Integrated pipe column for fracturing and filling and method for putting into production

Abstract

The present application relates to oil and gas well development technical field, especially relates to a kind of immobile pipe column separate layer fracturing packing production integration pipe column and method.The technical scheme is: the lower end of upper packing tool is connected with upper sand control screen pipe, the lower end of lower packing tool is connected with lower sand control screen pipe, interlayer packer is installed between upper sand control screen pipe and lower packing tool, upper packing tool is equipped with upper filling port, and lower packing tool is equipped with lower filling port.Its beneficial effect is: the first soluble ball is input to press, and liquid cylinder is moved down, and the lower skin bowl is released, and is tightly attached to the inner wall of casing to realize isolation, and the lower filling port is opened by continuing to press, and the fracturing packing construction to lower oil and gas reservoir is realized, the second soluble ball is input to close the lower filling port, and the third soluble ball is input to open the upper filling port, and the fracturing packing construction to upper oil and gas reservoir is realized, and gas lift production is realized after backwashing well;It is simple to operate, improves the development effect of gas well, and reduces cost.

Description

Technical Field

[0001] This invention relates to the field of oil and gas well development technology, and in particular to an integrated tubing string and method for layered fracturing, filling and production without moving the tubing string. Background Technology

[0002] As the utilization of loose sandstone gas reservoirs continues to deepen, the indiscriminate development of multi-layered gas reservoirs cannot achieve the expected results. The main reason is the severe heterogeneity between layers. The reservoir characteristics such as high water cut, high clay content, and high sensitivity greatly restrict the efficient development of multi-layered gas reservoirs. Conventional indiscriminate sand control technology can no longer meet the development needs of complex gas reservoirs. The currently used oil well stratified fracturing and filling sand control tubing string can realize the stratified fracturing and filling process. It generally consists of an outer tubing string and an inner tubing string. The outer tubing string consists of a top-suspended packer and upper filling tool, an interlayer packer and lower filling tool. The inner tubing string consists of an inner filling tool, release valve, backwash valve, flushing pipe, etc. The structure is cumbersome. During construction, the operation team needs to cooperate to raise and lower the inner tubing to realize stratified fracturing and filling. The operation procedure is complicated, the safety risk is high, and the operation cost is high.

[0003] In order to effectively take advantage of the fact that gas wells do not require pumping after fracturing operations, a method and technique for integrated fracturing, filling and production with a fixed tubing string is designed. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned deficiencies in existing technologies by providing an integrated tubing string and method for layered fracturing, filling, and production without a fixed tubing string. This method separates the upper and lower oil and gas reservoirs using an upper sealing cup and an interlayer packer. A first soluble ball is inserted to open the lower filling port, enabling filling of the lower oil and gas reservoir. A second soluble ball is inserted to close the lower filling port, and a third soluble ball is inserted to open the upper filling port, enabling filling of the upper oil and gas reservoir. This method is simple to operate, improves the development effect of gas wells, and reduces production operating costs.

[0005] The present invention mentions an integrated fracturing and filling production line for stationary tubing, the technical solution of which includes an upper filling tool, an upper sand control screen, an interlayer packer, a lower filling tool, and a lower sand control screen. The lower end of the upper filling tool is connected to the upper sand control screen, the lower end of the lower filling tool is connected to the lower sand control screen, and an interlayer packer is installed between the upper sand control screen and the lower filling tool. The upper filling tool includes an upper connector, an upper sliding sleeve, an upper filling sleeve, a cup seat, an upper cup, a central tube, a connecting sleeve, an opening sleeve, a slit sleeve, and an inner tube. The upper end of the central tube is connected to the upper connector via the upper sliding sleeve, the upper filling sleeve, and the cup seat. The cup seat is installed on the upper outer wall of the central tube. The upper filling sleeve is installed on the upper part of the cup seat, and the upper filling sleeve has an upper filling port. The upper cup is installed on the lower part of the cup seat. The connecting sleeve, the opening sleeve, and the slit sleeve are installed on the lower end of the central tube, and the lower end of the connecting sleeve is connected to the inner tube. The lower filling tool includes a connecting joint, a sliding sleeve, a lower ball seat, and a lower filling sleeve. The sliding sleeve is installed on the lower inner wall of the connecting joint, and the lower filling sleeve is installed on the lower outer side of the connecting joint. A lower filling port is provided on the lower filling sleeve. The lower ball seat is fixedly connected to the inner wall of the lower filling sleeve by a fourth shear pin, and the lower ball seat is located above the lower filling port.

