Method and device for determining oil layer reserves during drilling

Abstract

The present invention discloses a method and device for determining oil layer reserves while drilling. The method includes: determining oil layer information for at least one oil layer in a structural oil reservoir; the oil layer information includes information about the oil layer top and bottom surfaces; determining the trapped volume of the oil layer based on other interface information during drilling and the oil layer information; the other interface information includes at least one of actual oil-water interface information, oil-bottom interface information, and predicted oil-water interface information; and determining the oil and gas reserves of the oil layer based on the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer. By implementing this solution, rapid reserve calculation of multiple oil (gas) layers can be achieved while drilling, significantly reducing workload, improving work efficiency, and reducing the likelihood of errors.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploration, and in particular to a method and device for determining oil layer reserves in a drilling-while-drilling process. Background Art

[0002] Oil (and natural gas) reserve calculation is a crucial step in oil exploration and development, requiring it throughout the entire process from oil and gas target evaluation and while-drilling drilling to later development. In oil and gas production, if a discovery is made, it's often necessary to calculate all newly added reserves and complete industrial mapping of the reservoir within 12 hours or even less of the arrival of forward data to facilitate further drilling decisions. Therefore, the accuracy requirements for while-drilling reserve calculations are lower than those in the development phase, but they require a higher degree of timeliness, requiring calculations to be completed within a short period of time.

[0003] Conventional methods for determining reservoir reserves while drilling rely entirely on manual calculations, which are labor-intensive, inefficient, time-consuming, and prone to errors. While modeling methods for calculating reservoir reserves during the development phase offer relatively accurate results, they suffer from complex algorithms, lengthy calculation times, and poor timeliness. Summary of the Invention

[0004] The present invention provides a method and device for determining oil layer reserves during drilling, which can realize rapid reserve calculation of multiple oil (gas) layers during drilling, greatly saving workload, improving work efficiency and reducing the possibility of errors.

[0005] According to one aspect of the present invention, a method for determining oil reservoir reserves during drilling is provided, the method comprising:

[0006] Determine oil layer information of at least one oil layer of the structural oil reservoir; the oil layer information includes oil layer top surface information and oil layer bottom surface information;

[0007] determining the trapped volume of the oil layer according to other interface information during drilling and oil layer information of the oil layer; the other interface information includes at least one of actual oil-water interface information, oil bottom interface information, and predicted oil-water interface information;

[0008] The oil and gas reserves of the oil layer are determined according to the trapped volume, the average porosity of the oil layer and the average irreducible water saturation of the oil layer.

[0009] According to another aspect of the present invention, a device for determining oil reservoir reserves during drilling is provided, the device comprising:

[0010] An oil layer information determination module, configured to determine oil layer information of at least one oil layer in the oil reservoir; the oil layer information includes oil layer top surface information and oil layer bottom surface information;

[0011] a trapped volume determination module, configured to determine the trapped volume of the oil layer based on other interface information during drilling and oil layer information of the oil layer; the other interface information including at least one of actual oil-water interface information, oil-bottom interface information, and predicted oil-water interface information;

[0012] The oil and gas reserve determination module is used to determine the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer and the average irreducible water saturation of the oil layer.

[0013] According to another aspect of the present invention, an electronic device is provided, comprising:

[0014] at least one processor; and

[0015] a memory communicatively connected to the at least one processor; wherein,

[0016] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for determining oil layer reserves while drilling according to any embodiment of the present invention.

[0017] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining oil layer reserves during drilling while drilling as described in any embodiment of the present invention when executed.

[0018] The technical solution of the embodiment of the present invention determines oil layer information of at least one oil layer in a structural oil reservoir; the oil layer information includes oil layer top surface information and oil layer bottom surface information; the trapped volume of the oil layer is determined based on other interface information during the drilling process and the oil layer information of the oil layer; the other interface information includes at least one of actual oil-water interface information, oil-bottom interface information, and predicted oil-water interface information; and the oil and gas reserves of the oil layer are determined based on the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer. By implementing the technical solution provided by the embodiment of the present invention, rapid reserve calculation of multiple oil (gas) layers can be achieved while drilling, significantly reducing workload, improving work efficiency, and reducing the possibility of errors.

