An electric submersible pump suspension system

Abstract

The present invention discloses an electric submersible pump suspension system, comprising a three-way joint, an electric submersible pump and a bypass pipe, wherein the three-way joint is connected to a first oil pipe at the top and to the electric submersible pump and the bypass pipe at the bottom; the electric submersible pump and the bypass pipe respectively constitute a production channel and a bypass pipe channel. The present invention can meet the requirements of using a commonly used 101 electric submersible pump for well repair in a small borehole oil well with 7-inch casing completion. Since two channels, the production channel and the bypass pipe channel, are used, stratified mining can be achieved, and bypass pipe channel control can be achieved by adding a fluid control tool (standard wireline operation).

Description

Technical Field

[0001] The invention belongs to oil well mining equipment, and in particular relates to an electric submersible pump suspension system. Background Art

[0002] After an oil well has been mined for a period of time, it enters the middle and late stages of development. The reservoir pressure decreases, the output decreases, and it may even stop flowing. It is necessary to take some artificial lifting measures to stabilize production, increase production, and improve the recovery rate.

[0003] The electric submersible pump is one of the most efficient artificial lift methods, with a system efficiency of 35-60%, a wide operating range, suitable for a variety of complex well conditions, and a wide range of applications. Especially in offshore oil fields, electric submersible pump systems are often used to repair wells to ensure stable production of oil wells.

[0004] As oil prices fall, in order to control drilling costs, people are increasingly inclined to use small boreholes (7-inch casing running into the reservoir) with low consumption, high speed and low cost to complete wells. A number of small borehole oil wells in the South my country Sea have been in production for many years and need to be repaired and an electric submersible pump system run to ensure normal production.

[0005] The 101 ESPs commonly used in my country are generally used in 7 5 / 8 or 9 5 / 8 casings larger than 7 inches. There is no suspension system that can be used with 101 ESPs and is compatible with 7-inch casings. Summary of the invention

[0006] The object of the present invention is to provide an electric submersible pump suspension system which can be matched with a 7-inch casing.

[0007] The technical solution adopted to achieve the purpose of the present invention is as follows:

[0008] The electric submersible pump suspension system provided by the present invention comprises a tee joint, an electric submersible pump and a bypass pipe, wherein the tee joint is connected to a first oil pipe at the top and to the electric submersible pump and the bypass pipe at the bottom; the electric submersible pump and the bypass pipe constitute a production channel and a bypass pipe channel respectively.

[0009] A bypass pipe, a tool, a double-tube four-way joint and a second oil pipe are provided between the three-way joint, the electric submersible pump and the bypass pipe. The upper and lower joints of the first channel of the double-tube four-way joint are respectively connected to the second oil pipe and the electric submersible pump, and the upper and lower joints of the second channel of the double-tube four-way joint are respectively connected to the tool and the bypass pipe. The second oil pipe, the first channel of the double-tube four-way joint and the electric submersible pump constitute a production channel, and the tool, the second channel of the double-tube four-way joint and the bypass pipe constitute a bypass pipe channel.

[0010] A bypass pipe, a tool, a double-tube four-way joint, an oil pin, a rotary locking joint, a variable buckle joint, a second oil pipe and a third oil pipe are arranged between the three-way joint and the electric submersible pump and the bypass pipe. The three-way joint is connected to the second oil pipe and the plugging device working cylinder at the bottom, the second oil pipe is connected to the rotary locking joint at the bottom, and the rotary locking joint is connected to the upper joint of the first channel of the double-tube four-way joint at the bottom; the tool is connected to the oil pin at the bottom, the oil pin is connected to the third oil pipe at the bottom, the third oil pipe is connected to the upper joint of the second channel of the double-tube four-way joint at the bottom, the lower joint of the second channel of the double-tube four-way joint is connected to the bypass pipe, the lower joint of the first channel of the double-tube four-way joint is connected to the variable buckle joint, and the variable buckle joint is connected to the electric submersible pump at the bottom. The second oil pipe, the rotary locking joint, the first channel of the double-tube four-way joint, the variable buckle joint and the electric submersible pump constitute a production channel, and the plugging device working cylinder, the oil pin, the third oil pipe, the second channel of the double-tube four-way joint and the bypass pipe constitute a bypass pipe channel.

