CN110905443B - Soluble metal sealing fracturing bridge plug - Google Patents

Soluble metal sealing fracturing bridge plug Download PDF

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Publication number
CN110905443B
CN110905443B CN201911225958.XA CN201911225958A CN110905443B CN 110905443 B CN110905443 B CN 110905443B CN 201911225958 A CN201911225958 A CN 201911225958A CN 110905443 B CN110905443 B CN 110905443B
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CN
China
Prior art keywords
metal sealing
bridge plug
supporting shaft
central supporting
setting
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CN201911225958.XA
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Chinese (zh)
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CN110905443A (en
Inventor
熊伟
刘瑛
刘恩洋
赵严
于思荣
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China University of Petroleum UPC East China
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China University of Petroleum UPC East China
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Priority to CN201911225958.XA priority Critical patent/CN110905443B/en
Publication of CN110905443A publication Critical patent/CN110905443A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/134Bridging plugs
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25Methods for stimulating production
    • E21B43/26Methods for stimulating production by forming crevices or fractures

Abstract

The invention belongs to the technical field of oil and gas field development, and particularly relates to a soluble metal sealing fracturing bridge plug. The self-locking type hydraulic self-locking device comprises a central supporting shaft, a metal sealing sleeve, a wedge body, a safety pin, a slip assembly, a setting joint and a locking ring, wherein the central supporting shaft, the metal sealing sleeve, the wedge body, the slip assembly and the setting joint are sequentially installed from top to bottom, and the locking ring is installed at a one-way locking thread on the surface of a cylindrical block body of the setting joint. The invention can realize full-bore production after fracturing operation is finished, the metal sealing sleeve deforms uniformly, contact stress between the bridge plug metal sealing sleeve and the sleeve after setting is increased, sealing is reliable, failure is not easy to occur, a dissolving product cannot block a shaft, advanced setting caused by blocking in the process of putting the bridge plug into the well can be prevented, advanced deblocking cannot occur after setting the bridge plug, the integral structure is simple, the number of parts is small, and the risk of problems in underground operation of the bridge plug is reduced.

