Stratum profile construction method and device, storage medium and computer program

Abstract

The invention relates to a formation section construction method and device, a storage medium and a computer program, and the method comprises the steps that layer position points on tracks of a plurality of reference wells in a preset range of a horizontal well are obtained, and the layer position points on the tracks of the reference wells come from corresponding layers on a formation section of the reference wells and are used for representing the positions of the layers. And traversing each test point, and calculating a distance coefficient between the current test point and the different reference wells. Based on a preset distance coefficient calculation formula, according to the distance between each horizon point on the same reference well and the test point, the distance coefficient between the test point and the reference well is calculated, and the distance coefficients between the same test point and different reference wells are compared; the reference well with the minimum distance coefficient is selected as the interpretation well to which the test point belongs, different interpretation wells have different stratigraphic sections, and the thickness of the same layer in the stratigraphic sections of the different interpretation wells is different.

Description

Technical Field

[0001] This disclosure relates to the field of oil and gas drilling technology, and in particular to a method, apparatus, storage medium and computer program for constructing a formation profile. Background Technology

[0002] Geological steering technology provides crucial support for precise trajectory control in horizontal well drilling and is one of the key technologies for developing unconventional and complex oil and gas reservoirs. With the development of horizontal well technology and the increasing demand for production from single horizontal wells, the accuracy of steering tracking needs to be improved to ensure drilling success rates.

[0003] However, existing directional tracking methods typically construct directional formation profile models using the equal thickness method, and use the same formation profile for layer interpretation at different locations in horizontal wells. This results in significant differences from the actual formation thickness, leading to errors in formation dip angle calculations and affecting horizontal well drilling decisions. Summary of the Invention

[0004] This disclosure provides a method, apparatus, storage medium, and computer program for constructing a formation profile to avoid interpreting the entire horizontal well using the same formation profile.

[0005] In a first aspect, this disclosure provides a method for constructing a stratigraphic profile, comprising:

[0006] Obtain several test points on the trajectory of the horizontal well;

[0007] The layer positions on the trajectory of several reference wells within a preset range of the horizontal well are obtained, wherein different layer positions correspond to different layers on the formation profile of the reference wells;

[0008] For each test point, based on a preset distance coefficient calculation formula, the distance between each reference well and each test point is calculated according to the distance between each layer point on the same reference well and the test point, to obtain the distance coefficient of each reference well to each test point; wherein, in the preset distance coefficient calculation formula, the distance between the test point and the layer point and the distance coefficient are positively correlated;

[0009] For each test point, the reference well with the smallest distance coefficient is selected as the interpretation well to which the test point belongs;

[0010] Using the formation profile of the interpretation well to which the test point belongs, the trajectory segment of the horizontal well where the test point is located is interpreted by stratigraphic analysis, and the formation profile of the trajectory segment of the horizontal well where each test point is located is obtained.

[0011] In some embodiments, the step of interpreting the trajectory segments of the horizontal wells where the test points are located using the formation profile of the interpretation well to which the test points belong, and obtaining the formation profiles of the trajectory segments of the horizontal wells where each test point is located, includes:

[0012] When several consecutive test points belong to the same reference well, the stratigraphic profiles of the consecutive test points are used to perform stratigraphic interpretation on the trajectory segments of the horizontal wells where the test points are located, and the stratigraphic profiles of the trajectory segments of the horizontal wells where each test point is located are obtained respectively. The trajectory segments are the trajectories of several consecutive test points where the interpretation wells are the same reference wells.

[0013] In some embodiments, the step of interpreting the trajectory segments of the horizontal well where the test point is located using the formation profile of the interpretation well to which the test point belongs, and obtaining the formation profile of the trajectory segments of the horizontal well where each test point is located, includes:

[0014] When several consecutive test points belong to the same reference well, the trajectory of the horizontal wells where the several consecutive test points belong to the same reference well is divided into first-level interpretation segments to obtain each first-level interpretation segment.

