Device and method for evaluating plugging capacity of knotted temporary plugging agent

Abstract

The invention provides a device and a method for evaluating the plugging capacity of a knotted temporary plugging agent. The device comprises a liquid storage module, a pump injection module, a safe shunting module, a knotted temporary plugging agent putting module, a connecting pipeline module, a simulation tubular column module, a simulation perforation hole module and a data acquisition module, wherein the liquid storage module, the pump injection module, the safe shunting module, the knot temporary plugging agent putting module and the simulation tubular column module are sequentially connected through the connecting pipeline module; the simulation perforation hole module is arranged in the simulation tubular column module; and the data acquisition module monitors other modules. The fluid carrying technology is adopted, throwing of the knotted temporary plugging agent is facilitated, meanwhile, modular design is used, and research on various influence factors of the knotted temporary plugging agent can be carried out. The evaluation method provided by the invention realizes experimental evaluation of the plugging capacity of the knotted temporary plugging agent under the simulated formation condition, and is high in accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas field development and production increase, and in particular to a device and method for evaluating the plugging ability of a knotted temporary plugging agent. Background Art

[0002] Temporary plugging fracturing technology is an important means to speed up and improve the efficiency of fracturing in unconventional oil and gas horizontal wells. Efficient and high-quality temporary plugging of perforations is the basic prerequisite for ensuring sufficient fracturing of multiple clusters in a section. However, the shape of perforations is irregular, and sand fracturing may even cause erosion and expansion, resulting in poor plugging effect of conventional temporary plugging agents. As a new type of perforation plugging material, knot temporary plugging agent can preferentially enter the perforation, and the knot has a large compression deformation, which can effectively plug irregular perforations. The migration law and plugging characteristics of knot temporary plugging agents in pipes are quite different from those of conventional spherical or granular temporary plugging agents, and it is necessary to study targeted plugging experimental evaluation devices and methods.

[0003] There are obvious differences in structure between knot temporary plugging agents and commonly used spherical temporary plugging agents. Figure 1 As shown in the figure, the knot temporary plugging agent is formed by a combination of two major structures: a knot and a tail wing. The tail wing can be stretched in the liquid, easily affected by the movement of the fluid, and points in the direction of the fluid movement. This type of structure can greatly improve the efficiency of the knot temporary plugging agent entering the perforation hole. Due to the special configuration of the knot temporary plugging agent, higher requirements are also put forward for the experimental evaluation of its plugging ability. The device and method for evaluating the conventional spherical temporary plugging agent may have problems such as the knot temporary plugging agent being blocked, the migration being restricted, and the plugging failure. Therefore, it is necessary to innovatively design the experimental evaluation device and method of the knot temporary plugging agent.

[0004] As a new type of temporary plugging material, there is currently little public research content on knot temporary plugging agents.

[0005] Zhou Fujian et al. published a paper titled "Experimental Study on the Migration and Plugging Law of Knot-type Temporary Plugging Agents". In the paper, a knot-type temporary plugging agent experimental evaluation device was proposed. The device includes a liquid supply system, a power system, a temporary plugging agent delivery device, a transparent pipeline device, and a water pipeline. The liquid supply system uses a 1m 3 The water supply tank is connected to the transparent tube tail device through a water pipeline to ensure sufficient liquid supply during the experiment; the power system consists of a diesel generator and a Roots oil pump to ensure that the displacement required for the experiment reaches 0.2m 3 / min; the temporary plugging agent delivery device is used to deliver the temporary plugging agent; the transparent tube has a diameter of 140mm, a wall thickness of 20mm, and a pipeline length of 5m. The front end is connected to the temporary plugging agent delivery device, and three perforation holes with a diameter of 10mm are set in the middle and rear sections. The migration of the temporary plugging agent in the pipeline and the sealing state can be observed in real time through the transparent pipeline. The device is used to study the migration of the temporary plugging agent and the sealing rules of the holes under different construction parameters, so as to guide the on-site construction. The evaluation device uses a transparent pipe column, focusing on visually observing the migration state of the knot temporary plugging agent in the pipe and the process of entering the perforation hole. However, the pressure bearing capacity of the transparent pipe column is limited, and it is impossible to simulate the sealing process of the knot temporary plugging agent under real construction conditions.

[0006] Zhang Wang et al. published a paper entitled "Research on the Performance of Knot Temporary Plugging and Field Application", in which a method for evaluating the indoor pressure-bearing capacity of knot temporary plugging agents was described. In the experiment, knot temporary plugging was selected for pressure-bearing capacity test, and the corresponding unblocking pressure test was carried out after completion. As the injection time increases, the injection pressure continues to increase due to the plugging of the hole by the knot temporary plugging, and at the same time, the plugging strength of the knot temporary plugging is also significantly improved. In the unblocking pressure test experiment, the pressure dropped suddenly when the inlet pressure reached 1-2MPa, indicating that the plugging structure has been released. This evaluation method focuses on the evaluation of the forward plugging and reverse unblocking processes of the knot temporary plugging agent. However, this method only considers the static pressure-bearing capacity of the knot temporary plugging agent under laboratory conditions, and its pressure-bearing capacity evaluation method is similar to that of the spherical temporary plugging agent.

