Filling tool string

Abstract

The present invention relates to a filling tool string, which includes an outer pipe string and an inner pipe string. The inner pipe string includes a single shut-off tool and a circulation valve tool, and the single shut-off tool is arranged above the circulation valve tool. When the filling sleeve is in the open state, when the inner pipe string is lifted so that the single shut-off tool moves from below the filling sleeve to above the filling sleeve, the single shut-off tool can drive the sleeve blocking block to move to close the filling sleeve. After the filling sleeve is closed, when the inner pipe string is lowered so that the single shut-off tool moves from above the filling sleeve to below the filling sleeve, the single shut-off tool cannot drive the sleeve blocking block to move. The circulation valve tool is used to drive the sleeve blocking block to move to open the filling sleeve when the inner pipe string is lowered after the filling sleeve is closed so that the circulation valve tool moves from above the filling sleeve to below the filling sleeve. The setting of the single shut-off tool in the present invention can be used to close the opened filling sleeve, and the setting of the circulation valve tool can be used to open the closed filling sleeve, so as to realize the opening or closing operation of the filling sleeve.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil production, and particularly relates to a filling tool string. Background Art

[0002] The horizontal well gravel packing completion technology is the main means to effectively solve unconsolidated sandstone oil and gas reservoirs. At present, the demand for relevant sand control technologies in Sihai is huge, and it has very high economic value.

[0003] The horizontal well open-hole gravel packing sand control completion process is for oil wells with rich productivity in formations and loose formations prone to sand production. Gravel packing operations are carried out at the initial stage of completion. The screen pipe (blank pipe) and the open-hole wellbore wall are filled with packing gravel to form a continuous, stable and high-strength sand body to prevent formation sand from migrating into the wellbore, thus solving the sand production problem. At present, during the gravel packing process, the opening and closing of the packing sliding sleeve on the outer pipe string can be used to realize different processes of gravel packing. The traditional opening and closing of the packing sliding sleeve mainly rely on the elastic claw mechanism, but the reliability of the elastic claw mechanism is poor and the effective life is short. It cannot ensure the proper operation of the sliding sleeve opening and closing tools during the gravel packing operation, resulting in the failure of the gravel packing operation. Summary of the Invention

[0004] In order to solve all or part of the above problems, the purpose of the present invention is to provide a filling tool string. By setting a single shut-off tool, the closing of the packing sliding sleeve can be realized. At the same time, by setting a circulation valve tool, the closed packing sliding sleeve can be opened, so that the opening and closing operations of the packing sliding sleeve can be conveniently realized.

[0005] According to one aspect of the present invention, a filling tool string is provided, which includes an outer pipe string and an inner pipe string arranged inside the outer pipe string. A packing sliding sleeve is provided on the outer pipe string. The inner pipe string includes a single shut-off tool and a circulation valve tool. The single shut-off tool is arranged above the circulation valve tool;

[0006] When the packing sliding sleeve is in the open state, when the inner pipe string is lifted so that the single shut-off tool moves from below the packing sliding sleeve to above the packing sliding sleeve, the single shut-off tool can drive the sliding sleeve block to move to close the packing sliding sleeve. After the packing sliding sleeve is closed, when the inner pipe string is lowered so that the single shut-off tool moves from above the packing sliding sleeve to below the packing sliding sleeve, the single shut-off tool cannot drive the sliding sleeve block to move;

[0007] The circulation valve tool is used to drive the sliding sleeve block to move to open the packing sliding sleeve when the inner pipe string is lowered after the packing sliding sleeve is closed so that the circulation valve tool moves from above the packing sliding sleeve to below the packing sliding sleeve.

[0008] Furthermore, the single - shut - off tool includes a cylinder body. A limiting step is provided at the upper part of the cylinder body. A lower connector is connected to the lower end of the cylinder body. The lower connector is used to connect with the circulating valve tool below. A locking block is sleeved on the cylinder body between the limiting step and the lower connector. A single - shut - off groove is formed in the middle of the locking block.

[0009] After lifting the inner pipe string so that the upper protrusion is located in the single - shut - off groove, the locking block can drive the sliding sleeve block to move upward to block at the flow - through hole of the filling sliding sleeve. After the filling sliding sleeve is closed, the locking block can be disengaged from the sliding sleeve block.

[0010] After lowering the inner pipe string so that the lower protrusion is located in the single - shut - off groove, the locking block can be disengaged from the lower protrusion. When the inner pipe string is further lowered, the locking block can be disengaged from the sliding sleeve block.

[0011] Furthermore, an installation groove is formed on the inner wall of the locking block. The installation groove extends from the inner wall of the locking block to the middle of the locking block. A spring is arranged in the installation groove. An upper extension ring is provided at the upper end of the locking block. A collar is sleeved outside the upper extension ring. A lower extension ring is provided at the lower end of the locking block. The upper end of the lower connector extends to be sleeved outside the lower extension ring. The collar and the upper end of the lower connector compress the spring in the installation groove.

[0012] Furthermore, an upper compression guiding slope is provided at the locking block near the upper extension ring. The upper compression guiding slope cooperates with a lower limiting block below the flow - through hole so that the locking block can be compressed by the lower limiting block. The upper compression guiding slope cooperates with an upper limiting block above the flow - through hole so that the locking block can be compressed by the upper limiting block. The lower side of the single - shut - off groove is a plane so that after the upper protrusion is located in the single - shut - off groove, the locking block can drive the sliding sleeve block to move upward to block at the flow - through hole of the filling sliding sleeve.

