CN114459973A - Evaluation device and evaluation method for temporary plugging strength of temporary plugging agent - Google Patents
Evaluation device and evaluation method for temporary plugging strength of temporary plugging agent Download PDFInfo
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- 238000011156 evaluation Methods 0.000 title claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 103
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 230000001105 regulatory effect Effects 0.000 claims abstract description 55
- 239000011435 rock Substances 0.000 claims abstract description 39
- 230000035699 permeability Effects 0.000 claims abstract description 30
- 239000004576 sand Substances 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 10
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000000630 rising effect Effects 0.000 claims description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 238000010795 Steam Flooding Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 2
- 238000005496 tempering Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- ZRALSGWEFCBTJO-UHFFFAOYSA-N Guanidine Chemical compound NC(N)=N ZRALSGWEFCBTJO-UHFFFAOYSA-N 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000011256 inorganic filler Substances 0.000 description 2
- 229910003475 inorganic filler Inorganic materials 0.000 description 2
- 238000011545 laboratory measurement Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000002562 thickening agent Substances 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The invention discloses an evaluation device for temporary plugging strength of a temporary plugging agent, which comprises a liquid storage part, a flow regulator, a temperature regulating box, a rock core holder, an artificial rock core, a flow meter, a flow valve and an emptying valve, wherein the artificial rock core is arranged in the rock core holder, the rock core holder is arranged in the temperature regulating box, the evaluation device also comprises a power part, an inlet pressure gauge is arranged at the inlet of the artificial rock core, an outlet pressure gauge is arranged at the outlet of the artificial rock core, and the downstream of the rock core holder is connected with the flow meter. The temporary plugging strength of the temporary plugging agent under the conditions of temperature and pressure fluctuation is tested by setting different flow and temperature conditions and regulating the pressure fluctuation in the core holder by using the flow. Specifically, the flow can be counted through the flow meter, the pressure difference is calculated through the pressure gauge, the permeability of the temporary plugging agent before use is obtained through a formula, the flow is counted through the flow meter, the pressure difference is calculated through the pressure gauge, the permeability of the temporary plugging agent after use is obtained through the formula, and the temporary plugging strength of the temporary plugging agent is obtained through the formula.
Description
Technical Field
The invention relates to the technical field of petroleum engineering, in particular to a device and a method for evaluating temporary plugging strength of a temporary plugging agent.
Background
In the development of shale gas and shale oil, fracturing is widely required to improve the seepage capability of oil wells. An important ring in fracturing operation is to use temporary plugging agent to temporarily plug the high-permeability layer so as to achieve approximately equal liquid inlet amount of all layers. Under the actual working condition on site, the temporary plugging agent can generate different strength changes due to the fluctuation of temperature and pressure. In order to better analyze the strength of the temporary plugging agent and guide subsequent fracturing construction, experimental simulation needs to be carried out on site construction, and then the strength of the temporary plugging agent is tested.
The strength of the temporary plugging agent directly influences the temporary plugging performance and the oil well fracturing effect, so that the measurement work of the strength is particularly important. At present, the indoor experiment mainly adopts a steady-state test, and the strength change of the temporary plugging agent under a complex field working condition cannot be reflected.
The patent publication "CN 103788936A" relates to a high strength temporary plugging agent for oil and gas wells, its preparation and its application. The temporary plugging agent for the oil and gas well is mainly prepared from a thickening agent, a dispersing agent, an adhesive and a temperature-resistant material through a crosslinking reaction. The finally formed temporary plugging agent has high strength, forms a filter cake, has good solubility, is beneficial to flowback, and has simple method operation and controllable time. However, the patent only carries out a single group of temporary plugging agent experiments, does not carry out transverse control analysis, and cannot reflect that the pressure fluctuation is caused by the temporary plugging agent.
The patent with the publication number of 'CN 108956413A' discloses a temporary plugging strength performance evaluation method of a temporary plugging agent in a fracture for oil field fracturing.
The patent with publication number 'CN 109142151A' discloses an adhesion capability performance evaluation method of a temporary plugging agent for oilfield fracturing, which adopts a microcomputer control electronic universal testing machine and a fracturing construction well reservoir core to simulate the adhesion of the temporary plugging agent in a fracturing fracture according to basic data of fracturing construction, and provides corresponding test parameters and an evaluation method of the adhesion capability of the temporary plugging agent in the fracture.