[0006] Preferably, the interlayer packer includes a sealing sleeve, a cup cap, a lower cup, an interlayer sealing center tube, and a liquid cylinder. The cup cap is installed on the upper side of the interlayer sealing center tube, the lower cup is installed on the lower side of the cup cap, the liquid cylinder is installed on the lower side of the interlayer sealing center tube, and the upper side of the cup cap is connected to the sealing sleeve.

[0007] Preferably, the lower end of the inner tube is connected to the upper end of the sealing tube via a threaded connection. The lower end of the sealing tube is inserted into the inner wall of the sealing sleeve. The upper end of the sealing sleeve is connected to the lower end of the upper sand screen tube. The lower end of the sealing sleeve is connected to the upper end of the leather cup cap.

[0008] Preferably, the upper sliding sleeve includes an upper sliding sleeve connector, an upper sliding sleeve body, an upper sliding sleeve ball seat, an upper sliding sleeve limiting protrusion, and an upper sliding sleeve sealing groove. The upper sliding sleeve body is provided with an upper sliding sleeve connector at its upper end, and an upper sliding sleeve ball seat is provided on the inner wall of the upper sliding sleeve connector for receiving the third soluble ball. An upper sliding sleeve limiting protrusion is provided on the outer wall of the upper sliding sleeve connector for contacting the upper end of the central tube to limit the upper sliding sleeve. An upper sliding sleeve sealing groove is provided on the outer side of the upper end of the upper sliding sleeve connector.

[0009] Preferably, a soluble ring is installed inside the upper cup to form a funnel-shaped structure, with the wide opening at the bottom and the narrow opening at the top; the upper filling sleeve is provided with an upper filling port, and before the upper sliding sleeve moves down, it is sealed by the sealing ring installed on the outer wall of the upper sliding sleeve joint and the upper sliding sleeve limiting protrusion; after the upper sliding sleeve moves down, the upper filling sleeve exposes the upper filling port.

[0010] Preferably, a connecting sleeve is installed at the lower end of the central tube. The inner side of the lower end of the connecting sleeve is connected and fixed to the opening sleeve by the opening sleeve shear pin. The opening sleeve is provided with a liquid passage hole. The outer side of the lower end of the connecting sleeve is connected to the slit sleeve. The lower end of the connecting sleeve is connected to the upper end of the inner tube. An outer liquid passage hole is provided in the middle of the connecting sleeve. After the opening sleeve shear pin is cut, the opening sleeve moves down, so that the liquid passage hole communicates with the outer liquid passage hole, so that the liquid flows out along the liquid passage hole, the outer liquid passage hole and the slit on the slit sleeve.

[0011] Preferably, the upper inner wall of the above-mentioned connecting joint is connected to the lower end of the interlayer sealing center tube by a threaded connection. The upper part of the inner wall of the connecting joint is provided with a connecting joint ball seat, and a third shear pin is provided below the connecting joint ball seat. The lower sleeve is fixed by the third shear pin. A lower filling sleeve is installed on the lower side of the outer wall of the connecting joint, and a retaining spring is installed at the lower end of the connecting joint.

[0012] Preferably, the inner wall of the sliding sleeve is provided with a sliding sleeve ball seat for receiving the second soluble ball, and the lower side of the lower filling sleeve is provided with a lower filling port.

[0013] Preferably, the upper end of the liquid cylinder is provided with a lower protective ring, which locks and protects the lower cup. The upper side of the liquid cylinder is fixed to the outer wall of the interlayer sealing center tube by a second shear pin. The interlayer sealing center tube is provided with a side hole, through which the liquid pushes the liquid cylinder downward, thereby releasing the lower cup.

