A non-welding repair device for coiled tubing and its use method

Abstract

The present invention discloses a non-welding type repair device for continuous oil tubing and a method for using the same, which belongs to the technical field of oil and gas field exploration and development. It solves the technical problem that the quality of the welds is poor and the reuse of the continuous oil tubing cannot be guaranteed when the continuous oil tubing is repaired by welding. The non-welding type repair device for continuous oil tubing is processed with a plurality of negative-angle serrated grooves on both sides of the outer surface of the connector. The negative-angle serrated grooves on the left and right sides have the same shape and are in opposite directions. Before repair, the connector is first subjected to an inward concave and diameter-reducing plastic deformation below the transition temperature of the connector, so that two sections of continuous oil tubing can be respectively inserted into the connector from both ends and fixed by metal glue, so that the connector is restored to a shape above the transition temperature. The repair of the continuous oil tubing is achieved by the contact pressure between the connecting oil tubing sections and the connector.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas field exploration and development, and particularly relates to a non-welding type repair device for a coiled tubing and a method for using the same. Background Art

[0002] Continuous tubing is widely used in drilling operations due to its small size, pressure operation, continuous tripping, fast operation cycle and low cost. Due to work needs, it is often very long, up to several thousand meters. Due to the harsh conditions of drilling and completion operations such as fracturing and sand flushing, the continuous tubing needs to withstand various forces, which often cause crack damage or even breakage. Due to the demand for economic benefits, the broken continuous tubing often needs to be repaired and connected. The current repair method usually adopts welding repair method. Before repair, the failed part needs to be cut off and the remaining pipe is repaired. However, the repair by welding method requires heat treatment after welding, and the quality of the weld after repair is often poor, which is not conducive to the continued reuse of the entire continuous tubing. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a non-welding repair device for coiled tubing and a method for using the same, so as to solve the technical problem that welding is used to repair coiled tubing, resulting in poor weld quality and the inability to ensure the reuse of the coiled tubing.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention discloses a non-welding type repair device for a coiled tubing, comprising a connector, a heating device is provided on the outside of the connector, and a first coiled tubing section and a second coiled tubing section are sheathed on the outside of the connector;

[0006] The connecting member is annular in shape, and a plurality of first negative angle serrated grooves and second negative angle serrated grooves are respectively provided on both sides of the outer surface of the connecting member; the first negative angle serrated grooves and the second negative angle serrated grooves have the same shape and are in opposite directions;

[0007] The connecting piece is made of nickel-titanium shape memory alloy material.

[0008] Furthermore, the transition temperature of the connecting part is greater than or equal to 50°C, and the length is 80-150 mm; the slope angle of the first negative angle serrated groove and the second negative angle serrated groove is 30°, the negative angle of the first negative angle serrated groove and the second negative angle serrated groove is -3 to -5°, the groove depth is 5 to 10% of the wall thickness of the connecting part, the tooth top width is 1-2 mm, and the tooth bottom width is 2-3 mm.

[0009] Furthermore, the first coiled tubing section and the second coiled tubing section have the same material, outer diameter and wall thickness.

[0010] Furthermore, when the connector is deformed below the transition temperature, the outer diameter of the connector after deformation is 0.3 to 0.5 mm smaller than the inner diameters of the first and second continuous tubing sections.

[0011] Furthermore, the number of the first negative-angle sawtooth grooves and the second negative-angle sawtooth grooves is 3 to 7.

[0012] The present invention also discloses a method for using the above-mentioned outer sleeve type connected oil pipe non-welding repair device, which includes the following steps when repairing the coiled oil pipe:

[0013] Step 1: First, the connector is deformed below the transition temperature. The maximum diameter of the deformed connector (3) is smaller than that of the first continuous oil pipe section (1) and the second continuous oil pipe section (2). Then, the repaired ends of the first continuous oil pipe section and the second continuous oil pipe section are flattened to form a conical section with an angle of 10 to 15 degrees. Then, the treated first continuous oil pipe section and the second continuous oil pipe section are inserted into the connector from both ends.

