Online profile control and displacement mixing device and online profile control and displacement system

Abstract

The invention discloses an online profile control and displacement mixer and an online profile control and displacement mixing system. The system comprises a polymer mixing system, a cross-linking agent mixing system, a first liquid pump, a second liquid pump, the online profile control and displacement mixer and a Christmas tree. The polymer mixing system and the cross-linking agent mixing system are respectively communicated with an online profile control and displacement mixer through a first liquid pump and a second liquid pump, and the online profile control and displacement mixer is connected with a Christmas tree; the on-line profile control and displacement mixer comprises a mixer body, a centralizer, a screw rod and a spiral guide vane; two bypass holes connected with bypass branch pipes are symmetrically formed in the mixer body; the screw is centrally arranged in the mixer body, and the top end of the screw is connected with the motor; the centralizer is fixed on the outer wall of the upper side of the screw rod; the spiral guide vane is fixed on the outer wall of the lower side of the screw rod; the on-line profile control and displacement mixer and the mixing system are reasonable in structural design, simple and practical in operation process, safe and reliable, small in polymer shear and uniform in mixing, the single well regulation and control cost is reduced, and the regulation and control efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material mixing equipment used in the field of petroleum extraction, and in particular to an online control and drive mixer and an online control and drive system. Background Art

[0002] As the oil field enters the late stage of high water content development, profile control, flooding control, water plugging and chemical flooding have become one of the most studied and applied chemical flooding technologies at home and abroad. At present, the single-well profile control and flooding control methods are mainly used on site, but they have the following disadvantages: 1) The skid-mounted equipment is used for construction on the water injection well, which has high construction costs, more than 400,000 yuan per well, and a long construction period, more than 15 days per well; 2) The pump truck is used for injection, the construction displacement is large, the pressure rise cannot be controlled, and excessive pressure can easily lead to contamination and blockage of the medium and low permeability layers; 3) When the overall profile of the block is adjusted, there are many wells and a large workload. The single-well profile control method affects the flooding effect and efficiency.

[0003] The patent CN102787832A has disclosed an intelligent profile control injection system. This set of equipment is equipped with two mixing tanks, two liquid storage tanks, a mixing room, two hydraulic profile control water plugging pumps, etc. Not only is the equipment large in scale, but the profile control process is complex and the cost is high. It is only suitable for large-volume profile control and profile control operations, but not for smaller-scale profile control and profile control operations. Therefore, based on the above technical problems, it is necessary to design an online mixer suitable for profile control, drive control, and chemical drive based on actual on-site construction and production design experience, so as to reduce the cost of single well control, improve control efficiency, and achieve the purpose of reducing costs and increasing efficiency. Summary of the invention

[0004] The purpose of the present invention is to provide an online drive mixer which has a simple and practical operation process, is safe and reliable, has little shearing effect on polymers, and can ensure uniform mixing.

[0005] Another object of the present invention is to provide an online control and drive system composed of an online control and drive mixer.

[0006] To this end, the technical solution of the present invention is as follows:

[0007] An online control and drive mixer comprises a mixer body, a centralizer, a screw and a spiral guide vane; wherein the mixer body is a vertically arranged cylindrical barrel, and a first bypass hole and a second bypass hole are symmetrically opened on the opposite side walls of the barrel, and the first bypass branch pipe and the second bypass branch pipe are respectively connected to the two through holes, so that the barrel chamber located below the two bypass holes is a liquid mixing chamber; the inner wall of the bottom end of the barrel is processed into a tapered port with an inner diameter gradually decreasing from top to bottom; the screw is centrally arranged in the inner cavity of the mixer body, the top end of which extends to the outside of the mixer body and is connected and fixed to the output shaft of the motor through a coupling, and the bottom end of the screw is located at the mixing The top side of the tapered port of the mixer body; the centralizer is mounted on and fixed on the upper outer wall of the screw; the spiral guide vane is mounted on and fixed on the lower outer wall of the screw, and its top end is flush with the bottom of the two bypass holes, and its bottom end is flush with the bottom end of the screw; the inner diameter of the first bypass branch pipe is the same as that of the second bypass branch pipe, the inner diameter of the mixer body is 1.5 to 2 times the inner diameter of the bypass branch pipe, and the axial height of the liquid mixing chamber is 1 / 2 to 1 / 3 times the inner diameter of the mixer body; the axial length of the tapered port is 1 / 10 to 1 / 20 times the axial height of the liquid mixing chamber, and the inner diameter of the bottom end of the tapered port is 3 / 5 to 4 / 5 of the inner diameter of the top end.

