CN113818869A - Tracing identification and capacity expansion yield increase method for water flooding dominant channel of water-drive reservoir - Google Patents
Tracing identification and capacity expansion yield increase method for water flooding dominant channel of water-drive reservoir Download PDFInfo
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- CN113818869A CN113818869A CN202111385811.4A CN202111385811A CN113818869A CN 113818869 A CN113818869 A CN 113818869A CN 202111385811 A CN202111385811 A CN 202111385811A CN 113818869 A CN113818869 A CN 113818869A
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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
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/11—Locating fluid leaks, intrusions or movements using tracers; using radioactivity
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/20—Computer models or simulations, e.g. for reservoirs under production, drill bits
Abstract
The invention discloses a tracing identification and capacity expansion yield increase method for a water flooding dominant channel of a water-drive reservoir, and belongs to the technical field of oil and gas exploitation. Solves the problems of huge investment, long measure time and high cost of the tertiary oil recovery technology in the prior art. The invention applies oil reservoir engineering methods such as tracing monitoring and numerical simulation, and accurately positions the injection water channeling layer, the injection water channeling speed, the direction of the water injection dominant channel, the thickness of the main seepage channel, the water flooding wave and the area in the high water-cut period of the water injection exploitation oil reservoir. By means of the parameters, oil reservoir numerical simulation software is used for optimizing the plugging area, the plugging range and the plugging strength, a water injection dominant channel plugging model is established as the basis of profile control construction design of the water drive development oil reservoir, and a comprehensive adjustment excavation potential method for profile control of a high-permeability reservoir section and hydraulic expansion and injection augmentation of a low-permeability reservoir section of a water injection well of the water injection development oil reservoir in a high water-cut period is adopted, so that the method is higher in applicability, better in excavation potential measure effect, economic, environment-friendly and simple and convenient to construct.
Description
Technical Field
The invention belongs to the technical field of oil and gas exploitation, and particularly relates to a tracing identification and capacity expansion yield increase method for a water flooding dominant channel of a water-drive reservoir.
Background
Most of water drive oil reservoirs in China are put into operation for decades, residual oil is trapped in oil reservoir sandstone pores in discontinuous oil block rings, the water drive oil reservoirs generally enter production stages of high water cut periods and ultrahigh water cut periods, high water cut high extraction and low injection water oil drive efficiency become main contradictions existing in current water drive oil reservoir development, and the method for researching how to develop the high water cut oil reservoirs becomes a main way for solving the current water drive oil reservoir exploitation difficulty. In the mine field tests at home and abroad, tertiary oil recovery technologies such as alkali flooding for reducing the tension of an oil-water interface, polymer flooding for increasing the water wave and volume of injection, alkali + polymer compound flooding and the like are mainly used for increasing the recovery ratio of a water-flooding oil reservoir, but the tertiary oil recovery technologies have the disadvantages of huge investment, long measure time, high cost and the like, and the popularization of the tertiary oil recovery technologies in the development of oil fields is restricted to a certain extent.
The water flooding reservoir dominant channel tracing, plugging and capacity-expanding and potential-excavating method is a comprehensive oil reservoir mining and potential-excavating technology integrating water flooding dominant channel tracing monitoring, numerical simulation building and plugging model, high-permeability reservoir section dominant channel profile control, oil displacement and hydraulic capacity expansion of low-permeability reservoir sections in high water-cut period, has strong measure pertinence, simple and convenient construction, low investment cost, safety, environmental protection and high efficiency, and is an effective means for solving the problem of low oil flooding efficiency of water flooding in the current water flooding reservoir high water-cut period development stage.
Disclosure of Invention
Aiming at the problems of huge investment, long measure time and high cost of tertiary oil recovery technology in the prior art, the invention provides a tracing identification and capacity expansion yield increase method for a water flooding oil reservoir water injection dominant channel, which aims to: the mining cost is reduced, and the construction period is shortened.
