CN114441320B - Device and method for evaluating residual strength of temporary plugging agent - Google Patents
Device and method for evaluating residual strength of temporary plugging agent Download PDFInfo
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- CN114441320B CN114441320B CN202011221519.4A CN202011221519A CN114441320B CN 114441320 B CN114441320 B CN 114441320B CN 202011221519 A CN202011221519 A CN 202011221519A CN 114441320 B CN114441320 B CN 114441320B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
Abstract
The invention discloses a residual strength evaluation device for a temporary plugging agent of liquid, which comprises a first liquid storage tank, a second liquid storage tank, a rock plate diversion chamber, a temperature control box and a waste liquid recovery part, wherein the rock plate diversion chamber is arranged in the temperature control box, a pair of rock plates are arranged in the rock plate diversion chamber, a crack is formed between the pair of rock plates, two ends of the rock plate diversion chamber corresponding to the crack are respectively provided with a diversion chamber inlet and a diversion chamber outlet, a pressure sensor for measuring pressure is arranged at the position corresponding to the diversion chamber inlet, the diversion chamber outlet is connected with the waste liquid recovery part through a pipeline, the first liquid storage tank is communicated or not communicated with the diversion chamber inlet, the second liquid storage tank is communicated or not communicated with the diversion chamber inlet, and the device further comprises a power part. The device provided can simulate the injection and plugging process of the actual liquid temporary plugging agent, experiments are carried out by using the rock plate, the simulated stratum environment can be prepared, the temperature control device can be used for preparing the simulated stratum temperature, and the residual strength of the liquid temporary plugging agent can be accurately measured.
Description
Technical Field
The invention relates to the technical field of oil and gas field development fracturing, in particular to a device and a method for evaluating residual strength of a liquid temporary plugging agent.
Background
The liquid temporary plugging agent mainly uses the reaction of polyvalent metal ions and polar groups on linear macromolecular chains to form high-viscosity liquid through crosslinking, so as to generate high-strength gel, plug the hydraulic fracture, improve the net pressure, realize temporary plugging in a rubber plug form in a target layer and realize fracture steering. After the temporary plugging diversion fracturing process is implemented, the residual strength of the liquid temporary plugging agent is an important index for measuring the performance of the liquid temporary plugging agent, and is also a key factor for influencing the success and failure of temporary plugging diversion fracturing construction. At present, the related technology is as follows:
the patent with publication number of CN108956413A discloses a temporary plugging strength performance evaluation method of an in-seam temporary plugging agent for oilfield fracturing. The method mainly solves the problem that the conventional method cannot systematically, effectively, quantitatively and accurately evaluate the temporary plugging strength performance of the temporary plugging agent in the fracture for oilfield fracturing. According to basic data of fracturing construction, a laboratory diversion capability testing device is adopted to simulate temporary plugging of temporary plugging agents in fracturing cracks, and corresponding testing parameters and evaluation methods of temporary plugging strength of temporary plugging agents in the cracks are provided. The invention has the advantages of accurately, objectively and effectively evaluating the temporary plugging strength performance of the temporary plugging agent in the fracture for oilfield fracturing.
The patent with the publication number of CN204495654U discloses a temporary plugging strength testing device for testing the temporary plugging strength of simulated cracks. The temporary plugging strength testing device is used for testing temporary plugging strength of the simulated fracture and comprises a fracture simulation unit, the fracture simulation unit is provided with a temporary plugging agent liquid inlet end and a temporary plugging agent liquid outlet end, the temporary plugging agent liquid inlet end is connected with a temporary plugging agent solution pressing-in device through a hard pipeline so as to press the temporary plugging agent solution into the fracture simulation unit from the temporary plugging agent liquid inlet end, and the temporary plugging agent liquid inlet end is further provided with a pressure gauge capable of testing the pressure of the temporary plugging agent entering the fracture simulation unit. The temporary plugging strength testing device is not provided with a valve, so that the throttling plugging of the valve is avoided.