Description

Soluble metal sealing fracturing bridge plug
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to a soluble metal sealing fracturing bridge plug.
Background
Bridge plugs are downhole tools used in horizontal well staged fracturing techniques to temporarily pack off wellbores. Depending on the manner of unsealing, bridge plugs can be classified into retrievable, drillable and dissolvable bridge plugs. The fishing cost of the removable bridge plug is high, and the failure risk is large; when the amount of chips generated during drilling and milling of the drillable bridge plug is large, the chips are accumulated to block the casing pipe, and the subsequent operation is adversely affected; the soluble bridge plug is a novel bridge plug made of magnesium aluminum alloy, and can be automatically dissolved in a certain liquid environment after fracturing operation is completed, so that full-drift-diameter production of a shaft is realized. At present, sealing elements of soluble bridge plug tools developed by oil clothing companies at home and abroad are all made of rubber materials, the temperature resistance and the pressure resistance of a soluble rubber barrel sealing element are poor, a dissolving product of the rubber materials often causes blockage of a shaft, and meanwhile, the structure of a conventional soluble bridge plug is complex and the operation failure probability is high, so that the soluble bridge plug cannot be temporarily applied in a large scale at present.
Disclosure of Invention
The invention aims to solve the problems mentioned in the background technology, and provides a soluble metal sealing fracturing bridge plug, which adopts the following technical scheme:
the utility model provides a soluble metal seal fracturing bridging plug, includes central back shaft, metal seal sleeve, wedge, safety pin, slips subassembly, setting joint and locking ring, wherein central back shaft is located the uppermost of a complete set of device, metal seal sleeve installs in the central back shaft outside, the wedge is installed in the central back shaft outside through low-strength safety pin, is located metal seal sleeve below, slips subassembly is installed in central back shaft and wedge outside, is located the wedge below, the setting joint is installed in the central back shaft outside, is located slips subassembly below, the locking ring is installed in the one-way locking thread department of setting joint cylinder block surface.
The central support shaft is made of high-strength soluble magnesium-aluminum alloy, the upper portion of the central support shaft is provided with a guide round table for guiding the sealing body to be wedged, the lower portion of the central support shaft is provided with six fan-shaped insert rods, an axial hollow channel is formed in the lower portion of the central support shaft, and one-way locking threads are arranged on the inner walls of the fan-shaped insert rods at the lower end of the central support shaft.
The metal sealing sleeve is made of soluble magnesium-lithium alloy and is of a cylindrical structure, the front part of the inner surface of the metal sealing sleeve is an inner conical surface matched with the upper guiding circular table of the central supporting shaft, the rear part of the inner surface of the metal sealing sleeve is a cylindrical surface matched with the central supporting shaft, and three rings of sealing ring protrusions are arranged on the outer surface of the metal sealing sleeve.
The wedge body is made of high-strength soluble magnesium-aluminum alloy, an axial hollow channel is arranged in the wedge body, and eight wedge grooves are formed in the surface of the wedge body.
The slip assembly comprises a slip, a hoop and an anchoring buckle, wherein the slip is made of high-strength soluble magnesium-aluminum alloy, the front part of the inner surface is a conical surface matched with a wedge-shaped groove of a wedge-shaped body, the rear part of the inner surface of the slip is a cylindrical surface matched with the surface of the central supporting shaft, two annular grooves are formed in the outer surface of the slip, the hoop is installed in the annular groove in the outer surface of the slip and fixes eight slips together and is installed on the wedge-shaped body, a stress groove is formed in the inner surface of the hoop, the anchoring buckle is installed on the outer surface of the slip, and the material is ceramic.
The integral structure of the setting joint comprises two parts, wherein one part is a cylindrical block body matched with the inner surface of the locking ring, the other part is a disc body matched with the fan-shaped inserted rod at the lower part of the central supporting shaft, an axial channel is arranged in the disc body, internal threads are arranged at the front part of the axial channel, one-way locking threads matched with the inner surface of the locking ring are arranged on the outer surface of the cylindrical block body, and a fan-shaped hole is formed in the disc body.
The locking ring open-loop structure is provided with unidirectional locking threads on the inner surface and the outer surface, and the thread pitch of the inner surface is larger than that of the outer surface.
The outer surface of the metal sealing sleeve is provided with three rings of sealing ring protrusions for improving the contact stress between the metal sealing sleeve and the sleeve after the bridge plug is set.
The locking mechanism consisting of the one-way locking threads on the inner surface of the fan-shaped inserted rod of the central support shaft, the locking ring and the one-way locking threads on the surface of the cylindrical block body of the setting joint enables the setting joint to move only in one direction along the central support shaft under the setting force.
The outer wall of the slip component is inlaid with a plurality of anchoring buckles, and the anchoring buckles can be embedded into the sleeve under the action of the setting force, so that the bearing performance of the bridge plug is guaranteed.