The technical scheme adopted by the invention is as follows:
a tracing, identifying, capacity expanding and yield increasing method for a water flooding dominant channel of a water flooding reservoir comprises the following steps:
step S1: identifying water injection layer sections, flow channeling directions and propulsion speeds of the water drive reservoir flow channeling by applying an interwell tracing monitoring technology, and simulating relevant parameters of the water drive dominant channel through interwell tracing interpretation software according to the data;
step S2: establishing a water drive dominant channel plugging model by using oil reservoir numerical simulation software according to reservoir geological parameters and water drive dominant channel related parameters simulated by interwell tracing interpretation software, and performing oil reservoir numerical simulation by using the established water drive dominant channel plugging model to optimize plugging parameters;
step S3: the profile control agent is adopted to block the water drive dominant channel of the high-permeability reservoir section between injection and production wells according to the optimized blocking parameters, so that the secondary excavation and potential of the high-permeability reservoir section of the water drive development reservoir are realized;
step S4: the water injection well low-permeability reservoir section is subjected to hydraulic expansion by circulating water power which is higher than the minimum horizontal main stress of the reservoir but not higher than the fracture pressure, so that the purposes of increasing the injection of the water injection well and increasing the yield of the corresponding oil well are achieved.
Preferably, step S1 specifically includes the following steps:
s11: respectively injecting different water-phase tracers into different water injection layer sections of the water injection well, collecting water samples of the oil well once every 1-5 days in a tracing monitoring period, detecting the output concentration of each tracer, drawing a tracer concentration output curve of the monitoring well, and determining the water injection layer section, the channeling direction and the propulsion speed of channeling according to the detection result of the produced tracers corresponding to the water injection well group;
s12: collecting reservoir geological parameters and production data of the oil-water well, combining tracer concentration production data of the oil-water well, applying interwell tracing interpretation software, and simulating relevant parameters of a water drive dominant channel by using a black oil model.
Preferably, the parameters related to the water flooding dominant channel comprise a pressure field between injection wells and production wells, a channeling horizon and a channeling speed between the injection wells and the production wells, an injected water seepage flow line, the thickness of a main seepage channel and a water flooding wave and area. Preferably, the reservoir geological parameters in step S12 include thickness, porosity and permeability of each reservoir, and the production data include daily production/water injection and daily oil production.
Preferably, the plugging parameters in step S2 include plugging area, plugging range and plugging strength.
Preferably, step S3 specifically includes the following steps:
s31: the optimization and injection mode design of the profile control agent; the injection mode of the profile control agent is multi-section plug injection, and comprises a front section plug, a main section plug and a rear section plug, wherein the front section plug is a high-concentration polymer plus crosslinking agent section plug, the main section plug is an oil-containing sludge profile control agent, and the rear section plug is a high-concentration polymer plus crosslinking agent section plug;
s32: injecting the profile control agent into the site for construction; adding suspending agent, additive and solid phase particles into the oil-containing sludge, and uniformly stirring to 15-18m3The displacement of/d injects the profile control agent into the formation.
Preferably, the density of the high-concentration polymer in the front slug is 1000-2000mg/L, and the density of the high-concentration polymer in the rear slug is 2000-3000 mg/L.
Preferably, step S4 specifically includes the following steps:
s41: carrying out on-site small-sized crack diagnosis test on a low-permeability reservoir section to obtain a mechanical property parameter and a physical property parameter of a reservoir rock, quantitatively analyzing the stress-strain characteristic of the reservoir in the expansion process based on the mechanical property parameter and the physical property parameter of the reservoir rock, optimizing construction pressure and discharge capacity, and analyzing the influence degree of heterogeneous oil reservoir and physical property of the oil reservoir on expansion;
s42: the construction pressure is controlled to be above the minimum main stress of a reservoir and below the fracture pressure, and the homogenization treatment of the periphery of the long-perforation section and the uniform utilization of the long-perforation section are realized by adopting a circulating hydraulic injection and reflux mode;
s43: by controlling the injection and discharge of a well head and adopting the injection and backflow modes, hydraulic shock is generated in a reservoir stratum, the development of shear fractures is stimulated, and the flow conductivity of natural fractures of the stratum is increased.
