CN106979002B - Method and device for determining predicted section of branch horizontal well - Google Patents
Method and device for determining predicted section of branch horizontal well Download PDFInfo
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Abstract
The embodiment of the application provides a method and a device for determining a branch horizontal well prediction section, wherein the method comprises the following steps: acquiring three-dimensional seismic data of a target area and borehole data of a plurality of completed wells in the target area; establishing a communicating graph of a plurality of branch horizontal sections on two sides of the main horizontal section by using a virtual well according to well hole data and three-dimensional seismic data of the completed well; and determining the predicted section of the branch horizontal well according to the connected graphs of the plurality of branch horizontal sections. According to the scheme, the well completion and three-dimensional seismic data are utilized, the virtual well is established, the spatial information (such as well depth and reservoir thickness) of the virtual well is obtained, and then the vertical connection diagram of the branch horizontal section is established, so that the three-dimensional branch horizontal well prediction section is constructed. Therefore, the technical problems of poor prediction precision and inaccurate data representation caused by the fact that the existing branch horizontal prediction section method only can construct and use a two-dimensional section and cannot represent oil reservoir spatial information are solved.
Description
Technical Field
The application relates to the technical field of oil and gas reservoir development, in particular to a method and a device for determining a predicted section of a branch horizontal well.
Background
The horizontal well is an important means for developing oil and gas reservoirs at present, and the oil drainage area of an oil layer is enlarged to improve the yield of an oil well. The branched horizontal well can further increase oil drainage area, increase oil well yield, improve oil production speed, save drilling cost and the like. Before deploying the branch horizontal well, research and analysis are generally required to be performed on a target area, and a branch horizontal well prediction section is established. And then the prediction section can be used as a construction basis to carry out specific deployment construction of the branched horizontal well. Therefore, it is important how to determine a more accurate branch horizontal well prediction profile.
The existing determination method of the section of the branched horizontal well is usually to simply use a finished well in a target area to establish a two-dimensional prediction section map. Such two-dimensional prediction profiles do not adequately account for variations in the thickness of the reservoir within the zone, nor do they adequately characterize the spatial information (e.g., well depth and reservoir thickness) of the reservoir in the target zone. Therefore, when the two-dimensional prediction profile is used in concrete implementation, the oil layer drilling and encountering rate of the horizontal well is relatively low, and the effect of deploying the branch horizontal well is relatively poor. Therefore, when the existing determination method for the section of the branch horizontal well is implemented specifically, the technical problems of poor prediction precision and inaccurate data representation often exist.
In view of the above problems, no effective solution has been proposed.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining a prediction section of a branch horizontal well, and aims to solve the technical problems of poor prediction precision and inaccurate data representation in the existing method.
The embodiment of the application provides a method for determining a predicted section of a branch horizontal well, which comprises the following steps:
acquiring three-dimensional seismic data of a target area and borehole data of a plurality of completed wells in the target area;
establishing a plurality of virtual wells in each branch horizontal section of a plurality of branch horizontal sections at two sides of the main horizontal section according to the three-dimensional seismic data and the well bore data of the plurality of completed wells, and acquiring the well depth and the oil layer thickness of each virtual well of the plurality of virtual wells;
establishing a communicating graph of each branch horizontal section in the plurality of branch horizontal sections according to the well depths and the oil reservoir thicknesses of the plurality of virtual wells;
and determining the branch horizontal well prediction section according to the connected graph of the plurality of branch horizontal sections.
In one embodiment, after determining the lateral horizontal well predicted profile, the method further comprises:
and deploying the branched horizontal well in the target area according to the predicted section of the branched horizontal well.
In one embodiment, establishing a plurality of virtual wells in each of a plurality of branch levels on either side of a main level and obtaining a well depth and a reservoir thickness for each of the plurality of virtual wells based on the three-dimensional seismic data and wellbore data for the plurality of completed wells comprises: respectively establishing a plurality of virtual wells in the plurality of branch horizontal sections, and acquiring the well depth and the reservoir thickness of each virtual well in the plurality of virtual wells:
determining a first pseudo well for the branch horizontal segment based on a connection of two of the plurality of completed wells;
determining the well depth and the oil layer thickness of a first virtual well according to the well hole data of the completed well within a preset range of the first virtual well;
determining the direction of the branch horizontal section according to the well depth and the oil reservoir thickness of the first virtual well and the three-dimensional seismic data;
determining a second virtual well of the branch horizontal segment along the direction of the branch horizontal segment;
and determining the well depth and the reservoir thickness of the second virtual well according to the well hole data of the completed well within the preset range of the second virtual well.
In one embodiment, determining a first pseudo well for a branch horizontal segment based on a line connecting two of the plurality of completed wells comprises:
taking the intersection point of the extension lines of the connecting lines of the two well completion wells on the same side of the main horizontal section and the main horizontal section as the position of the first virtual well of the branch horizontal section;
and/or the presence of a gas in the gas,
and taking the intersection point of the connecting line of the two well completion wells on different sides of the main horizontal section and the main horizontal section as the position of the first virtual well of the branch horizontal section.