The paper (Lai Najun, chen Ke, ma Hongwei, ji Yamin, she Zhong. Evaluation of the performance of water-soluble fracturing temporary plugging agent [ J ]. Oilfield chemistry, 2014,31 (02): 215-218.) uses starch, acrylic acid and acrylamide as raw materials to synthesize a water-soluble fracturing temporary plugging agent, the plugging strength and the plugging rate of the temporary plugging agent are evaluated through a core experiment, specifically, starch, acrylic acid and acrylamide are used as raw materials, ammonium persulfate and sodium bisulfite are used as initiators, an organic matter DJ-1 with an unsaturated double bond is used as a cross-linking agent, and the performance of the water-soluble fracturing temporary plugging agent is synthesized and characterized. The results show that as the temperature rises and the dissolution time is prolonged, the water solubility of the temporary plugging agent in the formation water is increased. When the solid-liquid ratio of the temporary plugging agent to the stratum water is 1:300 at the temperature of 20-80 ℃, the water solubility of the temporary plugging agent is 96% -98% at 16h, and the water solubility is good. After complete dissolution, the viscosity of the 5-20g/L solution is 12.6-53.7 mPa.s, and the flowback performance is good. The tensile strength of the 20g/L temporary plugging agent solution reaches 9.1N, and the adhesion capability is good. Core experiments show that the plugging strength of the temporary plugging agent is reduced along with the increase of the core permeability, the maximum value of the pressure gradient is 47.1MPa/m, and the temporary plugging agent has the capability of plugging the original crack and deviating the new crack from the direction of the maximum main stress. The blocking rate of the temporary blocking agent to the core is more than 90%, and the permeability recovery rate of the core after flushing with formation water is as high as 97.6%. The selective plugging rate of the temporary plugging agent to the high permeable layer is more than 83.2%, and the plugging rate of the temporary plugging agent to the high permeable layer is increased along with the increase of the core permeability level difference.
The article (Ling, huang Xiaojun, huang Guicun, yang Yi) describes a low-pressure gas well liquid rubber plug temporary plugging technology research and application [ J ]. A broken block oil-gas field, 2011,18 (03): 393-396.) combines with a liquid rubber plug temporary plugging action mechanism, a liquid rubber plug temporary plugging agent formula suitable for Chuan-xi low-pressure gas reservoir is debugged on the basis of performance requirement analysis of the liquid rubber plug temporary plugging agent, and a multifunctional core displacement device is adopted in a laboratory to evaluate the strength of the liquid rubber plug.
In summary, the related patents and articles of the temporary plugging agents disclosed in the prior art mainly aim at evaluating the temporary plugging strength of the temporary plugging agents. However, the related studies on the residual strength of the liquid temporary plugging agent currently have the following disadvantages: (1) experiments are carried out by using the steel plate, so that the real stratum environment cannot be simulated; (2) experiments are carried out indoors and outdoors, the real temperature of the stratum cannot be simulated, namely the influence of the temperature on the temporary plugging agent cannot be evaluated; (3) the evaluation of the residual strength of the temporary plugging agent is not formed into a scientific system evaluation device and a scientific system evaluation method at present. Therefore, the evaluation method of the residual strength of the temporary plugging agent has a large room for improvement.
Disclosure of Invention
The invention provides a device and a method for evaluating residual strength of a temporary plugging agent. The device and the method provided by the invention are used for evaluating the residual strength of the liquid temporary plugging agent, so that the liquid temporary plugging agent suitable for a target layer is optimized, and the device and the method have very important significance on whether the steering fracturing construction can be successful.
The invention provides a liquid temporary plugging agent residual strength evaluation device which has the following technical scheme:
the device comprises a first liquid storage tank, a second liquid storage tank, a rock plate diversion chamber, a temperature control box and a waste liquid recovery part, wherein the first liquid storage tank is used for storing the liquid temporary plugging agent, the second liquid storage tank is used for storing fracturing liquid, the rock plate diversion chamber is arranged in the temperature control box, a pair of rock plates which are arranged along the length direction of the rock plate diversion chamber are arranged in the rock plate diversion chamber, a crack is formed between the pair of rock plates along the length direction of the rock plate diversion chamber, two ends of the rock plate diversion chamber corresponding to the crack are respectively provided with a diversion chamber inlet and a diversion chamber outlet, a pressure sensor used for measuring pressure is arranged at the corresponding diversion chamber inlet, the diversion chamber outlet is connected with the waste liquid recovery part through a pipeline, the first liquid storage tank is connected with the diversion chamber inlet through a valve arranged on the diversion chamber and is communicated with or not communicated with the diversion chamber inlet through opening or closing of the valve, the second liquid storage tank is connected with the diversion chamber inlet through a valve arranged on the second liquid storage tank through the valve arranged on the diversion chamber and is communicated with the second liquid storage tank through the temporary plugging chamber;
when the first liquid storage tank is communicated with the diversion chamber inlet and the second liquid storage tank is not communicated with the diversion chamber inlet, the power part can enable the temporary plugging agent to enter the diversion chamber inlet; when the first liquid storage tank is not communicated with the inlet of the diversion chamber and the second liquid storage tank is communicated with the inlet of the diversion chamber, the power part can enable the fracturing fluid to enter the inlet of the diversion chamber.
