CN116816318A - Underground fracturing tool - Google Patents
Underground fracturing tool Download PDFInfo
- Publication number
- CN116816318A CN116816318A CN202210278733.6A CN202210278733A CN116816318A CN 116816318 A CN116816318 A CN 116816318A CN 202210278733 A CN202210278733 A CN 202210278733A CN 116816318 A CN116816318 A CN 116816318A
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- Prior art keywords
- ball seat
- sleeve
- soluble
- fracturing
- setting
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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
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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
- 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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/04—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion
- E21B23/0414—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells operated by fluid means, e.g. actuated by explosion using explosives
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
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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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
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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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/08—Down-hole devices using materials which decompose under well-bore conditions
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)
- Pivots And Pivotal Connections (AREA)
- Quick-Acting Or Multi-Walled Pipe Joints (AREA)
Abstract
The invention provides an underground fracturing tool which comprises an outer sleeve, a soluble ball seat and a setting component for setting the soluble ball seat into the outer sleeve, wherein the soluble ball seat comprises a ball seat body and a pressure-holding ball preset in the ball seat body; the ball seat body is provided with a limiting part in limiting fit with the outer sleeve and an elastic part for driving the limiting part to radially stretch out and draw back; when the soluble ball seat is lowered, the elastic part is connected with the setting part in a contracted shape, and the outer diameter of the limiting part is smaller than the inner diameter of the outer sleeve; when the soluble ball seat needs to be hung, the elastic component is separated from the setting component and expands outwards in the radial direction, and the outer diameter of the limiting part is larger than the inner diameter of the outer sleeve. The invention has the advantages of quick and safe setting, simple structure, small potential safety hazard and the like.
Description
Technical Field
The invention relates to the field of oil and gas fracturing yield increase, in particular to an underground fracturing tool.
Background
In the development process of unconventional oil gas resources such as compact oil gas, shale gas and the like, the bridge plug perforation combined operation process is an important means for increasing yield and improving recovery ratio, and has the advantages of realizing large-displacement and large-scale volume fracturing and the like. The quality and performance of the bridge plug determine the success and failure of fracturing operation and also influence the reservoir development effect, the existing bridge plug is gradually developed from a cast iron bridge plug and an easy-to-drill bridge plug to a soluble bridge plug, the main body part of the soluble bridge plug is dissolved in the underground environment after the fracturing operation is finished, the difficult drilling problem of the conventional bridge plug is well solved, but the existing soluble bridge plug still has the following problems: (1) The bridge plug is complex in setting structure, the risk of pre-setting exists in the process of putting in, and the difficulty of post-treatment of the pre-setting is high; (2) Bridge plug setting requires a setting tool to provide a large load, and the setting is incomplete; (3) Ceramic particles or hard alloy inlaid on the bridge plug slips are insoluble, and remain in the well in the later period, so that potential safety hazards exist; (4) The bridge plug is limited by the structure, has small inner diameter and is not beneficial to post-pressing liquid discharge production.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art and providing the underground fracturing tool which is fast and safe to drop in, reliable to set, simple in structure and small in potential safety hazard.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the underground fracturing tool comprises an outer sleeve, a soluble ball seat and a setting component for setting the soluble ball seat into the outer sleeve, wherein the soluble ball seat comprises a ball seat body and a pressure-holding ball preset in the ball seat body; the ball seat body is provided with a limiting part in limiting fit with the outer sleeve and an elastic part for driving the limiting part to radially stretch out and draw back; when the soluble ball seat is lowered, the elastic part is connected with the setting part in a contracted shape, and the outer diameter of the limiting part is smaller than the inner diameter of the outer sleeve; when the soluble ball seat needs to be hung, the elastic component is separated from the setting component and expands outwards in the radial direction, and the outer diameter of the limiting part is larger than the inner diameter of the outer sleeve.