In one embodiment, the determining the well depth and the reservoir thickness of the first virtual well according to the wellbore data of the completed well within a preset range of the first virtual well comprises:
and determining the well depth and the oil layer thickness of the first virtual well through an interpolation algorithm according to the well bore data of the completed well within the preset range of the first virtual well.
In one embodiment, determining the orientation of the branch horizontal segment from the three-dimensional seismic data, the reservoir thickness and the well depth of the first virtual well comprises:
and selecting the direction of the oil layer with the stability reaching a preset threshold value as the direction of the branch horizontal section according to the well depth and the oil layer thickness of the first virtual well and the three-dimensional seismic data.
In one embodiment, establishing a connectivity map of a plurality of branch horizontal segments on both sides of a main horizontal segment according to well depths and reservoir thicknesses of the plurality of virtual wells comprises:
determining the oil layer change condition of the region of each branch horizontal section according to the well depth and the oil layer thickness of the first virtual well and the well depth and the oil layer thickness of the second virtual well of each branch horizontal section in the plurality of branch horizontal sections;
and determining a communicating graph of the branch horizontal section according to the change condition of the oil layer of the region where the branch horizontal section is located.
In one embodiment, after determining the connectivity map of the branch level segment according to the reservoir variation of the region in which the branch level segment is located, the method further includes:
determining whether the connectivity of the connected graph of the branch horizontal segment meets a preset requirement;
if the preset requirement is not met, the direction of the branch horizontal segment is redetermined.
In one embodiment, determining a branch horizontal well predicted profile from a connectivity map of the plurality of branch horizontal segments comprises:
establishing a three-dimensional section according to the communication graph of the plurality of branch horizontal sections;
and marking the well depth and the oil reservoir thickness of the first virtual well of each branch horizontal section and the well depth and the oil reservoir thickness of the second virtual well of each branch horizontal section on the three-dimensional profile to obtain the branch horizontal well prediction profile.
Based on the same inventive concept, the embodiment of the application also provides a device for determining the predicted section of the branch horizontal well, which comprises the following steps:
the acquisition module is used for acquiring three-dimensional seismic data of a target area and borehole data of a plurality of completed wells in the target area;
a first establishing module, configured to establish a plurality of virtual wells in each of the plurality of branch horizontal segments on both sides of the main horizontal segment according to the three-dimensional seismic data and the wellbore data of the plurality of completed wells, and obtain a well depth and an oil layer thickness of each of the plurality of virtual wells;
the second establishing module is used for establishing a communicating graph of each branch horizontal section in the plurality of branch horizontal sections according to the well depths and the oil reservoir thicknesses of the plurality of virtual wells;
and the determining module is used for determining the branch horizontal well prediction section according to the connected graph of the plurality of branch horizontal sections.
In one embodiment, the apparatus further comprises:
and the deployment module is used for deploying the branched horizontal well in the target area according to the predicted section of the branched horizontal well.
In one embodiment, the first establishing module comprises:
a first determination unit for determining a first pseudo well of the branch horizontal section according to a connection line of two of the plurality of completed wells;
the second determining unit is used for determining the well depth and the oil layer thickness of the first virtual well according to the well bore data of the completed well in the preset range of the first virtual well;
the third determining unit is used for determining the direction of the branch horizontal section according to the well depth and the oil reservoir thickness of the first virtual well and the three-dimensional seismic data;
a fourth determination unit for determining a second virtual well of the branch horizontal segment along the direction of the branch horizontal segment;
and the fifth determining unit is used for determining the well depth and the reservoir thickness of the second virtual well according to the well bore data of the completed well within the preset range of the second virtual well.
In the embodiment of the application, the well completion and three-dimensional seismic data are utilized to establish the virtual well and obtain the spatial information of the virtual well, the well depth and the oil layer thickness in a target area are fully considered, the connected graph of a plurality of branch horizontal sections is established to establish the three-dimensional branch horizontal well prediction section, so that the specific spatial information of an oil layer can be comprehensively and accurately represented through the three-dimensional branch horizontal well prediction section, the drilling encountering rate of the horizontal oil layer is improved, the technical problems of poor prediction precision and inaccurate data representation in the existing method are solved, and the technical effects of accurately predicting the branch horizontal well and guiding the deployment of the branch horizontal well are achieved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
Fig. 1 is a process flow diagram of a method for determining a predicted profile of a branch horizontal well according to an embodiment of the present application;
fig. 2 is a configuration diagram of a device for determining a predicted cross section of a branch horizontal well according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When the conventional determination method for analyzing the predicted section of the branch horizontal well is implemented, specific oil layer data in a target area, particularly spatial information of an oil layer, such as thickness change of the oil layer, well depth and the like, is not fully analyzed and utilized. Therefore, the established two-dimensional horizontal well prediction section cannot well represent the spatial information in the oil layer. When the two-dimensional horizontal well is used for predicting a horizontal oil layer of a profile, the drilling contact rate is relatively low, and the effect of deploying a branch horizontal well is relatively poor. Aiming at the root cause of the problems, the method can firstly utilize well hole data of the drilled well to establish a virtual well; further, the virtual well, the completed well and the seismic data can be utilized to obtain the spatial information of the oil layer in the target area so as to establish a communicating graph of a plurality of branch horizontal sections; and determining a three-dimensional horizontal well prediction section according to the connected graph of the plurality of branch horizontal sections. Therefore, the spatial information (well depth, oil layer thickness and the like) of the oil layer can be accurately represented by the obtained three-dimensional horizontal well prediction section. Therefore, the technical problems of poor prediction precision and inaccurate data representation in the existing method are solved, and the technical effect of accurately guiding the deployment of the branch horizontal well is achieved.
