Hydraulic ejector and hydraulic ejection double-sealing single-clamping fracturing combined string tool string

Abstract

The utility model provides a hydraulic ejector and a hydraulic ejection double-sealing single-clamping fracturing combined string tool string, the string tool string comprises the hydraulic ejector, and the hydraulic ejector comprises a body, a retaining ring, a fixing ring, a fixing piece, a nozzle, an integral nozzle sleeve and an inner sliding sleeve; before the ejector is started, the inner sliding sleeve seals all ejection holes of the ejector from the inside, the inner sliding sleeve is fixed to the fixing ring through the fixing piece, and after the nozzle is fixedly connected to the interior of the integral nozzle sleeve, the integral nozzle sleeve is fixedly connected to the body. According to the utility model, the bidirectional anchoring design is adopted, so that the overall stability and durability of a tubular column tool string are improved, and the risk of failure of the tubular column possibly caused by high pumping pressure and overlarge axial tension and pressure of the tubular column is effectively avoided; the field construction operation efficiency is effectively improved; the labor intensity and the safety risk are greatly reduced, the construction speed is increased by more than 50%, and a new efficient transformation means is provided for fracturing transformation operation of an oil well, especially an oil casing damaged well.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas field reservoir transformation, in particular to the technical field of realizing multi-stage hydraulic jet perforation and double-seal single-clamp fracturing joint construction in oil wells, specifically, to a hydraulic ejector and a hydraulic jet double-seal single-clamp fracturing joint pipe tool string. Background Art

[0002] In recent years, with the continuous expansion of oilfield development, wellbore problems such as casing damage and leakage have become increasingly prominent. Although wellbore repair can be achieved, it is difficult to achieve long-term effective plugging of the treated wellbore. The pressure bearing capacity is limited, and volume fracturing cannot be performed through the casing and annulus. The fracturing transformation process and scale are limited. For the construction and transformation of oilfield casing damaged wells, if the conventional double-seal single-card fracturing transformation construction mode is followed, the oil pipe transmission fire perforation + double-seal single-card fracturing process is used for fracturing construction. Every three sections require six drilling trips, including: lifting and lowering the oil pipe transmission gunpowder perforation, lifting and lowering the scraping drill, and lifting and lowering the double-seal single-card fracturing drill. There are many processes, low construction efficiency, high labor intensity, and time-consuming and labor-intensive problems. At the same time, the casing burrs are difficult to scrape after gunpowder perforation, and the packer is easily damaged, which seriously restricts the construction progress.

[0003] Therefore, it is of great significance to study a tool for the construction and reconstruction of oil well casing damage wells with simple procedures and high construction efficiency. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the above-mentioned deficiencies in the prior art. For example, one of the purposes of the utility model is to realize the double-seal single-card + hydraulic jet large-displacement fracturing and perforating joint construction of oil wells, especially wells with damaged casing, etc. The second purpose of the utility model is to reduce the labor intensity and safety risks of fracturing and transformation operations of oil wells, especially wells with damaged casing, and the third purpose of the utility model is to effectively improve the on-site construction efficiency of fracturing and transformation of oil wells, especially wells with damaged casing.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a hydraulic ejector on the one hand. The hydraulic ejector of the utility model is also called a sliding sleeve hydraulic ejector. The ejector includes a body, a check ring, a fixing ring, a fixing member, a nozzle, an integral nozzle sleeve and an inner sliding sleeve. Before the ejector is started, the inner sliding sleeve seals all the ejection holes of the ejector from the inside; the inner sliding sleeve is fixed to the fixing ring by a fixing member, and after the nozzle is fixedly connected to the inside of the integral nozzle sleeve, the integral nozzle sleeve is fixedly connected to the body.

[0006] Optionally, the injector further comprises a steel ball, and the steel ball and the inner sleeve move downward together to the lower step of the injector tool, so as to complete the opening action of the injector.

[0007] Optionally, the fixing member includes a shear pin, the upper part of which is designed as a T-shaped structure, and the lower part is designed with threads to be fixed to the inner sleeve through threaded connection.

