High-temperature-resistant large-drift-diameter multi-activation leaking stoppage tool

Abstract

The invention relates to the technical field of leaking stoppage tools, in particular to a high-temperature-resistant large-drift-diameter multi-activation leaking stoppage tool which comprises an upper outer cylinder, a lower outer cylinder, a limiting sleeve and a transposition sliding sleeve, the lower outer cylinder is in threaded connection with the outer side of the lower end of the upper outer cylinder, and the transposition sliding sleeve is arranged in the upper outer cylinder; the inner side of the upper end and the inner side of the lower end of the transposition sliding sleeve are in threaded connection with an upper elastic claw sleeve and a lower elastic claw sleeve respectively, the upper side of the transposition sliding sleeve is provided with a limiting sleeve, and the outer side of the limiting sleeve is in threaded connection with the inner side of the upper outer cylinder. The transposition sliding sleeve is provided with circulation holes which are communicated inside and outside and correspond to the nozzles in number. The plugging device is reasonable and compact in structure and convenient to use, the functional ball is thrown for pressure building, the index screw is matched with the transposition sliding sleeve, the transposition sliding sleeve is rotationally communicated with the nozzle and the circulating hole for plugging operation, and the spiral guide ball basket is arranged to throw a ball to a lower tool to drive the lower tool on the premise that the plugging function is not affected.

Description

Technical Field

[0001] The invention relates to the technical field of plugging tools, in particular to a high-temperature resistant, large-diameter, multi-activation plugging tool. Background Art

[0002] The plugging tool is a kind of plugging bypass tool controlled on the ground, which can realize multiple forward and lateral (bypass) alternating cycles. The commonly used plugging tool is the multiple switch circulation bypass tool. The multiple switch circulation bypass tool can selectively open and close the forward and lateral circulation channels multiple times in complex well conditions. It can carry out special operations such as high-concentration and large-particle plugging materials and cement plugging construction without drilling, shorten the drilling cycle, and reduce well control risks; realize the conversion between forward circulation and lateral circulation of drilling fluid, and reduce construction costs; it is not limited by downhole tools, instruments, and drill bit water holes, and can realize large-volume well washing, effectively protecting downhole instruments and power drilling tools; it can realize multiple downhole switch operations, reducing construction costs; at the same time, it can reduce or eliminate the cuttings bed of directional wells and horizontal well sections (remove metal burrs in time during window opening and milling operations), and has broad application prospects. The commonly used multiple switch circulation bypass tools are mainly DSI's PBL tools, Schlumberger's WELL COMMANDER, BAKER's XP circulation valve, etc. The PBL tool uses a combination of different functional balls to achieve the conversion between normal drilling, plugging while drilling, and large-volume well washing. The tool has a simple structure, is stable and reliable, but the number of tool activations is limited and only drilling fluid can pass through the tool after activation. The WELL COMMANDER tool uses functional balls and isolation balls of similar sizes to achieve the conversion between different functions of the tool. After the tool is activated, small-sized balls can still pass through the tool. The tool is powerful and has a sophisticated structure, but the number of activations is limited, the structure is relatively complex, and the operating precision requirements are high. BAKE's XP circulation valve uses three different-sized balls with multi-segment ball seat rings to achieve conversion between different functions. The tool has poor stability, high processing difficulty, and limited activation times. With the continuous deepening of the development of deep wells, ultra-deep wells, and complex process wells, the plugging while drilling process has put forward requirements for plugging tools with high temperature resistance, larger diameters, more activation times, simpler operation, and higher stability. Summary of the invention

[0003] The present invention provides a high temperature resistant large diameter multiple activation plugging tool, which overcomes the deficiencies of the above-mentioned prior art and can effectively solve the problems of the existing plugging tools such as small number of activation times, complex structure and high operation precision requirements.