[0014] Step 2: Use metal glue to fill the conical surface of the cut formed after the first and second coiled tubing sections are inserted into the connector; then use a heating device to heat the connector and keep it warm to complete the repair of the coiled tubing.

[0015] Furthermore, the depths of the processed first coiled tubing section and the second coiled tubing section inserted into the connector are 1 / 2 of the length of the connector respectively.

[0016] Furthermore, the heating temperature is 50-75° C.; and the metal glue is AB type metal glue.

[0017] Furthermore, the insulation time is 15 to 40 minutes.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention discloses a non-welded repair device for coiled tubing. The device utilizes a connector as the repair material, which is made of a nickel-titanium memory alloy and heated by a heating device to achieve coiled tubing repair. The nickel-titanium memory alloy material has a plurality of first and second negative-angle serrated grooves of identical shape and opposite orientations on its outer surface. Before repair, when the material is deformed at its transition temperature, the connector forms a concave corrugated shape, with its inner diameter smaller than the outer diameter of the coiled tubing. After heat preservation, the connector regains its memory, and its outer diameter becomes larger than the inner diameter of the coiled tubing, thereby generating adhesion pressure and achieving coiled tubing connection repair. The material strength of the connector after memory restoration is greater than or equal to the material strength of the coiled tubing section, thereby improving the strength of the repaired section. Compared to connectors with smooth inner walls, the first and second negative-angle serrated grooves significantly increase the adhesion between the connector and the coiled tubing, improving the strength and quality of the repaired section and significantly increasing the service life and duration of the repaired coiled tubing.

[0020] The present invention discloses a method for using the non-welding coiled tubing repair device. When using the non-welding coiled tubing repair device to repair coiled tubing, a conical cutout with an angle of 10 to 15 degrees is simply machined on the repaired end face of the coiled tubing. A connector is then inserted, and the resulting conical gap is filled with AB-type high-strength metal glue, thereby ensuring the connection strength between the first and second coiled tubing sections. This method can repair the coiled tubing simply by heating it with a heating device and is applicable to repairing Lenox tubing made of various materials, regardless of the type of material. After repair, the connection strength between the first and second coiled tubing sections at the connector is greater than 100% of the connection strength of the tubing body, and the sealing strength is greater than 95% of the internal pressure resistance of the tubing body. The repaired coiled tubing can be used in a wide temperature range of -20°C to 220°C. This method offers low cost, high reliability, and high-quality repairs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural schematic diagram of a non-welding repair method for coiled tubing according to an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of a connector according to an embodiment of the present invention;

[0023] Figure 3 Schematic diagram of the structure of the sawtooth groove in the connecting piece according to an embodiment of the present invention;

[0024] Figure 4 This is an appearance diagram of the connector of the present invention after the outer diameter expands after deformation below the transition temperature;

[0025] Among them: 1-first continuous oil pipe section; 2-second continuous oil pipe section; 31-first negative angle serrated groove; 31-second negative angle serrated groove; 4-heating device, 5-high strength metal glue. DETAILED DESCRIPTION

[0026] To facilitate understanding of the features and effects of the present invention by those skilled in the art, the following provides a general description and definition of the terms and expressions used in the specification and claims. Unless otherwise indicated, all technical and scientific terms used herein have the ordinary meanings as understood by those skilled in the art regarding the present invention. In the event of conflict, the definitions in this specification shall prevail.

[0027] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0028] Herein, all features such as values, amounts, amounts, and concentrations defined in numerical ranges or percentage ranges are for brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to include and specifically disclose all possible subranges and individual values ​​within the range (including integers and fractions).

[0029] In this document, unless otherwise specified, “include,” “including,” “contains,” “has” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0030] In this document, for the sake of brevity, not all possible combinations of the various technical features in each embodiment or example are described. Therefore, as long as there are no contradictions in the combination of these technical features, the various technical features in each embodiment or example can be combined in any way, and all possible combinations should be considered to be within the scope of this specification.