[0007] In the published patents, no relevant content on the device and method for experimental evaluation of the plugging ability of knot temporary plugging agents has been found. Most of the relevant content is applicable to spherical temporary plugging agents and cannot meet the needs of experimental evaluation of the plugging ability of knot temporary plugging agents.

[0008] CN202111041394 discloses an experimental device and test method for evaluating the plugging ability of drilling and fracturing, the device includes: an injection system, a simulation system, a temperature control system, a leakage system, a metering system and a data acquisition system; the large displacement pump has a working pressure of 0-50MPa and a working flow of 0.1ml-500ml, the piston container has a volume of 2000mL, a pressure resistance of 50MPa, and is made of 316L material, which is used to store the displacement medium and act as a buffer. The experimental parameters set in this technical solution are quite different from the actual situation, and a crack module or a metal module is used to simulate the plugging position. Through technical parameter analysis, the experimental device considers the plugging situation in the crack more, and cannot simulate the plugging of the perforation holes.

[0009] CN202211376017 discloses a device and experimental method for evaluating the migration and plugging performance of temporary plugging materials for temporary fracturing, and the device includes a pumping module, a simulated wellbore module, a simulated perforation module, and a simulated fracture module. The device combines the wellbore with the simulated fracture to simulate the performance of temporary plugging materials in the wellbore and in the formation, respectively. The device uses a combination of a plunger pump and a closed sand mixer to achieve mixed transportation of temporary plugging materials and fluids, which is quite different from direct delivery in actual construction conditions; and the scheme does not describe the delivery device and structure of knotted temporary plugging agents or spherical temporary plugging agents.

[0010] Currently, there are many devices for evaluating the plugging ability of temporary plugging agents, but they are mainly used to evaluate spherical or granular temporary plugging materials. They mostly use gravity delivery and fix holes or cracks as plugging targets. Summary of the invention

[0011] In order to solve the above technical problems, the purpose of the present invention is to provide a device and method for evaluating the plugging ability of a knot temporary plugging agent, so as to evaluate the plugging ability of a knot temporary plugging agent on perforations under conditions that simulate real construction as much as possible.

[0012] To achieve the above purpose, the present invention provides a device for evaluating the plugging ability of a knot temporary plugging agent, which includes a liquid storage module, a pump injection module, a safety diversion module, a knot temporary plugging agent delivery module, a pipeline connection module, a simulation column module, a simulation perforation hole module, and a data acquisition module;

[0013] Among them, the liquid storage module, the pump injection module, the safety diversion module, the knot temporary plugging agent delivery module, and the simulation column module are sequentially connected in series through the connecting pipeline module;

[0014] The simulated perforation hole module is arranged in the simulated pipe string module;

[0015] The data acquisition module monitors other modules.

[0016] According to a specific embodiment of the present invention, preferably, the data acquisition module monitors at least one module among the pumping module, the safety diversion module, the knot temporary plugging agent delivery module, the connecting pipeline module, and the simulation string module.

[0017] According to a specific embodiment of the present invention, preferably, the connecting pipeline module includes an experimental main pipeline.

[0018] According to a specific embodiment of the present invention, preferably, the data acquisition module includes a control computer and at least one monitoring component controlled by the control computer.

[0019] According to a specific embodiment of the present invention, preferably, the safety diversion module includes a diversion three-way valve, a throttle valve, a diversion stop valve, and a safety diversion pipeline;

[0020] One end of the diversion three-way valve is connected to the pumping module, one end is connected to the diversion stop valve, and one end is connected to the throttle valve; the other end of the throttle valve is connected to the safety diversion pipeline, and the other end of the diversion stop valve is connected to the experimental main pipeline; the safety diversion pipeline is connected to the liquid storage module.

[0021] In the present invention, the safety shunt module can limit the maximum system pressure of the device of the present invention. Since complete blocking is completed in an instant, if the fluid continues to flow into the experimental main line and the simulation column module, the system pressure will increase sharply and damage the device. Therefore, the present invention is provided with a safety shunt module, which can limit the maximum system pressure of the device of the present invention and control the system pressure not to exceed a certain set pressure value. When the system is completely blocked, the fluid can all pass through the shunt pipeline to prevent the system pressure from increasing sharply and damaging the device.

[0022] According to a specific embodiment of the present invention, preferably, the monitoring component includes a safety shunt flow meter, and the safety shunt flow meter is arranged on the safety shunt pipeline.

[0023] According to a specific embodiment of the present invention, preferably, the knot temporary plugging agent delivery module is connected in parallel with the experimental main line, and the knot temporary plugging agent delivery module includes a dispenser connecting pipeline and a temporary plugging knot storage short circuit. The top of the temporary plugging knot storage short circuit is provided with a pipeline ball thrower connection port, and the bottom is provided with a dispenser stop valve; one end of the dispenser connecting pipeline is connected to the experimental main line, and the other end is connected to the pipeline ball thrower connection port of the temporary plugging knot storage short circuit. A connecting stop valve is also provided on the dispenser connecting pipeline, and the bottom of the temporary plugging knot storage short circuit is connected to the experimental main line.