[0014] The method for using the integrated fracturing, filling, and commissioning tubing system with a stationary tubing string mentioned in this invention includes the following steps: First, the integrated fracturing, filling, and production string, consisting of a stationary tubing string and a layered fracturing and filling production line, is lowered into the designed downhole position via tubing. The upper sand control screen faces the upper oil and gas reservoir, and the lower sand control screen faces the lower oil and gas reservoir. Then, at the wellhead on the surface, the first soluble ball is inserted into the tubing and placed into the lower ball seat. Pressure is applied using a pump truck, and the pressure enters the hydraulic cylinder through the side hole of the interlayer sealing center pipe. This shears the second shear pin, causing the hydraulic cylinder to move downwards, releasing the compressed lower casing cup, which then seals against the inner wall of the casing, separating the upper and lower oil and gas reservoirs. As the pressure continues to rise, the fourth shear pin of the lower ball seat is sheared, falling onto the lower step of the lower filling port of the lower filling sleeve. At this point, gravel slurry pumped in by the surface pump truck flows through the tubing, through the integrated fracturing, filling, and production string, and through the lower filling port of the lower filling sleeve into the lower oil and gas reservoir, completing the fracturing and filling operation of the lower oil and gas reservoir. 2. After the fracturing and filling operation of the lower oil and gas reservoir is completed, backwashing is carried out. The backwashing fluid goes down along the annulus of the casing through the upper cup of the upper filling tool and the lower cup of the interlayer packer, enters the inner cavity of the tubing string through the lower filling port of the lower filling sleeve, and then returns to the surface wellhead through the tubing to clean up the excess gravel and slurry. Third, at the wellhead on the ground, the second soluble ball is dropped along the tubing. The second soluble ball falls into the ball seat of the lower sleeve of the lower sleeve, cutting off the third shear pin, causing the lower sleeve to fall and close the lower filling port of the lower filling sleeve. At the same time, the snap ring is locked in the outer groove of the lower sleeve. Fourth, the third soluble ball is then placed into the upper sliding sleeve ball seat of the upper sliding sleeve, cutting off the shear pins of the upper sliding sleeve and the opening sleeve, which fall to the upper end face of the inner tube. At this time, the opening sleeve moves down, connecting the liquid passage hole with the outer liquid passage hole, allowing the liquid to flow out along the liquid passage hole, the outer liquid passage hole and the cut on the cutting sleeve, so that the oil and gas reservoir and the tubing are connected; and the fall of the upper sliding sleeve exposes the upper filling port of the upper filling sleeve. At this time, the gravel slurry pumped in by the pump truck on the ground is pumped from the tubing into the integrated fracturing and filling production string of the stationary tubing string, passing through the upper filling port of the upper filling sleeve, and entering the upper oil and gas reservoir between the upper cup and the lower cup of the interlayer packer, so as to realize the fracturing and filling construction of the upper oil and gas reservoir. Fifth, after the fracturing and filling of the upper oil and gas reservoir is completed, backwashing is carried out. The backwashing fluid enters the inner cavity of the tubing string through the annulus of the casing and the upper filling port of the upper filling tool, and then returns to the wellhead on the surface through the tubing to clean up the excess gravel and slurry, and then gas lift production is carried out.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: I. This invention involves inserting a first soluble ball into the lower ball seat, pressurizing it with a pump truck, and then using the pressure to enter the liquid cylinder through the side hole of the interlayer sealing center tube. This cuts off the second shear pin, causing the liquid cylinder to move downward and releasing the compressed lower cup, which then adheres tightly to the inner wall of the casing to effectively isolate the upper and lower oil and gas reservoirs. Pressurization continues, and the lower ball seat falls below the lower filling port of the lower filling sleeve, opening the filling channel to the lower oil and gas reservoir for fracturing and filling operations. Second, by inserting the second soluble ball into the ball seat of the lower sleeve, the lower sleeve falls and closes the lower filling port. At the same time, the retaining spring is locked in the outer groove of the lower sleeve to prevent sand from coming out due to incomplete closure of the lower filling port. The first and second soluble balls can be washed out by backwashing. If they are not washed out by backwashing, they can be dissolved after a period of time. Third, by inserting a third soluble ball into the upper sliding sleeve ball seat of the upper sliding sleeve, the upper sliding sleeve and the opening sleeve fall down. At this time, the opening sleeve moves down to a lower position, allowing communication between the oil and gas reservoir and the oil pipeline. The falling of the upper sliding sleeve opens the upper filling port, opening the filling channel of the upper oil and gas reservoir for fracturing and filling construction. After the upper and lower oil and gas reservoirs are both fracturing and filled, they can be put into production by gas lift.

