CN111350482B - Experimental device and method for repairing reservoir guar gum fracturing damage by microorganisms - Google Patents
Experimental device and method for repairing reservoir guar gum fracturing damage by microorganisms Download PDFInfo
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- 230000006378 damage Effects 0.000 title claims abstract description 79
- 244000005700 microbiome Species 0.000 title claims abstract description 43
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- 229920002907 Guar gum Polymers 0.000 title abstract description 8
- 229960002154 guar gum Drugs 0.000 title abstract description 8
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- 239000012530 fluid Substances 0.000 claims abstract description 102
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- CHJJGSNFBQVOTG-UHFFFAOYSA-N N-methyl-guanidine Natural products CNC(N)=N CHJJGSNFBQVOTG-UHFFFAOYSA-N 0.000 claims abstract description 44
- SWSQBOPZIKWTGO-UHFFFAOYSA-N dimethylaminoamidine Natural products CN(C)C(N)=N SWSQBOPZIKWTGO-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000000813 microbial effect Effects 0.000 claims abstract description 28
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
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- 238000002347 injection Methods 0.000 claims abstract description 13
- 239000007924 injection Substances 0.000 claims abstract description 13
- 238000005086 pumping Methods 0.000 claims abstract description 6
- 238000003860 storage Methods 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 29
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- 238000004088 simulation Methods 0.000 claims description 17
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
The invention provides an experimental device and method for repairing reservoir guar gum fracturing damage by microorganisms, which comprises an injection and vacuum-pumping system, a reaction system storage system, a microorganism repairing reservoir fracturing fluid damage reaction system, a data and sample acquisition system, wherein different reservoir guar gum fracturing fluid damage types are simulated through different injection modes and reaction conditions, pressure detection of different positions of a simulated fracturing reservoir is realized through pressure sensors distributed at different positions of a model, so that the pressure field distribution of the simulated reservoir in a fracturing fluid damage process and a microorganism repairing fracturing fluid damage process is constructed, produced fluid is separated and detected through samplers at different positions, and the prediction of the damage pollution degree and range of the reservoir fracturing fluid and the damage effect prediction of the microorganism repairing fracturing fluid are realized. By a method combining experimental measurement and quantitative analysis, theoretical guidance is provided for large-scale industrial application of a microbial remediation technology for reservoir guanidine gum fracturing fluid damage.
Description
Technical Field
The invention relates to the technical field of physical simulation of reservoirs, in particular to an experimental device and method for repairing fracturing damage of reservoir guar gum by microorganisms.
Background
With the development of economy and the improvement of productivity level, China has become the largest oil and gas resource consuming country in the world at present. Domestic oil and gas production efforts have also undergone a shift from and to conventional oil and gas resources. Among them, hydraulic fracturing is applied in field construction on a large scale as an important reservoir modification process. However, due to the complex and diverse reservoir conditions and other uncontrollable factors, the components in the guanidine gum fracturing fluid and the products after gum breaking can cause damage to the reservoir, thereby affecting the normal production of oil and gas. Therefore, how to effectively reduce the damage of the guanidine gum fracturing fluid to the reservoir so as to ensure the smooth production of oil and gas is increasingly important.
The guanidine gum fracturing fluid has the following possible damage types to oil and gas reservoirs in the practical application process: firstly, the buried depth of part of oil and gas reservoirs is shallow, the average temperature of the reservoirs is low, so that the effect of the traditional oxidative gel breaker is poor, and residues generated by uncracked fracturing fluid or incomplete gel breaking are retained in the reservoirs and cracks to block oil and gas production; secondly, when a fracture is formed by fracturing, a layer of compact filter cake is formed on the wall surface of the fracture due to high-pressure fluid loss between the fracturing fluid and the wall surface of the fracture. The filter cake has extremely low permeability and is not easy to be decomposed by the gel breaker, so that oil gas can not smoothly enter the fracture from the matrix after the fracturing is finished; finally, due to technical limitation, after the guanidine gum fracturing fluid breaks the gum, solid-phase residues which cannot be further decomposed by the gel breaker are generated, and the residue particles enter a reservoir stratum to block pore throats so as to influence oil and gas seepage. The traditional solution is usually to add activators or increase the amount of oxidizing agents and acids to the fracturing fluid. Not only add cost, but also have limited effectiveness, and may even cause corrosion of the tubing string and new reservoir contamination. Therefore, the microbial remediation method is receiving more and more attention as an effective, environment-friendly and low-cost damage remediation method for reservoir fracturing fluid.
