Swirl flushing tool

Abstract

The present invention belongs to the technical field of oilfield production equipment, and particularly relates to a swirl flushing tool, which includes a power mechanism, an upper joint, an internal hexagonal set screw, a stainless steel brush, a flushing joint, a stainless steel ball, a backwashing valve, a set screw, a screen connection joint, a stainless steel screen pipe, an outer cylinder, a diversion pipe, a lower joint and a lower connection cylinder; the upper joint is connected to the power mechanism, and its lower end is connected to the stainless steel brush, and the flushing joint passes through the stainless steel brush and is connected to the upper joint; the stainless steel ball is installed in the backwashing valve, and the backwashing valve is installed in the flushing joint; the screen connection joint is connected to the bottom end of the flushing joint, and is locked by a set screw and sealed by an O-ring, and the stainless steel screen pipe is installed at the lower end of the screen connection joint, and the bottom end of the screen connection joint is connected to the outer cylinder; the diversion pipe is installed on the lower joint, and the lower joint is respectively connected to the outer cylinder and the lower connection cylinder. It is used for flushing the inner wall of the casing and collecting sediment and impurities in the well section, with safe and reliable construction, obvious cleaning effect, energy conservation and environmental protection.

Description

Technical Field

[0001] The present invention belongs to the technical field of oilfield production equipment, and particularly relates to a swirl flushing tool. Background Art

[0002] In the middle and late stages of oilfield development, due to loose cementation of oil layers, unreasonable working systems of oil wells, and improper measures, etc., sand production in oil wells will occur. After sand production in oil wells, if the liquid flow in the well cannot carry all the sand out to the ground, the sand in the well will gradually precipitate, blocking the oil outlet channel or burying the oil layer, reducing the production of oil wells or even shutting them down. Therefore, measures need to be taken to eliminate the accumulated sand. However, the conventional sand washing process for oil and water wells is hydraulic sand washing. Hydraulic sand washing is to lower a sand washing string, and use a cement truck to inject high-speed water flow from the tubing. Under the action of this high-speed water flow, the formation sand grains are carried out to the ground from the annulus between the casing and the tubing. The conventional hydraulic sand washing process has complex on-site operations, requires a lot of equipment, high costs, and poor sand washing effects. Therefore, it is very necessary to design a swirl flushing tool. Summary of the Invention

[0003] In order to solve the above technical problems, a swirl flushing tool is provided. The swirl flushing tool mainly forms a high-speed swirl in the casing, and can flush the casing and collect the sediment and impurities sinking in the well. It is used for flushing the inner wall of the casing and collecting the sediment and impurities in the well section. The construction is safe and reliable, the cleaning effect is obvious, and it is energy-saving and environmentally friendly.

[0004] The technical solution adopted by the present invention is as follows: a swirl flushing tool, the flushing tool includes a power mechanism, an upper joint, an internal hexagonal set screw, a stainless steel brush, a flushing joint, a stainless steel ball, a backwashing valve, a set screw, a screen pipe connection joint, a stainless steel screen pipe, an outer cylinder, a guide pipe, a lower joint and a lower connecting cylinder; the upper end of the upper joint is connected to the power mechanism, and its lower end is connected to the stainless steel brush. The flushing joint passes through the stainless steel brush and is connected to the upper joint, and is locked by an internal hexagonal set screw and sealed by an O-ring; the stainless steel ball is installed in the backwashing valve, and the backwashing valve is installed in the flushing joint and sealed by an O-ring; the screen pipe connection joint is connected to the bottom end of the flushing joint and locked by a set screw and sealed by an O-ring. The stainless steel screen pipe is installed at the lower end of the screen pipe connection joint, and the bottom end of the screen pipe connection joint is connected to the outer cylinder; the guide pipe is installed on the lower joint and sealed by an O-ring, and the lower joint is respectively connected to the outer cylinder and the lower connecting cylinder.

[0005] Further, the upper joint is provided with a water eye.

[0006] Further, the flushing joint is provided with a nozzle.

[0007] Further, the power mechanism is a positive displacement motor.

[0008] Further, the positive displacement motor is a 5LZ95×7.0 type positive displacement motor.

[0009] Further, the swirl flushing tool mainly consists of a power part and a swirl flushing part. It has stable power, can transmit a relatively large torque, and the swirl flushing part is not easily stuck. Through the high-speed fluid rotating to scour the inner wall of the casing and the mechanical brushing of the wire brush attached to the tool, the sediment and impurities in the well section and the oil scale on the well wall can be effectively cleaned.

[0010] The beneficial effects of the present invention: It provides a swirl flushing tool. The swirl flushing tool mainly forms a high-speed swirl in the casing, which can flush the casing and collect the sediment and impurities sinking in the well. It can effectively clean the sediment in the casing and the oil scale on the inner wall of the casing. It is mainly used for flushing the inner wall of the 5 1 / 2 casing and collecting the sediment and impurities in the well section. It has a simple structure, is convenient to operate, saves time and effort, is safe and reliable in construction, has obvious cleaning effect, and is energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is the structural schematic diagram of Embodiment 1.

