A full-gauge precision fracturing sliding sleeve device

Abstract

The utility model discloses a full gauge precision fracturing sliding sleeve device, and the device includes fracturing connecting nipple and fracturing opening tool two parts, wherein the fracturing connecting nipple includes fracturing nipple, sliding sleeve and shear pin, is equipped with the longitudinal fracturing hole of equidistribution periphery on fracturing nipple, is used for passing through fracturing fluid, and there is the first threaded hole matched with shear pin on fracturing nipple, and the upper end of shear pin screw thread is located in the first threaded hole, and the inner chamber surface of fracturing nipple is provided with second circumferential groove and third circumferential groove, and the end of sliding sleeve has the dog claw type boss matched with the two circumferential grooves on fracturing nipple, and the inner chamber surface of sliding sleeve is provided with the fourth circumferential groove matched with the dog pin, and the outer surface of sliding sleeve is opened with the first circumferential groove matched with shear pin, and the lower end of shear pin screw thread is installed in the first circumferential groove, and sliding sleeve is fixed in the inside of fracturing nipple through shear pin. The utility model can open the same sliding sleeve of each level fracturing connecting nipple through a group of fracturing opening tools.

Description

Technical Field

[0001] This utility model belongs to the field of fracturing and completion technology, specifically relating to a full-bore precision fracturing sliding sleeve device. Background Technology

[0002] After an oil well reaches a certain stage of production, its capacity and permeability decrease. In order to enhance oil discharge capacity and increase oil well production, new fracturing technologies are used. Currently, the preferred hydraulic fracturing technology relies on a surface high-pressure pump truck to inject fluid into the well at high speed. The high pressure generated causes the oil layer rock to fracture, thereby increasing the oil well's production.

[0003] In the prior art, application number 202011153937.4, utility model title fracturing device, includes a multi-stage fracturing mechanism with full-bore sequential connection. This mechanism is connected end to end by casing. Each stage of the fracturing mechanism includes a body, a sliding sleeve, and a switching short section. The sliding sleeve is located inside the body. During fracturing, a switching short section with a soluble ball on top is dropped into the bottom of the well. The sliding sleeve of the fracturing mechanism is provided with circumferential grooves of different lengths, and the switching short section is provided with concave platforms of different lengths. The length of the protrusion of the switching short section of the same stage of the fracturing mechanism corresponds one-to-one with the length of the circumferential groove of the sliding sleeve. Thus, the protrusion of the switching short section of the same stage can enter the circumferential groove of the sliding sleeve. In this way, the switching short sections of the multi-stage fracturing mechanism can open multiple sliding sleeves with the same inner diameter, thereby forming a large-bore production channel in the wellbore through multiple sliding sleeves with the same inner diameter.

[0004] Because in related technologies, each switch section can only correspond to a unique sliding sleeve, this leads to problems such as reduced equipment versatility and increased equipment production costs. Utility Model Content

[0005] The purpose of this invention is to provide a full-bore precision fracturing sliding sleeve device, which uses a set of fracturing opening tools to open the same sliding sleeve of each stage of the fracturing connecting short section.

[0006] To achieve the above objectives, this utility model provides a full-bore precision fracturing sliding sleeve device, comprising two parts: a fracturing connecting section and a fracturing opening tool. The fracturing connecting section includes a fracturing section, a sliding sleeve, and a shear pin. The fracturing section has circumferentially distributed longitudinal fracturing holes for the passage of fracturing fluid. The fracturing section has a first threaded hole that matches the shear pin, with the upper end of the shear pin thread located within the first threaded hole. The inner surface of the fracturing section has a second and a third circumferential groove. The lower part of the third circumferential groove has an annular protrusion. The end of the sliding sleeve has a claw-type boss that mates with the two circumferential grooves on the fracturing section. The inner surface of the sliding sleeve has a fourth circumferential groove that matches the shear pin. The outer surface of the sliding sleeve has a first circumferential groove that matches the shear pin. The upper and lower sides of the outer surface of the sliding sleeve both have annular grooves for installing annular sealing rings. The lower end of the shear pin thread is installed in the first circumferential groove. The sliding sleeve is fixed inside the fracturing section by the shear pin.

[0007] The fracturing tool includes a key assembly, which comprises a key, a locking pin, a lead screw, a disc spring, and a check valve. The key has a keyway for fluid flow. At the lower end of the keyway is a second threaded hole into which the check valve is installed. The key has a key cavity in the middle. The locking pin is threaded to the upper end of the lead screw. The disc spring is installed between the lower step of the lead screw and the key step. The outer wall of the key also has a key ring groove for installing a sealing ring.

[0008] Furthermore, the fracturing connection sub also includes an upper connector and a lower connector. The male thread at the lower end of the upper connector is threaded to the female thread at the upper end of the fracturing sub, and the male thread at the upper end of the lower connector is threaded to the female thread at the lower end of the fracturing sub.

