CN108196002B - Performance evaluation device and test method for temporary plugging steering fluid for fracture acidizing - Google Patents
Performance evaluation device and test method for temporary plugging steering fluid for fracture acidizing Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 48
- 238000011156 evaluation Methods 0.000 title claims abstract description 29
- 238000010998 test method Methods 0.000 title abstract description 6
- 230000000977 initiatory effect Effects 0.000 claims abstract description 75
- 238000002347 injection Methods 0.000 claims abstract description 73
- 239000007924 injection Substances 0.000 claims abstract description 73
- 239000011435 rock Substances 0.000 claims abstract description 44
- 238000012545 processing Methods 0.000 claims abstract description 29
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 230000000903 blocking effect Effects 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 81
- 239000007788 liquid Substances 0.000 claims description 49
- 238000003860 storage Methods 0.000 claims description 33
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 25
- 239000011780 sodium chloride Substances 0.000 claims description 25
- 230000004323 axial length Effects 0.000 claims description 12
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 10
- 239000000243 solution Substances 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000012267 brine Substances 0.000 claims description 6
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 6
- 239000001103 potassium chloride Substances 0.000 claims description 5
- 235000011164 potassium chloride Nutrition 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 238000001802 infusion Methods 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000005336 cracking Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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Abstract
The invention discloses a performance evaluation device and a test method of a temporary plugging steering fluid for fracture acidizing. The device includes: the system comprises an injection unit, at least one crack initiation unit, a heating unit and a data processing and evaluating system; the crack initiation unit comprises a rock core with a hole, an annular pressing rubber sleeve for wrapping the rock core, a holder for holding the rock core and the annular pressing rubber sleeve, a first pressure sensor for detecting the inlet end of the crack initiation unit and a second pressure sensor for detecting the internal pressure of the holder, or a differential pressure sensor for detecting the crack initiation unit; and the data processing and evaluating system is used for acquiring data of the injection unit and the crack initiation unit, analyzing and processing the data and evaluating the performance of the temporary blocking steering fluid. In the whole testing process, the rock core is naturally cracked, the ring pressure on the rock core is kept unchanged, and the ring pressure is closer to the real cracking state of the natural rock in the stratum, so that the evaluation result of the temporary plugging diversion fluid is more real and reliable.
Description
Technical Field
The invention relates to the field of oil and gas field reservoir transformation, in particular to a temporary plugging diverting liquid performance evaluation device for fracture acidizing and a test method thereof.
Background
Prior to the exploitation of an oil and gas field, most oil and gas wells require reservoir transformation to obtain industrial oil and gas flow.
In the process of reservoir transformation, firstly, injecting fracturing and acidizing working fluid into a construction well, under the action of fluid characteristics, preferentially transforming a high-permeability reservoir by the working fluid, then injecting temporary plugging steering fluid, enabling the temporary plugging steering fluid to enter the high-permeability reservoir to block the high-permeability reservoir, enabling subsequent working fluid not to enter a blocked layer, and then injecting the working fluid into an oil well to transform a low-permeability reservoir.
Different diversion liquids have different plugging effects on the reservoir. Before reservoir transformation, in order to realize good blocking effect of the temporary blocking diverting liquid on the reservoir, the performance of the temporary blocking diverting liquid needs to be evaluated.
At present, the evaluation of the performance of the temporary plugging diversion fluid is mostly limited to the evaluation of the plugging performance of the temporary plugging diversion fluid on cracks, manual crack splitting is carried out on a rock core or a rock plate in advance, then the split rock core or the rock plate is stacked in a holder according to a prototype to carry out an evaluation test, the split crack cannot be completely folded again in the crack splitting mode, the experimental error is large, the true form of the cracks after the natural cracking of the rock cannot be simulated, and the accuracy of the evaluation result of the temporary plugging diversion fluid is seriously influenced.
Disclosure of Invention
The invention provides a temporary plugging diverting fluid performance evaluation device for fracture acidizing and a test method thereof, which are used for solving the problem that in the prior art, an evaluation result of a temporary plugging diverting fluid is inaccurate because an artificial crack can not truly reflect the true form of a crack after a rock is naturally cracked. The technical scheme is as follows:
in one aspect, the invention provides a performance evaluation device for temporary plugging steering fluid for fracture acidizing, which comprises:
the system comprises an injection unit, at least one crack initiation unit, a heating unit and a data processing and evaluating system;
the injection unit is used for injecting liquid into the crack initiation unit;
the fracture initiation unit comprises a rock core with a hole, an annular pressing rubber sleeve used for wrapping the rock core, a holder used for holding the rock core and the annular pressing rubber sleeve, a first pressure sensor used for detecting the inlet end of the fracture initiation unit and a second pressure sensor used for detecting the internal pressure of the holder, or a differential pressure sensor used for detecting the fracture initiation unit;
the heating unit is used for heating the injection unit and the crack initiation unit;
the data processing and evaluating system is used for acquiring data of the injection unit and the crack initiation unit, analyzing and processing the data and evaluating the performance of the temporary plugging steering fluid.
