Inverted electric submersible pump tubular column structure

Abstract

The invention relates to a tubular column structure of an inverted electric submersible pump. The tubular column structure comprises an oil pipe, an inverted electric submersible pump assembly and an injection oil pipe, the oil pipe and the injection oil pipe are fixedly connected with the upstream end and the downstream end of the inverted electric submersible pump assembly respectively; the oil pipe penetrates through the water collection layer, and the injection oil pipe penetrates through the injection layer; formation water of the water collection layer is pressurized through the inverted electric submersible pump assembly and flows out through the injection oil pipe to be injected into the injection layer, and therefore the purpose of supplementing energy to the stratum is achieved. By means of the structure, formation water of the water outlet layer can be directly reinjected into the stratum, compared with a traditional water injection system, the water injection system does not need to build a water source well station, a water injection station and other stations in the traditional water injection system, investment of a large amount of equipment and personnel can be saved, meanwhile, the water injection efficiency and quality can be improved, and good generalizability is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of oilfield exploitation and water injection, and in particular relates to an inverted submersible electric pump pipe column structure. Background Art

[0002] When an oil field is put into development, as the mining time increases, the energy of the oil layer itself is constantly consumed, causing the oil layer pressure to gradually decrease, the oil well output to decrease, resulting in a decrease in oil recovery rate, and even stopping spraying and production, resulting in a large amount of crude oil remaining underground that cannot be mined. In order to make up for the formation deficit caused by crude oil extraction, maintain or increase the oil layer pressure, achieve continuous and stable production of the oil field, and obtain a higher recovery rate, the oil layer must be injected with water. The traditional oil field water injection system uses a large-displacement water pump to pump formation water from other areas out of the ground, and then injects it into the target formation after being pressurized by a high-pressure water injection pump; especially for the same oil well, the upper end is a water layer and the lower end is an oil layer. Since it is impossible to achieve upper mining and lower injection, the formation water of the water layer can only be extracted through the packer string structure first, and then injected back into the oil layer. This process has a long cycle, low efficiency, and is not economical.

[0003] The structure of the present invention can realize the direct reinjection of the formation water of the water-producing layer into the formation. Compared with the traditional water injection system, the water injection system does not need to build water source well stations, water injection stations and other stations in the traditional water injection system, which can save a lot of equipment and personnel investment, and at the same time can improve the efficiency and quality of water injection, and has good scalability. Summary of the invention

[0004] The principle of the present invention is to extract formation water from the water-producing layer and then inject it back into the injection layer through an inverted submersible electric pump, thereby solving the problems of storage, treatment and reinjection of formation water after extraction; solving the problem of extraction and injection in oil wells, eliminating the need to build special water injection sites, improving the water injection efficiency of water injection wells, shortening the operation cycle and improving economic benefits.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] An inverted submersible electric pump pipe string structure comprises an oil pipe, an inverted submersible electric pump assembly, and an injection oil pipe; the oil pipe and the injection oil pipe are respectively fixedly connected to the upstream end and the downstream end of the inverted submersible electric pump assembly; the oil pipe passes through a water production layer, and the injection oil pipe passes through an injection layer;

[0007] The formation water in the water-producing layer is pressurized by an inverted submersible electric pump assembly, flows out through the injection oil pipe to inject water into the injection layer, thereby achieving the purpose of replenishing energy to the formation.

[0008] A water outlet is arranged at the end of the oil injection pipe.

[0009] The oil pipe is connected to the inverted submersible electric pump assembly using a threaded port.

[0010] It also includes a cable, which is connected to the inverted submersible electric pump assembly to supply power to the inverted submersible electric pump assembly.

[0011] The inverted submersible electric pump assembly is connected to the oil injection pipe through threads.

[0012] The formation water from the water-producing layer is pressurized by the inverted submersible electric pump assembly, and then flows out through the outlet of the injection pipe to inject water into the injection layer.

[0013] The cable is fixed to the oil pipe by a fixing strap.

[0014] The advantages and positive effects of the present invention are:

[0015] The structure of the present invention can realize the direct reinjection of formation water from the water-producing layer into the formation. Compared with the traditional water injection system, the water injection system does not need to build water source well stations, water injection stations and other stations in the traditional water injection system, which can save a lot of equipment and personnel investment, and at the same time can improve the efficiency and quality of water injection, and has good scalability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but it should be understood that these drawings are designed only for explanation purposes and are not intended to limit the scope of the present invention. In addition, unless otherwise specified, these drawings are intended only to conceptually illustrate the structural configurations described herein and are not necessarily drawn to scale.

