Sliding sleeve opening and closing tool and application

Abstract

The invention belongs to the technical field of sand prevention of underground operation machinery, and discloses a sliding sleeve opening and closing tool and application. The sliding sleeve opening and closing tool is structurally characterized in that an upper connector and a lower connector are in threaded connection through a set screw, a blocking sleeve is in threaded connection with the upper connector, and a bilateral gripper is provided with a groove through the blocking sleeve and a condom gland; a cylindrical spiral compression spring is placed in the groove, a condom is in threaded connection with the upper connector, a shear pin is in threaded connection with the upper connector, a groove is formed in the tail end of the upper connector, an O-shaped sealing ring is arranged in the groove, and sealing of the upper connector and the lower connector is guaranteed. The sliding sleeve can be reliably opened or closed; opening and closing of the sliding sleeve can be verified; the sheath can be opened or closed again by repeatedly lifting and placing the sliding sleeve switch tool when the sheath is opened or closed by mistake due to misoperation; the sliding sleeve is provided with a safety connector mechanism and can be forcibly released.

Description

Technical Field

[0001] The invention belongs to the technical field of sand prevention for underground operation machinery, and in particular relates to a sliding sleeve switch tool and application thereof. Background Art

[0002] The sliding sleeve switch tool is an important part of the multi-layer gravel packing technology, and the multi-layer gravel packing technology is a trend of targeted and fine gravel packing and sand control technology for multiple oil layers.

[0003] The one-trip multi-layer gravel packing technology is relatively mature abroad. Foreign companies such as Halliburton and Schlumberger have relatively mature technologies. In China, it has been applied and promoted in CNOOC Zhanjiang Branch, but most of them provide services to foreign companies. In recent years, Shengli Oilfield Offshore Production Plant has begun to try to promote and apply it, but it has not yet formed a scale. Liaohe Oilfield currently does not have this technology to achieve one-trip multi-layer gravel packing.

[0004] At present, the sand prevention in straight and inclined wells is mainly done by single-layer filling. However, for production wells with multiple oil layers, the effect of gravel filling and sand prevention is poor due to the difference between layers. For multi-layer oil wells, the two-step filling and sand prevention method is mainly used, that is, first use the layered extrusion tool for layered gravel filling, then pull out the layered tool, and then lower the pipe string for cyclic filling. There are many construction procedures, resulting in a long construction period; the construction is not continuous, and the high sand ratio sand in the high-pressure filling stage cannot achieve the effect of filling the near-well area densely; the interference between layers is serious and cannot be avoided.

[0005] For sand control operations in multiple oil layers, especially in marine environments, economic cost and sand control effect are relatively important considerations. The traditional sand control mode has a long construction period, poor sand control effect, and a short sand control period. It is necessary to introduce this technology for promotion and application to shorten the construction period, improve the quality and period of sand control, and play a role in reducing costs, increasing efficiency, and improving construction quality.

[0006] A multi-layer gravel packing process is to carry out differentiated and targeted gravel packing and sand control operations on each layer of multiple oil layers. Each oil layer has a corresponding packing sleeve. This process requires that when gravel packing operations are carried out on a certain layer of multiple oil layers, the service string is lifted and lowered, and the corresponding packing sleeve is opened by using the corresponding sleeve switch tool to carry out gravel packing and realize the filling operation.

[0007] In the existing technical solutions, the opening or closing of the sleeve can be done by wire operation or oil pipeline. With ordinary switch tools, one trip of the tubing string can only open or close the sleeve individually, and continuous opening and closing cannot be achieved, let alone a multi-layer gravel filling operation.

[0008] Considering adopting the principle of the original switch tool, the switch step is used as an elastic step, and at the same time has two upper and lower steps, so that the sliding sleeve can be opened and closed by repeatedly pulling the switch tool.

[0009] However, the development of new sliding sleeve switch tools has the following difficulties:

[0010] ① Reliability: It must be ensured that the sleeve can be opened and closed smoothly. If it cannot be opened, the filling construction cannot be carried out. If the sleeve cannot be closed after filling, the filling sand and formation sand may enter the wellbore through the sleeve, resulting in sand control failure.

[0011] ② Verifiability: Whether the sleeve is open or closed, it can be verified, so that the next step can be determined. Whether the sleeve is open or closed, or cannot be opened or closed, it must be verifiable by technical means or operational means, so that it can be determined whether the construction is normal.

