Rapid splicing device and splicing method for SAGD lifting operation temperature and pressure monitoring cable

Abstract

The invention relates to the technical field of temperature and pressure monitoring cable splicing, and provides an SAGD lifting operation temperature and pressure monitoring cable rapid splicing device and splicing method.The SAGD lifting operation temperature and pressure monitoring cable rapid splicing device comprises a protective sleeve and a tightening assembly, and the tightening assembly comprises a tightening connector, a tightening nut and a two-way taper sleeve; the inner protection pipe penetrates through the tightening connector and the two-way taper sleeve and is inserted into a proper position of the inner wall of the protection sleeve, the two-way taper sleeve is extruded by the tightening nut to deform, and therefore the inner protection pipe and the tightening connector are fixed together, it is ensured that the outer wall of the inner protection pipe is firmly connected to the inner wall of the protection sleeve, sealing is reliable, and the service life of the inner protection pipe is prolonged. Therefore, the external diameter of the temperature and pressure monitoring cable can be adapted, the temperature and pressure monitoring cable can be tightly connected, the temperature and pressure monitoring cable can be smoothly put down and recycled in a well, the continuing time is obviously shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of temperature and pressure monitoring cable splicing, in particular to a SAGD lifting and lowering operation temperature and pressure monitoring cable quick splicing device and splicing method. Background Art

[0002] In the development of modern oil and gas fields, especially for the exploitation of high-viscosity oil reservoirs such as heavy oil and viscous oil, high-temperature exploitation technologies such as SAGD (steam-assisted gravity drainage), fire drive and electric heating wells have been widely used. These technologies effectively reduce the viscosity of crude oil by increasing the temperature and pressure downhole, thereby improving the recovery rate. However, these high-temperature exploitation technologies also put forward more stringent requirements on downhole equipment and tools, especially the temperature and pressure monitoring cables used to monitor the downhole temperature and pressure in real time.

[0003] The temperature and pressure monitoring cable can provide real-time feedback of the temperature and pressure data in the downhole during the downhole production process, providing key information for production decision makers to ensure the safety and efficiency of the production process. However, due to the high temperature and high pressure characteristics of the downhole environment, the temperature and pressure monitoring cable is extremely susceptible to damage after long-term use, including but not limited to breakage, wear or performance degradation, and needs to be replaced or repaired.

[0004] The traditional splicing method of temperature and pressure monitoring cables is powerless in the face of these challenges. First, the operation method is complicated and requires professional technicians and complex tools and equipment, which not only increases the operating cost but also prolongs the maintenance time. Second, the traditional splicing process is time-consuming, which seriously affects the production progress, especially in high-temperature mining technologies such as SAGD that require continuous operation. This is particularly prominent. Third, the traditional splicing method has low reliability in high temperature and high pressure environments, and is prone to leakage or poor connection, posing a hidden danger to production safety.

[0005] In addition, traditional splicing methods may also cause changes in the outer diameter of the temperature and pressure monitoring cable, which not only affects its smooth lowering and recovery underground, but may also interfere with other equipment and tools underground. What is more serious is that in actual operations, due to the lack of effective splicing methods, once the temperature and pressure monitoring cable is damaged or needs to be replaced, it is often necessary to replace it as a whole, which not only increases production costs, but also increases the difficulty and risk of operation.

[0006] In summary, the traditional temperature and pressure monitoring cable splicing method can no longer meet the special needs of high-temperature downhole operations such as SAGD, fire drive and electric heating wells; therefore, there is an urgent need for a temperature and pressure monitoring cable splicing device and method that is easy to operate, short in time, highly reliable and does not change the outer diameter, so as to improve production efficiency and safety, reduce production costs, and provide strong technical support for modern oil and gas field development. Summary of the invention

[0007] The present invention provides a quick splicing device and method for temperature and pressure monitoring cables for SAGD lifting and lowering operations. The outer diameter of the temperature and pressure monitoring cables is adapted to the deformation of a bidirectional cone sleeve, and the cables are tightly connected to ensure smooth lowering and recovery in the well, significantly shorten the splicing time, and improve production efficiency, so as to solve the problems raised in the background technology.

[0008] The technical solution of the present invention is as follows:

[0009] The SAGD lifting and lowering operation temperature and pressure monitoring cable quick connection device includes a protective casing and a tightening component, and the tightening component includes:

[0010] A tightening joint, wherein one end of the tightening joint is a socket 1, and the other end is a socket 2, an inner side of the socket 2 is provided with an internal thread, and an inner side of the socket 2 close to an end of the socket 1 is provided with a conical surface 1;

[0011] A tightening nut, wherein the outer side of one end of the tightening nut is provided with an outer thread adapted to the inner thread, and the inner side of the end is provided with a second conical surface;

[0012] A bidirectional cone sleeve, both ends of the outer side of the bidirectional cone sleeve are provided with chamfers, and the degree of the chamfers is the same as the degree of the cone surface one and the cone surface two, so that the bidirectional cone sleeve is conveniently fitted with the tightening joint and the tightening nut, and the tightening nut is more convenient for squeezing the bidirectional cone sleeve.

