CN110872944B - Fracturing string and horizontal well staged repeated fracturing operation method - Google Patents
Fracturing string and horizontal well staged repeated fracturing operation method Download PDFInfo
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- CN110872944B CN110872944B CN201811026252.6A CN201811026252A CN110872944B CN 110872944 B CN110872944 B CN 110872944B CN 201811026252 A CN201811026252 A CN 201811026252A CN 110872944 B CN110872944 B CN 110872944B
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000010276 construction Methods 0.000 claims abstract description 22
- 238000006073 displacement reaction Methods 0.000 claims abstract description 9
- 239000012530 fluid Substances 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 30
- 239000007788 liquid Substances 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 238000011010 flushing procedure Methods 0.000 claims description 5
- 239000002195 soluble material Substances 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000004576 sand Substances 0.000 abstract description 4
- 238000009933 burial Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000012856 packing Methods 0.000 description 3
- 230000002572 peristaltic effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
Classifications
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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
- 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
-
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/01—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for anchoring the tools or the like
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
本发明提供了一种压裂管柱和水平井分段重复压裂作业方法。其中，压裂管柱包括：油管，分多个管段，油管作为基管用于和管柱各工具进行螺纹连接，并提供压裂供液通道，且贯穿于水平井的套管内；悬挂器，悬挂器设置在油管上，以使压裂管柱整体固定在套管内，悬挂器与套管通过卡瓦实现固定约束的建立和解除；封隔器，封隔器为多个，且多个封隔器通过螺纹连接在在油管上；丢手工具，油管包括顺次连接的多个管段，且设置有悬挂器的管段通过丢手工具与相邻的管段连接，且丢手工具位于悬挂器的上方。本发明解决了现有技术中的压裂施工排量受限、压裂管柱易砂埋、打捞困难的问题。
The present invention provides a fracturing string and a method for repeated fracturing operations in a horizontal well. The fracturing string includes: an oil pipe, which is divided into a plurality of pipe sections. The oil pipe is used as a base pipe for threaded connection with various tools of the pipe section, and provides a fracturing fluid supply channel, and runs through the casing of the horizontal well; a hanger, which is arranged on the oil pipe so that the fracturing string is fixed in the casing as a whole, and the hanger and the casing are connected to each other through slips to establish and release fixed constraints; a packer, which is provided with a plurality of packers, and the plurality of packers are connected to the oil pipe through threads; a release tool, the oil pipe includes a plurality of pipe sections connected in sequence, and the pipe section provided with the hanger is connected to the adjacent pipe section through a release tool, and the release tool is located above the hanger. The present invention solves the problems in the prior art of limited displacement of fracturing construction, easy sand burial of the fracturing string, and difficulty in salvage.
Description
Technical Field
The invention relates to the technical field of oil and gas field fracturing, in particular to a fracturing string and a horizontal well segment repeated fracturing operation method.
Background
The existing horizontal well casing completion subsection repeated fracturing string technology mainly comprises the following three steps:
the double-sealing single-clamp dragging fracturing technology is that an oil pipe is provided with a double packer and a sliding sleeve to enter a well, the packer is set to seal a target interval, fracturing is implemented through the oil pipe, and a lifting pipe column is used for replacing a layer, so that sectional transformation is realized. Because the fracturing construction is required to be carried out from the oil pipe, the general construction displacement is smaller, and the larger the friction resistance in the pipe is along with the increase of the well depth, the actual construction displacement cannot meet the fracturing design requirement, so the fracturing construction method is not suitable for the transformation of the deep well horizontal well, and meanwhile, after the single-stage fracturing of part of the horizontal well is completed, the pressure diffusion is slow, the waiting time is long, and the problems of low construction efficiency and long operation period are caused. If the wellhead non-well killing device is adopted for operation, the problems of complex operation flow and high cost exist.