[0013] Furthermore, a lower compression guiding slope is provided at the locking block near the lower extension ring. The lower compression guiding slope cooperates with an upper limiting block above the flow - through hole so that the locking block can be compressed by the upper limiting block. The upper side of the single - shut - off groove is a disengagement guiding slope, which is used to enable the lower protrusion to disengage from the single - shut - off groove. The lower compression guiding slope cooperates with a lower limiting block below the flow - through hole so that the locking block can be compressed by the lower limiting block.

[0014] Furthermore, the lower connecting head includes an upper first section of the lower connecting head and a lower second section of the lower connecting head, wherein the inner diameter of the first section of the lower connecting head is larger than the inner diameter of the second section of the lower connecting head, the first section of the lower connecting head is sleeved on the outside of the lower extension ring, the second section of the lower connecting head is sleeved on the outside of the cylinder and is connected to the cylinder by connecting screws, a connecting ring is provided below the lower extension ring, a make way space is provided between the upper end of the second section of the lower connecting head and the connecting ring, and the first section of the lower connecting head, the connecting ring and the cylinder are connected by shear pins.

[0015] Further, the circulation valve tool comprises a circulation valve body, the upper end of the circulation valve body is connected to an upper joint, the lower end of the circulation valve body is connected to a lower joint, the outer sleeve of the circulation valve body is provided with a locking ring, the middle part of the locking ring is provided with an upper step and a lower step, and a groove is provided between the upper step and the lower step;

[0016] When the inner pipe column is lowered to move the circulation valve tool from above the filling sleeve to below the filling sleeve, the lower step can be compressed by the upper limit stopper above the flow hole of the filling sleeve. After the lower protrusion is located in the groove, the locking ring can drive the sleeve stopper to move down to the flow hole away from the filling sleeve to open the filling sleeve. After the filling sleeve is opened, the locking ring can be disengaged from the sleeve stopper.

[0017] Furthermore, the locking ring is provided with a plurality of extension grooves extending along the length direction of the locking ring and penetrating the thickness direction of the locking ring, the upper step and the lower step are both located at the locking ring where the extension grooves are located, the lower side surface of the lower step is an inclined surface that cooperates with the upper inclined surface of the upper limit stop block, so that the lower step can be compressed by the upper limit stop block; the lower side surface of the upper step is a plane, so that when the lower protrusion of the sliding sleeve stop block is located in the groove, the locking ring can drive the sliding sleeve stop block to move down to the flow hole away from the filling sliding sleeve; the lower side surface of the lower step cooperates with the lower limit stop block below the flow hole so that the locking ring can be compressed by the lower limit stop block to achieve the separation of the sliding sleeve stop block from the locking ring.

[0018] Furthermore, the upper side surface of the upper step is an inclined surface that cooperates with the lower limit stop block, so that the upper step can be compressed by the lower limit stop block, and the upper side surface of the upper step cooperates with the upper limit stop block above the circulation hole so that the locking ring can be compressed by the upper limit stop block to achieve the disengagement of the sliding sleeve stopper and the locking ring; the upper side surface of the lower step is a plane, so that when the upper protrusion of the sliding sleeve stopper is located in the groove, the sliding sleeve stopper can move up with the locking ring to block the circulation hole of the filling sliding sleeve.

[0019] Further, the circulation valve body includes a central tube. The upper end of the central tube is connected to a valve seat, the upper end of the valve seat is connected to the upper joint, the lower end of the central tube is connected to the lower joint. The middle part of the valve seat is provided with a reduced-diameter part extending into the valve seat. Liquid holes penetrating the valve seat are provided on both sides of the reduced-diameter part of the valve seat. A fixing ring is provided between the valve seat and the upper joint. A valve core is provided in the middle of the fixing ring. A second spring is connected between the valve core and the fixing ring. The second spring is configured to make the valve core abut against the reduced-diameter part. A bypass ring is sleeved outside the valve seat. The upper and lower ends of the bypass ring are respectively and sealingly connected to the valve seat through sealing rings. The lower end of the bypass ring is connected to the locking ring through a connecting pin. A bypass space is provided in the middle of the bypass ring.

[0020] Further, a plurality of leakage grooves are provided on the valve core. The leakage grooves are used to communicate the space above and below the valve core.

[0021] Further, the inner pipe string further includes a seal checking tool. The seal checking tool includes an upper joint of the seal checking tool, an inner sleeve and a long connecting sleeve. The upper joint of the seal checking tool is used to connect the upper pipe string. The inner sleeve is connected to the upper joint of the seal checking tool. The lower end of the inner sleeve is connected to the long connecting sleeve. The lower end of the long connecting sleeve is used to connect the lower pipe string. A central tube is connected between the upper joint of the seal checking tool and the lower pipe string. A liquid inlet hole penetrating the thickness of the upper joint of the seal checking tool is provided on the upper joint of the seal checking tool. A liquid outlet hole penetrating the thickness of the long connecting sleeve is provided on the long connecting sleeve.

[0022] As can be seen from the above technical solutions, a filling tool string provided by the present invention has the following beneficial effects:

[0023] The setting of the single shut-off tool of the present invention can be used to close an open filling sliding sleeve, and the setting of the circulation valve tool can be used to open a closed filling sliding sleeve, so as to realize the opening or closing operation of the filling sliding sleeve. Description of the Drawings

[0024] Figure 1 It is a cross-sectional view of the single shut-off tool part of the embodiment of the present invention;

[0025] Figure 2 It is a cross-sectional view of the circulation valve tool part of the embodiment of the present invention;

[0026] Figure 3 It is a cross-sectional view of the locking ring part of the embodiment of the present invention;

[0027] Figure 4 It is a cross-sectional view of the circulation valve body part of the embodiment of the present invention;

[0028] Figure 5Schematic diagram of the seal inspection tool according to an embodiment of the present invention;

[0029] Figure 6 Schematic diagram of the filling sleeve in the open state according to an embodiment of the present invention;