Based on the thought, the embodiment of the application provides a method for determining the prediction section of the branch horizontal well. Please refer to the process flow diagram of the method for determining the predicted profile of the branch horizontal well in fig. 1. The method for determining the predicted section of the branch horizontal well provided by the embodiment of the application can comprise the following steps (including steps 101 to 104).
Step 101: three-dimensional seismic data of the target area and wellbore data of a plurality of completed wells in the target area are obtained.
Step 102: and establishing a plurality of virtual wells in each branch horizontal section in the plurality of branch horizontal sections on two sides of the main horizontal section according to the three-dimensional seismic data and the well bore data of the plurality of completed wells, and acquiring the well depth and the oil layer thickness of each virtual well in the plurality of virtual wells.
In one embodiment, in order to establish a desired virtual well and obtain spatial information (strength of the virtual well and thickness of the reservoir) of the virtual well, a plurality of virtual wells in the plurality of branch horizontal segments may be respectively established according to the following steps (S1 to S5), and further the well depth and the thickness of the reservoir of each of the plurality of virtual wells may be obtained.
S1: a first pseudo well of the branch horizontal segment is determined based on a connection of two of the plurality of completed wells.
In this embodiment, it should be noted that the above-mentioned virtual well is generally referred to as a virtual vertical well, and is not a real completed well, that is, it is assumed that it is a vertical well at a certain position, and information data of the vertical well, such as spatial information, is acquired through a nearby completed well: well depth, reservoir thickness, etc.
In one embodiment, in order to determine the position of the first virtual well, the position of the first virtual well of the branch horizontal segment may be determined by an intersection point of an extension line of a connecting line of two completed wells on the same side of the main horizontal segment and the main horizontal segment; the intersection of the line connecting the two completed wells on different sides of the main horizontal section with the main horizontal section may also be used as the location of the first virtual well of the branch horizontal section. The specific selection of which way to determine the position of the first virtual well can be flexibly selected according to specific conditions and specific requirements.
S2: and determining the well depth and the reservoir thickness of the first virtual well according to the well hole data of the completed well within the preset range of the first virtual well.
In one embodiment, in order to determine spatial information of a first virtual well, wherein the spatial information may specifically include data of a well depth and a reservoir thickness of the first virtual well, the well depth and the reservoir thickness of the first virtual well may specifically be determined by an interpolation algorithm according to wellbore data of a completed well within a preset range of the first virtual well. That is, interpolation calculation is performed on the virtual well using data of a known completed well, and data of a desired virtual well is acquired. For example, the well depths of the completed well a and the completed well B at both ends of the virtual well are 900 meters and 800 meters, respectively, and in particular, the well depth of the virtual well at a position between two completed wells can be 850 meters by interpolation calculation according to the well depth of the completed well a and the well depth of the completed well B. It should be noted that the method mainly performs interpolation calculation according to data of the oil reservoir profile, so as to obtain data of the well depth, the oil reservoir thickness and the like of the first virtual well. In practice, the distance between two completed wells is generally 70 m to 100 m. If other data of the virtual well are required to be calculated, or the data of the virtual well are calculated more accurately, or the data of the virtual well between the well bores which are far away from the completion well are calculated, during specific implementation, the data of the oil deposit profile can be comprehensively utilized to be combined with the data of the seismic profile to carry out interpolation operation, so that the data of the corresponding virtual well can be obtained. Of course, the process of obtaining the spatial information of the virtual well is realized by compiling the software of the oil reservoir profile by using a corresponding algorithm.
In this embodiment, it should be noted that the spatial information of the virtual well may specifically include the well depth and the reservoir thickness of the virtual well, and may also include other corresponding data. In the present embodiment, the spatial information of the virtual well is obtained by using an interpolation algorithm, and in the specific implementation, the required information data may be obtained by using another algorithm according to the specific situation. The present application is not limited thereto.
S3: and determining the direction of the branch horizontal section according to the well depth and the oil reservoir thickness of the first virtual well and the three-dimensional seismic data.
In one embodiment, in order to improve the oil production effect of the branch horizontal well, when determining the direction of the branch horizontal segment, specifically, a direction in which the stability of the oil reservoir reaches a preset threshold may be selected as the direction of the branch horizontal segment according to the well depth and the oil reservoir thickness of the first virtual well and the three-dimensional seismic data. For example, with the first virtual well as a starting point, the thicknesses of oil layers in the rightmost east direction, the rightmost west direction and the rightmost north direction are all sharply reduced, while the thickness variation of the oil layer in the rightmost south direction is small, and the relative stability is good. In this case, the stability of the oil layer in the southwest direction may be considered to reach a preset threshold, and the southwest direction is taken as the branch direction of the branch horizontal segment.
