CN108172329A - Oil well detection cable and its manufacturing method - Google Patents

Abstract

The present invention provides an oil well detection cable, comprising: at least one optical unit, at least one electrical unit, at least one hydraulic pipe unit, and an outer covering the optical unit, the electrical unit, and the hydraulic pipe unit. The protective layer, the shape of the outer protective layer is rectangular or flat, and the optical unit, the electrical unit, and the hydraulic pipe unit are roughly arranged in a straight line along the length direction of the outer protective layer. The oil well detection cable of the present invention includes a hydraulic pipe unit, which can be used to inject high-temperature and high-pressure steam in the oil well, increase the temperature and pressure of the downhole heavy oil, increase the fluidity of the heavy oil, and solve the problems of difficult penetration of detection equipment and difficult laying of oil well cables. The shape of the oil well detection cable is rectangular or flat, which makes the oil well detection cable have excellent mechanical properties such as tensile resistance, lateral pressure resistance, and torsion resistance.

Description

Oil well detection cable and its manufacturing method

technical field

The invention relates to the technical field of photoelectric composite cables, in particular to a detection cable used in an oil well and a manufacturing method thereof.

Background technique

In oil well surveying, detectors need to use oil well detection cables for data transmission. Existing oil well detection cables are generally photoelectric composite cables, which have the performance of anti-electromagnetic interference and atomic radiation, the mechanical properties of thin diameter, soft quality and light weight, and the chemical properties of water resistance, high temperature resistance and corrosion resistance. The optical fiber sensing system of the detector utilizes the excellent performance of optical fiber transmission to overcome the harsh downhole environment and measure the environmental parameters of the wellbore and wellsite with high precision.

In the process of oil production, when the downhole is heavy oil with high viscosity and poor fluidity, the current common production method is to inject high-temperature and high-pressure steam into the oil well through a separate hydraulic pipeline to increase the temperature and pressure of the downhole heavy oil and increase its flow. to achieve the purpose of oil displacement. At the same time, when the downhole oil is viscous, it will also hinder the vertical laying of the detection equipment in the oil layer, so that the detection equipment and detection cables cannot go deep into the target detection areas such as the middle layer and bottom layer of the oil well for measurement.

The existing oil well detection cables have a single function and mostly have a circular structure. When laying in the oil well and performing oil layer deep detection work, it is easy to rotate and twist and cannot move forward. The torsion produced by the oil well detection cable during work will reduce the stability of signal transmission and even cause transmission interruption.

Contents of the invention

Based on this, it is necessary to provide a multi-functional and torsion-resistant oil well detection cable and a manufacturing method thereof to address the above problems.

In order to solve the above technical problems, a technical solution provided by the present invention is to provide an oil well detection cable, including: at least one optical unit, at least one electrical unit, at least one hydraulic pipe unit and the optical unit, the electrical unit . The hydraulic pipe unit is covered with an outer sheath, the outer sheath is rectangular or flat in shape, and the optical unit, the electrical unit, and the hydraulic pipe unit are roughly in a straight line along the length direction of the outer sheath arrangement.

Wherein, the optical unit includes a plurality of optical fibers located in the innermost layer, a plurality of fiber paste coated on the optical fiber, a first stainless steel tube coated on the outside of the optical fiber and the fiber paste, and a first stainless steel tube coated on the outside of the first stainless steel tube. The second stainless steel pipe.

Wherein, there is a space between the first stainless steel pipe and the second stainless steel pipe, and the space is filled with sealant or ointment.

Wherein, the electrical unit includes a copper conductor located in the innermost layer, an insulating layer covering the outer side of the copper conductor, a filling layer covering the outer side of the insulating layer, and a stainless steel pipe covering the outer side of the filling layer.

Among them, the hydraulic pipe unit is a circular hydraulic pipe formed by laser welding of a high corrosion-resistant nickel-based alloy steel strip.

Wherein, the outer sheath is formed by extruding thermoplastic elastomer dynamic vulcanized rubber.

The present invention also provides an oil well detection cable, comprising: at least one light unit, at least one hydraulic pipe unit, and an outer sheath covering the light unit and the hydraulic pipe unit, the shape of the outer sheath is rectangular or Flat shape, the light unit and the hydraulic pipe unit are roughly arranged in a straight line along the length direction of the outer sheath.