[0016] This invention is simple to operate and effectively integrates the opening and closing of the layered filling port, selective fracturing and sand control, backwashing, and gas lift production, which can maximize the development effect of gas wells and reduce production and operation costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an enlarged schematic diagram of the upper part of the present invention; Figure 3 This is an enlarged schematic diagram of the lower half of the present invention; Figure 4 This is a schematic diagram of the upper sliding sleeve; Figure 5 This is an enlarged schematic diagram of the connecting sleeve, door opening sleeve, and seam sleeve. Figure 6 This is a structural schematic diagram of the interlayer packer section; Figure 7 This is a structural diagram of the lower filling tool section; Figure 8 This is a schematic diagram showing the lower diaphragm cup being released as the first soluble ball liquid cylinder is lowered. Figure 9 This is a schematic diagram showing the initiation of lower oil and gas reservoir filling after the lower ball seat is lowered; Figure 10 This is a schematic diagram showing the insertion of the second soluble ball and the closure of the lower filling port; Figure 11 This is a schematic diagram of the insertion of the third soluble ball to initiate the filling of the upper oil and gas reservoir; In the diagram: 1. Upper filling tool; 2. Upper sand screen pipe; 3. Interlayer packer; 4. Lower filling tool; 5. Lower sand screen pipe; 6. Upper connector; 7. Upper sliding sleeve; 8. Upper filling sleeve; 9. Leather cup seat; 10. Upper leather cup; 11. Soluble ring; 12. Central tube; 13. Connecting sleeve; 14. Door opening sleeve; 15. Slit sleeve; 16. Inner tube; 17. Sealing insert; 18. Sealing sleeve; 19. Leather cup cap; 20. Lower leather cup; 21. Interlayer sealing central tube; 22. Liquid cylinder; 23. Connecting connector; 24. Lower sliding sleeve; 25. Snap ring; 26. Lower ball seat; 27. Lower filling sleeve; 28. First soluble ball; 29. ​​Second soluble ball; 30. Third soluble ball. 7.1 Upper sliding sleeve connector, 7.2 Upper sliding sleeve body, 7.3 Upper sliding sleeve ball seat, 7.4 Upper sliding sleeve limiting protrusion, 7.5 Upper sliding sleeve sealing groove, 13.1 External liquid passage hole, 14.1 Door opening sleeve shear pin, 14.2 Liquid passage hole, 15.1 Cut, 21.1 Side hole, 22.1 Lower protective ring, 22.2 Second shear pin, 23.1 Connecting joint ball seat, 23.2 Third shear pin, 24.1 Lower sliding sleeve ball seat, 27.1 Fourth shear pin, 27.2 Lower filling port. Detailed Implementation

[0018] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0019] Example 1, referring to Figures 1-3The present invention mentions an integrated fracturing and filling production line for stationary tubing, comprising an upper filling tool 1, an upper sand control screen 2, an interlayer packer 3, a lower filling tool 4, and a lower sand control screen 5. The lower end of the upper filling tool 1 is connected to the upper sand control screen 2, and the lower end of the lower filling tool 4 is connected to the lower sand control screen 5. An interlayer packer 3 is installed between the upper sand control screen 2 and the lower filling tool 4. The upper filling tool 1 includes an upper connector 6, an upper sliding sleeve 7, an upper filling sleeve 8, a cup seat 9, an upper cup 10, a central tube 12, a connecting sleeve 13, an opening sleeve 14, a slit sleeve 15, and an inner tube 16. The upper end of the central tube 12 is connected to the upper connector 6 through the upper sliding sleeve 7, the upper filling sleeve 8, and the cup seat 9. The cup seat 9 is installed on the upper outer wall of the central tube 12. The upper filling sleeve 8 is installed on the upper part of the cup seat 9, and the upper filling sleeve 8 has an upper filling port. The upper cup 10 is installed on the lower part of the cup seat 9. The connecting sleeve 13, the opening sleeve 14, and the slit sleeve 15 are installed on the lower end of the central tube 12. The lower end of the connecting sleeve 13 is connected to the inner tube 16. The lower filling tool 4 includes a connecting joint 23, a sliding sleeve 24, a lower ball seat 26, and a lower filling sleeve 27. The sliding sleeve 24 is installed on the lower inner wall of the connecting joint 23, and the lower filling sleeve 27 is installed on the lower outer side of the connecting joint 23. A lower filling port 27.2 is provided on the lower filling sleeve 27. The lower ball seat 26 is fixedly connected to the inner wall of the lower filling sleeve 27 by a fourth shear pin 27.1, and the lower ball seat 26 is located above the lower filling port 27.2.

[0020] The aforementioned interlayer packer 3 includes a sealing sleeve 18, a leather cup cap 19, a lower leather cup 20, an interlayer sealing center tube 21, and a liquid cylinder 22. The leather cup cap 19 is installed on the upper side of the interlayer sealing center tube 21, the lower leather cup 20 is installed on the lower side of the leather cup cap 19, the liquid cylinder 22 is installed on the lower side of the interlayer sealing center tube 21, and the upper side of the leather cup cap 19 is connected to the sealing sleeve 18.

[0021] The lower end of the inner tube 16 is connected to the upper end of the sealing tube 17 by a thread. The lower end of the sealing tube 17 is inserted into the inner wall of the sealing sleeve 18. The upper end of the sealing sleeve 18 is connected to the lower end of the upper sand screen tube 2. The lower end of the sealing sleeve 18 is connected to the upper end of the leather cup cap 19.

