WO2022099726A1

WO2022099726A1 - Sand settling device and method

Info

Publication number: WO2022099726A1
Application number: PCT/CN2020/129409
Authority: WO
Inventors: 尚兴宾; 成卫海; 高朋; 姜海强; 赵磊; 陈冰; 王修朝
Original assignee: 东营百华石油技术开发有限公司
Priority date: 2020-11-16
Filing date: 2020-11-17
Publication date: 2022-05-19
Also published as: CN112483065B; CN112483065A

Abstract

A sand settling device and a method. According to the sand settling device, the inner diameters of an upper oil pipe (1) and a lower oil pipe (5) are the same; the maximum outer diameter of a suspension joint (2) is larger than the inner diameters of the upper oil pipe (1) and the lower oil pipe (5), and the maximum outer diameter of the suspension joint (2) is smaller than the inner diameter of a coupling (3); the interior of the suspension joint (2) is provided with a through hole (2.1), and the lower portion of the through hole (2.1) is provided with threads; upper threads of a sand accumulation pipe (4) are connected to lower threads of the through hole (2.1), the upper portion of the sand accumulation pipe (4) is provided with a communicating slot hole (4.1), and the sand accumulation pipe (4) is placed in the lower oil pipe (5); the suspension joint (2) is situated on an upper end face of the lower oil pipe (5); the upper oil pipe (1), the coupling (3) and the lower oil pipe (5) are successively connected; and an upper shoulder face of the suspension joint (2) is located below a lower end face of the upper oil pipe (1). Sunken sand is collected in the sand accumulation pipe (4) after pumping is stopped for some reason, and sand does not fall on an electric submersible centrifugal pump, such that the sand can be prevented from blocking the electric submersible centrifugal pump and a liquid flow channel, oil well shutdowns of the electric submersible centrifugal pump can also be reduced, and the production time is extended.

Description

A kind of sand settling device and method

technical field

The invention relates to a device for producing electric submersible centrifugal pumps in oil fields, in particular to a sand settling device and method.

Background technique

At present, the production string of the electric submersible centrifugal pump is a bare oil pipe above the electric submersible centrifugal pump. When the pump is stopped for some reason, the sand in the well fluid separates and sinks and falls on the electric submersible centrifugal pump, resulting in sand sticking. The electric submersible centrifugal pump and the sand block the liquid flow channel, so that the electric submersible centrifugal pump oil well cannot be opened, and the electric submersible centrifugal pump is damaged. In order to avoid the above problems, technicians have developed a sand settling device, such as the Chinese patent 2005201265824 "electric pump sand setter", which solves this problem, but its outer pipe can only use the field Φ73 oil pipe, and its inner diameter is Φ62, the sand settling tube is in the center position, the sand settling tube occupies the liquid flow channel, and the liquid outlet channel is a concentric annular channel, which increases the liquid flow resistance and affects the smooth flow of the liquid.

technical problem

The purpose of the present invention is to aim at the above-mentioned defects existing in the prior art, to provide a kind of sand settling device and method, which is installed on the electric submersible centrifugal pump, prevents the pump from burying the electric submersible centrifugal pump and blocks the liquid flow channel, and prolongs the production of the oil well. time, and can reduce the flow resistance and improve the smoothness of the flow.

technical solutions

The technical scheme of the sand settling device mentioned in the present invention is as follows: it comprises an upper oil pipe (1), a suspension joint (2), a coupling (3), a sand accumulation pipe (4), a lower oil pipe (5), a single flow pipe The valve (6), the upper oil pipe (1) and the lower oil pipe (5) have the same inner diameter, the suspension joint (2) has a through hole (2.1) inside, and the lower part of the through hole (2.1) is threaded, and the sand pipe The upper thread of (4) is connected with the lower thread of the through hole (2.1). The upper part of the sand accumulating pipe (4) is provided with more than one communicating slot hole (4.1), and the sand accumulating pipe (4) is placed in the lower oil pipe (4.1). 5), a check valve (6) is installed at the lower part of the sand accumulating pipe (4), the suspension joint (2) is located on the upper end surface of the lower oil pipe (5), the upper oil pipe (1), the coupling (3), The lower oil pipes (5) are connected in sequence, and the upper shoulder surface of the suspension joint (2) is below the lower end surface of the upper oil pipe (1).

