CN111794710B - Soluble bridge plug - Google Patents
Soluble bridge plug Download PDFInfo
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- CN111794710B CN111794710B CN202010816301.7A CN202010816301A CN111794710B CN 111794710 B CN111794710 B CN 111794710B CN 202010816301 A CN202010816301 A CN 202010816301A CN 111794710 B CN111794710 B CN 111794710B
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- 230000033001 locomotion Effects 0.000 claims abstract description 16
- 239000000956 alloy Substances 0.000 claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 238000002474 experimental method Methods 0.000 claims description 8
- 238000001125 extrusion Methods 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims description 3
- 210000000078 claw Anatomy 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 7
- 238000012360 testing method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000002904 solvent Substances 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
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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
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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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)
- Rolls And Other Rotary Bodies (AREA)
Abstract
The invention provides a soluble bridge plug. The conical cylinder part is made of a soluble alloy material, the outer surface of the conical cylinder part is a conical surface, and the outer surface is provided with protruding coarse-tooth threads or grooves matched with the coarse-tooth threads; also included is a set of dissolvable slips comprising a plurality of slips made of dissolvable alloy material; forming grooves on the inner surface of the soluble slip group, which are matched with the rough threads on the outer surface of the cone, or rough threads which are matched with the grooves on the outer surface of the cone, so that the soluble slip group can perform spiral expansion motion on the outer surface of the cone relative to the cone; the annular tailstock is made of a soluble alloy material, a screw hole which is connected with the threaded section at the end part of the central connecting shaft in a matching way is formed in the center of the annular tailstock, one side of the annular tailstock is abutted against one side of the soluble slip group, and the soluble slip group can be pushed to perform spiral expansion motion relative to the conical barrel part along the outer surface of the conical barrel part under the traction action of the central connecting shaft.
Description
Technical Field
The invention relates to the technical field of oil-gas field and shale gas development, in particular to a soluble bridge plug for multistage fracturing.
Prior Art
In the development of shale gas, the shale gas well needs to be subjected to staged fracturing, and a bridge plug plays an important role in plugging the shale gas well. In shale gas development at present, mainly adopt soluble bridging plug, soluble bridging plug is made by soluble metal and degradable rubber, cooperates with conventional setting tool, pumps into the well and realizes the segmentation fracturing, can directly test oil and put into production after accomplishing the fracturing, and bridging plug then is quick-dissolving under flowing back effect. The method is convenient for production and later-stage measure construction without salvaging, drilling and grinding and any intervention measures.
When the soluble bridge plug shown in CN203925413U is set underground, as shown in figures 1-2, the push ring 3 is displaced downwards under the action of setting force, the lower cone 9 pushes the lower soluble slip group 10 to expand to clamp the well wall 1, then the rubber cylinder group 7 expands to realize setting, and finally the upper cone 5 pushes the upper soluble slip group 4 to expand to clamp the well wall, and the setting process is finished.
After the fracturing process is finished, the bridge plug 12 is integrally reserved in the well pipe 1, the soluble upper slip set 4 and the soluble lower slip set 10 which are processed by adopting the soluble metal materials are automatically degraded and disappear after a period of time, and the rubber cylinder set 7 is elastically restored to be unsealed. The prior art has the problems that the rubber cylinder is difficult to degrade and the well bore is often blocked due to the rubber cylinder in the later construction period.
Technical proposal
The present patent proposes a soluble bridge plug in order to overcome the above problems.
In one scheme, the soluble bridge plug comprises a cone-shaped cylinder made of a soluble alloy material, wherein an axial channel is arranged in the cone-shaped cylinder, the outer surface of the cone-shaped cylinder is a conical surface, and a protruding rough thread or a groove matched with the rough thread is arranged on the outer surface; a central connecting shaft axially slidably inserted into the channel inside the cone, an end surface of the central connecting shaft being provided with a threaded section; the inner surface of the soluble slip group is an inner conical surface matched with the outer surface of the conical barrel part in shape, and the outer surface is a cylindrical surface coaxial with the central connecting shaft; forming grooves on the inner surface of the soluble slip group, which are matched with the rough threads on the outer surface of the cone, or rough threads which are matched with the grooves on the outer surface of the cone, so that the soluble slip group can perform spiral expansion motion on the outer surface of the cone relative to the cone; the annular tailstock is made of a soluble alloy material, a screw hole which is connected with the threaded section at the end part of the central connecting shaft in a matching way is formed in the center of the annular tailstock, one side of the annular tailstock is abutted against one side of the soluble slip group, and the soluble slip group can be pushed to perform spiral expansion motion relative to the conical barrel part along the outer surface of the conical barrel part under the traction action of the central connecting shaft.
