A fluid diverting device for horizontal well circulation cleanout

Abstract

The application provides a fluid deflection device for horizontal well circulation washing, which comprises an inner pipe and an outer pipe connected with each other, wherein the upper end of the inner pipe is closed and the lower end is open, the two ends of the outer pipe are open, the lower end of the inner pipe is connected with the inner wall of the outer pipe, the two ends of the outer pipe are connected with oil pipes respectively, the outer pipe and the oil pipes are arranged in a casing, a packer is arranged outside the outer pipe, the packer is used for sealing the annular space between the outer pipe and the casing, upper and lower water discharge holes are arranged on the outer pipe respectively, the upper and lower water discharge holes are located above and below the packer respectively, and the space in the inner pipe is communicated with the upper water discharge hole.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of horizontal well operation, and particularly relates to a fluid deflection device for circulating and washing a horizontal well. BACKGROUND

[0002] With the large-scale promotion and application of the cementing completion method at the top of the horizontal well casing, the amount of circulating and washing operation is increasing. In the current washing operation process, the washing fluid flows from the oil casing annulus, enters the external space of the screen pipe through the blocking effect of the washing packer, effectively cleans the external mud cake of the screen pipe, and then flows into the oil pipe through the washing valve, and finally circulates out of the well. This washing method has the problems of large washing fluid consumption, high cost, serious waste, strong corrosion of the washing fluid containing acid to the oil pipe and the casing, and major safety hazards to the oil well. The washing fluid circulating out of the well cannot be completely and effectively treated, causing serious environmental pollution.

[0003] CN103821471B discloses a method for processing the cement ring outside the screen pipe after cementing completion. The method can crush the cement ring outside the screen pipe by extrusion without perforation, greatly reduces the production cost, and is particularly suitable for horizontal wells. The method is to use the cement ring outside the screen pipe to extrude the acid washing pipe column to the designed position of the screen pipe, close the casing valve and blowout preventer at the wellhead, use the cement ring outside the screen pipe to extrude the cement ring extrusion device in the acid washing pipe column to seal the annulus between the oil pipe and the screen pipe, extrude and crush the cement ring outside the screen pipe outside the cement ring extrusion device from the oil pipe, and complete the exploration to the artificial well bottom in sections. The method uses the cement ring outside the screen pipe to extrude the acid washing pipe column to open the washing valve at the artificial well bottom to establish a reverse circulation washing channel, washes the near wellbore formation with the washing fluid, and carries the debris and dirt of the cement ring outside the screen pipe out of the well to the ground. However, the method has the problem of waste caused by large washing fluid consumption.

[0004] Therefore, it is a technical problem to be solved to provide a fluid deflection device for circulating and washing a horizontal well in the field of horizontal well operation. SUMMARY

[0005] The present application aims to provide a fluid deflection device for circulating and washing a horizontal well, which can greatly save the washing fluid consumption, reduce the washing cost, effectively reduce the corrosion of the washing fluid to the oil pipe and the casing, and increase the service life of the oil well.

[0006] To achieve the above object, the present application provides a fluid diverting device for horizontal well circulation washing, which comprises an inner pipe and an outer pipe connected with each other, wherein the upper end of the inner pipe is closed and the lower end is open, the two ends of the outer pipe are open, the lower end of the inner pipe is connected with the inner wall of the outer pipe, the two ends of the outer pipe are connected with oil pipes respectively, the outer pipe and the oil pipes are arranged in a casing, a packer is arranged outside the outer pipe, the packer is used for sealing the annular space between the outer pipe and the casing, the outer pipe is provided with an upper drainage hole and a lower drainage hole respectively, the upper drainage hole and the lower drainage hole are located above and below the packer respectively, and the space in the inner pipe is communicated with the upper drainage hole.

[0007] Further, the upper part of the inner pipe is provided with an annular baffle, the annular baffle is connected with the inner pipe and the outer pipe respectively, and an annular space is formed between the inner pipe and the outer pipe.

[0008] Further, the annular baffle is provided with a horizontal circulation hole, the inner pipe is provided with a through hole, and the horizontal circulation hole is connected with the through hole and the upper drainage hole respectively, so that the space in the inner pipe is communicated with the annular space between the outer pipe and the casing.