The inner surface of the hoop in the annular groove on the outer surface of the slip assembly is provided with a stress groove for the slip assembly to be uniformly opened under the action of the setting force, so that the anchoring buckle is uniformly meshed with the casing.
The length of the one-way locking sawtooth on the outer surface of the cylindrical block surface of the setting joint is half of the total length of the cylindrical block, so that the processing is convenient, the height of the fan-shaped hole on the disc of the setting joint is higher than the height of the fan-shaped section of the fan-shaped inserting rod on the central supporting shaft, and the wear of the friction generated by the axial movement of the setting joint along the central supporting shaft to the one-way locking structure inside the fan-shaped inserting rod on the central supporting shaft is reduced.
The setting tool may be connected to the bridge plug by internal threads provided in the axial passage of the setting nipple.
The invention has the following advantages: the metal sealing sleeve of the bridge plug adopts soluble magnesium-lithium alloy with good plasticity, full-bore production can be realized after fracturing operation is finished, the inner surface of the metal sealing sleeve consists of a conical surface and a cylindrical surface, the conical surface is matched with a guide circular table at the upper part of a central support shaft, the cylindrical surface is matched with the cylindrical outer surface of the central support shaft, and a metal sealing element is abutted against the end surface of a wedge body, so that the metal sealing sleeve is stressed uniformly when being wedged into a gap between the guide circular table of the central support shaft and a sleeve under the action of setting force, the metal sealing sleeve deforms uniformly, the contact stress between the metal sealing sleeve of the bridge plug after setting and the sleeve can be increased by a sealing ring protruding structure on the outer surface of the metal sealing sleeve, the sealing is reliable, meanwhile, the metal sealing sleeve has higher strength compared with the traditional rubber sleeve sealing assembly, is not easy to fail, and a dissolved product cannot block a shaft, the wedge can prevent through low strength safety pin connection with central back shaft that the bridging plug from meeting the setting in advance that hinders the result in the in-process that goes into the pit under, the locking ring makes the setting connect can only be provided with the one end removal of guide round platform to central back shaft along the axial for central back shaft, the setting connects can not fall into the pit shaft under the effect of pressure differential in the pit, the deblocking in advance can not take place after the bridging plug sets up, the sealed fracturing bridging plug overall structure of soluble metal is simple, part is small in quantity, the risk that the operation goes wrong in the pit of bridging plug has been reduced.
Drawings
FIG. 1: the overall structure schematic diagram of the soluble metal sealing fracturing bridge plug;
FIG. 2: a structural explosion schematic diagram of a soluble metal sealing fracturing bridge plug;
FIG. 3: the internal structure schematic diagram of the soluble metal sealing fracturing bridge plug;
FIG. 4: the structural schematic diagram of the central supporting shaft;
FIG. 5: the structure schematic diagram of the other visual angle of the central supporting shaft;
FIG. 6: a structural schematic diagram of a setting joint;
FIG. 7: a schematic structural view of another view angle of the setting joint;
FIG. 8: the three-dimensional structure of the setting joint is schematic.
1. The self-locking type hydraulic self-locking device comprises a central support shaft, 11, a guide circular table, 12, a fan-shaped insert rod, 2, a metal sealing sleeve, 21, a sealing ring protrusion, 3, a wedge-shaped body, 31, a wedge-shaped groove, 4, a safety pin, 5, a slip assembly, 51, a hoop, 52, an anchoring buckle, 6, a setting joint, 61, internal threads, 62, one-way locking threads and 7, a locking ring.
Detailed Description
The invention is further illustrated by the following figures and examples:
in the following description, reference is made to the working mode, with the end near the bottom of the well being the lower end and the end near the wellhead being the upper end. When the structure of the bridge plug is described, the direction of the central support shaft 1 guiding the circular truncated cone 11 is taken as the upper end, and the direction of the fan-shaped inserting rod 12 of the central support shaft 1 is taken as the lower end.
As shown in fig. 1-8, the soluble metal sealing fracturing bridge plug of the invention comprises a central support shaft 1, a metal sealing sleeve 2, a wedge 3, a safety pin 4, a slip component 5, a setting joint 6 and a locking ring 7, wherein the central support shaft 1 is positioned at the uppermost part of the whole set of device, the central support shaft 1 is made of high-strength soluble magnesium aluminum alloy, the upper part is provided with a guide circular table 11 for guiding a sealing body to wedge in, the lower part is provided with six fan-shaped insertion rods 12, an axial hollow channel is arranged inside the central support shaft, the inner wall of the fan-shaped insertion rod 12 at the lower end of the central support shaft 1 is provided with a one-way locking thread, the metal sealing sleeve 2 is arranged outside the central support shaft 1, the metal sealing sleeve 2 is made of soluble magnesium lithium alloy and is in a cylindrical structure, the front part of the inner surface of the metal sealing sleeve 2 is an inner conical surface matched with the guide circular table 11 at the upper part of the central support shaft 1, the back part of the inner surface of