[0024] The present invention designs a connecting pipeline for the dispenser before the temporary plugging knot storage short circuit. The fluid in the pipeline can make the knot temporary plugging agent in the temporary plugging knot storage short circuit smoothly enter the experimental main pipeline when the system pressure and flow remain unchanged, so as to realize the pressure-release of the knot temporary plugging agent and prevent the knot temporary plugging agent from being blocked in the temporary plugging knot storage short circuit. According to a specific embodiment of the present invention, preferably, the connecting pipeline module also includes a plunger pump water supply pipeline and a plunger pump water outlet pipeline.

[0025] According to a specific embodiment of the present invention, preferably, one end of the pumping module is connected to the liquid storage module through a plunger pump water supply pipeline, and the other end is connected to the safety diversion module through a plunger pump water outlet pipeline.

[0026] According to a specific embodiment of the present invention, preferably, the pumping module includes a plunger pump, and the control computer controls and reads the experimental parameters of the plunger pump.

[0027] According to a specific embodiment of the present invention, preferably, the monitoring component includes a plunger pump outlet pressure sensor and a plunger pump outlet flow sensor, and the plunger pump outlet pressure sensor and the plunger outlet flow meter are arranged on the plunger pump outlet pipeline. In the present invention, the flow sensors are all non-contact type, and the pressure sensor acquisition frequency is greater than 1000HZ.

[0028] According to a specific embodiment of the present invention, preferably, the simulated tubing module comprises a simulated tubing and a tubing heating jacket; one end of the simulated tubing is connected to the experimental main line, and the other end is a closed dead plug; the tubing heating jacket is coated on the outer layer of the simulated tubing. The simulated tubing module of the present invention can simulate formation temperature.

[0029] According to a specific embodiment of the present invention, preferably, the monitoring component comprises an analog tubing temperature controller, and the analog tubing temperature controller is connected to and controls a tubing heating jacket.

[0030] According to a specific embodiment of the present invention, preferably, the monitoring component includes an experimental main line flow meter and an experimental main line pressure sensor; the experimental main line flow meter and the experimental main line pressure sensor are arranged on the experimental main line.

[0031] According to a specific embodiment of the present invention, preferably, the simulated perforation hole module comprises a simulated perforation hole seat and a detachable simulated hole;

[0032] The simulated pipe string is provided with a simulated perforation position, the simulated perforation hole seat is arranged at the simulated perforation position, the detachable simulated hole is movably installed on the simulated perforation hole seat, and the detachable simulated hole is provided with a hole passing through the central axis thereof.

[0033] The simulation perforation hole module of the present invention can achieve the effect of simulating the shape of the perforation holes of the formation.

[0034] According to a specific embodiment of the present invention, preferably, the setting density of the simulated perforation positions on the simulated pipe string is 10-30 holes / m, and the phase angle is 5-90°;

[0035] According to a specific embodiment of the present invention, preferably, the pumping module, the safety diversion module, the knot temporary plugging agent delivery module, the connecting pipeline module, the simulated pipe column module, and the simulated hole module are all made of stainless steel 316L, which can withstand a pressure of 50 MPa.

[0036] In order to realize the experimental evaluation of the plugging ability of the knot temporary plugging agent under simulated formation conditions, the present invention also provides a method for evaluating the plugging ability of the knot temporary plugging agent, which is implemented by using the above-mentioned device for evaluating the plugging ability of the knot temporary plugging agent. The method comprises the following steps:

[0037] For the device, set the experimental setting pressure and experimental setting temperature that are the same as the actual situation; under the condition that the linear velocity of the fluid in the device is consistent with the actual situation, calculate and set the experimental setting flow rate of the device;

[0038] The liquid storage module, the pumping module, and the safety diversion module are connected by the connecting pipeline module, and the pumping module is turned on to allow the fluid in the liquid storage module to enter the safety diversion module and then return to the liquid storage module, and it is checked whether the safety diversion module can ensure that the pressure at the outlet of the pumping module is lower than the experimental setting pressure; if not, it is necessary to replace the components in the safety diversion module and then conduct the experiment; if yes, the pressure at the outlet of the pumping module controlled by the safety diversion module is equal to the experimental setting pressure;

[0039] Connect all modules, put a specific amount of knot temporary plugging agent into the knot temporary plugging agent delivery module, and load the simulated perforation hole module into the simulated tubing module to form holes of a specific number and shape, then turn on the pump injection module to allow the knot temporary plugging agent to flow into the simulated tubing module, and control the flow rate at the outlet of the pump injection module to maintain the experimental set flow rate, and observe the flow rate and plugging situation in the simulated tubing module after the simulated tubing module continuously discharges liquid;

[0040] If it is not completely blocked, it is considered that the knot temporary plugging agent cannot achieve blocking under the experimental setting flow rate;

[0041] If the blockage is complete, the temperature of the simulated tubing module is raised to the experimental setting temperature, and then the pressure in the simulated tubing module and the duration of continuous blockage when the blockage is complete are recorded;

[0042] Evaluation: The fewer the number of knot temporary plugging agents used to achieve complete plugging, the higher the pressure of the simulated string module, and the longer the plugging duration, the better the plugging performance of the knot temporary plugging agent.