[0012] ③ Remediability: If the sleeve is opened or closed by mistake due to operating errors, the sleeve can be reopened or closed by repeatedly lifting and releasing the sleeve switch tool.

[0013] ④ Forced recovery: If there is a problem during the filling process or the switch tool is stuck, there must be a safety joint mechanism that can force the tool to be released to avoid more serious problems.

[0014] In view of this, it is necessary to design a novel sliding sleeve switch tool. Summary of the invention

[0015] In order to solve the problems existing in the prior art, the present invention provides a sliding sleeve switch tool and application, and the technical solution is as follows:

[0016] A sliding sleeve switch tool, the upper joint and the lower joint are threadedly connected by a set screw, the gear sleeve is threadedly connected to the upper joint, the double-sided gripper is covered by the gear sleeve and the safety sleeve, the double-sided gripper is provided with a groove, a cylindrical spiral compression spring is placed in the groove, the safety sleeve is threadedly connected to the upper joint, the shear pin is threadedly connected to the upper joint, a groove is provided at the tail end of the upper joint, an O-ring is provided in the groove to ensure the sealing of the upper joint and the lower joint.

[0017] Preferably, the double-sided gripper is provided with two grooves and two cylindrical helical compression springs.

[0018] Furthermore, the shear pin is an internal sealing structure.

[0019] A method for assembling a sliding sleeve switch tool comprises the following steps:

[0020] S1 Fix the upper joint to the vise and install the O-ring;

[0021] S2 Connect the stopper sleeve to the upper joint and tighten it with a pipe clamp;

[0022] S3 Evenly apply butter on the surface of the cylindrical helical compression spring and install it in the double-sided gripper;

[0023] S4 installs three sets of double-sided grippers and cylindrical helical compression springs in the groove of the upper joint, clamps them under the stopper, and binds and compresses them with thin wire;

[0024] S5 Put the condom into the upper joint and install the shear pin, screw it until it is flat, remove the burrs, and ensure that the pin is stressed at the same time;

[0025] S6 connects the lower joint and the upper joint and tightens them with a pipe clamp;

[0026] S7, drill 2-M8*20 threaded holes evenly at a position about 170mm from the right end of the lower joint, and install 2-M8*20 set screws, tighten until flat, and remove burrs.

[0027] A disassembly procedure for a sleeve switch tool comprises the following steps:

[0028] S1 Remove the set screws and fix the upper joint to the vise with the right end facing outwards;

[0029] S2 compresses and binds the double-sided grippers with wire;

[0030] S3 removes the lower joint and shear pin in sequence, and removes the condom;

[0031] S4 carefully loosens the rope and takes out the double-sided gripper and cylindrical helical compression spring;

[0032] After S5, remove the retaining sleeve and discard the removed O-ring and copper screws.

[0033] A field application of a sliding sleeve switch tool comprises the following steps:

[0034] S1 connects the sliding sleeve with the matching service string;

[0035] When S2 is lowered, confirm the relative position of the sleeve switch tool and the sleeve;

[0036] S3 confirms the relative position of the sealing cylinder and the sealing rod;

[0037] S4 slowly lifts up to close the sleeve, and determines the position based on the distance and corresponding error; turns on the pump and determines whether the sleeve is closed based on the pressure. If the sleeve is not closed, lower the string, lift it up again, and use the sleeve switch tool to close the sleeve immediately;

[0038] S5 is slowly lowered to open the sleeve, and the position is determined based on the distance and the corresponding error; the pump is turned on to determine whether the sleeve is open based on the pressure. If the sleeve is not open, the pipe string can be lifted and lowered again, and the sleeve can be closed immediately using the sleeve switch tool;

[0039] If there is resistance during the S6 switching process, the pin of the sliding sleeve switch tool can be cut off by lifting 25t to ensure that the switch tool can be removed.

[0040] Furthermore, the lowering speed is controlled at about 0.3 m / s, and the pressure applied when encountering resistance does not exceed 10 t.

[0041] The beneficial effects of the present invention compared with the prior art are:

[0042] ①Can reliably open or close the sliding sleeve;

[0043] ②It can verify the opening and closing of the sliding sleeve;

[0044] ③ If the sheath is opened or closed by mistake due to operating errors, it can be reopened or closed by repeatedly lifting and releasing the sliding sleeve switch tool;

[0045] ④The sliding sleeve has a safety joint mechanism that can force release. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0047] Figure 1 This is a schematic diagram of the structure of the sliding sleeve switch tool.