the metal sealing sleeve 2 is a cylindrical surface matched with the central supporting shaft 1, three rings of sealing ring protrusions 21 are arranged on the outer surface of the metal sealing sleeve 2, the wedge body 3 is arranged outside the central supporting shaft 1 through a low-strength safety pin 4 and is positioned below the metal sealing sleeve 2, the wedge body 3 is made of high-strength soluble magnesium aluminum alloy, an axial hollow channel is arranged in the wedge body, eight wedge grooves 31 are formed in the surface of the wedge body 3, the slip assembly 5 is arranged outside the central supporting shaft 1 and the wedge body 3 and is positioned below the wedge body 3, the slip assembly 5 comprises slips, a hoop 51 and an anchoring buckle 52, the slips are made of high-strength soluble magnesium aluminum alloy, the front part of the inner surface is a conical surface matched with the wedge grooves 31 of the wedge body 3, the back part of the inner surface of the slips is a cylindrical surface matched with the surface of the central supporting shaft 1, and two annular grooves are formed in the outer surface, wherein the hoop 51 is installed in the ring channel of slips surface to together eight slips are fixed, and install on the wedge 3, hoop 51 internal surface is equipped with the stress groove, and wherein the anchoring knot 52 is installed in the surface of slips, and the material is pottery, the setting connects 6 and installs in the center back shaft 1 outside, is located slips subassembly 5 below, and setting connects 6 overall structure includes two parts, partly be with the cylinder block of locking ring 7 internal surface complex, partly be with the disc body of center back shaft 1 lower part fan-shaped inserted bar 12 complex, the inside is equipped with axial passage, and axial passage anterior part is equipped with internal thread, the cylinder block outward appearance be provided with locking ring 7 internal surface complex one-way locking screw thread 62, be equipped with the hole on the disc body, setting connects 6 through the fan-shaped hole with the cooperation of center back shaft 1 lower extreme fan-shaped inserted bar 12, and abuts the slip assembly 5.
The locking mechanism is composed of the one-way locking thread on the inner surface of the fan-shaped inserted rod 12 of the central support shaft 1, the locking ring 7 and the one-way locking thread 62 on the surface of the cylindrical block body of the setting joint 6, so that the setting joint 6 can only move in one way along the central support shaft 1 under the action of setting force, the length of the one-way locking thread 62 is half of the total length of the cylindrical block body, the processing of the one-way locking thread 62 on the outer surface of the cylindrical block body of the setting joint 6 is facilitated, the height of the sector hole on the disc body of the setting joint 6 is higher than the sectional sector height of the fan-shaped inserted rod 12 at the bottom of the central support shaft 1, the one-way locking thread in the fan-shaped inserted rod 12 at the bottom of the central support shaft 1 is reduced by friction generated by the axial movement of the setting joint 6 along the central support shaft 1, as shown in figure 8, the front half part of the internal channel of the setting joint 6 is an internal thread 61, the bridge plug is connected to the setting tool by internal threads 61 during setting.
After fracturing operation is finished, the central support shaft 1, the metal sealing sleeve 2, the wedge body 3, the safety pin 4, the slip assembly 5, the setting joint 6 and the locking ring 7 are all soluble in a KCl liquid environment, so that full-drift-diameter production of a shaft can be realized.
The assembly process of the invention is that a metal sealing sleeve 2 and a wedge 3 are sleeved under a guide circular truncated cone 11 of a central support shaft 1 in sequence, the wedge 3 is connected with the central support shaft 1 through a safety pin 4, the metal sealing sleeve 2 is connected with the central support shaft 1 in an interference fit manner, then a slip assembly 5 and a setting joint 6 are installed, the slip assembly 5 is sleeved on the central support shaft 1 and is overlapped with the wedge 3, a locking ring 7 is installed at a one-way locking thread 62 on the surface of a cylindrical block of the setting joint 6, a fan-shaped inserted rod 12 at the lower end of the central support shaft 1 is inserted into a fan-shaped hole of the setting joint 6, the setting joint 6 is pushed to prop against the slip assembly 5, and due to a locking mechanism consisting of the one-way locking thread on the inner surface of the fan-shaped inserted rod 12 of the central support shaft, the locking ring 7 and the one-way locking thread 62 on the surface of the cylindrical block of the setting joint 6, the setting joint 6 does not fall off from the lower end of the central support shaft 1.
The working principle and the using process of the invention are as follows: the setting tool is connected with the bridge plug through the internal thread 61 of the setting joint 6 and then is pumped to a preset underground position through a coiled tubing or a cable hydraulic pump, the setting joint 6 is lifted through hydraulic pressure generated by the setting tool, the central support shaft 1 is pressed downwards, the setting joint 6 moves upwards under the opposite action force, so that the slip assembly 6 is pushed to open the occluded casing to play an anchoring role, the safety pin 4 is sheared along with further improvement of setting force, the metal sealing casing 2 is wedged into an annular space between the bridge plug and the casing along the guide circular truncated cone 11 at the upper end of the central support shaft 1, and when the setting force reaches the shearing force value of the internal thread 61 of the setting joint 6, the setting tool is separated from the bridge plug to realize releasing setting.