[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1a This is a flow chart of a method for determining oil reservoir reserves during drilling, provided by an embodiment of the present invention;

[0022] Figure 1b Schematic diagram of batch generation of oil layer top surface and oil layer bottom surface provided by an embodiment of the present invention;

[0023] Figure 1c Schematic diagram of the coverage of proven reserves of bottom water oil reservoirs provided by an embodiment of the present invention;

[0024] Figure 1d Schematic diagram of coverage of the tertiary reserves of edge water reservoirs provided by an embodiment of the present invention;

[0025] Figure 1e This is a schematic diagram of a structural oil layer including multiple high points provided by an embodiment of the present invention;

[0026] Figure 1f This is a schematic diagram of multiple deformations for marking multiple high-point screening within the same enclosure provided by an embodiment of the present invention;

[0027] Figure 1g Schematic diagram of truncating a structural grid using proven reserve depth provided by an embodiment of the present invention;

[0028] Figure 1h Schematic diagram of high point screening results provided by an embodiment of the present invention;

[0029] Figure 1i This is a schematic diagram of using a marked polygon for multiple high point screening of the next oil layer provided by an embodiment of the present invention;

[0030] Figure 1j This is a schematic diagram of an oil-bearing structure in a depression provided by an embodiment of the present invention;

[0031] Figure 1k Schematic diagram of the top and bottom surfaces of an oil layer obtained by structural modeling according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic structural diagram of a device for determining oil reservoir reserves while drilling provided by an embodiment of the present invention;

[0033] Figure 3The present invention is a schematic structural diagram of an electronic device for implementing a method for determining oil layer reserves while drilling according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Figure 1a This is a flow chart of a method for determining oil layer reserves while drilling provided by an embodiment of the present invention. This embodiment is applicable to the case of determining oil layer reserves of a constructed oil reservoir while drilling. The method can be executed by an apparatus for determining oil layer reserves while drilling. The apparatus for determining oil layer reserves while drilling can be implemented in the form of hardware and / or software. The apparatus for determining oil layer reserves while drilling can be configured in an electronic device for determining oil layer reserves while drilling. Figure 1a As shown, the method includes:

[0037] S110: Determine oil layer information of at least one oil layer in the structural oil reservoir.

[0038] The oil layer information includes oil layer top surface information and oil layer bottom surface information.

[0039] Wherein, the structural oil reservoir contains at least one oil layer. This solution can first determine at least one control layer of the structural oil reservoir, and then use the structural modeling algorithm to determine the oil layer information of at least one oil layer between each control layer. The oil layer top surface information can be set according to actual needs, for example, it can be the oil layer top surface, specifically the depth of each point constituting the oil layer top surface. The oil layer bottom surface information can be set according to actual needs, for example, it can be the oil layer bottom surface, specifically the depth of each point constituting the oil layer bottom surface. This solution can determine the oil layer information of at least one oil layer of the structural oil reservoir in a variety of ways. For example, during the drilling process, when the top and bottom surfaces of the oil layer can be accurately identified on the seismic data, the top or bottom surface of the oil layer can be manually interpreted on the seismic data, and then the interpreted layers can be interpolated or gridded to form the top and bottom surfaces of the oil layer. Alternatively, if the seismic data quality is poor, making it difficult to accurately identify the top and bottom surfaces of the oil layer, a more easily identifiable event can be tracked above or below the reservoir. The interpreted horizon can then be interpolated or gridded, and finally the horizon can be drift-corrected to the top and bottom surfaces of the oil layer, respectively, to approximate the top and bottom surfaces of the oil layer. Alternatively, as oil and gas exploration progresses into the middle and deep layers, the quality of seismic data gradually degrades, making it increasingly difficult to accurately track the top and bottom surfaces of the oil and gas layer on the seismic profile. Furthermore, manual interpretation requires a long time, making it difficult to meet the timeliness requirements of while-drilling operations. Therefore, in actual while-drilling operations, a controlled layer drift correction method can be used. Alternatively, this solution can also use structural modeling to generate the top and bottom surfaces of the oil layer in batches.

[0040] In a feasible embodiment, optionally, determining the oil layer information of at least one oil layer of a structural oil reservoir includes: determining at least one control layer of the structural oil reservoir; the control layer is used to limit the depth range covered by the oil layer; using each of the control layers as a constraint condition, using a structural modeling algorithm to process the drilling data and seismic interpretation data to obtain the oil layer top surface information and oil layer bottom surface information of the oil layer.

[0041] For example, Figure 1b As shown, this approach uses seismic interpretation to identify at least one easily identifiable and relatively continuous symmetric axis above or below a structural reservoir and manually mark it, resulting in at least one control layer. Then, within the constraints of each control layer, a structural modeling algorithm is used to perform planar and spatial interpolation or gridding on the while-drilling and seismic interpretation data to establish a stratigraphic framework model, deriving the top and bottom layers of the oil reservoirs and generating the top and bottom surfaces of at least one oil layer.