[0043] According to a specific embodiment of the present invention, preferably, the method for evaluating the plugging ability of the knot temporary plugging agent comprises the following steps:

[0044] (1) Collect the actual construction displacement, actual construction pipe string cross-sectional area, and experimental simulation pipe string cross-sectional area of ​​the knot temporary plugging agent to be evaluated, and preset the experimental setting pressure, experimental setting temperature, and experimental setting maximum plugging time that are the same as the actual construction conditions;

[0045] The experimental setting flow rate is calculated according to the following formula:

[0046]

[0047] Q 实验 : Experimental setting flow rate, m 3 / min

[0048] Q 真实 : Actual construction displacement, m3 / min

[0049] A 实验 : Experimental simulation column cross-sectional area, mm 2

[0050] A 真实 : Actual construction pipe column cross-sectional area, mm 2

[0051] (2) Inject fluid into the liquid storage module, turn on the pump injection module, open the throttle valve to the maximum opening, and close the diverter stop valve; slowly increase the flow rate of the plunger pump from low to high to the experimental setting flow rate, and record the pressure when the throttle valve is at the maximum opening; if the pressure at the plunger pump outlet exceeds the experimental setting pressure at this time, it is necessary to replace the throttle valve with a larger diameter; if the pressure at the plunger pump outlet does not exceed the experimental setting pressure at this time, slowly close the throttle valve to make the pressure at the plunger pump outlet reach the experimental setting pressure;

[0052] (3) Turn off the plunger pump, open the diverter stop valve, disconnect the pipeline ball dispenser connection port, and close the dispenser stop valve; then, put the knot temporary plugging agent required for the experiment into the temporary plugging knot storage short circuit;

[0053] (4) Connect the pipeline ball thrower connection port and close the connecting stop valve;

[0054] (5) Installing the detachable simulated perforations required for the experiment into the simulated perforation seat;

[0055] (6) Adjust the flow rate at the plunger pump outlet to the experimental setting flow rate, wait for the perforation position to continuously discharge liquid, and record the flow value of the experimental main line flow meter at this time;

[0056] (7) Open the connecting stop valve, then open the stop valve of the dispenser, record the values ​​of the flow meter and pressure sensor of the experimental main line in real time, and observe the blockage of the perforation position;

[0057] If the perforation position is completely blocked, open the pipe heating jacket to heat the simulated pipe until the experimental setting temperature; keep the process stable, and record the values ​​of the experimental main line flow meter, experimental main line pressure sensor, simulated pipe temperature controller, and the time to maintain complete blocking in real time; when the process reaches the longest blocking time set in the experiment, the experiment stops;

[0058] If the perforation position is not completely blocked, the experiment is stopped, and it is judged that the knot temporary plugging agent cannot block under the set conditions and has no pressure bearing capacity;

[0059] (8) Evaluation: When completely plugged, the plugging capacity of the knot temporary plugging agent is determined by the number of knots required to completely plug the perforation position, the pressure bearing capacity after complete plugging, and the pressure bearing time under the highest pressure condition. The fewer the number of knots required to completely plug the perforation position, the higher the pressure bearing capacity (test main line pressure), and the longer the pressure bearing time (the time to maintain complete plugging), the better the performance of the knot temporary plugging agent.

[0060] In the above method for evaluating the plugging ability of the knot temporary plugging agent, preferably, after the experiment is stopped, the connection between the simulated pipe string and the experimental main line is disconnected, the knot temporary plugging agent plugging the detachable simulated hole is cleared, and finally the experimental process is restored to the initial state.

[0061] The technical solution provided by the present invention has the following beneficial effects:

[0062] Due to the presence of tassels, the success rate of gravity delivery of knot temporary plugging agents is low, and it is easy to cause accumulation in the ball delivery tube, making it impossible to carry out experiments smoothly. The present invention adopts fluid carrying technology to facilitate the delivery of knot temporary plugging agents. At the same time, modular design can be used to study various influencing factors of knot temporary plugging agents. The experimental results can support the optimization of knot temporary plugging agent structure and construction parameters.

[0063] The evaluation method of the invention realizes experimental evaluation of the plugging ability of the knot temporary plugging agent under simulated formation conditions with high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic diagram of the structure of the knot temporary plugging agent;

[0065] Figure 2 This is a schematic diagram of the structure of the device for evaluating the plugging ability of the knot temporary plugging agent in Example 1;

[0066] Figure 3 It is a structural schematic diagram of the simulated perforation hole module of Example 1;

[0067] Figure 4 Schematic diagram of different simulated perforation hole shapes;

[0068] Figure 5 This is a diagram of the pressure change in the simulated pipe column 601 shown by the experimental main line pressure sensor 806 in Example 2.

