch sliding sleeve to be kept in an open state under static pressure;
(3) a downhole sliding sleeve switch system is put in, the front stage sliding sleeve is closed, the rear stage sliding sleeve is opened, and fracturing is carried out;
(4) repeating the step (3) until fracturing of each stage is completed;
(5) putting into production: a downhole sliding sleeve switch system is put in, and switch sliding sleeves at all stages are opened to carry out production;
(6) controlling water: after a certain fracturing section is discharged at the later stage, the corresponding switch sliding sleeve is closed by a downhole sliding sleeve switch system, and other sections are continuously produced, so that the segmented well completion function is realized;
the pipe column comprises a plurality of groups of switch sliding sleeves and positioning mark short sections which are connected by a sleeve, and the switch sliding sleeves and the positioning mark short sections in each group are directly connected;
a mark groove is formed in the positioning mark short section;
the method is characterized in that: the underground sliding sleeve switching system comprises a sound wave positioner and an electric control sliding sleeve switching tool, wherein the sound wave positioner is directly connected with the electric control sliding sleeve switching tool, and the distance between the sound wave positioner and the electric control sliding sleeve switching tool is equal to the distance between a mark groove on the positioning mark short section and the switching sliding sleeve;
the electric control sliding sleeve opening and closing tool comprises a sleeve clamping mechanism, a sliding sleeve rotating mechanism and a sliding sleeve clamping mechanism which are connected in sequence;
the sleeve clamping mechanism and the sliding sleeve clamping mechanism are arranged in a mirror symmetry mode and respectively comprise a power device, a screw-nut pair and an operating claw; the screw rod nut pair drives the operating claw to open or retract;
sliding sleeve rotary mechanism includes rotating electrical machines and third connector, rotating electrical machines passes through the third connector drive the operating claw rotation in the tight mechanism is stung to the sliding sleeve.
2. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 1, wherein: the power device of the sleeve pipe gripping mechanism and the sliding sleeve gripping mechanism comprises: the motor, the reducer and the connecting mechanism;
the screw-nut pair comprises: the transmission shaft, the transmission nut and the first connecting head; the transmission shaft is provided with a screw thread to form a lead screw;
the motor is connected with the speed reducer, and an output shaft of the speed reducer is connected with one end of the transmission shaft through a connecting mechanism; the middle part of the inner cavity of the first connecting head is a small-aperture section, the two ends of the inner cavity of the first connecting head are large-aperture sections, the inner wall of the small-aperture section is in contact with the outer wall of the transmission shaft, and an O-shaped sealing ring is arranged between the small-aperture section and the transmission shaft;
a rolling bearing is arranged in the large-aperture section facing one side of the motor, the transmission nut is arranged in the large-aperture section on the other side, a groove is formed in the inner wall of the large-aperture section, a thread is arranged on the outer wall of the transmission shaft at the position, and when the transmission shaft rotates forwards and backwards, the transmission nut can axially reciprocate in the groove;
the operating claw comprises a driving arm outer sleeve, and a supporting arm thrust seat, a crank slider mechanism and a thrust seat fixing sleeve which are arranged in an inner cavity of the driving arm outer sleeve;
an axial hole is formed in the outer sleeve of the driving arm;
the crank slider mechanism comprises a first driving arm and a second driving arm, one end of the first driving arm is connected with one end of the supporting arm thrust seat through a pin, the other end of the first driving arm is connected with one end of the second driving arm through a pin, and the other end of the second driving arm is connected with the thrust seat fixing sleeve through a pin;
the end face of the other end of the support arm thrust seat is connected with the end face of the transmission nut through a compression spring, and when the transmission nut moves along the axial direction, the support arm thrust seat is driven to move along the axial direction to push the first transmission arm and the second transmission arm to radially expand or retract;
the connecting mechanism comprises a coupler, a slip ring shaft, a slip ring and a flat key fixing sleeve; an output shaft of the speed reducer is connected with one end of a sliding ring shaft through a coupler, the other end of the sliding ring shaft is connected with one end of a transmission shaft through the flat key fixing sleeve, and the sliding ring is sleeved on the sliding ring shaft;
the sleeve clamping mechanism and the sliding sleeve clamping mechanism both comprise a plug, a motor sealing sleeve and a motor fixing sleeve; the plug is connected with one end of the motor sealing sleeve, and the other end of the motor sealing sleeve is connected with one end of the first connecting head;
the motor fixing sleeve is arranged in an inner cavity of the motor sealing sleeve, and the power device is arranged in the motor fixing sleeve;
the slip ring is a through hole type slip ring, and the transmission shaft is provided with a central hole and a side hole;
the motor in the sleeve pipe gripping mechanism and the sliding sleeve gripping mechanism is a direct current brushless motor, and the speed reducer is a planetary gear speed reducer.
3. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 2, wherein: the rotating motor in the sliding sleeve rotating mechanism is connected with the speed reducer, an output shaft of the speed reducer is connected with one end of the coupler, the other end of the coupler is connected with one end of the sliding ring shaft, the other end of the sliding ring shaft is connected with one end of the third connector, the inner wall of the other end of the third connector is connected with the thrust seat fixing sleeve in the sliding sleeve clamping mechanism, and the outer wall of the third connector is connected with one end of the driving arm outer sleeve in the sliding sleeve clamping mechanism;
a transmission shaft in the sliding sleeve gripping mechanism extends into an inner cavity of the third connector, and an O-shaped sealing ring is arranged at the contact position of the transmission shaft and the third connector;
the rotating motor drives the operation claw in the sliding sleeve clamping mechanism to rotate through the third connector.
4. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 3, wherein: the sliding sleeve rotating mechanism comprises a rotating motor sealing sleeve, a driving arm outer sleeve in the sleeve clamping mechanism is connected with one end of the rotating motor sealing sleeve through a second connector, the other end of the rotating motor sealing sleeve is connected with one end of a fourth connector, and the other end of the fourth connector is connected with a limiting centering sleeve;
the middle part of the inner cavity of the fourth connector is a small-aperture section, and the two ends of the inner cavity of the fourth connector are large-aperture sections; the inner wall of the small-aperture section is in contact with the outer wall of the third connector, and an O-shaped sealing ring is arranged between the inner wall of the small-aperture section and the outer wall of the third connector;
rolling bearings are respectively arranged in the large-aperture sections at the two ends;
an outer bearing ring, a bearing and a backing ring are sequentially arranged between the inner wall of the limiting and centering sleeve and the outer wall of the third connector;
and an O-shaped sealing ring is arranged at the contact position of the rotary motor sealing sleeve and the fourth connector.
5. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 4, wherein: the step (3) is realized by the following steps:
after the previous stage of fracturing is completed, a downhole sliding sleeve switch system is lowered into the casing, after the downhole sliding sleeve switch system is roughly judged to pass through a previous stage switch sliding sleeve through the cable length, the downhole sliding sleeve switch system is operated to retract a pumping leather cup, then the downhole sliding sleeve switch system is lifted upwards, the downhole sliding sleeve switch system is judged to be in place by using a sound wave positioner in the downhole sliding sleeve switch system, the lifting is stopped, then the downhole sliding sleeve switch system is operated, two operating claws are opened to respectively bite the casing and the inner wall of the sliding sleeve, and then the operating claws are rotated to close the previous stage switch sliding sleeve;
then, the underground sliding sleeve opening and closing system is lifted up to the position of the next-stage switch sliding sleeve, the underground sliding sleeve opening and closing system is stopped being lifted up after the positioning, then the underground sliding sleeve opening and closing system is operated, the two operation claws are opened to respectively bite the sleeve and the inner wall of the sliding sleeve, and then the operation claws are rotated to open the next-stage switch sliding sleeve;
and retracting the operating claw, lifting the underground sliding sleeve switch system out of the ground, and fracturing from the inside of the casing.
6. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 5, wherein:
the switch sliding sleeve comprises an upper joint, an outer sleeve and a lower joint which are connected in sequence;
a sealing inner sleeve is arranged in the inner cavity of the outer sleeve, and a sliding sleeve screw rod is arranged in the inner cavity of the sealing inner sleeve;
a fracturing fluid circulation hole is formed in the wall of the outer sleeve;
the sliding sleeve screw rod is of a cylindrical structure, and two ends of the sliding sleeve screw rod are respectively propped against a step at the lower part of the upper joint and a step at the upper part of the lower joint; the lower part of the sliding sleeve screw rod is provided with an external thread;
the sliding sleeve lead screw is in clearance fit with the sealing inner sleeve; the lower part of the sealing inner sleeve is provided with an internal thread which is meshed with an external thread on a sliding sleeve screw rod;
the lower part of the sealing inner sleeve is provided with a guide groove which is parallel to the axial direction of the sealing inner sleeve;
an anti-rotation pin is arranged at the lower part of the outer sleeve, and the protruding part of the anti-rotation pin is positioned in the guide groove;
the sliding sleeve lead screw drives the sealing inner sleeve to move axially when rotating, so that the opening or closing of the circulation hole is realized, and the sliding sleeve lead screw is provided with holes which are uniformly distributed in the circumferential direction;
the outer sleeve is provided with 6-10 fracturing fluid circulation holes which are uniformly distributed in the circumferential direction.
7. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 6, wherein: the fracturing fluid circulation hole is a long round hole, and the length direction of the fracturing fluid circulation hole is parallel to the axial direction of the outer sleeve.
8. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 7, wherein: two groups of O-shaped sealing rings are arranged at two ends of the outer surface of the inner sealing sleeve, and when the sliding sleeve is closed, the two groups of O-shaped sealing rings are respectively positioned above and below the fracturing fluid circulation hole on the outer sleeve;
the axial distance between the two groups of O-shaped sealing rings is 20-40mm longer than the length of the fracturing fluid through hole on the outer sleeve.
9. The downhole sliding sleeve opening and closing system for opening and closing the opening and closing sliding sleeve in a string of tubulars for staged fracturing and water control completion methods according to claim 8, wherein: the lower end of the upper joint is inserted into an inner cavity of the upper part of the outer sleeve and is connected with the upper part of the outer sleeve through threads, and an O-shaped sealing ring is arranged at the joint of the upper joint and the outer sleeve;
the lower part of the outer sleeve is inserted into the inner cavity of the lower joint and is in threaded connection with the upper part of the lower joint, and an O-shaped sealing ring is arranged at the joint of the lower joint and the lower joint.
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| CN201710580590.3A CN109267982B (en) | 2017-07-17 | 2017-07-17 | Staged fracturing and water control well completion method, tubular column and underground sliding sleeve switch system |
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| CN201710580590.3A CN109267982B (en) | 2017-07-17 | 2017-07-17 | Staged fracturing and water control well completion method, tubular column and underground sliding sleeve switch system |
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| CN109267982B true CN109267982B (en) | 2021-04-02 |
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| CN110454129B (en) * | 2019-08-08 | 2022-03-01 | 中国石油天然气股份有限公司 | Gas well separate-layer fracturing and water control integrated process pipe column |
| CN111577204B (en) * | 2020-04-14 | 2022-10-21 | 成都众智诚成石油科技有限公司 | Underground cascade sliding sleeve system |
| CN111911126B (en) * | 2020-09-07 | 2022-11-22 | 中国石油天然气集团有限公司 | Setting bridge plug for repeated fracturing and repeated fracturing construction method of oil and gas field well |
| CN114427422B (en) * | 2020-09-25 | 2024-02-02 | 中国石油化工股份有限公司 | Multistage fracturing and intelligent well completion integrated tubular column and method |
| CN113027375B (en) * | 2021-03-11 | 2021-09-24 | 大庆市天德忠石油科技有限公司 | Combined tool matched with oilfield water plugging process |
| CN115370338B (en) * | 2021-05-20 | 2024-10-22 | 中石化石油工程技术服务有限公司 | Staged fracturing operation method for horizontal well |
| CN113279726B (en) * | 2021-06-04 | 2021-12-14 | 西南石油大学 | Underground intelligent electric control switch sliding sleeve |
| CN115030687A (en) * | 2022-07-03 | 2022-09-09 | 东北石油大学 | Underground multistage fracturing electric control sliding sleeve |
| CN115263263B (en) * | 2022-07-27 | 2024-05-14 | 西安航天化学动力有限公司 | Controllable shock wave fracturing device and method |
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| US4667753A (en) * | 1982-12-22 | 1987-05-26 | Standard Oil Company | Core retainer for sidewall core tools |
| CN103883300A (en) * | 2014-03-25 | 2014-06-25 | 中国石油集团渤海钻探工程有限公司 | Multistage fracturing and exploitation control method |
| CN204457619U (en) * | 2014-12-25 | 2015-07-08 | 中国石油化工股份有限公司 | Rotary full-bore fracturing switch |
| CN105822251B (en) * | 2016-05-06 | 2021-07-30 | 西南石油大学 | A motor-driven extrusion type downhole annular blowout preventer and its communication method |
| CN105971559A (en) * | 2016-06-22 | 2016-09-28 | 中国石油大学(华东) | Horizontal well staged fracturing sliding sleeve opening-closing tool |
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