[0009] Furthermore, the upper end of the upper connector is connected to the upper sleeve, and the lower end of the lower connector is connected to the lower sleeve.

[0010] Furthermore, the upper end of the lower connector is provided with a step for mating together when connected with the fracturing sub.

[0011] Furthermore, both the top and bottom ends of the key are designed with arc surfaces to facilitate the upward and downward movement of the key.

[0012] Furthermore, the fracturing opening tool also includes a high-pressure coiled tubing, which is connected to the key via a threaded connection.

[0013] In addition, another objective of this utility model is to provide a method for using a full-bore precision fracturing sleeve, including:

[0014] Step 1. Pressurize the tubing by pumping pressure through the outer annulus of the high-pressure coiled tubing. The high-pressure coiled tubing, along with the key, descends from the wellhead. When the key descends through the casing section, because the casing diameter is larger than the key's outer diameter, the fluid below the key will pass through the outer perimeter of the key and the check valve. When the key passes through the fracturing sub, the fluid below the key can only enter the key passage through the check valve to balance the pressure.

[0015] Step 2. Once the key has descended to the position where it engages with the sliding sleeve, stop pumping. Use another set of pressure pumps from the wellhead to pressurize the key passage. The pumped fluid cannot pass through the check valve, which will squeeze the lead screw and compress the disc spring, causing the locking pin to extend into the fourth groove on the inner surface of the sliding sleeve. After the locking pin is fully extended, continue to pressurize the outer annulus of the high-pressure coiled tubing. Once a certain pressure is reached, the shear pin will be cut off. Under this force, the claw-type boss will begin to contract, causing the key and the sliding sleeve to descend together until the claw-type boss reaches an annular protrusion. At this point, the fracturing hole is fully opened, and then the fracturing and well completion work begins.

[0016] Step 3. After this stage of fracturing is completed, the pressure in the keyway is released at the wellhead. After the pressure is released, the chuck retracts back to its initial state under the elastic force of the disc spring. After the chuck retracts, the key is then moved down or up by pumping through the annulus of the high-pressure coiled tubing or by lifting the high-pressure coiled tubing, so as to reach the designated first-stage fracturing sliding sleeve device. After reaching it, the above actions are repeated to start the next fracturing and well completion work.

[0017] Furthermore, the end of the claw-type boss has a boss, and the boss has a front chamfer. When the sliding sleeve moves downward, the front chamfer guides the claw of the claw-type boss to retract accordingly.

[0018] Furthermore, the end of the claw-type boss has a rear chamfer, which matches the groove wall of the third circumferential groove to prevent the slide from moving upward.

[0019] This utility model solves the problem and has the following advantages:

[0020] In use, once the key reaches the designated position, it engages with the sliding sleeve via a locking pin on the key. This allows a set of fracturing tools to open the same sliding sleeve of each fracturing connecting section. After fracturing is completed, a full-bore production channel is formed in the wellbore, greatly improving the production efficiency of oil and gas wells. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the overall structure of the present invention in its initial installation state.

[0022] Figure 2 This is an overall cross-sectional view of the fracturing sub-section of this utility model.

[0023] Figure 3 This is a cross-sectional view of the shear pin of this utility model.

[0024] Figure 4 This is an overall cross-sectional view of the sliding sleeve of this utility model.

[0025] Figure 5 This is a cross-sectional view of the key of this utility model.

[0026] Figure 6 This is an overall cross-sectional view of the lead screw of this utility model.

[0027] Figure 7 This is a cross-sectional view of the overall structure of the present invention in its working state.

[0028] In the diagram, 1-upper connector, 111-lower male thread of upper connector, 2-fracturing sub, 21-upper female thread of fracturing sub, 22-lower female thread of fracturing sub, 23-fracturing hole, 24-first threaded hole, 25-second circumferential groove, 26-third circumferential groove, 27-annular protrusion, 3-sliding sleeve, 31-first circumferential groove, 32-claw-type boss, 33-fourth circumferential groove, 34-annular groove, 4-shearing pin, 41-upper end of shearing pin thread, 4 2-Lower end of shear pin, 5-Lower connector, 51-Upper male thread of lower connector, 52-Upper step of lower connector, 6-High pressure continuous tubing, 61-Lower male thread of continuous tubing, 7-Key, 71-Female thread of key, 72-Key channel, 73-Second threaded hole, 74-Key cavity, 75-Key step, 76-Key ring groove, 8-Snap pin, 9-Lead screw, 91-Upper end of lead screw thread, 92-Lower step of lead screw, 10-Disc spring, 11-Check valve. Detailed Implementation

[0029] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] like Figure 1 As shown, this utility model provides a full-bore precision fracturing sliding sleeve device, comprising two parts: a fracturing connecting section and a fracturing opening tool. The fracturing connecting section includes an upper connector 1, a fracturing sub 2, a sliding sleeve 3, a shear pin 4, and a lower connector 5. The fracturing opening tool includes a high-pressure coiled tubing 6 and a key assembly. The key assembly includes a key 7, a locking pin 8, a lead screw 9, a disc spring 10, and a check valve 11. Both the upper and lower ends of the key 7 are designed with arc surfaces to facilitate the upward and downward movement of the key 7. The locking pin 8, the lead screw 9, the disc spring 10, and the check valve 11 are all installed in the cavity inside the key 7.