S4: determining a second virtual well of the branch horizontal segment along the direction of the branch horizontal segment.
In one embodiment, in order to determine the location of the second virtual well in the branch horizontal segment, in practice, the location method of the first virtual well may be referred to, and along the direction of the branch horizontal segment, the seismic data and the reservoir thickness variation are combined, and a suitable location is selected as the location of the second virtual well in the branch horizontal segment.
S5: and determining the well depth and the reservoir thickness of the second virtual well according to the well hole data of the completed well within the preset range of the second virtual well.
In one embodiment, in order to determine the well depth and the reservoir thickness of the second virtual well of the branch horizontal segment, in practice, the method for determining the well depth and the reservoir thickness of the first virtual well may be referred to, that is, the well depth and the reservoir thickness of the second virtual well may be determined by an interpolation algorithm according to the wellbore data of the completed well within the preset range of the second virtual well. Similar steps are not described in detail herein.
Step 103: and establishing a communication graph of each branch horizontal section in the plurality of branch horizontal sections according to the well depths and the reservoir thicknesses of the plurality of virtual wells.
In one embodiment, in order to establish the connection pattern of the plurality of branch horizontal segments on both sides of the main horizontal segment, the following steps (including S1 to S2) may be performed in detail.
S1: and determining the oil layer change condition of the region of each branch horizontal section according to the well depth and the oil layer thickness of the first virtual well and the well depth and the oil layer thickness of the second virtual well of each branch horizontal section in the plurality of branch horizontal sections.
S2: and determining a communicating graph of the branch horizontal section according to the change condition of the oil layer of the region where the branch horizontal section is located.
In one embodiment, in order to ensure that the obtained connection graph meets the requirement, and thus a more accurate branch horizontal well prediction profile can be obtained, in a specific implementation, after determining the connection graph of the branch horizontal segment, the method may further include the following steps (including S1 to S2).
S1: and determining whether the connectivity of the connected graph of the branch horizontal segment meets the preset requirement.
S2: if the preset requirement is not met, the direction of the branch horizontal segment is redetermined.
In this embodiment, the preset requirement for the connectivity of the connectivity graph may be specifically that the variation of the thickness of the oil layer in the connectivity graph, which is changed by the well depth of each virtual well and the completed well in the connectivity graph, is within a limit range. For example, the difference between the thickness of the oil layer at each position in the connected graph and the average thickness of the oil layer in the connected graph is less than or equal to 60 meters, in this case, the connected graph can be considered to meet the preset requirement, otherwise, the obtained connected graph of the branch horizontal segment can be considered to not meet the preset requirement, and the direction of the branch horizontal segment needs to be determined again to obtain the connected graph of the branch horizontal segment meeting the preset requirement.
Of course, the above listed preset requirements are only a schematic illustration for better explaining the embodiments of the present application, and in specific implementation, the corresponding preset requirements may be determined according to specific situations to detect whether the obtained connection diagram is appropriate, and whether the direction of the branch horizontal segment needs to be determined again to obtain a more appropriate connection diagram.
Step 104: and determining the branch horizontal well prediction section according to the connected graph of the plurality of branch horizontal sections.
In one embodiment, in order to establish a more accurate branch horizontal well prediction profile, the branch horizontal well prediction profile may be determined according to a connectivity graph of the plurality of branch horizontal segments. The specific implementation may include the following steps (S1 to S2).
S1: and establishing a three-dimensional section according to the communication graph of the plurality of branch horizontal sections.
In the present embodiment, since the spatial information (well depth and reservoir thickness) of the virtual well in the target region, the well depth and reservoir thickness of the completed well, and the reservoir thickness of the target region have been obtained, since the three-dimensional sectional view can be established based on the connected view of the horizontal segments of the respective branches. It should be noted that, the three-dimensional cross-sectional view, unlike the two-dimensional cross-sectional view used in the prior art, can clearly represent spatial information such as the thickness of the oil layer in the target region. Therefore, the position and the relevant condition of the branch horizontal well can be more accurately predicted compared with the common two-dimensional sectional view.
S2: and marking the well depth and the oil reservoir thickness of the first virtual well of each branch horizontal section and the well depth and the oil reservoir thickness of the second virtual well of each branch horizontal section on the three-dimensional profile to obtain the branch horizontal well prediction profile.
In one embodiment, in order to deploy the branched horizontal well in the target area, in a specific implementation, after determining the predicted section of the branched horizontal well, the branched horizontal well may be deployed in the target area according to the predicted section of the branched horizontal well. It should be noted that, in specific implementation, besides deploying the branch horizontal well by using the branch horizontal well prediction section, further research and analysis can be performed on the oil reservoir condition of the target area according to the branch horizontal well prediction section; and the predicted section of the branch horizontal well can be used as a reference basis, and other corresponding branch horizontal wells or other structures and the like are further designed in the target area. How to utilize the branch horizontal well prediction section obtained by the embodiment of the application, the application is not limited.