Compared with the traditional oxidant and acid, the microbial remediation of the damage of the reservoir fracturing fluid has the advantages of safety, environmental protection, no corrosion, small damage to the reservoir, low fermentation cost, simple ground equipment, no need of additional injection pipelines and the like. Meanwhile, the characteristics of autonomous propagation and migration of the microorganisms also enable the method to have a larger action radius and a longer action effect. The main principle is that aiming at fracturing fluid pollutants enriched in a reservoir and a fracture, microbial strains capable of growing and propagating by using the fracturing fluid pollutants as a carbon source are screened out, and the pollutants are continuously consumed by using activities such as growth, propagation, migration and the like of the microorganisms until the original permeability and flow conductivity of the reservoir and the fracture are recovered.
At present, aiming at the problem of guanidine gum fracturing fluid pollution in the production process of oil and gas fields, a large number of indoor experiments show that the microbial remediation method for reservoir fracturing fluid damage has feasibility and is a novel reservoir damage remediation technology with broad development prospect. However, the indoor physical simulation research for this technology is not systematic and deep, and a great deal of research work is required to design a new physical simulation apparatus. Therefore, the research on the physical simulation of repairing the damage of the reservoir guanidine gum fracturing fluid by microorganisms under the multi-factor condition is carried out, and the research has important theoretical significance and important practical value. Therefore, to comprehensively research and disclose the feasibility and the repair mechanism of microbial repairing of the damage of the reservoir guanidine gum fracturing fluid and to better apply the feasibility and the repair mechanism to field production increase, a new physical simulation device for microbial repairing of the damage of the reservoir guanidine gum fracturing fluid needs to be constructed by starting from the characteristics of a real reservoir and combining the characteristics of a fracturing process.
In order to fully research and disclose the feasibility and repair mechanism of microbial repair of reservoir guanidine gum fracturing fluid damage, a reservoir physical simulation device is needed. At present, a common reservoir physical simulation device is a flat sand-packed physical model.
The main body of the flat sand-packed physical model generally comprises a hollow inner cavity and a shell, wherein the surface of the shell is provided with a simulation well head and a sensor measuring point, and the inner cavity is a reaction field for packing sand grains. The model is usually used for physical simulation such as profile control water shutoff or thick oil steam flooding, and the prior case of simulating the damage of the fracturing fluid of the reservoir by using a flat sand-packed physical model is less seen. The method has certain limitation in simulating microorganism to repair the damage of the reservoir fracturing fluid by using a flat sand-packed physical model. Firstly, because the cavity of the reservoir has no region division, the filled simulation reservoir can only simulate a whole block uniform permeability reservoir without cracks. Therefore, the damage of the following guanidine gum fracturing fluids to the reservoir cannot be simulated by using a flat plate sand pack model: firstly, the damage of incomplete gel breaking guanidine gum fracturing fluid to reservoir cracks and the microbial repair process can not be simulated at low temperature; secondly, the damage of the guanidine gum fracturing fluid filter cake to the wall surface of the crack and the microbial repair process cannot be simulated; finally, the microorganism system is a repair system capable of autonomously propagating and moving, and the action effect of the microorganism system is related to the microorganism concentration and the product concentration of each part of the reservoir, while the existing flat plate sand pack device system rarely comprises a sampling and analyzing system aiming at the microorganism and the product system.
Disclosure of Invention
The embodiment of the invention provides an experimental device and method for repairing reservoir guanidine gum fracturing damage by microorganisms.
