A high-dip-angle oil reservoir well site deployment method, device and equipment

Abstract

The application provides a high-inclination-angle oil reservoir well site deployment method, device and equipment, comprising: obtaining a stratum inclination angle of a high-inclination-angle oil reservoir, determining a structure line adjustment depth according to the stratum inclination angle, deploying a well site on a current layer structure line based on a well site deployment strategy, determining a position of a next layer structure line of the current layer structure line based on the position of the current layer structure line and the structure line adjustment depth when the well site deployment on the current layer structure line is completed, and deploying a well site on the next layer structure line based on the well site deployment strategy until the oil-water interface of the high-inclination-angle oil reservoir is proved; in this way, the structure line adjustment depth is determined according to the stratum inclination angle of the high-inclination-angle oil reservoir, the position of the next layer structure line is determined by using the current layer structure line and the structure line adjustment depth after the well site deployment on the current layer structure line is completed, the well site is continuously deployed on the next layer structure line, and the oil-water interface is proved; by using the progressive deployment method, the geological characteristics of the high-inclination-angle oil reservoir can be recognized while the well site deployment is implemented, the oil-water relationship of the high-inclination-angle oil reservoir can be reasonably determined, and the development effect of the oil reservoir is improved.

Description

Technical Field

[0001] This invention relates to the field of reservoir exploration technology, and in particular to a method, apparatus and equipment for well location deployment in high-inclination reservoirs. Background Technology

[0002] With the continuous improvement of exploration and development levels, contradictions such as high exploration levels in old areas, well networks, high recovery rates, severe water flooding, and difficulty in economic evaluation are becoming increasingly apparent. Currently, there are difficulties in well location deployment, and multiple factors have led to a situation where high-dipping reservoirs have few completed wells, low well control, complex oil-water relationships, large formation dip angles, and ineffective implementation of oil-bearing range and oil-water interface.

[0003] In related technologies, the geological bodies of conventional oil reservoirs are relatively well understood, and well location design is relatively simple. Generally, well locations are selected in areas with high structural elevations and thick oil layers. Traditional well placement methods involve deploying control wells in the middle of the reservoir or in areas considered reliable. However, when using this well placement method in high-dipping reservoirs in undeveloped or underdeveloped blocks, problems arise such as difficulty in identifying oil layers and poor development results, thus affecting the reservoir development outcome.

[0004] Therefore, there is an urgent need for a well placement method for high-angle reservoirs to improve the effective development of these reservoirs. Summary of the Invention

[0005] To address the problems existing in the prior art, embodiments of the present invention provide a method, apparatus, and equipment for deploying wells in high-angle reservoirs, in order to solve or partially solve the technical problem that when deploying wells in high-angle reservoirs using conventional reservoir deployment methods, it is difficult to identify oil layers, which easily leads to unreasonable well deployment and affects the development effect of high-angle reservoirs.

[0006] A first aspect of the present invention provides a method for well location deployment in high-inclination reservoirs, the method comprising:

[0007] Obtain the dip angle of the formation in the high-dipping reservoir, and determine the structural line adjustment depth based on the dip angle of the formation in the high-dipping reservoir;

[0008] Well locations are deployed on the current layer structure line based on a preset well location deployment strategy. When the well location deployment on the current layer structure line is completed, the position of the next layer structure line is determined based on the position of the current layer structure line and the adjustment depth of the structure line.

[0009] Based on the well placement strategy, wells are deployed on the next layer of structural line until the oil-water interface of the high-dipping reservoir is determined.

[0010] In the above scheme, if the current layer construction line is the first layer construction line, the method further includes:

[0011] Determine the oil-water interface of the high-angle reservoir;

[0012] The location of the first structural line is determined as the position above the oil-water interface and at a distance of a preset first depth threshold from the oil-water interface of the high-dipping reservoir.

[0013] In the above scheme, determining the structural line adjustment depth based on the formation dip angle of the high-dipping reservoir includes:

[0014] Determine the exploitable geological reserves of the high-angle oil reservoir;

[0015] The oil-bearing area of ​​the high-angle oil reservoir is determined based on the exploitable geological reserves, the oil layer thickness of the high-angle oil reservoir, the effective porosity of the oil layer in the high-angle oil reservoir, the original oil saturation of the oil layer in the high-angle oil reservoir, the surface crude oil density of the high-angle oil reservoir, and the formation crude oil volume factor of the high-angle oil reservoir.

[0016] The reservoir single-well operating radius of the high-angle reservoir is determined based on the oil-bearing area of ​​the high-angle reservoir;

[0017] The structural line adjustment depth is determined based on the reservoir single-well operating radius of the high-dipping reservoir and the formation dip angle.