[0030] Figure 7 Schematic diagram of the filling sleeve in the closed state according to an embodiment of the present invention;

[0031] Figure 8 Schematic diagram after the single - closing tool closes the filling sleeve;

[0032] Figure 9 Schematic diagram before the single - closing tool closes the filling sleeve;

[0033] Figure 10 Schematic diagram after the circulation valve tool opens the filling sleeve;

[0034] Figure 11 Schematic diagram when the circulation valve tool starts to open the filling sleeve;

[0035] In the figure, the reference numerals are:

[0036] Single - closing tool 1, cylinder body 11, limit step 12, lower connection head 13, first section of the lower connection head 131, second section of the lower connection head 132, locking block 14, single - closing groove 141, upper extension ring 142, lower extension ring 143, upper compression guiding slope 144, lower compression guiding slope 145, disengaging guiding slope 146, first spring 15, collar 16, connecting screw 17, shear pin 18, connecting ring 19;

[0037] Circulation valve tool 2, upper joint 21, lower joint 22, locking ring 23, extension groove 231, upper step 24, lower step 25, circulation valve body 26, valve core 261, valve seat 262, liquid hole 2621, central tube 263, bypass ring 264, bypass space 2641, groove 27, leakage groove 28, second spring 29,

[0038] Seal inspection tool 3, upper joint of the seal inspection tool 31, inner sleeve 32, long connecting sleeve 33, liquid inlet hole 34, liquid outlet hole 35;

[0039] Filling sleeve 4, flow - through hole 41, sleeve stop block 42, upper protrusion 421, lower protrusion 422, upper limit stop block 43, lower limit stop block 44. Detailed implementation manners

[0040] In order to better understand the purpose, structure and function of the present invention, the following further describes in detail a filling tool string of the present invention with reference to the accompanying drawings.

[0041] As Figure 1 、 Figure 2 、Figure 6 As shown, it shows a filling tool string according to an embodiment of the present invention, which includes an inner pipe string and an outer pipe string. The inner pipe string is located inside the outer pipe string. The outer pipe string includes a packer, an extension tube, a filling sleeve 4, an indicating collar, a screen pipe, a sealing cylinder, and a float shoe connected in sequence. The inner pipe string includes a setting tool, a flow guiding valve, a single shut-off tool 1, a circulation valve tool 2, a load indicator, etc. The inner pipe string is a service tool string and can be taken out of the outer pipe string after filling. Specifically, the setting tool is used to set the packer. The flow guiding valve has two states of open and closed, and is used to realize different operations during the gravel filling process.

[0042] When the filling sleeve 4 is in the open state, when the inner pipe string is lifted so that the single shut-off tool 1 moves from below the filling sleeve 4 to above the filling sleeve 4, the single shut-off tool 1 can drive the slide block 42 to move to close the filling sleeve 4. And after the filling sleeve 4 is closed, when the inner pipe string is lowered so that the single shut-off tool 1 moves from above the filling sleeve 4 to below the filling sleeve 4, the single shut-off tool 1 cannot drive the slide block 42 to move. Specifically, the filling sleeve 4 has a flow hole 41, and the opening or closing of the flow hole 41 is realized by the slide block 42. When the filling sleeve 4 is open, the slide block 42 is located below the flow hole 41. When the filling sleeve 4 is closed, the slide block 42 blocks at the flow hole 41. When the filling sleeve 4 is in the open state and the single shut-off tool 1 is below the slide block 42, when the inner pipe string is lifted, the single shut-off tool 1 moves up, and the upward movement of the single shut-off tool 1 can drive the slide block 42 to move up to block at the flow hole 41, thereby realizing the closing of the filling sleeve 4. After the filling sleeve 4 is closed, the inner pipe string is lowered, and the single shut-off tool 1 moves down. The downward movement of the single shut-off tool 1 cannot drive the slide block 42 to move down, so the filling sleeve 4 cannot be opened by the single shut-off tool 1.

[0043] The circulation valve tool 2 is used to drive the slide block 42 to move to open the filling sleeve 4 when the inner pipe string is lowered so that the circulation valve tool 2 moves from above the filling sleeve 4 to below the filling sleeve 4.

[0044] As described above, the single - isolation tool 1 is located above the circulation valve tool 2. Therefore, when the packing sleeve 4 is in the open state, when the inner pipe string is lifted and the single - isolation tool 1 moves from below the packing sleeve 4 to above the packing sleeve 4, the packing sleeve 4 is closed by the single - isolation tool 1. Continuing to lift can move the circulation valve tool 2 above the packing sleeve 4. When it is necessary to open the packing sleeve 4, lower the inner pipe string. The circulation valve tool 2 moves from above the packing sleeve 4 to below the packing sleeve 4, and the packing sleeve 4 is opened by the circulation valve tool 2. Continuing to lower the inner pipe string can lower the single - isolation tool 1 below the packing sleeve 4. When the inner pipe string is lifted again and only the single - isolation tool 1 is moved above the packing sleeve 4, the packing sleeve 4 is closed by the single - isolation tool 1 again. When the inner pipe string is lowered again, since the single - isolation tool 1 cannot open the packing sleeve 4, the packing sleeve 4 remains in the closed state, thus realizing the switching between the gravel packing process and the reverse - circulation process. The gravel packing process includes running in the pipe string, setting the packer, checking the seal, packing, reverse - circulation, checking the sleeve, pickling, etc. Among them, the packing sleeve 4 is in the open state during the processes of running in the pipe string, setting the packer, checking the seal, and packing, and the packing sleeve 4 is in the closed state during the processes of reverse - circulation, checking the sleeve, and pickling.