Preferably, a steel pipe for sealing the hole is arranged in the hole; the axial length of the bore was 1/3-1/2 of the axial length of the core.
More preferably, the axial length of the core is 7-20cm, and the diameter is 2.5-5 cm; the diameter of the hole is 5-6.35 mm.
More preferably, the core has an axial length of 13-17cm and a diameter of 3.8-5 cm.
Preferably, the number of the fracture initiation units is more than two, and each of the fracture initiation units is connected in parallel.
Specifically, the injection unit includes: the water storage tank, the injection pump connected with the water outlet end of the water storage tank, and the first liquid storage tank and the second liquid storage tank which are connected in parallel and connected with the water outlet end of the injection pump; the annular pressure injection pump is connected with the water outlet end of the water storage tank; the first liquid storage tank and the second liquid storage tank are both provided with a first cavity separated by a piston and a second cavity communicated with the injection pump; and the second pressure sensor is arranged on a connecting pipeline between the outlet end of the ring pressure injection pump and the clamp.
Specifically, the data processing and evaluation system includes: the collecting device corresponds to the crack initiation unit and is used for collecting the liquid flowing out of the crack initiation unit; a balance metering device for weighing the collection device; and the processing terminal is used for analyzing and processing the data of the injection unit and the fracture initiation unit and evaluating the temporary plugging diversion fluid.
On the other hand, the invention provides a method for testing the performance of temporary plugging steering fluid for fracture acidizing, which comprises the following steps:
1) the heating unit heats the injection unit and the crack initiation unit to a preset temperature;
2) the injection unit injects water into the space between the clamp holder and the ring-pressing rubber sleeve of any one of the crack initiation units to form ring-pressing seal;
3) the injection unit injects water or saline water into the hole, the pressure is suppressed until the rock core is fractured, and the water or the saline water is continuously injected until the flow rate of the water or the saline water in the fractured fracture is stable;
4) injecting temporary plugging steering fluid into the hole by the injection unit, and then injecting water or the saline water until the flow velocity of the water or the saline water in the cracks of the plugged rock core is stable;
5) and the data processing and evaluating system acquires the data of the injection unit and the crack initiation unit, analyzes and processes the data and evaluates the performance of the temporary plugging steering fluid.
Specifically, the pressure of the injection pump is 0-105MPa, and the injection flow is 0-107 mL/min.
Preferably, the saline water is a potassium chloride solution with the mass fraction of 3%.
Specifically, the heating temperature of the heating unit is 0-177 ℃, and the heating rate is 4-8 ℃/min.
The technical scheme provided by the embodiment of the invention has the beneficial effects that: the injection unit firstly injects water between the holder of the crack initiation unit and the ring-pressing rubber sleeve to form a ring-pressing seal, then injects water or saline water into the hole of the rock core, presses the rock core to initiate naturally, measures the seepage capability of the crack after initiation, then injects the temporary plugging diversion fluid to be measured to plug the naturally initiated crack, and the data processing and evaluation system collects the data of the injection unit and the crack initiation unit, analyzes the data and evaluates the performance of the temporary plugging diversion fluid. In the whole testing process, the rock core is naturally cracked, the ring pressure on the rock core is kept unchanged, and the ring pressure is closer to the real cracking state of the natural rock in the stratum, so that the evaluation result of the temporary plugging diversion fluid is more real and reliable.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of a fracture acidizing temporary plugging diverting fluid performance evaluation device according to an exemplary embodiment of the present invention;
the reference numerals in the drawings denote:
1. an injection unit; 101. a water storage tank; 1011. a first chamber; 1012. a second chamber; 102. an injection pump; 103. a first liquid storage tank; 1031. a first chamber of the first reservoir; 1032. a second chamber of the first reservoir; 1033. a piston of the first reservoir; 104. a second liquid storage tank; 1041. a first chamber of the second reservoir; 1042. a second chamber of the second reservoir; 1043. a piston of the second liquid storage tank; 105. a ring pressure injection pump; 2. a crack initiation unit; 201. a core; 2011. an aperture; 202. a differential pressure sensor; 203. a holder; 204. a first pressure sensor; 205. a second pressure sensor; 3. a heating unit; 4. a data processing and evaluation system; 401. a collection device; 402. a balance metering device; 5. a valve; 6. a check valve.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