[0004] The technical scheme of the present invention is realized through the following measures: a high-temperature resistant large-diameter multi-activated plugging tool, comprising an upper outer cylinder, a lower outer cylinder, a limiting sleeve, and a rotation sleeve, the outer side of the lower end of the upper outer cylinder is threadedly connected to the lower outer cylinder, and the upper outer cylinder is provided with a rotation sleeve, the inner side of the upper end and the inner side of the lower end of the rotation sleeve are respectively threadedly connected to the upper elastic claw sleeve and the lower elastic claw sleeve, the upper side of the rotation sleeve is provided with a limiting sleeve threadedly connected to the inner side of the upper outer cylinder, at least one nozzle capable of communicating with the interior is provided on the upper outer cylinder, the rotation sleeve is provided with circulation holes through the inside and outside corresponding to the number of nozzles, a rotation groove is provided in the middle part of the rotation sleeve, the upper outer cylinder is provided with an index screw with the inner end located in the rotation groove, the inner side of the lower end of the upper outer cylinder is provided with a first step, a compression spring is provided between the lower end of the rotation sleeve and the upper side of the first step, a spiral guide ball basket capable of limiting the falling of functional balls of different sizes is provided in the lower outer cylinder, and a second step is provided on the inner side of the lower end of the lower outer cylinder.

[0005] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned indexing groove may include an upper indexing groove and a lower indexing groove. There are eight identical upper indexing grooves evenly distributed along the circumference of the indexing sleeve. A lower indexing groove is provided on the indexing sleeve corresponding to the position below the upper indexing groove. The lower indexing groove includes two groups of grooves evenly distributed along the circumference of the indexing sleeve, each group of grooves includes three adjacent long grooves and one short groove, and the tooth tips formed between every two upper indexing grooves correspond to the position of the lower indexing groove.

[0006] Four cross-distributed deceleration steps are arranged at intervals up and down on the inner side of the transfer sleeve.

[0007] The above-mentioned deceleration step is a semicircular ring.

[0008] The spiral guide ball basket is in the shape of a long cylinder with a through passage in the middle. A spiral guide groove is arranged on the outer side of the spiral guide ball basket from top to bottom, and the spiral guide groove is connected with the through passage.

[0009] A first retaining ring is arranged in the upper outer cylinder corresponding to the upper side position of the limiting sleeve, and a second retaining ring is arranged in the transfer sliding sleeve corresponding to the upper side position of the upper elastic claw sleeve.

[0010] O-rings are provided between the upper outer side and lower outer side of the limit sleeve and the inner side of the upper outer cylinder, an O-ring is provided between the lower outer side of the upper elastic claw sleeve and the inner side of the indexing sleeve, a U-shaped sealing ring is provided between the upper outer cylinder and the indexing sleeve at the position above and below the nozzle, an O-ring is provided between the index screw and the upper outer cylinder, and an O-ring is provided between the upper outer side of the lower elastic claw sleeve and the indexing sleeve.

[0011] The upper elastic claw sleeve and the lower elastic claw sleeve are both made of metal.

[0012] The present invention has a reasonable and compact structure and is easy to use. By putting in a functional ball to hold the pressure, the index screw cooperates with the transfer sleeve to rotate the transfer sleeve to connect the nozzle and the circulation hole to perform the plugging operation. By setting a spiral guide ball basket, the ball is thrown to the lower tool to drive the lower tool without affecting the plugging function. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Attached Figure 1 It is a schematic diagram of the front half-section structure of an embodiment of the present invention.

[0014] Attached Figure 2 For attachment Figure 1 An enlarged cross-sectional structural diagram of the upper part.

[0015] Attached Figure 3 For attachment Figure 1 Schematic diagram of the planar unfolded structure of the transfer sleeve transfer groove.

