Automatic fracturing medicine adding system and medicine adding method

Abstract

The invention discloses a fracturing drug adding system which comprises a mixing tank, a feeding port of the mixing tank is connected with a dry powder conveying system and a liquid conveying system, a discharging port of the mixing tank is connected to a discharging main pipe through a discharging pump, the dry powder conveying system is connected to a suction main pipe through a suction pump, and the suction pump is further connected with the mixing tank. And the liquid conveying system is also connected with the discharge header pipe. The invention further discloses a dosing method using the system, the powder received by the dry powder conveying system is premixed and then secondarily mixed with the liquid received by the liquid conveying system in the mixing tank, so that the powder and the liquid are mixed more uniformly, and the system provides more types of medicine adding channels and larger medicine reserves, so that the dosing efficiency is improved. And the requirements of large-scale fracturing operation can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil and gas well fracturing equipment, specifically relates to an automatic fracturing chemical adding system, and the present invention also relates to a chemical adding method using this system. Background Art

[0002] Downhole fracturing in oil wells is an important technical means to improve oilfield exploitation efficiency. By performing fracturing operations on the oilfield downhole, the oil well output can be effectively increased, the oilfield production cycle can be extended, and the oil and gas collection efficiency can be improved. When performing fracturing operations, a reasonable fracturing plan needs to be designed according to the situation, and suitable fracturing chemicals need to be added to the fracturing fluid to ensure safe and efficient operation.

[0003] In current fracturing processes, chemical addition is mainly divided into two categories: dry powder additives and liquid additives, which are mainly used to improve the performance of the fracturing fluid, such as improving the thickening and drag reduction characteristics of the fracturing fluid. Currently, dry powder addition is mainly achieved by manually unpacking bagged dry powder and putting it into a dry powder tank, and then transporting it to the mixing tank of the sand mixing equipment through a screw conveyor; liquid addition is achieved by using a liquid addition pump group, passing through a liquid addition tank and pipelines, and manually controlling the opening and closing of the ball valve to add or stop the liquid.

[0004] Currently, whether it is dry powder or liquid addition, there are problems such as low efficiency of manual operation, insufficient chemical addition displacement to cope with large-scale fracturing operations, and uneven mixing of chemicals added manually by personnel. Moreover, when adding powder, due to manual bag unpacking, there is a heavy dust in the working space, which poses a serious threat to the health of operators. Therefore, there is an urgent need for an automatic chemical adding system with more uniform chemical mixing, more types of liquid additives, and larger liquid additive reserves. Summary of the Invention

[0005] The purpose of the present invention is to provide an automatic fracturing chemical adding system, which can automatically break the bags of dry powder chemicals added, mix them evenly, and can automatically transport various liquid chemicals, increasing the types and reserves of chemical additives to meet the displacement and type requirements for large-scale fracturing operations.

[0006] Another purpose of the present invention is to provide a fracturing chemical adding method.

[0007] The technical solution adopted by the present invention is that the automatic fracturing chemical adding system includes a mixing tank. The inlet of the mixing tank is respectively connected to a dry powder conveying system and a liquid conveying system. The outlet of the mixing tank is connected to a discharge main pipe through a discharge pump. The dry powder conveying system is connected to a suction main pipe through a suction pump, and the suction pump is also connected to the mixing tank. The liquid conveying system is also connected to the discharge main pipe.

[0008] The characteristics of the present invention also lie in:

[0009] The dry powder conveying system includes a dry powder tank, a bag breaker is arranged inside the dry powder tank, the dry powder tank is connected to a double-screw sand conveyor, the double-screw sand conveyor is connected to the inlet of a constant-pressure mixer, the constant-pressure mixer is also provided with a second inlet, and the second inlet is connected to a suction pump through an injection pump, and the outlet of the constant-pressure mixer is connected to a mixing tank.

[0010] A pressure regulating device is arranged inside the constant-pressure mixer.