As a further improvement of the above technical scheme:
the outer sleeve comprises a sleeve body and a fracturing matching component connected with the sleeve body, wherein the fracturing matching component comprises an outer sleeve, an inner sliding sleeve, a sliding sleeve shear pin, a first soluble protective sleeve and a second soluble protective sleeve, wherein a fracturing hole is formed in the outer sleeve, the inner sliding sleeve is installed at the position of the fracturing hole through the sliding sleeve shear pin, and the inner sliding sleeve is arranged at the position of the fracturing hole when the sliding sleeve shear pin is sheared off so as to open the fracturing hole; the first soluble protective sleeve and the second soluble protective sleeve are respectively and limitedly installed at two ends of the inner sliding sleeve and degrade after well cementation operation, so that a sitting and hanging groove which is in limit fit with the limiting part and an avoidance groove which provides a downward moving space of the inner sliding sleeve are formed.
The coat comprises a coat body, an upper joint and a lower joint, wherein the upper joint and the lower joint are connected to two ends of the coat body, the sitting and hanging groove is formed by encircling the upper joint and the inner sliding sleeve, and the avoiding groove is formed by encircling the lower joint and the inner sliding sleeve.
The outer sleeve comprises at least two split sections, a fit clearance which is in limit fit with the limit part is reserved between every two adjacent split sections, and the adjacent split sections are connected through a coupling.
One end of the setting component, which is far away from the soluble ball seat, is connected with a perforating gun for perforating the outer casing, and the perforating gun is connected with a cable for pumping the soluble ball seat.
The elastic member includes a plurality of elastic ribs; a plurality of the elastic ribs are arranged at intervals along the circumference of the soluble ball seat so as to leave a contraction space when the elastic member is connected with the setting member.
And a positioning piece is arranged between the elastic rib and the setting component, the positioning piece is positioned on one side of the limiting part, which is close to the setting component, and the positioning piece is sheared when the soluble ball seat needs to be set and hung.
The setting component comprises an outer positioning sleeve and an inner positioning shaft which are sleeved with each other, and the positioning piece is arranged between the outer positioning sleeve and the elastic rib; the elastic rib is abutted against the end face of the inner positioning shaft.
The lower end of the ball seat body is provided with a rubber bowl for sealing an annular space between the soluble ball seat and the outer sleeve.
At least two soluble ball seats are arranged at intervals along the axial direction of the outer sleeve; the inner side surface of the lower end of the ball seat body is provided with a plurality of backflow grooves for backflow of liquid after fracturing, and the backflow grooves are arranged at intervals along the circumferential direction of the ball seat body.
Compared with the prior art, the invention has the advantages that:
(1) According to the invention, the ball seat body is provided with the limiting part and the elastic part, the elastic part drives the limiting part to radially stretch, the elastic part is connected with the setting part in a shrinkage shape in the process of putting the soluble ball seat into the well, and the outer diameter of the limiting part is smaller than the inner diameter of the outer sleeve, so that the soluble ball seat can be smoothly and rapidly put into the well, the risk of putting the soluble ball seat into the well in advance is avoided, and the safety and reliability of putting the soluble ball seat into the well are high; meanwhile, when the soluble ball seat needs to be hung, the elastic component is separated from the setting component and expands radially outwards, the outer diameter of the limiting part is larger than the inner diameter of the outer sleeve, and at the moment, the limiting part can be in limiting fit with the outer sleeve to realize quick locking. Therefore, the invention ensures that the soluble ball seat can be smoothly and reliably put in, realizes the reliable and effective setting of the soluble ball seat during fracturing, and simultaneously avoids the problems of complex structure and complex operation of the existing slip anchoring bridge plug, and has simple structure and simple and convenient operation.
(2) The invention adopts the form of limit fit of the limit part and the outer sleeve, so that the soluble ball seat can be effectively set without the mode of extruding the setting and hanging mechanism and the rubber cylinder, the required setting and hanging load is small, the adaptability to the setting and hanging tool is strong, and the reliability of setting and hanging construction is high.
(3) The invention adopts the soluble ball seat, so that the tool can be completely dissolved or degraded after fracturing, thereby realizing the full diameter in the well, having no need of other salvage operations, convenient operation and low cost, and effectively meeting the operation requirements of infinite level and full diameter of unconventional oil and gas reservoirs; meanwhile, the phenomena that the slip insoluble materials are left in the well and the high-strength materials damage the casing are effectively avoided, and the potential safety hazard in the later stage of fracturing is greatly reduced.