[0009] Further, the annular baffle is provided with a plurality of vertical circulation holes, and the vertical circulation holes are uniformly distributed on the annular baffle.

[0010] Further, the packer is provided with a movable gel, the packer is communicated with the annular space between the inner pipe and the outer pipe, and when the pressure reaches an opening pressure, the gel is expanded under the pressure to seal the annular space between the outer pipe and the casing.

[0011] Further, the outer pipe is provided with a liquid inlet hole, and the liquid inlet hole is connected with the packer, so that the packer is communicated with the annular space between the inner pipe and the outer pipe.

[0012] Further, the opening pressure is lower than 3 MPa; preferably, the opening pressure is 2 MPa.

[0013] Further, the lower part of the casing and the lower part of the oil pipe are connected with a washing valve.

[0014] The present application has the following advantages.

[0015] (1) The amount of washing fluid is saved, and the cost of washing is reduced.

[0016] (2) The corrosion of the washing fluid to the oil pipe and the casing is reduced, and the service life of the oil well is increased.

[0017] (3) The pollution of the washing fluid to the environment is minimized. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1is a sectional view of a fluid diverting device for circulating and washing a horizontal well provided by the present application.

[0019] Figure 2 is a schematic diagram of fluid movement in a fluid diverting device for circulating and washing a horizontal well provided by the present application.

[0020] Figure 3 is a schematic diagram of an annular baffle provided by the present application.

[0021] The meanings of the reference signs in the drawings are as follows.

[0022] 1-outer pipe, 2-annular baffle, 3-through hole, 4-lower drainage hole, 5-inner pipe, 6-packer, 7-liquid inlet hole, 8-upper drainage hole, 9-vertical circulation hole, 10-horizontal circulation hole, 11-casing. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0024] As shown in Figure 1 and Figure 2 , a fluid diverting device for circulating and washing a horizontal well comprises an inner pipe 5 and an outer pipe 1 connected to each other, the upper end of the inner pipe 5 is closed and the lower end is open, the two ends of the outer pipe 1 are open, the lower end of the inner pipe 5 is connected to the inner wall of the outer pipe 1, the two ends of the outer pipe 1 are connected to oil pipes respectively, the outer pipe 1 and the oil pipes are arranged in a casing 11, a packer 6 is arranged outside the outer pipe 1, the packer 6 is used to seal the annulus between the outer pipe 1 and the casing 11, upper and lower drainage holes 8 and 4 are arranged on the outer pipe 1 respectively, the upper and lower drainage holes 8 and 4 are located above and below the packer 6 respectively, the space in the inner pipe 5 is communicated with the upper drainage hole 8, and the lower part of the casing 11 and the lower part of the oil pipes are connected to a well washing valve.

[0025] As shown in Figures 1-3 , an annular baffle 2 is arranged on the upper part of the inner pipe 5, the annular baffle 2 is connected to the inner pipe 5 and the outer pipe 1 respectively, and an annular space is formed between the inner pipe 5 and the outer pipe 1; a horizontal circulation hole 10 is arranged in the annular baffle 2, a through hole 3 is arranged on the inner pipe 5, and the horizontal circulation hole 10 is connected to the through hole 3 and the upper drainage hole 8 respectively, so that the space in the inner pipe 5 is communicated with the annulus between the outer pipe 1 and the casing 11; three vertical circulation holes 9 are arranged in the annular baffle 2, and the vertical circulation holes 9 are uniformly distributed on the annular baffle 2.

[0026] As shown in Figures 1-2As shown, the packer 6 is provided with movable gel, and the packer 6 communicates with the annular space between the inner tube 5 and the outer tube 1. When the pressure reaches the opening pressure, the gel is expanded by the pressure to seal the annular space between the outer tube 1 and the casing 11. The outer tube 1 is provided with a liquid inlet hole 7, which is connected with the packer 6, so that the packer 6 communicates with the annular space between the inner tube 5 and the outer tube 1. The opening pressure is 2 MPa.