The present invention further provides an oil well detection cable, comprising: at least one electric unit, at least one hydraulic pipe unit, and an outer sheath covering the electric unit and the hydraulic pipe unit, the outer sheath is rectangular or Flat shape, the electric unit and the hydraulic pipe unit are arranged in a straight line along the length direction of the outer sheath.

In addition, the present invention also provides a method for manufacturing an oil well detection cable, comprising the following steps:

In the optical unit step, laser welding technology is used to cover and weld several optical fibers and several fiber pastes with stainless steel strips to prepare a seamless first stainless steel tube, and the first stainless steel tube and the resistance The water-filled glue is clad and welded into the second stainless steel tube to form the light unit;

In the hydraulic pipe unit step, in the welded pipe production line, the corrosion-resistant nickel-based alloy steel strip is used to make seamless circular hydraulic pipes by laser welding technology.

In the outer sheath step, the optical unit and at least one hydraulic pipe unit are covered with materials by extrusion process to form a flat oil well detection cable finished product.

Among them, before the step of the outer sheath, an electric unit step is also included, and the extrusion process is used to extrude a high-temperature fluoroplastic insulating layer outside the nickel-plated copper conductor to form an insulated wire, and extrude a nylon material outside the insulated wire as a filling layer. The insulated wire containing the filling layer and the water-blocking filling glue are wrapped in the seamless stainless steel tube by laser welding technology to form an electric unit, and the electric unit is wrapped in the outer sheath.

The beneficial effects of the present invention are: different from the situation of the prior art, the oil well detection cable of the present invention includes a hydraulic pipe unit, which can be used to inject high-temperature and high-pressure steam in the oil well, increase the temperature and pressure of the heavy oil downhole, and increase the fluidity of the heavy oil. It can well solve the problems of difficult penetration of detection equipment and difficult laying of oil well cables. At the same time, the shape of the oil well detection cable is rectangular or flat, so that the oil well detection cable has excellent mechanical properties such as tensile resistance, lateral pressure resistance, and torsion resistance. And it can stably transmit photoelectric signals in the long-term high-temperature and high-pressure oil well environment, which solves the problems of single function and difficult laying of existing products, and the product has simple structure, stable function and strong adaptability.

Description of drawings

Fig. 1 is a cross-sectional view of the first embodiment of the oil well detection cable of the present invention, the oil well detection cable includes an optical unit and an electrical unit;

Fig. 2 is a cross-sectional view of the optical unit of the oil well detection cable in Fig. 1;

Fig. 3 is a cross-sectional view of the electric unit of the oil well detection cable in Fig. 1;

Fig. 4 is a cross-sectional view of the second embodiment of the oil well detection cable of the present invention;

Fig. 5 is a cross-sectional view of the third embodiment of the oil well detection cable of the present invention;

Fig. 6 is a cross-sectional view of the fourth embodiment of the oil well detection cable of the present invention;

Fig. 7 is a cross-sectional view of the fifth embodiment of the oil well detection cable of the present invention;

Fig. 8 is a cross-sectional view of the sixth embodiment of the oil well detection cable of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions of each exemplary embodiment provided by the present invention with reference to the accompanying drawings in the embodiments of the present invention. In the case of no conflict, the following embodiments and technical features thereof can be combined with each other. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Please refer to FIG. 1 , which is a sectional view of the first embodiment of the oil well detection cable of the present invention. The oil well detection cable 100 includes an optical unit 10 , an electrical unit 20 , a hydraulic pipe unit 30 and the optical unit 10 arranged at intervals. , the electrical unit 20 and the hydraulic pipe unit 30 are covered by an inner outer sheath 40 . The shape of the outer sheath 40 is rectangular or flat, and the optical unit 10, electrical unit 20, and hydraulic pipe unit 30 are arranged in a straight line along the length direction of the outer sheath 40, so that the oil well detection cable has excellent tensile strength. , Anti-lateral pressure, anti-torsion and other mechanical properties.