[0018] In the above scheme, determining the recoverable geological reserves of the high-angle reservoir includes:

[0019] To obtain the economically recoverable reserves and calibrated recovery rate of the high-dipping reservoir;

[0020] According to the formula Determine the exploitable geological reserves N of the high-angle oil reservoir; wherein,

[0021] The N e E represents the economically recoverable reserves of the high-angle reservoir. R The calibrated recovery rate is given.

[0022] In the above scheme, determining the oil-bearing area of ​​the high-angle reservoir based on the exploitable geological reserves, the oil layer thickness of the high-angle reservoir, the effective porosity of the oil layer in the high-angle reservoir, the original oil saturation of the oil layer in the high-angle reservoir, the surface crude oil density of the high-angle reservoir, and the formation crude oil volume factor of the high-angle reservoir includes:

[0023] According to the formula Determine the oil-bearing area A0 of the high-angle reservoir; wherein,

[0024] N represents the exploitable geological reserves of the high-angle reservoir, and B represents... oiφ is the formation crude oil volume factor of the high-angle reservoir, h0 is the oil layer thickness of the high-angle reservoir, φ is the effective porosity of the reservoir in the high-angle reservoir, and S is... oi ρ represents the original oil saturation of the oil layer in the high-angle reservoir, and ρ represents the surface crude oil density of the high-angle reservoir.

[0025] In the above scheme, determining the reservoir single-well operating radius of the high-angle reservoir based on the oil-bearing area of ​​the high-angle reservoir includes:

[0026] According to the formula Determine the reservoir single-well operating radius γ of the high-angle reservoir; wherein,

[0027] A0 represents the oil-bearing area of ​​the high-angle reservoir.

[0028] In the above scheme, determining the structural line adjustment depth based on the reservoir single-well operating radius of the high-dipping reservoir and the formation dip angle includes:

[0029] The structural line adjustment depth χ is determined according to the formula χ=γ×tana; where γ is the reservoir single-well operating radius of the high-dipping reservoir, and a is the formation dip angle.

[0030] In the above scheme, the deployment of well locations on the current layer structural line based on a preset well location deployment strategy includes:

[0031] Based on the seismic properties of the current structural line, the location of the control well on the current structural line is determined, and the control well is deployed on the current structural line based on the location of the control well.

[0032] The control well is tested and produced. Based on the test production data, it is determined whether the control well is in an oil layer. If so, the remaining well positions are deployed on the current layer structure line based on the control well as the preset well spacing.

[0033] If the control well is not located in an oil layer, the control well will be used as a water injection well, and the remaining well locations will no longer be deployed on the current structural line.

[0034] A second aspect of the present invention provides a well location deployment device for high-angle reservoirs, the device comprising:

[0035] The acquisition unit is used to acquire the dip angle of the formation in the high-dipping reservoir and determine the structural line adjustment depth based on the dip angle of the formation in the high-dipping reservoir.

[0036] The first deployment unit is used to deploy well locations on the current layer structure line based on a preset well location deployment strategy. When the well location deployment on the current layer structure line is completed, the position of the next layer structure line is determined based on the position of the current layer structure line and the adjustment depth of the structure line.

[0037] The second deployment unit is used to deploy well locations on the next layer of structural line based on the well location deployment strategy until the oil-water interface of the high-dipping reservoir is determined.

[0038] A third aspect of the present invention provides a computer device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, implements the steps of the method described in any of the first aspects.

[0039] This invention provides a method, apparatus, and equipment for well placement in high-dipping reservoirs. The method includes: obtaining the formation dip angle of the high-dipping reservoir; determining a structural line adjustment depth based on the formation dip angle; placing wells on the current structural line based on a preset well placement strategy; when the well placement on the current structural line is completed, determining the position of the next structural line based on the position of the current structural line and the structural line adjustment depth; and placing wells on the next structural line based on the well placement strategy until the high-dipping reservoir is explored. The oil-water interface of the reservoir is determined. Based on the dip angle of the formation in the high-dipping reservoir, the structural line adjustment depth is determined. After the well placement for the current structural line is completed, the location of the next structural line can be determined based on the current structural line and its adjustment depth. Well placement continues in the next structural line until the oil-water interface is discovered. This gradual deployment method allows for simultaneous well placement and understanding of the geological characteristics of the high-dipping reservoir, thus enabling a reasonable determination of the oil-water relationship and accurate identification of the oil layer location, improving the effective development of the reservoir. Attached Figure Description

[0040] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0041] Figure 1 A schematic flowchart of a method for deploying well locations in a high-inclination reservoir according to an embodiment of the present invention is shown;

[0042] Figure 2 A schematic diagram of the well location deployed on the first structural line of a high-dipping reservoir according to an embodiment of the present invention is shown;

[0043] Figure 3 A schematic diagram of well locations deployed on the first and second structural lines of a high-dipping reservoir is shown according to an embodiment of the present invention.

