Hydrocarbon reservoir construction method, device, apparatus, storage medium and product

Abstract

The application discloses a kind of oil and gas reservoir construction method, device, equipment, storage medium and product, it is related to oil and gas field development dense oil and gas reservoir construction technical field, the oil and gas reservoir construction method disclosed, comprising: by the preflush configured according to preset preflush configuration scheme is configured to the stratum in target area is made to form joint;When joint making is completed, the stratum is energized, to make the stratum form stratum main joint;By multiple times pump stop fracturing mode to the stratum main joint is fractured, obtains distance stratum main joint;According to preset proppant configuration scheme, the proppant configured is injected into the distance stratum main joint, obtains stratum with oil and gas reservoir.Compared with prior art, the present application is for low-pressure dense oil and gas reservoir, while carrying out large-scale volume modification, realize fast flowback, shorten operation cycle and realize dense oil and gas reservoir energization resistance reduction and cost reduction and efficiency improvement.

Description

Technical Field

[0001] This invention relates to the field of tight oil and gas reservoir construction technology in oil and gas field development, and particularly to an oil and gas reservoir construction method, apparatus, equipment, storage medium and product. Background Technology

[0002] Currently, the common oil and gas reservoir construction technology involves large-scale volumetric fracturing, which achieves volumetric stimulation through large volumes of fluid, sand, and displacement. This creates a complex network of fractures in the downhole oil and gas reservoir, allowing oil and gas fluids to flow through these networks into the main fractures, significantly increasing the controlled reservoir area and production per well. However, for tight oil and gas reservoirs, the construction and stimulation require large volumes of fluid and face significant limitations in technology, leading to challenges such as difficulty in achieving efficient stimulation, slow flowback rates, and potential damage from residual oil and gas in the underground reservoir.

[0003] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main objective of this invention is to provide a method, apparatus, equipment, storage medium, and product for constructing oil and gas reservoirs, aiming to solve the technical problems of difficult efficient transformation, slow flowback speed, and damage caused by oil and gas reservoirs remaining in underground reservoirs.

[0005] To achieve the above objectives, the present invention proposes a method for constructing oil and gas reservoirs, the method comprising:

[0006] Fractures are created in the formation within the target area using a pre-prepared pre-prepared liquid according to a pre-prepared liquid preparation scheme.

[0007] When the fracture is completed, the formation is energized to enable the formation to form the main fracture.

[0008] The main fracture of the formation was fracturing by multiple rounds of pump-stop fracturing to obtain an extended main fracture.

[0009] The proppant fluid prepared according to the preset proppant configuration scheme is injected into the main fracture of the extended formation to obtain a formation with oil and gas reservoirs.

[0010] In one embodiment, the preset pre-fracturing fluid configuration scheme includes a preset first viscosity configuration, a preset first fluid volume, and a preset first ratio. The pre-fracturing fluid includes high-viscosity gel fracturing fluid and liquid nitrogen fracturing fluid. The step of creating fractures in the formation within the target area using the pre-fracturing fluid configured according to the preset pre-fracturing fluid configuration scheme includes:

[0011] The high-viscosity gel fracturing fluid, configured according to the preset first viscosity, is injected into the formation within the target area according to the preset first volume.

[0012] When the volume of the high-viscosity gel fracturing fluid injected reaches the preset first volume, the liquid nitrogen fracturing fluid configured according to the preset first ratio will be injected into the formation within the target area to create fractures.

[0013] In one embodiment, the step of energizing the formation upon completion of fracture formation to enable the formation to form a main fracture includes:

[0014] When the formation fracture is detected to be complete, pure liquid nitrogen fracturing fluid is prepared according to the preset second fluid volume;

[0015] The pure liquid nitrogen fracturing fluid is injected into the formation according to the preset displacement to enhance the formation and enable the formation to form the main fracture.

[0016] In one embodiment, before the step of fracturing the main formation fracture through multiple rounds of pump-stop fracturing to obtain an extended main formation fracture, the following steps are included:

[0017] The medium-viscosity gel fracturing fluid configured according to the preset second viscosity is injected into the main fracture of the formation according to the preset third volume, and the liquid nitrogen fracturing fluid configured according to the preset second ratio is injected into the main fracture of the formation.

[0018] In one embodiment, before the step of injecting the proppant fluid prepared according to a preset proppant configuration scheme into the extended formation main fracture to obtain a formation with an oil and gas reservoir, the following steps are included:

[0019] Slippery water of a preset third viscosity is mixed with quartz sand of a preset first specification to obtain a sand-mixed liquid, which is then injected into the main fracture of the extended stratum.