[0013] Furthermore, there are two tightening components, and tightening components are provided at both ends of the protective sleeve.

[0014] Furthermore, the inner diameter of the protective sleeve is the same as the outer diameter of the tightening joint for inserting into the inner end of the protective sleeve, the inner diameter of the bidirectional cone sleeve is the same as the inner diameter of the protective sleeve, the temperature and pressure monitoring cable is 18 mm, the outer diameter of the inner protective tube is 10 mm, the inner diameter of the protective sleeve is 14 mm, and the outer diameter is 18 mm. The material of this device is made of high temperature resistant, high pressure resistant and corrosion resistant materials to ensure reliability and stability in extreme environments.

[0015] The SAGD lifting operation temperature and pressure monitoring cable quick connection method, the steps are as follows:

[0016] S1: Prepare the ends of the two temperature and pressure monitoring cables to be connected, leave enough cable length, and ensure that the ends are clean and free of burrs;

[0017] S2: The tightening joint, the bidirectional cone sleeve and the tightening nut are respectively put on the outer sides of the inner protective tubes at both ends of the temperature and pressure monitoring cable to be connected, and the bidirectional cone sleeve is inserted into the second socket of the tightening joint, and then the tightening nut is screwed into the inner side of the second socket of the tightening joint, and the bidirectional cone sleeve is squeezed by the tightening nut to fix the inner protective tube and the tightening joint together;

[0018] S3: Welding the inner protective tubes at both ends of the temperature and pressure monitoring cable to be connected to the tightening joints respectively;

[0019] S4: inserting the tightening connector installed at one end of the temperature and pressure monitoring cable from one end of the protective sleeve, and passing the wiring harness at this end out from the other end of the protective sleeve;

[0020] S5: Connecting the wire harness passing through the other end of the protective sleeve with the wire harness of the temperature and pressure monitoring cable at the other end, and then testing the connected wire harness. If the test fails, reconnect the failed wire harness;

[0021] When continuing the connection, you need to pay attention to the following: ensure that the positive and negative poles of each thermocouple bundle are correctly matched; and make a bidirectional hinged connection between the ends of the two thermocouple bundles to ensure that the connection is tight and has no gaps; use 400℃ high-temperature solder and welding equipment to weld the connection firmly to ensure the reliability and stability of the signal cable connection;

[0022] S6: After placing the connected wiring harness into the protective sleeve, insert the tightening connectors installed at both ends of the temperature and pressure monitoring cable into the two ends of the protective sleeve respectively to ensure the continuity and stability of signal transmission, and weld the tightening connector to the protective sleeve. Then use a detergent and a brush to thoroughly clean the connection between the protective sleeve and the tightening connector to ensure that there is no oil or impurities. Use special tools to tighten the tightening connector to ensure that the connection between the protective sleeve and the tightening connector is firm; use non-destructive testing technology to check the quality of the welding part to ensure that there are no defects in the welding part; and wind the connected temperature and pressure monitoring cable.

[0023] Furthermore, the wiring harness connection methods in S4 include welding and fusion. Welding is used for temperature measurement thermocouple wiring harness and pressure measurement signal cable, and fusion is used for optical fiber and photoelectric cable.

[0024] Furthermore, before welding is used to connect the wire harness, an insulating yellow wax tube must be installed on the outside of one of the ends of the connection. The insulating yellow wax tube can withstand a high temperature of 600°C. After the connection of the wire harness is completed and passed the inspection, the installed insulating yellow wax tube is moved to the welding position, and the welding position and the insulating tube are tightly wrapped with polyimide insulating tape to ensure the insulation and protection of the connection. The polyimide insulating tape can withstand a temperature of 400°C.

[0025] Furthermore, when the wire harness is connected by welding, it is done through a fiber splicing machine.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention inserts the inner protective tube into the tightening joint and the two-way cone sleeve in sequence, inserts it into the socket two on the protective sleeve, and uses the tightening nut to squeeze the two-way cone sleeve to deform the two-way cone sleeve, thereby fixing the inner protective tube and the protective sleeve together with the tightening joint at the same time, ensuring that the outer wall of the inner protective tube is firmly connected to the inner wall of the protective sleeve and the seal is reliable, thereby adapting to the outer diameter of the temperature and pressure monitoring cable and making it tightly connected, ensuring its smooth lowering and recovery in the well, and significantly shortening the connection time, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0029] Figure 2 is a cross-sectional view of the device of the present invention;

[0030] Figure 3 It is a structural diagram of a bidirectional cone sleeve of the device of the present invention;

[0031] Figure 4 It is a structural diagram of the tightening nut of the device of the present invention.