A literature (Laiynanjun. performance evaluation of a water-soluble temporary fracturing plugging agent [ J ]. oilfield chemistry, 2014,31(02): 215-.
The research and performance evaluation of a high-strength composite temporary plugging agent [ J ] chemical engineer, 2013,27(11):46-49 ] in literature (Liuxiang) takes guanidine gum, inorganic filler, volume expansion particles and the like as raw materials to develop a novel composite temporary plugging agent. The influence of relevant factors on the performance of the composite temporary plugging agent system is investigated, and the plugging performance of the temporary plugging agent is tested through a core flow experiment. Experimental results show that when the mass fraction of the guanidine gum solution is 0.8%, the addition amount is 65%, the crosslinking ratio is 100:0.2, the addition amount of the bulk swelling particles is 0.6%, and the addition amount of the inorganic filler is 30%, the initial fluidity of the composite temporary plugging agent system is good, and the compressive strength is high after the plugging slug is formed.
In summary, the temporary plugging strength evaluation methods reported in the current documents and patents are mainly directed at the research of specific formulations and the application in actual fields, and no complete temporary plugging strength test system and evaluation method for temporary plugging agents exists. Because the rocks of different reservoirs have different characteristics, a universal conclusion cannot be obtained, and the actual requirements on the site are difficult to meet.
Therefore, the existing evaluation method for the temporary plugging strength of the temporary plugging agent has a large rising space. An accurate and simple temporary plugging strength evaluation method of the temporary plugging agent will undoubtedly have positive influence on the current fracturing construction, and the temporary plugging agent more suitable for the target reservoir stratum is preferably selected. The optimal temporary plugging agent suitable for the reservoir can be fractured to form more complex fractures, so that the aims of improving the recovery efficiency and improving the economic benefit are fulfilled.
Disclosure of Invention
The invention provides an evaluation device and an evaluation method for temporary plugging strength of a temporary plugging agent under the actual working condition by simulation.
The technical scheme of the device for evaluating the temporary plugging strength of the temporary plugging agent provided by the invention is as follows:
the device for evaluating the temporary plugging strength of the temporary plugging agent comprises a liquid storage part, wherein the liquid storage part is used for storing a first solution or a second solution, the first solution is a liquid without the temporary plugging agent, the second solution is a liquid containing the temporary plugging agent, the device further comprises a flow regulator, a temperature regulating box, a rock core holder, an artificial rock core, a flow meter, a flow valve and an air release valve, the artificial rock core is arranged in the rock core holder, the rock core holder is arranged in the temperature regulating box capable of regulating the temperature in the temperature regulating box to a preset temperature value, the liquid storage part is connected with the rock core holder through a pipeline provided with a valve, the pipeline is provided with the flow regulator capable of regulating the flow of the liquid passing through the pipeline to the preset flow value, the device further comprises a power part which is communicated with the liquid storage part through a pipeline and provides power for the first solution or the second solution to enable the first solution or the second solution to flow, along the liquid flow direction, the inlet of artificial rock core sets up the import manometer, the exit sets up the export manometer, form two branch pipelines on the pipeline of rock core holder's the downstream, a branch pipeline is connected and is used for measuring the flow flowmeter and be equipped with on this branch pipeline the flow valve, be equipped with on another branch pipeline the atmospheric valve.
Preferably, the core holder further comprises a temperature stabilizing circulation container, and the temperature stabilizing circulation container is located upstream of the core holder and in the temperature regulating box.
Preferably, the power unit is a constant-flow pump, the flow rate regulator is connected to the constant-flow pump, and the flow rate regulator adjusts the liquid flow rate by adjusting the opening degree of the constant-flow pump.
Preferably, the flow regulator is provided with a flow signal emitter, the temperature regulating box is provided with a temperature signal emitter, the temperature regulating device further comprises a computer, and the computer is internally provided with a flow signal receiver corresponding to the flow signal emitter and a temperature signal receiver corresponding to the temperature signal emitter.