[0015] Trajectory points are selected from the same first-level interpretation segment as second-level interpretation points;

[0016] The logging data of the secondary interpretation point and the logging data of the interpretation well are compared for similarity, and matching points similar to the secondary interpretation point are determined in the formation profile of the interpretation well;

[0017] When interpreting the secondary interpretation point using the formation profile of the interpretation well, the relative position of the formation profile of the interpretation well and the secondary interpretation point is determined according to the relative position of the matching point in the formation profile of the interpretation well, thereby obtaining the formation profile of the trajectory segment of the horizontal well where the secondary interpretation point is located.

[0018] In some embodiments, the step of calculating the distance coefficient between each reference well and each test point based on a preset distance coefficient calculation formula, according to the distance between each layer point on the same reference well and the test point, to obtain the distance coefficient of each reference well to each test point, includes:

[0019] The location data of each of the aforementioned layer sites in several of the aforementioned reference wells are obtained respectively;

[0020] The distance between each layer point on each reference well and the test point is calculated based on the location data of each layer point on each reference well and the location data of the test point.

[0021] For each reference well, a weighted calculation is performed based on the preset distance coefficient calculation formula, taking into account the distance between each layer point and the test point on the same reference well and the weight of each layer point, to obtain the distance coefficient between each reference well and the test point.

[0022] In some embodiments, the layer point includes a point of the target layer and a point of the adjacent layer, the target layer and the adjacent layer being distributed consecutively along the elevation direction, and the weight of the point of the target layer being greater than the weight of the point of the adjacent layer.

[0023] In some embodiments, the weights of the points in the adjacent layers are calculated based on a preset weighting formula using the absolute values ​​of the elevation differences between all the points in the adjacent layers and the points in the target layer; wherein, the weights of the points in the adjacent layers are inversely correlated with the absolute values ​​of the elevation differences between the points in the adjacent layers and the points in the target layer.

[0024] In some embodiments, the weight of the nth neighboring layer is calculated as follows:

[0025]

[0026] Where Qn represents the weight of the nth neighboring layer point, k represents the layer division coefficient, the value of k is greater than 0 and less than 1, N represents the total number of neighboring layer points, and z n -z g z represents the elevation difference between the nth neighboring layer point and the target layer point. a -z g This represents the elevation difference between the a-th neighboring layer point and the target layer point;

[0027] The formula for calculating the weight of the point at the target layer is as follows:

[0028] Q g =1-k

[0029] Where Qg represents the weight of the point at the target layer.

[0030] In a second aspect, this disclosure provides a computer device including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the foregoing aspect.

[0031] Thirdly, this disclosure provides a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the steps of the method described above.

[0032] Fourthly, this disclosure provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the methods described in the foregoing aspects.

[0033] This disclosure provides a method, apparatus, storage medium, and computer program for constructing a formation profile. The method involves acquiring several test points on the trajectory of a horizontal well and obtaining stratigraphic points on the trajectories of several reference wells within a preset range of the horizontal well. The stratigraphic points on the reference well trajectories are derived from the corresponding stratigraphic positions on the formation profile of the reference wells and are used to indicate the location of their respective stratigraphic positions. Each test point is traversed, and the distance coefficient between the current test point and different reference wells is calculated. The distance coefficient measures the distance between a test point and a reference well. Specifically, based on a preset distance coefficient calculation formula, the distance coefficient between the test point and the reference well is calculated according to the distances between each stratigraphic point on the same reference well and the test point. After all test points have been traversed, the distance coefficients between each test point and different reference wells are obtained. The distance coefficients between the same test point and different reference wells are compared, and the reference well with the smallest distance coefficient is selected as the interpretation well to which the test point belongs. After comparing the distance coefficients of each test point, the interpretation well to which each test point belongs can be determined. Different interpretation wells produce different formation profiles, and the thickness of the same stratum varies across these profiles. By utilizing the formation profile of the interpretation well to which a test point belongs, the trajectory segments of the corresponding horizontal well are segmented for stratum interpretation. This allows for the selection of the formation profile of the interpretation well with the lowest stratigraphic distance from the test points within each segment. This yields the formation profiles for each trajectory segment of the horizontal well to each test point, avoiding the use of the same formation profile for the entire horizontal well. This reduces discrepancies with actual formation thickness, minimizing errors in subsequent formation dip angle calculations and facilitating drilling decisions for horizontal wells. Attached Figure Description

[0034] The present disclosure will be described in more detail below based on embodiments and with reference to the accompanying drawings:

[0035] Figure 1 A schematic flowchart illustrating a method for constructing a stratigraphic profile provided in an embodiment of this disclosure;

[0036] Figure 2 A diagram illustrating the effect of calculating the distance coefficient between the reference well and the horizontal well measurement points, provided in this embodiment of the disclosure.