[0022] Reference Figure 4The upper sliding sleeve 7 mentioned in this invention includes an upper sliding sleeve connector 7.1, an upper sliding sleeve body 7.2, an upper sliding sleeve ball seat 7.3, an upper sliding sleeve limiting protrusion 7.4, and an upper sliding sleeve sealing groove 7.5. The upper sliding sleeve body 7.2 is provided with an upper sliding sleeve connector 7.1 at its upper end. The inner wall of the upper sliding sleeve connector 7.1 is provided with an upper sliding sleeve ball seat 7.3 for receiving the third soluble ball 30. The upper sliding sleeve limiting protrusion 7.4 is provided on the outer wall of the upper sliding sleeve connector 7.1 for contacting the upper end of the central tube 12 to limit the upper sliding sleeve 7. The upper sliding sleeve sealing groove 7.5 is provided on the outer side of the upper end of the upper sliding sleeve connector 7.1.

[0023] The upper cup 10 is equipped with a soluble ring 11, which makes the upper cup 10 form a funnel-shaped structure with the wide opening at the bottom and the narrow opening at the top. After being lowered into the well for a period of time, the soluble ring 11 melts and the upper cup 10 is released. The upper filling sleeve 8 is provided with an upper filling port. Before the upper sliding sleeve 7 moves down, it is sealed by the sealing ring installed on the outer wall of the upper sliding sleeve joint 7.1 and the upper sliding sleeve limiting protrusion 7.4. After the upper sliding sleeve 7 moves down, the upper filling sleeve 8 exposes the upper filling port.

[0024] Reference Figure 5 The lower end of the central tube 12 mentioned in this invention is equipped with a connecting sleeve 13. The inner side of the lower end of the connecting sleeve 13 is connected and fixed to the opening sleeve 14 by the opening sleeve shear pin 14.1. The opening sleeve 14 is provided with a liquid passage hole 14.2. The outer side of the lower end of the connecting sleeve 13 is connected to the slit sleeve 15. The slit sleeve 15 is provided with slits 15.1. The lower end of the connecting sleeve 13 is connected to the upper end of the inner tube 16. The middle part of the connecting sleeve 13 is provided with an outer liquid passage hole 13.1. After the opening sleeve shear pin 14.1 is cut off, the opening sleeve 14 moves down, so that the liquid passage hole 14.2 communicates with the outer liquid passage hole 13.1, so that the liquid flows out along the liquid passage hole 14.2, the outer liquid passage hole 13.1 and the slits 15.1 on the slit sleeve 15.

[0025] Reference Figure 6 The upper inner wall of the connecting joint 23 mentioned in this invention is connected to the lower end of the interlayer sealing center tube 21 by a thread. The upper part of the inner wall of the connecting joint 23 is provided with a connecting joint ball seat 23.1, and the lower part of the connecting joint ball seat 23.1 is provided with a third shear pin 23.2. The sliding sleeve 24 is fixedly connected by the third shear pin 23.2. The lower filling sleeve 27 is installed on the lower side of the outer wall of the connecting joint 23, and the lower end of the connecting joint 23 is installed with a retaining spring 25.

[0026] The inner wall of the sliding sleeve 24 is provided with a sliding sleeve ball seat 24.1 for receiving the second soluble ball 29, and the lower filling sleeve 27 is provided with a lower filling port 27.2 on its lower side.

[0027] Reference Figure 7The upper end of the liquid cylinder 22 mentioned in this invention is provided with a lower protective ring 22.1, which locks and protects the lower cup 20. The upper side of the liquid cylinder 22 is fixed to the outer wall of the interlayer sealing center tube 21 by a second shear pin 22.2. The interlayer sealing center tube 21 is provided with a side hole 21.1. The liquid in the side hole 21.1 pushes the liquid cylinder 22 downward, thereby releasing the lower cup 20.