[0011] The liquid conveying system includes multiple parallel conveying pipelines, each conveying pipeline is provided with a conveying pump and a flow meter, a quick-connect connector is arranged at the inlet of the conveying pipeline, the outlet of the conveying pipeline is divided into two paths, one path is connected to the mixing tank, and the other path is connected to the discharge main pipe.

[0012] A liquid addition tank and an electric butterfly valve are arranged in the conveying pipeline.

[0013] A stirrer is arranged at the top inside the mixing tank, the stirrer includes stirring blades, a stirring shaft and a connecting bushing, and the stirrer is driven by a driving motor.

[0014] The suction end of the suction pump is connected to the suction main pipe, and the output end of the suction pump is respectively connected to the injection pump and the mixing tank.

[0015] A control manifold is arranged in the pipeline for connection.

[0016] Another technical solution adopted by the present invention is a fracturing chemical dosing method, which is specifically carried out according to the following steps:

[0017] Step 1: The dry powder conveying system receives the powder required in the fracturing agent formula, and the liquid conveying system receives the liquid agent required in the fracturing agent formula;

[0018] Step 2: Start the suction pump to suck clear water for mixing from the outside through the suction main pipe, send a part of the clear water to the dry powder conveying system for pre-mixing with the powder, and send the remaining clear water into the mixing tank;

[0019] Step 3: After the pre-mixing is completed, when the powder and the liquid agent need to be mixed and used, convey the liquid agent sucked in the liquid conveying system and the pre-mixed powder to the mixing tank, perform secondary mixing with the clear water, and then convey the mixed liquid to the discharge main pipe through a discharge pump.

[0020] When the powder and the liquid agent do not need to be mixed and used, convey the pre-mixed powder to the mixing tank, perform secondary mixing with the clear water, and then convey the mixed liquid to the discharge main pipe through a discharge pump, and directly convey the liquid agent in the liquid conveying system to the discharge main pipe.

[0021] The beneficial effects of the present invention are as follows: The automatic fracturing chemical addition system provided by the present invention is provided with a dry powder conveying system, a liquid conveying system and a mixing tank. A part of the liquid inhaled by the suction pump generates negative pressure to suck the powder into the dry powder conveying system for pre-mixing, and then the pre-mixed powder and liquid agent are secondarily mixed in the mixing tank, making the chemical mixing more uniform. The liquid conveying system is provided with multiple conveying pipelines, a liquid addition tank and an electric butterfly valve, which can store and switch various liquid agents, increasing the liquid addition storage capacity and also adapting to the situation of adding various types of liquid agents to meet the requirements during large-scale fracturing operations. In addition, the control manifold provided in the system can control and switch between each conveying pipeline, so as to realize flexible control of the required chemicals and dosages, uniform mixing, automatic conveying and automatic addition. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the automatic fracturing chemical addition system of the present invention;

[0023] Figure 2 is a schematic structural diagram of the constant pressure mixer in the system of the present invention.

[0024] In the figure, 1. suction pump, 2. discharge pump, 3. discharge main pipe,

[0025] 4. dry powder conveying system, 401. dry powder tank, 402. double spiral sand conveyor, 403. constant pressure mixer, 404. jet pump, 405. bag breaker, 406. pressure regulating device,