Preferably, the above-mentioned suspension joint (2) adopts an eccentric structure, so that after the upper thread of the sand accumulating pipe (4) is connected with the lower thread of the through hole (2.1), the sand accumulating pipe (4) is close to the lower oil pipe (5) On one side of the inner wall, a crescent-shaped channel (5.1) is formed between the sand accumulation pipe (4) and the lower oil pipe (5).

Preferably, the axis of the lower thread of the suspension joint (2) is not coaxial with the axis of the outer wall of the suspension joint (2).

Preferably, the maximum outer diameter of the suspension joint (2) is larger than the inner diameter of the upper oil pipe (1) and the lower oil pipe (5), and the maximum outer diameter of the suspension joint (2) is smaller than the inner diameter of the coupling (3).

Preferably, the valve ball in the one-flow valve (6) is made of non-metallic material.

Preferably, the above-mentioned communicating slot holes (4.1) are elongated holes or elliptical holes.

The using method of the sand settling device mentioned in the present invention comprises the following process:

First, install the sand settling device on the electric submersible centrifugal pump. A crescent-shaped channel (5.1) is formed between the inner wall of the lower oil pipe (5) and the outer wall of the sand accumulation pipe (4). The above-mentioned connecting slot (4.1) flows into the upper oil pipe (1) and reaches the ground;

Then, when the oil well stops the pump for some reason, the sand in the well fluid separates and sinks and falls into the sand accumulating pipe (4), and the check valve (6) is blocked in the sand accumulating pipe (4), so the sand will not Then fall on the electric submersible centrifugal pump;

When the oil well does not produce sand, or before the pump is not stopped at the initial stage of startup, the liquid flow can still flow upward through the check valve (6), which can reduce the flow resistance of the liquid flow;

If the oil well produces a small amount of sand, the sand deposited on the one-flow valve (6) is limited, and the liquid flow can flush it out and carry it to the surface when the pump is turned on for production; if the pump is not stopped for a long time, the sand deposited on the one-flow valve (6) The sand on the ) is also limited, and the liquid flow can also flush it out and carry it to the ground when the pump is turned on.

beneficial effect

Compared with the prior art, the beneficial effects of the present invention are as follows:

The invention can collect the sand that sinks after the pumping is stopped for some reason into the sand accumulating pipe, and the sand will not fall on the electric submersible centrifugal pump, which can avoid the sand jamming of the electric submersible centrifugal pump and the sand from blocking the liquid flow channel, and can reduce the electric Submersible centrifugal pump oil well stops production, prolongs the production time of electric pump oil well, and the sand accumulation pipe is close to the inner wall of the lower oil pipe, so that the flow channel between the sand accumulation pipe and the lower oil pipe is concentrated, which can reduce the liquid flow resistance and improve the smooth flow of the liquid. The lower part of the sand accumulating pipe is equipped with a one-flow valve, which can play the role of a flow channel when there is no sand in the sand accumulating pipe, and can reduce the liquid flow resistance.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the sectional view after the A-A place in Fig. 1 is cut away;

In the above picture: upper oil pipe 1, suspension joint 2, coupling 3, sand accumulation pipe 4, lower oil pipe 5, check valve 6, through hole 2.1, connecting slot hole 4.1, crescent channel 5.1.

BEST MODE FOR CARRYING OUT THE INVENTION

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, but not to limit the present invention.