[0044] Figure 4 A schematic diagram of a high-inclination reservoir well deployment device according to an embodiment of the present invention is shown. Detailed Implementation

[0045] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0046] This invention provides a method for well placement in high-inclination reservoirs, such as... Figure 1 As shown, the method mainly includes the following steps:

[0047] S110, Obtain the dip angle of the high-dipping reservoir, and determine the structural line adjustment depth based on the dip angle of the high-dipping reservoir.

[0048] In this invention, when progressively deploying wells in high-dipping reservoirs (where the formation dip is generally greater than 10°, and the dip can be directly obtained from seismic interpretation data), it is necessary to first determine the oil-water interface of the high-dipping reservoir. Wells are then progressively deployed along the structural lines above the oil-water interface until the oil-water interface is determined, at which point well deployment ceases. Two scenarios need to be considered when determining the oil-water interface:

[0049] The first scenario involves a high-dipping reservoir where the current fault block has never been developed (no old wells exist). In this case, it's necessary to obtain the oil-water interface and vertical fault displacement between the current fault block and adjacent fault blocks from well logging interpretation data or seismic data. The oil-water interface of the current fault block is then determined based on the oil-water interface and vertical fault displacement of the adjacent fault blocks. Adjacent fault blocks generally refer to those in the hanging wall or footwall region of the current fault block.

[0050] For example, if the oil-water interface of an adjacent fault block is at an elevation of -200m and the vertical fault displacement is 100m, then the oil-water interface of the current fault block in a high-dipping reservoir is at an elevation of -300m or -100m.

[0051] The second scenario involves high-dipping reservoirs where the current fault block has been previously developed (old wells exist). In this case, it's necessary to obtain oil testing or production data from the old wells. Based on this data, the oil and water content of the current fault block can be determined, and the oil-water interface can be preliminarily determined based on the changes in oil and water content. Generally, above the oil-water interface, the oil content is higher; below the interface, the water content is higher and there is no oil. Therefore, when determining locations with higher oil content and locations with higher water content but no oil, the area between the top surface of the location with higher water content but no oil and the bottom surface of the location with higher oil content but no oil is defined as the location of the oil-water interface.

[0052] To further improve the accuracy of oil-water interface determination, the oil-water interface can be reconfirmed by combining logging interpretation data from old wells. For example, the oil-water interface can be determined through resistivity curves.

[0053] Near the oil-water interface, the resistivity curve undergoes a significant change. From the oil layer to the water layer, the resistivity gradually decreases. This is because water conducts electricity better than oil, and formation water in the water layer lowers the resistivity. Therefore, the location of the oil-water interface can be determined by the inflection point or abrupt change in the resistivity curve. For example, when the resistivity suddenly drops from several hundred ohm-meters to several tens of ohm-meters, this location is the oil-water interface.

[0054] After the oil-water interface is determined, well locations are deployed above the interface. This invention employs a progressive deployment and measurement approach, deploying one layer of well locations before continuing to deploy downwards. After the well locations for the current structural line are deployed, the next structural line needs to be determined. Determining the depth of each structural line requires using structural line adjustment, therefore, the structural line adjustment depth must first be determined. In one embodiment, determining the structural line adjustment depth based on the formation dip angle of a high-dipping reservoir includes:

[0055] Determine the exploitable geological reserves of high-angle oil reservoirs;

[0056] The oil-bearing area of ​​a high-angle oil reservoir is determined based on the exploitable geological reserves, the thickness of the oil layer in the high-angle oil reservoir, the effective porosity of the oil layer in the high-angle oil reservoir, the original oil saturation of the oil layer in the high-angle oil reservoir, the surface crude oil density of the high-angle oil reservoir, and the formation crude oil volume factor of the high-angle oil reservoir.

[0057] The radius of operation of a single well in a high-angle reservoir is determined based on the oil-bearing area of ​​the reservoir.

[0058] The adjustment depth of the structural line is determined based on the reservoir single-well operating radius and formation dip angle of the high-dipping reservoir.

[0059] In one implementation, determining the exploitable geological reserves of a high-angle reservoir includes:

[0060] To determine the economically recoverable reserves and rated recovery rate of high-dipping reservoirs;

[0061] The exploitable geological reserves N of a high-angle reservoir are determined according to formula (1);

[0062]

[0063] Where, N e E represents the economically recoverable reserves (in ten thousand tons) of a high-dipping reservoir. R To calibrate the recovery rate (unit: %).