The technology of the full-shaft chemical temporary plugging and hydraulic jet fracturing pipe column comprises the steps of implementing temporary plugging on the full-shaft by using a novel high-performance chemical temporary plugging agent, and then putting the full-shaft chemical temporary plugging agent into a hydraulic jet pipe column to carry out fixed-point fracturing transformation.
The expansion pipe secondary well completion and perforation fracturing string technology is that an oil pipe with expansion performance is firstly put in, and then the special tool is used for carrying out the expansion operation of the oil pipe, so that the oil pipe is clung to the original shaft wall to create a new shaft, the integrity of the shaft is restored, and perforation fracturing is adopted for well completion in the later period, so that the implementation is difficult due to high cost and high risk.
Therefore, the problems of limited discharge capacity, easy sand burying of a fracturing string and difficult taking out of the fracturing string in the prior art are known.
Disclosure of Invention
The invention mainly aims to provide a fracturing string and a horizontal well segmented repeated fracturing operation method, which are used for solving the problems that in the prior art, fracturing construction displacement is limited, the fracturing string is easy to sand-bury and difficult to take out.
In order to achieve the aim, according to one aspect of the invention, a fracturing string is provided, which comprises an oil pipe, a hanger, a packer and a releasing tool, wherein the oil pipe is divided into a plurality of pipe sections, the oil pipe is used as a base pipe for being connected with each tool of the string in a threaded mode, a fracturing fluid supply channel is provided and penetrates through a casing of a horizontal well, the hanger is arranged on the oil pipe, the fracturing string is integrally fixed in the casing, the hanger and the casing are used for achieving establishment and release of fixed constraint through slips, the packer is multiple and is connected to the oil pipe in a threaded mode, the releasing tool comprises a plurality of pipe sections connected in sequence, the pipe section provided with the hanger is connected with the adjacent pipe sections through the releasing tool, and the releasing tool is located above the hanger.
Further, the fracturing string further comprises a hydraulic safety joint, the pipe section provided with the hanger is connected with the adjacent pipe section through the hydraulic safety joint, and the hydraulic safety joint is located below the hanger.
Further, the oil pipe comprises a vertical pipe section and a horizontal pipe section which are connected in sequence, the hanger is positioned on the vertical pipe section, the horizontal pipe section comprises a plurality of sub-pipe sections which are connected in sequence, and the sub-pipe sections are connected through the ejector.
Further, a packer is provided between two adjacent injectors.
Further, at least one packer is provided on the horizontal pipe section.
Further, the number of the sub-pipe sections is greater than three, and the number of the ejectors is multiple and comprises at least one fracturing valve and at least one ball-throwing fracturing sliding sleeve.
Further, the number of the fracturing valves is one, and the fracturing valves are located at one end, far away from the vertical pipe section, of the horizontal pipe section relative to the ball-throwing fracturing sliding sleeve.
Further, the ball injection fracturing sliding sleeves are multiple, and the ball injection fracturing sliding sleeves are connected to the oil pipe through threads.
Further, the fracturing string further comprises a guide head, and one end, far away from the vertical pipe section, of the horizontal pipe section is provided with the guide head.
Further, the diameters of the different ejectors are different, and the diameters sequentially increase along the direction approaching the vertical pipe section.
Further, the packing element of the packer and/or the sealing ball that is thrown into the ball fracturing slide sleeve are made of soluble materials.
Further, the hanger is a slip-type casing hanger.
According to another aspect of the invention, the method for performing the staged repeated fracturing operation on the horizontal well of the oil-gas field by adopting the fracturing string comprises the steps of performing forward circulation well flushing operation, and performing fracturing operation after the fracturing string is lowered into a casing.
The fracturing operation method comprises the steps of carrying out fracturing operation, namely carrying out integral in-pipe pressurization treatment on the fracturing string to enable a packer of the fracturing string to be set, setting and fixing a hanger of the fracturing string on the inner wall of a casing when in-pipe pressure of the fracturing string is continuously increased, and lifting out a pipe section of an oil pipe of the fracturing string above the hanger.