[0031] like Figure 1As shown, the upper end of the upper connector 1 is connected to the upper casing, and the lower end of the lower connector 5 is connected to the lower casing. In use, the full-bore precision fracturing sliding sleeve device of this invention is lowered into the well along with the casing to begin well completion and other operations.

[0032] like Figure 1 , Figure 2 As shown, the male thread 111 at the lower end of the upper connector 1 is threaded to the female thread 21 at the upper end of the fracturing sub 2, and the male thread 51 at the upper end of the lower connector 5 is threaded to the female thread 22 at the lower end of the fracturing sub 2. The upper end of the lower connector 5 is provided with a step 52 for mating with the fracturing sub 2.

[0033] like Figure 1 , Figure 2 , Figure 3 As shown, the fracturing sub 2 has circumferentially distributed longitudinal fracturing holes 23 for fracturing fluid to pass through. The fracturing sub 2 has a first threaded hole 24 that matches the shear pin 4, and the upper end 41 of the shear pin thread is located in the first threaded hole 24.

[0034] like Figure 1 , Figure 2 , Figure 4 As shown, the inner surface of the fracturing sub 2 has a second circumferential groove 25 and a third circumferential groove 26. The lower part of the third circumferential groove 26 has an annular protrusion 27. After the sliding sleeve is opened, the claw-type boss 32 abuts against the annular protrusion 27, which is used to support the weight of the sliding sleeve 3. The end of the sliding sleeve 3 has a claw-type boss 32 that mates with the two circumferential grooves on the fracturing sub 2. The inner surface of the sliding sleeve 3 has a fourth circumferential groove 33 that matches the locking pin 8.

[0035] like Figure 1 , Figure 4 As shown, the outer surface of the sliding sleeve 3 has a first circumferential groove 31 that matches the shear pin 4. The lower end 42 of the shear pin thread is installed in the first circumferential groove 31, and the sliding sleeve 3 is fixed inside the fracturing section 2 by the shear pin 4. In addition, the outer surface of the sliding sleeve on both the upper and lower sides of the first circumferential groove 31 has annular grooves 34 for installing an annular sealing ring. The annular sealing ring ensures that the sliding sleeve 3 can reliably move downwards during pressurization.

[0036] like Figure 1 , Figure 5 , Figure 6As shown, the male thread 61 at the lower end of the high-pressure coiled tubing 6 is threaded to the female thread 71 at the upper end of the key 7. The key 7 has a key channel 72 for fluid passage. The lower end of the key channel 72 has a second threaded hole 73, within which a check valve 11 is installed. The key 7 has a key cavity 74 in the middle, inside which a locking pin 8, a lead screw 9, and a disc spring 10 are installed. The locking pin 8 is threaded to the upper end 91 of the lead screw, and the disc spring 10 is installed between the lower step 92 of the lead screw and the key step 75. Furthermore, the outer wall of the key also has a key ring groove 76 for installing a sealing ring. The sealing ring ensures that the key 7 descends together with the high-pressure coiled tubing 6 during annular pumping.

[0037] like Figure 7 As shown, a method of using a full-bore precision fracturing sliding sleeve device includes:

[0038] During operation, the high-pressure coiled tubing 6 is pressurized and pumped through the outer annulus. The high-pressure coiled tubing 6, together with the key 7, descends from the wellhead. When the key descends through the casing section, because the casing diameter is larger than the key's outer diameter, the fluid below the key 7 will pass through the outer periphery of the key and the check valve 11. When the key 7 passes through the fracturing sub 2, the fluid below the key 7 can only enter the key passage 72 through the check valve 11 to balance the pressure.