Preferably, the apparatus further comprises a rotational viscometer for measuring the viscosity of the first solution and/or the viscosity of the second solution.
Preferably, the temperature regulating tank is a non-isothermal steam flooding thermostat.
The evaluation device for the temporary plugging strength of the temporary plugging agent provided by the invention has the following beneficial effects:
the flow regulator in the evaluation device is used for regulating the liquid flow in the pipeline, the temperature regulating box is used for regulating the temperature, and therefore the temporary plugging strength of the temporary plugging agent under the conditions of temperature and pressure fluctuation is tested by setting different flow and temperature conditions and regulating the pressure fluctuation in the core holder by using the flow. Specifically, the flowmeter that the accessible set up statistics the flow of first solution to calculate pressure differential with the manometer, reachs the permeability before the use of temporary plugging agent through the formula, and equally, utilize the device, through the flowmeter statistics the flow of second solution that sets up, calculate pressure differential with the manometer, reachs the permeability after the use of temporary plugging agent through the formula, and then reachs the temporary plugging intensity of temporary plugging agent through the formula again.
Preferably, a temperature stabilizing circulation vessel is provided to ensure that the temperature is a continuously variable temperature.
Preferably, the computer controls the temperature regulating box and the flow regulator, so that test parameters can be automatically obtained, and errors caused by manual operation are avoided.
The invention also provides an evaluation method of the temporary plugging strength of the temporary plugging agent, which comprises the following steps:
a. providing an evaluation device of the temporary plugging strength of the temporary plugging agent;
b. opening the temperature regulating box, setting an initial temperature through the temperature regulating box, setting a preset fluctuation temperature value as a temperature rising gradient caused by fracturing during site construction, and regulating the temperature in the temperature regulating box by the temperature regulating box according to the preset fluctuation temperature value; starting the flow regulator, setting an initial flow value through the flow regulator, setting a preset flow fluctuation value as a flow rising gradient during construction fracturing, and adjusting the liquid flow by the flow regulator according to the preset flow fluctuation value; measuring the length L and the sectional area A of the artificial rock core;
c. calculation of the permeability of the temporary plugging agent before use:
c1. the first solution is configured in the liquid storage part, and the valve and the power part are opened to enable the first solution to flow out of the liquid storage part;
c2. opening the flow valve and closing the emptying valve;
c3. time t1Measuring the flow rate Q of the first solution permeating the artificial core by the flowmeter1Obtaining a pressure difference value delta P through the reading of the inlet pressure gauge and the outlet pressure gauge1Obtaining the viscosity of the first solution as mu 1; after the completion, closing the flow valve and opening the emptying valve to empty the first solution;
c4. the permeability K of the temporary plugging agent before use is obtained by the following formula1Comprises the following steps:
in the formula, K1The unit of (a) is D,flow rate Q1In units of cm3Mu.1 in mPas, L in cm, t1In units of s and A in units of cm2,△P1Has the unit of atm.
d. Calculation of the permeability of the temporary plugging agent after use:
d1. the second solution is configured in the liquid storage part, and the valve and the power part are opened to enable the second solution to flow out of the liquid storage part;
d2. opening the flow valve and closing the emptying valve;
d3. time t2Measuring the flow rate Q of the second solution permeating the artificial core by the flowmeter2Obtaining the viscosity of the second solution as mu2Time t2In the method, starting from zero time and every time t3A time t is obtained from the reading of the inlet pressure gauge and the outlet pressure gauge3Internal pressure difference Δ PiAnd given each time t3The mean value of the fluctuation of the internal pressure difference is DeltaPxThe time t is obtained by the following formula2Average value of pressure difference therein:
in the formula, the unit of the pressure difference average value is atm, the unit of the pressure difference value and the pressure difference value fluctuation average value is atm, t2And t3The unit of (d) is s.
Then the permeability K of the temporary plugging agent after use is obtained by the following formula2Comprises the following steps:
in the formula, K2Has the unit of D, the flow rate Q2In units of cm3Mu.2 in mPas, L in cm, t2In units of s and A in units of cm2。
e. The temporary plugging strength E of the temporary plugging agent is obtained by the following formula:
preferably, in step a:
and selecting the on-site fracturing sand laying concentration, converting the on-site fracturing sand laying concentration into the laboratory sand laying concentration through a formula or by utilizing experience, and laying sand on the artificial rock core.