Further, the pre-fracturing step may include the need to lift the release tool with the pipe section above the hanger when the hanger is connected to an adjacent pipe section by the release tool of the fracturing string.
Further, the fracturing operation process further comprises a staged fracturing step after the pre-fracturing step, wherein the staged fracturing step comprises the steps of progressively pitching and progressively pressurizing the fracturing string so that sand blasting holes of all ejectors of the fracturing string are sequentially opened along the direction close to the vertical pipe section, and liquid and/or gas ejected from the sand blasting holes flows into the stratum through the original perforation layer section of the casing.
The horizontal well staged repeated fracturing operation method further comprises a string salvaging and recycling operation after the fracturing operation is completed, wherein the salvaging and recycling operation comprises the steps of enabling a rubber sleeve of a packer of the fracturing string and a sealing ball in an ejector of the fracturing string to be dissolved in a manner of adding a dissolving agent into the fracturing string or self-dissolving, salvaging a hanger of the fracturing string, and salvaging an oil pipe of the fracturing string from a casing.
The method comprises the steps of installing a packer and a hanger of each fracturing string on the oil pipe, arranging an ejector between two adjacent sub-pipe sections, arranging a guide head on one end extending into the casing, and arranging the packer and the hanger of the fracturing string on the oil pipe.
Further, the pre-installation step further includes installing a hydraulic safety joint under the hanger to connect the hanger to its adjacent pipe segment.
Further, the pre-installing step further includes installing a release tool over the hanger to connect the hanger with its adjacent pipe segment.
By the technical scheme, the fracturing string comprises an oil pipe, a hanger and a packer, wherein the oil pipe is divided into a plurality of pipe sections, the oil pipe is used as a base pipe for being in threaded connection with each tool of the string, a fracturing fluid supply channel is provided and penetrates through a sleeve of a horizontal well, the hanger is arranged on the oil pipe, so that the fracturing string is integrally fixed in the sleeve, the hanger and the sleeve are fixedly restrained by slips, the packer is multiple and is in threaded connection with the oil pipe, the releasing tool comprises a plurality of pipe sections which are sequentially connected, the pipe section provided with the hanger is connected with the adjacent pipe section through the releasing tool, and the releasing tool is located above the hanger. The packer has the advantages that the integral salvaging and grading salvaging modes after the fracturing operation of the pipe column are finished are designed, the taking-out difficulty is reduced, the safety of the pipe column is improved, in addition, the hanger is arranged on the oil pipe, the whole pipe column can be fixed, the pipe column peristaltic motion in the fracturing process is effectively avoided, the hanger also has a sealing effect, the inside and the outside of the pipe column can be sealed to a certain extent, so that an annulus formed by the oil pipe and the sleeve is isolated from the external environment, the fracturing construction effect is prevented from being influenced, the packer has the effects of clamping, separating and sealing, a shaft can be divided into a plurality of relatively independent sealing spaces which are arranged at intervals, the grading fracturing of the fracturing device is realized, each sealing space is one level, the pipe section of the hanger can be arranged into multiple levels according to actual conditions, the pipe section of the hanger is connected with the adjacent pipe section through a hand tool, and the operation is convenient and quick, and the reliability is high.
