Reservoir electric heating cable connecting device

Abstract

The invention discloses a reservoir electric heating cable connecting device which comprises a one-to-three device and a one-to-one device. The one-to-three device comprises an upper three-hole cable penetrating part, a lower three-hole cable penetrating part, a cable sealing ring and a protection ring which are connected in sequence, and a three-core same-armored steel pipe cable penetrates into the one-to-three device from one side of the protection ring; an internal conductor of the cable is connected with a conductor of an independent outer armored steel pipe cable which penetrates into the one-to-three device from the upper side of the three-hole cable in the cable sealing ring; the one-to-one device comprises an upper joint, a shell and a lower joint which are connected in sequence, the independent externally-armored steel pipe cable penetrates into the one-to-one device from one side of the upper joint, and a conductor of the independent externally-armored steel pipe cable is connected with a conductor of the single-core rubber cable penetrating into the one-to-one device from one side of the lower joint in the shell. The cable connector is used for cable connection of the offshore oilfield electric heating technology, normal power-on operation of the electric heating technology in an oil well is achieved, and it is guaranteed that the electrical property of the cable is good.

Description

Technical Field

[0001] The invention relates to the technical field of cable connection, and in particular to a reservoir electric heating cable connection device. Background Art

[0002] Heavy oil fields have huge resource potential and account for a large proportion of the world's oil and gas resources. Using various heavy oil thermal recovery technologies to maximize the recovery of heavy oil and high-viscosity oil is an important issue in the petroleum industry. Heavy oil is characterized by high content of colloid and asphaltene, resulting in high viscosity, but its viscosity is extremely sensitive to temperature. Rising temperature will greatly reduce the viscosity of heavy oil.

[0003] Heavy oil electric heating technology is suitable for oil fields with poor steam throughput effects, and is one of the key technologies currently developed for heavy oil thermal recovery. At present, the most widely used electric heating methods at home and abroad include: THOR electric heating technology, which is affected by the motor itself, and the heating temperature is limited, with the maximum temperature being only 120°C; microwave heating technology, which has a low working voltage and limited heating power. At the same time, due to the large size of the equipment, it cannot be applied on-site; electromagnetic heating technology, which has extremely high requirements for power supply stability and cannot be applied in on-site environments. Resistance heating technology, which has strong versatility and can be applied in a variety of occasions. Considering the temperature resistance, steel pipe cables are usually used, but currently steel pipe cables and rubber cables cannot be effectively connected. Summary of the invention

[0004] In order to solve the problem in the prior art that a steel pipe cable and a rubber cable cannot be effectively connected in a high temperature environment, the present invention provides a reservoir electric heating cable connection device.

[0005] The present invention is achieved by adopting the following technical solutions.

[0006] A reservoir electric heating cable connection device, including a one-to-three device and a one-to-one device;

[0007] The one-to-three device comprises a three-hole cable crossing upper, a three-hole cable crossing lower, a cable sealing ring and a protective ring connected in sequence, a three-core same-armored steel tube cable passes through the one-to-three device from one side of the protective ring, and its internal conductor is connected in the cable sealing ring with the conductor of the independent outer armored steel tube cable that passes through the one-to-three device from one side of the three-hole cable crossing upper;

[0008] The one-to-one device includes an upper joint, an outer shell and a lower joint connected in sequence. The independent outer armored steel tube cable passes through the one-to-one device from one side of the upper joint, and its conductor is connected with the conductor of the single-core rubber cable passing through the one-to-one device from one side of the lower joint in the outer shell.

[0009] Furthermore, the cable sealing ring is welded to the three-core same-armored steel tube cable.

[0010] Furthermore, the protective ring is arranged outside the cable sealing ring, and the protective ring is welded to the three-core same-armored steel tube cable and the cable sealing ring.

[0011] Furthermore, the independent outer armored steel tube cable is sealed and fixed to the three-hole cable crossing upper and lower by means of a hollow pressure cap, a gasket and an O-ring.

[0012] Furthermore, high temperature insulating glue is injected into the cable sealing ring.

[0013] Furthermore, the upper joint is welded to the independent outer armored steel tube cable and the outer casing.

[0014] Furthermore, the single-core rubber cable and the lower connector are sealed and fixed by means of a second gasket, a second O-ring and a pressure cap.

[0015] Furthermore, high temperature insulating glue is injected into the shell.

[0016] This application has the following beneficial effects.

[0017] The invention can realize efficient connection between steel pipe cable and rubber cable, and can work normally in the bottom hole environment, promote the application of electric heating technology in oil field production, and lay a technical foundation for large-scale thermal recovery and development of heavy oil fields. The invention has simple structure, good use effect and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the one-to-three device of the present invention;

[0019] Figure 2 It is a structural schematic diagram of a one-to-one device of the present invention.

[0020] Among them, A-1, hollow pressure cap; A-2, gasket one; A-3, O-ring one; A-4, three-hole cable crossing upper; A-5, three-hole cable crossing lower; A-6, cable sealing ring; A-7, protective ring; A-8. three-core armored steel tube cable; A-9. independent outer armored steel tube cable;

[0021] B-1, upper connector; B-2, outer shell; B-3, lower connector; B-4, second gasket; B-5, second O-ring; B-6, pressure cap; B-7. Single-core rubber cable. DETAILED DESCRIPTION

[0022] The present patent application is further described below in conjunction with embodiments.

[0023] like Figure 1-2As shown, a reservoir electric heating cable connection device includes a one-to-three device and a one-to-one device. The one-to-three device is used to convert a steel tube cable with three conductors and the same outer armor (three-core same-armor steel tube cable A-8) into a single-conductor steel tube cable with independent outer armor (independent outer armor steel tube cable A-9), and the one-to-one device is used to connect the independent outer armor steel tube cable A-9 with the single-core rubber cable B-7.

