Medicament-injected submersible cable

Abstract

The invention relates to the technical field of oil field oil extraction lifting, in particular to a medicament injection submersible cable, and aims to reduce the collision resistance failure risk during construction of the submersible cable and solve the problems that a medicament injection pipe is difficult to enter a well, the pipe wall is easy to bend, collide and damage and the like. The invention provides a medicament injection oil-submersible cable. The medicament injection oil-submersible cable comprises a cable core, a stainless steel medicament injection pipe and an outer armor layer, wherein the cable core comprises a bare copper conductor, an auxiliary insulating layer, a main insulating layer and an inner sheath; the bare copper conductor, the auxiliary insulating layer, the main insulating layer and the inner sheath are sequentially connected from inside to outside, the auxiliary insulating layer is wrapped outside the bare copper conductor, the main insulating layer is wrapped outside the auxiliary insulating layer, and the inner sheath is wrapped outside the main insulating layer; the stainless steel agent injection pipe is arranged on the side of the cable, the number of the cable core is at least one, and the stainless steel agent injection pipe is used for circulating chemical agents; and the outer armor layer is wrapped outside the cable core and the stainless steel medicament injection pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of oil production lifting in oil fields, and particularly to an injection chemical agent submersible cable. Background Art

[0002] In recent years, with the increasing difficulty in the exploitation of oil wells such as shale oil and high pour point oil, the problems of scaling and wax deposition in oil wells and formations have become increasingly prominent, seriously affecting the normal production of crude oil. The problems of scaling and wax deposition can cause blockage and corrosion of production manifolds or oil production devices, reduce the oil well output and the service life of equipment, increase the oil production cost, and restrict cost reduction and efficiency increase.

[0003] To solve the problems of scaling and viscosity reduction of produced fluid, one effective method is to regularly inject chemical agents into oil wells, which can not only remove the generated well scale, but also play the role of viscosity reduction and wax precipitation separation for the produced fluid, providing technical guarantee for the rodless pump lifting and exploitation of well fluid.

[0004] At present, there are two technologies on the market. One is to directly inject chemical agents into the wellhead Christmas tree, and the agents naturally settle to the wax deposition place in the wellbore. This technology is affected by the gas content in the oil well. When the gas content is relatively large, the agents generally can only reach the foamy liquid level with a lower temperature in the oil well. According to actual application cases, the effects of viscosity reduction and wax removal are not ideal. The other is to combine the conventional submersible cable core with a single-core injection chemical agent pipe, and use a single-pipe single-armored injection chemical agent submersible cable with a single-layer steel tape armor structure. Since the width of the cable increases, the risk of being damaged by collision during construction becomes larger, and there are also certain limitations on the injection volume of a single well and the types of chemical agents used. Summary of the Invention

[0005] The purpose of the present invention is to provide an injection chemical agent submersible cable, which can effectively reduce the risk of failure due to being resistant to collision during the construction of the submersible cable; solve the problems such as difficult operation of the injection chemical agent pipe entering the well, easy bending of the pipe wall, and damage by collision.

[0006] To solve the above technical problems, the technical solution provided by the present invention is as follows:

[0007] The present invention provides an injection chemical agent submersible cable, including: a cable core, a stainless steel injection chemical agent pipe, and an outer armor layer; wherein, the cable core includes a bare copper conductor, an auxiliary insulation layer, a main insulation layer, and an inner sheath;

[0008] The bare copper conductor, the auxiliary insulation layer, the main insulation layer, and the inner sheath are sequentially connected from inside to outside. The auxiliary insulation layer is wrapped around the outside of the bare copper conductor, the main insulation layer is wrapped around the outside of the auxiliary insulation layer, and the inner sheath is wrapped around the outside of the main insulation layer;

[0009] The stainless steel chemical agent injection pipe is arranged on the side of the cable. There is at least one cable core, and there is at least one stainless steel chemical agent injection pipe, which is used for circulating chemical agents.

[0010] The outer armor layer wraps around the outside of the cable core and the stainless steel chemical agent injection pipe.

[0011] Furthermore,

[0012] The auxiliary insulation layer is a polyimide-fluorine 46 composite film.

[0013] Furthermore,

[0014] The material of the main insulation layer is ethylene propylene diene monomer rubber.

[0015] Furthermore,

[0016] The material of the inner sheath is alloy lead.

[0017] Furthermore,

[0018] The cable core further includes an outer sheath;

[0019] The outer sheath wraps around the outside of the inner sheath.