In view of the above problems, the technical solution proposed by the present invention is:
an experimental apparatus for little bioremediation reservoir guanidine gum fracturing injury includes:
the microbial remediation reservoir fracturing fluid damage reaction system comprises a physical fracturing reservoir model, an air-conveying type oven and a simulation wellhead, and is the core of the whole device and used as a reaction site for microbial remediation reservoir fracturing fluid damage;
the fracturing reservoir physical model is arranged inside the wind conveying type oven, the simulation wellhead is arranged on the surface of the fracturing reservoir physical model, the fracturing reservoir physical model comprises an upper cover surface, a metal box body, an inner hexagonal screw, a cavity, quartz sand and a propping agent, the upper cover surface is arranged at the top of the metal box body, the inner hexagonal screw is simultaneously in threaded connection with the upper cover surface and the metal box body, the cavity is arranged inside the metal box body, and the propping agent and the quartz sand are sequentially arranged inside the cavity from inside to outside;
the reaction system storage system comprises a first intermediate container, a second intermediate container, a third intermediate container, a microorganism special sampling bottle and a water bath sleeve, and is used for storing formation water, a guanidine gum fracturing fluid system and culturing, storing and sampling and detecting guanidine gum degradation microorganism strains;
the third intermediate container is arranged in the water bath sleeve, and the special microorganism sampling bottle is communicated with one side of the third intermediate container;
the injection and vacuum-pumping system comprises a hand pump, an advection pump and a vacuum pump, and has the main functions of injecting different system reactants into the physical model of the fracturing reservoir and carrying out vacuum-pumping saturated formation water operation on the physical model of the fracturing reservoir;
the outlet of the advection pump is communicated with a second pipeline, the other end of the second pipeline is sequentially communicated with the second intermediate container and the third intermediate container in a penetrating manner and is communicated with the fracturing reservoir physical model, the outlet of the hand pump is communicated with a first pipeline, the other end of the first pipeline is communicated with the first intermediate container in a penetrating manner and is communicated with the fracturing reservoir physical model, the fracturing reservoir physical model is communicated with the sample collector through a fourth pipeline, the outlet of the vacuum pump is communicated with a third pipeline, and the other end of the third pipeline is communicated with the fracturing reservoir physical model;
the data and sample acquisition system comprises a computer, a pressure scanner and a sample collector, and is used for acquiring pressure data of different positions of a physical model of a fractured reservoir and collecting produced fluids of different positions of the model;
wherein the computer is in communication with the pressure scanner and the sample collector, respectively.
In order to better realize the technical scheme of the invention, the following technical measures are also adopted.
Further, the first intermediate container, the second intermediate container and the third intermediate container are respectively used for placing simulated formation water, a simulated guanidine gum fracturing fluid system and a microbial remediation system.
Further, the vacuum pump is used for vacuumizing the physical model of the fractured reservoir and performing saturated formation water operation.
Furthermore, the surface of the upper cover surface can be provided with a measuring point, and the lower end of the measuring point is communicated with the cavity and used for installing a pressure sensor or a sampling port.
Further, the air-conveying type oven is used for controlling the temperature of the physical model of the fractured reservoir.
Furthermore, the sample collector is used for collecting output liquids of different positions of the physical model of the fractured reservoir, and the concentration of strains and the concentration of the degradation products of the guar gum in the output liquids are detected by using spectrophotometer equipment.
Further, when the condition that the reservoir is damaged by incomplete gel breaking of the guanidine gum fracturing fluid under the low-temperature condition is simulated, injecting the guanidine gum fracturing fluid into a fracturing fluid system at the speed of 2ml/min by using a constant flow pump, and setting the temperature of the air-conveying type oven to be lower than the simulated reservoir temperature of 60 ℃; when the damage of a fracturing fluid filter cake to a reservoir is simulated, a hand pump is controlled to inject a fracturing fluid system at a large flow rate, so that a filter cake with a certain thickness is formed on the wall surface of a crack.
Further, the size of the cavity is 20cm by 5 cm.