[0037] Figure 3The diagram shows the effect of the three first-level explanation sections provided in the embodiments of this disclosure;

[0038] Figure 4 This is an illustration of the effect of explaining the second-level layer in the embodiments of this disclosure.

[0039] In the accompanying drawings, the same parts are referred to by the same reference numerals, and the drawings are not drawn to scale. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of this disclosure, and to fully understand and implement the process of how this disclosure applies technical means to solve technical problems and achieve corresponding technical effects, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, not all embodiments. The embodiments of this disclosure and the various features within them can be combined with each other without conflict, and the resulting technical solutions are all within the protection scope of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort should fall within the protection scope of this disclosure.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0043] Geological steering technology provides crucial support for precise trajectory control in horizontal well drilling and is one of the key technologies for developing unconventional and complex oil and gas reservoirs. With the development of horizontal well technology and the increasing demand for single-horizontal-well production, the accuracy of steering tracking needs to be improved to ensure drilling success rates. However, existing steering tracking methods typically construct steering formation profile models using the equal-thickness method, which significantly differs from the actual formation thickness, leading to errors in formation dip calculations and affecting horizontal well drilling decisions. Therefore, there is an urgent need to provide an effective method for constructing steering formation profile models using a non-equal-thickness method.

[0044] Example 1

[0045] Figure 1 This is a schematic flowchart illustrating a method for constructing a formation profile for a horizontal well, as provided in an embodiment of this disclosure. Figure 1 As shown, a method for constructing a formation profile for a horizontal well includes:

[0046] Step 110: Obtain several test points on the trajectory of the horizontal well.

[0047] In this embodiment, the trajectory of a horizontal well can be calculated based on the well's orientation data. The trajectory of a horizontal well is formed by multiple trajectory points. Several trajectory points are selected as test points from the trajectory of the horizontal well. The orientation data includes the well inclination data and azimuth data of all measurement points from the wellhead to the drill bit. The orientation data is used to calculate and determine the coordinate information of the horizontal well's trajectory, and to determine the position data of each trajectory point on the trajectory. When the test points on the trajectory are determined, the position data of the test points can be determined.

[0048] Step 120: Obtain the stratigraphic positions on the trajectories of several reference wells within a preset range of the horizontal well, wherein different stratigraphic positions correspond to different stratigraphic positions on the formation profile of the reference wells.

[0049] In this embodiment, a reference well is located around the horizontal well. When the distance between the reference well and the horizontal well is close, the formation profiles of the horizontal well and the reference well are relatively similar. The preset range is a geographical area centered on the wellhead of the horizontal well and within a preset distance from that center. The preset distance is used to determine the maximum distance between the wellheads of the reference well and the horizontal well. Wells with a distance less than or equal to the preset distance from the horizontal well are selected as reference wells. Reference wells include real wells and / or virtual wells, where virtual wells are virtual wells generated based on a geological model within the preset range of the horizontal well. Reference wells include vertical wells and / or deviated wells.

[0050] In this embodiment, the trajectory of the reference well can be calculated based on the well's orientation data. The trajectory is formed by multiple trajectory points of the reference well. The trajectory passes through different strata on the stratigraphic profile of the geological region where the reference well is located, and these strata have different elevations. Trajectory points are selected from the reference well's trajectory as stratum points. For each stratum, trajectory points are selected from the trajectories of reference wells that have passed through that stratum. These stratum points can be selected from the trajectories of reference wells passing through the top / bottom of the stratum, or from the trajectories of reference wells passing through the midpoint of the stratum. The stratum points are used to indicate the location of the corresponding stratum on the reference well's trajectory.