[0042] By identifying at least one controlling layer of the reservoir structure, which limits the depth range covered by the reservoir, and using each controlling layer as a constraint, a structural modeling algorithm is used to process downhole data and seismic interpretation data to obtain information on the reservoir top and bottom surfaces. This method can quickly and accurately generate reservoir top and bottom surfaces in batches within a short period of time. It accurately simulates and restores the subsurface morphology, ensuring a reasonable inheritance of fault polygons at each level, facilitating subsequent mapping.

[0043] S120: Determine the trapped volume of the oil layer according to other interface information during the drilling process and the oil layer information of the oil layer.

[0044] The other interface information includes at least one of actual oil-water interface information, oil-bottom interface information and predicted oil-water interface information.

[0045] For example, the actual oil-water interface information can be set according to actual needs, for example, it can be the actual oil-water interface, specifically the depth of each point constituting the actual oil-water interface. When the structural reservoir is a bottom water reservoir, the actual oil-water interface can be determined based on the drilling data. The oil-bottom interface information can be set according to actual needs, for example, it can be the oil-bottom interface, specifically the depth of each point constituting the oil-bottom interface. When the structural reservoir is an edge water reservoir, the oil-bottom interface can also be determined based on the drilling data. The predicted oil-water interface information can be set according to actual needs, for example, it can be the predicted oil-water interface, specifically the depth of each point constituting the predicted oil-water interface. Other interface information can also include the lowest trap interface, that is, the interface composed of the positions where oil and gas disappear.

[0046] In this embodiment, optionally, the trapped volume of the oil layer is determined based on other interface information during the drilling process and the oil layer information of the oil layer, including: determining the actual oil-water interface based on the actual oil-water interface information, determining the oil layer top surface based on the oil layer top surface information, and determining the oil layer bottom surface based on the oil layer bottom surface information; determining the highest point depth of the oil layer bottom surface based on the oil layer bottom surface; taking the volume formed by the oil layer top surface and the actual oil-water interface as the trapped volume of the oil layer; the actual oil-water interface is higher than the highest point depth.

[0047] For example, taking the simplest structural reservoir - anticline structure (Qionglu structure) as an example, the space that can store oil and gas is the reservoir part between the lowest trap line and the highest point. According to the relationship between the oil (gas) water interface and the bottom of the oil layer, the structural reservoir can be divided into edge water reservoir and bottom water reservoir. If the oil-water interface is higher than the highest point depth of the bottom of the oil layer, it is a bottom water reservoir, such as Figure 1c Otherwise, it is an edge water reservoir, such as Figure 1dIn actual drilling, the basis for judgment is whether the well encounters the oil (gas)-water interface. If the oil (gas)-water interface is not encountered, the oil (gas)-water interface is below, which can be inferred as an edge water reservoir or a false bottom water reservoir. In this case, the plane passing through the intersection of the oil layer bottom and the well trajectory is called the drilled oil layer bottom interface, or simply the oil bottom interface.

[0048] After determining the reservoir information, this solution can determine the volume of the enclosed space (trapped volume) enclosed by the reservoir top and bottom, as well as the oil (gas)-water interface, and then determine the reservoir reserves based on the trapped volume. Common methods include scanning thickness extraction, slicing, and spatial segmentation. The first two methods are faster but less accurate and are suitable for areas with laterally stable strata and simple structures. The latter method is more accurate and suitable for areas with complex structures and significant lateral strata variation, but the calculation speed is slower. This solution proposes to use the first method to quickly calculate the trapped volume, thereby achieving better timeliness.

[0049] This solution can determine the highest point depth of the oil layer bottom surface based on the oil layer bottom surface. Since the actual oil-water interface is higher than the highest point depth, the volume formed by the actual oil-water interface and the oil layer top surface can be used as the trapped volume of the oil layer.

[0050] Therefore, by taking the volume formed by the top surface of the oil layer and the actual oil-water interface as the trapped volume of the oil layer, the trapped volume of the bottom water reservoir can be determined, providing a reliable data source for subsequent steps.

[0051] In a feasible embodiment, optionally, the trapped volume of the oil layer is determined based on other interface information during the drilling process and the oil layer information of the oil layer, including: determining the oil bottom interface based on the oil bottom interface information; taking the volume formed by the top surface of the oil layer and the oil bottom interface as the first volume; the oil bottom interface is lower than the highest point depth; taking the volume formed by the bottom surface of the oil layer and the oil bottom interface as the second volume; and taking the difference between the first volume and the second volume as the trapped volume of the oil layer.