[0008] Optionally, the integral nozzle sleeve is fixed to the body by threaded connection, and the nozzle is welded inside the integral nozzle sleeve.

[0009] Optionally, two combined seals are respectively installed on the upper end and the lower end of the outer surface of the inner sleeve, and the combined seal is composed of a sealing ring and a retaining ring.

[0010] Optionally, the stop ring is fixedly connected to the upper end of the inner part of the body to fix the inner sliding sleeve.

[0011] On the other hand, the utility model provides a hydraulic jet double-seal single-clamp fracturing combined pipe tool string, the tool string comprises: an oil pipe, a hydraulic safety joint, an upper erosion-resistant short joint, a lower erosion-resistant short joint, a hydraulic anchor, an upper packer, a throttling nozzle tool, an inner-clamp oil pipe, a sand adding tool, a check valve, a telescopic compensator, a lower packer, a guide wire plug and the above-mentioned sliding sleeve hydraulic ejector, and the internal components of the tool string are fixedly and sealedly connected.

[0012] Optionally, the oil pipe is a micro-coupling oil pipe combination, and the anti-erosion treatment on the surfaces of the upper erosion-resistant pup joint and the lower erosion-resistant pup joint includes nitriding surface treatment.

[0013] Optionally, the upper packer can be repeatedly set and released by relying on the internal and external pressure difference.

[0014] Optionally, the lower packer is repeatedly set and released by applying drilling pressure by lifting and lowering.

[0015] Optionally, the lower portion of the flow channel in the throttling nozzle tool adopts a gradient angle design and extends the vortex concentration area.

[0016] Optionally, the inner tubing of the card distance adopts a P110 tubing short-circuit + laser cladding method to achieve surface strengthening and control of the heat affected zone.

[0017] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0018] 1) The utility model firstly uses the double-seal single-clip tool on the pipe string to perform large-displacement fracturing construction, and then starts the sliding sleeve hydraulic ejector on the pipe string to perform hydraulic sandblasting and perforating operations. A large-displacement double-seal single-clip fracturing + hydraulic jetting combined operation can be achieved in one drilling trip, effectively improving the efficiency of on-site construction operations.

[0019] 2) The utility model greatly reduces labor intensity and safety risks, speeds up construction by more than 50%, and provides a new and efficient means for fracturing and transformation of oil wells, especially wells with damaged casing.

[0020] 3) The utility model adopts a bidirectional anchoring design, which improves the overall stability and durability of the tubing tool string and effectively avoids the risk of tubing failure caused by high pumping pressure and excessive axial pulling pressure of the tubing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects and / or features of the present invention will become more apparent through the following description in conjunction with the accompanying drawings, in which:

[0022] Figure 1 A schematic diagram of the structure of the sliding sleeve type hydraulic ejector before opening in Example 1 of the utility model is shown.

[0023] Figure 2 A schematic diagram of the structure of the sliding sleeve type hydraulic ejector after opening in Example 1 of the utility model is shown.

[0024] Figure 3 A schematic diagram of the structure of a hydraulic jet double-seal single-clip fracturing tool string in Example 2 of the utility model is shown.

[0025] Description of main reference numerals:

[0026] 1-body, 2-check ring, 3-fixing ring, 4-shear nail, 5-sealing ring, 6-retaining ring, 7-nozzle, 8-integral nozzle sleeve, 9-inner sliding sleeve, 10-steel ball, 11-oil pipe, 12-hydraulic safety joint, 13-upper anti-erosion short joint, 14-sliding sleeve hydraulic ejector, 15-lower anti-erosion short joint, 16-hydraulic anchor, 17-upper packer, 18-throttling nozzle tool, 19-card distance inner oil pipe, 20-sand adding tool, 21-check valve, 22-telescopic compensator, 23-lower packer, 24-guide wire plug, 25-lower step. DETAILED DESCRIPTION

[0027] Hereinafter, the hydraulic ejector and the hydraulic ejector double-seal single-clamp fracturing combined pipe string tool string of the present invention will be described in detail in conjunction with exemplary embodiments.