[0064] In this embodiment, the economically recoverable reserves N can be determined using methods such as analogy, material balance, or numerical simulation. e Among these methods, the analogy method primarily estimates the economically recoverable reserves of high-angle reservoirs by comparing development data with those of similar reservoirs. The material balance method calculates the economically recoverable reserves under different development schemes based on fluid flow simulations of high-angle reservoirs. Numerical simulation mainly utilizes reservoir simulation software to predict production and economic viability under different development strategies, thereby optimizing development schemes and predicting the economically recoverable reserves under those schemes.

[0065] In one embodiment, the oil-bearing area of ​​the high-angle reservoir is determined based on the exploitable geological reserves, the oil layer thickness of the high-angle reservoir, the effective porosity of the oil layer in the high-angle reservoir, the original oil saturation of the oil layer in the high-angle reservoir, the surface crude oil density of the high-angle reservoir, and the formation crude oil volume factor of the high-angle reservoir, including:

[0066] The oil-bearing area A0 of the high-angle reservoir is determined according to formula (2);

[0067]

[0068] Where N represents the recoverable geological reserves of the high-angle reservoir (unit: 10,000 tons), B oi denoted as , where h0 is the formation crude oil volume factor of the high-angle reservoir, h0 is the reservoir thickness (in meters), φ is the effective porosity (in %) of the reservoir, and S is the oil layer thickness. oi ρ represents the original oil saturation of the oil layer in the high-dipping reservoir (unit: %), and ρ represents the surface crude oil density of the high-dipping reservoir (unit: g / cm³).

[0069] In one implementation, determining the reservoir single-well activation radius of a high-angle reservoir based on its oil-bearing area includes:

[0070] The reservoir single-well operating radius γ of the high-angle reservoir is determined according to formula (3):

[0071]

[0072] Where A0 is the oil-bearing area of ​​the high-angle reservoir.

[0073] In one implementation, determining the structural line adjustment depth based on the reservoir well activation radius and formation dip angle of a high-dipping reservoir includes:

[0074] The adjustment depth χ (in meters) of the construction line is determined according to formula (4):

[0075] χ=γ×tana (4)

[0076] In formula (4), γ is the reservoir radius of a single well in a high-dipping reservoir (unit: meters), and a is the formation dip angle (unit: degrees).

[0077] Finally, based on formulas (1) and (4), the construction line adjustment depth is determined as follows:

[0078]

[0079] In formula (5), π is a constant and the other parameters are known values. This allows us to calculate the structural depth value that needs to be adjusted each time the control well is deployed downwards, thereby achieving a gradual deployment of the well location.

[0080] S111, deploy well locations on the current layer structural line based on a preset well location deployment strategy. When the well location deployment on the current layer structural line is completed, determine the position of the next layer structural line based on the position of the current layer structural line and the adjustment depth of the structural line.

[0081] In one implementation, before deploying well locations on the current layer construction line based on a preset well location deployment strategy, the method further includes:

[0082] If the current layer construction line is the first layer construction line, the position located above the oil-water interface and at a distance of a preset first depth threshold from the oil-water interface is determined as the location of the first layer construction line;

[0083] The first-layer structural line is determined based on the curvature of the oil-water interface and its location, and it is parallel to the oil-water interface.

[0084] Specifically, when deploying well locations, it is necessary to first determine the position of the first structural line. The first depth threshold can be 50m, or it can be set according to the actual situation of the reservoir; no restriction is imposed here. The location of the first structural line is determined at a position 50m away from the oil-water interface. It should be noted that the order of the steps of determining the position of the first structural line and determining the adjustment depth of the structural line can be interchanged in this invention; no restriction is imposed in this invention.

[0085] Then, the first-layer structural line is determined based on its location; the first-layer structural line is parallel to the oil-water interface. For example... Figure 2 As shown, mark 21 is the oil-water interface, and mark 22 is the first-layer structural line.

[0086] Once the first-layer structural line is determined, well locations can be deployed on the first-layer structural line based on a preset well location deployment strategy. Once the well location deployment on the first-layer structural line is completed, the location of the next layer structural line is determined based on the position of the first-layer structural line and the structural line adjustment depth.

[0087] Similarly, after the well locations on the next layer of structural line are deployed, the location of the next layer of structural line needs to be determined based on the location of the next layer of structural line and the adjustment depth of the structural line.

[0088] For any given structural line, the well placement strategy is the same. The only difference is that, to facilitate the adjustment of the well network in the later stages of reservoir development and to implement water injection or steam injection, the well positions of the next structural line are staggered with those of the current structural line.

