CN111101934B - Method for evaluating damage of fracturing modification on reservoir - Google Patents
Method for evaluating damage of fracturing modification on reservoir Download PDFInfo
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- CN111101934B CN111101934B CN201811180073.8A CN201811180073A CN111101934B CN 111101934 B CN111101934 B CN 111101934B CN 201811180073 A CN201811180073 A CN 201811180073A CN 111101934 B CN111101934 B CN 111101934B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
Abstract
A method for evaluating damage of fracturing modification on a reservoir stratum comprises the following steps: 1. manufacturing artificial cracks on the rock core; 2. filling a rubber pad in the artificial crack; 3. filling the rock core into a heating kettle; 4. according to the simulated well condition, axially and radially pressurizing and heating the rock core; 5. injecting gas to the bottom of the rock core to simulate a gas production process; collecting formation pressure and gas production parameters before fracturing modification; 6. stopping gas injection, pressurization and heating of the core; taking out the rubber pad in the artificial crack; laying a propping agent in the artificial fracture of the rock core; 7. putting the core into the heating kettle again; 8. according to the simulated well condition, axially and radially pressurizing and heating the rock core; 9. injecting gas to the bottom of the rock core to simulate a gas production process; pumping fracturing fluid into a shaft of the rock core in a circulating manner, and discharging the fracturing fluid in the rock core; collecting stratum pressure and gas production parameters after fracturing modification; 10. and evaluating the damage degree of the fracturing modification on the rock core through the formation pressure and the gas production rate before and after the fracturing modification.
Description
Technical Field
The invention relates to a damage analysis technology of fracturing modification on an oil and gas reservoir, in particular to a damage evaluation method of fracturing modification on a reservoir.
Background
The fracturing modification is an important technical measure for realizing yield increase in the development of oil and gas wells. However, in the process of fracturing modification, the fracturing fluid enters the stratum through the fracturing fracture to generate various physical and chemical reactions with reservoir rock or fluid and the like, so that different degrees of damage are generated to the oil and gas reservoir, and how to minimize the damage of the fracturing fluid to the reservoir is always the key point of the industry technology.
The technical measure for reducing the damage of the fracturing fluid to the reservoir mainly reflects on the compatibility of the fracturing fluid and the corresponding reservoir. Then, obtaining the compatibility of the fracturing fluid and the corresponding reservoir, the damage degree of the fracturing fluid to the corresponding reservoir needs to be studied, so as to guide the targeted preparation of the fracturing fluid and the adjustment of the subsequent fracturing process according to the specific reservoir. Therefore, the research on the damage degree of the fracturing fluid to the reservoir can provide important and reliable guide basis for the fracturing modification technology.
A conventional evaluation method for damage of a fracturing fluid to a reservoir mainly utilizes a change rule of core permeability to evaluate the damage degree of the fracturing fluid to the reservoir. However, in the actual working condition of fracturing modification of oil and gas wells, the change of permeability is not only influenced by pressure difference, but also related to a plurality of factors such as formation temperature, formation rock mass structure pressure and the like. Therefore, the evaluation method for evaluating the damage degree of the fracturing fluid to the reservoir by using the change rule of the core permeability has the technical problems of poor reliability, large evaluation result error and the like, and has no ideal guidance for the preparation of the fracturing fluid and the formulation of the fracturing process.
The Chinese patent document discloses a scientific research result of an applicant in the early stage, and is named as a simulated underground condition reservoir damage evaluation system (publication number CN 107559001, published 2018, 01, 09), and the damage of the drilling fluid to the reservoir is used as evaluation in the technology, so that the actual underground condition can be fully simulated and considered, and the damage degree of the drilling fluid to the reservoir can be truly and reliably evaluated. However, the technology only discloses the damage evaluation of the drilling fluid to the reservoir, and how to effectively evaluate the damage degree of the fracturing fluid to the reservoir is not further researched.
Based on the necessity of researching the evaluation of the damage degree of the fracturing fluid to the reservoir and the fact that the evaluation system can fully simulate and consider the actual underground condition, the evaluation system needs to research how to effectively and operationally evaluate the damage degree of the fracturing fluid to the reservoir by using the evaluation system on the basis of the evaluation system so as to effectively and reliably guide the preparation of the fracturing fluid and the formulation of the fracturing process by using the obtained evaluation result.