In one aspect of the present invention, as shown in fig. 1, the present invention provides a performance evaluation device for a temporary plugging diverting fluid for fracture acidizing. This fracture acidizing is with stifled steering fluid performance evaluation device of temporary, includes:
an injection unit 1, at least one fracture initiation unit 2, a heating unit 3 and a data processing and evaluation system 4;
the injection unit 1 is used for injecting liquid into the fracture initiation unit 2;
the fracture initiation unit 2 comprises a core 201 with a hole 2011, an annular rubber sleeve for wrapping the core 201, a holder 203 for holding the core 201 and the annular rubber sleeve, a first pressure sensor 204 for detecting the inlet end of the fracture initiation unit 2 and a second pressure sensor 205 (annular pressure sensor) for detecting the internal pressure of the holder 203 or a differential pressure sensor 202 for detecting the fracture initiation unit 2;
the heating unit 3 is used for heating the injection unit 1 and the crack initiation unit 2;
the data processing and evaluating system 4 is used for acquiring data of the injection unit 1 and the fracture initiation unit 2, analyzing and processing the data and evaluating the performance of the temporary plugging steering fluid. Wherein the annulus is not shown in figure 1.
When the temporary plugging diversion device is used, the injection unit firstly injects water between the holder of the crack initiation unit and the ring-pressing rubber sleeve to form a ring-pressing seal, then injects water or saline water into the hole of the rock core, presses the rock core to initiate cracks naturally, measures the seepage capability of the cracks after initiation, then injects temporary plugging diversion liquid to be measured to plug the cracks which initiate naturally, and the data processing and evaluation system acquires the data of the injection unit and the crack initiation unit, analyzes and processes the data and evaluates the performance of the temporary plugging diversion liquid. In the whole test process, the rock core is naturally cracked, the ring pressure on the rock core is kept unchanged, and the ring pressure is closer to the real cracking state of the natural rock in the stratum, so that the evaluation result of the temporary plugging diverting liquid is more real and reliable.
The construction of the crack initiation unit 2 will be described in detail below.
In actual operation, since the measurement accuracy of the differential pressure sensor is higher than that of the pressure sensor, and the measurement range of the differential pressure sensor is smaller than that of the pressure sensor, as shown in fig. 1, a first pressure sensor 204 for detecting the inlet end of the fracture initiation unit 2 and a second pressure sensor 205 for detecting the internal pressure of the holder 203 (the ring pressure of the core) and a differential pressure sensor 202 for detecting the fracture initiation unit 2 can be simultaneously installed on the pipeline of the fracture initiation unit 2.
As shown in fig. 1, a valve 5 for opening or closing the crack initiation unit is provided at an inlet end of the crack initiation unit 2.
In order to prevent the pressure of the rock core 201 from being released when the pressure-building fracture starts, a steel pipe (not shown in fig. 1) for fixedly sealing the hole 2011 is arranged in the hole 2011, and the steel pipe and the hole wall are sealed by high-strength epoxy resin.
As will be appreciated by those skilled in the art, a core is a cylindrical sample of rock taken from a bore hole using a core ring bit and other coring tools as required for geological work or engineering.
Theoretically, the larger the core, and correspondingly, the larger the hole, the closer to the true fracture initiation of the formation rock.
In practice, the axial length of the bore 2011 is 1/3-1/2 of the axial length of the core 201.
Specifically, the axial length of the core 201 is 7-20cm, the diameter is 2.5-5cm, preferably, the axial length of the core 201 is 13-17cm, and the diameter is 3.8-5 cm; the diameter of the hole is 5-6.35 mm.
In a specific embodiment of the fracture initiation unit 2, the number of the fracture initiation units 2 is more than two, and each of the fracture initiation units 2 is connected in parallel to realize the fracturing of different rock cores, so that the temporary plugging steering fluid is tested to plug different fractures generated by fracturing of different rock cores. Of course, according to actual conditions, the single use or the parallel use of two or more than two units can be realized through the switch of the valve 5 arranged at the inlet end of the crack initiation unit 2, and the blocking performance of the temporary blocking steering fluid on rocks of different reservoirs is simulated.