[0020] Furthermore,

[0021] The material of the outer sheath is nitrile rubber.

[0022] Furthermore,

[0023] The cable core further includes an oil-resistant cushion layer;

[0024] The oil-resistant cushion layer wraps around the outside of the inner sheath.

[0025] Furthermore,

[0026] The cable core further includes an inner armor layer;

[0027] The inner armor layer wraps around the outside of the oil-resistant cushion layer.

[0028] Furthermore,

[0029] There are three cable cores wrapped inside the inner armor layer, and the three cable cores are arranged side by side.

[0030] Furthermore,

[0031] There are two stainless steel chemical agent injection pipes, which are in contact with the outer wall of the inner armor layer, and the outer armor layer wraps around the outside of the stainless steel chemical agent injection pipes and the inner armor layer.

[0032] Based on the above technical solutions, the technical effects that the present invention can achieve are as follows:

[0033] The submersible cable for injecting chemical agents provided by the present invention is a submersible cable used for injecting chemical agents during oil production in oil wells. A bare copper conductor, an auxiliary insulating layer, a main insulating layer, and an inner sheath are sequentially wrapped and connected from the inside out, and a stainless steel chemical agent injection pipe for circulating chemical agents is arranged on the side of the cable. By setting a cable sheath layer and a steel tape armor layer, the risk of mechanical operation damaging the cable body is resisted, the practical functions of a conventional submersible cable are increased, the service life of the cable is extended, the problems of scaling and wax deposition in lifting crude oil in shale oil and high pour point oil wells are solved, the production cost is reduced, the production time is extended, the single-well output is increased, and the economic benefits are improved. Description of the Drawings

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1 It is a schematic structural diagram of the double-insulation and double-sheath submersible cable provided for Embodiment 1;

[0036] Figure 2 It is a schematic structural diagram of the double-pipe and double-armor chemical agent injection submersible cable provided for Embodiment 2.

[0037] Reference numerals: 1 - bare copper conductor; 2 - auxiliary insulating layer; 3 - main insulating layer; 4 - inner sheath; 5 - outer sheath; 6 - stainless steel chemical agent injection pipe; 7 - outer armor layer; 8 - oil-resistant cushion layer; 9 - inner armor layer. Detailed Embodiments

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0040] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0041] The present invention provides an oil-injection agent submersible cable, comprising: a cable core, a stainless-steel oil-injection agent pipe 6, and an outer armor layer 7; wherein, the cable core includes a bare copper conductor 1, an auxiliary insulating layer 2, a main insulating layer 3, and an inner sheath 4; the bare copper conductor 1, the auxiliary insulating layer 2, the main insulating layer 3, and the inner sheath 4 are connected in sequence from the inside to the outside, the auxiliary insulating layer 2 is wrapped around the outside of the bare copper conductor 1, the main insulating layer 3 is wrapped around the outside of the auxiliary insulating layer 2, and the inner sheath 4 is wrapped around the outside of the main insulating layer 3; the stainless-steel oil-injection agent pipe 6 is arranged on the side of the cable, at least one cable core is provided, at least one stainless-steel oil-injection agent pipe 6 is provided, and the stainless-steel oil-injection agent pipe 6 is used for circulating chemical agents; the outer armor layer 7 is wrapped around the outside of the cable core and the stainless-steel oil-injection agent pipe 6.

[0042] The oil-injection agent submersible cable provided by the present invention is applicable to the electrical submersible pump lifting process and supporting technical devices, and is applicable to the methods of reducing the viscosity of produced fluid, removing wax, and removing scale during the lifting and production of submersible electric pumps. It can simultaneously meet multiple functions such as strengthening the resistance to collision risks during construction, having a stronger protection ability for the cable core, being able to inject multiple agents into the pump hanging position in the wellbore at the same time, and having a wider application range, covering various well types, and meeting the growing market demand.

[0043] The oil-injection agent submersible cable provided by the present invention is a double-insulation double-sheath or double-pipe double-armor submersible cable for oil well injection agents, which can effectively reduce the risk of collision failure during the construction of submersible cables; solve problems such as difficult operation of the injection pipe when entering the well, easy bending of the pipe wall, and damage due to collision; greatly reduce the erosion damage of oil and gas intrusion to the cable core body; have a channel for chemical agents such as viscosity reducers and wax removers to reach the well fluid inlet of the rodless pump unit, increase the practical performance of the submersible cable, and at the same time have a longer service life compared with conventional submersible cables, effectively extend the pump inspection period of oil wells, and improve the adaptability of the product in complex well conditions.