In a further aspect, the device further comprises a sealing ring made of soluble rubber and abutting against one end of the annular tailstock of the soluble slip set away from the annular tailstock, the sealing ring being capable of moving and expanding along the outer surface of the cone member when pushed by the slip set in a helical expansion motion.
In a further scheme, the automatic clamping device further comprises a clamping ring, an internal thread is arranged at a through hole in the center of the clamping ring and used for being arranged on the center connecting shaft through a thread connecting sleeve, the outer diameter of the clamping ring is larger than the outer diameter of an inner channel of the conical barrel, so that the conical barrel is limited, and the conical barrel and the soluble slip set are positioned between the clamping ring and the annular tailstock through the clamping ring and the annular tailstock connected with a thread section at the end part of the center connecting shaft.
In a further aspect, the outer surface of the slip has a parallel-grain jaw configuration.
In a further scheme, the pitch of the coarse thread protruding from the outer surface of the cone part or the groove matched with the coarse thread is set to be variable pitch or fixed pitch; when the screw pitch is set to be a variable screw pitch, the screw pitch of the coarse thread or the groove is larger at one side of the cone barrel part close to the cone top, and the screw pitch is smaller at one side of the cone bottom; when the screw pitch is set to be a fixed screw pitch, the radian of the inner surface of the slip group is set to be matched with the radian of the outer surface of the cone barrel part, which is close to the cone bottom.
In a further aspect, only one row of coarse threads or grooves is provided on the inner surface of the slip.
In a further scheme, on the one side that annular tailstock and slips group were supported, still concave be equipped with radial sliding tray, slips assorted one side along radial protruding be equipped with sliding tray complex rib to make the slips group in radial expansion's in-process can slide along the sliding tray.
In a further scheme, the slip group comprises 6 slips, the shape of the groove or the rough thread on the surface of the conical barrel part is set to be 6 involute lines, and the rotation angle of each involute line on the surface of the conical barrel part is one circle.
In a further aspect, an experimental apparatus is provided, in which a displacement sensor is disposed on an inner surface of an end of a slip set near an annular tailstock to detect whether rotational movement of the slips occurs; and a pressure sensor is arranged between the annular tailstock and the slip group so as to detect the extrusion force of the annular tailstock to the slip group, and sensing signals of the displacement sensor and the pressure sensor are transmitted to the ground for monitoring through a signal transmission line arranged in the central connecting shaft.
According to the invention, the slip group and the cone barrel part are axially locked through the matching relation of the rough tooth threads and the grooves, so that the bonding strength of the slip and the cone barrel is enhanced, and the axial disengagement is prevented. Compared with the prior art, the locking connecting piece is additionally arranged, so that the number of components is saved, the processing and the assembly are simple and convenient, the integrity is better, and the strength is higher.
Drawings
FIG. 1 is a semi-sectional view of a prior art soluble bridge plug prior to setting
FIG. 2 is a semi-sectional view of a prior art soluble bridge plug after setting
FIG. 3A is a perspective view of the bridge plug in its original state
FIG. 3B is a cross-sectional view of the bridge plug in its original state
FIG. 3C is an exploded view of the bridge plug
FIG. 4 is a perspective view of a cone
FIG. 5is a perspective view of a slip
FIG. 6 is a perspective view of the bridge plug after completion of setting
FIG. 7 is a cross-sectional view of a bridge plug experimental set-up
Detailed Description
As shown in fig. 3A, 3B and 3C, the bridge plug in this patent comprises a cone member 1 made of a dissolvable alloy material, a recyclable center connection shaft 2 capable of withstanding a strong tensile force, a dissolvable slip set 3 made of a dissolvable alloy material, and an annular tailstock 4 made of a dissolvable alloy material.
Wherein, the cone cylinder 1 is made of a soluble alloy material, an axial channel 10 is arranged in the cone cylinder 1, the outer surface of the cone cylinder 1 is a conical surface, and a raised rough thread 30 or a groove 11 matched with the rough thread is arranged on the outer surface;
A central connection shaft 2 axially slidably inserted in the channel 10 inside the cone, the end surface of the central connection shaft 2 being provided with a threaded section 21;
The soluble slip set 3 comprises a plurality of slips 31-36, preferably 6 slips, made of a soluble alloy material, and the soluble slip set 3 surrounds the outer surface of the cone member 1 in a relatively movable manner, the inner surface of the soluble slip set 3 is an inner conical surface matched with the outer surface of the cone member 1 in shape, and the outer surface is a cylindrical surface coaxial with the central connecting shaft 2.