Disclosure of Invention
The technical purpose of the invention is as follows: aiming at the defects of the prior art, the method for evaluating damage to the reservoir stratum by fracturing reformation is convenient to operate, simple and easy to implement and accurate and reliable in obtained evaluation result on the basis of the evaluation system.
The technical scheme adopted by the invention for realizing the technical purpose is that the evaluation method for the damage of the fracturing modification to the reservoir is realized based on the following evaluation system, and the evaluation system comprises:
the heating kettle is provided with a kettle body with a hollow structure, a heating pipe is arranged inside the kettle body, the heating pipe of the heating kettle is connected with a temperature control instrument, a steel mesh permeation layer with a net structure and a rubber layer wrapping the steel mesh permeation layer are arranged in the hollow of the kettle body, an annular space gap is formed between the inner wall of the kettle body and the outer wall of the rubber layer, the steel mesh permeation layer is used for clamping a full-size rock core with a blind hole-shaped hollow structure, the rock core is clamped in the steel mesh permeation layer in a mode that an opening is upward and a bottom end is downward, and the hollow structure of the rock core clamped on the steel mesh permeation layer and the kettle body form a shaft;
a pore pressure adjusting mechanism, which mainly comprises a gas pressure stabilizer, a pressure gauge, a gas back pressure unit and a stop valve, which are connected to a circulation loop pipeline, wherein a gas flowmeter is connected to the gas back pressure unit, a gas supply pipeline of the circulation loop pipeline is connected to the bottom of the steel mesh permeation layer, a gas return pipeline is connected to a shaft of the heating kettle, and a nitrogen booster and a nitrogen bottle are connected to the gas pressure stabilizer;
the axial pressure stabilizing mechanism is arranged at the bottom of the kettle body and mainly comprises an axial pressure piston and an axial pressure measuring unit, and the axial pressure measuring unit is respectively arranged at the top and the bottom of the rock core;
the fracturing fluid circulating mechanism mainly comprises a liquid pressure stabilizer, a fracturing fluid circulating pump and a pressure gauge which are connected to a circulating loop pipeline, the circulating loop pipeline extends into a shaft of the heating kettle through the top end of the kettle body, and a liquid temperature control unit is connected to the liquid pressure stabilizer of the fracturing fluid circulating mechanism;
the confining pressure adjusting mechanism mainly comprises an oil tank, an electric booster pump, a stop valve and a pressure gauge which are connected to a pipeline, and the tail end of the pipeline of the confining pressure adjusting mechanism extends into an annular space of the heating kettle;
the evaluation method comprises the following process steps:
taking out the rubber pads filled in the artificial cracks on the rock core in the heating kettle;
laying a propping agent in the artificial fracture of the rock core;
step 7, the core is placed into the heating kettle again, and a steel mesh permeable layer and a rubber layer of the heating kettle are sequentially wrapped on the periphery of the core;
step 8, respectively restarting the axial pressure stabilizing mechanism, the confining pressure adjusting mechanism and the temperature control instrument of the heating kettle according to the simulated well condition, axially and radially pressurizing the core in the heating kettle according to a set value, and heating the core in the heating kettle according to the set value, so that the core in the heating kettle can feel the simulated real well condition;
step 9, starting the gap pressure adjusting mechanism again, injecting gas to the bottom of the rock core in the heating kettle, and simulating a gas production process;
starting a fracturing fluid circulating mechanism, circularly pumping fracturing fluid into a shaft of a rock core in a heating kettle for a period of time, closing the fracturing fluid circulating mechanism, and returning the fracturing fluid in the rock core;
collecting a stratum pressure parameter and a gas production parameter after fracturing modification;
and 10, comparing and analyzing formation pressure and gas production data before and after fracturing modification of the core in the heating kettle, and evaluating and analyzing the damage degree of the fracturing modification to the core in the heating kettle.
The highest regulating confining pressure of the confining pressure regulating mechanism is 90MPa.
The highest liquid column pressure of the fracturing liquid circulating mechanism is 60MPa.
The maximum controllable temperature of the temperature control instrument is 150 ℃.