The embodiment of the invention provides an experimental method for repairing reservoir guar fracturing damage by microorganisms, which comprises the following operation steps:
s1, selecting materials, and screening quartz sand and propping agent with a certain particle size range according to the reservoir permeability and fracture conductivity which need to be simulated;
s2, preprocessing, namely dividing the inner cavity space of the physical model of the fractured reservoir into a left part and a right part by utilizing a partition plate with a certain thickness according to the designed fracture width;
s3, processing materials, namely mixing and uniformly stirring quartz sand and an epoxy resin cementing agent in a mass ratio of 20:1, and placing the mixture in a beaker for later use;
s4, filling materials into the left half part and the right half part of the inner cavity respectively, adding a small amount of quartz sand for multiple times by using a special tool during filling, and beating the quartz sand by using the special tool to ensure compact and uniform filling;
s5, solidifying the material, after filling, slowly drawing out the partition plate, and placing the physical model of the fractured reservoir for more than 2 hours to fully bond sand grains;
s6, filling proppant, namely filling proppant into the space where the partition plate is originally placed, and compacting by using a special tool in the filling process;
and S7, completing filling, installing the lower wall of the cavity together with the lower reinforcing surface, screwing down the hexagonal screw, and turning the physical fracturing reservoir model to be horizontal to complete filling.
Compared with the prior art, the invention has the beneficial effects that:
the physical simulation device suitable for the microbial remediation experimental research on reservoir guanidine gum fracturing fluid damage is constructed by comprehensively considering the limitations of a flat plate sand-packed physical model and combining the characteristics of a fracturing process based on the characteristics of a real reservoir. The device adopts a 'partition plate partition method' to fill a simulated reservoir with cracks, simulates damage types of guanidine gum fracturing fluid of different reservoirs through different injection modes and reaction conditions, and realizes pressure detection of different positions of the simulated fractured reservoir through pressure sensors distributed at different positions of a model, so that the pressure field distribution of the simulated reservoir in the fracturing fluid damage process and the fracturing fluid damage process of microbial remediation is constructed; the produced fluid is separated and detected through samplers at different positions, the damage pollution degree and range of the reservoir fracturing fluid are predicted, the damage effect of the microbial repairing fracturing fluid is predicted, the mechanism is basically known through a method of combining experimental measurement and quantitative analysis, and therefore theoretical guidance is provided for large-scale industrial application of the microbial repairing technology of the reservoir guanidine gum fracturing fluid damage.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a schematic structural diagram of a combined profile control and flooding experimental apparatus disclosed in an embodiment of the present invention;
FIG. 2 is a front view of a physical model of a fractured reservoir as disclosed in an embodiment of the invention;
FIG. 3 is a left cut-away view of a physical model of a fractured reservoir as disclosed in an embodiment of the invention;
FIG. 4 is a top view of a physical model of a fractured reservoir as disclosed in an embodiment of the invention;
FIG. 5 is a diagram illustrating the effect of single vertical fracture reservoir bedding-in disclosed in an embodiment of the present invention;
fig. 6 is a schematic flow chart of an experimental method for repairing reservoir guar gum fracturing damage by microorganisms, which is disclosed by the embodiment of the invention.
Reference numerals:
1-injection and vacuum-pumping system; 101-a hand pump; 102-advection pump; 103-vacuum pump; 2-reaction system storage system; 201-a first intermediate container; 202-a second intermediate container; 203-a third intermediate container; 204-special sampling bottle for microorganism; 205-with water bath cover; 3-repairing the damage reaction system of the reservoir fracturing fluid by microorganisms; 301-fracturing the reservoir physical model; 30101-covering the upper surface; 30102-metal case; 30103-hexagonal socket head cap screw; 30104-cavity; 30105-quartz sand; 30106-a proppant; 302-air-moving type oven; 303-simulating a wellhead; 4-data and sample collection system; 401-a computer; 402-a pressure scanner; 403-a sample collector; 5-a first conduit; 6-a second conduit; 7-a third conduit; 8-a fourth conduit.