[0069] Description of Figure Numbers:

[0070] 1. Liquid storage tank;

[0071] 2. Plunger pump;

[0072] 301, diversion three-way valve; 302, throttle valve; 303, diversion stop valve, 304, safety diversion pipeline;

[0073] 401, connecting pipeline of dispenser, 402, connecting stop valve, 403, connecting port of pipeline ball dispenser, 404, short circuit for temporary blocking knot storage, 405, stop valve of dispenser;

[0074] 501, plunger pump water supply pipeline, 502, plunger pump water outlet pipeline, 503, experimental main pipeline;

[0075] 601, simulated pipe column, 602, pipe column heating jacket;

[0076] 701, simulated perforation position, 702, simulated perforation seat, 703, detachable simulated eyelet, 704, eyelet;

[0077] 801. Control computer, 802. Piston pump outlet pressure sensor, 803. Piston pump outlet flow sensor, 804. Safety diversion flowmeter, 805. Experimental main line flowmeter, 806. Experimental main line pressure sensor, 807. Simulation column temperature controller. DETAILED DESCRIPTION

[0078] In order to have a clearer understanding of the technical features, purposes and beneficial effects of the present invention, the technical solution of the present invention is now described in detail below, but it should not be construed as limiting the applicable scope of the present invention.

[0079] Example 1

[0080] This embodiment provides a device for evaluating the plugging ability of a knotted temporary plugging agent. Figure 2 As shown, it includes

[0081] It includes a liquid storage module, a pump injection module, a safety diversion module, a knot temporary plugging agent delivery module, a pipeline connection module, a simulation string module, a simulation perforation hole module, and a data acquisition module;

[0082] Among them, the liquid storage module, the pumping module, the safety diversion module, the knot temporary plugging agent delivery module, and the simulated tubing module are connected in sequence through the connecting pipeline module; the connecting pipeline module includes the experimental main pipeline 503; the simulated perforation hole module is arranged in the simulated tubing module; the data acquisition module monitors the pumping module, the safety diversion module, the knot temporary plugging agent delivery module, the connecting pipeline module, and the simulated tubing module; the data acquisition module includes a control computer 801 and multiple monitoring components controlled by it.

[0083] The liquid storage module is used to store the liquid required for the experiment, and is composed of a liquid storage tank 1;

[0084] The pumping module is used to pump the fluid in the liquid storage tube into the experimental pipeline, and is composed of a plunger pump 2;

[0085] The safety diversion module uses the three-way diversion principle to ensure the safe operation of the entire experimental system after the knot temporary plugging agent has completely blocked the perforation holes. It consists of a diversion three-way valve 301, a throttle valve 302, a diversion stop valve 303, and a safety diversion pipeline 304.

[0086] The knot temporary plugging agent delivery module is used to store and deliver the knot temporary plugging agent required for the experiment. The knot temporary plugging agent delivery module is connected in parallel with the experimental main pipeline 503. The knot temporary plugging agent delivery module includes a delivery device connecting pipeline 401 and a temporary plugging knot storage short circuit 404. The temporary plugging knot storage short circuit 404 is provided with a pipeline ball delivery device connection port 403 at the top and a delivery device stop valve 405 at the bottom. The delivery device connecting pipeline 401 is also provided with a connecting stop valve 402;

[0087] The connecting pipeline module is used to connect various experimental modules, and is composed of a plunger pump water supply pipeline 501, a plunger pump water outlet pipeline 502, and an experimental main pipeline 503;

[0088] The simulated tubing string module is used to simulate the tubing string, which can be set to a horizontal or vertical state, and is composed of a simulated tubing string 601 and a tubing string heating jacket 602. The simulated tubing string 601 is provided with a simulated perforation position 701;

[0089] The simulated perforation hole module is used to set the hole size and is detachable for easy replacement. Figure 4 The perforations of different shapes and sizes are shown; Figure 3 As shown, the simulated perforation hole module includes a simulated perforation hole seat 702 and a detachable simulated hole 703;

[0090] The data acquisition module is used to control and monitor the experimental process and record the experimental data in real time. It consists of a control computer 801, a plunger pump outlet pressure sensor 802, a plunger pump outlet flow sensor 803, a safety diversion flowmeter 804, an experimental main line flowmeter 805, an experimental main line pressure sensor 806, and a simulation column temperature controller 807; the flow sensors are all non-contact, and the pressure sensor acquisition frequency is greater than 1000HZ;

[0091] The connection relationship between the above modules is as follows:

[0092] One end of the plunger pump 2 is connected to the liquid storage tank 1 through the plunger pump water supply pipeline 501, and the other end is connected to the diversion three-way valve 301 through the plunger pump water outlet pipeline 502;

[0093] One end of the diverter three-way valve 301 is connected to the plunger pump 2, one end is connected to the diverter stop valve 303, and one end is connected to the throttle valve 302; the other end of the throttle valve 302 is connected to the safety diverter pipeline 304; the other end of the diverter stop valve 303 is connected to the experimental main pipeline 503; the safety diverter pipeline 304 is then connected to the liquid storage tank 1;

[0094] One end of the dispenser connecting pipeline 401 is connected to the experimental main pipeline 503, and the other end is connected to the pipeline ball dispenser connection port 403 of the temporary plugging knot storage short circuit 404, and the bottom of the temporary plugging knot storage short circuit 404 is connected to the experimental main pipeline 503;