[0031] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0032] The following examples were prepared using conventional instruments and equipment in the art. Experimental methods in the following examples, where specific conditions are not specified, were generally performed under conventional conditions or according to the conditions recommended by the manufacturer. The various raw materials used in the following examples, unless otherwise specified, were conventional commercially available products, with specifications conventional in the art. In the present specification and the following examples, unless otherwise specified, "%" indicates percentage by weight, "part" indicates parts by weight, and "ratio" indicates weight ratio.

[0033] Example 1

[0034] like Figure 1 As shown, a non-welding repair device for a jacketed oil pipe connection includes a connector 3, a heating device 4 is provided on the outside of the connector 3, and a first continuous oil pipe section 1 and a second continuous oil pipe section 2 are sheathed on the outside of the connector 3; the material of the connector 3 is nickel-titanium shape memory alloy and the shape is annular, as shown in FIG. Figure 2 As shown, a plurality of first negative-angle serrated grooves 31 and second negative-angle serrated grooves 32 are respectively provided on both sides of the outer surface of the connecting member 3; the first negative-angle serrated grooves 31 and the second negative-angle serrated grooves 32 have the same shape and are in opposite directions, the negative angle of the first negative-angle serrated grooves 31 and the second negative-angle serrated grooves 32 are -5°, the number of the first negative-angle serrated grooves 31 and the second negative-angle serrated grooves 32 are 5 respectively, the groove depth is 8% of the wall thickness of the connecting member 3, the tooth top width is 1.5 mm, the tooth bottom width is 2.5 mm, and the slope angle is 30°; the transition temperature of the connecting member 3 is 55°C, and the length is 100 mm;

[0035] When the connector 3 is above the transition temperature, the outer diameter of the connector 3 is 0.2 mm larger than the inner diameter of the first and second coiled tubing sections 1 and 2, and the wall thickness is the same as that of the first and second coiled tubing sections 1 and 2; Figure 4 As shown, when deformed below the transition temperature, the outer diameter of the connector 3 after deformation is 0.3 mm smaller than the inner diameter of the first continuous oil tubing section 1 and the second continuous oil tubing section 2, which is conducive to the first negative-angle serrated groove 31 and the second negative-angle serrated groove 32 being inserted into the connector 3.

[0036] Example 2

[0037] A non-welding repair device for a jacket-type connecting oil pipe differs from Example 1 in that the negative angle of the first negative-angle serrated groove 31 and the second negative-angle serrated groove 32 is -4°, the number of the first negative-angle serrated groove 31 and the second negative-angle serrated groove 32 is 7, the groove depth is 5% of the wall thickness of the connecting member 3, the tooth top width is 1.8 mm, the tooth bottom width is 2.8 mm, and the slope angle is 30°; the connecting member 3 has a transition temperature of 50°C and a length of 90 mm; when the connecting member 3 is above the transition temperature, the outer diameter of the connecting member 3 is 0.3 mm larger than the inner diameter of the first and second continuous oil pipe sections 1 and 2, and the wall thickness is the same as the wall thickness of the first and second continuous oil pipe sections 1 and 2; when deformed below the transition temperature, the outer diameter of the deformed connecting member 3 is 0.4 mm smaller than the inner diameter of the first and second continuous oil pipe sections 1 and 2. The remaining components and parameters are the same as Example 1.

[0038] Example 3

[0039] A non-welding repair device for a jacket-type connecting oil pipe differs from Example 1 in that the negative angles of the first negative-angle serrated groove 31 and the second negative-angle serrated groove 32 are -5°, there are three of the first negative-angle serrated groove 31 and the second negative-angle serrated groove 32, the groove depth is 9% of the wall thickness of the connecting member 3, the tooth top width is 1 mm, the tooth bottom width is 2 mm, and the slope angle is 30°; the connecting member 3 has a transition temperature of 70°C and a length of 140 mm; when the connecting member 3 is above the transition temperature, the outer diameter of the connecting member 3 is 0.4 mm larger than the inner diameter of the first and second continuous oil pipe sections 1 and 2, and the wall thickness is the same as the wall thickness of the first and second continuous oil pipe sections 1 and 2; when deformed below the transition temperature, the outer diameter of the deformed connecting member 3 is 0.5 mm smaller than the inner diameter of the first and second continuous oil pipe sections 1 and 2; the remaining components and parameters are the same as Example 1.