[0028] The method for using the integrated fracturing, filling, and commissioning tubing system with a stationary tubing string mentioned in this invention includes the following steps: First, the integrated fracturing, filling, and production fracturing string is lowered into the designed downhole position via tubing. The upper sand screen 2 faces the upper oil and gas reservoir, and the lower sand screen 5 faces the lower oil and gas reservoir. Then, referring to... Figure 8 At the wellhead on the surface, the first soluble ball 28 is inserted into the tubing and placed into the lower ball seat 26. Pressure is applied using a pump truck, and the pressure enters the hydraulic cylinder 22 through the side hole 21.1 of the interlayer sealing center pipe 21. This shears the second shear pin 22.2, causing the hydraulic cylinder 22 to move downwards, releasing the compressed lower rubber cup 20, which then seals against the inner wall of the casing, thus separating the upper and lower oil and gas reservoirs. (Refer to...) Figure 9 As the pressure continues to rise, the fourth shear pin 27.1 of the lower ball seat 26 is sheared off and falls on the step below the lower filling port 27.2 of the lower filling sleeve 27. At this time, the gravel slurry pumped in by the pump truck on the ground passes through the oil pipe and the integrated fracturing and filling production string of the stationary string, and enters the lower oil and gas reservoir through the lower filling port 27.2 of the lower filling sleeve 27, realizing the fracturing and filling construction of the lower oil and gas reservoir. Among them, the first soluble ball 28 not only plays the role of pressurizing and releasing the interlayer packer 3 and opening the lower filling port 27.2, but also plays the role of blocking the gravel slurry from entering the lower sand screen pipe 5 during fracturing and filling. 2. After the fracturing and filling operation of the lower oil and gas reservoir is completed, backwashing is carried out. The backwashing fluid goes down along the annulus through the upper cup 10 of the upper filling tool 1 and the lower cup 20 of the interlayer packer 3, enters the inner cavity of the tubing string through the lower filling port 27.2 of the lower filling sleeve 27, and then returns to the surface wellhead through the tubing to clean up the excess gravel and slurry. III. Then, refer to Figure 10 At the wellhead on the ground, the second soluble ball 29 is dropped along the tubing. The second soluble ball 29 falls on the ball seat 24.1 of the lower sleeve 24, cutting the third shear pin 23.2, causing the lower sleeve 24 to fall down and close the lower filling port 27.2 of the lower filling sleeve 27. At the same time, the snap ring 25 is locked in the outer groove of the lower sleeve 24. IV. Reference Figure 11Then, the third soluble ball 30 is placed at the upper sliding sleeve ball seat 7.3 of the upper sliding sleeve 7, cutting off the upper sliding sleeve 7 and the opening sleeve shear 14.1 of the opening sleeve 14 and dropping it to the upper end face of the inner tube 16. At this time, the opening sleeve 14 moves down, so that the liquid passage hole 14.2 is connected with the outer liquid passage hole 13.1, so that the liquid flows out along the liquid passage hole 14.2, the outer liquid passage hole 13.1 and the cut 15.1 on the cut sleeve 15, so that the oil and gas reservoir and the oil pipe are connected; and the fall of the upper sliding sleeve 7 exposes the upper filling port of the upper filling sleeve 8. At this time, the gravel slurry pumped in by the pump truck on the ground is pumped from the oil pipe into the stationary tubing string for layered fracturing and filling production. After passing through the upper filling port of the upper filling sleeve 8, it enters the upper oil and gas reservoir between the upper cup 10 and the lower cup 20 of the interlayer packer 3, so as to realize the fracturing and filling construction of the upper oil and gas reservoir. Fifth, after the fracturing and filling of the upper oil and gas reservoir is completed, backwashing is carried out. The backwashing fluid enters the tubing cavity through the annulus of the casing and the upper filling port of the upper filling tool 1, and then returns to the wellhead on the surface through the tubing to clean up the excess gravel and slurry, and then gas lift production is carried out.

[0029] The above description is merely a partial preferred embodiment of the present invention. Any person skilled in the art can modify the above-described technical solutions or modify them into equivalent technical solutions. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A type of integrated fracturing, filling, and commissioning tubing string with a stationary tubing string, characterized in that: Including the upper layer The upper filling tool (1), the upper sand screen pipe (2), the interlayer packer (3), the lower filling tool (4), and the lower sand screen pipe (5) are connected to the lower sand screen pipe (2) and the lower filling tool (4). An interlayer packer (3) is installed between the upper sand screen pipe (2) and the lower filling tool (4). The upper filling tool (1) includes an upper connector (6), an upper sliding sleeve (7), an upper filling sleeve (8), a leather cup seat (9), an upper leather cup (10), a central tube (12), a connecting sleeve (13), an opening sleeve (14), a slit sleeve (15), and an inner tube (16). The upper end of the central tube (12) is connected to the upper connector (6) through the upper sliding sleeve (7), the upper filling sleeve (8), and the leather cup seat (9). The leather cup seat (9) is installed on the upper outer wall of the central tube (12). The upper filling sleeve (8) is installed on the upper part of the leather cup seat (9). The upper filling sleeve (8) is provided with an upper filling port. The upper leather cup (10) is installed on the lower part of the leather cup seat (9). The connecting sleeve (13), the opening sleeve (14), and the slit sleeve (15) are installed on the lower end of the central tube (12). The lower end of the connecting sleeve (13) is connected to the inner tube (16). The lower filling tool (4) includes a connecting joint (23), a sliding sleeve (24), a lower ball seat (26), and a lower filling sleeve (27). The sliding sleeve (24) is installed on the lower inner wall of the connecting joint (23), and the lower filling sleeve (27) is installed on the lower outer side of the connecting joint (23). A lower filling port (27.2) is provided on the lower filling sleeve (27). The lower ball seat (26) is fixedly connected to the inner wall of the lower filling sleeve (27) by a fourth shear pin (27.1), and the lower ball seat (26) is located above the lower filling port (27.2).