[0027] Specific working process: The well washing fluid enters the inner tube 5 from the oil pipe, and flows into the annular space between the inner tube 5 and the outer tube 1 from the vertical circulation hole 9 of the annular baffle 2. The well washing fluid enters the annular space between the outer tube 1 and the casing 11 from the lower drain hole 4. When the pressure of the liquid in the annular space between the inner tube 5 and the outer tube 1 reaches 2 MPa, the packer 6 is opened by the pressure, and the annular space between the outer tube 1 and the casing 11 is divided into upper and lower parts. The well washing fluid in the lower part of the annular space between the outer tube 1 and the casing 11 flows into the well washing valve, and then enters the oil pipe from the well washing valve. After the well washing fluid enters the inner tube 5 from the oil pipe, it enters the upper part of the annular space between the outer tube 1 and the casing 11 from the horizontal circulation hole 10, and then exits the horizontal well from the annular space between the outer tube 1 and the casing 11, so that the cleaning work is completed.

[0028] Obviously, the described embodiments are part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

Claims

1. A fluid diverter for use in circulating a wellbore cleaning fluid in a horizontal well, comprising: The application relates to a well washing device, which comprises the following parts: an inner pipe (5) and an outer pipe (1) connected with each other, the upper end of the inner pipe (5) is closed, the lower end is open, the two ends of the outer pipe (1) are open, the lower end of the inner pipe (5) is connected with the inner wall of the outer pipe (1), the two ends of the outer pipe (1) are connected with oil pipes respectively, the outer pipe (1) and the oil pipes are arranged in a casing pipe (11), a packer (6) is arranged outside the outer pipe (1), the packer (6) is used for sealing the annular space between the outer pipe (1) and the casing pipe (11), upper and lower water drainage holes (8) and (4) are arranged on the outer pipe (1) respectively, the upper and lower water drainage holes (8) and (4) are arranged above and below the packer (6) respectively, the space in the inner pipe (5) is communicated with the upper water drainage hole (8), an annular baffle (2) is arranged on the upper portion of the inner pipe (5), the annular baffle (2) is connected with the inner pipe (5) and the outer pipe (1) respectively, an annular space is formed between the inner pipe (5) and the outer pipe (1), a horizontal circulating hole (10) is arranged in the annular baffle (2), a through hole (3) is formed in the inner pipe (5), the horizontal circulating hole (10) is connected with the through hole (3) and the upper water drainage hole (8) respectively, so that the space in the inner pipe (5) is communicated with the annular space between the outer pipe (1) and the casing pipe (11), a plurality of vertical circulating holes (9) are arranged in the annular baffle (2) and are uniformly distributed on the annular baffle (2), the annular baffle (2) is configured to enable well washing liquid from the oil pipes to enter the lower portion of the annular space between the outer pipe (1) and the casing pipe (11) from the lower water drainage hole (4), and configured to enable the well washing liquid in the lower portion of the annular space between the outer pipe (1) and the casing pipe (11) to enter the oil pipes and then enter the upper portion of the annular space between the outer pipe (1) and the casing pipe (11) from the upper water drainage hole (8). A movable gel is arranged in the packer (6), the packer (6) is communicated with the annular space between the inner pipe (5) and the outer pipe (1), when the pressure reaches an opening pressure, the gel is expanded under the pressure to seal the annular space between the outer pipe (1) and the casing pipe (11).

2. A fluid diverter for cyclic cleanout of horizontal wells according to claim 1, wherein, A liquid inlet hole (7) is formed in the outer pipe (1), the liquid inlet hole (7) is connected with the packer (6), so that the packer (6) is communicated with the annular space between the inner pipe (5) and the outer pipe (1).

3. A fluid diverter for use in circulating a wellbore cleaning fluid in a horizontal wellbore as defined in claim 2, wherein, The opening pressure is lower than 3 MPa.

4. A fluid diverter for use in circulating a wellbore cleaning fluid in a horizontal wellbore as defined in claim 3, wherein, The lower portion of the casing pipe (11) and the lower portion of the oil pipes are connected with a well washing valve.

5. A fluid diverter for use in circulating a wellbore cleaning fluid in a horizontal wellbore as defined in claim 4, wherein, ​

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