Pressure flooding injection agent mixing system and using method thereof

Abstract

The invention discloses a pressure flooding injection agent mixing system and a use method thereof, the pressure flooding injection agent mixing system comprises an agent mixing module, and further comprises a terminal control module and an agent flow regulation and control assembly; the medicament flow regulation and control assembly is provided with a medicament inlet and a medicament outlet; the medicament inlet is connected with a medicament barrel through a first pipeline, and the medicament outlet is connected with the medicament mixing module through a second pipeline; the medicament mixing module is connected with the pump machine; and control lines or signal lines of the medicament flow regulation and control assembly and the pump machine are connected with the terminal control module. The agent flow regulation and control assembly can realize accurate regulation and control of the flow of the pressure driving auxiliary agent; the agent mixing module can promote uniform mixing of the auxiliary agent and the stock solution; the terminal control module can carry out real-time control according to the required flow within the effective metering and adjusting range, and the defects of low precision, large hysteresis and the like existing in traditional manual flow adjustment are overcome.

Description

Technical Field

[0001] The invention relates to the technical field of petroleum and natural gas fracturing equipment, in particular to a pressure-driven injection agent mixing system and a use method thereof. Background Art

[0002] Pressure-driven injection is to inject water into wells at a large displacement and high pressure to form micro-cracks, quickly replenish formation energy, and inject chemicals at the same time, and quickly deliver the chemicals to the remaining oil-rich areas through micro-cracks to improve oil recovery efficiency. During pressure-driven injection, it is necessary to mix and transport a variety of injection chemicals. The mixing effect of the mixing device directly affects the quality of the mixed chemicals and the injection effect. With the development of pressure-driven technology, the mixing device is required to be more efficient, fast, simple and convenient to operate, and good in mobility. It is necessary to form a device with a reasonable structure and good economic benefits under the premise of ensuring safety.

[0003] Due to the local differences and discontinuous characteristics of the density and viscosity of the additives during the pressure-driven injection process, the mixing effect of the mixing device will be poor. At the same time, due to the drastic changes in the plunger force during the pressure-driven injection process, the jet speed will be slow and the micro-crack formation effect will be poor. In addition, the additive preparation point used in the pressure-driven injection is far away from the construction site, which will lead to a decrease in the viscosity of the additives during the long-term and long-distance transportation process, resulting in a poor use effect, and even causing the degradation of the additives, resulting in unnecessary waste.

[0004] Publication (announcement) number: CN218047641U, discloses a mixing device for oil-based mud, including a mixing pipe, a curved pipe fixedly connected to the left side of the mixing pipe, a mixing barrel fixedly connected to the bottom end of the curved pipe, a discharge pipe fixedly connected to the top of the curved pipe, a first motor fixedly connected to the top end of the first support plate, a bottom end of the transmission shaft of the first motor sequentially passes through the first support plate and the curved pipe and is fixedly connected to the top end of the central axis of the first spiral stirring paddle, and a blade is fixedly connected to the bottom end of the central axis of the first spiral stirring paddle. In this invention, a plurality of raw materials are firstly injected from the injection hopper at the same time, after being conveyed and stirred by the first spiral stirring paddle and the second spiral stirring paddle, the various costs are fully mixed by the rotation of the blades, which can speed up the mixing speed, and a cleaning agent is injected into the mixing pipe by a submersible pump, which can reduce the labor intensity of the workers.

[0005] The prior art can achieve full mixing after injecting multiple raw materials simultaneously and stirring them with the first and second stage propellers, but does not solve the problem of regulating the flow rate of the mixed liquid.

[0006] Publication (Announcement) No.: CN204252991U discloses a composite fracturing nozzle, which has the characteristics of simple structure, long service life, and convenient disassembly and replacement. It includes a threaded sleeve and a nozzle, one end of the threaded sleeve is provided with an external thread, and the other end is provided with an internal hexagon or an external hexagon. A cavity is provided inside the threaded sleeve, and the nozzle and the internal cavity of the threaded sleeve are tightly matched at a taper of 1:20. The central opening of the internal hexagon or the external hexagon corresponds to the water outlet end of the nozzle, and the interior of the nozzle is designed with a taper of 10° to 11° from the water inlet end to the water outlet end. The composite fracturing nozzle of this patent has the characteristics of simple structure, long service life, and convenient disassembly and replacement through the cooperation of the threaded sleeve and the nozzle.

[0007] This prior art solves the problem of complicated installation and disassembly of the nozzle by matching the threaded sleeve with the nozzle, but has disadvantages such as uneven mixing and inaccurate flow control.