[0052] Among them, such as Figure 1d As shown, during actual drilling, if the oil (gas)-water interface is not encountered, the oil (gas)-water interface is located below, which can be inferred as an edge-water reservoir or a false bottom-water reservoir. In this case, the plane passing through the intersection of the reservoir bottom and the well trajectory is called the encountered reservoir bottom interface, or simply the oil bottom interface. Because the oil bottom interface is lower than the highest point of the reservoir bottom, this scheme can use the volume formed by the oil bottom interface and the reservoir top as the first volume of the reservoir, the volume formed by the oil bottom interface and the reservoir bottom as the second volume of the reservoir, and the difference between the first and second volumes as the trapped volume of the reservoir. The proven reserves of the edge-water reservoir can then be determined based on this trapped volume.

[0053] Thus, by determining the oil-bottom interface based on the oil-bottom interface information; taking the volume formed by the oil layer top and the oil-bottom interface as the first volume; the oil-bottom interface being below the highest point; taking the volume formed by the oil layer bottom and the oil-bottom interface as the second volume; and taking the difference between the first and second volumes as the trapped volume of the oil layer, the trapped volume of edge-water reservoirs can be determined, providing a reliable data source for subsequent steps.

[0054] In this embodiment, optionally, the trapped volume of the oil layer is determined based on other interface information during the drilling process and the oil layer information of the oil layer, including: taking the volume determined by the predicted oil-water interface and the top surface of the oil layer as the third volume; taking the volume determined by the predicted oil-water interface and the bottom surface of the oil layer as the fourth volume; and taking the difference between the third volume and the fourth volume as the trapped volume of the oil layer.

[0055] Among them, such as Figure 1d As shown, if the structural reservoir is an edge-water reservoir or a false bottom-water reservoir, the true oil-water interface is below the bottom of the oil layer. This solution requires inferring the existing relevant data to obtain a predicted oil-water interface. For example, if an appraisal well encounters the oil-water interface in this layer, the drilling data is used to obtain the predicted oil-water interface. If drilling data is unavailable, the oil-water interface is fitted using MDT pressure measurement data, or the depth of the oil-water interface is roughly determined using sand body extrapolation based on the drilling history of other wells in the area. This is used as the predicted oil-water interface. This solution can use the volume determined by the predicted oil-water interface and the top of the oil layer as the third volume; the volume determined by the predicted oil-water interface and the bottom of the oil layer as the fourth volume; and the difference between the third and fourth volumes as the trapped volume of the oil layer. The controlled reserves of the edge-water reservoir are then determined based on this trapped volume and the proven reserves of the edge-water reservoir determined in the previous steps.

[0056] Thus, by using the volume determined by the predicted oil-water interface and the top of the oil layer as the third volume, the volume determined by the predicted oil-water interface and the bottom of the oil layer as the fourth volume, and the difference between the third and fourth volumes as the trapped volume of the oil layer, the trapped volume of edge-water reservoirs can be determined, providing a reliable data source for determining the controlled reserves of edge-water reservoirs.

[0057] S130: Determine the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer.

[0058] Among them, oil and gas reserves can include proven reserves, controlled reserves and predicted reserves. Figure 1c As shown in , for bottom water reservoirs, since the oil-water interface has been encountered, only the proven reserves (the reserves above the oil-water interface) need to be calculated. Figure 1dAs shown in the figure, for edge-water reservoirs, probable reserves refer to the reserves between the oil bottom contact encountered during drilling and the predicted oil-water contact. Predicted reserves are the reserves between the predicted oil-water contact and the lowest trap line (overflow point) of the structural reservoir. Predicted reserves cannot be confirmed using current logging data and are therefore considered suspected reserves. Actual calculations typically use the reserves between the lowest trap line and the highest point (total structural reserves) minus the proven and probable reserves.

[0059] In this embodiment, optionally, determining the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer includes: determining the oil and gas reserves of the oil layer based on the following formula: N = 100Vφ(1-S wi )ρ0 / B oi ;

[0060] Where V represents the trapped volume, N represents the proven reserves of the oil layer, φ represents the average porosity of the oil layer, S wi represents the average bound water saturation of the oil layer, ρ0 represents the average crude oil density, B oi Represents the average crude oil volume coefficient.