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-5, a microbial remediation reservoir fracturing fluid damage reaction system 3 includes a fracturing reservoir physical model 301, an air-conveying type oven 302302 and a simulation wellhead 303, the microbial remediation reservoir fracturing fluid damage reaction system 3 is a core of the whole apparatus, and is used as a reaction site for microbial remediation reservoir fracturing fluid damage, and simultaneously obtains relevant pressure distribution and output therefrom, the fracturing reservoir physical model 301 is arranged inside the air-conveying type oven 302302, the air-conveying type oven 302 is used for controlling the temperature of the fracturing reservoir physical model 301, the simulation wellhead 303 is arranged on the surface of the fracturing reservoir physical model 301, the fracturing reservoir physical model 301 includes an upper cover surface 30101, a metal box 30102, an inner hexagonal screw 30103, a cavity 30104, quartz sand 30105 and a supporting agent 30106, the upper cover surface 30101 is installed on the top of the metal box 30102, the inner hexagonal screw 30103 is simultaneously in threaded connection with the upper cover surface 30101 and the metal box 30102, a cavity 30104 is arranged in the metal box 30102, the proppant 30106 and the quartz sand 30105 are sequentially arranged in the cavity 30104 from inside to outside, the reaction system storage system 2 comprises a first intermediate container 201, a second intermediate container 202, a third intermediate container 203, a special microorganism sampling bottle 6 and a water bath sleeve 205, the reaction system storage system 2 is used for storing formation water, a guanidine gum fracturing fluid system and culturing, storing and sampling guanidine gum degradation microorganism strains, the first intermediate container 201, the second intermediate container 202 and the third intermediate container 203 are respectively used for placing simulated formation water, a simulated guanidine gum fracturing fluid system and a microorganism repairing system, the third intermediate container 203 is arranged inside the jacket with water bath 205, the sampling bottle 6 special for microorganisms is communicated with one side of the third intermediate container 203, and is injected into and vacuumized by the system 1, the system 1 comprises a hand pump 101, a constant-current pump 102 and a vacuum pump 103, the system 1 mainly has the functions of injecting different system reactants into the physical model 301 of the fracturing reservoir and vacuumizing the physical model 301 of the fracturing reservoir to saturate the formation water, the vacuum pump 103 is used for vacuumizing the physical model 301 of the fracturing reservoir and saturating the formation water, the outlet of the constant-current pump 102 is communicated with a second pipeline 6, the other end of the second pipeline 6 is sequentially communicated with the second intermediate container 202 and the third intermediate container 203 and is communicated with the physical model 301 of the fracturing reservoir, the outlet of the hand pump 101 is communicated with a first pipeline 5, the other end of the first pipeline 5 is connected with the first intermediate container 201 in a penetrating manner and is communicated with the physical model of the fractured reservoir 301, the physical model of the fractured reservoir 301 is communicated with the sample collector 403 through a fourth pipeline 8, the outlet of the vacuum pump 103 is communicated with a third pipeline 7, the other end of the third pipeline 7 is communicated with the physical model of the fractured reservoir 301 and the data and sample collection system 4, the data and sample collection system 4 comprises a computer 401, a pressure scanner 402 and a sample collector 403, the data and sample collection system 4 is used for collecting pressure data of different positions of the physical model of the fractured reservoir 301 and collecting output liquid of different positions of the model, the strain concentration and the guanidine gum degradation product concentration are detected by using equipment such as a spectrophotometer, and the computer 401 is respectively communicated with the pressure scanner 402 and the sample collector 403, therefore, the pressure field distribution of a simulated reservoir stratum, the prediction of the damage pollution degree and range of the fracturing fluid of the reservoir stratum and the prediction of the damage effect of the microbial remediation fracturing fluid in the fracturing fluid damage process and the microbial remediation fracturing fluid damage process are constructed, when the condition that the damage to the reservoir stratum is caused by incomplete gel breaking of the guanidine gum fracturing fluid under the simulated low-temperature condition is simulated, the guanidine gum fracturing fluid is injected into a fracturing fluid system at the speed of 2ml/min by using the constant flow pump 102, and the temperature of the air-conveying type oven 302302 is set to be lower than the simulated reservoir stratum temperature of 60 ℃; when the damage of a fracturing fluid filter cake to a reservoir is simulated, the hand pump 101 is controlled to inject a fracturing fluid system at a large flow rate, so that a filter cake with a certain thickness is formed on the wall surface of a crack, and the experimental device for repairing the damage of the guar gum fracturing of the reservoir by microorganisms has the pressure detection of different positions of the simulated fracturing reservoir, so that the pressure field distribution of the simulated reservoir in the fracturing fluid damage process and the microbial repairing fracturing fluid damage process is established, the damage pollution degree and range of the fracturing fluid of the reservoir are predicted, and the damage effect prediction of the fracturing fluid is also predicted.