[0089] For any current layer structural line, well locations are deployed on the current layer structural line based on a preset well location deployment strategy, including:

[0090] Based on the seismic properties of the current structural line, determine the location of the control well on the current structural line, and deploy the control well on the current structural line based on the location of the control well.

[0091] Test production is carried out on the control well. Based on the test production data, it is determined whether the control well is in an oil layer. If so, based on the control well as the preset well spacing, each oil well is deployed on the current layer structure line.

[0092] If the control well is not located in an oil layer, it will be used as a water injection well, and no more oil wells will be deployed on the current structural line.

[0093] Specifically, when deploying the first well (control well) on the current structural line, the location of the control well needs to be determined based on seismic data to increase the probability of successful deployment.

[0094] For example, if no wells have been deployed in the fault block to which the current structural line belongs, then the first seismic attribute of the adjacent fault block (where old wells exist) and the second seismic attribute of the fault block to which the current structural line belongs can be obtained. The seismic attributes can include amplitude, frequency, and phase attributes.

[0095] Since the second seismic attribute covers the seismic attributes of all locations in the fault block to which the current structural line belongs, the first target seismic attribute corresponding to the oil well can be extracted from the first seismic attribute. The seismic attributes of all locations in the fault block to which the current structural line belongs are compared with the first target seismic attribute, and the location of the second seismic attribute that meets the expectation is determined as the location of the control well of the current structural line.

[0096] For example, if the earthquake attribute is an amplitude attribute, the amplitude of all positions in the fault block to which the current structural line belongs is compared with the first target amplitude (difference processing can be performed). If the absolute value of the amplitude difference at a certain position in the fault block to which the current structural line belongs is less than a preset threshold, it means that the position meets the expectation and can be used as the position of the control well of the current structural line.

[0097] Similarly, if an oil well has been deployed on the fault block to which the current structural line belongs, then the third seismic attribute of the location of that oil well and the second seismic attribute of the fault block to which the current structural line belongs can be used. The seismic attribute can include amplitude, frequency, and phase attributes.

[0098] Since the second seismic attribute covers the seismic attributes of all locations in the fault block to which the current structural line belongs, the second target seismic attribute corresponding to the oil well can be extracted from the first seismic attribute. The seismic attributes of all locations in the fault block to which the current structural line belongs are compared with the third seismic attribute, and the location of the second seismic attribute that meets the expectation is determined as the location of the control well of the current structural line.

[0099] For example, if the earthquake attribute is amplitude, the amplitude of all positions in the fault block to which the current structural line belongs is compared with the target amplitude (difference processing can be performed). If the absolute value of the amplitude difference at a certain position in the fault block to which the current structural line belongs is less than the preset threshold, it means that the position meets the expectation, and the position is used as the location of the control well of the current structural line.

[0100] Once the location of the control well in the current structural line is determined, a test production of the control well is required. The test production data is then used to determine whether the control well is located in an oil-bearing layer. Specifically, the test production data can be analyzed for oil and water content. If the water content is high and there is no oil, it indicates that the control well is not located in an oil-bearing layer; if the oil content is high (exceeding the oil content threshold), it indicates that the control well is located in an oil-bearing layer.

[0101] If the control well is located in an oil layer, then based on the control well as the preset well spacing, each oil well is deployed on the current layer structure line;

[0102] If the control well is not located in the oil layer, it will be used as a water injection well, and no further wells will be deployed on the current structural line.

[0103] refer to Figure 2If the current structural line is the first structural line 22, the control well on the first structural line 22 is marked as A. Since the control well on the first structural line is located in the oil layer, the remaining well locations to be deployed are marked B1, B2 and B3. Figure 2 Marker 23 in the diagram represents a fault.

[0104] After the well locations for the current structural line are deployed, the location of the next structural line needs to be determined based on its position and adjustment depth. The adjustment depth is the distance between the current and next structural lines located below the current one. In other words, the position of the next structural line is determined by adjusting the current structural line downwards by one adjustment depth.

[0105] By deploying well locations within each structural line layer, a first control well is deployed. If the test production data from the control well confirms that the control well is located in an oil-bearing layer, then the structural line is indeed located in an oil-bearing layer. By deploying well locations layer by layer, the geological characteristics of each structural line can be accurately identified, thereby improving the accuracy of oil-bearing layer identification. Therefore, well locations can be accurately deployed, improving the development effect of the oil reservoir.

[0106] S112, Based on the well location deployment strategy, deploy well locations on the next layer of structural line until the oil-water interface of the high-dipping reservoir is determined.