[0028] Exemplary Embodiment 1

[0029] The present exemplary embodiment provides a sliding sleeve type hydraulic ejector, the ejector comprising a body, a check ring, a fixing ring, a fixing member, a nozzle, an integral nozzle sleeve and an inner sliding sleeve. Before the ejector is started, the inner sliding sleeve seals all the ejection holes of the ejector from the inside; the inner sliding sleeve is fixed to the fixing ring by a fixing member, and after the nozzle is fixedly connected to the inside of the integral nozzle sleeve, the integral nozzle sleeve is fixedly connected to the body.

[0030] In this embodiment, when the inner sleeve seals all the injection holes of the sliding sleeve type hydraulic ejector from the inside, the sliding sleeve type hydraulic ejector does not work. When it is necessary to open the sliding sleeve type hydraulic ejector for hydraulic sandblasting and perforating, a steel ball of a corresponding matching size can be thrown from the wellhead into the pipe string and pumped to the upper position of the inner sleeve of the sliding sleeve type hydraulic ejector. The pressure in the pipe string can shear off the fixing (the shearing pressure of the fixing is 12-15 MPa), and then the steel ball and the inner sleeve go down together to the lower step of the sliding sleeve type hydraulic ejector tool, and isolate the inside of the pipe string from top to bottom. At this time, the sliding sleeve type hydraulic ejector completes the opening action and can start the hydraulic sandblasting and perforating operation.

[0031] The inner sleeve is fixed to the fixing ring by a fixing part, and after the nozzle can be welded inside the integral nozzle sleeve, the integral nozzle sleeve can be fixed to the body by a threaded connection. Two combined seals are designed and installed on the upper and lower ends of the outer surface of the inner sleeve, respectively. The combined seal consists of a sealing ring and a retaining ring. Then the fixing ring, the fixing part, the sealing ring and the retaining ring are installed together at a specified position inside the body. The purpose of designing two combined seals on the upper and lower ends of the outer surface of the inner sleeve is to enable the sliding sleeve hydraulic ejector to meet the requirements of long-term high-pressure sealing before it is started. The combined sealing method composed of the sealing ring and the retaining ring can reliably achieve long-term high-pressure sealing downhole.

[0032] In this embodiment, the fixing member may include a shear pin, and the lower half of the shear pin may be designed with a thread to be fixed with the inner sleeve by a threaded connection, and the upper half of the shear pin is designed as a T-shaped structure. The purpose is that when the steel ball is thrown to hold the pressure to shear the shear pin and open the sliding sleeve type hydraulic ejector, the cut lower half of the shear pin can still be fixed to the inner sleeve by the thread and move downward with the inner sleeve; the cut upper half of the shear pin can still be fixed to the fixing ring, that is, the cut upper and lower halves of the shear pin will not fall freely inside the ejector, thereby effectively avoiding the risk of the cut shear pin fragments clogging the inner hole of the nozzle and affecting the perforating operation during the hydraulic sandblasting perforating process.

[0033] In this embodiment, the stop ring can be installed on the upper end of the body through threads, and is used to fix the inner sleeve to prevent the inner sleeve from sliding out from the upper part before the sliding sleeve type hydraulic ejector is started.

[0034] Exemplary Embodiment 2

[0035] The present exemplary embodiment provides a hydraulic jet double-seal single-clamp fracturing combined tubing tool string, the tool string comprising: an oil pipe, a hydraulic safety joint, an upper erosion-resistant short joint, a lower erosion-resistant short joint, a hydraulic anchor, an upper packer, a throttling nozzle tool, an inner-clamp oil pipe, a sand adding tool, a check valve, a telescopic compensator, a lower packer, a guide wire plug and the above-mentioned sliding sleeve hydraulic jet, and the internal components of the tool string are fixedly and sealedly connected.

