CN114941514B - Split type soluble ball seat structure suitable for volume fracturing - Google Patents
Split type soluble ball seat structure suitable for volume fracturing Download PDFInfo
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- CN114941514B CN114941514B CN202210657134.5A CN202210657134A CN114941514B CN 114941514 B CN114941514 B CN 114941514B CN 202210657134 A CN202210657134 A CN 202210657134A CN 114941514 B CN114941514 B CN 114941514B
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- Prior art keywords
- slip
- ring
- ball seat
- sealing ring
- soluble
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- 238000007789 sealing Methods 0.000 claims abstract description 76
- 239000002184 metal Substances 0.000 claims abstract description 52
- 238000004873 anchoring Methods 0.000 claims abstract description 25
- 125000006850 spacer group Chemical group 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims description 20
- 230000008569 process Effects 0.000 claims description 20
- 239000011159 matrix material Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000009826 distribution Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 244000208734 Pisonia aculeata Species 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002195 soluble material Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- 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
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
-
- 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
Landscapes
- 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)
- Prostheses (AREA)
Abstract
The invention discloses a split type soluble ball seat structure suitable for volume fracturing, relates to the technical field of soluble bridge plugs, and is used for solving the problems of incomplete anchoring and inaccurate sealing of the existing soluble bridge plugs; the soluble ball seat comprises a releasing pull rod, a tail cone, a metal sealing ring, a rubber sealing ring, a spacer ring, a locking sleeve, a rubber hoop, a slip base body, slip blocks and an anti-collision ring which are sequentially connected, wherein the cone is sequentially sleeved with the metal sealing ring, the spacer ring and the rubber sealing ring, and the slip body is circumferentially provided with an embedded slip block; the soluble ball seat structure adopts a single slip structure, and adopts a slip block to replace a sealing mode of combining a clamp pin and a metal sealing ring with a rubber sealing ring, so that the whole anchoring bearing performance of the soluble ball seat is greatly improved; on the basis of ensuring the current pressure-bearing grade requirement, the sealing performance of the soluble ball seat is greatly improved.
Description
Technical Field
The invention relates to the technical field of soluble bridge plugs, in particular to a soluble ball seat structure capable of improving anchoring performance and sealing performance.
Background
With the increase of the external dependence of oil and gas resources in China, the strength of oil and gas resource exploration and development is urgently needed to be increased, and oil and gas yield is improved, however, conventional oil and gas resources cannot meet the requirements, and unconventional resources represented by shale gas and compact oil and gas gradually become the main force of oil and gas production.
Horizontal well volume fracturing is a key technology for unconventional tight oil and gas recovery. The soluble ball seat has the characteristics of quick solubility, full-diameter production, simple construction process and the like, is rapidly popularized in the volumetric fracturing construction operation, and brings about revolutionary progress of the horizontal well staged multi-cluster fracturing technology. In the prior art, the soluble ball seat is usually anchored by embedding a tile nail, so that the stress and the strain of the embedded tile nail are concentrated near the contact part with the casing wall, and experiments show that the maximum stress on the tile nail far exceeds the yield strength of the material, and the tile nail is subjected to larger plastic deformation, so that the tile nail is anchored failure; in addition, volume fracturing underground operation is often in severe environments and working conditions such as high temperature, high pressure, heavy load, strong corrosion and the like, and the metal sealing ring is torn and broken in a body structure under a setting working condition, and sealing failure and other phenomena in the fracturing process occur sometimes, so that the ball seat setting fails, the inter-section sealing is not tight, fracturing fluid is lost, the inter-cluster fracturing hydraulic energy loss is overlarge, the fracturing operation fails, and even underground accidents are caused.
Therefore, based on the above situation, we provide a split type soluble ball seat structure which can increase the anchoring and sealing performance and is suitable for volume fracturing, and the soluble ball seat is subjected to structure optimization upgrading on the basis of a soluble ball plug so as to solve the problems of incomplete anchoring, poor sealing and the like.
Disclosure of Invention
The invention aims at: the split type soluble ball seat structure which can improve the anchoring performance and the sealing performance and is suitable for volume fracturing is provided, the structure adopts a single slip structure, and an embedded slip block is adopted to replace a clamp pin, a metal sealing ring is combined with a rubber sealing ring, so that the length of an original bridge plug is greatly reduced, the defects of unreasonable anchoring, loose sealing and the like of the existing ball seat are overcome, and the implementation of stratum fracturing technology can be effectively ensured.
The technical scheme adopted by the invention is as follows:
in order to achieve the above purpose, the invention provides a split type soluble ball seat structure which can improve anchoring performance and sealing performance and is suitable for volume fracturing, and the split type soluble ball seat structure comprises a cone, a slip base body and an anti-collision ring which are sequentially connected from top to bottom, wherein a metal sealing ring and a rubber sealing ring are sequentially sleeved on the cone, and slip blocks are axially installed on the slip base body.