[0095] One end of the simulated tubing string 601 is connected to the experimental main line 503, and the other end is closed and plugged; the tubing string heating jacket 602 is coated on the outer layer of the simulated tubing string 601, while avoiding the simulated perforation hole module;

[0096] The simulated perforation position 701 is set on the simulated pipe string 601, with a setting density of 16 holes / m and a phase angle of 30°; the simulated perforation hole seat 702 is set on the simulated perforation position 701 and fixed by threaded connection; the detachable simulated hole 703 is set inside the simulated perforation hole seat 702 and sealed by an O-ring; the detachable simulated hole 703 is provided with a hole 704 running through the central axis thereof, and the purpose of setting different perforation holes is achieved by replacing different detachable simulated holes 703;

[0097] The control computer 801 connects, controls and reads the plunger pump 2, the plunger pump outlet pressure sensor 802, the plunger pump outlet flow sensor 803, the safety diversion flow meter 804, the experimental main line flow meter 805, the experimental main line pressure sensor 806, and the simulation column temperature controller 807;

[0098] The plunger pump outlet pressure sensor 802 and the plunger pump outlet flow sensor 803 are arranged on the plunger pump water outlet pipeline 502; the safety diversion flowmeter 804 is arranged on the safety diversion pipeline 304; the experimental main line flowmeter 805 is arranged on the experimental main line 503; the experimental main line pressure sensor 806 is arranged on the experimental main line 503 and is between the experimental main line flowmeter 805 and the simulated tubing 601; the simulated tubing temperature controller 807 is connected to and controls the tubing heating jacket 602.

[0099] Example 2

[0100] This embodiment provides a method for evaluating the plugging ability of a knot temporary plugging agent, which is implemented using the device for evaluating the plugging ability of a knot temporary plugging agent in Example 1. The method of this embodiment includes the following steps:

[0101] (1) Preset the following parameters:

[0102] 10 20mm knot temporary plugging agents were placed, and the actual construction displacement was 3m 3 / min, the actual construction pipe column inner diameter is 89mm, and the cross-sectional area is 6217mm 2 The inner diameter of the experimental simulation column is 50mm and the cross-sectional area is 1962mm 2, set 10 10mm round holes, the experimental setting pressure is 30MPa, the experimental setting temperature is 120℃, and the experimental setting maximum plugging time is 3 hours;

[0103] (2) The experimental setting flow rate is calculated according to the following formula:

[0104]

[0105] Q 实验 : Experimental setting flow rate, m 3 / min

[0106] Q 真实 : Actual construction displacement, m 3 / min

[0107] A 实验 : Experimental simulation column cross-sectional area, mm 2

[0108] A 真实 : Actual construction pipe column cross-sectional area, mm 2

[0109] Using the above formula to calculate the experimental flow rate: 0.94m 3 / min;

[0110] (3) Open the throttle valve 302 to the maximum opening, close the diverter stop valve 303, and slowly increase the flow rate of the plunger pump 2 from low to high to the experimental setting flow rate of 0.94m 3 / min, record the pressure when the throttle valve 302 is at its maximum opening; at this time, the pressure value is 35MPa, which exceeds the experimental set pressure value by 30MPa, and replace the throttle valve 302 with a larger diameter;

[0111] After replacing the throttle valve 302, open it to the maximum opening, close the diverter stop valve 303, and slowly increase the flow rate of the plunger pump 2 from low to high to the experimental setting flow rate of 0.94m 3 / min, record the pressure when the throttle valve 302 is at its maximum opening; at this time, the pressure value is 25MPa, and the pressure value does not exceed the experimental set pressure value of 30MPa, and slowly close the throttle valve 302 until the pressure reaches the experimental set pressure value of 30MPa;

[0112] (4) Turn off the plunger pump 2, open the diverter stop valve 303, disconnect the pipeline ball dispenser connection port 403, and close the dispenser stop valve 405; then, put 10 20 mm knot temporary plugging agents into the temporary plugging knot storage short circuit 404;

[0113] (5) Connect the pipeline ball thrower connection port 403 and close the connecting stop valve 402;

[0114] (6) 10 detachable simulated holes 703 with 10 mm circular holes are installed into the simulated perforation hole seat 702, and the remaining hole seats are completely sealed with dead plugs;

[0115] (7) Adjust the flow rate of plunger pump 2 to the experimental setting flow rate of 0.94m 3 / min, after the simulated perforation position 701 continuously discharges liquid, the flow value of the experimental main line flow meter 805 is recorded at this time;

[0116] (8) Open the connecting stop valve 402, wait for 2 seconds and then open the dispenser stop valve 405, record the values ​​of the experimental main line flow meter 805 and the experimental main line pressure sensor 806 in real time, and observe the blockage of the simulated perforation position 701;

[0117] If it is completely blocked, open the pipe heating jacket 602 and heat the simulated pipe 601 to the experimental set temperature of 120°C. After the temperature of the simulated pipe 601 rises to 120°C, start timing and keep it; if the pressure of the experimental main line is maintained for 3 hours, the experiment is stopped;

[0118] If the plugging is not complete, it is considered that the knot temporary plugging agent cannot achieve plugging under the experimental setting flow rate and has no pressure bearing capacity, and the experiment is stopped;

[0119] After the experiment is stopped, the connection between the simulated pipe string 601 and the experimental main line 503 is disconnected, the knot temporary plugging agent plugged in the detachable simulated hole 703 is removed, and finally the experimental process is restored to the initial state;

[0120] Evaluation: When completely plugged, the plugging capacity of the knot temporary plugging agent is determined by the number of knots required to completely plug the simulated perforation position 701, the pressure bearing capacity after complete plugging, and the pressure bearing time under the highest pressure condition; among them, the fewer the number of knot temporary plugging agents, the higher the pressure bearing capacity, and the longer the pressure bearing time when completely plugged, the better the performance of the knot temporary plugging agent.