[0017] Figure 1 A schematic diagram of the inverted submersible electric pump string structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0018] First of all, it should be noted that the specific structure, features and advantages of the present invention will be specifically described below by way of example, but all descriptions are only for illustration and should not be understood as limiting the present invention in any way. In addition, any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature displayed or implied in the drawings, can still be combined or deleted between these technical features (or their equivalents) to obtain more other embodiments of the present invention that may not be directly mentioned in this document. In addition, in order to simplify the drawings, the same or similar technical features may be marked only in one place in the same drawing.

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0020] like Figure 1The embodiment provides an inverted submersible electric pump string structure, comprising an oil pipe 1, an inverted submersible electric pump assembly 4, and an injection oil pipe 5; the oil pipe 1 and the injection oil pipe 5 are respectively fixedly connected to the upstream end and the downstream end of the inverted submersible electric pump assembly 4; the oil pipe passes through the water production layer 3, and the injection oil pipe passes through the injection layer 6; a water outlet 7 is provided at the end of the injection oil pipe;

[0021] The formation water in the water-producing layer is pressurized by an inverted submersible electric pump assembly, flows out through the injection oil pipe to inject water into the injection layer, thereby achieving the purpose of replenishing energy to the formation.

[0022] Specifically, the formation water from the water-producing layer 3 is pressurized by the inverted submersible pump assembly 4, and then flows out through the outlet 7 of the injection pipe 5 to inject water into the injection layer 6; the upper formation water is pumped into the injection layer 6 through the suction port device (such as the suction port device) on the inverted submersible pump assembly 4. Figure 1 As shown in the figure, the formation water enters the inverted submersible electric pump 4, and the formation water pressurized by the inverted submersible electric pump 4 is injected into the water injection layer through the water outlet 7, thereby realizing that the water-producing layer accurately enters the inverted submersible electric pump assembly 4, and the formation water pressurized by the inverted submersible electric pump assembly 4 is accurately injected into the water injection layer through the water outlet 7.

[0023] The oil pipe 1 is connected to the inverted submersible electric pump assembly 4 by using a threaded port; the inverted submersible electric pump assembly is connected to the oil injection pipe 5 by a threaded port.

[0024] It also includes a cable 2, which is connected to the inverted submersible electric pump assembly 4 to supply power to the inverted submersible electric pump assembly; the cable 2 is fixed to the oil pipe 1 by a fixing strap.

[0025] It should be noted that the inverted submersible electric pump assembly in this embodiment adopts existing products, and it is not necessary to stick to a specific model or structure as long as it can achieve the functions of this embodiment.

[0026] The method of the invention solves the problem of upper production and lower injection in the same well, improves the water injection efficiency of the water injection well, shortens the operation cycle, and improves the economic benefit.

[0027] The system has been tested in a certain oil field and applied to 4 water injection wells, eliminating the need to build a surface water station and the process of pressurizing the water from the water-producing layer and injecting it back into the water injection layer through the surface water injection station. It has greatly shortened the water injection cycle, improved the water injection efficiency, and saved more than 2 million yuan in total. It meets all the technical indicators of the designed water injection and has a good overall application effect.

[0028] The above embodiments describe the present invention in detail, but the contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the present invention.

Claims

1. An inverted submersible electric pump string structure, characterized in that: It comprises an oil pipe, an inverted submersible electric pump assembly, and an injection oil pipe; the oil pipe and the injection oil pipe are respectively fixedly connected to the upstream end and the downstream end of the inverted submersible electric pump assembly; the oil pipe passes through the water production layer, and the injection oil pipe passes through the injection layer; The formation water in the water-producing layer is pressurized by an inverted submersible electric pump assembly, flows out through the injection oil pipe to inject water into the injection layer, thereby achieving the purpose of replenishing energy to the formation.

2. According to claim 1, an inverted submersible electric pump string structure is characterized in that: A water outlet is arranged at the end of the oil injection pipe.

3. The inverted submersible electric pump string structure according to claim 1, characterized in that: The oil pipe is connected to the inverted submersible electric pump assembly using a threaded port.

4. The inverted submersible electric pump string structure according to claim 1, characterized in that: It also includes a cable, which is connected to the inverted submersible electric pump assembly to supply power to the inverted submersible electric pump assembly.

5. The inverted submersible electric pump string structure according to claim 1 is characterized in that: The inverted submersible electric pump assembly is connected to the oil injection pipe through threads.

6. The inverted submersible electric pump string structure according to claim 2, characterized in that: The formation water from the water-producing layer is pressurized by the inverted submersible electric pump assembly, and then flows out through the outlet of the injection pipe to inject water into the injection layer.

7. The inverted submersible electric pump string structure according to claim 1, characterized in that: The cable is fixed to the oil pipe by a fixing strap.

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