Further, the slip piece structure is the skewed tooth, and slips tooth point orientation ball seat below for the contact stress distribution of skewed tooth is comparatively even.
Furthermore, two embedded slip blocks are arranged on the slip base structure, so that the overall contact stress distribution of the slips is uniform.
Further, the vertex angle alpha of the slip teeth of the slip block is 85 degrees, the inclination angle beta of the slip teeth is 70 degrees, the contact stress of the slip and the sleeve is ensured to be larger, the anchoring effect of the slip is good, and the safety of the slip in the working process can be ensured.
Furthermore, the slip body adopts split type, uses the soluble rubber hoop to tighten, and avoids tearing the spacer ring by adopting an integral slip.
Further, the slip body and the metal sealing ring are in surface contact, and in the setting process, the metal sealing ring and the slip are synchronously unfolded, so that synchronous development of anchoring and sealing is realized.
Further, the outer conical ring surface of the rubber sealing ring is matched with the inner conical ring surface of the metal sealing ring, so that the defect of metal sealing is overcome.
Further, the metal sealing ring is structurally improved, the width of one side, close to the tail cone, of the metal sealing ring is increased, the upper side inclination angle structure and the lower side inclination angle structure of the metal sealing ring groove are increased, the contact pressure distribution on the contact surface of the metal ring and the sleeve wall is uniform, the structural parameters of the metal sealing ring are optimized through an orthogonal test, and the thickness d of the metal ring is equal to the thickness d of the metal sealing ring 1 =9.4 mm, camber angle θ of metal ring groove 1 Metal ring groove depth d =20° 2 =3.8 mm, metal ring groove lower roll angle θ 2 Angle of inclination θ of contact surface of metal ring with sliding body =35° 3 Angle of inclination θ of contact surface of metal ring with sleeve wall =10° 4 =10°. Through experiments, the maximum stress born by the metal sealing ring can be verified to be reduced, and the structure is safer.
Furthermore, a spacer ring is added between the metal sealing ring and the slips and used for isolating the direct acting force of the slips on the metal sealing ring, and the stress of the metal sealing ring is uniform through the spacer ring.
Further, the locking sleeve is connected with the anti-collision ring through threads and used for limiting axial displacement of the anti-collision ring, the slips and the metal sealing ring.
Further, the anti-collision ring and the circumference of the tail cone are uniformly provided with anti-abrasion teeth, so that the ball seat is prevented from being worn in the well entering process, and the outer diameter of the ball seat is guaranteed.
Compared with the prior art, the invention has the following advantages:
1. the integral structure of the soluble ball seat adopts a single slip structure, so that the length of a bridge plug is greatly shortened, the use of the metal volume is reduced, the production cost is reduced, and the economic benefit is improved. Meanwhile, the soluble ball seat adopts a synchronous sealing mode of the rubber sealing ring and the metal sealing ring, compared with the single slip ball seat existing in the current market, the problem of insufficient sealing performance caused by mutual interference of anchoring and sealing in the setting process is effectively avoided, and the sealing performance of the soluble ball seat is greatly improved on the basis of ensuring the current pressure-bearing grade requirement.
2. According to the invention, the tooth tops of the embedded slips are contacted with the casing wall, and through numerical calculation and test, compared with the contact stress of the slip blocks, the contact stress distribution of the slip nails is relatively uniform, and under the conditions of high temperature and high pressure, the embedded slip nails can generate relatively large plastic deformation due to stress concentration, so that the anchoring failure of the slip is caused, therefore, the embedded slip blocks are selected as the ball seat anchoring structure, and the integral anchoring bearing performance of the soluble ball seat is improved.
3. According to the invention, the upper conical surface of the slip body is matched and connected with the contact surface of the lower conical surface of the anti-collision ring, so that the effective split of the slip can be ensured in the ball seat setting process, the slip body can be ensured to be uniformly opened along the slotting, and the anchoring capability of the slip can be greatly improved.
Drawings
FIG. 1 is a schematic illustration of a soluble tee structure of the present invention;
FIG. 2 is a schematic illustration of the soluble tee structure of the present invention in full section;
FIG. 3 is a schematic diagram showing the cooperation of the upper end surface of the spacer ring and the lower end surface of the slip in the invention;
FIG. 4 is a schematic view of a metal seal ring structure in accordance with the present invention;
fig. 5 is a schematic structural view of an embedded slip segment according to the present invention.
FIG. 6 is a schematic diagram of structural parameters of a metal seal ring according to the present invention.