[0011] The tool adopts a plugging mandrel.

[0012] The outer diameter of the three-way joint is less than or equal to 158.52 mm, the outer diameter of the electric submersible pump is 101 mm, and the inner diameter of the bypass pipe is 46 mm.

[0013] Beneficial Effects

[0014] The present invention can meet the requirements of using the commonly used 101 electric submersible pump for well repair in small-bore oil wells with 7-inch casing completion. Since two channels, a production channel and a bypass pipe channel, are used, layered production can be achieved, and bypass pipe channel control can be achieved by adding a fluid control tool (standard wireline operation).

[0015] The technical solution of the present invention is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of embodiment 1 of the present invention.

[0017] Figure 2 It is a schematic diagram of the structure of embodiment 2 of the present invention.

[0018] Figure 3 It is a structural diagram of embodiment 3 of the present invention.

[0019] Figure 4 It is a schematic structural diagram of the rotary locking joint in Example 3 of the present invention.

[0020] Figure 5 It is a schematic diagram of the structure of the oil-containing oil in Example 3 of the present invention. DETAILED DESCRIPTION

[0021] Example 1

[0022] See Figure 1The electric submersible pump suspension system provided by the present invention comprises a three-way joint 2, an electric submersible pump 3 and a bypass pipe 4. The three-way joint 2 is connected to an oil pipe 1 at the top and to the electric submersible pump 3 and the bypass pipe 4 at the bottom. The electric submersible pump 3 and the bypass pipe 4 constitute a production channel A and a bypass pipe channel B respectively.

[0023] The outer diameter of the tee joint 2 is less than or equal to 158.52 mm, the outer diameter of the electric submersible pump 3 is 101 mm, and the inner diameter of the bypass pipe 4 is 46 mm.

[0024] Example 2

[0025] The electric submersible pump suspension system can add tools to the bypass pipeline when it is necessary to block the channel below the bypass pipeline. The structure is as follows: Figure 2 As shown, it includes a tee joint 2, an electric submersible pump 3, a bypass pipe 4, a tool 5, a double-tube cross-joint 6 and an oil pipe 1′. The tee joint 2 is connected to the oil pipe 1 at the top and to the tool 5 and the oil pipe 1′ at the bottom; the upper and lower joints of the first channel of the double-tube cross-joint 6 are respectively connected to the oil pipe 1′ and the electric submersible pump 3, and the upper and lower joints of the second channel of the double-tube cross-joint 6 are respectively connected to the tool 5 and the bypass pipe 4. The oil pipe 1′, the first channel of the double-tube cross-joint 6 and the electric submersible pump 3 constitute a production channel, and the tool 5, the second channel of the double-tube cross-joint 6 and the bypass pipe 4 constitute a bypass pipe channel.

[0026] Example 3

[0027] ESP suspension system, such as Figure 3 As shown, it includes a tee joint 2, an electric submersible pump 3, a bypass pipe 4, a tool 5, a double-tube four-way joint 6, an oil plug 7, a rotary locking joint 8, a variable buckle joint 9, an oil pipe 1' and an oil pipe 1", and the tool 5 adopts a plugging mandrel; the tee joint 2 is connected to the oil pipe 1' and the plugging mandrel 5 at the bottom, and the plugging mandrel 5 has an optional cross-section, and can be used with an appropriate one-way valve plug to unidirectionally block the following bypass pipeline; the oil pipe 1' is connected to the rotary locking joint 8 at the bottom, and the rotary locking joint 8 is as shown in the attached Figure 4 As shown, it is composed of an upper joint 801, an outer tube 802, a central tube 803 and a lower joint 804 connected in sequence, and an O-ring 805 is provided between the outer tube 802 and the central tube 803; the rotating locking joint 8 is variable in length, which can meet the requirements of adjusting the length of the double-tube installation, and the rotating locking joint 8 is connected to the upper joint of the first channel of the double-tube four-way joint 6; the plugging working cylinder 5 is connected to the oil 7, and the oil 7 is as shown in the attached Figure 5As shown, it is composed of an upper joint 701 and a lower joint 705 connected to each other and a sleeve 702 arranged between the upper joint 701 and the lower joint 705. An O-ring 703 is arranged between the upper joint 701 and the lower joint 705. The phase angle between the upper and lower joints 701 and 705 is adjustable to meet the requirements of adjusting the phase angle in double-tube installation. The oil pipe 7 is connected to the oil pipe 1″ at the bottom, and the oil pipe 1″ is connected to the upper joint of the second channel of the double-tube four-way joint 6 at the bottom. The lower joint of the second channel of the double-tube four-way joint 6 is connected to the bypass pipe 4. The lower joint of the first channel of the double-tube four-way joint 6 is connected to the variable buckle joint 9, and the variable buckle joint 9 is connected to the electric submersible pump 3 at the bottom. The oil pipe 1′, the rotary locking joint 8, the first channel of the double-tube four-way joint 6, the variable buckle joint 9 and the electric submersible pump 3 form a production channel, and the plugging mandrel 5, the oil pipe 7, the oil pipe 1″, the second channel of the double-tube four-way joint 6 and the bypass pipe 4 form a bypass pipe channel.