The top and the bottom of the kettle body of the heating kettle are respectively connected with the upper end of the kettle body and the lower end of the kettle body, the upper end of the kettle body is axially provided with a through hole communicated with a shaft of the heating kettle, and the lower end of the kettle body is used for assembling an axial pressure piston of an axial pressure stabilizing mechanism; the upper end of the kettle body and the lower end of the kettle body are correspondingly connected with the upper end and the lower end of the rubber layer respectively; cauldron body upper end and cauldron body lower extreme respectively with the top of steel mesh permeable formation, bottom butt cooperation.
The liquid pressure stabilizer of the fracturing fluid circulating mechanism is connected with the gas pressure stabilizer of the pore pressure adjusting mechanism through a pipeline, and a stop valve is arranged on the pipeline.
The beneficial technical effects of the invention are as follows: the evaluation method is based on a simulated downhole condition reservoir damage evaluation system (with the publication number of CN 107559001, published 2018, 01, 09 and 09), so that actual downhole conditions are simulated and considered as really and fully as possible, namely, the process that fracturing fluid pollutes a reservoir under the factors of specific formation pressure, formation temperature and the like is simulated as really and fully as possible, the influence of the fracturing fluid on reservoir damage evaluation under the formation conditions and actual working conditions is considered more perfectly, the more real and reliable reservoir damage evaluation is effectively realized, the evaluation process is convenient and simple to operate, the obtained evaluation result is accurate and reliable, the reference value is high, and the evaluation method has an effective and reliable guiding effect on the fracturing modification of the reservoir.
Drawings
FIG. 1 is a schematic view of the structure of an evaluation system used in the present invention.
The reference numbers in the figures mean: 1-heating a kettle; 11-a kettle body; 12-the lower end of the kettle body; 13-the upper end of the kettle body; 14-heating a pipe; 15-a rubber layer; 16-steel mesh permeable layer; 17-a wellbore; 18-a temperature control instrument; 2, a rock core; 3-pore pressure regulating mechanism; 31-nitrogen cylinder; 32-nitrogen booster; 33-gas potentiostat; 34-a pressure relief valve; 35-pressure gauge; 36-gas back pressure unit; 37-a gas flow meter; 4-axial pressure stabilizing mechanism; 41-axial compression piston; 42-axial pressure measuring unit; 5, a fracturing fluid circulating mechanism; 51-liquid temperature control unit; 52-liquid potentiostat; 53-fracturing fluid circulating pump; 54-pressure gauge; 6, a confining pressure adjusting mechanism; 61-oil tank; 62-electric booster pump; 63-pressure gauge.
Detailed Description
The invention relates to a damage analysis technology of fracturing modification on an oil and gas reservoir, in particular to a damage evaluation method of fracturing modification on the reservoir, which is described in detail and concretely in the following with reference to an attached drawing of the specification, namely figure 1. It is specifically noted that the drawings of the present invention are schematic and that unnecessary details have been simplified for the purpose of clarity in order to avoid obscuring the technical solutions of the present invention that contribute to the prior art.
The invention relates to an evaluation method for damage to a reservoir stratum by fracturing reformation, which is realized on the basis of the following evaluation system.
Referring to fig. 1, the evaluation system adopted by the invention comprises a heating kettle 1, a pore pressure adjusting mechanism 3, an axial pressure stabilizing mechanism 4, a fracturing fluid circulating mechanism 5 and a confining pressure adjusting mechanism 6.
Wherein, the heating kettle 1 has a kettle body 11 with a hollow structure, namely, the kettle body 11 is a tubular structure. The heating pipes 14 are arranged in the circumferential direction of the inner part of the kettle body 11, the heating pipes 14 are connected with the temperature control instrument 18, and the action and the heating temperature of the heating pipes 14 are accurately controlled by the temperature control instrument 18, so that the formation high-temperature environment and the constant-temperature working environment with the temperature of about 150 ℃ at most can be simulated.