[0040] Example 4

[0041] A non-welding repair device for a jacket-type connecting oil pipe differs from Example 1 in that the negative angles of the first negative-angle serrated groove 31 and the second negative-angle serrated groove 32 are -5°, the number of the first negative-angle serrated groove 31 and the second negative-angle serrated groove 32 is 6, the groove depth is 6% of the wall thickness of the connecting member 3, the tooth top width is 1.8 mm, the tooth bottom width is 2 mm, and the slope angle is 30°; the connecting member 3 has a transition temperature of 65°C and a length of 150 mm; when the connecting member 3 is above the transition temperature, the outer diameter of the connecting member 3 is 0.35 mm larger than the inner diameter of the first and second continuous oil pipe sections 1 and 2, and the wall thickness is the same as the wall thickness of the first and second continuous oil pipe sections 1 and 2; when deformed below the transition temperature, the outer diameter of the deformed connecting member 3 is 0.45 mm larger than the inner diameter of the first and second continuous oil pipe sections 1 and 2. The remaining components and parameters are the same as Example 1.

[0042] The method for using the non-welding repair device for the jacket-type connecting oil pipe of Example 1 includes the following steps: first, deforming the connecting member 3 below the transition temperature; then, flattening the repaired ends of the first and second continuous oil pipe sections 1 and 2 to form conical sections with an angle of 10°; then, inserting the treated first and second continuous oil pipe sections 1 and 2 into the connecting member 3 from both ends thereof, so that the first and second continuous oil pipe sections 1 and 2 can be inserted, and the insertion depth of each continuous oil pipe section is half of the connecting member 3 (45 mm);

[0043] Step 2: Use AB-type high-strength filler to fill the conical surface formed by inserting the first and second coiled tubing sections 1 and 2 into the connector 3. Then, use the heating device 4 to heat the connector 3 to 50°C and keep it warm for 20 minutes to complete the repair of the coiled tubing.

[0044] The method for using the non-welding repair device for the jacket-type connecting oil pipe of Example 2 includes the following steps: first, deforming the connecting member 3 below the transition temperature; then, flattening the repaired ends of the first and second continuous oil pipe sections 1 and 2 to form conical sections with an angle of 10°; then, inserting the treated first and second continuous oil pipe sections 1 and 2 into the connecting member 3 from both ends thereof, so that the first and second continuous oil pipe sections 1 and 2 can be inserted, and the insertion depth of the two continuous oil pipe sections at each end is half of the connecting member 3 (50 mm);

[0045] Step 2: Use AB-type high-strength filler to fill the conical surface formed by inserting the first and second coiled tubing sections 1 and 2 into the connector 3. Then, use the heating device 4 to heat the connector 3 to 75°C and keep it warm for 15 minutes to complete the repair of the coiled tubing.

[0046] The method for using the non-welding repair device for the jacket-type connecting oil pipe of Example 3 includes the following steps: first, deforming the connecting member 3 below the transition temperature; then, flattening the repaired ends of the first and second continuous oil pipe sections 1 and 2 to form conical sections with an angle of 15°; then, inserting the treated first and second continuous oil pipe sections 1 and 2 into the connecting member 3 from both ends thereof, so that the first and second continuous oil pipe sections 1 and 2 can be inserted, and the insertion depth of the two continuous oil pipe sections at each end is half of the connecting member 3 (70 mm);

[0047] Step 2: Use AB-type high-strength filler to fill the conical surface formed by inserting the first and second coiled tubing sections 1 and 2 into the connector 3. Then, use the heating device 4 to heat the connector 3 to 75°C and keep it warm for 40 minutes to complete the repair of the coiled tubing.