[0008] Publication (announcement) number: CN211562540U, discloses a jet mixer for mixing fracturing fluid; including an intake duct, a swirl nozzle, a mixing tube body, a diffusion cone, a diffusion duct, a cleaning pipeline, a feed joint and a mixing aid cavity, etc.; the intake duct provides clean water to the jet nozzle to form a high-energy rotating water flow and negative pressure, and the flushing pipeline performs secondary mixing of part of the mixed liquid with the powder added at the feed joint. Compared with traditional mixers, the special jet nozzle can form a more efficient rotating jet, and the secondary mixed fracturing fluid has more uniform characteristics, and the water-powder agglomeration phenomenon is completely eliminated; the invention can meet the needs of large-scale fracturing construction, high viscosity ratio and can greatly improve equipment efficiency, reduce the risk of using the mixer, and reduce the cost of oilfield fracturing operations.

[0009] This prior art meets the high viscosity ratio of large-scale fracturing construction and improves the uniformity of the adjuvant mixed reagent, but does not solve the problem of real-time precise control of the variable flow rate of the reagent.

[0010] In summary, the technical solutions of the above-disclosed technologies, the technical problems to be solved, and the beneficial effects produced are all different from the present invention. Regarding more technical features, technical problems to be solved, and beneficial effects of the present invention, the above-disclosed technical documents do not provide any technical inspiration. Summary of the invention

[0011] In view of the above-mentioned defects in the prior art, the purpose of the present invention is to overcome the problems existing in the prior art and propose a pressure-driven injection mixing system and a method of using the same to solve the problems of uneven mixing of additives and difficulty in real-time control of additive flow, thereby improving the pressure-driven injection effect.

[0012] In order to achieve the above object, the present invention adopts the following technical solutions:

[0013] A pressure-driven injection agent mixing system includes an agent mixing module, characterized in that it also includes a terminal control module and an agent flow control assembly;

[0014] The medicine flow control assembly is provided with a medicine inlet and a medicine outlet; the medicine inlet is connected to the medicine barrel through a first pipeline, and the medicine outlet is connected to the medicine mixing module through a second pipeline; the medicine mixing module is connected to the pump;

[0015] The control line or signal line of the medicine flow control assembly and the pump is connected to the terminal control module.

[0016] The medicine flow control assembly includes a pressure sensor, an electromagnetic flow meter, and a flow control module;

[0017] The pressure sensor is connected to the medicine inlet; the electromagnetic flowmeter is connected to the medicine outlet;

[0018] A flow control module is provided between the pressure sensor and the electromagnetic flowmeter;

[0019] At least two regulating pipelines are arranged in the flow control module, and each regulating pipeline is provided with a metering pump and a check valve.

[0020] The control lines or signal lines of the pump, pressure sensor, electromagnetic flowmeter, metering pump, and check valve are connected to the terminal control module.

[0021] The pump is a variable frequency pump with a speed adjustment range of 1-3000r; the metering accuracy of the metering pump is 10-15ML / r.

[0022] In one embodiment of the present invention, three regulating pipelines are arranged in the flow control module, which are divided into a first regulating pipeline, a second regulating pipeline, and a third regulating pipeline; a first metering pump and a first check valve are arranged in the first regulating pipeline; a second metering pump and a second check valve are arranged in the second regulating pipeline; and a third metering pump and a third check valve are arranged in the third regulating pipeline.

[0023] The medicine mixing module is composed of a nozzle, a mixing tube, a throat and a diffusion tube;

[0024] A mixing chamber is provided in the mixing tube, and a medicine suction port is provided on the side wall of the mixing chamber;

[0025] The mixing tube is connected to a nozzle at the axial rear end, the nozzle is inserted into the mixing chamber, and the front end of the nozzle is in front of the medicine inhalation port;

[0026] The axial front end of the mixing tube is connected to the throat, and the axial front end of the throat is connected to the diffusion tube.

[0027] The axial front end of the diffusion tube is the outlet end of the mixed medicine, which is used to connect to the next stage device;

[0028] The axial rear end of the nozzle is a clean water inlet, the clean water inlet is connected to a water inlet pipe, and the water inlet pipe is connected to a pump;

[0029] The medicine suction port is connected to the second pipeline.

[0030] The front end of the nozzle and the front end of the inner wall of the mixing tube are both inwardly converging cones; the inner diameter of the diffusion tube gradually increases from front to back.

[0031] A first sealing ring is provided between the nozzle and the mixing tube for sealing;

[0032] The throat pipe and the mixing pipe are sealed by a second sealing ring; the throat pipe and the diffusion pipe are sealed by a third sealing ring.