[0020] In one embodiment, the preset proppant configuration scheme includes a preset third ratio, a preset second specification, and a preset fourth liquid volume. The step of injecting the proppant liquid configured according to the preset proppant configuration scheme into the extended formation main fracture to obtain a formation with oil and gas reservoir includes:

[0021] Liquid nitrogen and the high-viscosity gel fracturing fluid are mixed in a preset third ratio, and the quartz sand of a preset second specification is added to obtain the support fluid.

[0022] The propping fluid is injected into the main fracture of the extended formation according to a preset fourth volume to obtain the formation with oil and gas reservoir.

[0023] Furthermore, to achieve the above objectives, the present invention also proposes an oil and gas reservoir construction apparatus, the apparatus comprising:

[0024] The fracture-making module is used to create fractures in the formation within the target area using pre-fluid configured according to a preset pre-fluid configuration scheme.

[0025] An energy-enhancing module is used to enhance the energy of the formation when the fracture is formed, so as to enable the formation to form the main fracture.

[0026] The fracturing module is used to fracture the main fracture of the formation through multiple rounds of pump-stop fracturing to obtain an extended main fracture.

[0027] The support module is used to inject the proppant fluid configured according to the preset proppant configuration scheme into the main fracture of the extended formation to obtain a formation with oil and gas reservoirs.

[0028] Furthermore, to achieve the above objectives, the present invention also proposes an oil and gas reservoir construction device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the oil and gas reservoir construction method as described above.

[0029] In addition, to achieve the above objectives, the present invention also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the oil and gas reservoir construction method described above.

[0030] In addition, to achieve the above objectives, the present invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the oil and gas reservoir construction method described above.

[0031] One or more technical solutions proposed in this invention have at least the following technical effects:

[0032] This invention creates fractures in a target area using a pre-fluid configured according to a preset pre-fluid setup. Upon completion of fracture creation, the formation is revitalized to form a main fracture. The main fracture is then fractured using a multi-round pump-stop fracturing method to obtain an extended main fracture. Finally, a proppant fluid configured according to a preset proppant setup is injected into the extended main fracture to obtain a formation containing an oil and gas reservoir. Compared to existing technologies, this invention, targeting low-pressure tight oil and gas reservoirs, achieves large-scale volumetric modification while simultaneously enabling rapid flowback, shortening the operation cycle, and increasing the vitality and reducing drag of tight oil and gas reservoirs, as well as reducing costs and improving efficiency. Attached Figure Description

[0033] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a flowchart illustrating an embodiment of the oil and gas reservoir construction method of the present invention.

[0036] Figure 2 This is a diagram illustrating the effect of liquid nitrogen expansion on reservoir rocks in the oil and gas reservoir construction method of this invention.

[0037] Figure 3 This is a diagram of the formation fracture network system in the oil and gas reservoir construction method of the present invention;

[0038] Figure 4 This is a schematic diagram of the modular structure of an oil and gas reservoir construction device according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the oil and gas reservoir construction method in this embodiment of the invention.

[0040] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of the present invention and are not intended to limit the present invention.

[0042] To better understand the technical solution of the present invention, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0043] The main solution of this invention is as follows: fracturing is performed on the formation in the target area using a pre-fracturing fluid configured according to a preset pre-fracturing fluid configuration scheme; when the fracturing is completed, the formation is enhanced to form a main formation fracture; the main formation fracture is fracturing the main formation fracture through multiple rounds of pump-stop fracturing to obtain an extended main formation fracture; proppant fluid configured according to a preset proppant configuration scheme is injected into the extended main formation fracture to obtain a formation with oil and gas reservoirs.

[0044] In this embodiment, for ease of description, the identification controller will be used as the execution subject in the following description.

[0045] Currently, tight oil and gas reservoirs generally exhibit characteristics such as small porosity, low permeability, high brittle mineral content, and well-developed natural fractures. Due to low formation pressure, most natural fractures are in a closed state under natural conditions, resulting in poor connectivity and typically no or very low natural oil and gas production. Reservoir stimulation is an important method for increasing production, referring to the use of specific technological measures, through physical and chemical methods, to achieve the goal of enhancing production.