[0036] In this embodiment, each component in the tubing tool string can be connected by threaded sealing. The oil pipe is a micro-coupling oil pipe combination, which increases the flow area and reduces the friction resistance. The gradual angle design is adopted at the diameter change of the oil pipe string to eliminate the eddy current at the diameter change of the oil pipe string, so that the oil pipe string can meet the operation requirements of large-displacement oil pipe injection fracturing construction; the displacement of the oil pipe injection fracturing construction can reach 5 to 8m 3 / min (conventional oil pipes can usually only achieve a displacement of 3.5m 3 / min or less). At the same time, compared with conventional oil pipes, the oil pipe has a smaller outer diameter under the same specifications, which can ensure a larger gap between the pipe string and the inner wall of the casing, which is conducive to the forward and reverse circulation in the construction operation and reduces the risk of drill sticking during the drilling process.

[0037] In the present embodiment, compared with conventional oil pipe pup joints, the upper erosion-resistant pup joint and the lower erosion-resistant pup joint can be subjected to surface treatments such as nitriding on the surface of the pup joints, thereby improving the surface hardness and enhancing the erosion resistance of the pup joints, thereby effectively reducing the splash erosion damage to the upper and lower sections of the oil pipe of the sliding sleeve type hydraulic ejector during the hydraulic sandblasting perforating process, and avoiding the risk of pipe string breakage caused by splash erosion to the upper and lower sections of the oil pipe of the sliding sleeve type hydraulic ejector during the hydraulic sandblasting perforating process.

[0038] The upper packer is a large-diameter, high-strength packer that can be repeatedly set and unsealed by relying on the internal and external pressure difference. On the one hand, it can meet the operational requirements of large-displacement tubing injection fracturing construction, and on the other hand, it can facilitate acid replacement before fracturing and well backwashing after fracturing. The lower packer is a compression packer that can be repeatedly set and unsealed by applying drilling pressure by lifting and lowering. The lower packer is designed with a pressure balance valve and a reverse circulation valve mechanism, which can effectively prevent negative pressure from sticking the drill during the unsealing process. At the same time, effective reverse circulation can be achieved when the packer is set or unsealed, effectively reducing the risk of drill string sticking.

[0039] In this embodiment, the throttling nozzle tool can be made of 42CrMo material + surface nitriding to improve the erosion resistance. The lower part of the inner flow channel adopts a gradient angle design and extends the vortex concentration area, which can basically eliminate the vortex, thereby meeting the operational requirements of large-displacement oil pipe injection fracturing construction.

[0040] The inner-spacing tubing adopts the method of P110 tubing short-circuiting + laser cladding, and uses a high-energy laser beam to melt the cladding material and the substrate thin layer to achieve surface strengthening and control the heat-affected zone. While ensuring the strength of the substrate of the layered tubing, the hardness of its outer surface is greatly improved, and its surface hardness can reach HRC60, that is, the erosion resistance of the outer surface of the layered tubing is greatly improved, thereby effectively reducing the risk of erosion and perforation of the inner-spacing tubing due to local backflow at the position of the inner-spacing tubing facing the perforation hole.

[0041] The hydraulic jet double-seal single-clip fracturing combined tubing tool string based on the sliding sleeve hydraulic jet forms a bidirectional anchoring effect through the hydraulic anchor on the upper part of the tubing and the supporting slips of the lower packer on the lower part of the tubing. That is, the tubing tool string adopts a bidirectional anchoring design, which improves the overall stability and durability of the tubing tool string and effectively avoids the risk of tubing failure caused by high pumping pressure and excessive axial tensile pressure of the tubing.

[0042] The operation of the hydraulic jet double seal single card fracturing string tool string includes the following steps:

[0043] Step 1: Use a conventional hydraulic spray gun to complete hydraulic sandblasting perforation operations on the first three sections of the construction well from top to bottom.

[0044] Step 2: Drilling. Drilling is carried out according to the designed tool string connection, and the order from top to bottom is: tubing, hydraulic safety joint, upper anti-erosion short joint, sliding sleeve hydraulic ejector, lower anti-erosion short joint, hydraulic anchor, upper packer, throttle tool, inner tubing, sand adding tool, check valve, telescopic compensator, lower packer, guide wire plug, and lower the connected pipe string to the designated position of the first section of the construction well to ensure that the upper and lower packers in the pipe string can normally block the perforation points of the first section after being set.