[0016] The codes in the accompanying drawings are: 1 is an upper outer cylinder, 2 is a lower outer cylinder, 3 is a limit sleeve, 4 is a transfer sleeve, 5 is an upper elastic claw sleeve, 6 is a lower elastic claw sleeve, 7 is an index screw, 8 is a first step, 9 is a compression spring, 10 is a spiral guide ball basket, 11 is a second step, 12 is an upper transfer groove, 13 is a long groove, 14 is a short groove, 15 is a deceleration step, 16 is a spiral guide groove, 17 is a first retaining ring, 18 is a second retaining ring, 19 is an O-ring, 20 is a U-ring, 21 is a functional ball, 22 is a nozzle, and 23 is a circulation hole. DETAILED DESCRIPTION

[0017] The present invention is not limited by the following embodiments, and specific implementation methods can be determined based on the technical solution of the present invention and actual conditions.

[0018] In the present invention, for the convenience of description, the relative position relationship of each component is described according to the attached Figure 1 The positional relationships such as front, back, top, bottom, left, and right are described according to the layout directions of the drawings in the specification.

[0019] The present invention will be further described below in conjunction with embodiments and drawings: Embodiment 1: As attached Figure 1 , 2As shown in Figure 3, the high temperature resistant large-diameter multiple activation plugging tool comprises an upper outer tube 1, a lower outer tube 2, a limiting sleeve 3, and a rotation sleeve 4. The lower end of the upper outer tube 1 is threadedly connected to the lower outer tube 2 on the outer side, and the upper outer tube 1 is provided with a rotation sleeve 4. The upper inner side of the upper end and the lower inner side of the rotation sleeve 4 are respectively threadedly connected to an upper elastic claw sleeve 5 and a lower elastic claw sleeve 6. The upper side of the rotation sleeve 4 is provided with a limiting sleeve 3 threadedly connected to the inner side of the upper outer tube 1 on the outer side, and the upper outer tube 1 is provided with at least one Nozzle 22, the transfer sleeve 4 is provided with circulation holes 23 that pass through the inside and outside and correspond to the number of nozzles 22, the transfer sleeve 4 is provided with a transfer groove in the middle, the upper outer tube 1 is provided with an index screw 7 with the inner end located in the transfer groove, the inner side of the lower end of the upper outer tube 1 is provided with a first step 8, a compression spring 9 is provided between the lower end of the transfer sleeve 4 and the upper side of the first step 8, the lower outer tube 2 is provided with a spiral guide ball basket 10 that can limit the falling of functional balls 21 of different sizes, and the inner side of the lower end of the lower outer tube 2 is provided with a second step 11.

[0020] According to the requirements, there are 10 axial wire cutting grooves at the lower end of the upper elastic claw sleeve 5 and the lower elastic claw sleeve 6. After adjusting the size and ball size parameters of the upper elastic claw sleeve 5 and the lower elastic claw sleeve 6, the pressure of the functional ball 21 is: 20MPa for the upper elastic claw sleeve 5 and 15MPa for the lower elastic claw sleeve 6. There are ball seats in the upper elastic claw sleeve 5 and the lower elastic claw sleeve 6. When the pumping functional ball 21 is seated inside the upper elastic claw sleeve 5, the ball-ball seat cannot form a pressure-stabilizing seal, but as the displacement increases, the circulating pump pressure will continue to rise. When it rises to a certain value, the functional ball 21 can be squeezed through. After the functional ball 21 is squeezed through, the upper elastic claw sleeve 5 returns to its original state. The pressure value of the functional ball 21 squeezing through the ball seat can be adjusted by the initial interference between the functional ball 21 and the ball seat, and the length and width of the wire cutting groove.