(4) The invention adopts the form of the soluble ball seat, so that the internal drift diameter is large, the liquid flowback can be facilitated, the problem that the internal diameter of the bridge plug is limited by the existing slip structure is small is avoided, the direct liquid discharge and production operation after the pressure is convenient, and meanwhile, the operation pipe column can be allowed to comprehensively treat the shaft in the later stage.
(5) According to the invention, the pressure-holding ball is preset in the ball seat body and is put into the ball seat body together with the ball seat body, so that the fracturing operation can be directly carried out on the soluble ball seat after locking and sitting without throwing the ball at a wellhead, the operation procedure is simplified, the liquid for pumping the pressure-holding ball is saved, and the operation time is shortened.
Further, the invention is provided with the fracturing matching component connected with the sleeve body, the soluble ball seat can be matched with the fracturing matching component for use, and in particular, the soluble ball seat can be in limit fit with the hanging groove of the fracturing matching component, so that quick setting is realized; meanwhile, when the second soluble protective sleeve is degraded and the sliding sleeve shear pin is sheared, the sliding sleeve can open the fracturing hole downwards to implement fracturing operation, so that the problem that the existing mode needs to adopt perforation to rob perforation procedures is solved, procedures are saved, and the operation is convenient; simultaneously, the inner sliding sleeve is installed on the fracturing Kong Weizhi through the sliding sleeve shear pins, and the first soluble protective sleeve and the second soluble protective sleeve are respectively and limitedly installed at two ends of the inner sliding sleeve, so that the structure is simple and compact. The underground fracturing tool can realize accurate locking of the soluble ball seat, can be matched with the fracturing matching component to implement fracturing operation, can replace a conventional bridge plug to perform staged fracturing operation, and further improves safety, reliability and rapidness of fracturing construction operation.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic view of the structure of a soluble tee of the present invention.
FIG. 2 is a schematic representation of the mating relationship of the soluble ball seat of the present invention with a setting member.
Fig. 3 is a schematic diagram of the structure of the downhole fracturing tool of example 1 of the present invention (soluble ball seat in well).
Fig. 4 is a schematic structural view of the downhole fracturing tool of embodiment 1 of the invention (soluble ball seat set-up state).
Fig. 5 is a schematic diagram of the structure of a downhole fracturing tool (soluble ball seat in a well state) according to embodiment 2 of the present invention.
Fig. 6 is a schematic diagram of the structure of the downhole fracturing tool of embodiment 2 of the invention (soluble ball seat set-up).
FIG. 7 is a schematic structural view of the fracture mating component of the present invention.
The reference numerals in the drawings denote:
1. an outer sleeve; 11. a sleeve body; 12. a fracturing mating component; 121. a jacket; 1211. a jacket body; 1212. an upper joint; 1213. a lower joint; 122. an inner sliding sleeve; 123. sliding sleeve shear pins; 124. a first soluble guard; 125. a second soluble guard; 126. fracturing the hole; 127. a sitting and hanging groove; 128. avoiding the groove; 129. a seal ring; 13. a split section; 14. a fit gap; 15. coupling; 2. a soluble ball seat; 21. a ball seat body; 22. a pressing ball is pressed; 23. a limit part; 24. an elastic member; 241. an elastic rib; 25. a positioning piece; 26. a rubber bowl; 27. a flowback groove; 3. a setting component; 31. an outer positioning sleeve; 32. an inner positioning shaft; 4. a perforating gun; 5. and (3) a cable.
Detailed Description
The invention will now be described in further detail with reference to the drawings and the specific examples, which are not intended to limit the scope of the invention.
Example 1
Fig. 1-4 illustrate embodiments of the downhole fracturing tool of the present invention that may be widely used in fracturing operations for various vertical, horizontal, and large displacement wells. In this embodiment, the downhole fracturing tool comprises an outer casing 1, a soluble ball seat 2 and a setting member 3 that lowers the soluble ball seat 2 into the outer casing 1. The soluble ball seat 2 comprises a ball seat body 21 and a pressure-holding ball 22, wherein the pressure-holding ball 22 is preset in the ball seat body 21. The ball seat body 21 is provided with a limiting part 23 and an elastic part 24, the limiting part 23 is in limiting fit with the outer sleeve 1 when the soluble ball seat 2 is set, and the elastic part 24 drives the limiting part 23 to radially stretch; when the soluble ball seat 2 is put down, the elastic part 24 is connected with the setting part 3 in a contracted shape, and the outer diameter of the limiting part 23 is smaller than the inner diameter of the outer sleeve 1; when the soluble ball seat 2 needs to be hung, the elastic component 24 is separated from the setting component 3 and expands radially outwards, and the outer diameter of the limiting part 23 is larger than the inner diameter of the outer sleeve 1.