The fracturing string mainly comprises a plurality of fracturing units, a hydraulic safety joint and a hanger, wherein the fracturing units are a packer and a ball-throwing fracturing sliding sleeve, and all the fracturing units are connected through oil pipes. After the fracturing construction is finished, the packer is automatically unsealed, and the fracturing string can be integrally salvaged or salvaged in a grading manner in the later period to recover the full diameter of the shaft.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 shows a schematic structural view of a fracturing string of an embodiment of the present invention;
FIG. 2 shows a schematic of the structure of a wellbore of the present application;
FIG. 3 shows a six-stage schematic of the fracturing device of FIG. 1;
FIG. 4 shows a schematic structural view of the fracturing device of FIG. 3 after setting;
FIG. 5 shows a schematic view of the release tool of FIG. 4 separated from the hanger;
FIG. 6 shows a schematic diagram of the first stage fracturing of the fracturing device of FIG. 5;
FIG. 7 shows a schematic diagram of the fracturing device of FIG. 5 performing a second stage of fracturing;
FIG. 8 shows a schematic structural view of the fracturing device of FIG. 5 performing third to sixth stage fracturing;
FIG. 9 shows a schematic view of the sealing ball of FIG. 5 after dissolution with a packer;
FIG. 10 shows a schematic view of the construction of FIG. 9 with the hanger removed;
FIG. 11 is a schematic view showing the construction of the tubing removed in FIG. 10;
FIG. 12 shows a schematic view of the section of tubing removed from FIG. 10, and
Fig. 13 shows another schematic view of the sectional removal of the tubing of fig. 10.
Wherein the above figures include the following reference numerals:
10. Oil pipe, 20 parts of casing, 30 parts of hanger, 40 parts of packer, 50 parts of releasing tool, 60 parts of hydraulic safety joint, 70 parts of injector, 71 parts of fracturing valve, 72 parts of ball-throwing fracturing sliding sleeve, 80 parts of guide head, 90 parts of sealing ball and 100 parts of salvaging pipe column.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless otherwise indicated.
In the present invention, unless otherwise indicated, the use of orientation terms such as "upper, lower, top, bottom" are generally with respect to the orientation shown in the drawings or with respect to the component itself in the vertical, vertical or gravitational direction, and likewise, for ease of understanding and description, "inner, outer" refer to inner, outer relative to the profile of the component itself, but such orientation terms are not intended to limit the invention.
The invention provides a fracturing string and a staged repeated fracturing operation method for a horizontal well, which aims to solve the problems that the construction displacement of a fracturing string is limited and salvage and recovery are difficult in the prior art. The staged repeated fracturing operation method of the horizontal well adopts the following fracturing tubular columns.
As shown in FIG. 1, the fracturing string comprises a tubing 10, a hanger 30 and a packer 40, wherein the tubing 10 is divided into a plurality of pipe sections, the tubing 10 is used as a base pipe for being connected with tools of the string in a threaded manner and provides a fracturing fluid supply channel, the fracturing string penetrates through a casing 20 of a horizontal well, the hanger 30 is arranged on the tubing 10, the fracturing string is integrally fixed in the casing 20, the hanger 30 and the casing 20 are fixedly restrained and released through slips, the packer 40 is multiple and the plurality of packers 40 are connected on the tubing 10 in a threaded manner, the releasing tool 50 is used for releasing the tubing 10, the pipe section provided with the hanger 30 is connected with the adjacent pipe section through the releasing tool 50, and the releasing tool 50 is positioned above the hanger 30. In addition, the hanger 30 is arranged on the oil pipe 10, can fix the whole pipe, effectively avoids pipe column creeping in the fracturing process, has a sealing function, can seal the inside and the outside of the pipe, can seal the annular space formed by the oil pipe 10 and the sleeve 20 to prevent the fracturing construction effect, has the functions of clamping, separating and sealing, can divide a shaft into a plurality of relatively independent sealing spaces arranged at intervals, and further realizes the staged fracturing of the fracturing pipe column, wherein each sealing space is one-stage and can be arranged into multiple stages according to actual conditions, the pipe section of the hanger 30 is connected with the adjacent pipe section through the releasing tool 50, and the operation is convenient and quick, and the reliability is high.
It should be noted that, the hanger 30 used herein includes three parts, namely, a connection structure, a fixing structure and a sealing structure, wherein the connection structure is used for being connected with the oil pipe 10, the fixing structure can be anchored with the casing 20 through slips so as to play a role in fixing the whole pipe column, the sealing structure is arranged below the fixing structure and plays a role in sealing the annular space of the pipe column and the casing 20, the hanger 30 can be separated from the casing 20 after being used, and the slips of the hanger 30 can be separated from the inner wall of the casing 20 in a lifting manner for retraction.