Preferably, in step S41, the mini crack diagnosis test includes: and adopting DFIT test to obtain the geomechanical property of the oil reservoir, test the ground stress, the closing pressure of the cracks in different directions and test the rock mechanical property parameters.
Preferably, the construction period of the step S41 is 8-12 hours, the construction period of the step S42 is 12-24 hours, the construction period of the step S43 is 3-5 hours, and the steps S41-S43 all use liquid which has no harm to the reservoir.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the method applies reservoir engineering methods such as tracing monitoring and numerical simulation to accurately position relevant parameters such as a channeling horizon, a channeling speed, a water injection dominant channel direction, a main seepage channel thickness, a water flooding wave and area and the like of the high-water-cut water injection exploitation reservoir. And optimizing the plugging area, the plugging range and the plugging strength by using oil reservoir numerical simulation software according to the parameters, and establishing a water injection dominant channel plugging model as a basis for profile control construction design of the water drive development oil reservoir. Different from the prior high-permeability interval profile control, the profile control mainly depends on the water absorption profile of a water injection well as the basis of profile control design, and the method has stronger purposiveness, pertinence and effectiveness.
2. The invention adopts the oily sludge as the plugging material of the superior channel of the high permeability reservoir section, and compared with the conventional profile control plugging material, the invention has the advantages of economy, environmental protection and simple and convenient construction.
3. The invention increases the water injection capacity of the low-permeability reservoir section by a circulating hydraulic shock method which is higher than the minimum principal stress of the stratum and lower than the fracture pressure of the stratum, compared with the conventional hydraulic fracturing, the invention effectively protects the reservoir, reduces the fracturing, simultaneously reduces the amount of propping agent required by the hydraulic fracturing, and has lower modification cost.
4. The comprehensive adjustment excavation and submergence method for profile control of the high-permeability reservoir section and hydraulic expansion and augmented injection of the low-permeability reservoir section of the water injection well of the water injection development reservoir in the high water-cut period is adopted, and compared with the conventional excavation and submergence means with single profile control of the water injection development reservoir, the comprehensive adjustment excavation and submergence method is higher in applicability and better in excavation and submergence measure effect.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1: monitoring a well tracer concentration output curve;
FIG. 2: pressure field between injection and production wells;
FIG. 3: a flow chart between injection wells and production wells;
FIG. 4: the thickness of the main seepage channel between the injection wells and the production wells is shown schematically;
FIG. 5: and (3) a construction curve diagram for hydraulic capacity expansion reconstruction of a low-permeability reservoir section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The present invention is described in detail below with reference to fig. 1-5.
A tracing, identifying, capacity expanding and yield increasing method for a water flooding dominant channel of a water flooding reservoir comprises the following steps:
and S1, identifying the water drive dominant channel of the injection-production flow unit, numerically simulating relevant parameters of the water drive dominant channel, and determining relevant parameters such as a channeling water injection layer section, the thickness of the main permeation channel, the swept area and the like. The specific operation is as follows:
s11: and selecting a high water-containing well group with low oil displacement efficiency in the injection-production flow unit for tracing and monitoring. Injecting different water phase tracers into different water injection layer sections of the water injection well, collecting water samples of the oil well once every 1-5 days in a tracing monitoring period, sending the water samples to a laboratory for detecting and analyzing the output concentration of each tracer, drawing a tracer concentration output curve of the monitoring well, and determining the water injection layer section, the channeling direction and the propulsion speed of channeling according to the detection result of the produced tracers corresponding to the water injection well group (see figure 1).
S12: and simulating related parameters of the water drive dominant channel by using inter-well tracing interpretation software. Reservoir geological parameters such as the thickness, porosity, permeability, daily output/water injection quantity, daily oil output and the like of each reservoir of the oil-water well are collected and arranged, tracer concentration output data of the oil production well is combined, inter-well tracing interpretation software is applied, and a black oil model is adopted to simulate water-drive dominant channel related parameters such as a pressure field, an injected water seepage flow line, the thickness, the swept area and the like of an injection-production well (see fig. 2-4).