The structure of the injection unit 1 will be described in detail below.
As shown in fig. 1, the injection unit 1 includes: the water storage tank 101, an injection pump 102 connected with the water outlet end of the water storage tank 101, and 2 first liquid storage tanks 103 and second liquid storage tanks 104 connected in parallel and connected with the water outlet end of the injection pump 102; a ring pressure injection pump 105 connected with the water outlet end of the water storage tank 101; the first reservoir 103 and the second reservoir 104 are each provided with first chambers 1031 and 1041 separated by pistons 1033 and 1041 and second chambers 1032 and 1042 communicating with the injection pump 102; a second pressure sensor 205 (ring pressure sensor) is provided on the connection line between the outlet end of the ring pressure injection pump 105 and the gripper 203.
In practical applications, the first chamber 1031 of the first reservoir may contain water or saline; the second chamber 1032 of the first reservoir contains water; the first chamber 1041 of the second liquid storage tank contains the temporary plugging steering fluid, and the second chamber 1042 of the second liquid storage tank contains water. The injection pump 102 continuously injects the water in the water storage tank 101 into the second chambers 1032 and 1042, and causes the pistons 1033 and 1043 to be pushed toward the first chambers 1031 and 1041, so that the liquid (water or saline, temporary blocking diverting liquid) contained in the first chambers 1031 and 1041 is injected into the crack initiation unit 2.
Also, in practice, valves 5 are provided at the inlet ends of the second chambers 1032 and 1042, respectively. At the outlet ends of the first chambers 1031 and 1041, valves 5 are provided, respectively.
Firstly, water or saline water in a water storage tank 101 is injected between a holder and an annular pressure rubber sleeve by an annular pressure injection pump 105 to form an annular pressure coated core, then water or saline water is injected into a crack initiation unit 2 from a first chamber 1031 of a first liquid storage tank to form a suppressed pressure to initiate the crack of the core, the core is continuously injected into the crack initiation unit 2 until the flow rate is stable, then a temporary plugging steering fluid is injected into the crack initiation unit 2 from a first chamber 1041 of a second liquid storage tank to plug the crack, and finally the water or saline water is injected into the crack initiation unit 2 from the first chamber 1031 of the first liquid storage tank until the flow rate is stable, so that the plugging performance of the temporary plugging steering fluid is tested.
In practical application, the connection lines between the water storage tank 101 and the injection pump 102 and the ring pressure injection pump 105 are respectively provided with valves for controlling water drainage. Additionally, it will be understood by those skilled in the art that the infusion pump 102 and the ring pressure infusion pump 105 may each be in communication with a different water storage tank.
The structure of the heating unit 3 will be described in detail below.
The heating unit 3 is mainly composed of an oven, and the first reservoir 103 and the second reservoir 104 of the injection unit 1 and the crack initiation unit 2 are placed in the oven for heating.
The configuration of the data processing and evaluation system 4 will be described in detail below.
The data processing and evaluation system 4 includes: a collecting device 401 corresponding to the fracture initiation unit 2 for collecting the liquid flowing out of the fracture initiation unit 2; a balance metering device 402 for weighing the collection device 401; and a processing terminal (not shown in figure 1) for analyzing and processing the data of the injection unit 1 and the fracture initiation unit 2 and evaluating the temporary plugging diversion fluid.
A check valve 6 for preventing the reverse flow of the liquid is provided at the inlet end of the collecting device 401.
A set of collecting devices 401 and balance metering devices 402 weigh the liquid (such as water, brine, temporary plugging diversion liquid) flowing out of one fracture initiation unit 2, so as to calculate the flow rate and flow velocity of the liquid in the fracture of the core. And transmitting the obtained data to a processing terminal, and evaluating the plugging performance of the temporary plugging steering fluid by combining the numerical value of the pressure sensor or the differential pressure sensor.
In another aspect of the present invention, the present invention provides a method for testing the performance of a temporary plugging diverting fluid for fracture acidizing, which comprises the following steps:
1) the heating unit 3 heats the injection unit 1 and the crack initiation unit 2 to a preset temperature;
2) injecting water between the clamp holder 203 of any crack initiation unit 2 and the ring-pressing rubber sleeve to form a ring-pressing seal;
3) the injection unit 1 injects water or saline water into the hole 2011, suppresses the pressure until the rock core is fractured, and continues injecting the water or the saline water until the flow rate of the water or the saline water in the fractured fracture is stable;
4) the injection unit 1 injects temporary plugging steering fluid into the hole 2011, and then injects water or the brine until the flow velocity of the water or the brine in the fracture of the plugged rock core 201 is stable;
5) and the data processing and evaluating system 4 collects the data of the injection unit 1 and the crack initiation unit 2, analyzes and processes the data and evaluates the performance of the temporary plugging steering fluid.