Preferably, in step a: and providing an evaluation device for the temporary plugging strength of the temporary plugging agent with the temperature-stabilizing circulating container, wherein in the subsequent step, before liquid is introduced into the core holder, the liquid firstly passes through the temperature-stabilizing circulating container.
Preferably, in step a: and in the subsequent steps, the computer controls the temperature regulating box and the flow regulator, and the computer sets the preset fluctuation temperature value and the preset flow fluctuation value.
The method for evaluating the temporary plugging strength of the temporary plugging agent provided by the invention adopts the device for evaluation, so that the same technical effects are achieved.
Meanwhile, the evaluation method can determine the initial pressure value, the initial temperature value and the initial flow value of the fracturing layer of the construction site; the viscosity of the first solution or the second solution can also be calculated by laboratory measurements; simulating the permeability change condition under the actual working condition, and obtaining the permeability K before using the plugging agent1Permeability K after use of blocking agent2(ii) a And calculating the permeability difference before and after plugging, and comprehensively optimizing and evaluating the permeability difference before and after plugging on the basis of comparing the average pressure of two tests through a certain model so as to evaluate the temporary plugging strength of the temporary plugging agent.
Drawings
Fig. 1 is a schematic structural diagram of a specific embodiment of an apparatus for evaluating temporary plugging strength of a temporary plugging agent provided by the present invention.
The reference numerals in fig. 1 are as follows:
the system comprises a liquid storage part 1, a flow regulator 2, a temperature regulating box 3, a rock core holder 4, a flowmeter 5, a flow rate valve 6, an air release valve 7, an inlet pressure gauge 8, an outlet pressure gauge 9, a temperature stabilizing circulation container 10, a constant flow pump 11 and a computer 12.
Detailed Description
As shown in fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an evaluation apparatus for temporary plugging strength of a temporary plugging agent provided by the present invention.
Referring to fig. 1, an evaluation device for temporary plugging strength of a temporary plugging agent comprises a liquid storage part 1, wherein the liquid storage part 1 is used for storing a first solution or a second solution, the first solution is a liquid not containing the temporary plugging agent, the second solution is a liquid containing the temporary plugging agent, the evaluation device further comprises a flow regulator 2, a temperature regulating box 3, a core holder 4, an artificial core, a flow meter 5, a flow valve 6 and an air release valve 7, the artificial core is arranged in the core holder 4, the core holder 4 is arranged in the temperature regulating box 3 capable of regulating the temperature in the temperature regulating box 3 to a preset temperature value, the liquid storage part 1 is connected with the core holder 4 through a pipeline provided with a valve, the pipeline is provided with the flow regulator 2 capable of regulating the liquid flow passing through the pipeline to a preset flow value, the evaluation device further comprises a power part communicated with the liquid storage part 1 through the pipeline and providing power for the first solution or the second solution to flow, along the liquid flow direction, an inlet pressure gauge 8 is arranged at the inlet of the artificial rock core, an outlet pressure gauge 9 is arranged at the outlet of the artificial rock core, two branch pipelines are formed on the downstream pipeline of the rock core holder 4, one branch pipeline is connected with the flow meter 5 for measuring the flow, the flow valve 6 is arranged on the branch pipeline, and the emptying valve 7 is arranged on the other branch pipeline.
The flow regulator 2 in the evaluation device is used for regulating the liquid flow in the pipeline, the temperature regulating box 3 is used for regulating the temperature, and therefore the temporary plugging strength of the temporary plugging agent under the conditions of temperature and pressure fluctuation is tested by setting different flow and temperature conditions and regulating the pressure fluctuation in the core holder 4 by using the flow. Specifically, the flow of the first solution is counted to the flowmeter 5 that the accessible set up to calculate pressure differential with the manometer, reachs the permeability before the use of temporary plugging agent through the formula, and similarly, utilize the device, through the flowmeter 5 statistics flow of second solution that sets up, calculate pressure differential with the manometer, reachs the permeability after the use of temporary plugging agent through the formula, and then reachs the temporary plugging strength of temporary plugging agent through the formula again.