Please refer to Fig. 2, the optical unit 10 is used to transmit optical signals, including a plurality of optical fibers 11 located in the innermost layer, a plurality of fiber paste 13 coated on these optical fibers 11, and a fiber paste 13 coated on the outside of the optical fiber 11 and fiber paste 13. The first stainless steel tube 15 and the second stainless steel tube 17 covering the outside of the first stainless steel tube 15 . In this embodiment, there is a gap 19 between the first stainless steel pipe 15 and the second stainless steel pipe 17. In other embodiments, the gap 19 can be filled with water-blocking glue or oil to achieve water-blocking and sealing. Effect.

Please refer to FIG. 3 , the electrical unit 20 is used to transmit electrical signals, including a copper conductor 21 located in the innermost layer, an insulating layer 23 covering the outside of the copper conductor 21 , and a filling layer 25 covering the outside of the insulating layer 23 And the stainless steel pipe 27 coated on the outside of the filling layer 25 . In this embodiment, there is a gap 29 between the filling layer 25 and the stainless steel pipe 27 , in other embodiments, it can also be filled with sealant or oil to achieve the effect of water blocking and sealing. The copper conductor 21 is silver-plated copper wire, tin-plated copper wire or nickel-plated copper wire. In this embodiment, the insulating layer 23 is an insulated wire made of fluorinated ethylene propylene copolymer (ie FEP, Fluorinated ethylene propylene) or rubber. The filling layer 25 is made of nylon, and there is a sealant on the outside of the filling layer 25, and is protected by a stainless steel tube 27, so that the oil well detection cable can withstand high temperature, oil, and vertical high-pressure water seepage.

The hydraulic pipe unit 30 is a seamless circular hydraulic pipe made of high corrosion-resistant nickel-based alloy (commonly known as Incoloy 825 alloy) steel strip and laser welding technology, which can be used to inject high-temperature and high-pressure steam at 300°C and 207MPa. Under the oil well, especially in the heavy oil environment, using the hydraulic pipe unit to inject high-temperature and high-pressure steam into the oil well can increase the temperature and pressure of the downhole heavy oil and increase the fluidity of the heavy oil, which can solve the problem of deep penetration of detection equipment and oil well cables. Problems such as difficulty in laying.

In this embodiment, the outer sheath 40 is formed by extruding thermoplastic elastomer dynamic vulcanizate (TPV) with heat resistance and low compression deformation, so that the oil well detection cable can withstand temperature, abrasion, aging, oil, Corrosion resistance, maximum pressure resistance 70MPa, long-term use temperature up to 150 ℃, suitable for oil well detection environment. In other embodiments, the outer sheath 40 may also be formed by extruding high-temperature-resistant insulating materials such as elastomers or nylon, such as polyvinylidene fluoride (PVDF).

4 is a cross-sectional view of the second embodiment of the present invention. The oil well detection cable 100a includes an optical unit 10a, a hydraulic pipe unit 30a, and two electrical units 20a located outside the optical unit 10a and the hydraulic pipe unit 30a respectively. And the outer sheath 40a covering the optical unit 10a, the hydraulic pipe unit 30a, and the two electrical units 20a. The shape of the outer sheath 40a is rectangular or flat, wherein the electrical unit 20a, the optical unit 10a, the hydraulic pipe unit 30a, and the electrical unit 20a are arranged in a straight line along the length direction of the outer sheath 40a, so that the oil well detection cable has Excellent tensile, lateral pressure, torsion and other mechanical properties.

The difference from the first embodiment is that in this embodiment, the electric unit 20a is a silver-plated copper strand, which is formed by twisting seven silver-plated copper wires, and supplies power to the oil well detection cable 100a and enhances mechanical properties.

Fig. 5 is a cross-sectional view of the third embodiment of the present invention. The oil well detection cable 100b includes an optical unit 10b, an electrical unit 20b, and two hydraulic pipe units 30b located between the optical unit 10b and the electrical unit 20b. And the outer sheath 40b covering the optical unit 10b, the two hydraulic pipe units 30b, and the electric unit 2b. The shape of the outer sheath 40b is rectangular or flat, wherein the optical unit 10b, two hydraulic pipe units 30b, and the electrical unit 20b are arranged in a straight line along the length direction of the outer sheath 40b, so that the oil well detection cable has excellent resistance. Tensile, lateral compression, torsion and other mechanical properties.