Preferably, a spacer is provided between the pair of rock plates to form the fracture capable of simulating a fracture of the formation.
Preferably, the first liquid storage tank and the second liquid storage tank are piston type liquid storage tanks, the power part comprises an air compressor and a constant-speed constant-pressure pump, the air compressor is connected with the constant-speed constant-pressure pump through a pipeline, and the constant-speed constant-pressure pump is respectively connected with the first liquid storage tank and the second liquid storage tank through pipelines.
Preferably, the outlet of the constant-speed constant-pressure pump is connected with a first outlet pipeline, a first valve is arranged on the first outlet pipeline, two branch pipelines are formed on the outlet pipeline at the downstream of the first valve and are respectively connected with the inlet of the first liquid storage tank and the inlet of the second liquid storage tank, a second valve is arranged on a branch pipeline connected with the inlet of the first liquid storage tank, and a third valve is arranged on a branch pipeline connected with the inlet of the second liquid storage tank;
the device comprises a first liquid storage tank, a second liquid storage tank, a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a diversion chamber inlet, wherein the first liquid storage tank is connected with the first liquid storage tank, the second liquid storage tank is connected with the second liquid storage tank, the third valve is connected with the first liquid storage tank, the fourth valve is connected with the second liquid storage tank, the fifth valve is connected with the third valve, and the fifth valve is connected with the third valve.
Preferably, the pair of rock plates are rock plates subjected to acid etching treatment to simulate an acid fracturing process, and pressurizing devices are arranged on two sides of the diversion trenches formed by the pair of rock plates and the cracks and used for simulating formation closure stress.
Preferably, the temperature controlled by the temperature control box ranges from room temperature to 300 ℃.
Preferably, the constant-speed constant-pressure pump is a double-cylinder constant-speed constant-pressure pump, and the flow range of the constant-speed constant-pressure pump is 0.01-60ml/min.
Preferably, the length, width and height of the pair of rock plates are 17.78cm, 3.81cm and 2-3cm respectively, and the two ends of the rock plates are semicircular.
The residual strength evaluation device for the temporary plugging agent has the following beneficial effects:
the device provided can simulate the injection and plugging process of the actual liquid temporary plugging agent, experiments are carried out by using the rock plate, the simulated stratum environment can be prepared, the temperature control device can be used for preparing the simulated stratum temperature, and the residual strength of the liquid temporary plugging agent can be accurately measured. Specifically, the first liquid storage tank is communicated with the inlet of the diversion chamber, the second liquid storage tank is not communicated with the inlet of the diversion chamber so as to form one path, and the second liquid storage tank is communicated with the inlet of the diversion chamber, and the first liquid storage tank is not communicated with the inlet of the diversion chamber so as to form another path.
Preferably, a spacer is provided between the pair of rock plates, so that formation cracks can be simulated.
Preferably, the rock plate subjected to acid etching treatment can simulate the formation fracture condition; meanwhile, the pressurizing device is arranged, so that the stratum closing stress can be simulated.