In one embodiment, as shown in fig. 1, a temperature stabilizing circulation vessel 10 is further included, and the temperature stabilizing circulation vessel 10 is located upstream of the core holder 4 and within the tempering tank 3.
A temperature stabilizing circulation vessel 10 is provided to ensure a continuously variable temperature.
Further, as shown in fig. 1, the power unit is a constant flow pump 11, the constant flow pump 11 is connected to the flow rate controller 2, and the flow rate controller 2 adjusts the liquid flow rate by adjusting the opening degree of the constant flow pump 11.
In this specific embodiment, a flow signal transmitter is arranged on the flow regulator 2, a temperature signal transmitter is arranged on the temperature regulating box 3, and the flow regulating device further comprises a computer 12, and a flow signal receiver corresponding to the flow signal transmitter and a temperature signal receiver corresponding to the temperature signal transmitter are arranged in the computer 12. In addition, a temperature regulator arranged on the temperature regulating box 3 can be arranged for regulating the temperature, a temperature signal emitter is arranged on the temperature regulator,
the computer 12 controls the temperature regulating box 3 and the flow regulator 2, so that test parameters can be automatically obtained, and errors caused by manual operation are avoided.
Further, a rotational viscometer for measuring the viscosity of the first solution and/or the viscosity of the second solution is also included. In the specific embodiment, the temperature regulating tank 3 is a non-isothermal steam flooding thermostat.
The invention also provides an evaluation method of the temporary plugging strength of the temporary plugging agent, which comprises the following steps:
a. providing an evaluation device of the temporary plugging strength of the temporary plugging agent;
b. starting a temperature regulating box 3, setting an initial temperature through the temperature regulating box 3, setting a preset fluctuation temperature value as a temperature rising gradient caused by fracturing in site construction, and regulating the temperature in the temperature regulating box 3 by the temperature regulating box 3 according to the preset fluctuation temperature value; starting the flow regulator 2, setting an initial flow value through the flow regulator 2, setting a preset flow fluctuation value as a flow rising gradient during construction fracturing, and adjusting the liquid flow by the flow regulator 2 according to the preset flow fluctuation value; measuring the length L and the sectional area A of the artificial rock core;
c. calculation of the permeability of the temporary plugging agent before use:
c1. the first solution is configured in the liquid storage part 1, and the valve and the power part are opened to enable the first solution to flow out of the liquid storage part 1;
c2. opening the flow valve 6 and closing the emptying valve 7;
c3. time t1Measuring the flow rate Q of the first solution permeating the artificial core by the flowmeter 51Obtaining a pressure difference value delta P through the reading of the inlet pressure gauge 8 and the reading of the outlet pressure gauge 91Obtaining the viscosity of the first solution as mu 1; after completion, closing the flow valve 6 and opening the emptying valve 7 to empty the first solution;
c4. the permeability K of the temporary plugging agent before use is obtained by the following formula1Comprises the following steps:
in the formula, K1Has the unit of D, the flow rate Q1In units of cm3Mu.1 in mPas, L in cm, t1In units of s and A in units of cm2,△P1Has the unit of atm.
d. Calculation of the permeability of the temporary plugging agent after use:
d1. the second solution is configured in the liquid storage part 1, and the valve and the power part are opened to make the second solution flow out of the liquid storage part 1;
d2. opening the flow valve 6 and closing the emptying valve 7;
d3. time t2In that the person is measured out of the permeate by the flow meter 5Flow rate Q of the second solution of the core2Obtaining the viscosity of the second solution as mu2Time t2In the method, starting from zero time and every time t3A time t is obtained from the reading of the inlet pressure gauge and the outlet pressure gauge3Internal pressure difference Δ PiAnd given each time t3The mean value of the fluctuation of the internal pressure difference is DeltaPxThe time t is obtained by the following formula2Average value of pressure difference therein:
in the formula, the unit of the pressure difference average value is atm, the unit of the pressure difference value and the pressure difference value fluctuation average value is atm, t2And t3The unit of (d) is s.