[0061] For example, average porosity, average bound water saturation, average crude oil density and average crude oil volume coefficient are all reservoir parameters. Reservoir parameters can generally be obtained through geophysical logging. If there is no geophysical logging data, it can be estimated from the surrounding wells. For example, assuming that well M is being drilled in the target area and there are no other wells drilled in the target area, the well drilling logging parameters of well M are used as reserve calculation parameters; if there are already wells drilled in the target area, the calculation parameters are obtained by arithmetic average or thickness-weighted average. Taking the calculation of average porosity as an example, assuming that wells M, W and R all encounter oil layer a, if the reservoir thicknesses encountered by the three wells are similar, the arithmetic average method can be used to determine the average porosity of oil layer a:

[0062]

[0063] Where, and Respectively represent the porosity parameters obtained from logging data of Well M, Well W, and Well R.

[0064] If the three wells encounter oil layers with greatly different thicknesses, this scheme can use the thickness-weighted average method to obtain the average porosity of the oil layer:

[0065]

[0066] Where H M 、H W and H Rrepresent the thickness of oil layer a encountered by Well M, Well W and Well R respectively; and Represent the porosity parameters obtained from well logging data for Wells M, W, and R, respectively. The process for determining the average irreducible water saturation of a reservoir is similar. Crude oil changes volume under high temperature and pressure underground. The crude oil volume coefficient represents the ratio of the above-ground volume of crude oil to the underground volume of crude oil. Because non-reservoir structures (such as mudstone interlayers or coal seams) are often considered within reservoirs, the thickness of a sandstone-mudstone formation is often used as the reservoir thickness (gross thickness) in reserve calculations. This is then multiplied by the net-to-gross ratio (the ratio of reservoir thickness to total formation thickness) to remove the non-reservoir components.

[0067] Therefore, by determining the oil and gas reserves of the oil layer based on the trapped volume, the average porosity of the oil layer and the average irreducible water saturation of the oil layer, the proven reserves of the oil layer in the structural oil reservoir can be determined.

[0068] In another feasible embodiment, optionally, determining the oil and gas reserves of the oil layer based on the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer includes: determining candidate reserves of the oil layer based on the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer; and taking the difference between the candidate reserves and the proven reserves as the controlled reserves of the oil layer.

[0069] Among them, such as Figure 1d As shown, this solution can be to determine the candidate reserves of the edge water reservoir oil layer based on the trapped volume of the edge water reservoir oil layer determined in the previous step, combined with the oil layer, average porosity, average irreducible water saturation of the oil layer, average crude oil density and average crude oil volume coefficient, and then use the difference between the candidate reserves and the proven reserves of the edge water reservoir oil layer determined in the previous step as the controlled reserves of the edge water reservoir oil layer.

[0070] Thus, the candidate reserves of the oil layer are determined based on the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer; and the difference between the candidate reserves and the proven reserves is used as the controlled reserves of the oil layer. This allows the controlled reserves of the oil layer in edge-water reservoirs to be determined.

[0071] In addition, the oil and gas structural reservoir may contain one structural high point or multiple structural high points. When the oil-water interface of the oil layer is lower than the lowest point (saddle) between the structures, multiple high points can be used as the same calculation unit to calculate the tertiary reserves at the same time. However, when the predicted oil-water interface of the oil layer is higher than the lowest point (saddle) between the structures, it is impossible to determine the oil and gas content of the high point without well control. Therefore, only the structural high point with well control can be used to calculate the proved reserves and controlled reserves. The traditional method is to limit the calculation range, such as Figure 1eAs shown, the structural reservoir is a fault-controlled anticline structure. Since there is no drilling in block B and the predicted oil-water interface of the oil layer is higher than the saddle, it is impossible to determine the oil and gas content of the block. Therefore, when determining the proven reserves and controlled reserves, the grid needs to be intercepted, and only the enclosed block A is retained, so as to exclude the influence of other high points. However, since the anticline structure is controlled by faults, the structural highs will move in the opposite direction of the fault dip from shallow to deep, and the structure itself will also change from shallow to deep. Therefore, the interception range will be wrong when intercepting deep oil layers. Not only will the structure where the A high point is located be cut off, but the high point on the other side of the fault will also be included in the calculation range. If the interception range is drawn for all oil layers separately, it will take a lot of time and the timeliness is low. This plan uses the calculation of the proven reserves of the oil layer as an example to provide a solution: Figure 1f-Figure 1i As shown in the figure, 1) a polygon for marking is given: a smaller polygon is set at the structural high point of the first oil layer at the top where the reserves need to be calculated; 2) the structural grid is truncated using the proven reserves depth, retaining only the part with the proven reserves depth (the oil bottom depth is assumed to be 3500 meters). At this time, the top surface grid of the oil layer will be truncated into several isolated grid blocks; 3) the intersection of the marking polygon given in the first step and the truncated structural grid is calculated, and the grid block with a non-zero intersection area with the polygon is the desired structural high point. The selected grid block can then be used to calculate the proven reserves; 4) the grid is moved a distance in the opposite direction of the fault dip (the distance can be given by testing) to match the next oil layer, thereby starting the calculation of other oil layers and finally obtaining the reserves of all oil layers.