Grooves 11 matching with the rough threads 30 on the outer surface of the cone 1 or rough threads 30 matching with the grooves 11 on the outer surface of the cone 1 are formed on the inner surface of the soluble slip group 3, so that the soluble slip group 3 can perform spiral expansion motion relative to the cone 1 on the outer surface of the cone 1;
The annular tailstock 4 is made of a soluble alloy material, a screw hole 41 which is in matched connection with the screw thread section 21 at the end part of the central connecting shaft 2 is formed in the center of the annular tailstock 4, one side of the annular tailstock 4 is abutted against one side of the soluble slip group 3, and the soluble slip group 3 can be pushed to perform spiral expansion motion relative to the conical barrel part 1 along the outer surface of the conical barrel part 1 under the traction action of the central connecting shaft 2.
Still include snap ring 6, the through-hole department at snap ring 6 center has the internal thread for establish on central connecting axle 2 through the thread connection cover, the external diameter of snap ring 6 is greater than the external diameter of the inside passageway 10 of cone 1, in order to play spacing to cone 1, through snap ring 6 and the annular tailstock 4 of being connected with the screw thread section 21 of central connecting axle 2 tip, with cone 1 and soluble slips group 3 location between snap ring 6 and annular tailstock 4.
The surface of each slip is provided with a ceramic jaw structure 311 of parallel lines.
In the process of carrying out fracturing experiments, the device is assembled firstly, the clamping ring 6, the conical barrel part 1, the sealing ring 5, the soluble slip group 3 and the annular tailstock 4 are sequentially arranged on the central connecting shaft 2 in a penetrating or threaded mode, the slip group is wrapped through the sealing ring 5, and therefore the bridge plug is ensured not to loose and drop in the underground conveying process. Next, the setting tool and bridge plug are transported along the hoistway to a predetermined location where sealing is required using a transport tool. Then, the end face of the cone barrel 1 is propped against by using a setting tool, so that the cone barrel 1 is fixed, and the central connecting shaft 2 is pulled towards the uphole direction; under the drive of the central connecting shaft 2, the annular tailstock 4 which is in threaded connection with the end part of the central connecting shaft 2 synchronously moves axially, so that the slip group 3 and the sealing ring 5 are pushed to synchronously move along the axial direction of the central connecting shaft 2 in the uphole direction; so that the slip group 3, the sealing ring 5 and the fixed cone part 1 are relatively displaced. As shown in fig. 6, the slip group 3 and the sealing ring 5 are expanded by the extrusion action of the outer conical surface of the conical barrel part 1, so that the ceramic claw structure 311 on the surface of the slip 3 can be embedded into and grasp the well wall, so that the bridge plug is firmly fixed in the well, the bridge plug is prevented from sliding in the well, and a certain seal is formed. In addition, the sealing ring 5 made of soluble rubber forms a tight seal with the well wall due to the extrusion and expansion effects, so that the fracturing experiment can be smoothly carried out. Finally, as the force for pulling the central connecting shaft 2 increases, the threaded section 21 at the end part of the central connecting shaft 2 and the screw hole 41 of the annular tailstock 4 are tripped, and the setting tool and the central connecting shaft 2 are withdrawn from the ground, so that setting construction is completed, and a fracturing experiment can be carried out. After the fracturing experiment is finished, the bridge plug is dissolved by the solvent, so that the oil and gas exploitation operation is facilitated.
In the invention, in order to prevent axial detachment between the slips 3 and the cone barrel part 1 in a fracturing experiment, the contact surface of the slips 3 and the cone barrel part 1 is provided with the matching of coarse threads and grooves. When the slip group 3 moves along the axial direction relative to the surface of the cone 1, the slip group 3 and the surface of the cone 1 are subjected to circumferential relative rotation due to the cooperation of the rough tooth threads and the grooves, so that the rough tooth threads 30 on the inner surface of the slip 3 perform spiral movement by taking the grooves 11 on the outer surface of the cone as tracks. The slip group 3 and the cone barrel part 1 are axially locked through the matching relation of the rough thread and the groove, so that the bonding strength of the slips and the cone barrel is enhanced, and the axial detachment is prevented. Compared with the prior art, the locking connecting piece is additionally arranged, so that the number of components is saved, the processing and the assembly are simple and convenient, the integrity is better, and the strength is higher.