Embodiment 1, referring to Figures 1 and 2, a sand settling device mentioned in the present invention includes an upper oil pipe 1, a suspension joint 2, a coupling 3, a sand accumulation pipe 4, a lower oil pipe 5, a check valve 6, an oil upper pipe 1. The inner diameter of the lower oil pipe 5 is the same, the inside of the suspension joint 2 has a through hole 2.1, the lower part of the through hole 2.1 is threaded, and the upper thread of the sand accumulation pipe 4 is connected with the lower thread of the through hole 2.1. The upper part of the sand pipe 4 is provided with more than one communication slot 4.1. The sand pipe 4 is placed in the lower oil pipe 5. , the upper oil pipe 1 , the coupling 3 , and the lower oil pipe 5 are connected in sequence, and the upper shoulder surface of the suspension joint 2 is below the lower end surface of the oil upper pipe 1 .

Referring to FIG. 1, the above-mentioned suspension joint 2 adopts an eccentric structure, so that after the upper thread of the sand accumulation pipe 4 is connected with the lower thread of the through hole 2.1, the sand accumulation pipe 4 is close to the inner wall side of the lower oil pipe 5, so that the sand accumulation A crescent-shaped channel 5.1 is formed between the pipe 4 and the lower oil pipe 5; the axis of the lower thread of the above-mentioned suspension joint 2 is not coaxial with the axis of the outer wall of the suspension joint 2; the maximum outer diameter of the above-mentioned suspension joint 2 is larger than that of the upper oil pipe 1 and the lower oil pipe 5 The inner diameter of the suspension joint 2 is smaller than the inner diameter of the coupling 3.

In addition, the valve ball in the above-mentioned one-flow valve 6 is made of non-metallic material, which is light in weight and easy to open. Generally Φ73 tubing, upper tubing 1, coupling 3, lower tubing 5 are standard parts, and the above-mentioned connecting slot 4.1 is a long hole, which is convenient for well fluid to enter the inner cavity of the sand accumulating tube through this hole.

First, the sand settling device is installed on the electric submersible centrifugal pump, a crescent-shaped channel 5.1 is formed between the inner wall of the lower oil pipe 5 and the outer wall of the sand accumulation pipe 4, and the well fluid passes through this channel and then passes through the communication slot 4.1. into the upper oil pipe 1, and to the ground;

Then, when the oil well stops the pump for some reason, the sand in the well fluid separates and sinks and falls in the sand accumulating pipe 4, and the check valve 6 is blocked in the sand accumulating pipe 4, so the sand will no longer fall into the electric submersible oil. on a centrifugal pump;

When the oil well does not produce sand, or before the pump is not stopped at the initial stage of startup, the liquid flow can still flow upward through the check valve 6, which can reduce the flow resistance of the liquid flow;

If the oil well produces a small amount of sand, the sand deposited on the check valve 6 is limited, and the liquid flow can flush it out and be carried to the ground when the pump is turned on for production; if the pump stops for a short time, the sand deposited on the check valve 6 It is also limited, and the liquid flow can also flush it out and be carried to the ground when the pump is turned on for production.

Embodiments of the present invention

Embodiment 2, a kind of sand settling device mentioned in the present invention, including the upper oil pipe 1, the suspension joint 2, the coupling 3, the sand accumulation pipe 4, the lower oil pipe 5, the check valve 6, the upper oil pipe 1, the lower oil pipe 5 The inner diameter is the same, there is a through hole 2.1 inside the suspension joint 2, the lower part of the through hole 2.1 is threaded, the upper thread of the sand accumulating pipe 4 is threaded with the lower part of the through hole 2.1, and the upper part of the sand accumulating pipe 4 is provided with a thread. There is more than one communication slot 4.1, the sand accumulation pipe 4 is placed in the lower oil pipe 5, the lower part of the sand accumulation pipe 4 is installed with a check valve 6, the suspension joint 2 is located on the upper end surface of the lower oil pipe 5, the upper oil pipe 1, the connection The hoop 3 and the lower oil pipe 5 are connected in sequence, and the upper shoulder surface of the suspension joint 2 is below the lower end surface of the upper oil pipe 1 .