[0026] 5. liquid conveying system, 501. conveying pump, 502. liquid addition tank, 503. electric butterfly valve, 504. flowmeter, 6. mixing tank, 7. suction main pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] The structure of the system of the present invention is as Figure 1As shown in the figure, it includes a mixing tank 6. The inlet of the mixing tank 6 is respectively connected to a dry powder conveying system 4 and a liquid conveying system 5. The dry powder conveying system 4 is mainly used for storing powder agents and pre-mixing and conveying the powder agents. The liquid conveying system 5 is used for storing and conveying liquid agents. The mixing tank 6 can re-mix the pre-mixed powder and liquid evenly in the mixing tank 6. The outlet of the mixing tank 6 is connected to the discharge main pipe 3 through a discharge pump 2. The prepared fracturing agent can be pumped and conveyed to the discharge main pipe 3 through the discharge pump 2, and the discharge main pipe 3 controls the discharge for use in fracturing operations. The dry powder conveying system 4 is connected to the suction main pipe 7 through a suction pump 1. The suction pump 1 is also connected to the mixing tank 6. The clear water required for pre-mixing is introduced from the suction main pipe 7 through the suction pump 1. Part of it is conveyed to the dry powder conveying system 4 for pre-mixing, and part of it is conveyed to the mixing tank 6 for secondary mixing. The liquid conveying system 5 is also connected to the discharge main pipe 3. Sometimes when the liquid agent only needs to be used alone or does not need to be mixed with the powder, the liquid agent can be directly conveyed to the discharge main pipe 3, simplifying the conveying process and improving the construction efficiency.

[0029] The above dry powder conveying system 4 includes a dry powder tank 401. A bag breaker 405 is arranged in the dry powder tank 401, and the required powder can be directly put into the dry powder tank 401. The bag breaker 405 can automatically break the bag of the powder material and store it. The dry powder tank 401 is connected to a double-screw sand conveyor 402, and the double-screw sand conveyor 402 is connected to the inlet of a constant-pressure mixer 403. When mixing, the powder material reaches the powder inlet of the constant-pressure mixer 403 through the double-screw sand conveyor 402. The conveying amount of the powder material can be controlled by the rotation speed of the control motor in the double-screw sand conveyor 402. The constant-pressure mixer 403 also has a second inlet, and the second inlet is connected to the suction pump 1 through a jet pump 404. The inhaled clear water can be ejected to form a high-speed jet flow to create a negative pressure in the constant-pressure mixer 403 and inhale the dry powder for pre-mixing. As Figure 2 shown, a pressure regulating device 406 is arranged in the constant-pressure mixer 403, which can adjust the pressure in the constant-pressure mixer 403 to ensure that the constant-pressure mixer 403 is in a constant-pressure state during operation, making the powder inhalation more uniform. The outlet of the constant-pressure mixer 403 is connected to the mixing tank 6, and the powder and liquid continue to be mixed in the mixing tank 6 after pre-mixing, making the mixing more thorough and uniform.

[0030] Specifically, the above-mentioned liquid delivery system 5 includes multiple parallel delivery pipelines. Each delivery pipeline is provided with a delivery pump 501, a liquid addition tank 502, a flow meter 504, and an electric butterfly valve 503. A quick-connect connector is set at the inlet of the delivery pipeline, through which liquid medicine can be received and stored in the liquid addition tank 502, and it can be self-transported through the height difference or pumped by the delivery pump 501. The delivery volume is measured by the flow meter 504. Each delivery pipeline can be independently controlled, and the switching of the control circuit is controlled by the electric butterfly valve 503. The outlet of each delivery pipeline is divided into two paths. One path is connected to the inlet of the mixing tank 6, and the other path is connected to the discharge main pipe 3. When the liquid agent needs to be mixed with the powder agent, it is transported to the mixing tank 6 through the pipeline for secondary mixing. When only the liquid agent is needed for operation, the liquid agent can be directly transported to the discharge main pipe 3, simplifying the delivery process.

[0031] In the above system, a stirrer is arranged at the top inside the mixing tank 6. The stirrer includes a stirring paddle, a stirring shaft, and a connecting bushing, and is driven by a driving motor for rapid and uniform secondary mixing of the mixed liquid to improve the mixing quality. The outlet of the mixing tank 6 is connected to the inlet of the discharge pump 2, and the mixed medicine can be pumped out. The suction end of the suction pump 1 is connected to the suction main pipe 7. The output end of the suction pump 1 is divided into two paths. One path is connected to the inlet of the jet pump 404 to provide the liquid flow required by the jet pump 404, and the other path is connected to the inlet of the mixing tank 6 to introduce part of the clear water into the tank to assist in secondary mixing. The outlet of the discharge pump 2 is connected to the discharge main pipe 3. In addition, several groups of control manifolds are also arranged in the connecting pipelines of the above system. The control manifolds can be composed of flow meters, electric butterfly valves, and pressure sensors, and are used to control the shutdown, opening, switching, flow measurement, and pressure monitoring of the pipelines, etc., to ensure the stable operation of the system.