2. The integrated fracturing, filling, and commissioning tubing string according to claim 1, characterized in that: The interlayer packer (3) includes a sealing sleeve (18), a leather cup cap (19), a lower leather cup (20), an interlayer sealing center tube (21), and a liquid cylinder (22). The leather cup cap (19) is installed on the upper side of the interlayer sealing center tube (21), the lower leather cup (20) is installed on the lower side of the leather cup cap (19), the liquid cylinder (22) is installed on the lower side of the interlayer sealing center tube (21), and the upper side of the leather cup cap (19) is connected to the sealing sleeve (18).

3. The integrated fracturing, filling, and commissioning tubing string according to claim 2, characterized in that: The lower end of the inner tube (16) is connected to the upper end of the sealing tube (17) by a thread. The lower end of the sealing tube (17) is inserted into the inner wall of the sealing sleeve (18). The upper end of the sealing sleeve (18) is connected to the lower end of the upper sand screen tube (2). The lower end of the sealing sleeve (18) is connected to the upper end of the leather cup cap (19).

4. The integrated fracturing, filling, and commissioning tubing string according to claim 3, characterized in that: The upper sliding sleeve (7) includes an upper sliding sleeve connector (7.1), an upper sliding sleeve body (7.2), an upper sliding sleeve ball seat (7.3), an upper sliding sleeve limiting protrusion (7.4), and an upper sliding sleeve sealing groove (7.5). The upper sliding sleeve body (7.2) is provided with an upper sliding sleeve connector (7.1) at its upper end. The inner wall of the upper sliding sleeve connector (7.1) is provided with an upper sliding sleeve ball seat (7.3) for receiving the third soluble ball (30). The upper sliding sleeve limiting protrusion (7.4) is provided on the outer wall of the upper sliding sleeve connector (7.1) for contacting the upper end of the central tube (12) to limit the upper sliding sleeve (7). The upper sliding sleeve sealing groove (7.5) is provided on the outer side of the upper end of the upper sliding sleeve connector (7.1).

5. The integrated fracturing, filling, and commissioning tubing string according to claim 4, characterized in that: The upper cup (10) is provided with a soluble ring (11) so that the upper cup (10) forms a flared structure with the wide opening at the bottom and the narrow opening at the top; the upper filling sleeve (8) is provided with an upper filling port, and before the upper sliding sleeve (7) moves down, it is sealed by the sealing ring installed on the outer wall of the upper sliding sleeve joint (7.1) and the upper sliding sleeve limiting protrusion (7.4) of the upper sliding sleeve (7). After the upper sliding sleeve (7) moves down, the upper filling sleeve (8) exposes the upper filling port.

6. The integrated fracturing, filling, and commissioning tubing string according to claim 5, characterized in that: A connecting sleeve (13) is installed at the lower end of the central tube (12). The inner side of the lower end of the connecting sleeve (13) is connected and fixed to the opening sleeve (14) by the opening sleeve shear pin (14.1). The opening sleeve (14) is provided with a liquid passage hole (14.2). The outer side of the lower end of the connecting sleeve (13) is connected to the slit sleeve (15). The lower end of the connecting sleeve (13) is connected to the upper end of the inner tube (16). The middle part of the connecting sleeve (13) is provided with an outer liquid passage hole (13.1). After the opening sleeve shear pin (14.1) is cut off, the opening sleeve (14) moves down, so that the liquid passage hole (14.2) communicates with the outer liquid passage hole (13.1), so that the liquid flows out along the liquid passage hole (14.2), the outer liquid passage hole (13.1) and the slit (15.1) on the slit sleeve (15).

7. The integrated fracturing, filling, and commissioning tubing string according to claim 6, characterized in that: The upper inner wall of the connecting joint (23) is connected to the lower end of the interlayer sealing center tube (21) by a thread. The upper part of the inner wall of the connecting joint (23) is provided with a connecting joint ball seat (23.1), and the lower part of the connecting joint ball seat (23.1) is provided with a third shear pin (23.2). The sliding sleeve (24) is fixedly connected by the third shear pin (23.2). The lower filling sleeve (27) is installed on the lower side of the outer wall of the connecting joint (23), and the lower end of the connecting joint (23) is installed with a snap ring (25).