The invention also provides a method for evaluating the residual strength of the temporary plugging agent, which comprises the following steps:
a. providing the residual strength evaluation device of the temporary plugging agent;
b. the temporary plugging agent is configured to be stored in the first liquid storage tank;
c. configuring the fracturing fluid to be stored in the second liquid storage tank;
d. opening the temperature control box, and adjusting the temperature to the simulated stratum temperature;
e. when the first liquid storage tank is communicated with the inlet of the diversion chamber and the second liquid storage tank is not communicated with the inlet of the diversion chamber, the power part is adopted to enable the temporary plugging agent to enter the inlet of the diversion chamber, and a temporary plugging process is simulated;
f. the pressure sensor continuously records the pressure at the inlet of the diversion chamber, and when the pressure reaches the preset fracture pressure of the simulated stratum, the power part is closed for pressure relief;
g. the first liquid storage tank is not communicated with the diversion chamber inlet, the second liquid storage tank is communicated with the diversion chamber inlet, the power part is adopted to enable the fracturing fluid to enter the diversion chamber inlet, and the steering process is simulated;
h. the pressure sensor continuously records the pressure at the inlet of the diversion chamber, and when the pressure reaches the preset fracture pressure of the simulated stratum, the power part is closed for pressure relief;
i. then the first liquid storage tank is not communicated with the inlet of the diversion chamber, the second liquid storage tank is communicated with the inlet of the diversion chamber, the power part is adopted to enable the fracturing fluid to enter the inlet of the diversion chamber, the pressure sensor continuously records the pressure at the inlet of the diversion chamber, the pressure is continuously increased until the temporary plugging zone formed by the temporary plugging agent of the liquid is broken through, the pressure is rapidly reduced, and the power part is closed;
j. and recording the highest value of the pressure measured in the last step, namely the residual strength of the liquid temporary plugging agent.
Preferably, the step a includes the following steps:
a pair of rock plates subjected to acid etching treatment is prepared to simulate an early acid fracturing process, and a metal gasket is placed between the pair of rock plates to control the distance between the two rock plates, so that the width of a stratum fracture is simulated.
The invention also provides a method for evaluating the residual strength of the temporary plugging agent, which adopts the device provided by the invention to evaluate, so that the method has the same technical effect.
Drawings
FIG. 1 is a schematic structural view of an embodiment of a device for evaluating residual strength of a temporary plugging agent according to the present invention;
fig. 2 is a graph showing a change in pressure detected by the pressure sensor.
The reference numerals in fig. 1-2 are as follows:
the device comprises a first liquid storage tank 1, a second liquid storage tank 2, a rock plate diversion chamber 3, a rock plate 31, a temperature control box 4, a waste liquid recovery part 5, a pressure sensor 6, an air compressor 7, a constant speed and constant pressure pump 8, a first valve 9, a second valve 10, a third valve 11, a fourth valve 12 and a fifth valve 13.
Detailed Description
1-2, FIG. 1 is a schematic structural view of an embodiment of a device for evaluating residual strength of a temporary plugging agent according to the present invention; fig. 2 is a graph showing a change in pressure detected by the pressure sensor.
Referring to fig. 1, the invention refers to a device for evaluating residual strength of a temporary plugging agent of liquid, which comprises a first liquid storage tank 1, a second liquid storage tank 2, a rock plate diversion chamber 3, a temperature control box 4 and a waste liquid recovery part 5, wherein the first liquid storage tank 1 is used for storing the temporary plugging agent of liquid, the second liquid storage tank 2 is used for storing fracturing liquid, the rock plate diversion chamber 3 is arranged in the temperature control box 4, a pair of rock plates 31 arranged along the length direction of the rock plate diversion chamber 3 are arranged in the rock plate diversion chamber 3, a crack is formed between the pair of rock plates 31 along the length direction of the rock plate diversion chamber 3, two ends of the rock plate diversion chamber 3 corresponding to the crack are respectively provided with a diversion chamber inlet and a diversion chamber outlet, a pressure sensor 6 used for measuring pressure is arranged at the diversion chamber inlet, the diversion chamber outlet is connected with the waste liquid recovery part 5 through a pipeline, the first liquid storage tank 1 is connected with the diversion chamber inlet through a valve arranged on the first liquid storage tank, the first liquid storage tank 1 is communicated with or not communicated with the diversion chamber inlet through opening or closing of the valve, a crack is formed between the pair of rock plates 31 along the length direction of the rock plate diversion chamber 3, the first liquid storage chamber 2 is communicated with the temporary plugging agent through the inlet or the first liquid storage tank 2 through the inlet is opened or is not communicated with the first liquid inlet;
when the first liquid storage tank 1 is communicated with the inlet of the diversion chamber and the second liquid storage tank 2 is not communicated with the inlet of the diversion chamber, the power part can enable the temporary plugging agent to enter the inlet of the diversion chamber; when the first liquid storage tank 1 is not communicated with the inlet of the diversion chamber and the second liquid storage tank 2 is communicated with the inlet of the diversion chamber, the power part can enable the fracturing fluid to enter the inlet of the diversion chamber.