[0048] Among them: 1. Upper joint, 2. Stop sleeve, 3. Double-sided gripper, 4. Cylindrical spiral compression spring, 5. Safety condom, 6. Shear pin, 7. Lower joint, 8. O-ring, 9. Set screw. DETAILED DESCRIPTION

[0049] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical scheme of the present invention is now described in detail in conjunction with the following specific embodiments, but it should not be understood as limiting the scope of implementation of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment used can be obtained from commercial channels.

[0050] The tool consists of an upper joint 1, a stop sleeve 2, a double-sided gripper 3, a cylindrical spiral compression spring 4, a safety sleeve 5, a shear pin 6, a lower joint 7, an O-ring 8, a set screw 9 and the like.

[0051] The upper joint 1 and the lower joint 7 are threaded and connected; the stopper sleeve 2 and the safety sleeve 5 are used to press the double-sided gripper 3 to prevent it from being ejected under the action of the spring; the cylindrical helical compression spring 4 keeps the double-sided gripper 3 in a compressible and extensible state; the shear pin 6 connects the upper joint 1 and the lower joint 7. When the sliding sleeve cannot be opened or closed due to gravel jamming, the switch tool will be stuck and cannot be dragged. By increasing the pulling force and reaching the pin shear value, the shear pin 6 can be cut off to achieve release. The shear pin 6 is an internal sealing mechanism to ensure the sealing performance of the connection buckle; the set screw 9 ensures the reliability of the connection;

[0052] In summary, the main working principle of the tool sleeve switch tool is: the upper and lower step surfaces of the double-sided gripper 3 cooperate with the sleeve to realize the opening and closing of the sleeve. The double-sided gripper 3 is the core component of the switch tool, and the upper and lower right-angle steps can open and close the sleeve. The double-sided gripper 3 realizes elastic contraction through the cylindrical helical compression spring 4. When the switch tool goes down, the lower inclined surface contracts, the upper step cooperates with the sleeve, and the sleeve is pressed down to open the sleeve; when the switch tool goes up, the upper inclined surface is forced to contract, the lower step cooperates with the sleeve, and the sleeve is pulled up and pressed to close the sleeve.

[0053] The application scenario of this tool is: the sleeve switch tool is connected to the inner service string, and with the corresponding sealing rod, the switch tool and the sleeve depth are within the correct position error. The sleeve is in the open or closed state during construction and connected to the outer completion string.

[0054] The switch tool opens or closes the sliding sleeve through the action of the double-sided gripper 3 and the cylindrical spiral compression spring 4. The inner pipe column is lifted up to make the switch tool close the elastic sliding sleeve inside the sliding sleeve, and it is lowered to open it. After the sliding sleeve is opened or closed, the double-sided gripper of the switch tool retracts under the action of the limit sleeve, thereby lifting the sliding sleeve.

[0055] If a fault occurs when the gripper is retracted, the shear pin 6 is sheared off by lifting the pipe column 25t, rendering the elastic mechanism ineffective, thereby ensuring that the switch tool can smoothly pull out the sleeve.

[0056] Example 1

[0057] 1. Preparation

[0058] 1.1 Be familiar with the assembly relationship and assembly requirements of each part

[0059] 1.1.1 Familiar with assembly relationships

[0060] 1.1.2 Assembly requirements

[0061] Apply high-quality thread oil evenly to all male button ends;

[0062] All "O"-rings should be greased;

[0063] Thin-walled parts cannot be clamped too tightly;

[0064] The interference of the assembled rubber ring is 0.6-0.8mm;

[0065] Remove any burrs caused by assembly.

[0066] 1.2 Check and clean the parts

[0067] 1.2.1 Sign for parts;

[0068] 1.2.2 Check that all sealing surfaces and sealing rings are in good condition and free of damage, and clean all parts to remove iron filings and burrs.