Then the permeability K of the temporary plugging agent after use is obtained by the following formula2Comprises the following steps:
in the formula, K2Has the unit of D, the flow rate Q2In units of cm3Mu.2 in mPas, L in cm, t2In units of s and A in units of cm2。
e. The temporary plugging strength E of the temporary plugging agent is obtained by the following formula:
the evaluation method can determine the initial pressure value, the initial temperature value and the initial flow value of the fracturing layer of the construction site; the viscosity of the first solution or the second solution can also be calculated by laboratory measurements; simulating the permeability change condition under the actual working condition, and obtaining the permeability K before using the plugging agent1Permeability K after use of blocking agent2(ii) a Calculating the permeability before and after pluggingAnd (4) evaluating the permeability difference before and after plugging by comprehensively optimizing the difference on the basis of comparing the average pressure of two tests through a certain model, and further evaluating the temporary plugging strength of the temporary plugging agent. Similarly, the evaluation device provided by the invention has the same technical effects.
Further, in step a:
and selecting the on-site fracturing sand laying concentration, converting the on-site fracturing sand laying concentration into the laboratory sand laying concentration through a formula or by utilizing experience, and laying sand on the artificial rock core. The field is simulated, and the evaluation accuracy is improved.
Further, in step a: and providing an evaluation device for the temporary plugging strength of the temporary plugging agent with the temperature-stabilizing circulation container 10, wherein in the subsequent step, before liquid is introduced into the core holder 4, the liquid firstly passes through the temperature-stabilizing circulation container 10.
Further, in step a: if the above evaluation device for temporary plugging strength of the temporary plugging agent with the computer 12 is provided, in the subsequent steps, the temperature adjusting tank 3 and the flow rate adjusting instrument 2 are controlled by the computer 12, and the preset fluctuation temperature value and the preset flow rate fluctuation value are set by the computer 12.
The following is a specific embodiment of evaluating the strength of the temporary plugging agent by using the evaluation device and the evaluation method provided above, and includes the following steps:
a. providing an evaluation apparatus as shown in fig. 1:
placing the core holder 4 and the temperature-stabilizing circulation container 10 in a non-isothermal steam flooding thermostat;
installing a temperature regulator with a temperature signal transmitter on a non-isothermal steam flooding thermostat;
installing a flow regulator 2 with a flow signal emitter on the constant flow pump 11;
arranging a vent valve 7 and a flow valve 6 to facilitate subsequent pressure regulation;
the selected on-site fracturing sand laying concentration is converted into the laboratory sand laying concentration through a formula, and the optimized on-site fracturing sand laying concentration is 9.76kg/m3；
The flow regulator 2 with a flow signal emitter on the constant flow pump 11 and the temperature regulator with a temperature signal emitter on the non-isothermal steam flooding thermostat are connected with the computer 12, and the operation is controlled by a computer program.
b. Setting the initial temperature to be 20 ℃ and setting the fluctuation temperature value to be 0.03 ℃/s of temperature rise gradient caused by fracturing during site construction through the computer 12; adjusting the flow output of the constant flow pump 11 to be 10ml/min, and setting the flow fluctuation value to be 3ml/min of gradient of flow rising during construction fracturing; before liquid is introduced into the core holder 4, a temperature-stabilizing circulating container 10 is introduced; the length L of the artificial core was 5.82cm and the cross-sectional area A of the core was 5.07cm, as measured with a vernier caliper2(ii) a And paving sand on the artificial rock core, and clamping the artificial rock core of the fracturing block in the rock core holder.