The top end of the kettle body 11 is connected with the upper end 13 of the kettle body; the body part of the upper end 13 of the kettle body is matched with the inner hole of the kettle body 11, a sealing connection structure, such as threaded connection, is arranged between the inner hole and the inner hole, and the inner end of the upper end 13 of the kettle body is of a conical structure; the kettle upper end 13 is fixedly connected with the top end of the kettle body 11 through a sealing connection structure, and the conical inner end of the kettle upper end 13 extends into the hollow of the kettle body 11; a through hole is arranged on the upper end 13 of the kettle body in the axial direction. The bottom end of the kettle body 11 is connected with a kettle body lower end 12; the body part of the lower end 12 of the kettle body is matched with the inner hole of the kettle body 11, a sealing connection structure, such as threaded connection, is arranged between the inner hole and the inner hole, and the inner end of the lower end 12 of the kettle body is of a conical structure; the lower end 12 of the kettle body is fixedly connected with the bottom end of the kettle body 11 through a sealing connection structure, and the conical inner end of the lower end 12 of the kettle body extends into the hollow of the kettle body 11; a through hole is arranged in the axial direction of the lower end 12 of the kettle body.
A steel mesh permeation layer 16 with a net structure is arranged in the hollow part of the kettle body 11 between the lower end 12 of the kettle body and the upper end 13 of the kettle body, and the upper end 13 of the kettle body and the lower end 12 of the kettle body are respectively matched with the top and the bottom of the steel mesh permeation layer 16 in an abutting mode; the steel mesh permeable layer 16 is used for clamping a rock core 2 with a blind hole-shaped hollow structure, the rock core 2 is a full-size hollow rock core, and the rock core 2 is clamped in the steel mesh permeable layer 16 in a mode that an opening (namely a hole end) faces upwards and a bottom end (namely a sealed bottom end) faces downwards; the hollow structure of the core 2 clamped on the steel mesh permeable layer 16 and the hollow of the kettle body 11, in particular the hollow of the upper end 13 of the kettle body, form a shaft 17. The rubber layer 15 is hermetically wrapped on the outer part of the steel mesh permeable layer 16 in the circumferential direction, the axial length of the rubber layer 15 is larger than that of the steel mesh permeable layer 16, and the upper end of the rubber layer 15 is sleeved on the conical structure at the upper end 13 of the kettle body, and the lower end of the rubber layer is sleeved on the conical structure at the lower end 12 of the kettle body; an annular space is formed between the outer wall of the rubber layer 15 and the inner wall of the kettle body 11. In order to facilitate the pipe connection, a guide pipe is arranged in the hollow part of the upper end 13 of the kettle body, the inner end of the guide pipe is abutted against the upper end of the core 2, and the outer end of the guide pipe extends out of the upper end 13 of the kettle body, namely, the hollow structure of the core 2 and the guide pipe in the upper end 13 of the kettle body jointly form a shaft 17.
The pore pressure adjusting mechanism 3 mainly comprises a gas pressure stabilizer 33 connected to the circulating loop pipeline, a pressure gauge 35, a gas back pressure unit 36 and two stop valves, wherein the two stop valves are respectively connected to a gas supply pipeline and a gas return pipeline of the circulating loop pipeline, namely, one stop valve is arranged on the gas supply pipeline at the downstream of the pressure gauge 35, the other stop valve is arranged on the gas return pipeline between the gas back pressure unit 36 and the gas pressure stabilizer 33, and the upstream of the gas pressure stabilizer 33 is sequentially connected with a nitrogen booster 32 and a nitrogen bottle 31. An air supply line of the circulation loop pipeline is connected to the bottom of the steel mesh permeable layer 16 through the lower end 13 of the kettle body, and an air source for inflating the steel mesh permeable layer 16 and the core 2 is simulated; the gas return line of the circulation circuit line is connected to the inside of the shaft 17 of the heating still 1. Further, a gas flowmeter 37 is connected to the gas back pressure unit 36; an intake-end pressure relief line led out from an air supply line upstream of the pressure gauge 35 is connected to the gas regulator 33, and a relief valve 34 is provided in the intake-end pressure relief line. The pore pressure adjusting mechanism 3 is used for simulating gas production change before and after reservoir damage.