[0069] 2 Start Assembly

[0070] 2.1 Fix the upper joint 1 to the vise and install the O-ring 8;

[0071] 2.2 Connect the stopper sleeve 2 to the upper joint 1 and tighten it with a pipe clamp;

[0072] 2.3 Apply butter evenly to the surface of the cylindrical helical compression spring 4 and install it in the double-sided gripper 3;

[0073] 2.4 Install three sets of double-sided grippers 3 and cylindrical helical compression springs 4 in the groove of the upper joint 1, clamp them under the stopper sleeve 2, and bind and compress them with thin wire;

[0074] 2.5 Put the condom 5 into the upper connector 1, and install the shear pin 6, screw it until it is flat, remove the burrs, and ensure that the pins are stressed at the same time;

[0075] 2.6 Connect the lower joint 7 and the upper joint 1 and tighten them with a pipe clamp;

[0076] 2.7 Drill 2-M8*20 threaded holes evenly distributed at a position about 170mm from the right end of the lower joint 7, and install the set screws 92-M8*20, tighten until flat, and remove burrs.

[0077] 3. Switch test

[0078] 3.1 First, connect a short section of oil pipe to each end of the SS type sliding sleeve switch tool;

[0079] 3.2 Insert the upper oil pipe nipple into the S-type sleeve from the sealing tube end;

[0080] 3.3 Connect the inserted oil pipe nipple to the hydraulic cylinder and support it with four oil pipe nipple to start the test;

[0081] 3.4 Sequentially record the values ​​of F1, F2, F3, and F4 when the test machine increases the tension four times during the closing process of the S-type sliding sleeve;

[0082] 3.5 Then connect the other end of the oil pipe nipple to the hydraulic cylinder, and use the above nipple as support to pull the SD tool switch out of the sealing cylinder;

[0083] 3.6 Record the values ​​F1 and F2 of the two pressure increases;

[0084] 3.7 Repeat steps 2, 3, and 4, then pull the SS type sliding sleeve switch tool out from the limit sleeve end and record the pulling force value F when it passes.

[0085] 4 Disassembly Procedure

[0086] 4.1 Remove the set screw 9 and fix the upper connector 1 to the vise with the right end facing outwards;

[0087] 4.2 Compress and bind the double-sided gripper 3 with wire;

[0088] 4.3 Remove the lower connector 7 and shear pin 6 in sequence, and remove the condom 5;

[0089] 4.4 Carefully loosen the rope and take out the double-sided gripper 3 and the cylindrical helical compression spring 4;

[0090] 4.5 Finally, remove the retaining sleeve 2 and discard the removed O-ring and copper screws.

[0091] 5 Field Application

[0092] 5.1 Connect the sleeve to the matching service string.

[0093] 5.2 Confirm the relative position of the sleeve switch tool and the sleeve when lowering.

[0094] 5.3 Confirm the relative position of the sealing cylinder and the sealing rod.

[0095] 5.4 Slowly pull up to close the sleeve, and determine the position based on the distance and corresponding error; turn on the pump and determine whether the sleeve is closed based on the pressure. If the sleeve is not closed, lower the pipe string, pull it up again, and use the sleeve switch tool to close the sleeve immediately.

[0096] 5.5 Slowly lower the sleeve to open it, and determine the position based on the distance and corresponding error; turn on the pump and determine whether the sleeve is open based on the pressure. If the sleeve is not open, lift the pipe column, lower it again, and use the sleeve switch tool to close the sleeve immediately.

[0097] 5.6 If there is any resistance during the switching process, the pin of the sliding sleeve switch tool can be cut off by lifting 25t to ensure that the switch tool can be removed.

[0098] 6. Notes

[0099] 6.1 The tubing entering the well must be clean, accurately measured, and free of defects such as cracks, punctures, leakage, and deep corrosion to prevent tubing leakage during the flushing process.

[0100] 6.2 Pay attention to protecting the seals and threads at both ends during tool transportation.

[0101] 6.3 When lifting and lowering the pipe string, the operation must be smooth and it is strictly forbidden to lift or release it suddenly.

[0102] 6.4 The connecting pipe column must have thread oil and ensure that the thread connection is in good condition.

[0103] 6.5 Before entering the well, check that the step surface of the switch tool is free of damage and has good elasticity.

[0104] 6.6 The lowering speed is controlled at about 0.3m / s, and the pressure applied when encountering resistance shall not exceed 10t.

[0105] 6.7 When opening and closing the sliding sleeve, move slowly, pay attention to the changes in the pointer of the weight gauge, and judge the position of the pipe string.