The provided device can simulate the injection and plugging process of the actual liquid temporary plugging agent, the rock plate 31 is used for experiments, the simulated stratum environment can be prepared, the temperature control device is used, the simulated stratum temperature can be prepared, and the residual strength of the liquid temporary plugging agent can be accurately measured. Specifically, the first liquid storage tank 1 is communicated with the inlet of the diversion chamber, the second liquid storage tank 2 is not communicated with the inlet of the diversion chamber to form one path, the second liquid storage tank 2 is communicated with the inlet of the diversion chamber, and the first liquid storage tank 1 is not communicated with the inlet of the diversion chamber to form another path.
Wherein a spacer is provided between a pair of rock plates 31 to form said fracture capable of simulating a fracture of the formation.
A spacer is provided between the pair of rock plates 31 to simulate formation fractures.
In a specific embodiment, as shown in fig. 1, the first liquid storage tank 1 and the second liquid storage tank 2 are piston liquid storage tanks, the power part comprises an air compressor 7 and a constant-speed constant-pressure pump 8, the air compressor 7 is connected with the constant-speed constant-pressure pump 8 through a pipeline, and the constant-speed constant-pressure pump 8 is respectively connected with the first liquid storage tank 1 and the second liquid storage tank 2 through pipelines.
Further, an outlet of the constant-speed constant-pressure pump 8 is connected with a first outlet pipeline, a first valve 9 is arranged on the first outlet pipeline, two branch pipelines are formed on the outlet pipeline at the downstream of the first valve 9 and are respectively connected with an inlet of the first liquid storage tank 1 and an inlet of the second liquid storage tank 2, a second valve 10 is arranged on a branch pipeline connected with the inlet of the first liquid storage tank 1, and a third valve 11 is arranged on a branch pipeline connected with the inlet of the second liquid storage tank 2;
the device further comprises a second outlet pipeline, two branch pipelines are formed at one end of the second outlet pipeline and are respectively connected with the outlet of the first liquid storage tank 1 and the outlet of the second liquid storage tank 2, a fourth valve 12 is arranged on the branch pipeline connected with the outlet of the first liquid storage tank 1, a fifth valve 13 is arranged on the branch pipeline connected with the outlet of the second liquid storage tank 2, and the other end of the second outlet pipeline is connected with the inlet of the diversion chamber.
Different paths are formed by opening or closing a plurality of valves, specifically as follows:
the valves 9, 10 and 12 are opened, the rest valves are closed, at the moment, the first liquid storage tank is communicated with the rock plate diversion chamber, the liquid temporary plugging agent enters the rock plate diversion chamber, the temporary plugging process is simulated, and when the pressure reaches the preset fracture pressure of the simulated stratum, the temporary plugging is realized; then, the valves 9, 11 and 13 are opened, the rest valves are closed, fracturing fluid is conveyed, the fracturing fluid can press the formed temporary plugging agent, a part of temporary plugging agent fails, when the pressure reaches the preset fracture pressure of the simulated stratum, the injection of the fracturing fluid is stopped, and the temporary plugging agent is the rest liquid temporary plugging agent; and then, opening the valve valves 9, 11 and 13, closing the rest valves, conveying the fracturing fluid again, pressurizing the rest liquid temporary plugging agent, and rapidly reducing the pressure when the temporary plugging zone formed by the rest liquid temporary plugging agent is broken through, wherein the highest value of the measured pressure is the rest strength of the liquid temporary plugging agent.
The pair of rock plates 31 are rock plates 31 subjected to acid etching treatment to simulate an acid fracturing process, and pressurizing devices are arranged on two sides of the pair of rock plates 31 and the diversion trench formed by the crack, so as to simulate formation closure stress.