8. The integrated fracturing, filling, and commissioning tubing string according to claim 7, characterized in that: The inner wall of the sliding sleeve (24) is provided with a sliding sleeve ball seat (24.1) for receiving the second soluble ball (29), and the lower filling sleeve (27) is provided with a lower filling port (27.2) on the lower side.

9. The integrated fracturing, filling, and commissioning tubing string according to claim 8, characterized in that: The upper end of the liquid cylinder (22) is provided with a lower protective ring (22.1), which locks and protects the lower cup (20). The upper side of the liquid cylinder (22) is fixed to the outer wall of the interlayer sealing center tube (21) by a second shear pin (22.2). The interlayer sealing center tube (21) is provided with a side hole (21.1). The liquid in the side hole (21.1) pushes the liquid cylinder (22) downward, thereby releasing the lower cup (20).

10. A method for using the integrated fracturing, filling, and commissioning tubing string as described in claim 9, characterized in that: Includes the following processes: First, the integrated fracturing, filling, and production tubing string is lowered into the designed downhole position via tubing, with the upper sand screen (2) facing the upper oil and gas reservoir and the lower sand screen (5) facing the lower oil and gas reservoir. Then, at the wellhead on the surface, the first soluble ball (28) is inserted into the tubing into the lower ball seat (26), and pressure is applied using a pump truck. The pressure enters the hydraulic cylinder (22) through the side hole (21.1) of the interlayer sealing center pipe (21), shearing the second shear pin (22.2) to move the hydraulic cylinder (22) downward, compressing the lower cup. (20) Release, and seal with the inner wall of the casing to separate the upper and lower oil and gas reservoirs; as the pressure continues to rise, the fourth shear pin (27.1) of the lower ball seat (26) is sheared off and falls on the step at the lower filling port (27.2) of the lower filling sleeve (27); at this time, the gravel slurry pumped in by the pump truck on the ground passes through the oil pipe through the stationary tubing string and the integrated fracturing and filling production string, and enters the lower oil and gas reservoir through the lower filling port (27.2) of the lower filling sleeve (27), realizing the fracturing and filling construction of the lower oil and gas reservoir; 2. After the fracturing and filling construction of the lower oil and gas reservoir is completed, backwashing is carried out. The backwashing fluid goes down along the annulus through the upper cup (10) of the upper filling tool (1) and the lower cup (20) of the interlayer packer (3), enters the inner cavity of the tubing string through the lower filling port (27.2) of the lower filling sleeve (27), and then returns to the surface wellhead through the tubing to clean up the excess gravel and slurry. Third, at the wellhead on the ground, the second soluble ball (29) is dropped along the tubing. The second soluble ball (29) falls on the ball seat (24.1) of the lower sleeve (24), cutting off the third shear pin (23.2), causing the lower sleeve (24) to fall down and close the lower filling port (27.2) of the lower filling sleeve (27). At the same time, the snap ring (25) is locked in the outer groove of the lower sleeve (24). Fourth, insert the third soluble ball (30) into the upper sliding sleeve ball seat (7.3) of the upper sliding sleeve (7), and cut the opening sleeve shear pin (14.1) of the upper sliding sleeve (7) and the opening sleeve (14) to the upper end face of the inner tube (16). At this time, the opening sleeve (14) moves down, so that the liquid passage hole (14.2) is connected with the outer liquid passage hole (13.1), so that the liquid flows along the liquid passage hole (14.2), the outer liquid passage hole (13.1) and the cutting sleeve (15). The crack (15.1) flows out, allowing the oil and gas reservoir to communicate with the tubing; and the fall of the upper sliding sleeve (7) exposes the upper filling port of the upper filling sleeve (8). At this time, the gravel slurry pumped in by the pump truck on the ground is pumped from the tubing into the stationary tubing string for layered fracturing and filling production. After passing through the upper filling port of the upper filling sleeve (8), it enters the upper oil and gas reservoir between the upper cup (10) and the lower cup (20) of the interlayer packer (3), thus realizing the fracturing and filling construction of the upper oil and gas reservoir. Fifth, after the fracturing and filling construction of the upper oil and gas reservoir is completed, backwashing is carried out. The backwashing fluid enters the inner cavity of the tubing string through the annulus of the casing and the upper filling port of the upper filling tool (1), and then returns to the surface wellhead through the tubing to clean up the excess gravel and slurry, and then gas lift production is carried out.

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