And S2, establishing a dominant channel plugging model by using oil reservoir numerical simulation software, and performing oil reservoir numerical simulation by using the established plugging model according to reservoir geological parameters and related parameters such as the thickness, the swept area and the like of a dominant channel main permeation channel explained by tracing interpretation software to optimize plugging area, plugging range and plugging strength.
And S3, plugging the water drive dominant channel of the high-permeability reservoir section between injection and production wells by using a profile control agent according to the optimized plugging parameters (plugging area, plugging range and plugging strength), so as to realize secondary excavation and potential of the high-permeability reservoir section of the water drive development reservoir. The method adopts a double-sealing single-clamping process to inject an economic and environment-friendly profile control agent into the cross-flow reservoir section, and deeply blocks an advantageous channel between injection wells and extraction wells, so that the flow of injected water is diverted, and the residual oil in an oil reservoir is displaced, thereby achieving the purpose of improving the recovery ratio of the cross-flow reservoir section. The specific operation is as follows:
s31: the optimization and injection mode design of the profile control agent. The oily sludge generated in the development and production of the oil field is treated greatly, the pollution to the surrounding environment is serious, and the development and application of the oily sludge as a profile control agent for the depth profile control and profile control of the dominant channel are significant. The injection mode of the profile control agent is designed to be multi-section plug injection and comprises a front section plug, a main section plug and a rear section plug. The preposed slug is a 1000-plus-2000 mg/L high-concentration polymer + cross-linking agent slug, which aims to reduce the stratum adsorption capacity, ensure that the main slug is not diluted by stratum water, and then adjust the longitudinal permeability grade difference of an oil layer to fully play the plugging role of the main slug. The main slug is oil-containing sludge and has the functions of regulating the heterogeneity in the plane and layer, raising area and volume efficiency and reducing polymer consumption. The post-section plug is 2000-3000mg/L high-concentration polymer + cross-linking agent, and aims to improve the blocking capability of the profile control agent, so that an isolation protective band is gradually established between the main section plug and subsequent water injection, and the injected water is prevented from invading the main section plug to damage the stability of gel and wash away the sludge profile control agent.
S32: and (5) injecting the profile control agent into the site for construction. Preparing a profile control pump on site, wherein the maximum injection pressure is 25MPa, and the injection discharge capacity is 5-18m3D; 2 liquid preparation tanks with stirrers, the capacity of which is 10-15m3Each tank oil inlet and outlet and corresponding control valve; the high-pressure hose set is used for connecting a water injection main line and a liquid distribution tank. The on-site construction is carried out on the site of the water injection well site for batching and injecting, and the water for preparing the liquid comes from the sewage injected into the oil field, so that the cost of construction vehicles can be saved, and the problem of the sewage in the oil field can be solved. Discharging oily sludge from artificial hole of vertical oil-removing tank or buffer settling tank to underground pool, pumping into tank car, delivering to well site, discharging into stirring pool, adding certain amount of suspending agent, additive and solid-phase particles, stirring, and using profile control special pump to make the mixture reach 15-18m3The displacement of/d is injected into the formation.