The axial pressure stabilizing mechanism 4 is arranged at the bottom of the kettle body 11 and mainly comprises an axial pressure piston 41 and an axial pressure measuring unit 42. The axial compression piston 41 is axially sleeved in the hollow of the kettle body lower end 12, that is, the kettle body lower end 12 is used for assembling the axial compression piston 41, of course, a sleeve pipe should be attached to the hollow of the kettle body lower end 12, and the axial compression piston 41 is limited by the sleeve pipe; the axial pressure piston 41 is used for applying axial pressure to the bottom of the rock core 2, so that the axial pressure of the rock core 2 is ensured, and underground real conditions are simulated more truly. The axial pressure measuring units 42 are respectively arranged at the top and the bottom of the core 2 and used for detecting the pressure at the top and the bottom of the core 2.
The fracturing fluid circulating mechanism 5 mainly comprises a liquid pressure stabilizer 52 connected to a circulating loop pipeline, a fracturing fluid circulating pump 53 and a pressure gauge 54, wherein a liquid temperature control unit 51 and a fracturing fluid pool are connected to the liquid pressure stabilizer 52. And the circulating loop pipeline extends into a shaft 17 of the heating kettle 1 through a guide pipe at the upper end 13 of the kettle body and is used for pumping fracturing fluid into the hollow core 2 and ensuring that the fracturing fluid can be circulated and drained back.
The liquid pressure stabilizer 52 of the fracturing fluid circulation mechanism 5 is connected to the gas pressure stabilizer 33 of the pore pressure adjusting mechanism 3 through a pipeline, and a stop valve is arranged on the connecting pipeline of the gas pressure stabilizer and the pore pressure adjusting mechanism 3, so that the pore pressure adjusting mechanism 3 can deliver air pressure to the fracturing fluid circulation mechanism 5, and a fracturing fluid column with pressure, for example, the highest pressure of about 60MPa, can be simulated to enter the hollow of the rock core 2.
The confining pressure adjusting mechanism 6 mainly comprises an oil tank 61, an electric booster pump 62, a stop valve and a pressure gauge 63 which are sequentially connected with a pipeline. The tail end of the confining pressure adjusting mechanism 6 extends into the annular gap of the heating kettle 1 (namely the annular gap between the kettle body 11 and the rubber layer 15). The confining pressure regulating mechanism 6 is used for simulating a confining pressure environment under the stratum, for example, simulating a confining pressure working environment under the stratum of about 90MPa at most.
On the basis of the evaluation system, the method comprises the following process steps:
taking out the rubber pad filled in the artificial crack on the rock core 2 in the heating kettle 1;
laying a propping agent in the artificial fracture of the rock core 2;
step 7, the core 2 is placed into the heating kettle 1 again, and the steel mesh permeable layer 16 and the rubber layer 15 of the heating kettle 1 are sequentially wrapped on the periphery of the core 2;
step 8, respectively restarting the axial pressure stabilizing mechanism 4, the confining pressure adjusting mechanism 6 and the temperature control instrument 18 of the heating kettle 1 according to the simulated well conditions, axially and radially pressurizing the rock core 2 in the heating kettle 1 according to a set value, and heating the rock core 2 in the heating kettle 1 according to the set value, so that the rock core 2 in the heating kettle 1 can feel the simulated real well conditions;
step 9, starting the gap pressure adjusting mechanism 3 again, injecting gas to the bottom of the core 2 in the heating kettle 1, and simulating a gas production process;
starting the fracturing fluid circulating mechanism 5, circularly pumping the fracturing fluid into the shaft 17 of the core 2 in the heating kettle 1 for a period of time, closing the fracturing fluid circulating mechanism 5, and flowback the fracturing fluid in the core 2;
collecting a stratum pressure parameter and a gas production parameter after fracturing modification;
and 10, comparing and analyzing formation pressure and gas production data before and after fracturing modification of the core 2 in the heating kettle 1, and evaluating and analyzing the damage degree of the fracturing modification to the core 2 in the heating kettle 1.
The above specific technical solutions are only used to illustrate the present invention, but not to limit it; although the present invention has been described in detail with reference to the specific embodiments thereof, it will be understood by those skilled in the art that: the present invention may be modified and equivalents may be substituted for some of the features described above without departing from the spirit and scope of the present invention.