[0024] Specifically, the one-to-three device includes a hollow pressure cap A-1, a gasket ring A-2, an O-ring A-3, a three-hole cable crossing upper A-4, a three-hole cable crossing lower A-5, a cable sealing ring A-6 and a protective ring A-7. The three-hole cable crossing upper A-4, the three-hole cable crossing lower A-5, the cable sealing ring A-6 and the protective ring A-7 are connected in sequence, and the three-core armored steel tube cable A-8 penetrates the one-to-three device from one side of the protective ring A-7, and the independent outer armored steel tube cable A-9 penetrates the one-to-three device from one side of the three-hole cable crossing upper A-4.

[0025] More specifically, the cable sealing ring A-6 is welded to the three-core armored steel tube cable A-8 for sealing and fixing, and the protective ring A-7 is arranged outside the cable sealing ring A-6 and welded to the three-core armored steel tube cable A-8 and the cable sealing ring A-6. The internal conductor of the three-core armored steel tube cable A-8 is connected to the conductor of the independent outer armored steel tube cable A-9, placed in the cable sealing ring A-6, and high-temperature insulating glue is injected into the cable sealing ring A-6 through the glue injection hole. The independent outer armored steel tube cable A-9 passes through the three-hole cable crossing lower A-5 and the three-hole cable crossing upper A-4, and is locked by the gasket ring A-2, the O-ring A-3, and the hollow pressure cap A-1, and the O-ring A-3 is squeezed to fix and seal.

[0026] Specifically, the one-to-one device includes an upper joint B-1, an outer shell B-2, a lower joint B-3, a second gasket B-4, a second O-ring B-5, and a pressure cap B-6. The upper joint B-1, the outer shell B-2, and the lower joint B-3 are connected in sequence, and the independent outer armored steel tube cable A-9 is inserted into the one-to-one device from one side of the upper joint B-1, and the single-core rubber cable B-7 is inserted into the one-to-one device from one side of the lower joint B-3.

[0027] More specifically, the upper connector B-1 is welded with the independent outer armored steel tube cable A-9 and the outer shell B-2 for sealing and fixing, the conductor of the single-core rubber cable B-7 is connected with the conductor of the independent outer armored steel tube cable A-9, placed in the outer shell B-2, and high-temperature insulating glue is injected into the outer shell B-2 through the glue injection hole. The single-core rubber cable B-7 passes through the lower connector B-3, and is locked by the gasket B-4, the O-ring B-5, and the pressure cap B-6, and the O-ring B-5 is squeezed to fix and seal.

[0028] The method of use of the present invention is as follows:

[0029] The outer armor of the three-core same-armor steel tube cable A-8 is stripped to expose three conductors, and the three independent outer-armored steel tube cables A-9 are passed through a one-to-three device to realize the conversion of the steel tube cable structure with three conductors in the same outer armor into a steel tube cable structure with a single conductor and independent outer armor, and then the independent outer-armored steel tube cable A-9 is connected with the single-core rubber cable B-7 through a one-to-one device. The present invention is used for cable connection of offshore oil field electric heating technology, realizes the normal power-on operation of electric heating technology in oil wells, and ensures good electrical performance of the cable.

[0030] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reservoir electric heating cable connection device, characterized in that: Includes one-to-three devices and one-to-one devices; The one-to-three device comprises a three-hole cable crossing upper (A-4), a three-hole cable crossing lower (A-5), a cable sealing ring (A-6) and a protective ring (A-7) connected in sequence, a three-core armored steel tube cable (A-8) passes through the one-to-three device from one side of the protective ring (A-7), and its internal conductor is connected in the cable sealing ring (A-6) with the conductor of an independent outer armored steel tube cable (A-9) passing through the one-to-three device from one side of the three-hole cable crossing upper (A-4); The one-to-one device comprises an upper joint (B-1), an outer shell (B-2) and a lower joint (B-3) connected in sequence, an independent outer armored steel tube cable (A-9) passes through the one-to-one device from one side of the upper joint (B-1), and its conductor is connected in the outer shell (B-2) with the conductor of a single-core rubber cable (B-7) passing through the one-to-one device from one side of the lower joint (B-3).

2. A reservoir electric heating cable connection device according to claim 1, characterized in that: The cable sealing ring (A-6) is welded to the three-core armored steel tube cable (A-8).

3. A reservoir electric heating cable connection device according to claim 1, characterized in that: The protective ring (A-7) is arranged outside the cable sealing ring (A-6), and the protective ring (A-7) is welded to the three-core same-armored steel tube cable (A-8) and the cable sealing ring (A-6).

4. A reservoir electric heating cable connection device according to claim 1, characterized in that: The independent outer armored steel tube cable (A-9) is sealed and fixed to the three-hole cable crossing upper (A-4) and the three-hole cable crossing lower (A-5) through a hollow pressure cap (A-1), a gasket ring (A-2) and an O-ring (A-3).

5. A reservoir electric heating cable connection device according to claim 1, characterized in that: High temperature insulating glue is injected into the cable sealing ring (A-6).

6. A reservoir electric heating cable connection device according to claim 1, characterized in that: The upper joint (B-1) is welded to the independent outer armored steel tube cable (A-9) and the outer shell (B-2).

7. A reservoir electric heating cable connection device according to claim 1, characterized in that: The single-core rubber cable (B-7) and the lower connector (B-3) are sealed and fixed via a second gasket ring (B-4), a second O-ring (B-5) and a pressure cap (B-6).

8. A reservoir electric heating cable connection device according to claim 1, characterized in that: High temperature insulating glue is injected into the shell (B-2).

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