In the figure: 1. releasing the pull rod; 2. caudal vertebrae; 3. anti-wear offset nails; 4. a metal seal ring; 5. a spacer ring; 6. a rubber hoop; 7. a slip base; 8. slip segments; 9. the upper end face of the slip; 10. the lower end surface of the anti-collision ring; 11. an anti-collision ring; 12. a pin; 13. a rubber seal ring; 14. a locking sleeve; 15. the upper end surface of the spacing ring; 16. and the lower end surface of the slip.
Detailed Description
The following describes the technical scheme in the embodiment of the present invention in full with reference to the accompanying drawings.
Example 1
Referring to fig. 1, 2 and 3, a split type soluble ball seat structure suitable for volume fracturing comprises a releasing pull rod 1, a tail cone 2, a metal sealing ring 4, a spacer ring 5, a rubber hoop 6, a slip base 7, slip segments 8, an anti-collision ring 11, a rubber sealing ring 13 and a locking sleeve 14, wherein the outer annular surface of the locking sleeve 14 is matched with the inner annular surface of the tail cone 2; two slip blocks 8 are axially arranged on each slip base 7, each slip block 8 is provided with helical teeth, and the sharp point of each slip block 8 faces to the lower part of the ball seat during assembly, so that the sleeve is easy to bite.
After the split type soluble ball seat is assembled, the length is less than 450mm, the outer diameter is 112mm, the inner diameter is 50mm, the whole length of the ball seat is short, and the rubber is less than the use amount of the soluble rubber plug.
The rubber sealing ring 13 and the metal sealing ring 4 interact in the anchoring process, the metal sealing ring 4 extrudes the rubber sealing ring 13 in the diameter expanding process, the rubber sealing ring 13 is extruded and expanded under the stress, and when the metal sealing ring 4 reaches the largest diameter setting sleeve, the rubber sealing ring 13 further compensates the sealing defect of the metal sealing ring 4, and the sealing performance of the ball seat is further improved.
The upper end face 15 of the spacer ring is in plane fit with the lower end face 16 of the slip, after the soluble ball seat is set, the spacer ring 5 expands in diameter, the slip base 7 expands along the radial direction, and the slip base 7 generates a tearing force in the diameter expanding process and is born by the spacer ring 5. The spacer ring 5 transmits axial force to the metal sealing ring 4 through the lower end surface of the spacer ring so as to ensure that the metal sealing ring 4 is not subjected to the action of tearing force in the diameter expanding process, so that the structure of the metal sealing ring 4 is deformed.
The locking sleeve 14 and the anti-collision ring 11 are in threaded connection, in the anchoring sealing process, the threads of the anti-collision ring 11 are matched with the locking sleeve 14 to form a self-locking mechanism, so that the setting success rate and the setting effect of the soluble ball seat can be ensured, and the site overall construction efficiency is improved.
The locking sleeve 14 is connected with the anti-collision ring 11 through threads, the anti-collision ring 11 is stressed by the releasing pull rod 1 to press the slip matrix 7, the spacer ring 5 and the metal sealing ring 4 backwards, the locking sleeve 14 is driven to move backwards, and when the anti-collision ring moves to the diameter-changing position of the inner diameter of the tail cone 2, the movement of the anti-collision ring 11 is limited, so that the functions of setting and anchoring are realized.
The upper end face 9 of the slip is in plane fit with the lower end face 10 of the anti-collision ring, the anti-collision ring 11 is acted by the releasing pull rod 1, force is applied to the slip base body 7 through the lower end face 10 of the anti-collision ring, the uniformity of force application is guaranteed through plane contact, and the anchoring performance of the slip is facilitated.
The pin 12 is made of a soluble material, after multiple tests and applications, the thread of the soluble material is sheared, the shearing end face is neat, the shearing value is stable, and no insoluble matters remain underground after shearing.
Example 2
The embodiment is further based on embodiment 1, referring to fig. 1 and 3, the slip base 7 is matched with the anti-collision ring 11 through plane contact, the slip base 7 is hooped into a whole by the rubber hoop 6, effective split of the slip in the ball seat sealing process can be ensured, the slip base 7 is uniformly opened, and the anchoring capability of the slip can be effectively improved.
This embodiment is further based on embodiment 1, and referring to fig. 1 and 2, two embedded slip segments 8 are provided on each slip matrix 7. It is experimentally known that the contact stress of the embedded slip segments 8 during anchoring is more uniform. The two slip blocks have better effect than the single slip block in biting the sleeve, and the anchoring capability of the slips can be effectively improved.