Claims (6)
1. A fracture reformation-to-reservoir damage evaluation method is realized based on the following evaluation system, and the evaluation system comprises the following components:
the heating kettle (1) is provided with a kettle body (11) of a hollow structure, a heating pipe (14) is arranged inside the kettle body (11), the heating pipe (14) of the heating kettle (1) is connected with a temperature control instrument (18), a steel mesh permeation layer (16) of a net structure and a rubber layer (15) wrapping the steel mesh permeation layer (16) are arranged in the hollow of the kettle body (11), an annular space is formed between the inner wall of the kettle body (11) and the outer wall of the rubber layer (15), the steel mesh permeation layer (16) is used for clamping a full-size rock core (2) of a blind hole-shaped hollow structure, the rock core (2) is clamped in the steel mesh permeation layer (16) in a mode that an opening is upward and a bottom end is downward, and the hollow structure of the rock core (2) clamped on the steel mesh permeation layer (16) and the kettle body (11) form a shaft (17);
-a pore pressure regulating mechanism (3), the pore pressure regulating mechanism (3) mainly comprises a gas pressure stabilizer (33) connected to a circulation loop pipeline, a first pressure gauge (35), a gas back pressure unit (36) and a stop valve, a gas flow meter (37) is connected to the gas back pressure unit (36), a gas supply pipeline of the circulation loop pipeline is connected to the bottom of the steel mesh permeation layer (16), a gas return pipeline is connected to a shaft (17) of the heating kettle (1), and a nitrogen booster (32) and a nitrogen bottle (31) are connected to the gas pressure stabilizer (33);
the axial pressure stabilizing mechanism (4) is arranged at the bottom of the kettle body (11), and mainly comprises an axial pressure piston (41) and an axial pressure measuring unit (42), wherein the axial pressure measuring unit (42) is respectively arranged at the top and the bottom of the rock core (2);
the fracturing fluid circulating mechanism (5) mainly comprises a liquid pressure stabilizer (52), a fracturing fluid circulating pump (53) and a pressure gauge II (54), wherein the liquid pressure stabilizer (52), the fracturing fluid circulating pump (53) and the pressure gauge II are connected to a circulating loop pipeline, the circulating loop pipeline extends into a shaft (17) of the heating kettle (1) through the top end of the kettle body (11), and a liquid temperature control unit (51) is connected to the liquid pressure stabilizer (52) of the fracturing fluid circulating mechanism (5);
-confining pressure adjusting mechanism (6), the confining pressure adjusting mechanism (6) mainly comprises an oil tank (61), an electric booster pump (62), a stop valve and a pressure gauge III (63) which are connected to a circulating loop pipeline, and the tail end of the circulating loop pipeline of the confining pressure adjusting mechanism (6) extends into the annular space of the heating kettle (1);
the method is characterized by comprising the following process steps:
step 1, manufacturing an artificial fracture along the radial direction of a rock core (2);
step 2, filling a rubber pad in the artificial crack of the rock core (2);
step 3, the core (2) is placed into the heating kettle (1), and a steel mesh permeable layer (16) and a rubber layer (15) of the heating kettle (1) are sequentially wrapped on the periphery of the core (2);
step 4, respectively starting the axial pressure stabilizing mechanism (4), the confining pressure adjusting mechanism (6) and the temperature control instrument (18) of the heating kettle (1) according to the simulated well conditions, axially and radially pressurizing the rock core (2) in the heating kettle (1) according to a set value, and heating the rock core (2) in the heating kettle (1) according to the set value, so that the rock core (2) in the heating kettle (1) can feel the simulated real well conditions;
step 5, starting the pore pressure adjusting mechanism (3), injecting and delivering gas to the bottom of the core (2) in the heating kettle (1), and simulating a gas production process; when the gas flow flowing through the rock core (2) tends to be stable, collecting formation pressure parameters and gas production parameters before fracturing modification;
step 6, closing the pore pressure adjusting mechanism (3), the axial pressure stabilizing mechanism (4), the confining pressure adjusting mechanism (6) and the temperature control instrument (18) of the heating kettle (1) respectively;
taking out the rubber pad filled in the artificial crack on the rock core (2) in the heating kettle (1);
laying a propping agent in the artificial fracture of the core (2);