[0045] In a specific embodiment, as Figure 1 shown, the single - isolation tool 1 includes a cylinder body 11. A limiting step 12 is provided at the upper part of the cylinder body 11. A lower connecting head 13 is connected to the lower end of the cylinder body 11. The lower connecting head 13 is used to connect with the circulation valve tool 2 below. A locking block 14 is sleeved on the cylinder body 11 between the limiting step 12 and the lower connecting head 13. A single - isolation groove 141 is formed in the middle of the locking block 14.

[0046] After the inner pipe string is lifted and the upper protrusion 421 is located in the single - isolation groove 141, the locking block 14 can drive the sleeve stopper 42 to move upward to block the flow hole 41 of the packing sleeve 4. After the packing sleeve 4 is closed, the locking block 14 can be disengaged from the sleeve stopper 42.

[0047] After the inner pipe string is lowered and the lower protrusion 422 is located in the single - isolation groove 141, the locking block 14 can be disengaged from the lower protrusion 422. When the inner pipe string is lowered continuously again, the locking block 14 can be disengaged from the sleeve stopper 42.

[0048] In the process of lifting the inner pipe column, specifically, when the single-close tool 1 moves toward the direction close to the sleeve stopper 42 until the upper protrusion 421 is stuck in the single-close groove 141 on the locking block 14, the diameter of the locking block 14 is restored, and the locking block 14 moves upward and drives the sleeve stopper 42 to move upward through the single-close groove 141, so that the sleeve stopper 42 is blocked at the flow hole 41 of the filling sleeve 4, and the filling sleeve 4 is closed; an upper limit stopper 43 connected to the filling sleeve 4 is provided above the flow hole 41, and when the locking block contacts the upper limit stopper 43, the upper limit stopper 43 compresses the locking block to reduce the diameter of the locking block 14, and the locking block 14 is disengaged from the upper protrusion 421, and the locking block 14 can continue to move to the top of the filling sleeve 4.

[0049] When the single-close tool 1 is located above the filling sleeve 4 and the inner pipe column is lowered, specifically, when the locking block 14 moves down to the single-close groove 141 where the lower protrusion is stuck in the locking block 14, the lower protrusion can be disengaged from the single-close groove, and the locking block 14 continues to move below the lower limit stop.

[0050] In a specific embodiment, a mounting groove is provided on the inner wall of the locking block 14, and the mounting groove extends outward from the inner wall of the locking block 14 to the middle of the locking block 14. A first spring 15 is arranged in the mounting groove. An upper extension ring 142 is provided at the upper end of the locking block 14, and a sleeve ring 16 is sleeved on the outer side of the upper extension ring 142. A lower extension ring 143 is provided at the lower end of the locking block 14, and the upper end of the lower connecting head 13 extends to be sleeved on the outer side of the lower extension ring 143. The sleeve ring 16 and the upper end of the lower connecting head 13 compress the first spring 15 in the mounting groove.

[0051] In this embodiment, a first spring 15 is arranged between the locking block 14 and the cylinder 11, a sleeve ring 16 is sleeved on the outside of the upper extension ring 142, and a lower connector 13 is sleeved on the outside of the lower extension ring 143. The sleeve ring 16 and the lower connector 13 are sleeved on the locking block 14, so that the first spring 15 located in the installation groove of the locking block 14 is in a compressed state, and there is a clearance space for the locking block 14 to shrink between the inner wall of the locking block 14 and the outside of the cylinder 11. The existence of the clearance space enables the locking block 14 to be compressed, and the diameter of the locking block 14 is reduced after the locking block 14 is compressed.

[0052] In one embodiment, an upper compression guide slope 144 is provided near the upper extension ring 142 of the locking block 14, and the upper compression guide slope 144 cooperates with the lower limit block so that the locking block 14 can be compressed by the lower limit block; the upper compression guide slope 144 cooperates with the upper limit block 43 above the flow hole 41 so that the locking block 14 can be compressed by the upper limit block 43; the lower side surface of the single-close groove 141 is a plane, so that when the upper protrusion is located in the single-close groove 141, the locking block 14 can drive the sliding sleeve block 42 to move up to block the flow hole 41 of the filling sliding sleeve 4.

[0053] Specifically, during the process of lifting the inner pipe string, the locking block 14 first passes through the lower limit stop block 44, and the locking block 14 is compressed by the lower limit stop block so that the locking block 14 can move upward through the lower limit stop block 44; when the lower protrusion is above the single - closing groove, the locking block is still compressed by the lower limit stop block, so the lower protrusion will not fall into the single - closing groove, and the locking block moves upward. The locking block is simultaneously compressed by the upper protrusion and the lower protrusion. When the locking block is separated from the lower protrusion, the locking block begins to be only compressed by the upper protrusion. After the upper protrusion falls into the single - closing groove, as Figure 9 shown, the contact surface between the upper protrusion and the single - closing groove is a plane. Therefore, as the locking block moves upward, the upper protrusion moves upward with the locking block, and the locking block moves upward to make the sliding sleeve stop block 42 block at the flow hole 41 of the filling sliding sleeve 4, and the filling sliding sleeve 4 is closed. As Figure 8 shown, when the locking block moves upward and the compression guiding slope 144 first fits with the lower slope of the upper limit stop block 43, the locking block 14 is compressed by the upper limit stop block 43 to realize the separation of the locking block 14 and the sliding sleeve stop block 42.

[0054] In an embodiment, a lower compression guiding slope 145 is provided near the lower extension ring 143 of the locking block 14. The lower compression guiding slope 145 cooperates with the upper limit stop block so that the locking block 14 can be compressed by the upper limit stop block. The upper side surface of the single - closing groove 141 is a separation guiding slope 146, and the separation guiding slope 146 is used to cooperate with the upper slope of the upper protrusion 421 of the sliding sleeve stop block 42 so that the upper protrusion 421 can be separated from the single - closing groove 141; the lower compression guiding slope 145 cooperates with the lower limit stop block 44 below the flow hole 41 so that the locking block 14 can be separated from the sliding sleeve stop block 42.