As shown in fig. 1, the fracturing string further comprises a hydraulic safety joint 60, and the pipe section provided with the hanger 30 is connected with the adjacent pipe section by the hydraulic safety joint 60, and the hydraulic safety joint 60 is located below the hanger 30. Thus, the pipe section of the hanger 30 is connected with the adjacent pipe section through the hydraulic safety joint 60, and the operation is convenient and quick, and the reliability is high.
As shown in fig. 1, the oil pipe 10 includes a vertical pipe section and a horizontal pipe section connected in series, the hanger 30 is located on the vertical pipe section, the horizontal pipe section includes a plurality of sub pipe sections connected in series, and the sub pipe sections are connected by an injector 70. The hanger 30 is positioned on the vertical tube section to provide a good securement and seal.
As shown in fig. 1, a packer 40 is provided between two adjacent injectors 70. The packer 40 has the function of sealing the annulus between the fracturing string and the casing 20, and can divide the horizontal pipe section into a plurality of sealing spaces arranged at intervals, so as to realize staged fracturing of the fracturing device, wherein each sealing space is one-stage, and can be arranged into multiple stages according to actual conditions, thus being beneficial to improving the working efficiency.
As shown in fig. 1, at least one packer 40 is provided on the horizontal pipe segment.
As shown in FIG. 1, the number of sub-pipe sections is greater than three, and the injector 70 is multiple and includes at least one fracturing valve 71 and at least one ball fracturing sleeve 72. The number of sub-pipe sections is different according to the different stages of fracturing, and each stage of fracturing comprises an ejector 70, wherein the ejector 70 adopted by the first stage is a fracturing valve 71, and other stages adopt a ball-throwing fracturing sliding sleeve 72.
As shown in fig. 1, the number of fracturing valves 71 is one and located at the end of the horizontal pipe section remote from the vertical pipe section relative to the ball fracturing slide 72. The fracturing valve 71 is used as the injector 70 of the first stage, and liquid enters the outer space of the pipe column of the first stage through the fracturing valve 71, so that fracturing construction is performed.
As shown in fig. 1, the ball fracturing slide 72 is a plurality of ball fracturing slide 72, and the plurality of ball fracturing slide 72 is connected to the oil pipe 10 by screw threads. The ball-throwing fracturing sliding sleeve 72 is used for providing a liquid supply channel for stratum fracturing, communicating with the stratum, and determining the number of the ball-throwing fracturing sliding sleeves 72 according to the number of stages of fracturing transformation required.
As shown in fig. 1, the fracturing string further comprises a guide head 80, and the end of the horizontal pipe section, which is far away from the vertical pipe section, is provided with a guide head 80. The guide head 80 has a guiding function and can guide the oil pipe 10 to advance in the shaft, so that the oil pipe 10 can be conveniently lowered.
As shown in fig. 1, the different ejectors 70 have different diameters, which increase in order in the direction approaching the vertical tube segment. In order to achieve a better fracturing effect, the fracturing device needs to perform staged fracturing, and sealing balls 90 with different diameters are thrown into a wellhead, and the sealing balls 90 stop at positions of corresponding ejectors 70 according to the diameters so as to perform staged fracturing.
Optionally, the packing element of the packer 40 and/or the sealing ball 90 that is thrown into the ball fracturing sleeve 72 are made of a soluble material. Thus, at the end of the fracturing operation, during the production of the oil and gas well, the soluble materials can be automatically dissolved, the packer 40 is unsealed, and the ball-throwing fracturing sliding sleeve 72 is restored to the original diameter.
Preferably, the soluble material is an aluminum magnesium alloy.
Preferably, the hanger 30 is a slip-type casing 20 hanger 30. The slip type casing 20 hanger 30 can meet the use requirement, can play a good role in fixing the whole pipe column, and can avoid peristaltic movement of the pipe column during fracturing construction.