The embodiment of the invention is also realized by the following technical scheme.
Referring to fig. 1-4, in the embodiment of the present invention, the surface of the upper cover surface 30101 may further be provided with a measuring point, a lower end of the measuring point is communicated with the cavity 30104 for installing a pressure sensor or a sampling port, and the cavity 30104 has a size of 20cm by 5 cm.
In this embodiment, when the pressure sensors are installed, all the pressure sensors are connected to the pressure scanner 402 through data lines, the pressure scanner 402 is connected to the computer 401 through data lines, and the computer 401 records the pressure values of the pressure sensors at corresponding time points; when the installation is the sample connection, all sample connections link to each other with autosampler through fourth pipeline 8, and autosampler utilizes the sampling bottle sample to link to each other with computer 401 through the data line, and autosampler is used for the automatic collection to produce the fluid, and autosampler is supporting to have special software that sets up, can set up sample interval and sample volume.
Referring to fig. 6, a method of operation according to an embodiment of the present invention is shown;
s1, selecting materials, and screening quartz sand 30105 and a propping agent 30106 in a certain particle size range according to the reservoir permeability and fracture conductivity needing to be simulated;
s2, preprocessing, namely dividing the space of the inner cavity of the physical model 301 of the fractured reservoir into a left part and a right part by using a partition plate with a certain thickness according to the designed fracture width;
s3, processing materials, namely mixing and stirring uniformly quartz sand 30105 and epoxy resin cementing agent according to the mass ratio of 20:1, and placing the mixture in a beaker for later use;
s4, filling materials into the left half part and the right half part of the inner cavity respectively, adding a small amount of quartz sand 30105 for multiple times by using a special tool during filling, beating the quartz sand 30105 by using the special tool simultaneously, and ensuring compact and uniform filling;
s5, solidifying the material, after filling, slowly drawing out the partition plate, and placing the physical model 301 of the fractured reservoir for more than 2 hours to fully bond sand grains;
s6, filling a propping agent 30106, filling the propping agent 30106 in the space where the partition board is originally placed, and compacting by using a special tool in the filling process;
and S7, completing filling, installing the lower wall of the cavity together with the lower reinforcing surface, screwing down the hexagonal screws, and turning the physical fracturing reservoir model 301 to be horizontal to complete filling.
After filling is completed, the simulated fracturing fluid injection well is connected, a pressure sensor is installed at the simulated fracturing fluid injection well head, pressure sensors or sampling ports are installed at other measuring points except the injection well, and finally, a hand pump 101 or a constant flow pump 102 is selected to inject a fracturing fluid system according to the damage type of the fracturing fluid to be simulated.
The method comprises the following specific implementation steps:
firstly, respectively placing simulated formation water, a simulated guanidine gum fracturing fluid system and a microorganism repairing system in a first intermediate container 201, a second intermediate container 202 and a third intermediate container 203, screening quartz sand 30105 and a propping agent 30106 within a certain particle size range according to the reservoir permeability and crack conductivity to be simulated, dividing the cavity space of a model into a left part and a right part by using a partition plate with a certain thickness according to the designed crack width, uniformly mixing and stirring the quartz sand 30105 and an epoxy resin cementing agent according to the mass ratio of 20:1, placing the mixture in a beaker for later use, respectively filling the left half part and the right half part of the cavity, adding a small amount of quartz sand 30105 for multiple times by using a special tool during filling, simultaneously beating the quartz sand 30105 by using the special tool to ensure that the filling is compact and uniform, after the filling is finished, slowly withdrawing the partition plate, placing the model for more than 2h to fully cement sand grains, filling the propping agent 30106 in the space where the partition plate is originally placed, compacting by using a special tool in the filling process, installing the lower wall of the cavity and the lower reinforcing surface back, screwing a hexagonal screw, turning the model to be horizontal, completing filling, vacuumizing the physical model 301 of the fracturing reservoir, simulating formation water in a saturated mode, measuring the initial permeability and the fracture conductivity of the model water by using a pressure sensor in the period, selecting a hand pump 101 or an advection pump 102 to inject a fracturing fluid system into a well from a simulated fracturing fluid injection well according to the damage type of the fracturing fluid to be simulated, injecting the fracturing fluid system into the fracturing fluid system at the speed of 2ml/min by using the advection pump 102 when the condition that the reservoir is damaged by incomplete fracturing of the guanidine gum fracturing fluid under the low-temperature condition is simulated, setting the temperature of the wind-conveying type oven 302302 to be lower than the simulated reservoir temperature of 60 ℃, and controlling the hand pump 101 to inject the