[0046] Common oil and gas reservoir construction techniques involve large-scale volumetric fracturing, using large volumes of fluid, sand, and displacement to achieve volumetric stimulation. This creates a complex network of fractures in the downhole oil and gas reservoir, through which oil and gas fluids flow into the main fractures, significantly increasing the reservoir control range and production of a single well. However, for tight oil and gas reservoirs, the construction and stimulation require large volumes of fluid and are subject to many limitations in terms of technology. This leads to challenges such as difficulty in achieving efficient stimulation, slow flowback rates, and potential damage caused by fluids remaining in the underground reservoir.

[0047] This invention provides a solution for fracturing formations in a target area using a pre-fluid configured according to a preset pre-fluid configuration. Upon completion of fracturing, the formation is revitalized to form a main formation fracture. This main formation fracture is then fractured using a multi-round pump-stop fracturing method to obtain an extended main formation fracture. Finally, a proppant fluid configured according to a preset proppant configuration is injected into the extended main formation fracture to obtain a formation containing an oil and gas reservoir. Compared to existing technologies, this invention, targeting low-pressure tight oil and gas reservoirs, achieves rapid flowback, shortens the operation cycle, and enhances the vitality and reduces drag of tight oil and gas reservoirs while simultaneously increasing costs and improving efficiency, all while simultaneously performing large-scale volumetric modification.

[0048] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or an electronic device or oil and gas reservoir construction equipment capable of performing the above functions. The following description uses a controller as an example to illustrate this embodiment and the subsequent embodiments.

[0049] Based on this, embodiments of the present invention provide a method for constructing oil and gas reservoirs, referring to... Figure 1 , Figure 1 This is a schematic flowchart of the first embodiment of the oil and gas reservoir construction method of the present invention.

[0050] In this embodiment, the oil and gas reservoir construction method includes steps S10 to S40:

[0051] Step S10: Create fractures in the formation within the target area using the pre-flush fluid configured according to the preset pre-flush fluid configuration scheme.

[0052] It should be noted that the above-mentioned pre-fracturing fluid configuration scheme uses a high-viscosity gel fracturing fluid with a viscosity of 220-260 MPa*s. The volume of the high-viscosity gel fracturing fluid is 300 cubic meters, and at the same time, 100 cubic meters of liquid nitrogen fracturing fluid is mixed in a 3:1 ratio. The two are combined as the above-mentioned pre-fracturing fluid. The high-viscosity gel fracturing fluid is composed of thickeners (such as plant gums, cellulose derivatives, synthetic polymers, etc.), crosslinking agents, breaker agents, and filtration reduction agents, etc. The liquid nitrogen fracturing fluid is composed of liquid nitrogen. The artificial fractures are created by utilizing the low-temperature effect caused by the huge temperature difference between liquid nitrogen and the formation.

[0053] It should be noted that the target areas mentioned above are areas where the strata contain oil and gas fields.

[0054] In practice, during the pre-fracturing stage of tight oil and gas reservoir construction, 300 cubic meters of the aforementioned high-viscosity gel fracturing fluid with a viscosity of 220-260 MPa*s are mixed with 100 cubic meters of the aforementioned liquid nitrogen fracturing fluid at a ratio of 3:1 to form the pre-fracturing fluid for fracturing, with a higher discharge rate.

[0055] Step S20: When the fracture is completed, the formation is energized so that the formation forms the main fracture.

[0056] It should be noted that the aforementioned main stratigraphic fractures serve as important channels and reservoirs for oil and gas migration and accumulation.

[0057] In practice, after completing the pre-flush stage as designed, 150 cubic meters of pure liquid nitrogen fracturing fluid are injected to partially enhance the energy of the formation, and the discharge rate is made to reach about 5 m3 / min under safe conditions.

[0058] Step S30: The main fracture of the formation is fracturing by multiple rounds of pump-stop fracturing to obtain an extended main fracture.

[0059] It should be noted that the aforementioned multi-round pump shutdown fracturing methods include three types. The first is to extend existing fractures: during development, if the fracturing scale is insufficient or the supporting fractures are short and have low conductivity, the existing fractures can be extended by increasing the fracturing scale to increase their conductivity. The second is to create new fractures within the formation: by injecting fracturing into non-primary oil layers or performing multiple rounds of fracturing on heterogeneous thick oil layers, or fracturing new layers in the same well, the oil production profile can be improved, increasing the recovery rate. The third is to redirect multiple rounds of fracturing: the existing fractures are plugged and then re-fracturing, creating new fractures at a certain angle to the original fractures. This method can both shut off water and increase oil production.

[0060] It should be noted that the aforementioned extended main stratigraphic fracture is an expansion of the original distance of the aforementioned main stratigraphic fracture.