In the embodiment of the application, compared with the existing method, the well completion and three-dimensional seismic data are utilized to establish the virtual well and obtain the spatial information of the virtual well, the well depth and the oil layer thickness in the target area are fully considered, the connected graph of a plurality of branch horizontal sections is established, and then the three-dimensional branch horizontal well prediction section is established, so that the specific spatial information of the oil layer in the target area can be comprehensively and accurately represented through the three-dimensional branch horizontal well prediction section, the drilling encountering rate of the horizontal oil layer is improved, the technical problems of poor prediction precision and inaccurate data representation in the existing method are solved, and the technical effect of accurately guiding the deployment of the branch horizontal well is achieved.
Based on the same inventive concept, the embodiment of the invention also provides a device for determining the predicted section of the branch horizontal well, which is described in the following embodiment. The principle of solving the problems of the device for determining the predicted section of the branch horizontal well is similar to the method for determining the predicted section of the branch horizontal well, so the implementation of the device for determining the predicted section of the branch horizontal well can refer to the implementation of the method for determining the predicted section of the branch horizontal well, and repeated parts are not repeated. As used hereinafter, the term "unit" or "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated. Referring to the constitutional structural diagram of the determining apparatus of the branch horizontal well prediction section of fig. 2, the apparatus may specifically include: the acquiring module 201, the first establishing module 202, the second establishing module 203, and the determining module 204, which are described in detail below.
The acquisition module 201 may be specifically configured to acquire three-dimensional seismic data of a target area and borehole data of a plurality of completed wells in the target area.
The first establishing module 202 may be specifically configured to establish a plurality of virtual wells in each of the plurality of branch horizontal segments on both sides of the main horizontal segment according to the three-dimensional seismic data and the wellbore data of the plurality of completed wells, and obtain a well depth and a reservoir thickness of each of the plurality of virtual wells.
The second establishing module 203 may be specifically configured to establish a connectivity map of each of the plurality of branch horizontal segments according to the well depths and the reservoir thicknesses of the plurality of virtual wells.
The determining module 204 may be specifically configured to determine a branch horizontal well prediction profile according to the connectivity graph of the plurality of branch horizontal segments.
In an embodiment, in order to perform the deployment of the branch horizontal well by using the predicted profile of the branch horizontal well, the apparatus may further include: and the deployment module can be specifically used for deploying the branched horizontal well in the target area according to the predicted section of the branched horizontal well.
In one embodiment, in order to establish a virtual well and obtain spatial information (well depth and reservoir thickness) of the virtual well, the first establishing module 202 may specifically include:
a first determining unit, which may be specifically configured to determine a first pseudo well of the branch horizontal segment according to a connection line of two of the plurality of completed wells;
the second determining unit is specifically used for determining the well depth and the oil layer thickness of the first virtual well according to the well bore data of the completed well within the preset range of the first virtual well;
the third determining unit can be specifically used for determining the direction of the branch horizontal segment according to the well depth and the oil reservoir thickness of the first virtual well and the three-dimensional seismic data;
a fourth determining unit, which may be specifically configured to determine a second virtual well of the branch horizontal segment along the direction of the branch horizontal segment;
the fifth determining unit may be specifically configured to determine a well depth and a reservoir thickness of the second virtual well according to wellbore data of the completed well within a preset range of the second virtual well.
In an embodiment, in order to determine the position of the first virtual well, in an implementation, the first determining unit may specifically perform the following steps: taking the intersection point of the extension lines of the connecting lines of the two well completion wells on the same side of the main horizontal section and the main horizontal section as the position of the first virtual well of the branch horizontal section; and/or taking the intersection point of the connecting line of the two completed wells on different sides of the main horizontal section and the main horizontal section as the position of the first virtual well of the branch horizontal section.
In one embodiment, in order to obtain spatial information (well depth and reservoir thickness) of the first virtual well, the second determining unit may specifically perform the following steps: and determining the well depth and the oil layer thickness of the first virtual well through an interpolation algorithm according to the well bore data of the completed well within the preset range of the first virtual well.
In an embodiment, in order to determine a suitable direction as the direction of the branch horizontal segment, when implemented specifically, the third determining unit may specifically execute the following manner: and selecting the direction of the oil layer with the stability reaching a preset threshold value as the direction of the branch horizontal section according to the well depth and the oil layer thickness of the first virtual well and the three-dimensional seismic data.
In an embodiment, in order to establish a communication graph of a plurality of branch horizontal segments on two sides of the main horizontal segment, in a specific implementation, the second establishing module 203 may specifically include:
the first sub-unit may be specifically configured to determine an oil reservoir change condition of a region where the branch horizontal segment is located according to a well depth and an oil reservoir thickness of a first virtual well, a well depth and an oil reservoir thickness of a second virtual well of each branch horizontal segment of the plurality of branch horizontal segments;
the second subunit may be specifically configured to determine a connectivity map of the branch horizontal segment according to a change condition of an oil layer in a region where the branch horizontal segment is located.
In one embodiment, in order to make the obtained connectivity graph meet the requirement to improve the accuracy of the predicted profile of the finally obtained branch horizontal well, in particular, the apparatus may further include:
the detection unit may be specifically configured to determine whether connectivity of the connected graph of the branch horizontal segment meets a preset requirement;
the correction unit may be specifically configured to re-determine the direction of the branch horizontal segment when the connectivity graph of the branch horizontal segment does not meet the preset requirement.