fracturing fluid system at a large flow rate when the damage of the fracturing filter cake fluid to the reservoir is simulated, so that a filter cake with a certain thickness is formed on the wall surface of the crack, after the injection of a fracturing fluid system is finished, the permeability, the crack flow conductivity and the pressure field distribution of the model at the moment are obtained by using a pressure sensor, finally, a guanidine gum fracturing fluid degradation strain system with a certain concentration and volume is injected from a fracturing fluid injection well, the temperature of an air-conveying type oven 302302 is set as the optimal growth temperature of the strain, after a certain time of reaction, the permeability, the crack flow conductivity and the pressure field distribution are obtained by using the pressure sensor, meanwhile, output fluids at different positions of the model are collected by using a sample collector 403, the strain concentration and the reducing sugar concentration of guanidine gum degradation products in the output fluids are detected by using equipment such as a spectrophotometer, the effect of repairing the damage of the guanidine gum fracturing fluid in the reservoir by the microorganism is comprehensively judged by combining the pressure field data, the strain concentration and the concentration data of the guanidine gum degradation products in the output fluids, and the experimental device for repairing the damage of the guanidine gum fracturing in the reservoir by the microorganism has the effect of simulating the fracturing of repairing the guanidine gum fracturing in different positions of the fracturing reservoir And (4) force detection, so that the pressure field distribution of a simulated reservoir in the damage process of the fracturing fluid and the damage process of the microbial repairing fracturing fluid is constructed, the damage pollution degree and range of the reservoir fracturing fluid are predicted, and the damage effect of the microbial repairing fracturing fluid is predicted.
It should be noted that the specific model specifications of the advection pump 102, the vacuum pump 103, and the pressure scanner 402 need to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art in the field, so detailed description is omitted.
The power supply and the principle of the advection pump 102, the vacuum pump 103 and the pressure scanner 402 are clear to the skilled person and will not be described in detail here.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The utility model provides an experimental apparatus of little bioremediation reservoir guanidine gum fracturing injury which characterized in that includes:
the microbial remediation reservoir fracturing fluid damage reaction system comprises a physical fracturing reservoir model, an air-conveying type oven and a simulation wellhead, and is the core of the whole device and used as a reaction site for microbial remediation reservoir fracturing fluid damage;
the fracturing reservoir physical model is arranged inside the wind conveying type oven, the simulation wellhead is arranged on the surface of the fracturing reservoir physical model, the fracturing reservoir physical model comprises an upper cover surface, a metal box body, an inner hexagonal screw, a cavity, quartz sand and a propping agent, the upper cover surface is arranged at the top of the metal box body, the inner hexagonal screw is simultaneously in threaded connection with the upper cover surface and the metal box body, the cavity is arranged inside the metal box body, and the propping agent and the quartz sand are sequentially arranged inside the cavity from inside to outside;
the reaction system storage system comprises a first intermediate container, a second intermediate container, a third intermediate container, a microorganism special sampling bottle and a water bath sleeve, and is used for storing formation water, a guanidine gum fracturing fluid system and culturing, storing and sampling and detecting guanidine gum degradation microorganism strains;
the third intermediate container is arranged in the water bath sleeve, and the special microorganism sampling bottle is communicated with one side of the third intermediate container;
the injection and vacuum-pumping system comprises a hand pump, an advection pump and a vacuum pump, and has the main functions of injecting different system reactants into the physical model of the fracturing reservoir and carrying out vacuum-pumping saturated formation water operation on the physical model of the fracturing reservoir;
the outlet of the advection pump is communicated with a second pipeline, the other end of the second pipeline is sequentially communicated with the second intermediate container and the third intermediate container in a penetrating manner and is communicated with the fracturing reservoir physical model, the outlet of the hand pump is communicated with a first pipeline, the other end of the first pipeline is communicated with the first intermediate container in a penetrating manner and is communicated with the fracturing reservoir physical model, the fracturing reservoir physical model is communicated with a sample collector through a fourth pipeline, the outlet of the vacuum pump is communicated with a third pipeline, and the other end of the third pipeline is communicated with the fracturing reservoir physical model;
the data and sample acquisition system comprises a computer, a pressure scanner and a sample collector, and is used for acquiring pressure data of different positions of a physical model of a fractured reservoir and collecting produced fluids of different positions of the model;
wherein the computer is in communication with the pressure scanner and the sample collector, respectively.