[0008] Furthermore, an upper flange is mounted and fixed on the outer wall of the top end of the cylinder, and a lower flange is mounted and fixed on the outer wall of the bottom end of the cylinder; a first bypass flange is mounted and fixed on the outer wall of the pipe end of the first bypass branch pipe, and a second bypass flange is mounted and fixed on the outer wall of the pipe end of the second bypass branch pipe.

[0009] Furthermore, the outer diameter of the spiral guide blade is 2 mm to 5 mm smaller than the inner diameter of the mixer body, and the angle formed between the spiral guide blade and the axial direction of the screw is 45° to 60°.

[0010] Furthermore, the outer diameter of the centralizer is 3 mm to 5 mm smaller than the inner diameter of the mixer body.

[0011] An online control and displacement system formed by using the online control and displacement mixer comprises a polymer mixing system, a crosslinking agent mixing system, a first liquid pump, a second liquid pump, an online control and displacement mixer and a Christmas tree; wherein the polymer mixing system comprises at least two polymer mixing tanks, each of which is provided with an agitator; the crosslinking agent mixing system is arranged on the adjacent side of the polymer mixing system, and comprises at least two crosslinking agent mixing tanks, each of which is provided with an agitator; the outlet end of each polymer mixing tank is simultaneously connected to the inlet end of the first liquid pump through a pipeline and forms a communication, and an opening and closing valve is provided on the pipeline connected to the outlet end of each polymer mixing tank; the outlet end of each crosslinking agent mixing tank is simultaneously connected to the inlet end of the second liquid pump through a pipeline and forms a communication, and an opening and closing valve is provided on the pipeline connected to the outlet end of each crosslinking agent mixing tank; the first bypass branch pipe end is connected to the outlet end of the first liquid pump through a pipeline through a first bypass flange and forms a communication; the second bypass branch pipe end is connected to the outlet end of the second liquid pump through a pipeline through a second bypass flange and forms a communication.

[0012] Compared with the existing technology, the online control and displacement mixer and its online control and displacement mixing system have a reasonable structural design, and the operation process is simple and practical, safe and reliable, with little shearing of the polymer and uniform mixing. It not only eliminates the complex construction process of on-site mixing and stirring of existing control and displacement and profile control equipment, but also reduces the control cost of a single well, improves the control efficiency, and achieves the purpose of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the online drive control system of the present invention;

[0014] Figure 2 It is a cross-sectional view of an online control and drive mixer of the online control and drive system of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the following embodiments are by no means intended to limit the present invention in any way.

[0016] See also Figure 1 The online control and displacement system includes a polymer mixing system 11 , a cross-linking agent mixing system, a first liquid pump 14 , a second liquid pump 15 , an online control and displacement mixer 16 and a Christmas tree 17 .

[0017] The polymer mixing system 11 includes two polymer mixing tanks. Each polymer mixing tank is provided with an agitator in the tank body for preparing a polymer solution of a specified concentration and meeting the on-site dosage requirements.

[0018] The crosslinking agent mixing system is arranged adjacent to the polymer mixing system 11, and comprises a first crosslinking agent mixing tank 12 and a second crosslinking agent mixing tank 13, both tanks are provided with agitators for preparing different crosslinking agent solutions compatible with the polymer solution and meeting the on-site dosage requirements.