[0051] Step 130: For each test point, based on a preset distance coefficient calculation formula, calculate the distance between each reference well and each test point according to the distance between each layer point on the same reference well and the test point, and obtain the distance coefficient of each reference well to each test point; wherein, the distance between the test point and the layer point in the preset distance coefficient calculation formula is positively correlated with the distance coefficient.

[0052] In this embodiment, the relative positions of different test points on the horizontal well and each reference well are different, and the distance between the test points and each reference well is different. The distance is the geographical distance between the test point and the reference well. When calculating the distance between a test point and a reference well, the distance between each layer point on the reference well and the test point is first calculated. This distance is used to measure the distance between the test point and the layer to which each layer point belongs. The larger the distance between the layer point and the test point, the greater the distance between the layer to which the layer point belongs and the test point. Then, using a preset distance coefficient calculation formula, the distance between the test point and each layer on the reference well is comprehensively considered, and the distance coefficient is calculated based on the distance between the test point and each layer point on the reference well. The distance between the test point and the layer point and the distance coefficient are positively correlated; the larger the distance between the test point and the layer point, the larger the distance coefficient. The distance coefficient is used to measure the geographical distance between the reference well and the test point, taking into account the distance between each layer of the reference well and the test point.

[0053] In this embodiment, different test points are traversed, and the distance between each test point and each reference well is calculated to obtain the distance coefficient between each test point and each reference well.

[0054] In one embodiment, the step of calculating the distance coefficient between each reference well and each test point based on a preset distance coefficient calculation formula, according to the distance between each layer point on the same reference well and the test point, to obtain the distance coefficient of each reference well to each test point, includes:

[0055] The location data of each of the aforementioned layer sites in several of the aforementioned reference wells are obtained respectively;

[0056] The distance between each layer point on each reference well and the test point is calculated based on the location data of each layer point on each reference well and the location data of the test point.

[0057] For each reference well, a weighted calculation is performed based on the preset distance coefficient calculation formula, taking into account the distance between each layer point and the test point on the same reference well and the weight of each layer point, to obtain the distance coefficient between each reference well and the test point.

[0058] In this embodiment, the location data of the stratigraphic position is the three-dimensional coordinate data of the stratigraphic position. Different reference wells may have several stratigraphic positions of the same type in their stratigraphic profiles. However, the thickness and elevation of stratigraphic positions of the same type differ in different reference well stratigraphic profiles. Therefore, the location data of the stratigraphic position of the same type of stratigraphic position are different in different reference wells. For the current test point, the location data of the test point is acquired. This process is repeated for each reference well. Based on the location data of each stratigraphic position in each reference well and the location data of the test point, the distance between each stratigraphic position in each reference well and the current test point is calculated. Each stratigraphic position has a weight, which is determined according to the importance of the stratigraphic position to which the position belongs. The importance of the stratigraphic position is determined according to the stratigraphic region to be studied. The distance between the stratigraphic position and the stratigraphic region to be studied is inversely correlated with the weight; the smaller the distance between the stratigraphic position and the stratigraphic region to be studied, the greater the weight. Between a reference well and a test point, based on a preset distance coefficient calculation formula, the distances between each layer site on the reference well and the test point, as well as the weight of each layer site, are weighted and calculated to obtain the distance coefficient between the reference well and the test point. That is, for each layer, the distance between the layer site and the test point is multiplied by the weight of the layer site to obtain the product result of each layer site, and then the product results of each layer site are summed to obtain the distance coefficient.

[0059] In one embodiment, the layer point includes a point of the target layer and points of the adjacent layers, the target layer and the adjacent layers being distributed consecutively along the elevation direction, and the weight of the point of the target layer is greater than the weight of the point of the adjacent layer.