[0032] When the automatic fracturing drug addition system provided by the present invention is in operation, the suction pump 1 first sucks in liquid from the outside through the suction main pipe 7, and then discharges it in two paths. One path is directly transported to the mixing tank 6, and the other path is connected to the jet pump 404 to provide the liquid flow required by the jet pump 404. At the same time, the dry powder tank 401 can receive powder drugs, and the automatic bag breaking is carried out by the bag breaker 405. The powder is transported to the powder inlet of the constant pressure mixer 403 through the double helix sand transporter 402. The high-speed jet flow ejected by the jet pump 404 forms a negative pressure in the constant pressure mixer 403, and the dry powder is sucked in through the negative pressure for pre-mixing. The pressure is adjusted by the pressure regulating device 406 to ensure the constant pressure in the constant pressure mixer 403. The pre-mixed powder-liquid is introduced into the mixing tank 6. On the other hand, the liquid delivery system 5 can receive liquid drugs through the quick-connect connector, store and transport various liquid drugs separately, and transport the required liquid drugs to the mixing tank 6 through the switching control of the electric butterfly valve 503 for secondary mixing with the pre-mixed powder-liquid. The final mixed drug is pumped out by the discharge pump 2 and transported to the discharge main pipe 3 for discharge for operation use.

[0033] Through the system provided by the present invention, during the fracturing construction, the automatic bag breaking of dry powder agents during the preparation of fracturing fluid is realized, and through negative pressure suction, pre-mixing is carried out, and then secondary mixing with liquid agents is carried out to achieve a more uniform mixing effect. In addition, more types of liquid additives and a larger solid-liquid storage capacity are provided, meeting the requirements during large-scale fracturing operations.

[0034] The present invention also provides a method for adding fracturing drugs using the above system. The method is specifically carried out according to the following steps:

[0035] Step 1: The dry powder delivery system 4 receives the required powder in the fracturing agent formula, and the liquid delivery system 5 receives the required liquid agent in the fracturing agent formula;

[0036] Step 2: Start the suction pump 1 to suck clear water for mixing from the outside through the suction main pipe 7, send a part of the clear water to the dry powder delivery system 4 for pre-mixing with the powder, and the remaining clear water is fed into the mixing tank 6;

[0037] Step 3: After the pre-mixing is completed, when the powder and the liquid agent need to be mixed for use, the liquid agent sucked in the liquid delivery system 5 and the pre-mixed powder are sent to the mixing tank 6 for secondary mixing with the clear water, and then the mixed liquid is sent to the discharge main pipe 3 through the discharge pump 2.

[0038] When the powder and the liquid agent do not need to be mixed for use, the pre-mixed powder is sent to the mixing tank 6 for secondary mixing with the clear water, and then the mixed liquid is sent to the discharge main pipe 3 through the discharge pump 2, and the liquid agent in the liquid delivery system 5 is directly sent to the discharge main pipe 3.

[0039] Example 1

[0040] The automatic fracturing drug adding system provided in this Example 1 includes a mixing tank 6. The inlet of the mixing tank 6 is respectively connected to a dry powder delivery system 4 and a liquid delivery system 5. The outlet of the mixing tank 6 is connected to the discharge main pipe 3 through a discharge pump 2. The dry powder delivery system 4 is connected to the suction main pipe 7 through a suction pump 1. The suction pump 1 is also connected to the mixing tank 6. The liquid delivery system 5 is also connected to the discharge main pipe 3. Among them, the dry powder delivery system 4 specifically includes a dry powder tank 401. A bag breaker 405 is arranged in the dry powder tank 401. The dry powder tank 401 is connected to a double-screw sand conveyor 402. The double-screw sand conveyor 402 is connected to the inlet of a constant-pressure mixer 403. The constant-pressure mixer 403 also has a second inlet, and the second inlet is connected to the suction pump 1 through a jet pump 404. A pressure regulating device 406 is arranged in the constant-pressure mixer 403. The outlet of the constant-pressure mixer 403 is connected to the mixing tank 6. A control manifold is arranged in the connecting pipeline of the above system.