[0107] Similarly, once the location of the next structural line is determined, well locations can be deployed on the next structural line based on the well location deployment strategy until well locations are deployed on all structural lines above the oil-water interface of the high-dipping reservoir, the oil-water interface is discovered, and well location deployment stops.

[0108] When deploying well locations on the next structural line, the deployment method is exactly the same as the well location deployment logic for the current structural line. The only difference is that, to facilitate later well network adjustments and the implementation of water or steam injection development, the well locations on the next structural line 31 need to be staggered with the well locations on the current structural line 22. For example... Figure 3 As shown, assuming the current structural line is the first structural line 22, and the control well of the next structural line 31 is located in the oil layer, both the first structural line 22 and the next structural line 31 are staggered. Figure 3 In the diagram, C is marked as the control well on the next structural line 31, and D1 to D4 are marked as the remaining well locations on the next structural line 31.

[0109] It should be noted that, assuming the control well position of the next layer structure line 31 is exactly below the control well of the current layer structure line 22, if the distance between the two control wells on the plane can meet the preset well spacing, then the control wells of the next layer structure line 31 and the control wells of the current layer structure line 22 do not need to be staggered, and the remaining well positions still need to be staggered.

[0110] If the distance between two control wells on the plane does not meet the preset well spacing, the control well of the next layer structure line 31 needs to be offset by a certain distance. The offset control well is still on the next layer structure line. The control well of the next layer structure line 31 and the control well of the current layer structure line 22 are staggered. The remaining well positions also need to be staggered.

[0111] After the well placement for the next structural line 31 is completed, the same method can be used to place wells for the next lower structural line until the oil-water interface is discovered. Discovering the oil-water interface can be understood as follows: if the position of the next structural line is lower than the position of the oil-water interface, it indicates that the oil-water interface has been discovered, and well placement for the next structural line ceases.

[0112] As can be seen, in this embodiment of the invention, the structural line adjustment depth is determined based on the formation dip angle of the high-dipping reservoir. After the well placement of the current structural line is completed, the position of the next structural line can be determined based on the current structural line and the structural line adjustment depth. Then, well placement continues on the next structural line until the oil-water interface is discovered. In this way, the geological characteristics of the high-dipping reservoir can be understood while well placement is being carried out, thus the oil-water relationship of the high-dipping reservoir can be reasonably determined, improving the effective development effect of the reservoir.

[0113] Based on the same inventive concept as in the foregoing embodiments, this embodiment also provides a high-inclination reservoir well location deployment device, such as... Figure 4 As shown, the device includes:

[0114] Acquisition unit 41 is used to acquire the dip angle of the formation in the high-dipping reservoir and determine the structural line adjustment depth based on the dip angle of the formation in the high-dipping reservoir.

[0115] The first deployment unit 42 is used to deploy well positions on the current layer structure line based on a preset well position deployment strategy. When the well position deployment on the current layer structure line is completed, the position of the next layer structure line is determined based on the position of the current layer structure line and the adjustment depth of the structure line.

[0116] The second deployment unit 43 is used to deploy well locations on the next layer of structural line based on the well location deployment strategy until the oil-water interface of the high-dipping reservoir is discovered.

[0117] Since the apparatus described in the embodiments of this invention is used to implement the high-angle reservoir well location deployment method of the embodiments of this invention, those skilled in the art can understand the specific structure and variations of the apparatus based on the method described in the embodiments of this invention, and therefore will not be described in detail here. All apparatuses used in the methods of the embodiments of this invention fall within the scope of protection of this invention.

[0118] In practical applications, the high-inclination reservoir well placement method and apparatus provided in the above embodiments are used to deploy wells in a certain oilfield reservoir block. The main characteristics of this reservoir block are: few completed wells and low well control; complex oil-water relationships, especially in the southern fault block, where the oil-bearing range and oil-water interface have not been effectively determined due to the large formation dip; and a low oil production rate of only 0.1%, indicating a long-term low-speed production state. To improve the success rate of new well drilling and avoid inefficient wells, this invention uses a "gradual well placement" method to deploy wells in this reservoir.

[0119] The reservoir in the studied block has a dip angle of 13 degrees, an economically recoverable reserve of 10,000 tons, a rated recovery rate of 25%, an oil layer thickness of 20 meters, an effective porosity of 15.6%, an initial oil saturation of 55.7%, a surface crude oil density of 0.87 grams per cubic centimeter, and a formation crude oil volume factor of 1.297. The structural line adjustment depth for each downward deployment of the control well, calculated using formula (5), is:

[0120]

[0121] If a control well 1 is deployed 50m above the oil-water interface in the block (first-layer structural line), and the suspected oil layer in the lower part of the control well 1 section is confirmed to be an oil layer, then other oil wells are deployed on the first-layer structural line.