[0072] After the determination of the reserves of the oil layer is completed, this solution can map the oil layer. Generally, industrial mapping requires two types of identification data: 1) grid borders, latitude and longitude grids, compasses and other indicative identifications; 2) grids, fault polygons, scales, well points and other geological engineering identifications. The first type of identification needs to be set manually; the second type of identification can be obtained through a series of processes mentioned above. Therefore, the production of structural maps can be divided into the following steps: 1) Make a base map, which includes the first type of identification and some second type identifications such as well points; 2) Copy the base map, and successively overlay the proven reserves grid, controlled reserves grid, predicted reserves grid, fault polygons and other identifications on the copied base map. Repeat this process cyclically to obtain an industrial structural map of all oil layers in the structural reservoir.

[0073] For example, Figure 1jAs shown, this scheme takes a certain oil-bearing structure in a certain depression as an example to illustrate the detailed implementation steps. The structure is a block structure controlled by a continuously developing large fault and several small faults around it. There are three high points in the structure, of which the high point A on the north side is where the well is located. A total of 35 oil layers have been drilled in this structure. There is only one well in the area, so the porosity and other parameters obtained by the well logging while drilling are used as reservoir parameters. The following takes the well's reserves calculation while drilling as an example to explain the method in detail. The top surface of the well is the T80 layer, the bottom surface is the T81 layer, and there are several control layers in the middle, such as WC121, WC145, WC156 and WC161. These layers and faults in the target area have been manually interpreted in the target evaluation stage. Next, the interpreted layers and faults, as well as the top and bottom surfaces of the oil layers obtained by drilling, can be used to perform structural modeling to obtain the top and bottom surfaces of the oil layers, as shown in the figure. Figure 1k For example.

[0074] This solution, once the top and bottom surfaces of each oil layer are determined, can be used to batch calculate the reserves of the structural reservoir. This structure has 35 oil layers. Given the top and bottom surfaces, a skilled explorer would need 3-5 minutes to calculate the tertiary reserves for a single layer, and 8-10 minutes to generate a structural map of the layer. This workload increases significantly if the layer stratification scheme or the oil-water contact depth changes, requiring recalculation of reserves. Using this solution, generating the map takes only 15-20 seconds. Because the charts are derived from a single data source, reserve quality control can be performed directly by inspecting the structural map. If the structural map matches the expected reserve calculation results, the results are considered correct.

[0075] The technical solution of the embodiment of the present invention determines oil layer information of at least one oil layer in a structural oil reservoir; the oil layer information includes oil layer top surface information and oil layer bottom surface information; the trapped volume of the oil layer is determined based on other interface information during the drilling process and the oil layer information of the oil layer; the other interface information includes at least one of actual oil-water interface information, oil-bottom interface information, and predicted oil-water interface information; and the oil and gas reserves of the oil layer are determined based on the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer. By implementing the technical solution provided by the embodiment of the present invention, rapid reserve calculation of multiple oil (gas) layers can be achieved while drilling, significantly reducing workload, improving work efficiency, and reducing the possibility of errors.

[0076] Figure 2 Schematic diagram of the structure of the device for determining oil reserves during drilling provided by an embodiment of the present invention. Figure 2 As shown, the device includes:

[0077] The oil layer information determination module 210 is used to determine the oil layer information of at least one oil layer in the oil reservoir; the oil layer information includes the oil layer top surface information and the oil layer bottom surface information;

[0078] The trapped volume determination module 220 is configured to determine the trapped volume of the oil layer based on other interface information during drilling and oil layer information of the oil layer; the other interface information includes at least one of actual oil-water interface information, oil-bottom interface information, and predicted oil-water interface information;

[0079] The oil and gas reserve determination module 230 is configured to determine the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer.