[0041] The system provided by Embodiment 1 can automatically break the bags of the powder in the dry powder tank 401, and then send it into the constant pressure mixer 403 through the double - helix sand conveyor 402 for pre - mixing. The pre - mixed powder and the liquid agent of the liquid delivery system 5 are secondarily mixed in the mixing tank to achieve a more uniform mixing effect.

[0042] Embodiment 2

[0043] The automatic fracturing drug adding system provided by Embodiment 2 includes a mixing tank 6. The inlet of the mixing tank 6 is respectively connected to a dry powder delivery system 4 and a liquid delivery system 5. The outlet of the mixing tank 6 is connected to the discharge main pipe 3 through a discharge pump 2. The dry powder delivery system 4 is connected to the suction main pipe 7 through a suction pump 1. The suction pump 1 is also connected to the mixing tank 6. The liquid delivery system 5 is also connected to the discharge main pipe 3. Among them, the dry powder delivery system 4 specifically includes a dry powder tank 401. A bag - breaking device 405 is arranged in the dry powder tank 401. The dry powder tank 401 is connected to a double - helix sand conveyor 402. The double - helix sand conveyor 402 is connected to the inlet of a constant pressure mixer 403. The constant pressure mixer 403 also has a second inlet, and the second inlet is connected to the suction pump 1 through a jet pump 404. A pressure regulating device 406 is arranged in the constant pressure mixer 403. The outlet of the constant pressure mixer 403 is connected to the mixing tank 6. The liquid delivery system 5 includes multiple parallel delivery pipelines. Each delivery pipeline is provided with a delivery pump and a flowmeter. A liquid addition tank 502 and an electric butterfly valve 503 are also arranged in the delivery pipeline. A quick - connect connector is arranged at the inlet of each delivery pipeline. The outlet of the delivery pipeline is divided into two paths. One path is connected to the inlet of the mixing tank 6, and the other path is connected to the discharge main pipe 3. A control manifold is also arranged in the pipeline.

[0044] In the system provided by Embodiment 2, the liquid delivery system 5 is designed as multiple parallel delivery pipelines, and the output port is divided into two paths, which are respectively connected to the mixing tank 6 and the discharge main pipe 3. On the one hand, it can provide the addition and switching of various liquid agents to meet flexible construction requirements. On the other hand, when using only liquid agent for fracturing or without mixing with powder, the liquid agent can be directly transported to the discharge main pipe for operation use, simplifying the transportation process, improving construction efficiency, and a liquid addition tank 502 is arranged in the delivery pipeline, which can increase the liquid storage capacity and utilize the self - transportation by the height difference, saving resources.

[0045] Embodiment 3

[0046] The fracturing drug adding method provided by Embodiment 3 uses the automatic fracturing drug adding system provided by the present invention and is carried out according to the following steps:

[0047] Step 1: The powder required in the fracturing agent formula is received at the dry powder tank 401, and the liquid agent required in the fracturing agent formula is received by the liquid delivery system 5 through the quick - connect connector.

[0048] Step 2: Turn on the suction pump 1 to suck clear water for mixing from the outside through the suction main pipe 7. A part of the clear water is ejected as a high-speed jet through the jet pump 404 to form a negative pressure in the constant-pressure mixer 403, sucking the powder in the powder tank 401 for premixing, and the remaining clear water is directly fed into the mixing tank 6;

[0049] Step 3: After the premixing is completed, the liquid agent received by the liquid delivery system 5 and the premixed powder are delivered to the mixing tank 6 for secondary mixing with the clear water to mix evenly, and then the mixed liquid after the secondary mixing is delivered to the discharge main pipe 3 through the discharge pump 2 for use in the fracturing operation.