As shown in fig. 2 to 8, the method of the mine fracturing operation includes a forward circulation well flushing operation and a fracturing operation after a fracturing string is lowered into a casing 20. Through the well flushing operation, the inside of the shaft is cleaned up, so that the fracturing string can be smoothly set.
As shown in fig. 4 to 8, the fracturing operation is performed by a pre-fracturing step including an integral in-pipe pressurization treatment of the fracturing string to set the packer 40 of the fracturing string, setting and fixing the hanger 30 of the fracturing string on the inner wall of the casing 20 as the in-pipe pressure of the fracturing string continues to increase, and pulling out the section of the tubing 10 of the fracturing string located above the hanger 30. In addition, the hanger 30 is set to prevent pollutants outside the sleeve 20 from entering the sleeve 20 to influence the fracturing operation, and the hanger 30 is provided with slips which are clamped on the inner wall of the sleeve 20 to fix the oil pipe 10, and the oil pipe 10 of the fracturing string above the hanger 30 is lifted out to enlarge the internal liquid supply space of the sleeve 20, reduce the along-path friction of fracturing liquid, reduce the wellhead construction pump pressure and improve the construction displacement.
As shown in fig. 5, the pre-fracturing step also includes the need to lift the release tool 50 with the pipe section above the hanger 30 when the hanger 30 is connected to an adjacent pipe section by the release tool 50 of the fracturing string. After the releasing tool 50 and the pipe section above the hanger 30 are pulled out, the fracturing operation can be directly carried out on the fracturing pipe column in the sleeve 20 at the hanger 30, meanwhile, the internal operation space of the sleeve 20 is increased, a sufficient liquid supply channel is provided for large-displacement fracturing construction, and the operation efficiency is improved.
When the setting tool 50 is set out with the pipe section above the hanger 30, the setting tool 50 is set out from the casing 20 with the pipe section above the hanger 30 by the fishing string 100, with the fishing string 100.
As shown in fig. 4 to 8, the fracturing operation further includes a staged fracturing step after the pre-fracturing step, wherein the staged fracturing step includes progressively pitching and progressively pressurizing the fracturing string such that the sand blast holes of each injector 70 of the fracturing string are sequentially opened in a direction approaching the vertical pipe section, and the liquid and/or gas ejected from the sand blast holes flows into the formation through the perforated interval of the casing 20. Through throwing ball step by step to the fracturing string, pressurizing step by step, realize the hierarchical operation of fracturing string, liquid and/or gas gets into in the sleeve pipe 20 through sprayer 70, then flows into the stratum through sleeve pipe 20 perforation interval under its pressure's effect, and the liquid in the stratum flows into in the sleeve pipe 20 by the jet orifice, and the fracturing operation of each stage goes on step by step, does not influence each other, is favorable to improving the efficiency of fracturing operation, convenient to operate.
As shown in fig. 9 to 13, the horizontal well staged repeating fracturing operation method further includes a string salvage and recovery operation after completion of the fracturing operation, the salvage and recovery operation including dissolving a packing element of a packer 40 of the fracturing string and a sealing ball 90 located in an injector 70 of the fracturing string by adding a dissolving agent or self-dissolving into the fracturing string, salvaging a hanger 30 of the fracturing string, and salvaging an oil pipe 10 of the fracturing string from within a casing 20. When the recovery operation is carried out, the sealing ball 90 and the packer 40 are required to be dissolved, so that the pressure in the casing 20 and the fracturing string tend to be balanced, then the fracturing string in the casing 20 is salvaged through the salvaging string 100, when the salvaging is started, the slips of the hanger 30 can be retracted in an upward lifting mode to be separated from the inner wall of the casing 20, meanwhile, the setting of the hanger 30 is finished, then the upward lifting force is continuously increased, the fracturing string is salvaged out, if the upward lifting force has reached the upper limit in the upward lifting process, the progressive salvaging can be carried out, at this time, the upward lifting is continued, the upper body and the upper string of the ball-throwing fracturing sliding sleeve 72 are firstly salvaged, and then the lower body and the lower string are salvaged.