And S4, applying a hydraulic expansion transformation method to improve the water injection quantity of the low-permeability reservoir section with poor water absorption of the water injection well and improve the utilization degree of the low-permeability reservoir section of the water-drive oil reservoir. The hydraulic expansion transformation method is characterized in that a circulating hydraulic injection and backflow which are higher than the minimum horizontal main stress (Shmin) of a reservoir but do not exceed the fracture pressure generate complex micro cracks in a low-permeability reservoir section to form an expansion area with large volume, high porosity and high permeability, so that the permeability of a rock body is improved, the contact area of the reservoir is increased, and the purposes of increasing production and increasing injection are achieved. The specific operation is as follows:
s41: and carrying out on-site small crack diagnosis test on the low-permeability reservoir section. Geomechanical properties of the reservoir, such as three-dimensional principal stress, permeability, reservoir pressure, fracture fluid efficiency, etc., are obtained through field-backflow-assisted DFIT testing. And testing the ground stress and the closing pressure of the cracks in different directions, testing the mechanical property parameters of the rock, and carrying out block ground stress description. Based on the mechanical property parameters and physical property parameters of the reservoir rock, the stress-strain characteristics of the reservoir during the expansion process are quantitatively analyzed, the optimization design of key parameters such as construction pressure and displacement is carried out, and the influence degree of heterogeneous oil reservoirs, physical properties of the oil reservoirs and the like on the expansion is analyzed. The construction period of this step usually takes 8-12 hours, and a liquid harmless to the reservoir is used.
S42: low-displacement, cyclic hydraulic well periphery pretreatment. And (4) applying the reservoir stress test result of the step S41, controlling the injection pressure to be above the minimum main stress of the reservoir and below the fracture pressure, improving the geomechanical parameters such as the ground stress and the pore pressure around the well by adopting a circulating hydraulic injection and reflux mode, realizing the homogenization treatment around the well of the long perforation section, and being beneficial to the uniform development of the expansion zone (the shear fracture zone) along the long well section. Meanwhile, the circulating hydraulic load is beneficial to uniformly using the perforation blastholes in different directions and layers, and the uniform use of the long perforation section is realized; the period of the step is generally 12-24 hours, and liquid which does not harm the reservoir is required to be used. The resulting construction graph is shown in fig. 5.
S43: and (5) circulating hydraulic oscillation. By controlling the injection and discharge of a well head and adopting the injection and backflow modes, hydraulic shock is generated in a reservoir stratum, the development of shear fractures is stimulated, and the flow conductivity of natural fractures of the stratum is increased. The period of the step is generally 3-5 hours, and liquid which does not harm the reservoir is required to be used. The resulting construction graph is shown in fig. 5.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (10)
1. A tracing, identifying, capacity expanding and yield increasing method for a water flooding dominant channel of a water flooding oil reservoir is characterized by comprising the following steps:
step S1: identifying water injection layer sections, flow channeling directions and propulsion speeds of the water drive reservoir flow channeling by applying an interwell tracing monitoring technology, and simulating relevant parameters of the water drive dominant channel through interwell tracing interpretation software according to the data;
step S2: establishing a water drive dominant channel plugging model by using oil reservoir numerical simulation software according to reservoir geological parameters and water drive dominant channel related parameters simulated by interwell tracing interpretation software, and performing oil reservoir numerical simulation by using the established water drive dominant channel plugging model to optimize plugging parameters;
step S3: plugging the water drive dominant channel of the high-permeability reservoir section between injection and production wells by using a profile control agent according to the optimized plugging parameters, so as to realize secondary excavation and potential of the high-permeability reservoir section of the water drive development reservoir;
step S4: the water injection well low-permeability reservoir section is subjected to hydraulic expansion by circulating water power which is higher than the minimum horizontal main stress of the reservoir but not higher than the fracture pressure, so that the purposes of increasing the injection of the water injection well and increasing the yield of the corresponding oil well are achieved.
2. The method for tracing, identifying, expanding capacity and increasing yield of the water flooding oil reservoir water flooding dominant channel according to claim 1, wherein the step S1 specifically comprises the following steps:
s11: respectively injecting different water-phase tracers into different water injection layer sections of the water injection well, collecting water samples of the oil well once every 1-5 days in a tracing monitoring period, detecting the output concentration of each tracer, drawing a tracer concentration output curve of the monitoring well, and determining the water injection layer section, the channeling direction and the propulsion speed of channeling according to the detection result of the produced tracers corresponding to the water injection well group;
s12: collecting reservoir geological parameters and production data of the oil-water well, combining the water injection layer section, the flow channeling direction and the propulsion speed of the flow channeling determined in the step S11, applying inter-well tracing and explaining software, and simulating relevant parameters of the water drive dominant channel by adopting a black oil model.