[0044] Embodiment 1

[0045] The following will combine Figure 1 to describe in detail the structure and shape of the double-insulation double-sheath submersible cable provided in this embodiment.

[0046] Refer to Figure 1, the double-insulated and double-sheathed submersible oil cable includes a cable inner core, a stainless steel chemical injection pipe 6, and an outer armor layer 7. The cable inner core includes a bare copper conductor 1, an auxiliary insulation layer 2, a main insulation layer 3, an inner sheath 4, and an outer sheath 5. The bare copper conductor 1, the auxiliary insulation layer 2, the main insulation layer 3, the inner sheath 4, and the outer sheath 5 are tightly wrapped in sequence from the inside out, with a circular appearance. The auxiliary insulation layer 2 is wrapped around the outside of the bare copper conductor 1, the main insulation layer 3 is wrapped around the outside of the auxiliary insulation layer 2, the inner sheath 4 is wrapped around the outside of the main insulation layer 3, and the outer sheath 5 is wrapped around the outside of the inner sheath 4. The stainless steel chemical injection pipe 6 is located on one side of the cable core and abuts against the outside of the outer sheath 5. The outer armor layer 7 is wound around the outside of the outer sheath 5 and the stainless steel chemical injection pipe 6.

[0047] Specifically, the bare copper conductor 1 is circular; the auxiliary insulation layer 2 is a polyimide-fluorine 46 composite film; the main insulation layer 3 is made of ethylene propylene diene monomer rubber; the inner sheath 4 is made of alloy lead; the outer sheath 5 is made of nitrile rubber; the stainless steel chemical injection pipe 6 is made of 316L stainless steel; preferably, in this embodiment, there are three cable cores arranged side by side. Taking the orientation in Figure 1 as an example, the stainless steel chemical injection pipe 6 is placed on the right side of the three cable cores and has a circular appearance; finally, it is tightly wound by the steel strip outer armor layer 7 to form a flat integral structure.

[0048] Compared with the ordinary submersible oil cable, the chemical injection submersible oil cable provided in this Embodiment 1 increases the protection function and chemical injection function of the submersible oil cable. By modifying the armor equipment and designing a new type of armor mold to realize the processing function of the armor equipment, the chemical injection pipe and the submersible oil cable are integrally formed, reducing the risk of cable damage caused by construction bumps. The main steps are as follows:

[0049] Appendix Figure 1 The submersible oil cable product increases the protection effect and chemical injection function of the cable by adding an additional cable sheath and a stainless steel chemical injection pipe.

[0050] Embodiment 2

[0051] The following Figure 2 will be used to elaborate in detail on the structure and shape of the double-tube and double-armor chemical injection submersible oil cable provided in this embodiment.

[0052] Refer to Figure 2, the double-tube double-armored chemical injection submersible cable includes a cable inner core, an inner armor layer 9, a stainless steel chemical injection pipe 6, and an outer armor layer 7. Among them, the cable inner core includes a bare copper conductor 1, an auxiliary insulation layer 2, a main insulation layer 3, an inner sheath 4, an oil-resistant cushion layer 8, and an inner armor layer 9. The bare copper conductor 1, the auxiliary insulation layer 2, the main insulation layer 3, the inner sheath 4, and the oil-resistant cushion layer 8 are tightly wrapped in sequence from the inside out, with a circular appearance. The auxiliary insulation layer 2 is wrapped around the outside of the bare copper conductor 1, the main insulation layer 3 is wrapped around the outside of the auxiliary insulation layer 2, the inner sheath 4 is wrapped around the outside of the main insulation layer 3, and the oil-resistant cushion layer 8 is wrapped around the outside of the inner sheath 4. The inner armor layer 9 is wound around the outside of the oil-resistant cushion layer 8. The stainless steel chemical injection pipe 6 is located on the side of the cable core and abuts against the outside of the inner armor layer 9. The outer armor layer 7 is wound around the outside of the inner armor layer 9 and the stainless steel chemical injection pipe 6.

[0053] Specifically, the bare copper conductor 1 is circular; the auxiliary insulation layer 2 is a polyimide-fluorine 46 composite film; the material of the main insulation layer 3 is ethylene propylene diene monomer rubber; the material of the inner sheath 4 is alloy lead; the stainless steel chemical injection pipe 6 is made of 316L stainless steel and has a circular appearance. Preferably, in this embodiment, there are three cable cores arranged side by side, and the three cores are tightly wound by a steel strip inner armor layer 9 to form a flat structure; in this embodiment, there are two stainless steel chemical injection pipes 6. Figure 2 Taking the orientation in [[ ]] as an example, the two chemical injection pipes are respectively placed on both sides of the cable with the first-layer armor layer, and finally tightly wound with a layer of steel strip outer armor layer 7 to form a flat integral structure.