[0021] In the initial state, the nozzle 22 of the upper outer cylinder 1 is misaligned with the circulation hole 23 of the transfer sleeve 4 in the axial and circumferential directions. The functional ball 21 is thrown in and pumped to the upper elastic claw sleeve 5. The pressure is held to push the transfer sleeve 4 to overcome the restoring force of the compression spring 9 and transfer downward to the bottom. The pressure is continued to be held to 20MPa to knock down the functional ball 21, which falls on the lower elastic claw sleeve 6. The pump is stopped and the pressure is released. At this time, the functional ball 21 becomes an isolation ball to prevent the plugging slurry from contaminating the drilling tool at the lower part of the tool. The transfer sleeve 4 is transferred upward under the action of the compression spring 9, and the circulation hole 23 of the transfer sleeve 4 is aligned with the nozzle 22 of the upper outer cylinder 1 to establish a circulation channel for plugging operations. After the plugging operation is completed, the second functional ball 21 is thrown in, and the transfer sleeve 4 is rotated by holding the pressure so that the nozzle 22 of the upper outer cylinder 1 and the transfer sleeve are aligned. The circulation hole 23 of sleeve 4 is misaligned in axial and circumferential directions, the circulation channel is closed, and the pressure is continued to be held to 20 MPa, the first functional ball 21 is shot down, and the second functional ball 21 is seated on the lower elastic claw sleeve 6, and the first functional ball 21 falls on the second step 11 along the spiral guide ball basket 10, and the pressure is continued to be held to 15 MPa, and the second functional ball 21 is shot down, and the second functional ball 21 falls into the lower spiral guide ball basket 10 and falls on the second step 11, and the tool returns to its initial state. The present invention realizes control of different working states of the tool through the functional ball 21 of a unique size, is not easy to operate incorrectly, and the functional ball 21 is reusable with low cost of use. It can flexibly and efficiently handle complex accidents, and provide reliable technical support for deep wells, ultra-deep wells, and complex process wells.

[0022] Smaller sized balls can enter the tool below through the spiral guide ball basket 10. Different sized balls and ball seats can be matched to connect multiple tools in the drill string to achieve selective activation and deactivation of the tools.

[0023] The above-mentioned high temperature resistant large diameter multiple activation plugging tool can be further optimized and / or improved according to actual needs: Embodiment 2: As attached Figure 1 , 2 As shown in Figure 3, the indexing groove includes an upper indexing groove 12 and a lower indexing groove. Eight identical upper indexing grooves 12 are evenly distributed along the circumference of the indexing sleeve 4. A lower indexing groove is provided on the indexing sleeve 4 corresponding to the position below the upper indexing groove 12. The lower indexing groove includes two groups of grooves evenly distributed along the circumference of the indexing sleeve 4. Each group of grooves includes three adjacent long grooves 13 and one short groove 14. The tooth tips formed between every two upper indexing grooves 12 correspond to the positions of the lower indexing grooves.

[0024] Change of position of index screw 7 during tool state transition: Position a: Initial state, the body circulation hole 23 and the index sleeve 4 circulation hole 23 are out of position in the axial and circumferential directions; Position b: throw the functional ball 21, pump it to the upper elastic claw sleeve 5, hold the pressure, push the transfer sleeve 4 to overcome the restoring force of the compression spring 9 and transfer downward to the bottom; Position c: Continue to hold the pressure to 20 MPa to knock down the functional ball 21, which is seated on the lower elastic claw sleeve 6 (to prevent the functional ball 21 from continuously passing through the upper and lower elastic claw sleeves 6), stop the pump, and release the pressure. At this time, the functional ball 21 becomes an isolation ball, which can prevent the plugging slurry from contaminating the lower drilling tool of the tool. The transfer sleeve 4 transfers upward under the action of the compression spring 9, and the circulation hole 23 of the transfer sleeve 4 is aligned with the circulation hole 23 of the body to establish a circulation channel for plugging operations; Position d: After the plugging operation is completed, the second functional ball 21 is put in and pumped to the upper elastic claw sleeve 5, and the pressure is held (the holding pressure value is less than the knock-down pressure of the functional ball 21), and the transfer sleeve 4 is pushed to overcome the restoring force of the compression spring 9 and transfer downward to the bottom; Position e: the pump is stopped, the compression spring 9 pushes the indexing sleeve 4 to index upward, the circulation hole 23 of the indexing sleeve 4 is out of position with the circulation hole 23 of the body, and the circulation channel is closed; Position f: hold the pressure and push the indexing sleeve 4 to index downward to the bottom; Position g: Continue to hold the pressure to 20 MPa, shoot down the first functional ball 21, and the first functional ball 21 falls into the spiral guide ball basket 10 below. Under the limitation of the size of the central hole of the spiral guide ball basket 10 and the guidance of the spiral groove, it slides down along the outer part of the spiral groove to the bottom, releases the pressure, and the compression spring 9 pushes the transfer sleeve 4 to transfer upward. After the second functional ball 21 is decelerated by the deceleration step 15, it is seated on the lower elastic claw sleeve 6; Position h: Pressurize, the compression spring 9 pushes the indexing sleeve 4 to index downward to the bottom, and the pressure is continued to be pressed to 15 MPa, and the second functional ball 21 is shot down. The functional ball 21 falls into the spiral guide ball basket 10 below, and slides down to the bottom along the outer portion of the spiral groove under the limitation of the size of the central hole of the spiral guide ball basket 10 and the guidance of the spiral groove; Position i: The compression spring 9 pushes the indexing sleeve 4 to index upward, and the tool returns to its initial state.