3. The method for tracing, identifying, expanding and increasing production of the water flooding oil reservoir water flooding dominant channel according to claim 1 or 2, wherein the relevant parameters of the water flooding dominant channel comprise an injection and production well pressure field, a channeling horizon and a channeling speed between injection and production wells, an injection water seepage flow line, a main seepage channel thickness and a water flooding wave and area.
4. The method for tracking, identifying, expanding and increasing the capacity of the water flooding dominant channel of the water flooding reservoir as claimed in claim 2, wherein the reservoir geological parameters in the step S12 include the thickness, porosity and permeability of each reservoir, and the production data include daily production/water flooding and daily oil production.
5. The method for tracking, identifying, expanding and increasing the capacity and the yield of the water flooding dominant channel of the water-drive reservoir according to claim 1, wherein the plugging parameters in the step S2 include plugging area, plugging range and plugging strength.
6. The method for tracing, identifying, expanding capacity and increasing yield of the water flooding oil reservoir water flooding dominant channel according to claim 1, wherein the step S3 specifically comprises the following steps:
s31: the optimization and injection mode design of the profile control agent; the injection mode of the profile control agent is multi-section plug injection, and comprises a front section plug, a main section plug and a rear section plug, wherein the front section plug is a high-concentration polymer plus crosslinking agent section plug, the main section plug is an oil-containing sludge profile control agent, and the rear section plug is a high-concentration polymer plus crosslinking agent section plug;
s32: injecting the profile control agent into the site for construction; into oil-containing sludgeAdding suspending agent, additive and solid phase particles, stirring at 15-18m3The displacement of/d injects the profile control agent into the formation.
7. The method for tracing, identifying, expanding and increasing the production of the water flooding dominant channel of the water-drive reservoir as claimed in claim 6, wherein the density of the high-concentration polymer in the front-located slug is 1000-2000mg/L, and the density of the high-concentration polymer in the rear-located slug is 2000-3000 mg/L.
8. The method for tracing, identifying, expanding capacity and increasing yield of the water flooding oil reservoir water flooding dominant channel according to claim 1, wherein the step S4 specifically comprises the following steps:
s41: carrying out on-site small-sized crack diagnosis test on a low-permeability reservoir section to obtain a mechanical property parameter and a physical property parameter of a reservoir rock, quantitatively analyzing the stress-strain characteristic of the reservoir in the expansion process based on the mechanical property parameter and the physical property parameter of the reservoir rock, optimizing construction pressure and discharge capacity, and analyzing the influence degree of heterogeneous oil reservoir and physical property of the oil reservoir on expansion;
s42: the construction pressure is controlled to be above the minimum main stress of a reservoir and below the fracture pressure, and the homogenization treatment of the periphery of the long-perforation section and the uniform utilization of the long-perforation section are realized by adopting a circulating hydraulic injection and reflux mode;
s43: by controlling the injection and discharge of a well head and adopting the injection and backflow modes, hydraulic shock is generated in a reservoir stratum, the development of shear fractures is stimulated, and the flow conductivity of natural fractures of the stratum is increased.
9. The method for tracking, identifying, expanding and increasing the capacity of the water flooding dominant channel of the water-flooding reservoir according to claim 8, wherein in step S41, the small fracture diagnosis test comprises: and adopting DFIT test to obtain the geomechanical property of the oil reservoir, test the ground stress, the closing pressure of the cracks in different directions and test the rock mechanical property parameters.
10. The method for tracing, identifying, expanding and increasing the capacity of the water-flooding oil reservoir water injection dominant channel according to claim 8, wherein the construction period of step S41 is 8-12 hours, the construction period of step S42 is 12-24 hours, the construction period of step S43 is 3-5 hours, and the steps S41-S43 all use liquid which has no harm to the reservoir.
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| CN115875030A (en) * | 2022-12-05 | 2023-03-31 | 西南石油大学 | Injection amount design and oil well fracture parameter optimization method under water injection well pressure flooding condition |
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