step 7, the rock core (2) is filled into the heating kettle (1) again, and a steel mesh permeable layer (16) and a rubber layer (15) of the heating kettle (1) are sequentially wrapped on the periphery of the rock core (2);
step 8, respectively restarting the axial pressure stabilizing mechanism (4), the confining pressure adjusting mechanism (6) and the temperature control instrument (18) of the heating kettle (1) according to the simulated well conditions, axially and radially pressurizing the rock core (2) in the heating kettle (1) according to a set value, and heating the rock core (2) in the heating kettle (1) according to the set value, so that the rock core (2) in the heating kettle (1) can feel the simulated real well conditions;
step 9, starting the pore pressure adjusting mechanism (3) again, injecting gas to the bottom of the rock core (2) in the heating kettle (1), and simulating a gas production process;
starting a fracturing fluid circulating mechanism (5), circularly pumping fracturing fluid into a shaft (17) of a rock core (2) in a heating kettle (1) for a period of time, closing the fracturing fluid circulating mechanism (5), and flowback the fracturing fluid in the rock core (2);
collecting a stratum pressure parameter and a gas production parameter after fracturing modification;
and 10, comparing and analyzing formation pressure and gas production data before and after fracturing modification of the core (2) in the heating kettle (1), and evaluating and analyzing the damage degree of the fracturing modification to the core (2) in the heating kettle (1).
2. A method for evaluating damage to a reservoir stratum caused by fracturing reformation according to claim 1, wherein the maximum regulating confining pressure of the confining pressure regulating mechanism (6) is 90MPa.
3. A method for evaluating damage to a reservoir stratum caused by fracturing reformation according to claim 1, wherein the maximum liquid column pressure of the fracturing liquid circulating mechanism (5) is 60MPa.
4. A method for evaluating damage to a reservoir by fracture reformation according to claim 1, characterized in that the maximum controllable temperature of the temperature control instrument (18) is 150 ℃.
5. The method for evaluating the damage to the reservoir stratum caused by the fracturing reformation according to the claim 1, characterized in that the top and the bottom ends of the kettle body (11) of the heating kettle (1) are respectively connected with an upper kettle body end (13) and a lower kettle body end (12), the upper kettle body end (13) is axially provided with a through hole communicated with a shaft (17) of the heating kettle (1), and the lower kettle body end (12) is used for assembling an axial pressure piston (41) of an axial pressure stabilizing mechanism (4); the upper end (13) of the kettle body and the lower end (12) of the kettle body are correspondingly connected with the upper end and the lower end of the rubber layer (15) respectively; the kettle body upper end (13) and the kettle body lower end (12) are respectively matched with the top end and the bottom end of the steel mesh permeation layer (16) in an abutting mode.
6. The method for evaluating damage to the reservoir stratum caused by fracturing reformation according to claim 1, characterized in that a liquid pressure stabilizer (52) of the fracturing fluid circulation mechanism (5) is connected with a gas pressure stabilizer (33) of a pore pressure adjusting mechanism (3) through a pipeline, and a stop valve is arranged on the pipeline.
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| CN102817604A (en) * | 2012-08-28 | 2012-12-12 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | CO2 refracturing process technology for low-permeability gas well |
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| CN205670146U (en) * | 2016-06-14 | 2016-11-02 | 西南石油大学 | A kind of Fractured Gas Reservoir working solution damage appraisement device of simulation stratum condition |
| CN106153518A (en) * | 2016-06-22 | 2016-11-23 | 西南石油大学 | Compact sandstone gas reservoir fracturing liquid damage experimental evaluation method |
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| CN102817604A (en) * | 2012-08-28 | 2012-12-12 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | CO2 refracturing process technology for low-permeability gas well |
| CN105756674A (en) * | 2016-04-12 | 2016-07-13 | 西南石油大学 | Crack-substrate coupling flow damage evaluating device and method by simulating formation conditions |
| CN205670146U (en) * | 2016-06-14 | 2016-11-02 | 西南石油大学 | A kind of Fractured Gas Reservoir working solution damage appraisement device of simulation stratum condition |
| CN106153518A (en) * | 2016-06-22 | 2016-11-23 | 西南石油大学 | Compact sandstone gas reservoir fracturing liquid damage experimental evaluation method |
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