[0032] In the figure:

[0033] 1. Tightening assembly; 11. Tightening joint; 111. Socket one; 112. Socket two; 113. Cone one; 12. Bidirectional cone sleeve; 13. Tightening nut; 131. Cone two; 2. Protective sleeve. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] Embodiment 1, as Figure 1-4 As shown:

[0036] (1) Prepare the ends of the two sections of temperature and pressure monitoring cables to be connected, cut the inner protective tube with an outer diameter of 10 mm with a steel pipe cutter, and reserve the designed length of the wire harness and the inner protective tube; at the same time, ensure that the end of the inner protective tube is clean and free of burrs;

[0037] (2) Insert the inner protective tube with an outer diameter of 10 mm at one end of the 18 mm temperature and pressure monitoring cable into the interior of the socket 111 on the tightening joint 1, and put on the bidirectional cone sleeve 12 and the tightening nut 13 in the tightening assembly 1 in sequence. After the bidirectional cone sleeve 12 is inserted into the socket 2 112 of the tightening joint 11 with the same inner diameter as the socket 2 112, the tightening nut 13 is screwed into the inner side of the socket 2 112 of the tightening joint 11. The chamfers at both ends of the bidirectional cone sleeve 12 are squeezed by the cone 1 113 and the cone 2 131 to shrink inward and clamp the inner protective tube, thereby fixing the inner protective tube to the tightening joint 11. The outer diameter of the protective sleeve 2 is the same as that of the temperature and pressure monitoring cable, ensuring its smooth lowering and recovery in the well, significantly shortening the connection time, and improving production efficiency.

[0038] (3) Weld the inner protective tubes at both ends of the temperature and pressure monitoring cable to be connected to the tightening joint 11 respectively;

[0039] (4) Insert one end of the socket 2 112 on the parallel joint 11 installed at one end of the 18 mm temperature and pressure monitoring cable from one end of the protective sleeve 2, and pass the wire harness of this end out from the other end of the protective sleeve 2, and reserve some wire length for subsequent connection;

[0040] (5) Pass the thermocouple wire harness in the inner protective tube with an outer diameter of 10 mm at the other end of the 18 mm temperature and pressure monitoring cable through the protective sleeve 2 with an inner diameter of 14 mm and out from the other end;

[0041] (6) Connect the wire harness passing through the other end of the protective sleeve 2 with the wire harness of the temperature and pressure monitoring cable at the other end, and then test the connected wire harness. If the test fails, reconnect the failed wire harness;

[0042] (7) After the connected wire harness is placed in the protective sleeve 2, the tightening connectors 11 installed at both ends of the temperature and pressure monitoring cable are respectively inserted into the two ends of the protective sleeve 2, and the tightening connectors 11 and the protective sleeve 2 are welded together.

[0043] Embodiment 2:

[0044] Depending on the type of wiring harness that needs to be connected, different methods are required to connect the wiring harness:

[0045] (1) For the connection of the temperature measurement thermocouple harness and the pressure measurement signal cable, welding is adopted. The specific steps are as follows:

[0046] ①Corresponding pairing of positive and negative poles: Ensure that the positive and negative poles of each thermocouple harness are correctly matched;

[0047] ② Wear high temperature resistant insulating tube: Each thermocouple wire harness should be put into a 600℃ resistant insulating yellow wax tube in advance;

[0048] ③ Two-way hinged connection: Make two-way hinged connections at the ends of the two sections of thermocouple wire harnesses to ensure that the connection is tight and has no gaps;

[0049] ④ High temperature welding: Use 400℃ high temperature solder and welding equipment to firmly weld the connection to ensure the reliability and stability of the signal cable connection;

[0050] ⑤ Move the insulating tube: Move the pre-threaded 600℃ temperature-resistant yellow wax insulating tube to the welding position, ensuring that the insulating tube completely covers the welding point;

[0051] ⑥ Wrap with insulating tape: Use 400℃ heat-resistant polyimide insulating tape to tightly wrap the welding parts and insulating tube to ensure the insulation and protection of the connection.

[0052] (2) For optical fiber harnesses and optoelectronic cables, use a fiber splicing machine to fuse the ends of two optical fiber segments together.

[0053] Embodiment 3:

[0054] The inspection items of the wiring harness after the connection are as follows:

[0055] (1) For optical fiber and optoelectronic cables, it is necessary to detect whether the optical fiber signal meets the requirements.