[0048] The connection strength of the repaired coiled tubing at the connector 3 is greater than 90% of the tensile strength of the coiled tubing section 1, and the sealing strength is greater than 95% of the internal pressure resistance of the coiled tubing section 1; the operating conditions of the repaired coiled tubing are -20℃ to 220℃.

[0049] The above content is only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for using a non-welding repair device for a jacket-type connecting oil pipe, characterized in that: When performing coiled tubing repair, the following steps are included: Step 1: First, the connector (3) is deformed below the transition temperature, and the maximum diameter of the deformed connector (3) is smaller than that of the first continuous oil pipe section (1) and the second continuous oil pipe section (2). Then, the repaired ends of the first continuous oil pipe section (1) and the second continuous oil pipe section (2) are flattened to form a conical section with an angle of 10° to 15°. Then, the processed first continuous oil pipe section (1) and the second continuous oil pipe section (2) are inserted into the connector (3) from both ends thereof. Step 2: Use metal glue (5) to fill the conical surface of the cutout formed after the first continuous oil pipe section (1) and the second continuous oil pipe section (2) are inserted into the connecting piece (3); then use a heating device (4) to heat the connecting piece (3), and after keeping it warm, the repair of the continuous oil pipe is completed; The heating temperature is 50°C to 75°C; the metal glue is AB type metal glue; and the holding time is 15 to 40 minutes; The non-welding type repair device for the coiled tubing comprises a connector (3), a heating device (4) is provided on the outside of the connector (3), and a first coiled tubing section (1) and a second coiled tubing section (2) are sheathed on the outside of the connector (3); The connecting member (3) is annular in shape, and a plurality of first negative-angle sawtooth grooves (31) and second negative-angle sawtooth grooves (32) are respectively provided on both sides of the outer surface of the connecting member (3); the first negative-angle sawtooth grooves (31) and the second negative-angle sawtooth grooves (32) have the same shape and are in opposite directions; The connecting piece (3) is made of nickel-titanium shape memory alloy material; The transition temperature of the connecting member (3) is greater than or equal to 50°C, and the length is 80-150 mm; the slope angle of the first negative angle sawtooth groove (31) and the second negative angle sawtooth groove (32) is 30°, the negative angle of the first negative angle sawtooth groove (31) and the second negative angle sawtooth groove (32) is -3° to -5°, the groove depth is 5-10% of the wall thickness of the connecting member (3), the tooth top width is 1-2 mm, and the tooth bottom width is 2-3 mm.

2. The method for using the non-welding repair device for outer sleeve-type connecting oil pipe according to claim 1, characterized in that: The first continuous oil pipe section (1) and the second continuous oil pipe section (2) have the same material, outer diameter and wall thickness.

3. The method for using the non-welding repair device for outer sleeve-type connecting oil pipe according to claim 2 is characterized in that: When the connecting piece (3) is above the transition temperature, the outer diameter of the connecting piece (3) is 0.2-0.4 mm larger than the inner diameter of the first continuous oil pipe section (1) and the second continuous oil pipe section (2), and the wall thickness is the same as the wall thickness of the first continuous oil pipe section (1) and the second continuous oil pipe section (2).

4. The method for using the non-welding repair device for outer sleeve-type connecting oil pipe according to claim 2 is characterized in that: When the connecting piece (3) is deformed below the transition temperature, the outer diameter of the deformed connecting piece (3) is 0.3-0.5 mm smaller than the inner diameters of the first continuous oil pipe section (1) and the second continuous oil pipe section (2).

5. The method for using the non-welding repair device for outer sleeve-type connecting oil pipe according to claim 1 is characterized in that: The number of the first negative-angle sawtooth grooves (31) and the second negative-angle sawtooth grooves (32) is 3 to 7.

6. The method for using the non-welding repair device for outer sleeve-type connecting oil pipe according to claim 1 is characterized in that: The depths of the processed first continuous oil pipe section (1) and the second continuous oil pipe section (2) inserted into the connecting piece (3) are respectively 1 / 2 of the length of the connecting piece (3).

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