[0080] Optionally, the oil layer information determination module 210 and the control layer determination unit are used to determine at least one control layer of the structural oil reservoir; the control layer is used to limit the depth range covered by the oil layer; the oil layer information determination unit is used to use each of the control layers as a constraint condition, and use a structural modeling algorithm to process the drilling data and seismic interpretation data to obtain the oil layer top surface information and oil layer bottom surface information of the oil layer.

[0081] Optionally, the trapped volume determination module 220 includes an oil-water interface determination unit, configured to determine the actual oil-water interface based on the actual oil-water interface information, determine the oil layer top surface based on the oil layer top surface information, and determine the oil layer bottom surface based on the oil layer bottom surface information; a highest point depth determination unit, configured to determine the highest point depth of the oil layer bottom surface based on the oil layer bottom surface; and a first trapped volume determination unit, configured to use the volume formed by the oil layer top surface and the actual oil-water interface as the trapped volume of the oil layer; the actual oil-water interface is higher than the highest point depth.

[0082] Optionally, the trapped volume determination module 220 includes an oil-bottom interface determination unit, configured to determine the oil-bottom interface based on the oil-bottom interface information; a first volume determination unit, configured to use the volume formed by the top surface of the oil layer and the oil-bottom interface as a first volume; the oil-bottom interface is lower than the highest point depth; a second volume determination unit, configured to use the volume formed by the bottom surface of the oil layer and the oil-bottom interface as a second volume; and a second trapped volume determination unit, configured to use the difference between the first volume and the second volume as the trapped volume of the oil layer.

[0083] Optionally, the oil and gas reserve determination module 230 is specifically configured to determine the oil and gas reserves of the oil layer based on the following formula: N = 100Vφ(1-S wi )ρ0 / B oi ; Wherein, V represents the trapped volume, N represents the proven reserves of the oil layer, φ represents the average porosity of the oil layer, S wi represents the average bound water saturation of the oil layer, ρ0 represents the average crude oil density, B oi Represents the average crude oil volume coefficient.

[0084] Optionally, the trapped volume determination module 220 includes a third volume determination unit, configured to use the volume determined by the predicted oil-water interface and the top surface of the oil layer as a third volume; a fourth volume determination unit, configured to use the volume determined by the predicted oil-water interface and the bottom surface of the oil layer as a fourth volume; and a third trapped volume determination unit, configured to use the difference between the third volume and the fourth volume as the trapped volume of the oil layer.

[0085] Optionally, the oil and gas reserve determination module 230 includes a candidate reserve determination unit, which is used to determine the candidate reserves of the oil layer based on the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer; and a controlled reserve determination unit, which is used to use the difference between the candidate reserves and the proven reserves as the controlled reserves of the oil layer.

[0086] The device for determining oil layer reserves while drilling provided by an embodiment of the present invention can execute the method for determining oil layer reserves while drilling provided by any embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.

[0087] Figure 3 A schematic diagram of the structure of an electronic device 40 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0088] like Figure 3 As shown, the electronic device 40 includes at least one processor 41 and a memory, such as a read-only memory (ROM) 42, a random access memory (RAM) 43, etc., which is communicatively connected to the at least one processor 41. The memory stores a computer program that can be executed by the at least one processor, and the processor 41 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 42 or the computer program loaded from the storage unit 48 into the random access memory (RAM) 43. Various programs and data required for the operation of the electronic device 40 can also be stored in the RAM 43. The processor 41, ROM 42, and RAM 43 are connected to each other via a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0089] Multiple components in the electronic device 40 are connected to the I / O interface 45, including an input unit 46, such as a keyboard, a mouse, etc.; an output unit 47, such as various types of displays, speakers, etc.; a storage unit 48, such as a magnetic disk, an optical disk, etc.; and a communication unit 49, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 49 allows the electronic device 40 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0090] Processor 41 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, digital signal processors (DSPs), and any other suitable processors, controllers, microcontrollers, etc. Processor 41 executes the various methods and processes described above, such as the method for determining reservoir reserves while drilling.

[0091] In some embodiments, the method for determining reservoir reserves while drilling can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 48. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 40 via ROM 42 and / or communication unit 49. When the computer program is loaded into RAM 43 and executed by processor 41, one or more steps of the method for determining reservoir reserves while drilling described above can be performed. Alternatively, in other embodiments, processor 41 can be configured to execute the method for determining reservoir reserves while drilling in any other suitable manner (e.g., via firmware).