Fig. 4 shows a perspective outline of the cone 1 according to the invention.
The arrangement of the grooves 11 in the outer surface of the cone 1 can be more clearly understood. The groove 11 mates with the coarse thread 30 on the inner surface of the slip 3. Because the groove 11 has the condition of reducing on the cone surface of the cone barrel part 1, in the process of changing from the cone top to the cone bottom, the diameter of a curve formed by the groove is increased along with the increase of the cone diameter, and the radian of the groove is changed, so that the problem that the groove is possibly not matched with the coarse tooth threads on the inner surface of the slip can occur.
To solve this problem, when the grooves 11 on the surface of the conical member 1 have a fixed pitch, the diameters of the grooves are gradually increased from small to large, and the radian is gradually increased. At this time, in order to enable the slips 3 to be radian-matched with the grooves 11 of the cone 1 when in the locked position, the radian of the inner surface of the slips 3 is set to a large diameter so as not to affect the orbital movement of the coarse thread 30 in the grooves 11. In addition, the pitch of the groove 11 on the surface of the cone member 1 can be designed to be variable, namely, the pitch is larger when approaching the top end of the cone body and smaller when approaching the bottom end of the cone body, so that the radian of the groove 11 on the surface of the cone member is consistent.
The arrangement of the pitch of the grooves 11 and the coarse thread 30 is very important. When the pitch setting is small, possibly due to the small thread angle, the reaction force of the conical member to the slips in the circumferential direction is insufficient, the slips 3 cannot rotate along the grooves 11, and the grooves 11 and the coarse threads 30 are tripped, so that the locking effect between the slip set 3 and the conical barrel member 1 cannot be achieved. When the pitch setting is large, although the slips 3 are easily screwed along the grooves 11, the biting force between the grooves 11 and the coarse thread 30 is small, and the axial locking effect is weak.
Through experiments, in the invention, the groove 11 on the surface of the conical barrel part 1 is set to be 6 involute lines, the number of the involute lines is matched with that of the slips in the slip group 3, and the rotation angle of each involute line on the surface of the conical barrel part 1 is one circle. The contradiction problems that the rotation is impossible and the locking effect is weak can be solved.
In another embodiment, the grooves 11 on the surface of the conical barrel part 1 in the above scheme can be replaced by coarse threads.
As shown in fig. 5, the slips 3 are generally provided with only one row of coarse threads 30 on their inner surfaces. The problem that when the multi-row coarse thread 30 is arranged, the slip 3 and the cone barrel part 1 are difficult to slide relatively due to the problem of reducing in the relative movement, and the problem that the slip cannot be matched with the buckle due to locking and releasing is solved. When the surface of the cone 1 is provided with a coarse thread, the inner surface of the slips 3 is correspondingly provided as a groove.
As shown in fig. 3A and 3C, on the surface where the annular tailstock 4 abuts against the slip set 3, a radial sliding groove 42 is further concavely provided, and on the matched side of the slip 3, ribs 312-362 matched with the sliding groove 42 are convexly provided along the radial direction, so that the slip set 3 can slide along the sliding groove 42 in the radial expansion process, the slip sets are prevented from sliding circumferentially with each other under the pushing of the annular tailstock, and extrusion and interference among the slips 3 are avoided. Meanwhile, when the slip group 3 expands and rotates along the spiral line, the annular tailstock 4 can be driven to rotate circumferentially, so that the annular tailstock 4 rotates relatively to the center connecting shaft 2 in threaded connection. Therefore, the connection strength of the central connecting shaft 2 and the annular tailstock 4 is gradually reduced, and the tripping at the end of setting is facilitated.
Example 2
As mentioned above, the arrangement of the pitch of the grooves 11 and the coarse threads 30 is very important. When the pitch setting is small, possibly due to the small thread angle, the reaction force of the conical member to the slips in the circumferential direction is insufficient, the slips 3 cannot rotate along the grooves 11, and the grooves 11 and the coarse threads 30 are tripped, so that the locking effect between the slip set 3 and the conical barrel member 1 cannot be achieved. When the pitch setting is large, although the slips 3 are easily screwed along the grooves 11, the biting force between the grooves 11 and the coarse thread 30 is small, and the axial locking effect is weak.