The difference from the first embodiment is that in this embodiment, the number of hydraulic pipe units 30b is two, and in other embodiments, the number of hydraulic pipe units can be adjusted according to the density of downhole heavy oil.

Fig. 6 is a cross-sectional view of the fourth embodiment of the present invention, the oil well detection cable 100c includes a hydraulic pipe unit 30c arranged at intervals, two electric units 20c located on both sides of the hydraulic pipe unit 30c, and the hydraulic pipe unit 30c, the The two electrical units 20c are covered by the inner outer sheath 40c. The shape of the outer sheath 40c is rectangular or flat, wherein the electric unit 20c, the hydraulic pipe unit 30c, and the electric unit 20c are arranged in a straight line along the length direction of the outer sheath 40c, so that the oil well detection cable has excellent tensile strength. , Anti-lateral pressure, anti-torsion and other mechanical properties.

The difference from the first embodiment is that in this embodiment, the electric unit 20c is a silver-plated copper strand, which is formed by twisting seven silver-plated copper wires, and supplies power to the oil well detection cable 100c and enhances mechanical properties.

7 is a cross-sectional view of the fifth embodiment of the present invention. The oil well detection cable 100d includes an optical unit 10d, a hydraulic pipe unit 30d arranged at intervals, and an outer shell covering the optical unit 10d and the hydraulic pipe unit 30d. Sheath 40d. The shape of the outer sheath 40d is rectangular or flat, wherein the optical unit 10d and the hydraulic pipe unit 30d are arranged in a straight line along the length direction of the outer sheath 40d, so that the oil well detection cable has excellent tensile and lateral pressure resistance. , Torsion resistance and other mechanical properties.

8 is a cross-sectional view of the sixth embodiment of the present invention. The oil well detection cable 100e includes an electric unit 20e, a hydraulic pipe unit 30e arranged at intervals, and an outer shell covering the electric unit 20e and the hydraulic pipe unit 30e. Sheath 40e. The shape of the outer sheath 40e is rectangular or flat, wherein the electric unit 20e and the hydraulic pipe unit 30e are arranged in a straight line along the length direction of the outer sheath 40e, so that the oil well detection cable has excellent tensile and lateral pressure resistance. , Torsion resistance and other mechanical properties.

The present invention also provides a method for preparing an oil well detection cable, the steps of the first embodiment are as follows:

In the optical unit step, laser welding technology is used in the welded pipe production line, and multiple high-temperature-resistant optical fibers and high-low temperature-resistant and high-pressure-resistant fiber paste are clad and welded with stainless steel strips to prepare the first seamless stainless steel pipe, which is then welded by laser Technology The Incoloy 825 alloy steel strip is used to cover and weld the first stainless steel tube and water-blocking filling glue to prepare the second stainless steel tube to form a circular light unit.

In the electrical unit step, the extrusion process is adopted in the high-temperature insulation production line, and a high-temperature fluoroplastic FEP insulation layer is extruded outside the nickel-plated copper conductor to form an insulated wire, and then nylon material is extruded outside the insulation layer as a filling layer, and laser welding technology is used to weld the The insulated wires of the filling layer and the water-blocking filling glue are wrapped in the seamless stainless steel tube to form a circular electrical unit;

In the hydraulic pipe unit step, in the welded pipe production line, the steel strip made of Incoloy 825 alloy is made into a seamless circular hydraulic pipe by laser welding technology.

In the outer sheath step, the high-temperature sheath wire is covered by extrusion technology with high-temperature-resistant TPV or PVDF materials to cover the optical unit, at least one electrical unit, and at least one hydraulic pipe unit to form a flat oil well detection cable product.

The present invention also provides a second embodiment of a method for preparing an oil well detection cable, the steps of which are as follows:

In the optical unit step, laser welding technology is used in the welded pipe production line, and multiple high-temperature-resistant optical fibers and high-low temperature-resistant and high-pressure-resistant fiber paste are clad and welded with stainless steel strips to prepare the first seamless stainless steel pipe, which is then welded by laser Technology The Incoloy 825 alloy steel strip is used to cover and weld the first stainless steel tube and water-blocking filling glue to prepare the second stainless steel tube to form a circular light unit.