[0092] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0093] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0094] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0095] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0096] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0097] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0098] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0099] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for determining oil reservoir reserves during drilling, characterized in that: include: determining oil layer information of at least one oil layer of the structural oil reservoir; The oil layer information includes oil layer top surface information and oil layer bottom surface information; determining the trapped volume of the oil layer according to other interface information during drilling and oil layer information of the oil layer; the other interface information includes at least one of actual oil-water interface information, oil bottom interface information, and predicted oil-water interface information; determining the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer and the average irreducible water saturation of the oil layer; Determining oil layer information of at least one oil layer in a structural oil reservoir, including: Determining at least one control layer of the structural oil reservoir; the control layer is used to limit the depth interval covered by the oil layer; Taking each of the control layers as a constraint condition, a structural modeling algorithm is used to process the drilling data and the seismic interpretation data to obtain the oil layer top surface information and the oil layer bottom surface information of the oil layer; the processing of the drilling data and the seismic interpretation data includes plane interpolation calculation, spatial interpolation calculation or grid processing of the drilling data and the seismic interpretation data.

2. The method according to claim 1, characterized in that Determining the trapped volume of the oil layer according to other interface information during drilling and oil layer information of the oil layer includes: determining the actual oil-water interface according to the actual oil-water interface information, determining the top surface of the oil layer according to the oil layer top surface information, and determining the bottom surface of the oil layer according to the oil layer bottom surface information; Determining the depth of the highest point of the bottom surface of the oil layer according to the bottom surface of the oil layer; The volume formed by the top surface of the oil layer and the actual oil-water interface is taken as the trapped volume of the oil layer; the actual oil-water interface is higher than the depth of the highest point.

3. The method according to claim 2, characterized in that Determining the trapped volume of the oil layer according to other interface information during drilling and oil layer information of the oil layer includes: determining the oil bottom interface according to the oil bottom interface information; The volume formed by the top surface of the oil layer and the oil bottom interface is taken as the first volume; the oil bottom interface is lower than the depth of the highest point; The volume formed by the bottom surface of the oil layer and the oil-bottom interface is used as the second volume; The difference between the first volume and the second volume is taken as the trapped volume of the oil layer.

4. The method according to claim 3, characterized in that Determining the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer includes: The oil and gas reserves of the oil layer are determined based on the following formula: N=100Vφ(1-S wi )ρ0 / B oi ; Where V represents the trapped volume, N represents the proven reserves of the oil layer, φ represents the average porosity of the oil layer, S wi represents the average bound water saturation of the oil layer, ρ0 represents the average crude oil density, B oi Represents the average crude oil volume coefficient.

5. The method according to claim 4, characterized in that Determining the trapped volume of the oil layer according to other interface information during drilling and oil layer information of the oil layer includes: The volume determined by the predicted oil-water interface and the top surface of the oil layer is used as a third volume; The volume determined by the predicted oil-water interface and the bottom of the oil layer is used as a fourth volume; The difference between the third volume and the fourth volume is taken as the trapped volume of the oil layer.

6. The method according to claim 5, characterized in that Determining the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer includes: determining candidate reserves of the oil layer according to the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer; The difference between the candidate reserves and the proven reserves is used as the controlled reserves of the oil layer.

7. A device for determining oil reservoir reserves during drilling, characterized in that: include: An oil layer information determination module, used to determine oil layer information of at least one oil layer in the structural oil reservoir; The oil layer information includes oil layer top surface information and oil layer bottom surface information; a trapped volume determination module, configured to determine the trapped volume of the oil layer based on other interface information during drilling and oil layer information of the oil layer; the other interface information including at least one of actual oil-water interface information, oil-bottom interface information, and predicted oil-water interface information; an oil and gas reserve determination module, configured to determine the oil and gas reserves of the oil layer according to the trapped volume, the average porosity of the oil layer, and the average irreducible water saturation of the oil layer; An oil layer information determination module and a control layer determination unit are configured to determine at least one control layer of the structural oil reservoir; the control layer is configured to limit the depth interval covered by the oil layer; the oil layer information determination unit is configured to use each of the control layers as a constraint condition and adopt a structural modeling algorithm to process the while-drilling data and the seismic interpretation data to obtain the oil layer top surface information and the oil layer bottom surface information of the oil layer; the processing of the while-drilling data and the seismic interpretation data includes performing plane interpolation calculations, spatial interpolation calculations or gridding processing on the while-drilling data and the seismic interpretation data.

8. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the method for determining oil reservoir reserves while drilling according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the method for determining oil layer reserves in a drilling-while-drilling process according to any one of claims 1 to 6 when executed.

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