[0122] To further explore the oil-water interface, the bottom of control well 1 was lowered by χ meters, and control well 2 was deployed again on the second structural line. To facilitate later well pattern adjustments and water or steam injection development, the second deployment was staggered from the first batch of wells.

[0123] After the second layer of structural lines is deployed, the well locations for the third layer of structural lines are deployed in the same way. After the well locations for the third layer of structural lines are deployed, the oil-water interface of the high-dipping reservoir is determined, the well location deployment is stopped, and the well location deployment work for the high-dipping reservoir is completed.

[0124] Ultimately, 21 new wells were deployed in the reservoir, and 13 of them have been put into production so far. The daily oil production in the well area has increased from 2 tons to a maximum of 70 tons, and the oil production rate has increased from 0.1% to 1.3%. The cumulative oil production in the phase is 50,000 tons, achieving stable reserve growth and production in the well area.

[0125] Based on the same inventive concept, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements any step of the method described above.

[0126] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0127] This invention provides a method, apparatus, and equipment for well placement in high-dipping reservoirs. The method includes: obtaining the formation dip angle of the high-dipping reservoir; determining the structural line adjustment depth based on the formation dip angle; placing wells on the current structural line based on a preset well placement strategy; once the well placement on the current structural line is completed, determining the position of the next structural line based on the position of the current structural line and the structural line adjustment depth; placing wells on the next structural line based on the well placement strategy until the oil-water interface of the high-dipping reservoir is discovered. Thus, by determining the structural line adjustment depth based on the formation dip angle of the high-dipping reservoir, and after the well placement on the current structural line is completed, the position of the next structural line can be determined based on the current structural line and the structural line adjustment depth, and then wells can continue to be placed on the next structural line until the oil-water interface is discovered. This gradual deployment method allows for simultaneous well placement and understanding of the geological characteristics of the high-dipping reservoir, thereby enabling the rational determination of the oil-water relationship in the high-dipping reservoir and improving the effective development of the reservoir.

[0128] The algorithms and displays provided herein are not inherently related to any particular computer, virtual system, or other device. Various general-purpose systems can also be used in conjunction with the teachings herein. The required structure for constructing such systems is apparent from the above description. Furthermore, this invention is not directed to any particular programming language. It should be understood that the contents of the invention described herein can be implemented using various programming languages, and the above description of specific languages ​​is for the purpose of disclosing the best mode of implementation of the invention.

[0129] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0130] Similarly, it should be understood that, in order to simplify this disclosure and aid in understanding one or more of the various aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be construed as reflecting an intention that the claimed invention requires more features than are expressly recited in each claim. Rather, as reflected in the following claims, inventive aspects lie in fewer than all features of a single foregoing disclosed embodiment. Therefore, the claims following the detailed description are hereby expressly incorporated into this detailed description, wherein each claim itself is a separate embodiment of the invention.

[0131] Those skilled in the art will understand that modules in the device of the embodiments can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiments can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components. Except where at least some of such features and / or processes or units are mutually exclusive, any combination can be used to combine all features disclosed in this specification (including the accompanying claims, abstract, and drawings) and all processes or units of any method or device so disclosed. Unless expressly stated otherwise, each feature disclosed in this specification (including the accompanying claims, abstract, and drawings) may be replaced by an alternative feature that serves the same, equivalent, or similar purpose.

[0132] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments can be used in any combination.

[0133] The various component embodiments of the present invention can be implemented in hardware, or as software modules running on one or more processors, or a combination thereof. Those skilled in the art will understand that microprocessors or digital signal processors (DSPs) can be used in practice to implement some or all of the functions of some or all of the components of the gateway, proxy server, or system according to embodiments of the present invention. The present invention can also be implemented as a device or apparatus program (e.g., a computer program and computer program product) for performing some or all of the methods described herein. Such programs implementing the present invention can be stored on a computer-readable medium or can be in the form of one or more signals. Such signals can be downloaded from an Internet website, provided on a carrier signal, or provided in any other form.

[0134] It should be noted that the above embodiments are illustrative of the invention and not restrictive, and that those skilled in the art can devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words can be interpreted as names.

[0135] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0136] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for well placement in a high-inclination reservoir, characterized in that, The method includes: Obtain the dip angle of the formation in the high-dipping reservoir, and determine the structural line adjustment depth based on the dip angle of the formation in the high-dipping reservoir; Based on a preset well placement strategy, wells are deployed on the current layer of the structural line. When the well placement on the current layer of the structural line is completed, the position of the next layer of the structural line is determined based on the position of the current layer of the structural line and the adjustment depth of the structural line. Based on the well placement strategy, wells are deployed on the next layer of structural line until the oil-water interface of the high-dipping reservoir is determined.