[0055] Specifically, during the process of lowering the inner pipe string, the locking block 14 first passes through the upper limit stop block 43, and the locking block 14 is compressed by the upper limit stop block 43 so that the locking block 14 can move downward through the upper limit stop block 43; after the locking block 14 passes through the upper limit stop block, the upper protrusion just falls into the single - closing groove. After the upper protrusion 421 is located in the single - closing groove 141, the upper side surface of the single - closing groove 141 is a separation guiding slope 146. The separation guiding slope 146 cooperates with the upper slope of the upper protrusion 421. Therefore, when the upper slope of the upper protrusion 421 of the locking block 14 moves upward and compresses the separation guiding slope 146, the upper protrusion 421 is separated from the single - closing groove 141. Therefore, the locking block 14 cannot open the filling sliding sleeve 4 by moving downward through the upper protrusion 421; the locking block 14 continues to move downward, and the lower protrusion 422 begins to compress the locking block 14 together with the upper protrusion. After the lower protrusion falls into the single - closing groove, the separation guiding slope 146 of the single - closing groove contacts the upper side surface of the lower protrusion, and the locking block is compressed by the lower protrusion. Similarly, the lower protrusion cannot open the sliding sleeve stop block 42. When the locking block contacts the lower limit stop block, the lower limit stop block cooperates with the separation guiding slope 146, and the locking block is separated from the lower limit stop block.

[0056] In one embodiment, the lower connector 13 includes an upper lower connector first section 131 and a lower lower connector second section 132, wherein the inner diameter of the lower connector first section 131 is larger than the inner diameter of the lower connector second section 132, the lower connector first section 131 is sleeved on the outside of the lower extension ring 143, the lower connector second section 132 is sleeved on the outside of the cylinder 11 and is connected to the cylinder 11 by a connecting screw 17, a connecting ring 19 is provided below the lower extension ring 143, a make way space is provided between the upper end of the lower connector second section 132 and the connecting ring 19, and the lower connector first section 131, the connecting ring 19 and the cylinder 11 are connected by a shear pin 18.

[0057] In this embodiment, the lower connector 13 includes a first section 131 of the lower connector and a second section 132 of the lower connector. The inner diameter of the first section 131 of the lower connector is larger than the inner diameter of the second section 132 of the lower connector. The lowermost end of the second section 132 of the lower connector has a constriction, which abuts against the lower end of the cylinder 11. The second section 132 of the lower connector is sleeved on the outside of the cylinder 11 and the second section 132 of the lower connector is connected to the cylinder 11 by a connecting screw 17. When the cylinder 11 moves, the lower connector 13 can be driven to move accordingly, thereby facilitating the movement of the lower pipe column. The connecting ring 19 is arranged between the lower extension ring 143 and the second section 132 of the lower connector. 2, there is a clearance space between the connecting ring 19 and the upper end of the second section 132 of the lower connector, the first section 131 of the lower connector, the connecting ring 19 and the cylinder 11 are connected by the shear pin 18, when the locking block 14 is stuck by the upper limit stopper 43 so that the locking block 14 cannot be retracted and disengaged from the upper limit stopper 43, the shear pin 18 of the lifting inner pipe column is sheared off, and the connecting ring 19 and the locking block 14 move toward the clearance space; the upper end of the first section 131 of the lower connector is an inclined surface matched with the lower compression guide inclined surface 145, so the lock buckle is compressed by the first section 131 of the lower connector so that the lock buckle can smoothly pass through the upper limit stopper 43.

[0058] In one embodiment, if Figures 2 - 3 As shown, the circulation valve tool 2 includes a circulation valve body 26, the upper end of the circulation valve body 26 is connected to an upper joint 21, the lower end of the circulation valve body 26 is connected to a lower joint 22, the outer sleeve of the circulation valve body 26 is provided with a locking ring 23, the middle part of the locking ring 23 is provided with an upper step 24 and a lower step 25, and a groove 27 is provided between the upper step 24 and the lower step 25; in this embodiment, the upper joint 21 is used to connect with the upper pipe column, and the lower joint 22 is used to connect with the lower pipe column.

[0059] As described above, when the inner pipe string is lowered and the circulation valve tool 2 moves from above the packing sleeve 4 to below the packing sleeve 4, the circulation valve tool 2 can open the packing sleeve 4. Specifically, when the pipe string is lowered until the lower step 25 of the locking ring 23 contacts the upper protrusion 421 of the sleeve stopper 42, the lower step 25 can be compressed by the upper protrusion 421 of the sleeve stopper 42. When the upper protrusion 421 of the lower pipe string is located in the groove 27, the locking ring 23 can drive the sleeve stopper 42 to move downward to leave the flow hole 41 of the packing sleeve 4 to open the packing sleeve 4. After the packing sleeve 4 is opened, the locking ring 23 can be disengaged from the sleeve stopper 42.

[0060] In a specific embodiment, a plurality of extension grooves 231 extending along the length direction of the locking ring 23 and penetrating the thickness direction of the locking ring 23 are formed on the locking ring 23. Both the upper step 24 and the lower step 25 are located at the locking ring 23 where the extension groove 231 is located. The lower side surface of the lower step 25 is an inclined surface that cooperates with the upper inclined surface of the upper protrusion 421 so that the lower step 25 can be compressed by the upper protrusion 421; the lower side surface of the upper step 24 is a plane so that after the upper protrusion 421 of the sleeve stopper 42 is located in the groove 27, the locking ring 23 can drive the sleeve stopper 42 to move downward to leave the flow hole 41 of the packing sleeve 4; the lower side surface of the lower step 25 cooperates with the lower limit stopper 44 below the flow hole 41 so that the locking ring 23 can be compressed by the lower limit stopper 44 to realize the disengagement of the sleeve stopper 42 and the locking ring 23.