[0121] Figure 5 The pressure change diagram in the simulated column 601 shown by the experimental main line pressure sensor 806 is shown in FIG. Figure 5 It can be seen that when 10 elliptical holes are temporarily blocked with a knotted rope, there is slight seepage and the pressure can be increased to 30MPa after bearing pressure for 3 hours. After blocking a single hole, the pressure increases by 0.5-1MPa.

Claims

1. A device for evaluating the plugging ability of a knot temporary plugging agent, comprising a liquid storage module, a pumping module, a safety diversion module, a knot temporary plugging agent delivery module, a pipeline connection module, a simulation column module, a simulation perforation hole module, and a data acquisition module; in, The liquid storage module, the pump injection module, the safety diversion module, the knot temporary plugging agent delivery module, and the simulation column module are sequentially connected in series through the connecting pipeline module; The simulated perforation hole module is arranged in the simulated pipe string module; The data acquisition module monitors other modules.

2. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 1, wherein: The data acquisition module monitors at least one module among the pumping module, the safety diversion module, the knot temporary plugging agent delivery module, the pipeline connection module, and the simulation string module.

3. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 1, wherein: The connecting pipeline module includes an experimental main pipeline.

4. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 3, wherein: The data acquisition module includes a control computer and at least one monitoring component controlled by the control computer.

5. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 4, wherein: The safety diversion module includes a diversion three-way valve, a throttle valve, a diversion stop valve, and a safety diversion pipeline; One end of the diversion three-way valve is connected to the pumping module, one end is connected to the diversion stop valve, and one end is connected to the throttle valve; the other end of the throttle valve is connected to the safety diversion pipeline, and the other end of the diversion stop valve is connected to the experimental main pipeline; the safety diversion pipeline is connected to the liquid storage module.

6. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 5, wherein: The monitoring component comprises a safety shunt flow meter, which is arranged on the safety shunt pipeline.

7. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 3, wherein: The knot temporary plugging agent delivery module is connected in parallel with the experimental main line, and the knot temporary plugging agent delivery module includes a delivery device connecting pipeline and a temporary plugging knot storage short circuit. The top of the temporary plugging knot storage short circuit is provided with a pipeline ball thrower connection port, and the bottom is provided with a delivery device stop valve; one end of the delivery device connecting pipeline is connected to the experimental main line, and the other end is connected to the pipeline ball thrower connection port of the temporary plugging knot storage short circuit. A connecting stop valve is also provided on the delivery device connecting pipeline, and the bottom of the temporary plugging knot storage short circuit is connected to the experimental main line.

8. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 3, wherein: The connecting pipeline module also includes a plunger pump water supply pipeline and a plunger pump water outlet pipeline.

9. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 8, wherein: One end of the pump injection module is connected to the liquid storage module through a plunger pump water supply pipeline, and the other end is connected to the safety diversion module through a plunger pump water outlet pipeline.

10. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 4, wherein: The pumping module includes a plunger pump, and the control computer controls and reads the experimental parameters of the plunger pump.

11. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 8, wherein: The monitoring component comprises a plunger pump outlet pressure sensor and a plunger pump outlet flow sensor. The plunger pump outlet pressure sensor and the plunger outlet flow meter are arranged on the plunger pump water outlet pipeline.

12. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 3, wherein: The simulation string module comprises a simulation string and a string heating jacket; one end of the simulation string is connected to the experimental main line, and the other end is a closed dead plug; the string heating jacket is coated on the outer layer of the simulation string.

13. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 12, wherein: The monitoring component includes a simulated tubing temperature controller, which is connected to and controls a tubing heating jacket.

14. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 4, wherein: The monitoring component comprises an experimental main line flow meter and an experimental main line pressure sensor; the experimental main line flow meter and the experimental main line pressure sensor are arranged on the experimental main line.

15. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 1, wherein: The simulated perforation hole module includes a simulated perforation hole seat and a detachable simulated hole; The simulated pipe string is provided with a simulated perforation position, the simulated perforation hole seat is arranged at the simulated perforation position, the detachable simulated hole is movably installed on the simulated perforation hole seat, and the detachable simulated hole is provided with a hole passing through the central axis thereof.

16. The device for evaluating the plugging ability of a knotted temporary plugging agent according to claim 1, wherein: The pump injection module, safety diversion module, knot temporary plugging agent delivery module, pipeline connection module, simulated pipe column module and simulated hole module are all made of stainless steel 316L.