2. The method as described in claim 1, characterized in that, If the current layer construction line is the first layer construction line, the method further includes: Determine the oil-water interface of the high-angle reservoir; The location of the first structural line is determined as the position above the oil-water interface and at a distance of a preset first depth threshold from the oil-water interface of the high-dipping reservoir.

3. The method as described in claim 1, characterized in that, The method of determining the structural line adjustment depth based on the formation dip angle of the high-dipping reservoir includes: Determine the exploitable geological reserves of the high-angle oil reservoir; The oil-bearing area of ​​the high-angle oil reservoir is determined based on the exploitable geological reserves, the oil layer thickness of the high-angle oil reservoir, the effective porosity of the oil layer in the high-angle oil reservoir, the original oil saturation of the oil layer in the high-angle oil reservoir, the surface crude oil density of the high-angle oil reservoir, and the formation crude oil volume factor of the high-angle oil reservoir. The reservoir single-well operating radius of the high-angle reservoir is determined based on the oil-bearing area of ​​the high-angle reservoir; The structural line adjustment depth is determined based on the reservoir single-well operating radius of the high-dipping reservoir and the formation dip angle.

4. The method as described in claim 3, characterized in that, Determining the recoverable geological reserves of the high-angle reservoir includes: To obtain the economically recoverable reserves and calibrated recovery rate of the high-dipping reservoir; According to the formula Determine the exploitable geological reserves N of the high-angle oil reservoir; wherein, The N e E represents the economically recoverable reserves of the high-angle reservoir. R The calibrated recovery rate is given.

5. The method as described in claim 3, characterized in that, The determination of the oil-bearing area of ​​the high-angle oil reservoir based on the exploitable geological reserves, the oil layer thickness of the high-angle oil reservoir, the effective porosity of the oil layer in the high-angle oil reservoir, the original oil saturation of the oil layer in the high-angle oil reservoir, the surface crude oil density of the high-angle oil reservoir, and the formation crude oil volume factor of the high-angle oil reservoir includes: According to the formula Determine the oil-bearing area A0 of the high-angle reservoir; wherein, N represents the exploitable geological reserves of the high-angle reservoir, and B represents... oi φ is the formation crude oil volume factor of the high-angle reservoir, h0 is the oil layer thickness of the high-angle reservoir, φ is the effective porosity of the reservoir in the high-angle reservoir, and S is... oi ρ represents the original oil saturation of the oil layer in the high-angle reservoir, and ρ represents the surface crude oil density of the high-angle reservoir.

6. The method as described in claim 3, characterized in that, The determination of the reservoir single-well operational radius of the high-angle reservoir based on the oil-bearing area of ​​the high-angle reservoir includes: According to the formula Determine the reservoir single-well operating radius γ of the high-angle reservoir; wherein, A0 represents the oil-bearing area of ​​the high-angle reservoir.

7. The method as described in claim 3, characterized in that, The determination of the structural line adjustment depth based on the reservoir single-well operating radius and the formation dip angle of the high-dipping reservoir includes: The structural line adjustment depth χ is determined according to the formula χ=γ×tana; where γ is the reservoir single-well operating radius of the high-dipping reservoir, and a is the formation dip angle.

8. The method as described in claim 1, characterized in that, The well placement strategy based on preset well placement plans is used to deploy wells on the current layer of the structural line, including: Based on the seismic properties of the current structural line, the location of the control well on the current structural line is determined, and the control well is deployed on the current structural line based on the location of the control well. The control well is tested and produced. Based on the test production data, it is determined whether the control well is in an oil layer. If so, the remaining well positions are deployed on the current layer structure line based on the control well as the preset well spacing. If the control well is not located in an oil layer, the control well will be used as a water injection well, and the remaining well locations will no longer be deployed on the current structural line.

9. A well location deployment device for high-angle oil reservoirs, characterized in that, The device includes: The acquisition unit is used to acquire the dip angle of the formation in the high-dipping reservoir and determine the structural line adjustment depth based on the dip angle of the formation in the high-dipping reservoir. The first deployment unit is used to deploy well locations on the current layer structure line based on a preset well location deployment strategy. When the well location deployment on the current layer structure line is completed, the position of the next layer structure line is determined based on the position of the current layer structure line and the adjustment depth of the structure line. The second deployment unit is used to deploy well locations on the next layer of structural line based on the well location deployment strategy until the oil-water interface of the high-dipping reservoir is determined.

10. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method according to any one of claims 1-8.

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