In addition, since the groove 11 has a diameter change on the conical surface of the conical barrel member 1, the diameter of the curve formed by the groove increases with the increase of the diameter of the conical barrel in the process of changing from the conical top to the conical bottom, and the radian of the groove changes, so that the problem that the groove is not matched with the coarse thread on the inner surface of the slip is likely to occur.
In order to solve the problem of selecting the pitch of the groove and the coarse thread, as shown in fig. 7, in this embodiment, an experimental device for setting a bridge plug is also provided. In the embodiment 2, an experimental apparatus in which the displacement sensor 8 and the pressure sensor 7 are combined is used. Thereby facilitating the pitch selection test.
A displacement sensor 8 is provided on the inner surface of the slip set 3 at the end near the annular tailstock 4 to detect whether rotational movement of the slips has occurred; and a pressure sensor 7 is arranged between the annular tailstock 4 and the slip group 3 to detect the extrusion force of the annular tailstock on the slip group. The sensing signals of the displacement sensor 8 and the pressure sensor 7 are transmitted to the ground for monitoring through a signal transmission line arranged in the central connecting shaft 2.
Multiple tests are performed with the experimental device for different pitch schemes, respectively, so that a preferred pitch scheme can be selected from the multiple tests.
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the disclosure referred to in the present application is not limited to the specific combinations of technical features described above, but also covers other technical features which may be formed by any combination of the technical features described above or their equivalents without departing from the spirit of the disclosure. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (9)
1. An experimental device for a soluble bridge plug, characterized in that,
The soluble bridge plug comprises:
the conical barrel part (1) is made of a soluble alloy material, an axial channel (10) is formed in the conical barrel part (1), the outer surface of the conical barrel part (1) is a conical surface, and a protruding rough thread (30) or a groove (11) matched with the rough thread is formed in the outer surface;
a central connection shaft (2) axially slidably inserted into a channel (10) inside the cone, the end surface of the central connection shaft (2) being provided with a threaded section (21);
A soluble slip group (3) comprising a plurality of slips (31-36) made of a soluble alloy material, wherein the soluble slip group (3) surrounds the outer surface of the cone (1) in a relatively movable manner, the inner surface of the soluble slip group (3) is an inner cone matched with the shape of the outer surface of the cone (1), and the outer surface is a cylindrical surface coaxial with the central connecting shaft (2);
Grooves (11) matched with the rough threads (30) on the outer surface of the cone (1) or rough threads (30) matched with the grooves (11) on the outer surface of the cone (1) are formed on the inner surface of the soluble slip group (3), so that the soluble slip group (3) can perform spiral expansion motion relative to the cone (1) on the outer surface of the cone (1);
The annular tailstock (4) is made of a soluble alloy material, a screw hole (41) which is matched and connected with a thread section (21) at the end part of the central connecting shaft (2) is formed in the center of the annular tailstock (4), one side of the annular tailstock (4) is abutted against one side of the soluble slip group (3), and the soluble slip group (3) can be pushed to perform spiral expansion motion relative to the conical barrel part (1) along the outer surface of the conical barrel part (1) under the traction action of the central connecting shaft (2);
A displacement sensor (8) is arranged on the inner surface of one end, close to the annular tailstock (4), of the slip group (3) so as to detect whether the rotation movement between the slip group (3) and the cone (1) in the circumferential direction occurs or not and detect the relative displacement between the slip group (3) and the cone (1) in the axial direction; and set up pressure sensor (7) between annular tailstock (4) and slips group (3) to detect annular tailstock (4) to the extrusion force of slips group (3), displacement sensor (8) and pressure sensor (7)'s sensing signal, through the signal transmission line that sets up in central connecting axle (2), transmit ground and monitor.
2. The experimental device of claim 1, wherein the device comprises a plurality of sensors,
The soluble bridge plug further comprises a sealing ring (5) made of soluble rubber, and the sealing ring is abutted against one end of the annular tailstock (4) away from the soluble slip group (3), and the sealing ring (5) can move and expand along the outer surface of the cone part (1) when being pushed by the slip group (3) which performs spiral expansion motion.