[0061] It is understood that in this embodiment, one or more of the above-mentioned multi-round pump shutdown fracturing methods are used, and this embodiment does not limit this.

[0062] In practice, the aforementioned multi-round pump-stop fracturing method increases the effective length of the main fracture, as well as the longitudinal fracture height and lateral bandwidth. This ensures that the artificial fracture continues to extend primarily along the direction of maximum principal stress and improves reservoir control capabilities both longitudinally and laterally. As the artificial fracture extends forward, the fracture length increases significantly, resulting in the aforementioned extended formation main fracture.

[0063] Step S40: The propping fluid prepared according to the preset propping configuration scheme is injected into the main fracture of the extended formation to obtain a formation with oil and gas reservoirs.

[0064] It should be noted that the above-mentioned preset proppant configuration includes a mixture of liquid nitrogen and the above-mentioned high-viscosity gel fracturing fluid with a pumping ratio of 1:1, and the proppant is prepared by carrying 100 / 200 mesh quartz sand.

[0065] In practice, the high-viscosity gel fracturing fluid mixed with the aforementioned liquid nitrogen is pumped at a ratio of 1:1, carrying 100 / 200 mesh quartz sand. The fluid volume is selected as 250 cubic meters, and a flow rate of 100 kg / m³ is used. 3 The sand concentration is adjusted during construction, and after sand addition is completed, the liquid nitrogen fracturing fluid in one wellbore without sand is replaced, so that all the sand-mixed fluid in the wellbore is replaced into the formation, and the flowback rate is increased in the later stage.

[0066] This embodiment provides a method for constructing oil and gas reservoirs. The method involves creating fractures in the formation within a target area using a pre-formed pre-formed fluid according to a pre-formed fluid configuration scheme. Upon completion of the fracture formation, the formation is enhanced to form a main fracture. The main fracture is then fractured using a multi-round pump-stop fracturing method to obtain an extended main fracture. Finally, proppant fluid configured according to a pre-formed proppant configuration scheme is injected into the extended main fracture to obtain a formation containing an oil and gas reservoir. Compared to existing technologies, this invention targets low-pressure tight oil and gas reservoirs, enabling large-scale volumetric modification while achieving rapid flowback, shortening the operation cycle, and enhancing the energy and reducing drag of tight oil and gas reservoirs, as well as reducing costs and increasing efficiency.

[0067] refer to Figure 2 , Figure 2 This diagram illustrates the effect of liquid nitrogen expansion on reservoir rocks in the oil and gas reservoir construction method of this invention.

[0068] In this embodiment, step S10 includes steps S101 to S102:

[0069] Step S101: The high-viscosity gel fracturing fluid configured according to the preset first viscosity is injected into the formation within the target area according to the preset first volume.

[0070] It should be noted that the preset first viscosity can be 220-260 MPa*s;

[0071] It should be noted that the preset first liquid volume can be 300 cubic meters.

[0072] It is understood that the aforementioned preset first viscosity and the aforementioned preset first liquid volume are different in different oil and gas reservoir constructions, and this embodiment does not impose any restrictions on them.

[0073] In practical implementation, tight oil and gas reservoir stimulation requires large-scale fluid volumes, while also demanding effective reservoir utilization, rapid flowback rates, and reduced operating costs. Therefore, by injecting fracturing fluid into the formation and adding a certain proportion of liquid nitrogen fracturing fluid to effectively utilize the reservoir, production can be increased and subsequent fracturing fluid flowback can be accelerated, shortening the operation cycle and reducing operating costs. Thus, high-viscosity gel fracturing with a viscosity of 220–260 MPa*s and a volume of 300 cubic meters is used. The main purpose is to create a single primary fracture in the oil and gas reservoir, increasing the lateral reservoir control range and reducing the complexity of artificial fractures.

[0074] Step S102: When the volume of the gel fracturing fluid injected reaches the preset first volume, the liquid nitrogen fracturing fluid configured according to the preset first ratio is injected into the formation in the target area to create fractures.

[0075] It should be noted that the above-mentioned preset first ratio can be the ratio of liquid nitrogen fracturing fluid to high viscosity gel fracturing fluid volume (1:3).

[0076] It is understood that the aforementioned preset first ratio will vary in different oil and gas reservoir constructions, and this embodiment does not impose any restrictions on it.