[0061] In this embodiment, the existence of the extension groove 231 on the locking ring 23 enables the locking ring 23 to be compressed. When the part of the locking ring 23 where the extension groove 231 is located is compressed, the diameter of the locking ring 23 decreases; since both the upper step 24 and the lower step 25 are located at the locking ring 23 where the extension groove 231 is located, a pipe string with a diameter smaller than the upper step 24 or the lower step 25 can pass through the locking ring 23 by compressing the upper step 24 or the lower step 25. When the inner pipe string is lowered and the circulation valve tool 2 moves from above the packing sleeve 4 to below the packing sleeve 4, the locking ring 23 is first compressed by the upper limit stopper and gradually transitions to being compressed by the upper limit stopper and the upper protrusion at the same time. When the locking ring is disengaged from the upper protrusion, the locking ring begins to be compressed by the lower protrusion. When the locking ring moves downward until the lower protrusion falls into the groove, as Figure 11 shown, since the lower side surface of the upper step 24 is a plane, the lower side surface of the upper step 24 hooks the lower protrusion and moves downward, and the locking ring 23 drives the sleeve stopper 42 to move downward to leave the flow hole 41 of the packing sleeve 4, thereby achieving the purpose of opening the packing sleeve 4, as Figure 10 shown; when the sleeve stopper 42 moves to the lower limit step, the sleeve stopper 42 cannot move downward, and the lower step is compressed by the lower limit stopper so that the lower protrusion is disengaged from the groove 27.

[0062] In one embodiment, the upper side surface of the upper step 24 is an inclined surface that cooperates with the lower limit stop block, so that the upper step 24 can be compressed by the lower limit stop block. The upper side surface of the upper step 24 cooperates with the upper limit stop block 43 above the flow hole 41 so that the locking ring 23 can be compressed by the upper limit stop block 43 to achieve the separation of the sliding sleeve stop block 42 and the locking ring 23; the upper side surface of the lower step 25 is a flat surface, so that after the upper protrusion of the sliding sleeve stop block 42 is located in the groove 27, the sliding sleeve stop block 42 can move upward with the locking ring 23 to block the flow hole 41 of the filling sleeve 4.

[0063] As can be seen from the foregoing, when the inner pipe string is lifted, the inner pipe string can be closed by the single - shut - off tool 1. In practical applications, the filling sleeve 4 is always closed by the single - shut - off tool 1. However, when there is a special situation where the single - shut - off tool 1 cannot close the filling sleeve 4, the filling sleeve 4 can be closed by the circulation valve tool 2.

[0064] Specifically, when the inner pipe string is lifted, the upper step 24 and the lower step 25 are compressed by the lower limit stop block 44; after the upper step 24 moves until the lower protrusion is located in the groove 27, the lower side surface of the groove 27, that is, the upper side surface of the lower step 25, is a flat surface. The locking ring 23 moves upward and the lower side surface of the groove 27 cooperates with the lower side surface of the lower protrusion. Therefore, the locking ring is compressed and continues to move upward. When the upper side surface of the lower step contacts the lower plane of the upper protrusion, the sliding sleeve stop block is driven upward by the locking ring to close the filling sleeve. When the sliding sleeve stop block 42 moves upward until it contacts the upper limit stop block 43, due to the blockage of the upper limit stop block 43, the sliding sleeve stop block 42 cannot continue to move upward, and the locking ring 23 begins to be compressed by the upper limit stop block 43 to achieve the separation of the locking ring 23 and the sliding sleeve stop block 42.

[0065] In one embodiment, as Figure 4 shown, the circulation valve body 26 includes a central pipe 263. The upper end of the central pipe 263 is connected with a valve seat 262. The upper end of the valve seat 262 is connected with the upper joint 21. The lower end of the central pipe 263 is connected with the lower joint 22. The middle part of the valve seat 262 is provided with a reduced - diameter part extending into the valve seat 262. Liquid holes 2621 penetrating the valve seat 262 are provided on both sides of the reduced - diameter part of the valve seat 262. A fixing ring is provided between the valve seat 262 and the upper joint 21. A valve core 261 is provided in the middle of the fixing ring. A second spring 29 is connected between the valve core 261 and the fixing ring. The second spring 29 is configured to make the valve core 261 abut against the reduced - diameter part. A bypass ring 264 is sleeved outside the valve seat 262. The upper and lower ends of the bypass ring 264 are hermetically connected with the valve seat 262 through sealing rings respectively. The lower end of the bypass ring 264 is connected with the locking ring 23 through a connecting pin. A bypass space 2641 is provided in the middle of the bypass ring 264.

[0066] In this embodiment, the circulating valve body 26 includes a central tube 263, a valve seat 262, a bypass ring 264 and a locking ring 23. The upper end of the locking ring 23 is limited by the bypass ring 264, and the lower end of the locking ring 23 is limited by the lower sub 22. The valve seat 262 is connected to the upper end of the central tube 263. A through hole penetrating the upper and lower ends of the valve seat 262 is provided in the valve seat 262. The through hole of the valve seat 262 communicates with the central hole of the central tube 263. A reduced diameter portion is provided in the valve seat 262. The valve core 261 is pressed on the reduced diameter portion by the second spring 29. Liquid holes 2621 are provided on the valve seat 262 above and below the reduced diameter portion. When the bypass ring 264 blocks one group of liquid holes 2621, the two groups of liquid holes 2621 are not communicated. When both groups of liquid holes 2621 are communicated with the bypass space 2641, the two groups of liquid holes 2621 can communicate with each other. Therefore, whether the two groups of liquid holes 2621 are communicated is determined by the relative position of the bypass ring 264 and the valve seat 262. The bypass ring 264 and the valve seat 262 are connected by a sealing ring.