The rock plate 31 treated by acid etching can simulate the condition of stratum fracture; meanwhile, the pressurizing device is arranged, so that the stratum closing stress can be simulated.
In this embodiment, the temperature controlled by the temperature control box 4 ranges from room temperature to 300 ℃. The constant-speed constant-pressure pump 8 is a double-cylinder constant-speed constant-pressure pump, and the flow range is 0.01-60ml/min. The length, width and height of the rock plates 31 are 17.78cm, 3.81cm and 2-3cm respectively, and the two ends of the rock plates 31 are semicircular.
The invention also provides a method for evaluating the residual strength of the temporary plugging agent, which comprises the following steps:
a. providing the residual strength evaluation device of the temporary plugging agent;
b. the temporary plugging agent is configured to be stored in the first liquid storage tank 1;
c. configuring the fracturing fluid to be stored in a second fluid storage tank 2 (steps b and c can be interchanged in sequence);
d. opening a temperature control box 4, adjusting the temperature to the simulated formation temperature, and pressurizing the crack between the rock plates to simulate formation closing stress;
e. when the first liquid storage tank 1 is communicated with the inlet of the diversion chamber and the second liquid storage tank 2 is not communicated with the inlet of the diversion chamber, the power part is adopted to enable the temporary plugging agent to enter the inlet of the diversion chamber, and a temporary plugging process is simulated;
f. the pressure sensor 6 continuously records the pressure at the inlet of the diversion chamber, and when the pressure reaches the preset fracture pressure of the simulated stratum, the power part is closed for pressure relief;
g. the first liquid storage tank 1 is not communicated with the inlet of the diversion chamber, the second liquid storage tank 2 is communicated with the inlet of the diversion chamber, the power part is adopted to enable the fracturing fluid to enter the inlet of the diversion chamber, and the steering process is simulated;
h. the pressure sensor 6 continuously records the pressure at the inlet of the diversion chamber, and when the pressure reaches the preset fracture pressure of the simulated stratum, the power part is closed for pressure relief;
i. then the first liquid storage tank 1 is not communicated with the inlet of the diversion chamber, the second liquid storage tank 2 is communicated with the inlet of the diversion chamber, the power part is adopted to enable the fracturing fluid to enter the inlet of the diversion chamber, the pressure sensor 6 continuously records the pressure at the inlet of the diversion chamber, the pressure is continuously increased until a temporary plugging zone formed by a temporary plugging agent of the liquid is broken through, the pressure is rapidly reduced, and the power part is closed;
j. and recording the highest value of the pressure measured in the last step, namely the residual strength of the liquid temporary plugging agent.
Further, the step a includes the following steps:
a pair of rock plates 31 subjected to acid etching treatment is prepared to simulate an early acid fracturing process, and a metal gasket is placed between the pair of rock plates 31 to control the distance between the two rock plates 31, thereby simulating the formation fracture width.
The method for evaluating the residual strength of the temporary plugging agent for the liquid provided by the invention has the same technical effect by adopting the device provided by the invention for evaluation.
One specific embodiment of the evaluation method using the above-described apparatus is as follows:
step one: preparing a rock plate 31, and carrying out pretreatment work of fracturing or acid fracturing on the rock plate 31; placing the pretreated rock plate 31 into the rock plate diversion chamber 3; the distance between the rock plates 31 is controlled by adding shims between the two rock plates 31. The distance between the rock plates 31 was designed to be 6mm to simulate the width of a fracture in the formation.
Step two: the temperature control box 4 was opened and the temperature was adjusted to 120 ℃ to simulate the actual formation temperature.
Step three: 4000mL or a sufficient amount of the liquid temporary plugging agent is disposed and poured into the first liquid storage tank 1.
Step four: 4000mL or a sufficient quantity of fracturing fluid is disposed and poured into a second tank for use 2.
Step five: the first liquid storage tank 1 is opened, and the second liquid storage tank 2 is closed. The first liquid storage tank 1 is communicated with the inlet of the diversion chamber, the second liquid storage tank 2 is not communicated with the inlet of the diversion chamber, the air compressor 7 and the constant-speed constant-pressure pump 8 are opened, and the displacement of the constant-speed constant-pressure pump 8 is set to be 50mL/min.