[0019] The outlet ends of the two polymer mixing tanks are connected to the inlet end of the first liquid pump 14 through pipelines to form a communication, and an opening and closing valve is provided on the pipeline connected to the outlet end of each polymer mixing tank.

[0020] The outlet ends of the first crosslinking agent mixing tank 12 and the second crosslinking agent mixing tank 13 are connected to the inlet end of the second liquid pump 15 through pipelines and form a communication, and an opening and closing valve is provided on the pipeline connected to the outlet end of each crosslinking agent mixing tank.

[0021] The online control and displacement mixer 16 is used to fully mix the polymer solution and the cross-linking agent solution to be transported to the wellbore online, so that the mixed solution meets the requirements for being pumped into the wellbore.

[0022] See also Figure 2 The online drive mixer 16 includes a mixer body, an upper flange 1, a centralizer 2, a screw 3, a spiral guide vane 4, a lower flange 6, a first bypass flange 8 and a second bypass flange 9;

[0023] The mixer body is a vertically arranged cylindrical barrel, and a first bypass hole and a second bypass hole are symmetrically opened on the opposite side walls of the upper part of the barrel, and the first bypass branch pipe and the second bypass branch pipe are connected to the two through holes respectively; the lower part of the barrel is used as a liquid mixing chamber 5, and the inner wall of the bottom end of the barrel is processed into a tapered port 7 with a gradually decreasing inner diameter from top to bottom;

[0024] The upper flange 1 is mounted on and fixed to the top outer wall of the cylinder, and is used to fix the motor driving the screw 3 to rotate; the motor is arranged on the top of the mixer body in a manner that the output shaft is vertically downward; the lower flange 6 is mounted on and fixed to the bottom outer wall of the cylinder, and is used to connect and fix with the test valve of the Christmas tree 17 fixed at the wellhead;

[0025] The screw 3 is centrally arranged in the inner cavity of the mixer body, the top end of which extends to the outside of the mixer body and is connected and fixed to the output shaft of the motor through a coupling, and the bottom end of which is located on the top side of the conical port 7 of the mixer body; the centralizer 2 is mounted and fixed on the upper outer wall of the screw 3, and is a cylindrical disk; wherein the outer diameter of the centralizer 2 is 3 mm smaller than the inner diameter of the mixer body;

[0026] The spiral guide blade 4 is mounted and fixed on the lower outer wall of the screw 3, and its top end is flush with the bottom of the two bypass holes, and its bottom end is flush with the bottom end of the screw 3; wherein the outer diameter of the spiral guide blade 4 is 3 mm smaller than the inner diameter of the mixer body, and the angle between the blade and the axial direction of the screw 3 is 50°;

[0027] The first bypass flange 8 is mounted on and fixed on the outer wall of the pipe end of the first bypass branch pipe, so that the pipe end of the first bypass branch pipe is connected to the outlet end of the first liquid pump 14 through the first bypass flange 8 through a pipeline and forms a connection, so as to transport the polymer solution to the liquid mixing chamber 5; the second bypass flange 9 is mounted on and fixed on the outer wall of the pipe end of the second bypass branch pipe, so that the pipe end of the second bypass branch pipe is connected to the outlet end of the second liquid pump 15 through the second bypass flange 9 through a pipeline and forms a connection, so as to synchronously transport different cross-linking agent solutions to the liquid mixing chamber 5.

[0028] In order to ensure that the polymer solution and the cross-linking agent are fully and evenly mixed in the liquid mixing chamber 5, the inner diameters of the first bypass branch and the second bypass branch are the same, the inner diameter of the mixer body is 1.8 times the inner diameter of the bypass branch, and the axial height of the liquid mixing chamber 5 is 1 / 3 of the inner diameter of the mixer body; the axial length of the tapered port 7 is 1 / 15 times the axial height of the liquid mixing chamber 5, and the inner diameter of the bottom end of the tapered port 7 is 4 / 5 times the inner diameter of the top end.