According to the invention, the limit part 23 and the elastic part 24 are arranged on the ball seat body 21, the elastic part 24 drives the limit part 23 to radially stretch and contract, the elastic part 24 is connected with the setting part 3 in a shrinkage shape in the process of putting the soluble ball seat 2 in, at the moment, the outer diameter of the limit part 23 is smaller than the inner diameter of the outer sleeve 1, so that the soluble ball seat 2 can be smoothly and rapidly put in a well, the risk of putting the soluble ball seat 2 in front of the setting is avoided, and the safety and the reliability of putting in are high; meanwhile, when the soluble ball seat 2 needs to be hung, the elastic component 24 is separated from the setting component 3 and expands radially outwards, the outer diameter of the limiting part 23 is larger than the inner diameter of the outer sleeve 1, and at the moment, the limiting part 23 can be in limiting fit with the outer sleeve 1 to realize quick locking. Therefore, the invention ensures that the soluble ball seat 2 can be smoothly and reliably put in, realizes the reliable and effective setting of the soluble ball seat 2 during fracturing, and simultaneously, avoids the problems of complex structure and complex operation of the existing slip anchoring bridge plug, and has simple structure and simple and convenient operation.
The invention adopts the form of limit fit of the limit part 23 and the outer sleeve 1, so that the soluble ball seat 2 can be effectively sealed without the need of extruding a seat hanging mechanism and a rubber cylinder, the required seat hanging load is small, the adaptability to seat hanging tools is strong, and the seat hanging construction reliability is high.
The invention adopts the soluble ball seat 2, so that the tool can be completely dissolved or degraded after fracturing, thereby realizing the full diameter in the well, having no need of other salvage operations, convenient operation and low cost, and effectively meeting the operation requirements of infinite level and full diameter of unconventional oil and gas reservoirs; meanwhile, the phenomena that the slip insoluble materials are left in the well and the high-strength materials damage the casing are effectively avoided, and the potential safety hazard in the later stage of fracturing is greatly reduced.
The invention adopts the form of the soluble ball seat 2, so that the internal drift diameter is large, the liquid flowback can be facilitated, the problem that the bridge plug is limited to be small in inner diameter by the existing slip structure is avoided, the direct liquid discharge and production operation after pressing are facilitated, and meanwhile, the operation pipe column can be allowed to comprehensively treat a shaft in the later stage.
According to the invention, the pressure-holding ball 22 is preset in the ball seat body 21 and is put into the ball seat body 21 together, so that the soluble ball seat 2 can directly perform fracturing operation without throwing a ball at a wellhead after locking and hanging, the operation procedure is simplified, the liquid for pumping the pressure-holding ball 22 is saved, and the operation time is shortened.
Further, as shown in fig. 1 and 2, the elastic member 24 includes a plurality of elastic ribs 241. The plurality of elastic ribs 241 are arranged at intervals along the circumferential direction of the soluble ball seat 2, so that a shrinkage space is reserved when the elastic component 24 is connected with the setting component 3, the elastic ribs 241 are radially retracted, the outer diameter of the limiting part 23 is reduced, the soluble ball seat 2 can be smoothly and rapidly put into a well, friction between the limiting part 23 and the outer sleeve 1 is avoided when the soluble ball seat 2 is put into the well, the risk of setting the soluble ball seat 2 in advance is avoided, and the safety reliability of the putting into the well is high.
Further, a positioning piece 25 is arranged between the elastic rib 241 and the setting component 3, and the positioning piece 25 is positioned on one side of the limiting portion 23, which is close to the setting component 3. The locating piece 25 cuts when soluble ball seat 2 needs to sit and hang, makes things convenient for elastomeric element 24 to break away from setting part 3, and at this moment, elastomeric element 24 radially expands outward, and spacing portion 23 and the inner wall contact of outer tube 1 can realize quick locking with the spacing cooperation of outer tube 1 when spacing portion 23 passes through the spacing region of outer tube 1, its convenient operation, simple structure.