2. The experimental device for repairing reservoir guar fracturing damage by microorganisms according to claim 1, characterized in that: the first intermediate container, the second intermediate container and the third intermediate container are respectively used for placing simulated formation water, a simulated guanidine gum fracturing fluid system and a microbial remediation system.
3. The experimental device for repairing reservoir guar fracturing damage by microorganisms according to claim 1, characterized in that: the vacuum pump is used for vacuumizing the physical model of the fractured reservoir and performing saturated formation water operation.
4. The experimental device for repairing reservoir guar fracturing damage by microorganisms according to claim 1, characterized in that: the surface of the upper cover surface can be also provided with a measuring point, and the lower end of the measuring point is communicated with the cavity and used for installing a pressure sensor or a sampling port.
5. The experimental device for repairing reservoir guar fracturing damage by microorganisms according to claim 1, characterized in that: the air-conveying type oven is used for controlling the temperature of the physical model of the fractured reservoir.
6. The experimental device for repairing reservoir guar fracturing damage by microorganisms according to claim 1, characterized in that: the sample collector is used for collecting output liquids of different positions of the physical model of the fractured reservoir, and the concentration of strains and the concentration of degradation products of the guanidine gum in the output liquids are detected by using spectrophotometer equipment.
7. The experimental device for repairing reservoir guar fracturing damage by microorganisms according to claim 1, characterized in that: when the condition that the reservoir is damaged by incomplete gel breaking of the guanidine gum fracturing fluid under the low-temperature condition is simulated, injecting the guanidine gum fracturing fluid into a fracturing fluid system at the speed of 2ml/min by using a constant flow pump, and setting the temperature of an air-conveying type oven to be lower than the simulated reservoir temperature of 60 ℃; when the damage of a fracturing fluid filter cake to a reservoir is simulated, a hand pump is controlled to inject a fracturing fluid system at a large flow rate, so that a filter cake with a certain thickness is formed on the wall surface of a crack.
8. The experimental device for repairing reservoir guar fracturing damage by microorganisms according to claim 1, characterized in that: the dimensions of the cavity are 20cm by 5cm in length by width by height.
9. An experimental method for repairing reservoir guar fracturing damage by microorganisms, which applies the experimental device for repairing reservoir guar fracturing damage by microorganisms according to any one of claims 1 to 8, and is characterized by comprising the following steps:
s1, selecting materials, and screening quartz sand and propping agent with a certain particle size range according to the reservoir permeability and fracture conductivity which need to be simulated;
s2, preprocessing, namely dividing the inner cavity space of the physical model of the fractured reservoir into a left part and a right part by utilizing a partition plate with a certain thickness according to the designed fracture width;
s3, processing materials, namely mixing and uniformly stirring quartz sand and an epoxy resin cementing agent in a mass ratio of 20:1, and placing the mixture in a beaker for later use;
s4, filling materials into the left half part and the right half part of the inner cavity respectively, adding a small amount of quartz sand for multiple times by using a special tool during filling, and beating the quartz sand by using the special tool to ensure compact and uniform filling;
s5, solidifying the material, after filling, slowly drawing out the partition plate, and placing the physical model of the fractured reservoir for more than 2 hours to fully bond sand grains;
s6, filling proppant, namely filling proppant into the space where the partition plate is originally placed, and compacting by using a special tool in the filling process;
and S7, completing filling, installing the lower wall of the cavity together with the lower reinforcing surface, screwing down the hexagonal screw, and turning the physical fracturing reservoir model to be horizontal to complete filling.
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