The preset temperature of the heating unit 3 for heating the injection unit 1 and the crack initiation unit 2 can be determined according to actual working conditions, and the preset temperature is usually not more than 177 ℃.
In practical application, the heating temperature of the heating unit 3 is 0-177 ℃, and the heating rate is 4-8 ℃/min.
The injection unit 1 may inject water or saline into the bore 2011 at a displacement of 0.1-1 mL/min.
Also, in practice, the pressure of the injection pump 102 is 0 to 105MPa, preferably 5 to 60 MPa; the injection flow rate is 0-107mL/min, preferably 0.5-20 mL/min. The injection flow rate as used herein refers to the flow rate of a liquid (water or brine, temporary plugging diversion liquid) before and after the core fracture.
In addition, in the test process, the ring crush on the core is kept to be larger than the pressure (injection pressure) at the inlet end of the core, so that water or saline in the crack can only flow out from the outlet end of the core and cannot flow out from between the core and the ring crush rubber sleeve, and the accuracy of the test result is ensured.
The brine used in the present invention may be a potassium chloride solution, preferably a 3% by mass potassium chloride solution. For water, the potassium chloride solution can prevent the expansion of substances such as clay in the rock, and the like, so that the test result of the influence of cracks on the temporary plugging steering fluid is reduced or even blocked.
For the cracks generated by the same rock core, after the pressure difference between two ends of the cracks is stable, namely the pressure difference is kept unchanged, the smaller the weight or flow of the collected liquid is, the better the plugging performance of the temporary plugging steering liquid is; after the flow rate of the liquid is stable, namely the flow rate is kept unchanged, the larger the pressure difference is, the better the plugging performance of the temporary plugging diversion liquid is.
According to the embodiment, the performance evaluation device and the test method of the temporary plugging diverting liquid for fracturing acidification provided by the invention are closer to the real fracture initiation state of natural rock in a stratum, so that the evaluation result of the temporary plugging diverting liquid is more real and reliable. Moreover, the blocking performance of the temporary blocking diverting liquid to rocks of different reservoirs can be simulated simultaneously.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a fracture acidizing is with stifled steering fluid performance evaluation device which characterized in that includes:
an injection unit (1), at least one crack initiation unit (2), a heating unit (3) and a data processing and evaluation system (4);
the injection unit (1) is used for injecting liquid into the crack initiation unit (2); the injection unit (1) comprises: the device comprises a water storage tank (101), an injection pump (102) and a ring pressure injection pump (105) which are connected with the water outlet end of the water storage tank (101), and a first liquid storage tank (103) and a second liquid storage tank (104) which are connected in parallel and connected with the water outlet end of the injection pump (102); the first reservoir (103) and the second reservoir (104) are each provided with a first chamber (1031; 1041) and a second chamber (1032; 1042) separated by a piston (1033; 1043); the second chambers (1032; 1042) being in communication with the infusion pumps (102), respectively; the second pressure sensor (205) is arranged on a connecting pipeline between the outlet end of the annular pressure injection pump (105) and the clamper (203), wherein the first chamber (1031) of the first liquid storage tank (103) contains water or saline; the second chamber (1032) of the first reservoir (103) contains water; the first chamber (1041) of the second liquid storage tank (104) contains temporary blocking steering fluid, and the second chamber (1042) of the second liquid storage tank (104) contains water;
the fracture initiation unit (2) comprises: the core (201) is provided with a hole (2011), a ring-crush rubber sleeve used for wrapping the core (201), a holder (203) used for holding the core (201) and the ring-crush rubber sleeve, a first pressure sensor (204) used for detecting the inlet end of the fracture initiation unit (2) and a second pressure sensor (205) used for detecting the internal pressure of the holder (203), or a differential pressure sensor (202) used for detecting the fracture initiation unit (2), and the ring-crush injection pump (105) injects the liquid into the space between the holder (203) and the ring-crush rubber sleeve and is used for forming a ring-crush seal between the holder (203) and the ring-crush rubber sleeve; the injection pump (102) injects water or saline water into the hole (2011) through the first liquid storage tank (103) and is used for suppressing pressure until the core (201) naturally cracks; the ring pressure on the core (201) is kept unchanged, the ring pressure on the core (201) is larger than the pressure at the inlet end of the core (201), a steel pipe for fixedly sealing the hole (2011) is arranged in the hole (2011), and the steel pipe and the hole wall are sealed by high-strength epoxy resin;
the heating unit (3) is used for heating the injection unit (1) and the crack initiation unit (2);
the data processing and evaluating system (4) is used for collecting data of the injection unit (1) and the crack initiation unit (2), analyzing and processing the data and evaluating the performance of the temporary blocking steering fluid.