[0060] In this embodiment, the target layer point is the layer point of the target layer of interest during drilling, which guides the drilling process. The adjacent layer point is the layer point of the layer closest to the target layer. There are several adjacent layers, some of which may be located on the side with an elevation higher than the target layer (i.e., the adjacent layers are higher than the target layer), and some of which may be located on the side with an elevation lower than the target layer (i.e., the adjacent layers are lower than the target layer). One adjacent layer may be adjacent to the target layer or to another adjacent layer close to the target layer. The target layer is located in the stratigraphic region to be studied and is of greater importance, while the adjacent layers are farther away and of less importance. Therefore, the weight of the target layer point is set greater than that of the adjacent layer points to highlight the influence of the distance between the target layer and the test point on the distance coefficient.

[0061] In one embodiment, the weight of the points in the adjacent layers is calculated based on a preset weighting formula using the absolute value of the elevation difference between each point in the adjacent layers and the point in the target layer; wherein, the weight of the points in the adjacent layers is inversely correlated with the absolute value of the elevation difference between each point in the adjacent layers and the point in the target layer.

[0062] In this embodiment, the absolute value of the elevation difference between a point in a neighboring stratum and a point in the target stratum reflects the distance between the neighboring and target strata, as well as the distance between the neighboring stratum and the stratigraphic region to be studied. The smaller the absolute value of the elevation difference between a point in a neighboring stratum and a point in the target stratum, the closer the neighboring stratum is to the target stratum, and the greater its importance. In the weight calculation formula for the points in neighboring strata, the absolute values ​​of the elevation differences between all points in neighboring strata and the target stratum are considered, and the importance of the absolute value of the elevation difference between the current point in a neighboring stratum and the target stratum is also considered. The smaller the absolute value of the elevation difference between the current point in a neighboring stratum and the target stratum, the greater the weight of the current point in a neighboring stratum, resulting in an inverse correlation between the weight of the points in a neighboring stratum and the absolute value of the elevation difference between the points in a neighboring stratum and the target stratum.

[0063] In one embodiment, the weight of the nth neighboring layer point is calculated as follows:

[0064]

[0065] Where Qn represents the weight of the nth neighboring layer point, k represents the layer division coefficient, the value of k is greater than 0 and less than 1, N represents the total number of neighboring layer points, and z n -z g z represents the elevation difference between the nth neighboring layer point and the target layer point. a -zg This represents the elevation difference between the a-th neighboring layer point and the target layer point;

[0066] The formula for calculating the weight of the point at the target layer is as follows:

[0067] Q g =1-k

[0068] Where Qg represents the weight of the point at the target layer.

[0069] In this embodiment, the stratigraphic division coefficient is used to determine the proportion of importance between the target stratigraphic level and all adjacent stratigraphic levels. The division of importance between the target stratigraphic level and adjacent stratigraphic levels in the calculation of each distance coefficient can be flexibly adjusted. For example, when the stratigraphic division coefficient is 1 / 2, the weight Qg of the point at the target stratigraphic level is 1 / 2, indicating that the distance between the target stratigraphic level and the test point has a importance of 1 / 2 in the distance coefficient calculation; the sum of the weights of all adjacent stratigraphic levels is 1 / 2, indicating that the distance between all adjacent stratigraphic levels and the test point has a importance of 1 / 2 in the distance coefficient calculation. The reciprocal of the absolute value of the elevation difference between the adjacent stratigraphic level and the target stratigraphic level is calculated as the importance coefficient. The proportion of the importance coefficient of the current adjacent stratigraphic level in the sum of the importance coefficients of all adjacent stratigraphic levels is calculated to obtain the weight of the current adjacent stratigraphic level.

[0070] Step 140: For each test point, select the reference well with the smallest distance coefficient as the interpretation well to which the test point belongs.

[0071] In this embodiment, for each test point, a distance coefficient is assigned between the test point and different reference wells. This distance coefficient measures the geographical distance between the test point and each reference well. The smaller the distance coefficient, the smaller the distance between the test point and the reference well, and the more similar the stratigraphic profiles are likely to be. Therefore, the stratigraphic profile at the test point can be interpreted using the stratigraphic profile of the reference well. Thus, for each test point, the distance coefficients between different reference wells and the test point are compared, and the reference well with the smallest distance coefficient is selected as the interpretation well to which the test point belongs, determining the reference well that can be used to interpret the stratigraphic profile of the test point.