[0028] There is a plugging working cylinder 5 at the upper part of the bypass pipe channel, and appropriate tools such as a plugging device or a check valve plugging device can be selected to realize the fluid control function of normal flow, one-way cut-off or two-way cut-off; the bypass pipe 4 of the bypass pipe channel can also be connected with tools such as a sliding sleeve. The bypass pipe channel has a larger diameter (inner diameter 46mm) to allow the switch tool to pass through using a standard wire operation method, and the switch sliding sleeve.

Claims

1. An electric submersible pump suspension system, characterized in that It comprises a three-way joint, an electric submersible pump and a bypass pipe. The three-way joint is connected to the first oil pipe at the top and is connected to the electric submersible pump and the bypass pipe at the bottom. The electric submersible pump and the bypass pipe constitute a production channel and a bypass pipe channel respectively. A bypass pipe, a tool, a double-tube four-way joint, an oil pin, a rotary locking joint, a variable buckle joint, a second oil pipe and a third oil pipe are arranged between the three-way joint, the electric submersible pump and the bypass pipe. The three-way joint is connected to the second oil pipe and the plugging working cylinder at the bottom. The second oil pipe is connected to the rotary locking joint at the bottom. The rotary locking joint is connected to the upper joint of the first channel of the double-tube four-way joint at the bottom. The tool is connected to the oil pin at the bottom, the oil pin is connected to the third oil pipe at the bottom, and the third oil pipe at the bottom. The third oil pipe is connected to the upper joint of the second channel of the double-tube four-way joint at the bottom, the lower joint of the second channel of the double-tube four-way joint is connected to the bypass pipe, the lower joint of the first channel of the double-tube four-way joint is connected to the variable buckle joint, the variable buckle joint is connected to the electric submersible pump at the bottom, the second oil pipe, the rotary locking joint, the first channel of the double-tube four-way joint, the variable buckle joint and the electric submersible pump constitute a production channel, the plugging mandrel, the oil plug, the third oil pipe, the second channel of the double-tube four-way joint and the bypass pipe constitute a bypass pipe channel; the outer diameter of the three-way joint is less than or equal to 158.52mm, the outer diameter of the electric submersible pump is 101mm, and the inner diameter of the bypass pipe is 46mm.

2. The electric submersible pump suspension system according to claim 1, characterized in that A bypass pipe, a tool, a double-tube four-way joint and a second oil pipe are provided between the three-way joint, the electric submersible pump and the bypass pipe. The upper and lower joints of the first channel of the double-tube four-way joint are respectively connected to the second oil pipe and the electric submersible pump, and the upper and lower joints of the second channel of the double-tube four-way joint are respectively connected to the tool and the bypass pipe. The second oil pipe, the first channel of the double-tube four-way joint and the electric submersible pump constitute a production channel, and the tool, the second channel of the double-tube four-way joint and the bypass pipe constitute a bypass pipe channel.

3. The electric submersible pump suspension system according to claim 2, characterized in that The tool adopts a plugging mandrel.

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