[0067] The change in the relative position of the bypass ring 264 and the valve seat 262 is realized by the cooperation of the lower inclined surface of the limiting block on the outer pipe string and the upper inclined surface of the upper step 24, or the cooperation of the upper inclined surface of the limiting block on the outer pipe string and the lower inclined surface of the lower step 25. Specifically, taking the example that when the upper inclined surface of the limiting block on the outer pipe string fits with the lower inclined surface of the lower step 25, the two groups of liquid holes 2621 are communicated. When the force received by the lower step 25 is not enough to deform the lower step 25 during the lowering of the inner pipe string, the lower step 25 cannot move down following the central tube 263 and the valve seat 262. Therefore, the bypass ring 264 and the locking ring 23 are in a static state. As a result, relative movement occurs between the bypass ring 264 and the valve seat 262, causing the lower group of liquid holes 2621 to be blocked by the lower end of the bypass ring 264. At this time, the two groups of liquid holes 2621 change from being communicated to being non - communicated.

[0068] In one embodiment, a plurality of leakage grooves 28 are provided on the valve core 261. The leakage grooves 28 are used to communicate the space above and below the valve core 261. The provision of the leakage grooves 28 is used to maintain a positive pressure on the formation throughout the process and prevent the formation from being pumped and oppressed.

[0069] In one embodiment, as Figure 5 shown, the inner pipe string further includes a seal checking tool 3. The seal checking tool 3 includes an upper joint 31 of the seal checking tool, an inner sleeve 32 and a long connecting sleeve 33. The upper joint 31 of the seal checking tool is used to connect the upper pipe string. The inner sleeve 32 is connected to the upper joint 31 of the seal checking tool. The lower end of the inner sleeve 32 is connected to the long connecting sleeve 33. The lower end of the long connecting sleeve 33 is used to connect the lower pipe string. A central tube is connected between the upper joint 31 of the seal checking tool and the lower pipe string. A liquid inlet hole 34 penetrating the thickness of the upper joint 31 of the seal checking tool is provided on the upper joint 31 of the seal checking tool. A liquid outlet hole 35 penetrating the thickness of the long connecting sleeve is provided on the long connecting sleeve 33.

[0070] In this embodiment, the seal verification tool 3 is used to verify the seal of the packer. In the prior art, the seal verification of the packer relies on the rupture disc structure. However, due to its poor explosion stability and the reduction of accuracy after the tool is used multiple times, the seal verification fails, which brings great inconvenience and economic losses to on-site applications. The seal verification tool 3 of this embodiment overcomes the shortcomings of the prior art. Specifically, the upper part of the seal verification tool 3 is connected to the packer, and the lower part is connected to the flow guiding valve. When it is necessary to verify the seal of the packer, the inner pipe string is lifted according to the matching length of the pipe string so that the liquid outlet hole 35 of the seal verification tool extends into the rubber cylinder of the packer. At this time, the flow channel of the entire pipe string is closed, and the annulus is pressured at the liquid inlet hole of the seal verification tool, and the seal verification function of the top packer can be realized.

[0071] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present invention belongs.

[0072] In addition, the terms "one", "two", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. In the description of the present invention, "a plurality" means more than two unless otherwise specifically defined.

[0073] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A filling tool string, comprising an outer pipe string and an inner pipe string disposed within the outer pipe string, wherein a filling sleeve is provided on the outer pipe string. Characterized in that the inner pipe string includes a single shut-off tool and a circulation valve tool, and the single shut-off tool is disposed above the circulation valve tool; when the filling sleeve is in an open state, when the inner pipe string is lifted so that the single shut-off tool moves from below the filling sleeve to above the filling sleeve, the single shut-off tool can drive the slide block to move so that the filling sleeve closes, and after the filling sleeve closes, when the inner pipe string is lowered so that the single shut-off tool moves from above the filling sleeve to below the filling sleeve, the single shut-off tool cannot drive the slide block to move; the circulation valve tool is used to drive the slide block to move so that the filling sleeve opens when the inner pipe string is lowered after the filling sleeve closes and the circulation valve tool moves from above the filling sleeve to below the filling sleeve, and the inner wall of the slide block has an upper protrusion and a lower protrusion; the circulation valve tool includes a circulation valve body, an upper joint is connected to the upper end of the circulation valve body, a lower joint is connected to the lower end of the circulation valve body, a lock ring is sleeved outside the circulation valve body, an upper step and a lower step are provided in the middle of the lock ring, and a groove is provided between the upper step and the lower step; when the inner pipe string is lowered so that the circulation valve tool moves from above the filling sleeve to below the filling sleeve, the lower step can be compressed by an upper limit stop block above the flow hole of the filling sleeve, and after the lower protrusion falls into the groove, the lock ring can drive the lower protrusion of the slide block to move downward to leave the flow hole of the filling sleeve to open the filling sleeve, and after the filling sleeve opens, the lock ring can be disengaged from the slide block; the circulation valve body includes a central pipe, a valve seat is connected to the upper end of the central pipe, the upper end of the valve seat is connected to the upper joint, the lower end of the central pipe is connected to the lower joint, a reduced diameter portion extending into the valve seat is provided in the middle of the valve seat, liquid holes penetrating the valve seat are provided on both sides of the reduced diameter portion of the valve seat, a fixing ring is provided between the valve seat and the upper joint, a valve core is provided in the middle of the fixing ring, a second spring is connected between the valve core and the fixing ring, and the second spring is configured to press the valve core against the reduced diameter portion. A bypass ring is sleeved outside the valve seat, the upper and lower ends of the bypass ring are respectively sealed and connected to the valve seat through sealing rings, the lower end of the bypass ring is connected to the lock ring through a connecting pin, and a bypass space is provided in the middle of the bypass ring.