The difference from Example 1 is that the above-mentioned communicating slot 4.1 is an oval hole, which is convenient for the well fluid to enter the inner cavity of the sand accumulation pipe through this hole. .

Sequence Listing Free Content

The above are only some preferred embodiments of the present invention, and any person skilled in the art may use the technical solutions described above to modify or modify them into equivalent technical solutions. Therefore, corresponding simple modifications or equivalent transformations made according to the technical solutions of the present invention all fall within the protection scope of the present invention.

Claims

A sand settling device is characterized in that it comprises an oil upper pipe (1), a suspension joint (2), a coupling (3), a sand accumulation pipe (4), an oil lower pipe (5), a check valve (6), an upper The inner diameter of the oil pipe (1) and the lower oil pipe (5) are the same, and the inside of the suspension joint (2) has a through hole (2.1), the lower part of the through hole (2.1) is threaded, and the upper thread of the sand accumulation pipe (4) It is threadedly connected with the lower part of the through hole (2.1), the upper part of the sand accumulating pipe (4) is provided with more than one communicating slot hole (4.1), and the sand accumulating pipe (4) is placed in the lower oil pipe (5). A check valve (6) is installed at the lower part of the sand accumulation pipe (4). The suspension joint (2) is located on the upper end surface of the lower oil pipe (5). The upper oil pipe (1), the coupling (3) and the lower oil pipe (5) are arranged in sequence. Connect, the upper shoulder surface of the suspension joint (2) is below the lower end surface of the upper oil pipe (1).
A sand settling device according to claim 1, characterized in that: the suspension joint (2) adopts an eccentric structure, so that the upper thread of the sand storage pipe (4) and the lower thread of the through hole (2.1) After connection, the sand accumulation pipe (4) is close to the inner wall side of the lower oil pipe (5), so that a crescent-shaped channel (5.1) is formed between the sand accumulation pipe (4) and the lower oil pipe (5).
The sand settling device according to claim 2, wherein the axis of the lower thread of the suspension joint (2) is not coaxial with the axis of the outer wall of the suspension joint (2).
A sand settling device according to claim 1, characterized in that: the maximum outer diameter of the suspension joint (2) is larger than the inner diameter of the upper oil pipe (1) and the lower oil pipe (5), and the maximum outer diameter of the suspension joint (2) is larger than the inner diameter of the upper oil pipe (1) and the lower oil pipe (5). The outer diameter is smaller than the inner diameter of the coupling (3).
A sand settling device according to claim 1, characterized in that: the valve ball in the one-flow valve (6) is made of non-metallic material.
A sand settling device according to claim 1, characterized in that: the communicating slot holes (4.1) are elongated holes or elliptical holes.
A kind of using method of sand settling device as described in any one of claim 1-6, it is characterized in that comprising the following process:

First, install the sand settling device on the electric submersible centrifugal pump. A crescent-shaped channel (5.1) is formed between the inner wall of the lower oil pipe (5) and the outer wall of the sand accumulation pipe (4). The above-mentioned connecting slot (4.1) flows into the upper oil pipe (1) and reaches the ground;

Then, when the oil well stops the pump for some reason, the sand in the well fluid separates and sinks and falls into the sand accumulating pipe (4), and the check valve (6) is blocked in the sand accumulating pipe (4), so the sand will not Then fall on the electric submersible centrifugal pump;

When the oil well does not produce sand, or before the pump is not stopped at the initial stage of startup, the liquid flow can still flow upward through the check valve (6), which can reduce the flow resistance of the liquid flow;

If the oil well produces a small amount of sand, the sand deposited on the one-flow valve (6) is limited, and the liquid flow can flush it out and carry it to the surface when the pump is turned on for production; if the pump is not stopped for a long time, the sand deposited on the one-flow valve (6) The sand on the ) is also limited, and the liquid flow can also flush it out and carry it to the ground when the pump is turned on.