[0033] A method for using a pressure-driven injection mixing system comprises the following steps:

[0034] S1, connecting device, connect the first pipeline of the agent inlet of the agent control module to the agent barrel, connect the second pipeline of the agent outlet to the agent inlet of the agent mixing module; connect the clean water inlet of the agent mixing module to the water outlet of the pump; set the pressure-driven auxiliary agent flow target value to 0.015-120L / min through the terminal control module;

[0035] S2, start the device, the pump pumps clean water into the mixing chamber through the nozzle, the clean water flows through the mixing chamber to generate negative pressure, the agent enters the mixing chamber from the drug suction port through the agent control module, the mixed agent diffuses in the diffuser after passing through the throat, the speed is reduced and the pressure is increased, and then goes to the next device;

[0036] S3, dynamic adjustment, the terminal control module controls the pump speed and the number of ways to open the check valve in the flow control module by receiving the detection data of the pressure sensor, electromagnetic flowmeter and metering pump, forming a closed-loop control, so that the detection value of the electromagnetic flowmeter fits the target value of the pressure-driven auxiliary agent flow;

[0037] S4, pressure drive, mixed reagents are sprayed out by the next level injection device, and high pressure injection is carried out on the well wall to create micro cracks, so as to achieve the effects of reducing pressure and increasing injection, oil displacement, anti-swelling, and temporary plugging of high permeability oil layers.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1. The reagent flow control assembly can realize the precise control of the pressure-driven auxiliary agent flow. The three-way metering pump is driven separately to reduce the error of the traditional large pump in the small flow output and can serve as a backup for each other when one of the lines fails, ensuring the continuous process of the auxiliary agent mixing;

[0040] 2. The reagent mixing module can obtain a higher injection speed through the nozzle and mixing tube at a lower input speed, which can stimulate the turbulent state of the liquid and better promote the uniform mixing of the additive and the stock solution;

[0041] 3. The structure of the reagent mixing module protects the nozzle. The central axis of the nozzle and the mixing tube coincide, so that the nozzle is subjected to balanced force during the injection process, ensuring the reliability of the injection.

[0042] 4. The terminal control module receives feedback on data such as clean water flow, chemical flow, chemical concentration of mixed chemicals, pipeline pressure, etc. and records them in real time. It can perform real-time control according to the required flow within the effective metering and adjustment range, avoiding the defects of low precision and large lag in traditional manual flow adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a structural schematic diagram of a pressure-driven injection mixing system of the present invention;

[0044] Figure 2 It is a structural schematic diagram of a medicine mixing module of a pressure-driven injection mixing system of the present invention;

[0045] Figure 3 It is a structural schematic diagram of a medicine control module of a pressure-driven injection mixing system of the present invention;

[0046] In the figure: 1. terminal control module; 2. medicine mixing module; 3. medicine flow control assembly; 201. nozzle; 202. mixing tube; 203. throat; 204. diffusion tube; 205a. first sealing ring; 205b. second sealing ring; 205c. third sealing ring; 206. medicine suction port; 301. pressure sensor; 302a. first metering pump; 302b. second metering pump; 302c. third metering pump; 303a. first check valve; 303b. second check valve; 303c. third check valve; 304. electromagnetic flow meter. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] See also Figures 1 to 3 The present invention provides a pressure-driven injection agent mixing system and a method of using the same, comprising a terminal control module 1, an agent mixing module 2, and an agent flow control assembly 3;

[0049] The medicine flow control assembly 3 is provided with a medicine inlet and a medicine outlet; the medicine inlet is connected to the medicine barrel through a first pipeline, and the medicine outlet is connected to the medicine mixing module 2 through a second pipeline;

[0050] The medicine flow control assembly 3 is provided with a pressure sensor 301, an electromagnetic flow meter 304, a metering pump, and a check valve;

[0051] The pressure sensor 301 is connected to the medicine inlet to record the input pressure of the first pipeline, and the electromagnetic flowmeter 304 is connected to the medicine outlet; a flow control module is arranged between the pressure sensor 301 and the electromagnetic flowmeter 304, and at least two regulating pipelines are arranged in the flow control module, and each regulating pipeline is provided with a metering pump and a check valve.