2. The apparatus of claim 1, wherein the bore (2011) has an axial length 1/3-1/2 of an axial length of the core (201).
3. The apparatus according to claim 2, characterized in that the core (201) has an axial length of 7-20cm and a diameter of 2.5-5 cm; the diameter of the hole is 5-6.35 mm.
4. The apparatus according to claim 3, characterized in that the core (201) has an axial length of 13-17cm and a diameter of 3.8-5 cm.
5. The device according to claim 1, characterized in that the number of the fracture initiation units (2) is more than two, and each of the fracture initiation units (2) is connected in parallel.
6. The apparatus according to claim 1, characterized in that the data processing and evaluation system (4) comprises: a collecting device (401) corresponding to the fracture initiation unit (2) for collecting the liquid flowing out of the fracture initiation unit (2); a balance metering device (402) for weighing the collection device (401); and the processing terminal is used for analyzing and processing the data of the injection unit (1) and the fracture initiation unit (2) and evaluating the temporary plugging diversion fluid.
7. A method for testing the performance of temporary blocking steering fluid for fracture acidizing, which is characterized in that the device based on any one of claims 1 to 6 comprises the following steps:
1) the heating unit (3) heats the injection unit (1) and the crack initiation unit (2) to a preset temperature;
2) the injection unit (1) injects water between the clamp holder (203) of the crack initiation unit (2) and the ring-pressing rubber sleeve to form ring-pressing seal;
3) the injection unit (1) injects water or saline water into a hole (2011), suppresses pressure until a rock core is fractured, continues to inject water or saline water until the flow rate of the water or saline water in the fractured fracture is stable, the ring pressure on the rock core (201) is kept unchanged, the ring pressure on the rock core (201) is greater than the pressure at the inlet end of the rock core (201), a steel pipe for fixedly sealing the hole (2011) is arranged in the hole (2011), and the steel pipe and the hole wall are sealed by high-strength epoxy resin;
4) the injection unit (1) injects temporary plugging diversion fluid into the hole (2011), and then injects the water or the saline water until the flow rate of the water or the saline water in the fracture of the plugged rock core (201) is stable;
5) the data processing and evaluating system (4) collects data of the injection unit (1) and the crack initiation unit (2), analyzes and processes the data and evaluates the performance of the temporary plugging steering fluid.
8. The method according to claim 7, characterized in that the pressure of the injection unit (1) is 0-105MPa and the injection flow is 0-107 mL/min.
9. The method of claim 7, wherein the brine is a 3% by weight potassium chloride solution.
10. The method according to claim 7, characterized in that the heating temperature of the heating unit (3) is 0-177 ℃ and the ramp rate is 4-8 ℃/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611122702.2A CN108196002B (en) | 2016-12-08 | 2016-12-08 | Performance evaluation device and test method for temporary plugging steering fluid for fracture acidizing |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611122702.2A CN108196002B (en) | 2016-12-08 | 2016-12-08 | Performance evaluation device and test method for temporary plugging steering fluid for fracture acidizing |
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| CN108196002A CN108196002A (en) | 2018-06-22 |
| CN108196002B true CN108196002B (en) | 2021-06-01 |
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| CN111256961B (en) * | 2018-11-14 | 2022-02-01 | 中国石油天然气股份有限公司 | Device and method for evaluating performance of temporary plugging ball |
| CN111829730B (en) * | 2019-04-23 | 2023-01-10 | 中国石油化工股份有限公司 | Temporary plugging effect evaluation device and method |
| CN113092338A (en) * | 2021-04-09 | 2021-07-09 | 中国石油天然气股份有限公司 | Device and method for evaluating continuous plugging performance of diverting acid |
| CN113189278A (en) * | 2021-05-13 | 2021-07-30 | 中石化西南石油工程有限公司 | Temporary plugging agent evaluation device for multiple composite condition seams, holes and rock samples |
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