3. The experimental device of claim 1, wherein the device comprises a plurality of sensors,
The soluble bridge plug further comprises a clamping ring (6), an internal thread is arranged at a through hole in the center of the clamping ring (6) and used for being arranged on the center connecting shaft (2) through a thread connecting sleeve, the outer diameter of the clamping ring (6) is larger than the outer diameter of an inner channel (10) of the conical barrel part (1) so as to limit the conical barrel part (1), and the conical barrel part (1) and the soluble slip group (3) are positioned between the clamping ring (6) and the annular tailstock (4) through the clamping ring (6) and the annular tailstock (4) connected with a thread section (21) at the end part of the center connecting shaft (2).
4. The experimental device of claim 1, wherein the device comprises a plurality of sensors,
The outer surfaces of the slips (31-36) are provided with claw structures (311) with parallel lines.
5. The experimental device of claim 1, wherein the device comprises a plurality of sensors,
The pitch of the rough thread (30) protruding from the outer surface of the cone barrel part (1) or the pitch of the groove matched with the rough thread is set to be variable pitch or fixed pitch;
when the screw pitch is set to be a variable screw pitch, the screw pitch of the coarse thread or the groove is larger at one side of the cone barrel part (1) close to the cone top, and the screw pitch is smaller at one side of the cone bottom;
When the screw pitch is set to be a fixed screw pitch, the radian of the inner surface of the slip group (3) is set to be matched with the radian of the outer surface of the cone barrel part (1) close to the cone bottom.
6. The experimental device of claim 1, wherein the device comprises a plurality of sensors,
Only one row of coarse threads (30) or grooves (11) are provided on the inner surface of the slips (31-36).
7. The experimental device of claim 1, wherein the device comprises a plurality of sensors,
And a radial sliding groove (42) is concavely formed in one propped surface of the annular tailstock (4) and the slip group (3), and ribs (312) matched with the sliding groove (42) are convexly arranged on the matched side of the slip along the radial direction, so that the slip group (3) can slide along the sliding groove (42) in the radial expansion process.
8. The experimental device of claim 1, wherein the device comprises a plurality of sensors,
The slip group (3) comprises 6 slips, the shape of a groove or a rough thread on the surface of the conical barrel part (1) is set to be 6 involute, and the rotation angle of each involute on the surface of the conical barrel part (1) is a circle.
9. An experimental method for an experimental set-up as claimed in claim 1, characterized in that,
The method comprises the steps of setting recording equipment on the ground, receiving and recording relative rotation displacement signals between a cone (1) and a slip set (3) sent by a displacement sensor (8), relative rotation displacement signals between the cone (1) and the slip set (3) in the circumferential direction, pressure signals between an annular tailstock (4) and the slip set (3) sensed by a pressure sensor (7), setting various possible combinations for the thread pitch, the tooth profile, the tooth height, the groove shape and the groove depth of the coarse tooth threads and grooves, respectively carrying out downhole setting experiments for each combination, judging whether circumferential rotation occurs between the annular tailstock (4) and the slip set (3) according to the relative rotation displacement signals and the pressure signals, recording the required pressure tension when circumferential rotation begins, judging whether release occurs between the coarse tooth threads and the grooves, and recording the pressure of a central connecting shaft (2) when the coarse tooth threads are released from the annular tailstock (4), and selecting the optimal combination of the thread pitch, the tooth profile, the groove depth and the coarse tooth profile and the groove depth of the coarse tooth profile, and the optimal combination.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010816301.7A CN111794710B (en) | 2020-08-14 | 2020-08-14 | Soluble bridge plug |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010816301.7A CN111794710B (en) | 2020-08-14 | 2020-08-14 | Soluble bridge plug |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111794710A CN111794710A (en) | 2020-10-20 |
| CN111794710B true CN111794710B (en) | 2024-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010816301.7A Active CN111794710B (en) | 2020-08-14 | 2020-08-14 | Soluble bridge plug |
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| CN (1) | CN111794710B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112761606A (en) * | 2021-01-26 | 2021-05-07 | 西安费诺油气技术有限公司 | FDC all-metal soluble fracturing nipple |
| CN112727398B (en) * | 2021-02-05 | 2022-06-10 | 四川捷贝通能源科技有限公司 | Trace rubber sealed soluble bridge plug |
| US11326416B1 (en) * | 2021-06-23 | 2022-05-10 | Vertechs Petroleum Technology Innovation & Equipment Manufacturing Co., LTD | Spiral deployed isolation tool |
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| US8997859B1 (en) * | 2012-05-11 | 2015-04-07 | Exelis, Inc. | Downhole tool with fluted anvil |
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