Claims (7)

1. A soluble metal sealing fracturing bridge plug is characterized in that: the device comprises a central supporting shaft (1), a metal sealing sleeve (2), a wedge body (3), a safety pin (4), a slip assembly (5), a setting joint (6) and a locking ring (7), wherein the central supporting shaft (1) is positioned at the uppermost part of the whole device, the metal sealing sleeve (2) is arranged at the outer side of the central supporting shaft (1), the wedge body (3) is arranged at the outer side of the central supporting shaft (1) through the low-strength safety pin (4) and positioned below the metal sealing sleeve (2), the slip assembly (5) is arranged at the outer sides of the central supporting shaft (1) and the wedge body (3) and positioned below the wedge body (3), the slip assembly (5) comprises a slip, a hoop (51) and an anchoring cylindrical surface buckle (52), the slip is made of high-strength soluble magnesium-aluminum alloy, the front part of the inner surface is a conical surface matched with a wedge groove (31) of the wedge body (3), and the rear part of the inner surface of the slip is matched with the surface of the central supporting shaft (1), the outer surface of the slip is provided with two annular grooves, wherein a hoop ring (51) is arranged in the annular groove on the outer surface of the slip and fixes eight slips together and is arranged on the wedge-shaped body (3), a stress groove is arranged on the inner surface of the hoop ring (51), an anchoring buckle (52) is arranged on the outer surface of the slip and is made of ceramics, a setting joint (6) is arranged on the outer side of a central supporting shaft (1) and is positioned below a slip component (5), a locking ring (7) is arranged at a one-way locking thread (62) on the surface of a cylindrical block body of the setting joint (6), the integral structure of the setting joint (6) comprises two parts, one part is a cylindrical block body matched with the inner surface of the locking ring (7), the other part is a circular disc body matched with a fan-shaped inserted rod (12) on the lower part of the central supporting shaft (1), an axial channel is arranged inside, and the front part of the axial channel is provided with an internal thread, the outer surface of the cylindrical block body is provided with a one-way locking thread (62) matched with the inner surface of the locking ring (7), and the disc body is provided with a sector hole.
2. The soluble metal sealing fracturing bridge plug of claim 1, wherein: the central supporting shaft (1) is made of high-strength soluble magnesium-aluminum alloy, the upper part of the central supporting shaft is provided with a guide circular truncated cone (11) for guiding the sealing body to be wedged, the lower part of the central supporting shaft is provided with six fan-shaped inserting rods (12), an axial hollow channel is arranged in the central supporting shaft, and the inner wall of each fan-shaped inserting rod (12) at the lower end of the central supporting shaft (1) is provided with one-way locking threads.
3. The soluble metal sealing fracturing bridge plug of claim 1, wherein: the metal sealing sleeve (2) is made of soluble magnesium-lithium alloy and is of a cylindrical structure, the front part of the inner surface of the metal sealing sleeve (2) is an inner conical surface matched with the upper guide circular table (11) of the central support shaft (1), the rear part of the inner surface of the metal sealing sleeve (2) is a cylindrical surface matched with the central support shaft (1), and three rings of sealing ring protrusions (21) are arranged on the outer surface of the metal sealing sleeve (2).
4. The soluble metal sealing fracturing bridge plug of claim 1, wherein: the wedge body (3) is made of high-strength soluble magnesium-aluminum alloy, an axial hollow channel is arranged in the wedge body, and eight wedge grooves (31) are formed in the surface of the wedge body (3).
5. The soluble metal sealing fracturing bridge plug of claim 1, wherein: the locking ring (7) is of an open-loop structure, unidirectional locking threads are arranged on the inner surface and the outer surface of the locking ring, and the thread pitch of the inner surface is larger than that of the outer surface of the locking ring.
6. The soluble metal sealing fracturing bridge plug of claim 1, wherein: the locking mechanism is composed of one-way locking threads on the inner surface of a fan-shaped insert rod (12) of the central support shaft (1), a locking ring (7) and one-way locking threads on the surface of a cylindrical block of the setting joint (6).
7. The soluble metal sealing fracturing bridge plug of claim 1, wherein: the length of the one-way locking sawteeth on the outer surface of the cylindrical block surface of the setting joint (6) is half of the total length of the cylindrical block, and the height of the fan-shaped hole on the disc of the setting joint (6) is higher than the height of the fan-shaped section of the fan-shaped inserted rod (12) on the central support shaft (1).
CN201911225958.XA 2019-12-04 2019-12-04 Soluble metal sealing fracturing bridge plug Active CN110905443B (en)

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112240176B (en) * 2020-09-15 2022-11-08 重庆交通大学 Soluble bridge plug
CN112576219A (en) * 2020-12-04 2021-03-30 中石化石油工程技术服务有限公司 Rubber-cylinder-free fully-soluble bridge plug, setting connection tool thereof and use method
CN112576220A (en) * 2020-12-04 2021-03-30 中石化石油工程技术服务有限公司 Large-drift-diameter expansion type fully-soluble bridge plug, setting connection tool thereof and use method

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US6613720B1 (en) * 2000-10-13 2003-09-02 Schlumberger Technology Corporation Delayed blending of additives in well treatment fluids
CN107620586A (en) * 2016-07-13 2018-01-23 中国石油化工股份有限公司 The apparatus and method for simulating Abrasion properties of the proppant in crack
CN108412475A (en) * 2018-05-11 2018-08-17 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 A kind of press-fracturing bridge plug
CN109577910A (en) * 2019-02-01 2019-04-05 天津凯英莱克机电技术有限公司 A kind of solvable bridge plug of all-metal pressure break
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CN110513076A (en) * 2019-09-24 2019-11-29 中国石油集团西部钻探工程有限公司 The solvable bridge plug of pressure break metal sealing

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