In an embodiment, in order to establish a more reliable and accurate branch horizontal well prediction profile, in a specific implementation, the determining module 204 may specifically include:
the establishing unit is specifically used for establishing a three-dimensional section according to the connection diagram of the plurality of branch horizontal sections;
and the marking unit is specifically used for marking the well depth and the oil reservoir thickness of the first virtual well of each branch horizontal section, the well depth and the oil reservoir thickness of the second virtual well of each branch horizontal section on the three-dimensional profile map to obtain the branch horizontal well prediction profile.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
It should be noted that, the systems, devices, modules or units described in the above embodiments may be implemented by a computer chip or an entity, or implemented by a product with certain functions. For convenience of description, in the present specification, the above devices are described as being divided into various units by functions, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
Moreover, in the subject specification, adjectives such as first and second may only be used to distinguish one element or action from another element or action without necessarily requiring or implying any actual such relationship or order. References to an element or component or step (etc.) should not be construed as limited to only one of the element, component, or step, but rather to one or more of the element, component, or step, etc., where the context permits.
From the above description, it can be seen that the method and apparatus for determining a branch horizontal well prediction section provided by the embodiment of the present application establish a virtual well and obtain spatial information (well depth and oil layer thickness) of the virtual well by using completed well and three-dimensional seismic data, fully consider spatial information of an oil layer in a target area, establish a connection diagram of a plurality of branch horizontal segments to establish a three-dimensional branch horizontal well prediction section, so that specific spatial information of the oil layer in the target area can be more comprehensively and accurately represented by the three-dimensional branch horizontal well prediction section, so as to improve the drilling rate of a horizontal oil layer, solve the technical problems of poor prediction precision and inaccurate data representation in the existing method, and achieve the technical effects of accurately predicting a branch horizontal well and guiding deployment of the branch horizontal well; and the direction of the branch horizontal section is determined according to the thickness change condition of the oil layer in the target area, so that the technical effect of improving the accuracy of guiding the deployment of the branch horizontal well is achieved.
In a specific implementation scenario, the method and the device for determining the predicted section of the branch horizontal well provided by the application are used for determining the predicted section of the branch horizontal well in a certain block. The implementation can be performed in the following manner.
The data of a block is obtained, and the data may specifically include three-dimensional seismic data of the block, wellbore data of a plurality of completed wells in the block, and the like. Through the analysis of the data of the block, the buried depth of the oil reservoir in a certain block can be preliminarily determined to be 909-955 m, the average thickness of the oil reservoir in the certain block is 14.0m, and the oil reservoir is a lithologic structure oil reservoir. In addition, the inside of a certain block also comprises an oil well 11 and an open well 9. Specifically, due to the influence of deposition and reservoir, the production effect of vertical wells at different positions in the block is greatly different.
The preliminary condition is obtained according to the analysis, and in view of the fact that the production effect difference of the vertical wells on the east side and the west side of the deployment area is large, the thicknesses of oil layers encountered by the two drilling completion wells respectively positioned at the north end and the south end are not balanced, and in order to draw the geological reserves of the area to the maximum degree, the deployment design of the branched horizontal well is developed. By applying the method and the device for determining the predicted section of the branched horizontal well, the main horizontal section is designed to extend from the south where the oil layer is thick to the north where the oil layer is thin, wherein the length of the main horizontal section is 450.3 m. Four branches are designed on two sides of the main horizontal section. Specifically, the following steps (S1 to S4) may be performed. Namely, a B-type virtual well 10 is established, then a connected graph is established by using the virtual well, a completed well and seismic data, and finally a branch horizontal well prediction section is obtained.
S1: firstly, the structure of a virtual well and the development condition of an oil layer on a section line are predicted through a main horizontal segment oil reservoir section diagram.
S2: and then predicting the structure and oil layer development conditions of the rest virtual wells through the seismic section map of the horizontal section of each branch.
S3: finally, 2 completed wells are utilized, and a communication diagram is established by 10 virtual wells.
S4: and marking design parameters of the branch horizontal well.
It should be noted that the branch horizontal well prediction profile obtained by applying the scenario example can be smoothly deployed when the branch horizontal well is designed and deployed in the block. Specifically, the main trajectory (main horizontal segment) and each branch trajectory (branch horizontal segment) successfully enter the target; and during specific construction, the length of the actual drilling horizontal section is consistent with the design, the drilling encountering rate of an oil layer reaches 100%, the daily oil production of a peak value after production reaches 47.7t, and the average daily oil production is 2-3 times of that of a conventional horizontal well in the area, so that a better implementation effect is obtained.
In this scenario example, it should be further noted that during specific construction, in the deployment area of the branch horizontal well, an a-type virtual well is established between the drilling completion wells at two sides of the horizontal segment, between the drilling completion well extension lines at the same side of the horizontal segment and inside the horizontal segment or at the intersection of the extension lines, and the construction and oil layer development conditions of the a-type virtual well are predicted by using the completion wells; establishing a B-type virtual well by using the entry points and end points of the main horizontal segment and each branch horizontal segment, and predicting the structure and oil layer development condition of the B-type virtual well by using the completed well and the A-type virtual well by using the oil reservoir profile or the seismic profile passing through the main horizontal segment and each branch horizontal segment; and establishing a communicating graph by using the completed well and the B-type virtual well in the deployment area, and marking design parameters of the branch horizontal well.