2. The filling tool string according to claim 1, Characterized in that the single shut-off tool includes a cylinder body, a limit step is provided at the upper part of the cylinder body, a lower connection head is connected to the lower end of the cylinder body, the lower connection head is used to connect to the circulation valve tool below, a lock block is sleeved on the cylinder body between the limit step and the lower connection head, and a single shut-off groove is provided in the middle of the lock block. After the inner pipe column is lifted up so that the upper protrusion is located in the single-close groove, the locking block can drive the sliding sleeve stopper to move up to block the flow hole of the filling sliding sleeve, and after the filling sliding sleeve is closed, the locking block can be disengaged from the sliding sleeve stopper; After the inner tube column is lowered so that the lower protrusion is located in the single-close groove, the locking block can be disengaged from the lower protrusion. When the inner tube column is lowered again, the locking block can be disengaged from the sliding sleeve stopper.

3. The filling tool string according to claim 2, It is characterized in that An installation groove is provided on the inner wall of the lock block, and the installation groove extends outward from the inner wall of the lock block to the middle part of the lock block. A first spring is arranged in the installation groove, an upper extension ring is provided at the upper end of the lock block, a sleeve is provided on the outer side of the upper extension ring, a lower extension ring is provided at the lower end of the lock block, and the upper end of the lower connecting head extends to be sleeved on the outer side of the lower extension ring, and the sleeve and the upper end of the lower connecting head compress the first spring into the installation groove.

4. The filling tool string according to claim 3, It is characterized in that The locking block is provided with an upper compression guide slope near the upper extension ring, and the upper compression guide slope cooperates with the lower limit block below the circulation hole so that the locking block can be compressed by the lower limit block; the upper compression guide slope cooperates with the upper limit block above the circulation hole so that the locking block can be compressed by the upper limit block; the lower side surface of the single-gate groove is a plane, so that when the upper protrusion is located in the single-gate groove, the locking block can drive the sliding sleeve block to move up to block the circulation hole of the filling sliding sleeve.

5. The filling tool string according to claim 3, It is characterized in that The locking block is provided with a lower compression guide bevel near the lower extension ring, and the lower compression guide bevel cooperates with the upper limit stopper above the circulation hole so that the locking block can be compressed by the upper limit stopper; the upper side surface of the single-close groove is a disengagement guide bevel, and the disengagement guide bevel is used to enable the lower protrusion to disengage from the single-close groove; the lower compression guide bevel cooperates with the lower limit stopper below the circulation hole so that the locking block can be compressed by the lower limit stopper.

6. The filling tool string according to claim 5, It is characterized in that The lower connecting head comprises an upper first section of the lower connecting head and a lower second section of the lower connecting head, wherein the inner diameter of the first section of the lower connecting head is larger than the inner diameter of the second section of the lower connecting head, the first section of the lower connecting head is sleeved on the outside of the lower extension ring, the second section of the lower connecting head is sleeved on the outside of the cylinder and is connected to the cylinder by connecting screws, a connecting ring is provided below the lower extension ring, a clearance space is provided between the upper end of the second section of the lower connecting head and the connecting ring, and the first section of the lower connecting head, the connecting ring and the cylinder are connected by shear pins.

7. The filling tool string according to claim 1, It is characterized in that A plurality of extension grooves are formed in the locking ring, extending along the length direction of the locking ring and penetrating the thickness direction of the locking ring. Both the upper step and the lower step are located at the position of the locking ring where the extension grooves are located. The lower side surface of the lower step is an inclined surface that cooperates with the upper inclined surface of the upper limit stop block, so that the lower step can be compressed by the upper limit stop block; the lower side surface of the upper step is a plane, so that after the lower protrusion of the sliding sleeve block is located in the groove, the locking ring can drive the sliding sleeve block to move downward to leave the flow hole of the filling sleeve; the lower side surface of the lower step cooperates with the lower limit stop block below the flow hole so that the locking ring can be compressed by the lower limit stop block to realize the separation of the sliding sleeve block from the locking ring.

8. The filling tool string according to claim 7, wherein, the upper side surface of the upper step is an inclined surface that cooperates with the lower limit stop block, so that the upper step can be compressed by the lower limit stop block. The upper side surface of the upper step cooperates with the upper limit stop block above the flow hole so that the locking ring can be compressed by the upper limit stop block to realize the separation of the sliding sleeve block from the locking ring; the upper side surface of the lower step is a plane, so that after the upper protrusion of the sliding sleeve block is located in the groove, the sliding sleeve block can move upward with the locking ring to block the flow hole of the filling sleeve.

9. The filling tool string according to claim 1, wherein, a plurality of leakage grooves are provided on the valve core, and the leakage grooves are used to communicate the space above and below the valve core.

10. The filling tool string according to claim 1, wherein, the inner pipe string further includes a seal checking tool, which includes a seal checking tool upper joint, an inner sleeve and a long connecting sleeve. The seal checking tool upper joint is used to connect the upper pipe string. The inner sleeve is connected to the seal checking tool upper joint. The lower end of the inner sleeve is connected to the long connecting sleeve. The lower end of the long connecting sleeve is used to connect the lower pipe string. A central pipe is connected between the seal checking tool upper joint and the lower pipe string. A liquid inlet hole penetrating the thickness of the seal checking tool upper joint is provided on the seal checking tool upper joint, and a liquid outlet hole penetrating the thickness of the long connecting sleeve is provided on the long connecting sleeve.

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