In the hydraulic pipe unit step, in the welded pipe production line, the steel strip made of Incoloy 825 alloy is made into a seamless circular hydraulic pipe by laser welding technology.

In the outer sheath step, the high-temperature sheath line is covered by an extrusion process with high-temperature-resistant TPV or PVDF materials to cover the light unit and at least one hydraulic pipe unit to form a flat oil well detection cable product.

The oil well detection cable of the present invention includes a hydraulic pipe unit, which can be used to inject high-temperature and high-pressure steam into the oil well to increase the temperature and pressure of the downhole heavy oil and increase the fluidity of the heavy oil. At the same time, the oil well detection cable is rectangular or flat in shape, making the oil well The detection cable has excellent mechanical properties such as tensile resistance, lateral pressure resistance, and torsion resistance.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (10)

1. An oil well detection cable, characterized in that it comprises: at least one optical unit, at least one electrical unit, at least one hydraulic pipe unit, and the optical unit, the electrical unit, and the hydraulic pipe unit are covered inside The outer sheath is rectangular or flat in shape, and the optical unit, the electrical unit, and the hydraulic pipe unit are roughly arranged in a straight line along the length direction of the outer sheath. 2. The oil well detection cable according to claim 1, wherein the optical unit comprises a plurality of optical fibers located in the innermost layer, a plurality of fiber pastes coated on the optical fibers, coated on the optical fibers and the optical fibers The first stainless steel tube on the outside of the fiber paste, and the second stainless steel tube on the outside of the first stainless steel tube. 3. The oil well detection cable according to claim 2, wherein there is a space between the first stainless steel pipe and the second stainless steel pipe, and the space is filled with sealant or ointment. 4. The oil well detection cable according to claim 1, wherein the electric unit comprises a copper conductor located in the innermost layer, an insulating layer covering the outside of the copper conductor, and an insulating layer covering the outside of the insulating layer. The filling layer and the stainless steel pipe covering the outside of the filling layer. 5. The oil well detection cable according to claim 1, wherein the hydraulic pipe unit is a circular hydraulic pipe formed by welding corrosion-resistant nickel-based alloy steel strips. 6. The oil well detection cable according to claim 1, wherein the outer sheath is formed by extruding thermoplastic elastomer dynamic vulcanized rubber. 7. An oil well detection cable, characterized in that it comprises: at least one optical unit, at least one hydraulic pipe unit, and an outer sheath covering the optical unit and the hydraulic pipe unit, the outer sheath The outer shape is rectangular or flat, and the light unit and the hydraulic pipe unit are roughly arranged in a straight line along the length direction of the outer sheath. 8. An oil well detection cable, characterized in that it comprises: at least one electric unit, at least one hydraulic pipe unit, and an outer sheath covering the electric unit and the hydraulic pipe unit, the outer sheath The outer shape is rectangular or flat, and the electric unit and the hydraulic pipe unit are arranged in a straight line along the length direction of the outer sheath. 9. A method for manufacturing an oil well detection cable, comprising the following steps: In the optical unit step, laser welding technology is used to clad and weld several optical fibers and several fiber pastes with stainless steel strips to prepare a seamless first stainless steel tube, and the first stainless steel tube and the first stainless steel tube are welded with a corrosion-resistant nickel-based alloy steel strip. The water-blocking filling glue is clad and welded into the second stainless steel tube to form the light unit; In the hydraulic pipe unit step, in the welded pipe production line, the corrosion-resistant nickel-based alloy steel strip is used to make seamless circular hydraulic pipes by laser welding technology. In the step of the outer sheath, the optical unit and at least one hydraulic pipe unit are coated with materials by an extrusion process to form a finished oil well detection cable in a flat shape. 10. The manufacturing method of the oil well detection cable according to claim 9, characterized in that, before the outer sheath step, it also includes an electric unit step, using an extrusion process to extrude high-temperature fluoroplastics outside the nickel-plated copper conductor The insulating layer forms an insulated wire, and a nylon material is extruded outside the insulated wire as a filling layer, and the insulated wire containing the filling layer and the water-blocking filling glue are wrapped in a seamless stainless steel tube by laser welding technology to form an electric wire. A unit, the electrical unit is wrapped in the outer sheath.