When the sealing ball 90 and the packer 40 are not completely dissolved, the dissolution may be performed by injecting an acidic solution such as high-concentration brine.
In this embodiment, the method further comprises a pre-installation step when the fracturing string is lowered into the casing 20, wherein the pre-installation step comprises the steps of sequentially connecting each pipe section of the oil pipe 10 of each fracturing string, installing an ejector 70 between two adjacent sub pipe sections, installing a guide head 80 on one end extending into the casing 20, and installing a packer 40 and a hanger 30 of the fracturing string on the oil pipe 10.
The hydraulic safety joint 60 is used for releasing the lower constraint of the hanger 30 when the lifting and the unsealing of the hanger 30 are difficult, and the ball throwing and the pressure holding of the hydraulic safety joint 60 can be released from the lower pipe column first, so that the unsealing of the hanger 30 is facilitated.
From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:
1. because the oil pipe is provided with a plurality of pipe sections, the oil pipe can be taken out in sections in the salvage process, the difficulty of taking out is reduced, and the efficiency is improved;
2. The hanger is arranged on the oil pipe, so that the effect of fixing the pipe column is achieved, the peristaltic movement of the pipe column in the fracturing process is effectively avoided, and the hanger has a sealing effect and can achieve a certain sealing effect on the inside and the outside of the pipe column;
3. And the pipe section of the oil pipe above the hanger is taken out in the fracturing process, so that the internal space of a shaft is increased, and a formed large-space fracturing fluid supply channel of the shaft is formed, thereby being beneficial to increasing the fracturing construction displacement.
It will be apparent that the embodiments described above are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (16)
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| CN102022104A (en) * | 2010-11-06 | 2011-04-20 | 大庆油田有限责任公司 | Open-hole packer for open-hole horizontal well and preset connector fracturing well completion method |
| CN104100250A (en) * | 2013-04-15 | 2014-10-15 | 中国石油化工股份有限公司 | Integrated pipe column system and fracturing process method for staged fracturing well completion of open hole horizontal well |
| CN209067186U (en) * | 2018-09-04 | 2019-07-05 | 中国石油天然气股份有限公司 | Fracturing string |
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| US4051894A (en) * | 1976-07-12 | 1977-10-04 | Baker International Corporation | Single string hanger system |
| US6907936B2 (en) * | 2001-11-19 | 2005-06-21 | Packers Plus Energy Services Inc. | Method and apparatus for wellbore fluid treatment |
| US7096954B2 (en) * | 2001-12-31 | 2006-08-29 | Schlumberger Technology Corporation | Method and apparatus for placement of multiple fractures in open hole wells |
| CN201924884U (en) * | 2010-11-16 | 2011-08-10 | 中国石油天然气股份有限公司 | Large-drift-diameter opening sliding sleeve for horizontal well fracturing completion and integrated tubular column thereof |
| CN103643931A (en) * | 2013-12-18 | 2014-03-19 | 中国海洋石油总公司 | Completion and fracture integrated pipe column of offshore openhole horizontal well and construction method of pipe column |
| CN204877413U (en) * | 2015-06-27 | 2015-12-16 | 成都科特柯本科技有限公司 | Horizontal well packer sliding sleeve staged fracturing tubular column |
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| CN102022104A (en) * | 2010-11-06 | 2011-04-20 | 大庆油田有限责任公司 | Open-hole packer for open-hole horizontal well and preset connector fracturing well completion method |
| CN104100250A (en) * | 2013-04-15 | 2014-10-15 | 中国石油化工股份有限公司 | Integrated pipe column system and fracturing process method for staged fracturing well completion of open hole horizontal well |
| CN209067186U (en) * | 2018-09-04 | 2019-07-05 | 中国石油天然气股份有限公司 | Fracturing string |
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