[0045] Step 3: Set the lower packer. After lowering the string tool string to the designated position according to the construction design requirements, set the lower packer in the string by lifting and lowering the string and applying drilling pressure, and connect the wellhead device.

[0046] Step 4: Fracturing the first section. When the pumping volume in the tubing reaches the design requirements, the upper packer in the string is set under the pressure difference between the inside and outside of the string; at this time, the upper packer and the lower packer are both set and seal the first section, forming a double-sealed single-stuck string, and then the first section can be completed according to the normal fracturing process. The well can be opened and washed normally.

[0047] Step 5: Drag the pipe string to the second section and complete the fracturing construction of the second section. After completing the fracturing construction of the first section, drag the pipe string to the second section, and then complete the fracturing construction of the second section according to the requirements of steps 3 and 4, and place the jet washing well normally.

[0048] Step 6: Drag the pipe string to the third section and complete the fracturing construction of the third section. After completing the fracturing construction of the second section, drag the pipe string to the third section, and then complete the fracturing construction of the third section according to the requirements of steps three and four.

[0049] Step 7: Open the sliding sleeve hydraulic ejector. After completing the fracturing construction of the first three sections, drag the pipe string to the fourth section, first set the packer, then put the steel ball of the corresponding size into the pipe string from the wellhead and pump the steel ball to the upper position of the inner sleeve of the sliding sleeve hydraulic ejector, the pressure in the pipe string is held to cut the shear pins, and the steel ball and the inner sleeve go down together to the lower step of the sliding sleeve hydraulic ejector tool, and isolate the inside of the pipe string from top to bottom. At this time, the sliding sleeve hydraulic ejector completes the opening action.

[0050] Step 8: Hydraulic sandblasting perforation of sections 4-6. After the sliding sleeve hydraulic ejector is opened, the pipe string can be dragged to perform hydraulic sandblasting perforation on sections 4, 5 and 6 respectively. Before each perforation, ensure that the lower packer in the pipe string has been set.

[0051] Step 9: Pull out the drill and replace the drill tool. After completing the hydraulic sandblasting perforation operation of sections 4-6, pull out the drill and replace the next set of hydraulic jet double-seal single-cage fracturing combined string tool string based on sliding sleeve hydraulic jet, and complete the double-seal single-cage fracturing construction of sections 4-6 and the hydraulic sandblasting perforation operation of sections 7-9 according to the requirements of steps 3 to 8.

[0052] Step 10: Repeat step 9 to complete the hydraulic sandblasting perforation and double-seal single-card fracturing construction of the remaining section of the well according to the construction design requirements.

[0053] In order to better understand the above exemplary embodiments of the present invention, they are further described below with reference to specific examples.

[0054] Example 1

[0055] This example provides a sliding sleeve type hydraulic ejector, such as Figure 1 and Figure 2 As shown, it includes a body 1, a stop ring 2, a fixing ring 3, a shear pin 4, a sealing ring 5, a retaining ring 6, a nozzle 7, an integral nozzle sleeve 8, an inner sliding sleeve 9 and a steel ball 10. Figure 1 This is a schematic diagram of the structure of the sliding sleeve hydraulic ejector before opening. Figure 2The figure is a schematic diagram of the structure of the sliding sleeve hydraulic ejector after it is turned on. Before the sliding sleeve hydraulic ejector is started, the inner sleeve 9 seals all the ejection holes of the sliding sleeve hydraulic ejector from the inside, and the sliding sleeve hydraulic ejector does not work. When the sliding sleeve hydraulic ejector needs to be turned on for hydraulic sandblasting and perforating, a steel ball 10 of a corresponding matching size can be thrown from the wellhead into the pipe column and pumped to the upper position of the inner sleeve 9 of the sliding sleeve hydraulic ejector. The pressure in the pipe column can shear the shear pin 4 (the shear pin shearing pressure is 12-15MPa), and then the steel ball 10 and the inner sleeve 9 go down together to the lower step 25 of the sliding sleeve hydraulic ejector, and isolate the inside of the pipe column from top to bottom. At this time, the sliding sleeve hydraulic ejector completes the opening action and can start the hydraulic sandblasting and perforating operation.