[0056] (2) For the connection of the temperature measurement thermocouple harness and the pressure measurement signal cable, the following steps are required:

[0057] ① Measure the resistance value, insulation resistance value, measured temperature value of each group of thermocouples, or the resistance value and insulation value of the pressure signal cable to ensure they meet the requirements.

[0058] ② Use non-destructive testing technology (ultrasonic testing) to check the quality of the welding parts to ensure that there are no defects in the welding parts.

[0059] Through the above embodiments, the present invention provides a SAGD lifting and lowering operation temperature and pressure monitoring cable quick connection device and method with simple operation, short time consumption and high reliability, which is suitable for high-temperature downhole operations, improves production efficiency and safety, and reduces production costs.

[0060] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A SAGD lifting and lowering operation temperature and pressure monitoring cable quick connection device, comprising a protective sleeve (2) and a tightening assembly (1), characterized in that: The tightening assembly (1) comprises: A tightening joint (11), wherein one end of the tightening joint (11) is a socket 1 (111), and the other end is a socket 2 (112), an inner side of the socket 2 (112) is provided with an internal thread, and an inner side of the socket 2 (112) close to one end of the socket 1 (111) is provided with a conical surface 1 (113); A tightening nut (13), wherein the outer side of one end of the tightening nut (13) is provided with an outer thread matching the inner thread, and the inner side of the end is provided with a second conical surface (131); A bidirectional cone sleeve (12), wherein both ends of the outer side of the bidirectional cone sleeve (12) are provided with chamfers, and the degree of the chamfers is the same as the degree of the first cone surface (113) and the second cone surface (131).

2. The SAGD lifting and lowering operation temperature and pressure monitoring cable quick connection device as claimed in claim 1, characterized in that: There are two tightening components (1), and both ends of the protective sleeve (2) are provided with a tightening component (1).

3. The SAGD lifting and lowering operation temperature and pressure monitoring cable quick connection device as claimed in claim 1, characterized in that: The inner diameter of the protective sleeve (2) is the same as the outer diameter of the inner end of the tightening joint (11) for inserting into the protective sleeve (2).

4. A method for quickly connecting the temperature and pressure monitoring cable for SAGD lifting and lowering operations, characterized in that: The quick connection device according to claim 1 to claim 3 comprises the following steps: S1: Prepare the ends of the two sections of the temperature and pressure monitoring cables to be connected, reserve enough cable length, and ensure that the ends are clean and free of burrs; S2: The tightening joint (11), the bidirectional cone sleeve (12) and the tightening nut (13) are respectively and sequentially put on the outer sides of the inner protective tubes at the two ends of the temperature and pressure monitoring cable to be connected, and the bidirectional cone sleeve (12) is inserted into the second socket (112) of the tightening joint (11), and then the tightening nut (13) is screwed into the inner side of the second socket (112) of the tightening joint (11), and the bidirectional cone sleeve (12) is squeezed by the tightening nut (13) to fix the inner protective tube and the tightening joint (11) together; S3: welding the inner protective tubes at both ends of the temperature and pressure monitoring cable to be connected to the tightening joint (11) respectively; S4: inserting the tightening connector (11) installed at one end of the temperature and pressure monitoring cable into one end of the protective sleeve (2), and passing the wiring harness at this end out from the other end of the protective sleeve (2); S5: connecting the wire harness passing through the other end of the protective sleeve (2) with the wire harness of the temperature and pressure monitoring cable at the other end, and then testing the connected wire harness. If the test fails, reconnecting the failed wire harness; S6: After placing the connected wire harness into the protective sleeve (2), the tightening connectors (11) installed at both ends of the temperature and pressure monitoring cable are respectively inserted into the two ends of the protective sleeve (2), and the tightening connectors (11) and the protective sleeve (2) are welded together.

5. The method for quickly connecting the temperature and pressure monitoring cable for SAGD lifting and lowering operation as claimed in claim 4 is characterized by: The wiring harness connection methods in S4 include welding and fusion. Welding is used for temperature measurement thermocouple wiring harness and pressure measurement signal cable, and fusion is used for optical fiber and photoelectric cable.

6. The method for quickly connecting the temperature and pressure monitoring cable for SAGD lifting and lowering operation as claimed in claim 5, characterized in that: Before using welding to connect the wire harness, an insulating yellow wax tube must be installed on the outside of one of the ends of the connection. After the connection of the wire harness is completed and passed the inspection, the installed insulating yellow wax tube is moved to the welding position, and the welding position and the insulating tube are tightly wrapped with polyimide insulating tape.

7. The method for quickly connecting the temperature and pressure monitoring cable for SAGD lifting and lowering operation as claimed in claim 6, characterized in that: When the wire harness is connected by welding, it is done through a fiber splicing machine.

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