[0029] The online adjustment and displacement system achieves uniform mixing of polymer mother solution and cross-linking agent solution by using an online adjustment and displacement mixer installed at the wellhead, so that the polymer mother solution and cross-linking agent solution are cross-linked in the wellbore or formation to form a gel, plugging the formation's dominant channel and changing the flow path of the subsequent injected fluid. In the actual downhole construction process, the online adjustment and displacement system not only effectively improves the construction efficiency through simultaneous regulation of multiple well groups, but also reduces costs by more than 30%.

Claims

1. An online drive mixer, characterized in that: The invention comprises a mixer body, a centralizer (2), a screw (3) and a spiral guide blade (4); wherein the mixer body is a vertically arranged cylindrical barrel, and a first bypass hole and a second bypass hole are symmetrically opened on the opposite side walls of the barrel, and the first bypass branch pipe and the second bypass branch pipe are respectively connected to the two through holes, so that the barrel chamber located below the two bypass holes is a liquid mixing chamber (5); the inner wall of the bottom end of the barrel is processed into a tapered port (7) with an inner diameter gradually decreasing from top to bottom; the screw (3) is centrally arranged in the inner cavity of the mixer body, the top end of which extends to the outside of the mixer body and is connected and fixed to the output shaft of the motor through a coupling, and the bottom end of which is located at the tapered port (7) of the mixer body. 7) top side; the centralizer (2) is mounted on and fixed on the upper outer wall of the screw (3); the spiral guide blade (4) is mounted on and fixed on the lower outer wall of the screw (3), and its top end is flush with the bottom of the two bypass holes, and its bottom end is flush with the bottom end of the screw (3); the inner diameter of the first bypass branch pipe and the second bypass branch pipe are the same, the inner diameter of the mixer body is 1.5 to 2 times the inner diameter of the bypass branch pipe, and the axial height of the liquid mixing chamber (5) is 1 / 2 to 1 / 3 of the inner diameter of the mixer body; the axial length of the tapered port (7) is 1 / 10 to 1 / 20 of the axial height of the liquid mixing chamber (5), and the inner diameter of the bottom end of the tapered port (7) is 3 / 5 to 4 / 5 of the inner diameter of the top end.

2. The online adjustment and drive mixer according to claim 1, characterized in that: An upper flange (1) is mounted and fixed on the outer wall of the top end of the cylinder, and a lower flange (6) is mounted and fixed on the outer wall of the bottom end of the cylinder; a first bypass flange (8) is mounted and fixed on the outer wall of the pipe end of the first bypass branch pipe, and a second bypass flange (9) is mounted and fixed on the outer wall of the pipe end of the second bypass branch pipe.

3. The online adjustment and drive mixer according to claim 1, characterized in that: The outer diameter of the spiral guide blade (4) is 2 mm to 5 mm smaller than the inner diameter of the mixer body, and the angle formed between the spiral guide blade (4) and the axial direction of the screw (3) is 45° to 60°.

4. The online adjustment and drive mixer according to claim 1, characterized in that: The outer diameter of the centralizer (2) is 3 mm to 5 mm smaller than the inner diameter of the mixer body.

5. An online control and drive system according to any one of claims 1 to 4, characterized in that: The invention comprises a polymer mixing system (11), a crosslinking agent mixing system, a first liquid pump (14), a second liquid pump (15), an online control and drive mixer (16) and an oil production tree (17); wherein the polymer mixing system (11) comprises at least two polymer mixing tanks, each of which is provided with an agitator; the crosslinking agent mixing system is arranged adjacent to the polymer mixing system (11), and comprises at least two crosslinking agent mixing tanks (13), each of which is provided with an agitator; the outlet end of each polymer mixing tank is simultaneously connected to the inlet end of the first liquid pump (14) through a pipeline and forms a The first bypass branch pipe end is connected to the outlet end of the first liquid pump (14) through a first bypass flange (8) through a pipeline to form a communication; and the second bypass branch pipe end is connected to the outlet end of the second liquid pump (15) through a second bypass flange (9) through a pipeline to form a communication.

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