[0077] In practice, to facilitate rapid flowback of the liquid after it breaks down, the aforementioned liquid nitrogen fracturing fluid, prepared in a 3:1 ratio, is injected during the pumping stage. 100 cubic meters of the liquid nitrogen fracturing fluid are mixed and then introduced into the artificial fractures in the reservoir. The addition of the liquid nitrogen fracturing fluid does not affect the fracture-creating performance of the high-viscosity gel fracturing fluid. Meanwhile, during the flowback stage of the stimulation operation, the vaporization of liquid nitrogen can increase the volume by 696 times (20℃, 101.325kPa). Under the enormous gas pressure, the rock mass fractures, increasing the permeability of the coal seam, facilitating rapid flowback, and reducing the cost of subsequent operations.

[0078] In this embodiment, step S20 includes steps S201 to S202:

[0079] Step S201: When the formation fracturing is detected to be complete, pure liquid nitrogen fracturing fluid is prepared according to the preset second liquid volume.

[0080] It should be noted that the aforementioned preset second liquid volume can be 150 cubic meters;

[0081] It should be noted that the above-mentioned pure liquid nitrogen fracturing fluid uses liquid nitrogen as the fracturing fluid and is injected into the formation through a high-pressure pump set.

[0082] In practice, after completing the pre-flush stage as designed, injecting 150 cubic meters of the aforementioned pure liquid nitrogen fracturing fluid helps with fluid flowback, improves the flowback capacity and fracturing effect of fracturing fluid in "low-temperature, low-volume, and low-energy" oil and gas reservoirs, and partially enhances the formation's energy. Pumping the aforementioned pure liquid nitrogen fracturing fluid can reduce the friction of the fluid tubing, and the liquid nitrogen is converted into a gaseous state within the formation, increasing its volume several times. As it expands along the main fracture, it enters the fracture depth, and the expansion is accompanied by temperature changes, which can cause the reservoir at the distal end of the fracture to fracture, generating various micro-fractures, improving the vertical reservoir control capacity, providing conditions for the formation of complex fractures in the later stage, and significantly increasing the vaporization volume (>100 times), thus playing a good role in assisting flowback.

[0083] Step S202: The pure liquid nitrogen fracturing fluid is injected into the formation according to the preset displacement to enhance the formation and form the main fracture.

[0084] It should be noted that the above-mentioned preset displacement can be 5m. 3 / min.

[0085] In practice, the increase in permeability achieved by pure liquid nitrogen fracturing manifests itself in two main ways. First, the heat absorption during liquid nitrogen vaporization generates a low-temperature effect that causes the rock skeleton to shrink, producing cold contraction stress. When the stress intensity factor exceeds the fracture toughness of the coal fractures, micro-damage occurs in the rock mass. Second, the vaporization of liquid nitrogen increases its volume by hundreds of times. This increased volume generates expansion forces that compress or stretch the rock mass. When these expansion forces gradually increase beyond the compressive strength of the rock mass, the rock mass will break down, generating micro-fractures. Due to these effects, the original fractures in the coal body expand, creating new micro-fractures, thereby increasing permeability.

[0086] In one possible implementation, step S31' may be included before step S30:

[0087] Step S31': Inject the medium-viscosity gel fracturing fluid configured according to the preset second viscosity into the main fracture of the formation according to the preset third volume, and inject the liquid nitrogen fracturing fluid configured according to the preset second ratio into the main fracture of the formation.

[0088] It should be noted that the preset second viscosity can be 110-150 MPa*s;

[0089] It should be noted that the above-mentioned medium-viscosity gel fracturing fluid is formulated with water or oil as solvent or dispersion medium, and with the addition of various additives such as thickener, crosslinking agent, and breaker.

[0090] It should be noted that the aforementioned preset third liquid volume can be 200 cubic meters;

[0091] It should be noted that the aforementioned preset second ratio can be the ratio of the volume of viscous gel fracturing fluid in a 1:4 ratio of liquid nitrogen fracturing fluid.

[0092] In this specific implementation, a medium-viscosity gel fracturing fluid with a viscosity of 110–1500 MPa*s is selected for non-sand-carrying fracturing, with a volume of 200 cubic meters, mixed with 50 cubic meters of the aforementioned liquid nitrogen fracturing fluid. Since the liquid nitrogen fracturing fluid in the main fracture of the formation causes rock reservoir fracturing and increases the number of micro-fractures without forming high-conductivity fractures, this embodiment pumps the aforementioned medium-viscosity gel fracturing fluid, mixed with a small amount of the aforementioned liquid nitrogen fracturing fluid. This mixed liquid has a strong fracturing ability, and the mixed liquid nitrogen can reduce wellbore friction and increase formation capacity after expansion, squeezing some of the mixed liquid present in the artificial fractures into the micro-fractures to form branch fractures and increasing the complexity of the branch fractures.