[0056] The inner sleeve 9 is fixed to the fixing ring 3 by the shear pins 4. After the nozzle 7 is welded to the inside of the integral nozzle sleeve 8, the integral nozzle sleeve 8 is fixed to the body 1 by threaded connection. Two combined seals are designed and installed on the upper and lower ends of the outer surface of the inner sleeve 9, respectively. The combined seal is composed of a sealing ring 5 and a retaining ring 6. Then the fixing ring 3, shear pins 4, sealing ring 5 and retaining ring 6 are installed together at a specified position inside the body 1.

[0057] The lower half of the shear nail 4 is designed with a thread and is fixed to the inner sleeve 9 by thread connection. The upper half of the shear nail 4 is designed as a T-shaped structure. The purpose is that when the steel ball 10 is thrown to press and cut the shear nail 4 to open the sleeve-type hydraulic ejector, the cut lower half of the shear nail 4 can still be fixed on the inner sleeve 9 through the thread and move downward with the inner sleeve 9. The cut upper half of the shear nail 4 can still be fixed on the fixing ring 3, that is, the cut upper and lower halves of the shear nail 4 will not fall freely inside the tool, thereby effectively avoiding the risk of the cut shear nail 4 fragments clogging the inner hole of the nozzle and affecting the perforating operation during the hydraulic sandblasting perforating process.

[0058] The stop ring 2 is installed at the upper end of the body 1 through threads, and is used to fix the inner sleeve 9 to prevent the inner sleeve 9 from sliding out of the tool from the upper part before the sliding sleeve type hydraulic ejector is started.

[0059] Example 2

[0060] This example provides a hydraulic jet double seal single card fracturing joint string tool string, such as Figure 3 As shown, the tool string may include from top to bottom: oil pipe 11, hydraulic safety joint 12, upper erosion-resistant short joint 13, sliding sleeve hydraulic ejector 14, lower erosion-resistant short joint 15, hydraulic anchor 16, upper packer 17, throttling nozzle tool 18, inner oil pipe 19, sand adding tool 20, check valve 21, telescopic compensator 22, lower packer 23, guide wire plug 24, and the tool components may be connected by threaded sealing.

[0061] In this example, the oil pipe 11 is a micro-coupling oil pipe combination, which increases the flow area and reduces the friction resistance. The gradual angle design is adopted at the diameter change of the oil pipe 11 string to eliminate the vortex at the diameter change of the oil pipe 11 string, so that the oil pipe 11 string can meet the operation requirements of large-displacement oil pipe injection fracturing construction. The upper anti-erosion short section 13 and the lower anti-erosion short section 15 are subjected to surface treatments such as nitriding on the surface of the short section, which improves the surface hardness and enhances the anti-erosion performance of the short section, effectively reducing the splash erosion damage to the upper and lower sections of the oil pipe of the sliding sleeve hydraulic ejector 14 during the hydraulic sandblasting perforation process, and avoiding the risk of pipe column breakage caused by splash erosion of the upper and lower sections of the oil pipe of the sliding sleeve hydraulic ejector 14 during the hydraulic sandblasting perforation process.

[0062] The upper packer 17 is a large-diameter, high-strength packer that can be repeatedly set and unsealed by relying on the internal and external pressure difference. On the one hand, it can meet the operational requirements of large-volume tubing injection fracturing construction, and on the other hand, it can facilitate acid replacement before fracturing and backwashing operations after fracturing. The lower packer 23 is a compression packer that can be repeatedly set and unsealed by applying drilling pressure by lifting and lowering.