As shown in fig. 2, the setting member 3 includes an outer positioning sleeve 31 and an inner positioning shaft 32 which are coupled to each other. The locating piece 25 is arranged between the outer locating sleeve 31 and the elastic rib 241, and the elastic rib 241 is propped against the end face of the inner locating shaft 32, so that the position of the soluble ball seat 2 is effectively fixed when the soluble ball seat 2 is lowered, and the reliable lowering of the soluble ball seat 2 is ensured. Meanwhile, when the soluble ball seat 2 needs to be set, the outer positioning sleeve 31 shears off the positioning piece 25 under the action of gunpowder, so that releasing of the setting component 3 and the soluble ball seat 2 is realized.
Further, a rubber bowl 26 is arranged at the lower end part of the ball seat body 21 so as to seal the annular space between the soluble ball seat 2 and the outer sleeve 1, prevent fluid from entering other fracturing layers and ensure the fracturing effect. In this embodiment, a placement groove is formed on the outer surface of the ball seat body 21, and a rubber bowl 26 is disposed in the placement groove in a vulcanization manner; meanwhile, two rubber bowls 26 are arranged, and the two rubber bowls 26 are arranged at intervals along the axial direction of the ball seat body 21. In other embodiments, the number of the glue bowls 26 may be adjusted according to practical situations, such as one, three, four, etc.
In this embodiment, there are at least two soluble ball seats 2, and the soluble ball seats 2 are arranged at intervals along the axial direction of the outer sleeve 1 so as to perform fracturing operations on different strata. The inner side of ball seat body 21 lower extreme is equipped with a plurality of grooves of returning, and a plurality of grooves of returning 27 are arranged along the circumference interval of ball seat body 21 to when the back flow liquid is needed after the fracturing, when lower pressure holding ball 22 moves up to the ball seat body 21 of top, the back flow liquid accessible returns the groove of returning 27 and returns the flow liquid.
As shown in fig. 3 and 4, the outer sleeve 1 comprises at least two split sections 13, a fit gap 14 is reserved between adjacent split sections 13, and the adjacent split sections 13 are connected through a coupling 15. In this embodiment, the width of the fit gap 14 is larger than the width of the limiting portion 23, so that the limiting portion 23 can spring into the fit gap 14 when moving downward, thereby realizing positioning and locking.
In this embodiment, a perforating gun 4 is connected to the end of the setting member 3 away from the soluble ball seat 2, and the perforating gun 4 is used for perforating the outer casing 1. At the same time, perforating gun 4 is connected to cable 5 to energize perforating gun 4 while pumping soluble ball seat 2 to effect perforating operation.
In this embodiment, the ball seat 21 and the holding ball 22 are made of a soluble magnesium aluminum alloy material or a degradable polymer material such as polyglycolic acid or polylactic acid, and the bowl 26 is made of a soluble rubber material.
In this embodiment, the operation flow of the downhole fracturing tool is as follows:
(1) Assembling the perforating gun 4, the setting component 3 and the soluble ball seat 2 on the ground, and connecting the soluble ball seat 2 with the setting component 3 through a positioning piece 25; then, the outer diameter of the limiting part 23 of the soluble ball seat 2 is measured to ensure that the limiting part 23 of the soluble ball seat 2 cannot scratch the inner wall of the outer sleeve 1 when being lowered;
(2) When the cable 5 is used for pumping the setting component 3 and the soluble ball seat 2, and the soluble ball seat 2 is pumped to the upper part of the fit gap 14, the setting component 3 is started, the outer positioning sleeve 31 shears the positioning piece 25 under the action of gunpowder, at the moment, the setting component 3 and the soluble ball seat 2 are released, and the limiting part 23 of the soluble ball seat 2 is rebounded to be contacted with the inner wall of the outer sleeve 1; the pumping liquid pushes the soluble ball seat 2 to descend, and when the soluble ball seat 2 reaches the fit clearance 14, the limiting part 23 of the soluble ball seat 2 is sprung into the fit clearance 14, so that locking sitting and hanging are realized;
(3) Lifting the perforating gun 4 to a certain position, carrying out perforating operation on the outer sleeve 1 at the upper part of the soluble ball seat 2, and lifting the perforating gun 4 and the setting component 3 after perforation is finished;
(4) Repeating the steps (1) - (3) after the fracturing operation of the reservoir at the upper part of the soluble ball seat 2 is finished, and sequentially carrying out the fracturing construction operation at each stage at the upper part;
(5) After all fracturing operations are completed, liquid flowback is performed and the soluble ball seat 2 dissolves or degrades in the downhole environment.