[0093] In one possible implementation, step S41' may be included before step S40:

[0094] Step S41': Mix the slickwater of the preset third viscosity with the quartz sand of the preset first specification to obtain a sand-mixed liquid, and inject the sand-mixed liquid into the main fracture of the extended stratum.

[0095] It should be noted that the aforementioned preset third viscosity can be 6 to 10 MPa*s;

[0096] It should be noted that the aforementioned slickwater is a fracturing fluid with excellent fluidity and lubrication properties, which can reduce wellbore friction resistance and improve the delivery efficiency of fracturing fluid.

[0097] It should be noted that the above-mentioned preset first specification can be 70 / 140 mesh or 40 / 70 mesh;

[0098] It should be noted that the above-mentioned sand mixing solution can be made by mixing 70 / 140 mesh and 40 / 70 mesh quartz sand with the above-mentioned slickwater with a viscosity of 6 to 10 MPa*s.

[0099] In the specific implementation, the aforementioned low-viscosity slickwater with a viscosity of 6–10 MPa*s is used, with a volume of 800 cubic meters, carrying 70 / 140 mesh and 40 / 70 mesh quartz sand, and the sand concentration is set to 120 kg / m³. 3The main purpose is to allow low-viscosity liquids to extend and support the artificial fractures formed in the previous steps, and to add them in a manner that starts with small particles and gradually increases their size. In the smaller-diameter branch fractures, the range of oil and gas reservoirs controlled by the artificial fractures is further increased, thereby increasing the effective stimulation volume. The larger-diameter particles support the main fractures in the formation and improve the effectiveness of the branch fractures, thereby increasing the stimulation range.

[0100] refer to Figure 3 , Figure 3 This is a diagram of the formation fracture network system in the oil and gas reservoir construction method of the present invention.

[0101] In this embodiment, step S40 includes steps S401 to S402:

[0102] Step S401: Mix liquid nitrogen with the high-viscosity gel fracturing fluid according to a preset third ratio, and add the quartz sand of a preset second specification to obtain the support fluid.

[0103] It should be noted that the aforementioned preset third ratio can be the ratio of liquid nitrogen fracturing fluid to high-viscosity gel fracturing fluid in a 1:1 ratio.

[0104] It should be noted that the above-mentioned preset second specification is 100 / 200 mesh.

[0105] In practice, a high-viscosity gel fracturing fluid, mixed with liquid nitrogen at a pumping ratio of 1:1, is injected into the main fracture of the formation. The viscosity of this high-viscosity gel fracturing fluid is 240–260 MPa*s, ensuring its propagation within the main fracture. This high-viscosity gel fracturing fluid also carries proppant, specifically 100 / 200 mesh quartz sand, to form the proppant fluid. A proppant flow rate of 100 kg / m³ is used. 3 Construction is carried out using sand concentration.

[0106] Step S402: The propping fluid is injected into the main fracture of the extended formation according to a preset fourth volume to obtain the formation with oil and gas reservoir.

[0107] It should be noted that the above-mentioned preset fourth liquid volume can be 250 cubic meters.

[0108] In practice, liquid nitrogen is used to inject the aforementioned proppant fluid at a rate of 250 cubic meters into the main fracture of the extended formation. This improves the flowback efficiency after fracturing in low-pressure oil and gas reservoirs (including coalbed methane) and reduces reservoir damage. The high-viscosity gel accompanying the liquid nitrogen has excellent proppant-carrying capacity and helps reduce fluid tubing friction, allowing small-diameter proppant particles to enter unsupported branch fractures. When the mixture finally enters the formation, it more easily forms high-conductivity artificial fractures near the wellbore, reducing the flow resistance of oil and gas fluids entering the wellbore through artificial fractures, reducing energy consumption, and facilitating increased production after fracturing. In summary, the construction method of this embodiment forms a complex fracture network system of artificial fractures and branch fractures of different levels for tight oil and gas reservoirs. Artificial fractures with different particle sizes are supported by proppant for different flow requirements, ensuring the effectiveness of the construction volume. The injection of different degrees of the above-mentioned liquid nitrogen fracturing fluid facilitates the return of fracturing fluid after gel breaking in artificial fractures of different levels, increases the reservoir oil displacement efficiency, and achieves energy enhancement, drag reduction, cost reduction and efficiency improvement in tight oil and gas reservoirs.