[0025] Embodiment 3: As attached Figure 1 , 2 As shown, four cross-distributed deceleration steps 15 are arranged at intervals on the inner side of the indexing sleeve 4. After the functional ball 21 is decelerated by the deceleration steps 15, it is stably seated on the lower elastic claw sleeve 6 to prevent the functional ball 21 from continuously passing through the upper and lower elastic claw sleeves 6.

[0026] Embodiment 4: As attached Figure 1 , 2 As shown, the deceleration step 15 is a semicircular ring, which can ensure that the functional ball 21 passes through each deceleration step 15.

[0027] Embodiment 5: As attached Figure 1 As shown, the spiral guide ball basket 10 is in the shape of a long cylinder with a through passage in the middle. A spiral guide groove 16 is provided on the outer side of the spiral guide ball basket 10 from top to bottom, and the spiral guide groove 16 is connected to the through passage.

[0028] After the functional ball 21 enters the lower outer cylinder 2, it cannot enter the spiral guide ball basket 10 due to size limitations. Under the action of the fluid, it enters the spiral groove of the spiral guide ball basket 10, goes down to the bottom along the spiral line, and falls on the second step 11; and the smaller-sized balls that drive other tools can directly drive the lower tools through the axial channel of the spiral guide ball basket 10 after passing through the upper and lower elastic claw sleeves 6 and entering the inside of the ball basket body. For example, if the small-sized ball enters the external spiral channel, it will re-enter the axial channel through the gap between the spiral channel and the internal axial channel, and finally pass through the lower outer cylinder 2 to drive the lower tool.

[0029] Embodiment 6: As attached Figure 1 , 2 As shown, a first retaining ring 17 is provided in the upper outer cylinder 1 corresponding to the upper position of the limiting sleeve 3, and a second retaining ring 18 is provided in the indexing sliding sleeve 4 corresponding to the upper position of the upper elastic claw sleeve 5. The first retaining ring 17 and the second retaining ring 18 are provided to prevent loosening.

[0030] Embodiment 7: As attached Figure 1 , 2 As shown, O-rings 19 are provided between the upper outer side and the lower outer side of the limiting sleeve 3 and the inner side of the upper outer tube 1, an O-ring 19 is provided between the lower outer side of the upper elastic claw sleeve 5 and the inner side of the transfer sleeve 4, a U-shaped sealing ring 20 is provided between the upper outer tube 1 and the transfer sleeve 4 at the position above and below the corresponding nozzle 22, an O-ring 19 is provided between the index screw 7 and the upper outer tube 1, and an O-ring 19 is provided between the upper outer side of the lower elastic claw sleeve 6 and the transfer sleeve 4.

[0031] The sealing ring is set to protect the connecting thread from drilling fluid contamination and is easy to disassemble. 20 groups of U-shaped sealing rings of different materials can be selected according to specific working conditions. Perfluoro rubber material is used in high temperature environment.