Example 2
Fig. 5 to 7 show another embodiment of the downhole fracturing tool of the present invention, which is substantially identical to the previous embodiment, except that the present embodiment eliminates the segmented arrangement of the outer casing 1, and the outer casing 1 is arranged as a casing body 11 and a fracturing mating member 12, the fracturing mating member 12 being connected to the casing body 11. In this embodiment, the frac mating member 12 includes an outer jacket 121, an inner runner 122, a runner shear pin 123, a first soluble boot 124, and a second soluble boot 125. Wherein, the outer sleeve 121 is provided with a fracturing hole 126, the inner sliding sleeve 122 is arranged at the fracturing hole 126 through the sliding sleeve shear pin 123, and the inner sliding sleeve 122 descends to open the fracturing hole 126 when the sliding sleeve shear pin 123 is sheared; the first soluble protecting sleeve 124 and the second soluble protecting sleeve 125 are respectively and limitedly installed at two ends of the inner sliding sleeve 122 and degrade after well cementation operation, so as to form a sitting and hanging groove 127 and an avoiding groove 128, wherein the sitting and hanging groove 127 is used for being in limit fit with the limiting part 23, and the avoiding groove 128 provides a space for the inner sliding sleeve 122 to move downwards.
The invention is provided with the fracturing cooperation component 12 connected with the sleeve body 11, the soluble ball seat 2 can be matched with the fracturing cooperation component 12 for use, in particular, the soluble ball seat 2 can be in limit fit with the hanging groove 127 of the fracturing cooperation component 12, so as to realize quick setting; meanwhile, when the second soluble protective sleeve 125 is degraded and the sliding sleeve shear pin 123 is sheared, the inner sliding sleeve 122 can open the fracturing holes 126 downwards to implement fracturing operation, so that the problem that the existing mode needs to adopt perforation to rob perforation procedures is solved, procedures are saved, and the operation is convenient.
Meanwhile, the inner sliding sleeve 122 is installed at the position of the fracturing hole 126 through the sliding sleeve shear pin 123, and the first soluble protective sleeve 124 and the second soluble protective sleeve 125 are respectively and limitedly installed at two ends of the inner sliding sleeve 122, so that the structure is simple and compact. The underground fracturing tool can not only realize the accurate locking of the soluble ball seat 2, but also realize the fracturing operation by being matched with the fracturing matching component 12, and can replace the conventional bridge plug to perform staged fracturing operation, thereby further improving the safety, reliability and rapidness of the fracturing construction operation.
Further, as shown in fig. 7, the jacket 121 includes a jacket body 1211, an upper joint 1212, and a lower joint 1213. The upper connector 1212 and the lower connector 1213 are connected to two ends of the outer sleeve body 1211, the seating and hanging groove 127 is formed by enclosing the upper connector 1212 and the inner sliding sleeve 122, and the avoiding groove 128 is formed by enclosing the lower connector 1213 and the inner sliding sleeve 122, so that the structure is simple and compact, and the disassembly and the assembly are convenient.
In this embodiment, the first soluble jacket 124 and the second soluble jacket 125 are degradable polymeric materials such as polyglycolic acid, polylactic acid, etc. to prevent cement slurry from entering the fracturing mating component 12 during the cementing operation. Further, sealing rings 129 are arranged between the outer sleeve body 1211 and the inner sleeve 122, between the outer sleeve body 1211 and the upper joint 1212, and between the outer sleeve body 1211 and the lower joint 1213, so as to further prevent fluid from entering the inside of the fracturing fitting component 12; the number of the sealing rings 129 can be selected according to actual requirements.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (10)
1. The downhole fracturing tool is characterized by comprising an outer sleeve, a soluble ball seat and a setting component for lowering the soluble ball seat into the outer sleeve, wherein the soluble ball seat comprises a ball seat body and a pressure-holding ball preset in the ball seat body; the ball seat body is provided with a limiting part in limiting fit with the outer sleeve and an elastic part for driving the limiting part to radially stretch out and draw back; when the soluble ball seat is lowered, the elastic part is connected with the setting part in a contracted shape, and the outer diameter of the limiting part is smaller than the inner diameter of the outer sleeve; when the soluble ball seat needs to be hung, the elastic component is separated from the setting component and expands outwards in the radial direction, and the outer diameter of the limiting part is larger than the inner diameter of the outer sleeve.