[0109] It should be noted that the above examples are only for understanding the present invention and do not constitute a limitation on the oil and gas reservoir construction method of the present invention. Any simple modifications based on this technical concept are within the protection scope of the present invention.

[0110] This invention also provides an oil and gas reservoir construction apparatus, please refer to... Figure 4 The oil and gas reservoir construction apparatus includes:

[0111] The fracture-forming module 10 is used to create fractures in the formation within the target area using a pre-fluid configured according to a preset pre-fluid configuration scheme.

[0112] The energy-enhancing module 20 is used to enhance the energy of the formation when the fracture is formed, so as to enable the formation to form the main fracture.

[0113] The fracturing module 30 is used to fracture the main fracture of the formation through a multi-round pump-stop fracturing method to obtain an extended main fracture of the formation.

[0114] The support module 40 is used to inject the proppant fluid configured according to the preset proppant configuration scheme into the main fracture of the extended formation to obtain a formation with oil and gas reservoirs.

[0115] The oil and gas reservoir construction apparatus provided by this invention, employing the oil and gas reservoir construction method described in the above embodiments, can solve the technical problems of oil and gas reservoir construction. Compared with the prior art, the beneficial effects of the oil and gas reservoir construction apparatus provided by this invention are the same as those of the oil and gas reservoir construction method provided in the above embodiments, and other technical features in the oil and gas reservoir construction apparatus are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0116] The present invention provides an oil and gas reservoir construction device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform the oil and gas reservoir construction method in the above embodiment 1.

[0117] The following is for reference. Figure 5 The diagram illustrates a structural schematic of an oil and gas reservoir construction device suitable for implementing embodiments of the present invention. The oil and gas reservoir construction device in the embodiments of the present invention may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital radio receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), vehicle terminals (e.g., vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 5 The oil and gas reservoir construction equipment shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of the present invention.

[0118] like Figure 5As shown, the oil and gas reservoir construction equipment may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the oil and gas reservoir construction equipment. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to I / O interface 1006: input devices 1007 including, for example, touchscreens, touchpads, keyboards, mice, image sensors, microphones, accelerometers, gyroscopes, etc.; output devices 1008 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; storage devices 1003 including, for example, magnetic tapes, hard disks, etc.; and communication devices 1009. Communication device 1009 allows the oil and gas reservoir construction equipment to communicate wirelessly or wiredly with other equipment to exchange data. Although oil and gas reservoir construction equipment with various systems is shown in the figure, it should be understood that it is not required to implement or possess all the systems shown. More or fewer systems may be implemented alternatively.

[0119] In particular, according to the embodiments disclosed in this invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of this invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this invention.

[0120] The oil and gas reservoir construction equipment provided by this invention, employing the oil and gas reservoir construction method in the above embodiments, can solve the technical problems of oil and gas reservoir construction. Compared with the prior art, the beneficial effects of the oil and gas reservoir construction equipment provided by this invention are the same as those of the oil and gas reservoir construction method provided in the above embodiments, and other technical features of this oil and gas reservoir construction equipment are the same as those disclosed in the method of the previous embodiment, and will not be repeated here.

[0121] It should be understood that the various parts disclosed in this invention can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0122] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

[0123] The present invention provides a computer-readable storage medium having computer-readable program instructions (i.e., computer programs) stored thereon, the computer-readable program instructions being used to execute the oil and gas reservoir construction method in the above embodiments.

[0124] The computer-readable storage medium provided by this invention may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0125] The aforementioned computer-readable storage medium may be included in the oil and gas reservoir construction equipment; or it may exist independently and not be assembled into the oil and gas reservoir construction equipment.

[0126] The aforementioned computer-readable storage medium carries one or more programs that, when executed by an oil and gas reservoir construction device, cause the oil and gas reservoir construction device to: create fractures in the formation within the target area using pre-flush fluid configured according to a preset pre-flush configuration scheme; enhance the formation's energy upon completion of fracture creation to form a main formation fracture; fracture the main formation fracture using a multi-round pump-stop fracturing method to obtain an extended main formation fracture; and inject proppant fluid configured according to a preset proppant configuration scheme into the extended main formation fracture to obtain a formation containing an oil and gas reservoir.

[0127] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. These programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—and conventional procedural programming languages—such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0128] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0129] The modules described in the embodiments of the present invention can be implemented in software or hardware. The names of the modules do not necessarily limit the specific unit itself.

[0130] The readable storage medium provided by this invention is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described oil and gas reservoir construction method, thereby solving the technical problems of oil and gas reservoir construction. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided by this invention are the same as those of the oil and gas reservoir construction method provided in the above embodiments, and will not be repeated here.