c. Calculation of the permeability of the temporary plugging agent before use:
a first solution is configured in the liquid storage part 1, and a valve and a constant flow pump 11 are opened to make the first solution flow out of the liquid storage part 1;
opening the flow valve 6, closing the emptying valve 7, and adjusting the outlet pressure to be 0.1 MPa;
setting a program on the computer 12 to control the whole equipment to start to operate, and measuring the flow at the outlet end, namely the flow permeating the artificial rock core under the conditions that the temperature is 20 ℃ and the flow is 10 ml/min;
measuring flow change of 0.17cm3(ii)/s, and pressure change in core holder 4 of 0.16atm, repeat the measurement for 10 minutes;
measuring the viscosity of the fracturing fluid at an outlet by using a rotary viscometer to be 5.17 mPa.s;
the permeability before the temporary plugging agent is used is calculated by the following formula:
in the formula: k1-permeability before use of the temporary plugging agent 6.31D;
Q1/t1volume of liquid flowing out on average within 10 minutes of 0.17cm3/s；
μ 1-viscosity 5.17 mpa.s;
l represents the length of the artificial core is 5.82 cm;
a-sectional area of artificial core 5.07cm2；
△P1-pressure differential 0.16atm before and after the core holder;
d. calculation of the permeability of the temporary plugging agent after use:
metering every 5 seconds (t)3) And the pressure difference (greater than 10atm) in the core holder 4, the average value of the pressure difference being expressed as
The measurement was repeated for 10 minutes;
measuring the viscosity of the fracturing fluid at an outlet by using a rotary viscometer to be mu 2;
calculating the average value of the pressure difference:
in the formula:
-mean differential pressure over total time 18.78 atm;
△Pi-an initial value of the pressure difference at the beginning of metering every 5 seconds of 6.78atm (variable);
△Px-mean value of differential pressure fluctuations 0.04atm (given) in each 5 seconds;
t2-measuring time 600 s;
the permeability after the use of the temporary plugging agent was calculated by the following formula:
K2permeability after use of the temporary plugging agent 0.15D;
Q2-sum of flow rates of 230.40cm3；
μ 2-viscosity 6.32 mpa.s;
l is the length of the core is 5.82 cm;
t2-measuring time 600 s;
a-the sectional area of the core is 5.07cm2；
e. calculating the temporary plugging strength of the temporary plugging agent; the formula is as follows:
e-temporary plugging strength 96.79%;
K1-permeability before use of the temporary plugging agent 6.31D;
K2-permeability after use of the temporary plugging agent 0.15D;
△P1pressure differential of 0.16atm before and after the core holder before the use of the temporary plugging agent.
Claims (10)
1. The device for evaluating the temporary plugging strength of the temporary plugging agent is characterized by comprising a liquid storage part, a flow regulator, a temperature regulating box, a rock core holder, an artificial rock core, a flow meter, a flow valve and an emptying valve, wherein the liquid storage part is used for storing a first solution or a second solution, the first solution is a liquid without the temporary plugging agent, the second solution is a liquid containing the temporary plugging agent, the artificial rock core is arranged in the rock core holder, the rock core holder is arranged in the temperature regulating box capable of regulating the temperature in the temperature regulating box to a preset temperature value, the liquid storage part is connected with the rock core holder through a pipeline provided with a valve, the pipeline is provided with the flow regulator capable of regulating the flow of liquid passing through the pipeline to a preset flow value, the liquid storage part is communicated through the pipeline and provides power for the first solution or the second solution to enable the first solution or the second solution to flow, along the liquid flow direction, the inlet of artificial rock core sets up the import manometer, the exit sets up the export manometer, form two branch pipelines on the pipeline of rock core holder's the downstream, a branch pipeline is connected and is used for measuring the flow flowmeter and be equipped with on this branch pipeline the flow valve, be equipped with on another branch pipeline the atmospheric valve.
2. The apparatus according to claim 1, further comprising a temperature-stabilizing circulation vessel located upstream of the core holder and within the tempering tank.
3. The apparatus according to claim 2, wherein the power unit is a constant flow pump, the flow rate regulator is connected to the constant flow pump, and the flow rate regulator adjusts the liquid flow rate by adjusting an opening degree of the constant flow pump.
4. The device for evaluating the temporary plugging strength of the temporary plugging agent according to claim 3, wherein a flow signal emitter is arranged on the flow regulator, a temperature signal emitter is arranged on the temperature regulating tank, and the device further comprises a computer, wherein a flow signal receiver corresponding to the flow signal emitter and a temperature signal receiver corresponding to the temperature signal emitter are arranged in the computer.
5. The apparatus for evaluating the temporary plugging strength of the temporary plugging agent according to claim 1, further comprising a rotational viscometer for measuring the viscosity of said first solution and/or the viscosity of said second solution.