2. The downhole fracturing tool of claim 1, wherein the outer sleeve comprises a sleeve body and a fracturing mating component connected to the sleeve body, the fracturing mating component comprising an outer sleeve, an inner sleeve, a sliding sleeve shear pin, a first soluble protective sleeve and a second soluble protective sleeve, wherein the outer sleeve is provided with a fracturing hole, the inner sleeve is mounted in the fracturing hole through the sliding sleeve shear pin, and the inner sleeve is lowered when the sliding sleeve shear pin shears to open the fracturing hole; the first soluble protective sleeve and the second soluble protective sleeve are respectively and limitedly installed at two ends of the inner sliding sleeve and degrade after well cementation operation, so that a sitting and hanging groove which is in limit fit with the limiting part and an avoidance groove which provides a downward moving space of the inner sliding sleeve are formed.
3. The downhole fracturing tool of claim 2, wherein the casing comprises a casing body, an upper joint and a lower joint, the upper joint and the lower joint are connected to two ends of the casing body, the seat-hanging groove is formed by encircling the upper joint and the inner sliding sleeve, and the avoidance groove is formed by encircling the lower joint and the inner sliding sleeve.
4. The downhole fracturing tool of claim 1, wherein said outer casing comprises at least two split segments, wherein a fit gap is left between adjacent split segments for limited fit with said limiting portion, and adjacent split segments are connected by a collar.
5. The downhole fracturing tool of claim 4, wherein an end of said setting member remote from said soluble ball seat is connected to a perforating gun that perforates an outer casing, said perforating gun being connected to a cable that pumps said soluble ball seat.
6. The downhole fracturing tool of any of claims 1-5, wherein said resilient member comprises a plurality of resilient ribs; a plurality of the elastic ribs are arranged at intervals along the circumference of the soluble ball seat so as to leave a contraction space when the elastic member is connected with the setting member.
7. The downhole fracturing tool of claim 6, wherein a positioning member is provided between the elastic rib and the setting member, the positioning member being located on a side of the limit portion near the setting member, the positioning member being sheared when the soluble ball seat is to be set.
8. The downhole fracturing tool of claim 7, wherein said setting member comprises an outer locating sleeve and an inner locating shaft that are nested with each other, said locating member being disposed between said outer locating sleeve and said resilient rib; the elastic rib is abutted against the end face of the inner positioning shaft.
9. The downhole fracturing tool of any of claims 1-4, wherein a lower end of the ball seat body is provided with a bowl for sealing off an annulus between the dissolvable ball seat and the outer casing.
10. The downhole fracturing tool of any of claims 1-4, wherein there are at least two of said soluble ball seats spaced axially along an outer casing; the inner side surface of the lower end of the ball seat body is provided with a plurality of backflow grooves for backflow of liquid after fracturing, and the backflow grooves are arranged at intervals along the circumferential direction of the ball seat body.
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| CN202210278733.6A CN116816318B (en) | 2022-03-21 | 2022-03-21 | A downhole fracturing tool |
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| CN202210278733.6A CN116816318B (en) | 2022-03-21 | 2022-03-21 | A downhole fracturing tool |
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| CN116816318B (en) | 2025-10-28 |
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Effective date of registration: 20260109 Address after: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Country or region after: China Patentee after: Sinopec Petroleum Engineering Technology Research Institute Co.,Ltd. Patentee after: SHELFOIL PETROLEUM EQUIPMENT & SERVICES Co.,Ltd. Address before: 100728 Beijing, Chaoyangmen, North Street, No. 22, No. Patentee before: CHINA PETROLEUM & CHEMICAL Corp. Country or region before: China Patentee before: Sinopec Petroleum Engineering Technology Research Institute Co.,Ltd. |