[0131] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the oil and gas reservoir construction method described above.

[0132] The computer program product provided by this invention can solve the technical problems of oil and gas reservoir construction. Compared with the prior art, the beneficial effects of the computer program product provided by this invention are the same as those of the oil and gas reservoir construction method provided in the above embodiments, and will not be repeated here.

[0133] The above description is only a part of the embodiments of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for constructing an oil and gas reservoir, characterized in that, The oil and gas reservoir stimulation method includes: Fractures are created in the formation within the target area using a pre-prepared pre-prepared liquid according to a pre-prepared liquid preparation scheme. When the fracture is completed, the formation is energized to enable the formation to form the main fracture. The main fracture of the formation was fracturing by multiple rounds of pump-stop fracturing to obtain an extended main fracture. The proppant fluid prepared according to the preset proppant configuration scheme is injected into the main fracture of the extended formation to obtain a formation with oil and gas reservoirs.

2. The method for constructing oil and gas reservoirs as described in claim 1, characterized in that, The preset pre-fracturing fluid configuration scheme includes a preset first viscosity configuration, a preset first fluid volume, and a preset first ratio. The pre-fracturing fluid includes high-viscosity gel fracturing fluid and liquid nitrogen fracturing fluid. The step of creating fractures in the formation within the target area using the pre-fracturing fluid configured according to the preset pre-fracturing fluid configuration scheme includes: The high-viscosity gel fracturing fluid, configured according to the preset first viscosity, is injected into the formation within the target area according to the preset first volume. When the volume of the high-viscosity gel fracturing fluid injected reaches the preset first volume, the liquid nitrogen fracturing fluid configured according to the preset first ratio will be injected into the formation within the target area to create fractures.

3. The method for constructing oil and gas reservoirs as described in claim 2, characterized in that, The step of enhancing the energy of the formation upon completion of fracture formation to enable the formation of a main fracture includes: When the formation fracture is detected to be complete, pure liquid nitrogen fracturing fluid is prepared according to the preset second fluid volume; The pure liquid nitrogen fracturing fluid is injected into the formation according to the preset displacement to enhance the formation and enable the formation to form the main fracture.

4. The method for constructing oil and gas reservoirs as described in claim 3, characterized in that, Before the step of fracturing the main fracture of the formation through multiple rounds of pump-stop fracturing to obtain an extended main fracture, the following steps are included: The medium-viscosity gel fracturing fluid configured according to the preset second viscosity is injected into the main fracture of the formation according to the preset third volume, and the liquid nitrogen fracturing fluid configured according to the preset second ratio is injected into the main fracture of the formation.

5. The method for constructing oil and gas reservoirs as described in claim 4, characterized in that, Before the step of injecting the proppant fluid prepared according to the preset proppant configuration scheme into the extended formation main fracture to obtain a formation with oil and gas reservoir, the following steps are included: Slippery water of a preset third viscosity is mixed with quartz sand of a preset first specification to obtain a sand-mixed liquid, which is then injected into the main fracture of the extended stratum.

6. The method for constructing oil and gas reservoirs as described in claim 5, characterized in that, The preset proppant configuration scheme includes a preset third ratio, a preset second specification, and a preset fourth liquid volume. The step of injecting the proppant liquid configured according to the preset proppant configuration scheme into the extended formation main fracture to obtain a formation with oil and gas reservoirs includes: Liquid nitrogen and the high-viscosity gel fracturing fluid are mixed in a preset third ratio, and the quartz sand of a preset second specification is added to obtain the support fluid. The propping fluid is injected into the main fracture of the extended formation according to a preset fourth volume to obtain the formation with oil and gas reservoir.

7. An oil and gas reservoir construction device, characterized in that, The device includes: The fracture-making module is used to create fractures in the formation within the target area using pre-fluid configured according to a preset pre-fluid configuration scheme. An energy-enhancing module is used to enhance the energy of the formation when the fracture is formed, so as to enable the formation to form the main fracture. The fracturing module is used to fracture the main fracture of the formation through multiple rounds of pump-stop fracturing to obtain an extended main fracture. The support module is used to inject the proppant fluid configured according to the preset proppant configuration scheme into the main fracture of the extended formation to obtain a formation with oil and gas reservoirs.

8. An oil and gas reservoir construction device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the oil and gas reservoir construction method as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the oil and gas reservoir construction method as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the steps of the oil and gas reservoir construction method as described in any one of claims 1 to 6.

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