Through the scene example, the technical problems of poor prediction precision and inaccurate data representation in the existing method can be really solved, and the technical effects of accurately predicting the position of the branch horizontal well and guiding the deployment of the branch horizontal well are achieved.
Although the application refers to a method or a device for determining a predicted section of a different branch horizontal well, the application is not limited to the situation described in the industry standard or the embodiment, and the like, and the implementation effect that certain industry standard or the implementation scheme slightly modified based on the implementation scheme described in the custom manner or the embodiment can also achieve the same, equivalent or similar implementation effect or the expected implementation effect after modification of the above embodiment. Embodiments employing such modified or transformed data acquisition, processing, output, determination, etc., may still fall within the scope of alternative embodiments of the present application.
Although the present application provides method steps as described in an embodiment or flowchart, more or fewer steps may be included based on conventional or non-inventive means. The order of steps recited in the embodiments is merely one manner of performing the steps in a multitude of orders and does not represent the only order of execution. When an apparatus or client product in practice executes, it may execute sequentially or in parallel (e.g., in a parallel processor or multithreaded processing environment, or even in a distributed data processing environment) according to the embodiments or methods shown in the figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, the presence of additional identical or equivalent elements in a process, method, article, or apparatus that comprises the recited elements is not excluded.
The devices or modules and the like explained in the above embodiments may be specifically implemented by a computer chip or an entity, or implemented by a product with certain functions. For convenience of description, the above devices are described as being divided into various modules by functions, and are described separately. Of course, in implementing the present application, the functions of each module may be implemented in one or more pieces of software and/or hardware, or a module that implements the same function may be implemented by a combination of a plurality of sub-modules, and the like. The above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and other divisions may be realized in practice, for example, a plurality of modules or components may be combined or integrated into another system, or some features may be omitted, or not executed.
Those skilled in the art will also appreciate that, in addition to implementing the controller as pure computer readable program code, the same functionality can be implemented by logically programming method steps such that the controller is in the form of logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers and the like. Such a controller may therefore be considered as a hardware component, and the means included therein for performing the various functions may also be considered as a structure within the hardware component. Or even means for performing the functions may be regarded as being both a software module for performing the method and a structure within a hardware component.
The application may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, classes, etc. that perform particular tasks or implement particular abstract data types. The application may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, or the like, and includes several instructions for enabling a computer device (which may be a personal computer, a mobile terminal, a server, or a network device) to execute the method according to the embodiments or some parts of the embodiments of the present application.
The embodiments in the present specification are described in a progressive manner, and the same or similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. The application is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable electronic devices, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
While the present application has been described with examples, those of ordinary skill in the art will appreciate that there are numerous variations and permutations of the present application without departing from the spirit of the application, and it is intended that the appended claims encompass such variations and permutations without departing from the present application.
Claims (11)
1. A method for determining a predicted section of a branch horizontal well is characterized by comprising the following steps:
acquiring three-dimensional seismic data of a target area and borehole data of a plurality of completed wells in the target area;
establishing a plurality of virtual wells in each branch horizontal section of a plurality of branch horizontal sections at two sides of the main horizontal section according to the three-dimensional seismic data and the well bore data of the plurality of completed wells, and acquiring the well depth and the oil layer thickness of each virtual well of the plurality of virtual wells;
establishing a communicating graph of each branch horizontal section in the plurality of branch horizontal sections according to the well depths and the oil reservoir thicknesses of the plurality of virtual wells;
determining a branch horizontal well prediction section according to the connectivity graph of the plurality of branch horizontal sections; the branch horizontal well prediction section is a three-dimensional branch horizontal well prediction section and is used for representing specific spatial information of an oil layer;
wherein, according to the well depth and the reservoir thickness of a plurality of virtual wells, establish the connectivity map of a plurality of branch horizontal segments in the both sides of main horizontal segment, include: determining the oil layer change condition of the region of each branch horizontal section according to the well depth and the oil layer thickness of the first virtual well and the well depth and the oil layer thickness of the second virtual well of each branch horizontal section in the plurality of branch horizontal sections; determining a communicating graph of the branch horizontal section according to the change condition of the oil layer of the region where the branch horizontal section is located;
wherein after determining the connectivity graph for the branch horizontal segment, the method further comprises: and determining whether the connectivity of the communication diagram of the branch horizontal section meets the preset requirement by detecting whether the variation of each virtual well, the well depth of the completed well and the thickness of the oil layer in the communication diagram in the flow diagram of the branch horizontal section is within a limit range.
2. The method of claim 1, wherein after determining the branch horizontal well predicted profile, the method further comprises:
and deploying the branched horizontal well in the target area according to the predicted section of the branched horizontal well.