[0106] 6.8 If the switch tool is stuck, the pulling force can be increased to more than 250KN to cut off the shear pin and forcibly pull out the service pipe.

[0107] 6.9 Ensure good well control during the entire operation and prepare the blowout preventer when lowering the sand control string.

[0108] The above-described embodiments are only preferred embodiments of the present invention, but not all feasible embodiments of the present invention. For those skilled in the art, any obvious changes made thereto without departing from the principles and spirit of the present invention should be considered to be included in the scope of protection of the claims of the present invention.

Claims

1. A sliding sleeve switch tool, characterized in that: The upper joint (1) and the lower joint (7) are threadedly connected via a set screw (9), the stop sleeve (2) is threadedly connected to the upper joint (1), the double-sided gripper (3) is pressed by the stop sleeve (2) and the safety sleeve (5), the double-sided gripper (3) is provided with a groove, a cylindrical helical compression spring (4) is placed in the groove, the safety sleeve (5) is threadedly connected to the upper joint (1), the shear pin (6) is threadedly connected to the upper joint (1), the tail end of the upper joint (1) is provided with a groove, an O-ring 8 is provided in the groove to ensure the sealing of the upper joint (1) and the lower joint (7).

2. The sliding sleeve switch tool according to claim 1, characterized in that: The double-sided gripper (3) is provided with two grooves and two cylindrical helical compression springs (4).

3. The sliding sleeve switch tool according to claim 1, characterized in that: The shear pin (6) is an inner sealing structure.

4. The assembly method of the sliding sleeve switch tool according to claim 1, characterized in that: The following steps are involved: S1 Fix the upper joint (1) to the vise and install the O-ring (8); S2 Connect the stopper sleeve (2) to the upper joint (1) and tighten them with a pipe clamp; S3 evenly applies butter to the surface of the cylindrical helical compression spring (4) and installs it in the double-sided gripper (3); S4 installs three sets of double-sided grippers (3) and cylindrical helical compression springs (4) in the groove of the upper joint (1), clamps them under the stopper sleeve (2), and binds and compresses them with thin iron wire; S5: insert the condom (5) into the upper connector (1), install the shear pin (6), screw it until it is flat, remove the burrs, and ensure that the pin is stressed at the same time; S6 Connect the lower joint (7) and the upper joint (1) and tighten them with a pipe clamp; S7 is drilled evenly at a position about 170 mm from the right end of the lower joint (7) with 2-M8*20 threaded holes, and the set screws (9) 2-M8*20 are installed and tightened until flat, and the burrs are removed.

5. The method for disassembling a sliding sleeve switch tool according to claim 1, characterized in that: The following steps are involved: S1 Remove the set screw (9) and fix the upper connector (1) in a vise with the right end facing outward; S2 compresses and binds the double-sided gripper (3) with wire; S3 removes the lower connector (7) and the shear pin (6) in sequence, and removes the condom (5); S4 carefully loosens the rope and takes out the double-sided gripper (3) and the cylindrical helical compression spring (4); After S5, remove the stopper sleeve (2) and discard the removed O-ring and copper screw.

6. The use of the sliding sleeve switch tool according to claim 1, characterized in that: The following steps are involved: S1 connects the sliding sleeve with the matching service string; When S2 is lowered, confirm the relative position of the sleeve switch tool and the sleeve; S3 confirms the relative position of the sealing cylinder and the sealing rod; S4 slowly lifts up to close the sleeve, and determines the position based on the distance and corresponding error; turns on the pump and determines whether the sleeve is closed based on the pressure. If the sleeve is not closed, lower the string, lift it up again, and use the sleeve switch tool to close the sleeve immediately; S5 is slowly lowered to open the sleeve, and the position is determined based on the distance and the corresponding error; the pump is turned on to determine whether the sleeve is open based on the pressure. If the sleeve is not open, the pipe string can be lifted and lowered again, and the sleeve can be closed immediately using the sleeve switch tool; If there is resistance during the S6 switching process, the pin of the sliding sleeve switch tool can be cut off by lifting 25t to ensure that the switch tool can be removed.

7. The use of the sliding sleeve switch tool according to claim 1, characterized in that: The lowering speed is controlled at 0.3m / s, and the pressure applied when encountering resistance shall not exceed 10t.

Images