Example 3
Further, referring to fig. 1, on the basis of embodiment 1, anti-collision ring 11 is uniformly provided with anti-collision teeth 3 in the circumferential direction; the anti-wear teeth 3 are arranged in the circumferential anti-wear tooth holes of the anti-collision ring 11, play a role in preventing the ball seat from being worn in the well entering process and guaranteeing the outer diameter size of the ball seat.
After the ball seat is seated, the slip base 7 expands to the inner wall of the anchoring sleeve along the inclined plane of the tail cone 2, the rebound resilience of the metal sealing ring 4 provides a pull-back force for the slip base 7, and the pull-back force is matched with the inclined plane of the tail cone 2 to form balance, so that the slip base 7 is attached to the inner wall of the sleeve, and the slip falling problem of a single slip structure can be solved.
After the ball seat is seated, the slip base body 7 and the metal sealing ring 4 are expanded to the maximum diameter along the inclined plane of the tail cone 2, the metal sealing ring 4 is expanded to seal the ball seat, and the metal sealing is not tight due to the non-uniformity of the expanded diameter of the metal sealing ring, but the rubber sealing ring 13 is forced to expand in the expanding process at the hollow part of the inner ring, so that the sealing capability of the ball seat can be effectively improved.
The split type soluble ball seat structure suitable for volume fracturing solves the problems of insufficient anchoring capacity and poor metal sealing of the slip nail type ball seat, solves the problem of well bore blocking after fracturing, improves the economic applicability of the soluble ball seat, and improves the performance of the soluble ball seat to a certain extent. The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (5)
1. The utility model provides a soluble ball seat structure of split formula suitable for volume fracturing usefulness, includes tail vertebra (2), abrasionproof off-set nail (3), metal seal ring (4), spacer ring (5), spacer ring up end (15), slips lower extreme face (16), slips base member (7), slips up end (9), crashproof ring lower extreme face (10), crashproof ring (11) and lock sleeve (14) that from the top down connects gradually, its characterized in that: the metal sealing ring (4) is internally provided with a rubber sealing ring (13) for sealing together, the slip base body (7) is axially provided with slip blocks (8), and the slip base body (7) is split and connected together through a rubber hoop (6);
the upper end face (15) of the spacer ring is matched with the lower end face (16) of the slip in a plane, the diameter of the spacer ring (5) is enlarged in the setting process, and the slip base body (7) is opened in the radial direction; the tearing force generated in the diameter expanding process of the slip base body (7) is born by the spacer ring (5), the axial force is transmitted to the metal sealing ring (4) through the upper end face (15) of the spacer ring and the lower end face of the spacer ring, and the metal sealing ring (4) is prevented from being deformed due to the action of the tearing force in the diameter expanding process.
2. A split soluble ball seat structure suitable for volumetric fracturing according to claim 1, characterized in that the inner surface of the caudal vertebra (2) is connected with the outer surface of the locking sleeve (14), in particular: the inner diameter surface of the tail cone (2) is connected with the outer ring surface of the locking sleeve (14) through interference fit of a contact surface, and the axial displacement of the metal sealing ring (4), the spacer ring (5), the slip matrix (7) and the anti-collision ring (11) is limited by the abrupt change of the inner diameter of the tail cone (2).
3. The split type soluble ball seat structure for volume fracturing according to claim 1, wherein the upper end face (9) of the slip is matched with the lower end face (10) of the anti-collision ring through surface contact, so that the force application uniformity of the anti-collision ring (11) to the slip base body (7) in the setting process is ensured; the upper part circumference of the slip matrix (7) is provided with an embedded slip block (8) so that the contact stress with the casing is more uniform.
4. A split soluble ball seat structure suitable for volumetric fracturing according to claim 1, wherein the slip segments (8) are beveled and the slip segments (8) point down the ball seat facilitating anchoring of the slips.
5. The split type soluble ball seat structure for volumetric fracturing according to claim 1, wherein anti-wear offset nails (3) are uniformly arranged in the circumferential direction of the anti-collision ring (11) and play a role in preventing the ball seat from being worn in the process of entering the well and guaranteeing the outer diameter size of the ball seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210657134.5A CN114941514B (en) | 2022-06-10 | 2022-06-10 | Split type soluble ball seat structure suitable for volume fracturing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210657134.5A CN114941514B (en) | 2022-06-10 | 2022-06-10 | Split type soluble ball seat structure suitable for volume fracturing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114941514A CN114941514A (en) | 2022-08-26 |
| CN114941514B true CN114941514B (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210657134.5A Active CN114941514B (en) | 2022-06-10 | 2022-06-10 | Split type soluble ball seat structure suitable for volume fracturing |
Country Status (1)
| Country | Link |
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| CN (1) | CN114941514B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114941514A (en) | 2022-08-26 |
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