[0032] Embodiment 8: As attached Figure 1 , 2 As shown, the upper elastic claw sleeve 5 and the lower elastic claw sleeve 6 are both made of metal. The functional ball 21 is a chrome alloy steel functional ball 21, which meets the requirements of ultra-high temperature operation.

[0033] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the requirements of different situations.

Claims

1. A high temperature resistant large diameter multiple activation plugging tool, characterized in that The cam is provided with a first step inside the lower end of the upper outer cylinder, a second step inside the lower end of the upper outer cylinder and a second step inside the lower end of the upper outer cylinder.

2. The high temperature resistant large diameter multiple activation plugging tool according to claim 1 is characterized in that The indexing groove includes an upper indexing groove and a lower indexing groove. Eight identical upper indexing grooves are evenly distributed along the circumference of the indexing sleeve. A lower indexing groove is provided on the indexing sleeve corresponding to the position below the upper indexing groove. The lower indexing groove includes two groups of grooves evenly distributed along the circumference of the indexing sleeve. Each group of grooves includes three adjacent long grooves and one short groove. The tooth tip formed between every two upper indexing grooves corresponds to the position of the lower indexing groove.

3. The high temperature resistant large diameter multiple activation plugging tool according to claim 1 or 2, characterized in that Four cross-distributed deceleration steps are arranged at intervals up and down on the inner side of the indexing sleeve.

4. The high temperature resistant large diameter multiple activation plugging tool according to claim 3 is characterized in that The deceleration step is a semicircular ring.

5. The high temperature resistant large diameter multiple activation plugging tool according to claim 1, 2 or 4, characterized in that The spiral guide ball basket is in the shape of a long cylinder with a through passage in the middle. A spiral guide groove is arranged on the outer side of the spiral guide ball basket from top to bottom, and the spiral guide groove is connected with the through passage.

6. The high temperature resistant large diameter multiple activation plugging tool according to claim 3 is characterized in that The spiral guide ball basket is in the shape of a long cylinder with a through passage in the middle. A spiral guide groove is arranged on the outer side of the spiral guide ball basket from top to bottom, and the spiral guide groove is connected with the through passage.

7. The high temperature resistant large diameter multiple activation plugging tool according to claim 1 or 2 or 4 or 6, characterized in that A first retaining ring is arranged in the upper outer cylinder corresponding to the upper side position of the limiting sleeve, and a second retaining ring is arranged in the transfer sliding sleeve corresponding to the upper side position of the upper elastic claw sleeve.

8. The high temperature resistant large diameter multiple activation plugging tool according to claim 3 is characterized in that A first retaining ring is arranged in the upper outer cylinder corresponding to the upper side position of the limiting sleeve, and a second retaining ring is arranged in the transfer sliding sleeve corresponding to the upper side position of the upper elastic claw sleeve.

9. The high temperature resistant large diameter multiple activation plugging tool according to claim 5 is characterized in that A first retaining ring is arranged in the upper outer cylinder corresponding to the upper side position of the limiting sleeve, and a second retaining ring is arranged in the transfer sliding sleeve corresponding to the upper side position of the upper elastic claw sleeve.

10. The high temperature resistant large diameter multiple activation plugging tool according to claim 1 or 2 or 4 or 6 or 8 or 9, characterized in that O-rings are provided between the outer side of the upper part and the outer side of the lower part of the limiting sleeve and the inner side of the upper outer cylinder, an O-ring is provided between the outer side of the lower part of the upper elastic claw sleeve and the inner side of the indexing sleeve, a U-shaped sealing ring is provided between the upper outer cylinder and the indexing sleeve at the position above and below the nozzle, an O-ring is provided between the index screw and the upper outer cylinder, and an O-ring is provided between the outer side of the upper part of the lower elastic claw sleeve and the indexing sleeve; or / and, the upper elastic claw sleeve and the lower elastic claw sleeve are both made of metal.

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