6. The apparatus according to claim 1, wherein the temperature-regulating tank is a non-isothermal steam flooding thermostat.
7. The method for evaluating the temporary plugging strength of the temporary plugging agent is characterized by comprising the following steps of:
a. providing an evaluation device of the temporary plugging strength of the temporary plugging agent according to any one of claims 1 to 6;
b. opening the temperature regulating box, setting an initial temperature through the temperature regulating box, setting a preset fluctuation temperature value as a temperature rising gradient caused by fracturing during site construction, and regulating the temperature in the temperature regulating box by the temperature regulating box according to the preset fluctuation temperature value; starting the flow regulator, setting an initial flow value through the flow regulator, setting a preset flow fluctuation value as a flow rising gradient during construction fracturing, and adjusting the liquid flow by the flow regulator according to the preset flow fluctuation value; measuring the length L and the sectional area A of the artificial rock core;
c. calculation of permeability of the temporary plugging agent before use:
c1. the first solution is configured in the liquid storage part, and the valve and the power part are opened to enable the first solution to flow out of the liquid storage part;
c2. opening the flow valve and closing the emptying valve;
c3. time t1Measuring the flow rate Q of the first solution permeating the artificial core by the flowmeter1Obtaining a pressure difference value delta P through the reading of the inlet pressure gauge and the outlet pressure gauge1Obtaining the viscosity of the first solution as mu1(ii) a After the completion, closing the flow valve and opening the emptying valve to empty the first solution;
c4. the permeability K of the temporary plugging agent before use is obtained by the following formula1Comprises the following steps:
in the formula, the first and second images are shown,K1has the unit of D, the flow rate Q1In units of cm3，μ1In units of mPas, L in units of cm, t1In units of s and A in units of cm2,△P1Has the unit of atm;
d. calculation of the permeability of the temporary plugging agent after use:
d1. the second solution is configured in the liquid storage part, and the valve and the power part are opened to enable the second solution to flow out of the liquid storage part;
d2. opening the flow valve and closing the emptying valve;
d3. time t2Measuring the flow rate Q of the second solution permeating the artificial core by the flowmeter2Obtaining the viscosity of the second solution as mu2Time t2In the method, starting from zero time and every time t3A time t is obtained from the reading of the inlet pressure gauge and the outlet pressure gauge3Internal pressure difference Δ PiAnd given each time t3The mean value of the fluctuation of the internal pressure difference is DeltaPxThe time t is obtained by the following formula2Average value of pressure difference therein:
in the formula, the unit of the pressure difference average value is atm, the unit of the pressure difference value and the pressure difference value fluctuation average value is atm, t2And t3The unit of (a) is s;
then the permeability K of the temporary plugging agent after use is obtained by the following formula2Comprises the following steps:
in the formula, K2Has the unit of D, the flow rate Q2In units of cm3，μ2In units of mPas, L in units of cm, t2Has the unit s, AUnit is cm2；
e. The temporary plugging strength E of the temporary plugging agent is obtained by the following formula:
8. the method for evaluating the temporary plugging strength of the temporary plugging agent according to claim 7, wherein in the step a:
and selecting the on-site fracturing sand laying concentration, converting the on-site fracturing sand laying concentration into the laboratory sand laying concentration through a formula or by utilizing experience, and laying sand on the artificial rock core.
9. The method for evaluating the temporary plugging strength of the temporary plugging agent according to claim 7, wherein in the step a: providing the apparatus for evaluating the temporary plugging strength of the temporary plugging agent according to claim 2, wherein in the subsequent step, before the liquid is introduced into the core holder, the liquid passes through the temperature stabilizing circulation container.
10. The method for evaluating the temporary plugging strength of the temporary plugging agent according to claim 7, wherein in the step a: providing the apparatus for evaluating the temporary plugging strength of a temporary plugging agent according to claim 4, wherein in the subsequent step, the temperature-adjusting tank and the flow regulator are controlled by the computer, and the preset fluctuation temperature value and the preset flow fluctuation value are set by the computer.
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| CN116380752A (en) * | 2023-06-05 | 2023-07-04 | 成都理工大学 | Evaluation method for shielding effect of degradable sinking agent artificial interlayer |
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