Step six: after the temperature control box 4 shows that the actual temperature reaches the preset temperature, the constant-speed constant-pressure pump 8 is started for experiment.
Step seven: the pressure value is continuously recorded by the pressure sensor 6, and is observed in real time, and when the pressure gradually rises, temporary blockage occurs in the rock plate 31. When the pressure value reaches 15MPa, namely the fracture pressure of the stratum, the Guan Hengsu constant pressure pump 8 stops displacement and releases pressure.
Step eight: the first liquid storage tank 1 is closed, and the second liquid storage tank 2 is opened. The displacement of the constant-speed constant-pressure pump 8 was set to 50mL/min, and displacement was started.
Step nine: and observing the pressure value recorded by the pressure sensor 6, stopping displacement and releasing pressure when the pressure value reaches 15MPa, namely the fracture pressure of the stratum, wherein the Guan Hengsu constant pressure pump 8 stops displacement.
Step ten: the displacement of the constant-speed constant-pressure pump 8 was set to 50mL/min, and displacement was continued.
Step eleven: the pressure value recorded by the pressure sensor 6 is observed, the pressure gradually rises, and the pressure rapidly drops after reaching the maximum value. At this time, the temporary plugging zone is broken through, the Guan Hengsu constant pressure pump 8 stops displacement, and pressure is relieved.
Step twelve: the maximum pressure value recorded in the step eleven is the residual strength of the temporary plugging agent liquid, which is 9.14MPa.
Referring to fig. 2, a graph of pressure change during the process is shown.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent substitutions of the invention will occur to those skilled in the art, which are within the spirit and scope of the invention.
Claims (10)
1. The device is characterized by comprising a first liquid storage tank, a second liquid storage tank, a rock plate diversion chamber, a temperature control box and a waste liquid recovery part, wherein the first liquid storage tank is used for storing the liquid temporary plugging agent, the second liquid storage tank is used for storing fracturing fluid, the rock plate diversion chamber is arranged in the temperature control box, a pair of rock plates arranged along the length direction of the rock plate diversion chamber are arranged in the rock plate diversion chamber, a crack is formed between the pair of rock plates along the length direction of the rock plate diversion chamber, two ends of the rock plate diversion chamber corresponding to the crack are respectively provided with a diversion chamber inlet and a diversion chamber outlet, a pressure sensor used for measuring pressure is arranged at the corresponding diversion chamber inlet, the diversion chamber outlet is connected with the waste liquid recovery part through a pipeline, the first liquid storage tank is connected with the diversion chamber inlet through a valve arranged on the first liquid storage tank, the diversion chamber inlet is communicated or not communicated with the diversion chamber inlet through opening or closing of the valve, a crack is formed between the second liquid storage tank and the first liquid storage tank is connected with the temporary plugging agent through the valve arranged on the second liquid storage tank, and the pressure sensor is also communicated with the first liquid storage tank through the diversion chamber inlet or the second liquid storage chamber through the valve;
when the first liquid storage tank is communicated with the diversion chamber inlet and the second liquid storage tank is not communicated with the diversion chamber inlet, the power part can enable the temporary plugging agent to enter the diversion chamber inlet; when the first liquid storage tank is not communicated with the inlet of the diversion chamber and the second liquid storage tank is communicated with the inlet of the diversion chamber, the power part can enable the fracturing fluid to enter the inlet of the diversion chamber.
2. The apparatus for evaluating the residual strength of a temporary plugging agent according to claim 1, wherein a spacer is provided between the pair of rock plates to form the fracture capable of simulating a formation fracture.
3. The device for evaluating the residual strength of the temporary plugging agent according to claim 1, wherein the first liquid storage tank and the second liquid storage tank are piston type liquid storage tanks, the power part comprises an air compressor and a constant-speed constant-pressure pump, the air compressor is connected with the constant-speed constant-pressure pump through a pipeline, and the constant-speed constant-pressure pump is respectively connected with the first liquid storage tank and the second liquid storage tank through pipelines.