[0012] Figure 2 is Figure 1 the partial enlarged view of A-A in

[0013] Figure 3 is Figure 1 the partial enlarged view of B-B in

[0014] Figure 4 is Figure 1 the partial enlarged view of C-C in

[0015] Figure 5 is Figure 1 the partial enlarged view of D-D in DETAILED DESCRIPTION OF THE INVENTION Embodiment

[0016] Referring to the various figures, a swirl flushing tool, the flushing tool comprising a power mechanism 1, an upper joint 2, an internal hexagonal set screw 4, a stainless steel brush 5, a flushing joint 7, a stainless steel ball 8, a backwashing valve 9, a set screw 10, a screen pipe connection joint 11, a stainless steel screen pipe 12, an outer cylinder 13, a diversion pipe 14, a lower joint 15 and a lower connection cylinder 16; the upper end of the upper joint 2 is connected to the power mechanism 1, and its lower end is connected to the stainless steel brush 5. The flushing joint 7 passes through the stainless steel brush 5 and is connected to the upper joint 2, and is locked by an internal hexagonal set screw 4 and sealed by an O-ring; the stainless steel ball 8 is installed in the backwashing valve 9, and the backwashing valve 9 is installed in the flushing joint 7 and sealed by an O-ring; the screen pipe connection joint 11 is connected to the bottom end of the flushing joint 7 and is locked by a set screw 10 and sealed by an O-ring. The stainless steel screen pipe 12 is installed at the lower end of the screen pipe connection joint 11, and the bottom end of the screen pipe connection joint 11 is connected to the outer cylinder 13; the diversion pipe 14 is installed on the lower joint 15 and sealed by an O-ring, and the lower joint 15 is respectively connected to the outer cylinder 13 and the lower connection cylinder 16; a water eye 3 is provided on the upper joint 2; a nozzle 6 is provided on the flushing joint 7; the power mechanism 1 is a positive displacement motor, and the positive displacement motor is a 5LZ95×7.0 type positive displacement motor.

[0017] The swirl flushing tool is mainly composed of two parts, which are the power part and the swirl flushing part from top to bottom. Among them, the power part uses a "5LZ95×7.0" type positive displacement motor, with stable power and a relatively large transmitted torque. When conducting the construction of positive circulation well flushing, the high-pressure well flushing fluid flows through the power part of the tool, and the positive displacement motor provides power to drive the lower swirl flushing part to rotate. The fluid enters the inner cavity of the flushing joint from the lower end of the power part, and then sprays out from the water eye, forming a high-speed rotation in the casing to flush the inner wall of the casing. At the same time, under the action of the high-speed swirl, the sediment and impurities in the well section are fully stirred, effectively destroying the sand bed, making the sand and impurities always in a suspended state, which is conducive to the flushing fluid carrying away the formation gravel and impurities. At the same time, under the blocking action of the stainless steel brush, the well flushing fluid carrying gravel and impurities enters from the inner hole of the lower connection cylinder at the lower end of the swirl flushing part, flows through the diversion pipe, and enters the inside of the outer cylinder. At this time, part of the gravel and impurities will fall and settle in the outer cylinder under the action of gravity. When part of the larger-volume gravel or impurities that have not settled pass through the stainless steel screen pipe, they will be blocked by the screen pipe and fall and settle. The well flushing fluid carrying smaller-volume gravel or impurities passes through the annulus between the stainless steel brush and the flushing joint and sprays out from the water eye at the upper end of the upper joint, flowing back to the ground. On the other hand, while the well flushing fluid flushes the inner wall of the casing, since the outer diameter of the stainless steel brush is larger than the inner diameter of the casing, the inner wall of the wellbore will be mechanically brushed again. During the flushing and brushing, the tool is slowly lowered or slowly lifted, which can effectively clean the sediment and impurities in the casing of the well section being scoured and the oil scale on the well wall.

Claims

1. A swirling flushing tool, characterized in that: the flushing tool comprises a power mechanism (1), an upper sub (2), an internal hexagonal setscrew (4), a stainless steel brush (5), a flushing sub (7), a stainless steel ball (8), a backwashing valve (9), a setscrew (10), a screen pipe connection sub (11), a stainless steel screen pipe (12), an outer cylinder (13), a diversion pipe (14), a lower sub (15) and a lower connection cylinder (16); the upper end of the upper sub (2) is connected to the power mechanism (1), and its lower end is connected to the stainless steel brush (5); the flushing sub (7) passes through the stainless steel brush (5) and is connected to the upper sub (2), and is locked by the internal hexagonal setscrew (4) and sealed by an O-ring; the stainless steel ball (8) is installed in the backwashing valve (9), and the backwashing valve (9) is installed in the flushing sub (7) and sealed by an O-ring; the screen pipe connection sub (11) is connected to the bottom end of the flushing sub (7) and is locked by the setscrew (10) and sealed by an O-ring, and the stainless steel screen pipe (12) is installed at the lower end of the screen pipe connection sub (11), and the bottom end of the screen pipe connection sub (11) is connected to the outer cylinder (13); the diversion pipe (14) is installed on the lower sub (15) and sealed by an O-ring, and the lower sub (15) is respectively connected to the outer cylinder (13) and the lower connection cylinder (16); the upper sub (2) is provided with a water eye (3); the flushing sub (7) is provided with a nozzle (6).

2. The swirling flushing tool according to claim 1, characterized in that: the power mechanism (1) is a positive displacement motor.

3. The swirling flushing tool according to claim 2, characterized in that: the positive displacement motor is a 5LZ95×7.0 type positive displacement motor.

Images