[0054] Compared with ordinary submersible cables, the chemical injection submersible cable provided in Embodiment 2 of the present invention increases the protection function and chemical injection function of the submersible cable. By modifying the armor equipment and designing a new type of armor mold, the processing function of the armor equipment is realized, so that the chemical injection pipe and the submersible cable are integrally formed, reducing the risk of cable damage caused by construction bumps. It is mainly carried out according to the following steps:

[0055] Appendix Figure 2 By adding a layer of Z-shaped interlocking steel strip armor layer and two chemical injection pipes to the submersible cable product, the protection effect of the cable is increased, and the function of injecting two chemical agents into the well simultaneously is realized.

[0056] For the chemical injection submersible cables in Embodiment 1 and Embodiment 2, the three cores of the two chemical injection submersible cables are connected to the submersible pump unit at the front end and to the control cabinet at the rear end, transmitting electrical energy and sensor signals for the unit; the front end of the chemical injection pipe is placed at the position of the downhole pump suction port, and the rear end is connected to the chemical addition device, injecting chemical agents into the downhole produced fluid to realize the smooth lifting function of crude oil.

[0057] In this embodiment, two composite submersible cables with different structures and injection agent functions will be designed and manufactured. By adding a cable sheath layer or a steel tape armor layer, the risk of mechanical operation damaging the cable body can be resisted, the practical functions of conventional submersible cables can be increased, the service life of the cables can be extended, the problems of scale and wax formation in lifting crude oil in shale oil and high pour point oil wells can be solved, the production cost can be reduced, the production time can be extended, the single well output can be increased, and the economic benefits can be improved.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An injection agent submersible cable, characterized in that, Including: A cable core, a stainless-steel chemical injection pipe (6), and an outer armor layer (7); wherein, the cable core includes a bare copper conductor (1), an auxiliary insulation layer (2), a main insulation layer (3), and an inner sheath (4); The bare copper conductor (1), the auxiliary insulation layer (2), the main insulation layer (3), and the inner sheath (4) are connected in sequence from inside to outside. The auxiliary insulation layer (2) wraps around the outside of the bare copper conductor (1), the main insulation layer (3) wraps around the outside of the auxiliary insulation layer (2), and the inner sheath (4) wraps around the outside of the main insulation layer (3); The stainless-steel chemical injection pipe (6) is arranged on the side of the cable core. There is at least one cable core, and there is at least one stainless-steel chemical injection pipe (6). The stainless-steel chemical injection pipe (6) is used for circulating chemical agents; The outer armor layer (7) wraps around the outside of the cable core and the stainless-steel chemical injection pipe (6).

2. The injection agent submersible cable according to claim 1, characterized in that, The auxiliary insulation layer (2) is a polyimide-fluorine 46 composite film.

3. The injection agent submersible cable according to claim 1, characterized in that, The material of the main insulation layer (3) is ethylene propylene diene monomer rubber.

4. The injection agent submersible cable according to claim 1, characterized in that, The material of the inner sheath (4) is alloy lead.

5. The injection agent submersible cable according to claim 1, characterized in that, The cable core further includes an outer sheath (5); The outer sheath (5) wraps around the outside of the inner sheath (4).

6. The injection agent submersible cable according to claim 5, characterized in that, The material of the outer sheath (5) is nitrile rubber.

7. The injection agent submersible cable according to claim 1, characterized in that, The cable core further includes an oil-resistant cushion layer (8); The oil-resistant cushion layer (8) wraps around the outside of the inner sheath (4).

8. The injection agent submersible cable according to claim 7, characterized in that, The cable core further includes an inner armor layer (9); The inner armor layer (9) wraps around the outside of the oil-resistant cushion layer (8).

9. The injection agent submersible cable according to claim 8, characterized in that, There are three cable cores wrapped inside the inner armor layer (9), and the three cable cores are arranged side by side.

10. The injection agent submersible cable according to claim 9, characterized in that, There are two stainless-steel chemical injection pipes (6). The stainless-steel chemical injection pipes (6) are in contact with the outer wall of the inner armor layer (9), and the outer armor layer (7) wraps around the outside of the stainless-steel chemical injection pipes (6) and the inner armor layer (9).

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