4. The device for evaluating the residual strength of the temporary plugging agent according to claim 3, wherein the outlet of the constant-speed and constant-pressure pump is connected with a first outlet pipeline, a first valve is arranged on the first outlet pipeline, two branch pipelines are formed on the outlet pipeline at the downstream of the first valve and are respectively connected with the inlet of the first liquid storage tank and the inlet of the second liquid storage tank, a second valve is arranged on the branch pipeline connected with the inlet of the first liquid storage tank, and a third valve is arranged on the branch pipeline connected with the inlet of the second liquid storage tank;
the device comprises a first liquid storage tank, a second liquid storage tank, a first valve, a second valve, a third valve, a fourth valve, a fifth valve and a diversion chamber inlet, wherein the first liquid storage tank is connected with the first liquid storage tank, the second liquid storage tank is connected with the second liquid storage tank, the third valve is connected with the first liquid storage tank, the fourth valve is connected with the second liquid storage tank, the fifth valve is connected with the third valve, and the fifth valve is connected with the third valve.
5. The device for evaluating the residual strength of the temporary plugging agent according to claim 1, wherein the pair of rock plates are rock plates subjected to acid etching treatment to simulate an acid fracturing process, and pressurizing devices are arranged on two sides of diversion trenches formed by the pair of rock plates and the cracks and used for simulating formation closure stress.
6. The device for evaluating the residual strength of the temporary plugging agent according to claim 1, wherein the temperature controlled by the temperature control box ranges from room temperature to 300 ℃.
7. The device for evaluating the residual strength of the temporary plugging agent according to claim 1, wherein the constant-speed constant-pressure pump is a double-cylinder constant-speed constant-pressure pump, and the flow rate range is 0.01-60ml/min.
8. The device for evaluating the residual strength of the temporary plugging agent according to claim 1, wherein the length, width and height of the pair of rock plates are 17.78cm, 3.81cm and 2-3cm respectively, and both ends of the rock plates are semicircular.
9. The method for evaluating the residual strength of the temporary plugging agent for the liquid is characterized by comprising the following steps of:
a. providing a device for evaluating the residual strength of the liquid temporary plugging agent according to any one of claims 1 to 8;
b. the temporary plugging agent is configured to be stored in the first liquid storage tank;
c. configuring the fracturing fluid to be stored in the second liquid storage tank;
d. opening the temperature control box, adjusting the temperature to the simulated stratum temperature, and pressurizing the crack between the rock plates to simulate stratum closing stress;
e. when the first liquid storage tank is communicated with the inlet of the diversion chamber and the second liquid storage tank is not communicated with the inlet of the diversion chamber, the power part is adopted to enable the temporary plugging agent to enter the inlet of the diversion chamber, and a temporary plugging process is simulated;
f. the pressure sensor continuously records the pressure at the inlet of the diversion chamber, and when the pressure reaches the preset fracture pressure of the simulated stratum, the power part is closed for pressure relief;
g. the first liquid storage tank is not communicated with the diversion chamber inlet, the second liquid storage tank is communicated with the diversion chamber inlet, the power part is adopted to enable the fracturing fluid to enter the diversion chamber inlet, and the steering process is simulated;
h. the pressure sensor continuously records the pressure at the inlet of the diversion chamber, and when the pressure reaches the preset fracture pressure of the simulated stratum, the power part is closed for pressure relief;
i. then the first liquid storage tank is not communicated with the inlet of the diversion chamber, the second liquid storage tank is communicated with the inlet of the diversion chamber, the power part is adopted to enable the fracturing fluid to enter the inlet of the diversion chamber, the pressure sensor continuously records the pressure at the inlet of the diversion chamber, the pressure is continuously increased until the temporary plugging zone formed by the temporary plugging agent of the liquid is broken through, the pressure is rapidly reduced, and the power part is closed;
j. and recording the highest value of the pressure measured in the last step, namely the residual strength of the liquid temporary plugging agent.
10. The method for evaluating the residual strength of a temporary plugging agent according to claim 9, wherein the step a comprises the steps of:
a pair of rock plates subjected to acid etching treatment is prepared to simulate an early acid fracturing process, and a metal gasket is placed between the pair of rock plates to control the distance between the two rock plates, so that the width of a stratum fracture is simulated.
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