3. The method of claim 1, wherein establishing a plurality of virtual wells in each of a plurality of branch levels on either side of a main level based on the three-dimensional seismic data and wellbore data for the plurality of completed wells, and obtaining a well depth and a reservoir thickness for each of the plurality of virtual wells comprises: respectively establishing a plurality of virtual wells in the plurality of branch horizontal sections, and acquiring the well depth and the reservoir thickness of each virtual well in the plurality of virtual wells:
determining a first pseudo well for the branch horizontal segment based on a connection of two of the plurality of completed wells;
determining the well depth and the oil layer thickness of a first virtual well according to the well hole data of the completed well within a preset range of the first virtual well;
determining the direction of the branch horizontal section according to the well depth and the oil reservoir thickness of the first virtual well and the three-dimensional seismic data;
determining a second virtual well of the branch horizontal segment along the direction of the branch horizontal segment;
and determining the well depth and the reservoir thickness of the second virtual well according to the well hole data of the completed well within the preset range of the second virtual well.
4. The method of claim 3, wherein determining a first pseudo well for a branch horizontal segment based on a line connecting two of the plurality of completed wells comprises:
taking the intersection point of the extension lines of the connecting lines of the two well completion wells on the same side of the main horizontal section and the main horizontal section as the position of the first virtual well of the branch horizontal section;
and/or the presence of a gas in the gas,
and taking the intersection point of the connecting line of the two well completion wells on different sides of the main horizontal section and the main horizontal section as the position of the first virtual well of the branch horizontal section.
5. The method of claim 3, wherein determining the well depth and the reservoir thickness of the first pseudo well from the wellbore data of the completed well within a preset range of the first pseudo well comprises:
and determining the well depth and the oil layer thickness of the first virtual well through an interpolation algorithm according to the well bore data of the completed well within the preset range of the first virtual well.
6. The method of claim 3, wherein determining the orientation of the branch horizontal segment from the three-dimensional seismic data, the reservoir thickness and the well depth of the first virtual well comprises:
and selecting the direction of the oil layer with the stability reaching a preset threshold value as the direction of the branch horizontal section according to the well depth and the oil layer thickness of the first virtual well and the three-dimensional seismic data.
7. The method of claim 1, wherein after determining the connectivity map for the branch level segment based on reservoir variations in the region in which the branch level segment is located, the method further comprises:
determining whether the connectivity of the connected graph of the branch horizontal segment meets a preset requirement;
if the preset requirement is not met, the direction of the branch horizontal segment is redetermined.
8. The method of claim 3, wherein determining a branch horizontal well predicted profile from the connectivity graph of the plurality of branch horizontal segments comprises:
establishing a three-dimensional section according to the communication graph of the plurality of branch horizontal sections;
and marking the well depth and the oil reservoir thickness of the first virtual well of each branch horizontal section and the well depth and the oil reservoir thickness of the second virtual well of each branch horizontal section on the three-dimensional profile to obtain the branch horizontal well prediction profile.
9. A device for determining a predicted profile of a branch horizontal well is characterized by comprising:
the acquisition module is used for acquiring three-dimensional seismic data of a target area and borehole data of a plurality of completed wells in the target area;
a first establishing module, configured to establish a plurality of virtual wells in each of the plurality of branch horizontal segments on both sides of the main horizontal segment according to the three-dimensional seismic data and the wellbore data of the plurality of completed wells, and obtain a well depth and an oil layer thickness of each of the plurality of virtual wells;
the second establishing module is used for establishing a communicating graph of each branch horizontal section in the plurality of branch horizontal sections according to the well depths and the oil reservoir thicknesses of the plurality of virtual wells;
the determining module is used for determining the prediction section of the branch horizontal well according to the connected graph of the plurality of branch horizontal sections; the branch horizontal well prediction section is a three-dimensional branch horizontal well prediction section and is used for representing specific spatial information of an oil layer;
the second establishing module is specifically configured to determine an oil layer change condition of a region where the branch horizontal segment is located according to the well depth and the oil layer thickness of the first virtual well, the well depth and the oil layer thickness of the second virtual well of each branch horizontal segment of the plurality of branch horizontal segments; determining a communicating graph of the branch horizontal section according to the change condition of the oil layer of the region where the branch horizontal section is located;
after determining the connectivity graph of the branch horizontal segment, the device further determines whether the connectivity of the connectivity graph of the branch horizontal segment meets the preset requirement by detecting whether the variation of each virtual well, the well depth of the completed well and the thickness of the oil layer in the connectivity graph in the flow graph of the branch horizontal segment is within a limit range.
10. The apparatus of claim 9, further comprising:
and the deployment module is used for deploying the branched horizontal well in the target area according to the predicted section of the branched horizontal well.
11. The apparatus of claim 9, wherein the first establishing means comprises:
a first determination unit for determining a first pseudo well of the branch horizontal section according to a connection line of two of the plurality of completed wells;
the second determining unit is used for determining the well depth and the oil layer thickness of the first virtual well according to the well bore data of the completed well in the preset range of the first virtual well;
the third determining unit is used for determining the direction of the branch horizontal section according to the well depth and the oil reservoir thickness of the first virtual well and the three-dimensional seismic data;
a fourth determination unit for determining a second virtual well of the branch horizontal segment along the direction of the branch horizontal segment;
and the fifth determining unit is used for determining the well depth and the reservoir thickness of the second virtual well according to the well bore data of the completed well within the preset range of the second virtual well.
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