[0039] Once the key 7 descends to the position where it engages with the sliding sleeve 3, pumping is stopped. Another set of pressure pumps is used from the wellhead to pressurize the key passage 72. The pumped fluid cannot pass through the check valve 11, thus squeezing the lead screw 9 and compressing the disc spring 10. This causes the locking pin 8 to extend into the fourth groove 33 on the inner surface of the sliding sleeve 3. After the locking pin 8 is fully extended, pressure continues to be applied to the outer annulus of the high-pressure coiled tubing 6. Upon reaching a certain pressure, the shear pin 4 is cut off. Under this force, the claw-type boss 32 begins to retract (the claw-type boss has a boss at the end with a front chamfer. As the sliding sleeve descends, the front chamfer guides the retraction of the claw-type boss's claws). This causes the key 7 and the sliding sleeve 3 to descend together until the claw-type boss 32 reaches the annular protrusion 27. The annular protrusion 27 bears the weight of the sliding sleeve, preventing the lower connector 2 from being subjected to pressure while simultaneously serving a connecting function. At this point, the fracturing hole 23 is fully open, and fracturing and well completion work begins.

[0040] After this stage of fracturing is completed, the pressure in the keyway 72 is released at the wellhead. After depressurization, the locking pin 8 retracts back to its initial state under the elastic force of the disc spring 10. After the locking pin 8 retracts, the key 7 is moved down or up by pumping through the outer annulus of the high-pressure coiled tubing 6 or by lifting the high-pressure coiled tubing 6. (At this time, to prevent the sliding sleeve 3 from moving upwards due to friction when the key 7 moves upwards, causing the fracturing hole 23 to close, the boss at the end of the claw-type boss 32 has a back chamfer. The back chamfer matches the groove wall of the third circumferential groove 26, blocking the sliding sleeve 3 from moving upwards. When it is necessary to close the fracturing hole 23, a special tool needs to be lowered from the wellhead to move the sliding sleeve 3 upwards to close the fracturing hole 23.) This allows the designated first-stage fracturing sliding sleeve device to be reached. After reaching the device, the above actions are repeated to start the next fracturing completion operation.

[0041] When running casing from the wellhead, each stage of fracturing connector is connected to the casing both above and below. Since both the casing length and the length of the fracturing connector are fixed, the number of fracturing connectors installed between the casing sections is recorded, as is the depth of each stage of fracturing connector downhole. This ensures that the key descends accurately to the position where it engages with the sliding sleeve.

[0042] As the high-pressure coiled tubing 6 and key 7 are pumped, the pumping pressure increases each time it passes through the first-stage fracturing connection stub, and the wellhead hydraulic control equipment can clearly record this.

[0043] This invention uses a set of fracturing opening tools to open the same sliding sleeve of each stage of fracturing connecting short section, forming a full-bore production channel in the wellbore after fracturing is completed, which greatly improves the production efficiency of oil and gas wells.

[0044] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above content. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A full-bore precision fracturing sliding sleeve device, characterized in that, The device comprises two parts: a fracturing connection section and a fracturing opening tool. The fracturing connection section includes a fracturing section, a sliding sleeve, and a shear pin. The fracturing section has circumferentially distributed longitudinal fracturing holes for fracturing fluid to pass through. The fracturing section has a first threaded hole that matches the shear pin. The upper end of the shear pin thread is located in the first threaded hole. The inner surface of the fracturing section has a second circumferential groove and a third circumferential groove. The lower part of the third circumferential groove has an annular protrusion. The end of the sliding sleeve has a claw-type boss that mates with the two circumferential grooves on the fracturing section. The inner surface of the sliding sleeve has a fourth circumferential groove that matches the shear pin. The outer surface of the sliding sleeve has a first circumferential groove that matches the shear pin. The upper and lower sides of the outer surface of the sliding sleeve both have annular grooves for installing annular sealing rings. The lower end of the shear pin thread is installed in the first circumferential groove. The sliding sleeve is fixed inside the fracturing section by the shear pin. The fracturing tool includes a key assembly, which comprises a key, a locking pin, a lead screw, a disc spring, and a check valve. The key has a key channel for fluid passage, and a second threaded hole at the lower end of the key channel. The check valve is installed in the second threaded hole. The key has a key cavity in the middle. The locking pin is threaded to the upper end of the lead screw. The disc spring is installed between the lower step of the lead screw and the key step. The outer wall of the key also has a key ring groove for installing a sealing ring.

2. The apparatus according to claim 1, characterized in that, The fracturing connection sub also includes an upper connector and a lower connector. The male thread at the lower end of the upper connector is threaded to the female thread at the upper end of the fracturing sub, and the male thread at the upper end of the lower connector is threaded to the female thread at the lower end of the fracturing sub.

3. The apparatus according to claim 2, characterized in that, The upper end of the upper connector is connected to the upper sleeve, and the lower end of the lower connector is connected to the lower sleeve.

4. The apparatus according to claim 2, characterized in that, The upper end of the lower connector is provided with a step.

5. The apparatus according to claim 1, characterized in that, Both the top and bottom ends of the key are rounded to facilitate its upward and downward movement.

6. The apparatus according to claim 1, characterized in that, The fracturing starter also includes a high-pressure coiled tubing, which is connected to the key via a threaded connection.

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