17. A method for evaluating the plugging ability of a knotted temporary plugging agent, which is implemented by using the device for evaluating the plugging ability of a knotted temporary plugging agent according to any one of claims 1 to 16, and the method comprises the following steps: For the device, set the experimental setting pressure and experimental setting temperature that are the same as the actual situation; under the condition that the linear velocity of the fluid in the device is consistent with the actual situation, calculate and set the experimental setting flow rate of the device; The liquid storage module, the pumping module, and the safety diversion module are connected by the connecting pipeline module, and the pumping module is turned on to allow the fluid in the liquid storage module to enter the safety diversion module and then return to the liquid storage module, and it is checked whether the safety diversion module can ensure that the pressure at the outlet of the pumping module is lower than the experimental setting pressure; if not, it is necessary to replace the components in the safety diversion module and then conduct the experiment; if yes, the pressure at the outlet of the pumping module controlled by the safety diversion module is equal to the experimental setting pressure; Connect all modules, put a specific amount of knot temporary plugging agent into the knot temporary plugging agent delivery module, and load the simulated perforation hole module into the simulated tubing module to form holes of a specific number and shape, then turn on the pump injection module to allow the knot temporary plugging agent to flow into the simulated tubing module, and control the flow rate at the outlet of the pump injection module to maintain the experimental set flow rate, and observe the flow rate and plugging situation in the simulated tubing module after the simulated tubing module continuously discharges liquid; If it is not completely blocked, it is considered that the knot temporary plugging agent cannot achieve blocking under the experimental setting flow rate; If the blockage is complete, the temperature of the simulated tubing module is raised to the experimental setting temperature, and then the pressure in the simulated tubing module and the duration of continuous blockage when the blockage is complete are recorded; Evaluation: The fewer the number of knot temporary plugging agents used to achieve complete plugging, the higher the pressure of the simulated string module, and the longer the plugging duration, the better the plugging performance of the knot temporary plugging agent.

18. The method for evaluating the plugging ability of a knotted temporary plugging agent according to claim 17, wherein: The method comprises the following steps: (1) Collect the actual construction displacement, actual construction pipe string cross-sectional area, and experimental simulation pipe string cross-sectional area of ​​the knot temporary plugging agent to be evaluated, and preset the experimental setting pressure, experimental setting temperature, and experimental setting maximum plugging time that are the same as the actual construction conditions; The experimental setting flow rate is calculated according to the following formula: Q 实验 : Experimental setting flow rate, m 3 / min Q 真实 : Actual construction displacement, m 3 / min A 实验 : Experimental simulation column cross-sectional area, mm 2 A 真实 : Actual construction pipe column cross-sectional area, mm 2 (2) Inject fluid into the liquid storage module, turn on the pump injection module, open the throttle valve to the maximum opening, and close the diverter stop valve; slowly increase the flow rate of the plunger pump from low to high to the experimental setting flow rate, and record the pressure when the throttle valve is at the maximum opening; if the pressure at the plunger pump outlet exceeds the experimental setting pressure at this time, it is necessary to replace the throttle valve with a larger diameter; if the pressure at the plunger pump outlet does not exceed the experimental setting pressure at this time, slowly close the throttle valve to make the pressure at the plunger pump outlet reach the experimental setting pressure; (3) Turn off the plunger pump, open the diverter stop valve, disconnect the pipeline ball dispenser connection port, and close the dispenser stop valve; then, put the knot temporary plugging agent required for the experiment into the temporary plugging knot storage short circuit; (4) Connect the pipeline ball thrower connection port and close the connecting stop valve; (5) Installing the detachable simulated perforations required for the experiment into the simulated perforation seat; (6) Adjust the flow rate at the plunger pump outlet to the experimental setting flow rate, wait for the perforation position to continuously discharge liquid, and record the flow value of the experimental main line flow meter at this time; (7) Open the connecting stop valve, then open the stop valve of the dispenser, record the values ​​of the flow meter 805 and the pressure sensor of the experimental main line in real time, and observe the blockage of the perforation position; If the perforation position is completely blocked, open the pipe heating jacket to heat the simulated pipe until the experimental setting temperature; keep the process stable, and record the values ​​of the experimental main line flow meter, experimental main line pressure sensor, simulated pipe temperature controller, and the time to maintain complete blocking in real time; when the process reaches the longest blocking time set in the experiment, the experiment stops; If the perforation position is not completely blocked, the experiment is stopped, and it is judged that the knot temporary plugging agent cannot block under the set conditions and has no pressure bearing capacity; (8) Evaluation: When completely plugged, the plugging capacity of the knot temporary plugging agent is determined by the number of knots required to completely plug the perforation position, the pressure bearing capacity after complete plugging, and the pressure bearing time under the highest pressure condition. The fewer the number of knots required to completely plug the perforation position, the higher the pressure bearing capacity, and the longer the pressure bearing time, the better the performance of the knot temporary plugging agent.

19. The method for evaluating the plugging ability of a knotted temporary plugging agent according to claim 18, wherein: After the experiment is stopped, the connection between the simulated pipe string and the experimental main line is disconnected, the knot temporary plugging agent used to seal the detachable simulated hole is cleared, and finally the experimental process is restored to the initial state.

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