[0063] The throttle tool 18 is made of 42CrMo material + surface nitriding to improve the erosion resistance. The lower part of the inner flow channel adopts a gradient angle design and extends the vortex concentration area, which can basically eliminate the vortex, thereby meeting the operational requirements of large-displacement oil pipe injection fracturing construction. The inner oil pipe 19 of the card distance adopts the method of P110 oil pipe short connection + laser cladding. The cladding material and the thin layer of the substrate are melted by a high-energy laser beam to achieve surface strengthening and control the heat-affected zone. While ensuring the strength of the substrate of the inner oil pipe 19 of the card distance, the hardness of its outer surface is greatly improved. Its surface hardness can reach HRC60, which greatly improves the erosion resistance of the outer surface of the inner oil pipe 19 of the card distance, thereby effectively reducing the risk of erosion and perforation of the inner oil pipe of the card distance due to local backflow at the position of the inner oil pipe 19 facing the perforation hole.

[0064] The hydraulic jet double-seal single-clip fracturing combined tubing tool string based on the sliding sleeve hydraulic jet forms a bidirectional anchoring effect through the hydraulic anchor 16 on the upper part of the tubing and the supporting slips of the lower packer 23 on the lower part of the tubing, that is, the tubing adopts a bidirectional anchoring design, which improves the overall stability and durability of the tubing tool string and effectively avoids the risk of tubing failure caused by high pumping pressure and excessive axial tensile pressure of the tubing.

[0065] Although the present invention has been described above in conjunction with the exemplary embodiments and the accompanying drawings, it should be apparent to those skilled in the art that various modifications may be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A hydraulic ejector, characterized in that: The injector comprises a body, a stop ring, a fixing ring, a fixing part, a nozzle, an integral nozzle sleeve and an inner sliding sleeve. Before the injector is started, the inner sliding sleeve seals all the injection holes of the injector from the inside. The inner sliding sleeve is fixed to the fixing ring through a fixing piece, and after the nozzle is fixedly connected to the inside of the integral nozzle sleeve, the integral nozzle sleeve is fixedly connected to the body.

2. The hydraulic ejector according to claim 1, characterized in that: The injector further comprises a steel ball, which moves downward together with the inner sleeve to the lower step of the injector tool, so as to complete the opening action of the injector.

3. The hydraulic ejector according to claim 1, characterized in that: The fixing member comprises a shear nail, the upper part of which is designed as a T-shaped structure, and the lower part is designed with threads to be fixed with the inner sliding sleeve through threaded connection.

4. The hydraulic ejector according to claim 1, characterized in that: The integral nozzle sleeve is fixed to the body through threaded connection, and the nozzle is welded inside the integral nozzle sleeve.

5. The hydraulic ejector according to claim 1, characterized in that: Two combined seals are respectively installed on the upper end and the lower end of the outer surface of the inner sliding sleeve, and the combined seal is composed of a sealing ring and a retaining ring.

6. The hydraulic ejector according to claim 1, characterized in that: The stop ring is fixedly connected to the upper end of the inner part of the body and is used to fix the inner sliding sleeve.

7. A hydraulic jet double seal single clamp fracturing joint string tool string, characterized in that: The tool string comprises: an oil pipe, a hydraulic safety joint, an upper erosion-resistant short joint, a lower erosion-resistant short joint, a hydraulic anchor, an upper packer, a throttling nozzle tool, an inner oil pipe of the card spacing, a sand adding tool, a check valve, a telescopic compensator, a lower packer, a guide wire plug and a hydraulic ejector according to any one of claims 1 to 6, and the internal components of the tool string are fixedly and sealedly connected.

8. The hydraulic jet double-seal single-cage fracturing tool string according to claim 7 is characterized in that: The oil pipe is a micro-coupling oil pipe combination, and the anti-erosion treatment of the upper anti-erosion pup joint and the lower anti-erosion pup joint surface includes nitriding surface treatment.

9. The hydraulic jet double-seal single-cage fracturing tool string according to claim 7 is characterized in that: The upper packer can be repeatedly set and released by relying on the internal and external pressure difference; The lower packer is repeatedly set and released by applying drilling pressure by lifting and lowering.

10. The hydraulic jet double-seal single-cage fracturing tool string according to claim 7, characterized in that: The lower part of the flow channel in the throttling nozzle tool adopts a gradual angle design and extends the vortex concentration area; The inner oil pipe of the card distance adopts the method of P110 oil pipe short connection + laser cladding to achieve surface strengthening and control the heat affected zone.

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