[0052] The medicine mixing module is composed of a nozzle 201, a mixing tube 202, a throat 203, and a diffusion tube 204;

[0053] The mixing tube 202 is provided with a mixing chamber, and the side wall of the mixing chamber is provided with a medicine suction port 206; the axial rear end of the mixing tube 202 is connected to the nozzle 201, and the nozzle 201 is inserted into the mixing chamber, and the front end of the nozzle 201 is in front of the medicine suction port 206. The front end of the nozzle 201 and the front end of the inner wall of the mixing tube 202 are both inwardly converging cones, and a first sealing ring 205a is provided between the nozzle 201 and the mixing tube 202 for sealing;

[0054] The axial rear end of the nozzle 201 is a clean water inlet, which is connected to the water inlet pipe of the pump;

[0055] The medicine inhalation port 206 is connected to the second pipeline.

[0056] The axial front end of the mixing tube 202 is connected to the throat 203 , and the throat 203 and the mixing tube 202 are sealed by a second sealing ring 205 b .

[0057] The axial front end of the throat pipe 203 is connected to the diffuser pipe 204, the inner diameter of the diffuser pipe 204 gradually increases from front to back, and the throat pipe 203 and the diffuser pipe 204 are sealed by a third sealing ring 205c;

[0058] The axial front end of the diffusion tube 204 is the outlet end of the mixed medicine, which is used to connect to the next stage device;

[0059] The control lines or signal lines of the pump, the pressure sensor 301, the electromagnetic flowmeter 304, the metering pump, and the check valve are connected to the terminal control module.

[0060] The pump is a variable frequency pump with a speed adjustment range of 1-3000r.

[0061] The metering accuracy of the metering pump is 10-15ML / r.

[0062] It should be noted that the terminal control module can be a programmable intelligent control device such as a PLC, a single-chip microcomputer, a computer, etc., which can be purchased and used from the market, and those skilled in the art are clear about this.

[0063] How to use this system:

[0064] S1, connecting device, connect the first pipeline of the agent inlet of the agent control module 3 to the agent barrel, connect the second pipeline of the agent outlet to the agent inlet of the agent mixing module 2; connect the clean water inlet of the agent mixing module to the water outlet of the pump; set the pressure-driven auxiliary agent flow target value to 0.015L / min through the terminal control module;

[0065] S2, start the device, the pump pumps clean water into the mixing chamber through the nozzle 201, the clean water flows through the mixing chamber to generate negative pressure, the medicine enters the mixing chamber from the medicine suction port 206 through the medicine control module 3, the mixed medicine diffuses in the diffusion pipe 204 after passing through the throat 203, the speed is reduced and the pressure is increased, and then goes to the next device;

[0066] S3, dynamic adjustment, the terminal control module controls the pump speed and the number of check valves opened in the flow control module by receiving the detection data of the pressure sensor 301, the electromagnetic flowmeter 304 and the metering pump, forming a closed-loop control so that the detection value of the electromagnetic flowmeter 304 fits the target value of the pressure-driven auxiliary agent flow.

[0067] S4, pressure drive, mixed reagents are sprayed out by the next level injection device, and high pressure injection is performed on the well wall to create micro cracks. By adding different injection agents into the reagent barrel, the pressure reduction, injection increase, oil displacement and anti-swelling effects are achieved, and the high permeability oil layer is temporarily blocked.

[0068] Embodiment 2:

[0069] Based on Example 1, the flow control module is provided with three regulating pipelines, which are divided into a first regulating pipeline, a second regulating pipeline, and a third regulating pipeline;

[0070] The first regulating pipeline is provided with a first metering pump 302a and a first check valve 303a; the second regulating pipeline is provided with a second metering pump 302b and a second check valve 303b; the third regulating pipeline is provided with a third metering pump 302c and a third check valve 303c.

[0071] Depending on the target flow requirements, the three routes can be operated simultaneously or only one or two routes can be opened for operation; when one route fails, the other two routes can be temporarily used as standby.

[0072] Embodiment 3:

[0073] Based on Example 1, step S1 is adjusted to:

[0074] S1, connecting device, connect the first pipeline of the agent inlet of the agent control module 3 to the agent barrel, connect the second pipeline of the agent outlet to the agent inlet of the agent mixing module 2; connect the clean water inlet of the agent mixing module to the water outlet of the pump; set the target value of the pressure-driven auxiliary agent flow rate to 120L / min through the terminal control module;

[0075] All components and connection methods of components not discussed in this application belong to the known technologies in this technical field and can be directly applied without further explanation.