Claims

1. Automatic fracturing chemical adding system, Characterized in that, It includes a mixing tank (6), the inlet of the mixing tank (6) is respectively connected to a dry powder conveying system (4) and a liquid conveying system (5), the outlet of the mixing tank (6) is connected to a discharge main pipe (3) through a discharge pump (2), the dry powder conveying system (4) is connected to a suction main pipe (7) through a suction pump (1), the suction pump (1) is also connected to the mixing tank (6), and the liquid conveying system (5) is also connected to the discharge main pipe (3).

2. The automatic fracturing chemical adding system according to claim 1, Characterized in that, The dry powder conveying system (4) includes a dry powder tank (401), a bag breaker (405) is arranged in the dry powder tank (401), the dry powder tank (401) is connected to a double - helix sand transporter (402), the double - helix sand transporter (402) is connected to the inlet of a constant - pressure mixer (403), the constant - pressure mixer (403) also has a second inlet, the second inlet is connected to the suction pump (1) through an injection pump (404), and the outlet of the constant - pressure mixer (403) is connected to the mixing tank (6).

3. The automatic fracturing chemical adding system according to claim 2, Characterized in that, A pressure regulating device (406) is arranged in the constant - pressure mixer (403).

4. The automatic fracturing chemical adding system according to claim 3, Characterized in that, The liquid conveying system (5) includes multiple parallel conveying pipelines, each conveying pipeline is provided with a conveying pump (501) and a flowmeter (504), the inlet of the conveying pipeline is provided with a quick - connect connector, the outlet of the conveying pipeline is divided into two paths, one path is connected to the mixing tank (6), and the other path is connected to the discharge main pipe (3).

5. The automatic fracturing chemical adding system according to claim 4, Characterized in that, A liquid addition tank (502) and an electric butterfly valve (503) are arranged in the conveying pipeline.

6. The automatic fracturing chemical adding system according to claim 5, Characterized in that, A stirrer is arranged at the top inside the mixing tank (6), the stirrer includes stirring blades, a stirring shaft and a connecting bushing, and the stirrer is driven by a driving motor.

7. The automatic fracturing chemical adding system according to claim 6, Characterized in that, The suction end of the suction pump (1) is connected to the suction main pipe (7), and the output end of the suction pump (1) is respectively connected to the injection pump (404) and the mixing tank (6).

8. The automatic fracturing chemical adding system according to any one of claims 1 - 7, Characterized in that, A control manifold is arranged in the pipeline for connection.

9. Fracturing chemical adding method, Characterized in that, Using any one of the automatic fracturing chemical adding systems in claims 1 - 8, and proceeding according to the following steps: Step 1: The dry powder conveying system (4) receives the powder required in the fracturing chemical formula, and the liquid conveying system (5) receives the liquid agent required in the fracturing chemical formula; Step 2: Turn on the suction pump (1) to suck clear water for mixing from the outside through the suction main pipe (7), deliver a part of the clear water to the dry powder delivery system (4) for pre-mixing with the powder, and introduce the remaining clear water into the mixing tank (6); Step 3: After the pre-mixing is completed, when the powder and the liquid agent need to be mixed for use, deliver the liquid agent sucked in the liquid delivery system (5) and the pre-mixed powder to the mixing tank (6) for secondary mixing with the clear water, and then deliver the mixed liquid to the discharge main pipe (3) through the discharge pump (2), When the powder and the liquid agent do not need to be mixed for use, deliver the pre-mixed powder to the mixing tank (6) for secondary mixing with the clear water, and then deliver the mixed liquid to the discharge main pipe (3) through the discharge pump (2), and directly deliver the liquid agent in the liquid delivery system (5) to the discharge main pipe (3).

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