[0076] In the present invention, the term "plurality" refers to two or more than two, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0077] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0078] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressure-driven injection mixing system, comprising a medicine mixing module, characterized in that: It also includes a terminal control module and a medicine flow control assembly; The medicine flow control assembly is provided with a medicine inlet and a medicine outlet; the medicine inlet is connected to the medicine barrel through a first pipeline, and the medicine outlet is connected to the medicine mixing module through a second pipeline; the medicine mixing module is connected to the pump; The control line or signal line of the medicine flow control assembly and the pump is connected to the terminal control module.

2. A pressure-driven injection agent mixing system according to claim 1, characterized in that: The medicine flow control assembly includes a pressure sensor, an electromagnetic flow meter, and a flow control module; The pressure sensor is connected to the medicine inlet; the electromagnetic flowmeter is connected to the medicine outlet; A flow control module is provided between the pressure sensor and the electromagnetic flowmeter; At least two regulating pipelines are arranged in the flow control module, and each regulating pipeline is provided with a metering pump and a check valve.

3. A pressure-driven injection agent mixing system according to claim 2, characterized in that: The control lines or signal lines of the pump, pressure sensor, electromagnetic flowmeter, metering pump, and check valve are connected to the terminal control module.

4. A pressure-driven injection agent mixing system according to claim 2, characterized in that: The pump is a variable frequency pump with a speed adjustment range of 1-3000r; the metering accuracy of the metering pump is 10-15ML / r.

5. A pressure-driven injection agent mixing system according to claim 2, characterized in that: The flow control module is provided with three regulating pipelines, which are divided into a first regulating pipeline, a second regulating pipeline, and a third regulating pipeline; The first regulating pipeline is provided with a first metering pump and a first check valve; The second regulating pipeline is provided with a second metering pump and a second check valve; The third regulating pipeline is provided with a third metering pump and a third check valve.

6. A pressure-driven injection agent mixing system according to claim 2, characterized in that: The medicine mixing module is composed of a nozzle, a mixing tube, a throat and a diffusion tube; A mixing chamber is provided in the mixing tube, and a medicine suction port is provided on the side wall of the mixing chamber; The mixing tube is connected to a nozzle at the axial rear end, the nozzle is inserted into the mixing chamber, and the front end of the nozzle is in front of the medicine inhalation port; The axial front end of the mixing tube is connected to the throat, and the axial front end of the throat is connected to the diffusion tube.

7. A pressure-driven injection agent mixing system according to claim 6, characterized in that: The axial front end of the diffusion tube is the outlet end of the mixed medicine, which is used to connect to the next stage device; The axial rear end of the nozzle is a clean water inlet, the clean water inlet is connected to a water inlet pipe, and the water inlet pipe is connected to a pump; The medicine suction port is connected to the second pipeline.

8. A pressure-driven injection agent mixing system according to claim 6, characterized in that: The front end of the nozzle and the front end of the inner wall of the mixing tube are both inwardly converging cones; the inner diameter of the diffusion tube gradually increases from front to back.

9. A pressure-driven injection agent mixing system according to claim 6, characterized in that: A first sealing ring is provided between the nozzle and the mixing tube for sealing; The throat pipe and the mixing pipe are sealed by a second sealing ring; the throat pipe and the diffusion pipe are sealed by a third sealing ring.

10. A method for using a pressure-driven injection mixing system, characterized in that: The following steps are included: S1, connecting device, connecting the first pipeline of the agent inlet of the agent control module to the agent barrel, connecting the second pipeline of the agent outlet to the agent inlet of the agent mixing module; connecting the clean water inlet of the agent mixing module to the water outlet of the pump; setting the target value of the pressure-driven auxiliary agent flow rate through the terminal control module; S2, start the device, the pump pumps clean water into the mixing chamber through the nozzle, the clean water flows through the mixing chamber to generate negative pressure, the agent enters the mixing chamber from the drug suction port through the agent control module, the mixed agent diffuses in the diffuser after passing through the throat, the speed is reduced and the pressure is increased, and then goes to the next device; S3, dynamic adjustment, the terminal control module controls the pump speed and the number of ways to open the check valve in the flow control module by receiving the detection data of the pressure sensor, electromagnetic flowmeter and metering pump, forming a closed-loop control, so that the detection value of the electromagnetic flowmeter fits the target value of the pressure-driven auxiliary agent flow; S4, pressure drive, mixed reagents are sprayed out by the next level injection device, and high pressure injection is carried out on the well wall to create micro cracks, so as to achieve the effects of reducing pressure and increasing injection, oil displacement, anti-swelling, and temporary plugging of high permeability oil layers.

11. The method for using a pressure-driven injection agent mixing system according to claim 10, characterized in that: The target flow rate of the pressure-driven auxiliary agent is 0.015-120 L / min.

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