[0072] Step 150: Using the formation profile of the interpretation well to which the test point belongs, perform stratigraphic interpretation on the trajectory segment of the horizontal well where the test point is located, and obtain the formation profile of the trajectory segment of the horizontal well where each test point is located.

[0073] In this embodiment, the interpretation well is a well whose formation profile in the area is known. Using the formation profile of the interpretation well, stratigraphic interpretation is performed on the location of the test point, ensuring that the formation profile of the trajectory segment of the horizontal well to which the test point is located is the same as that of the interpretation well. When the test point belongs to different interpretation wells, different formation profiles are used for interpretation. The thickness of the same stratigraphic segment differs in different formation profiles. Therefore, this avoids using the same formation profile to interpret the stratigraphic segments of the horizontal well in a general way, and prevents the stratigraphic thickness of each trajectory segment from being the same. It ensures that the stratigraphic distribution of each trajectory segment is the same as the stratigraphic distribution of the corresponding interpretation well, reducing discrepancies with the actual formation thickness. This helps to reduce errors in subsequent formation dip angle calculations and is beneficial for horizontal well drilling decisions.

[0074] In one embodiment, the step of using the formation profile of the interpretation well to which the test point belongs to perform stratigraphic interpretation on the trajectory segment of the horizontal well where the test point is located, and obtaining the formation profile of the trajectory segment of the horizontal well where each test point is located, includes:

[0075] When several consecutive test points belong to the same reference well, the stratigraphic profiles of the consecutive test points are used to perform stratigraphic interpretation on the trajectory segments of the horizontal wells where the test points are located, and the stratigraphic profiles of the trajectory segments of the horizontal wells where each test point is located are obtained respectively. The trajectory segments are the trajectories of several consecutive test points where the interpretation wells are the same reference wells.

[0076] In this embodiment, when several consecutive test points belong to the same interpretation well, it means that the same reference well can be used to interpret the stratigraphy of the several consecutive test points. The formation profile of the trajectory points on the trajectory segment of the horizontal well where the test points are located is usually the same as the formation profile of the interpretation well to which the test points belong. Therefore, when several consecutive test points belong to the same interpretation well, the trajectory of the horizontal wells to which the several consecutive test points belong to the same reference well is taken as a trajectory segment, and this trajectory segment is interpreted using the formation profile of the interpretation well to which the test points belong.

[0077] In one embodiment, the step of using the formation profile of the interpretation well to which the test point belongs to perform stratigraphic interpretation on the trajectory segment of the horizontal well where the test point is located, and obtaining the formation profile of the trajectory segment of the horizontal well where each test point is located, includes:

[0078] When several consecutive test points belong to the same reference well, the trajectory of the horizontal wells where the several consecutive test points belong to the same reference well is divided into first-level interpretation segments to obtain each first-level interpretation segment.

[0079] Trajectory points are selected from the same first-level interpretation segment as second-level interpretation points;

[0080] The logging data of the secondary interpretation point and the logging data of the interpretation well are compared for similarity, and matching points similar to the secondary interpretation point are determined in the formation profile of the interpretation well;

[0081] When interpreting the secondary interpretation point using the formation profile of the interpretation well, the relative position of the formation profile of the interpretation well and the secondary interpretation point is determined according to the relative position of the matching point in the formation profile of the interpretation well, thereby obtaining the formation profile of the trajectory segment of the horizontal well where the secondary interpretation point is located.

[0082] In this embodiment, when several consecutive test points belong to the same reference well, the trajectory segments of the horizontal well where the test points are located can all be interpreted using the formation profiles of the interpretation wells, dividing the trajectory of the horizontal well where the test points are located into first-order interpretation segments. When adjacent test points belong to different reference wells, the adjacent test points are divided into different first-order interpretation segments. Since two adjacent first-order interpretation segments utilize different interpretation wells, different formation profiles are used to interpret the strata of the two adjacent first-order interpretation segments, avoiding the indiscriminate use of the same formation profile to interpret the entire trajectory of the horizontal well. After determining the formation profiles required for the first-level interpretation section, to determine the longitudinal position of the formation profiles at different trajectory points within the first-level interpretation section, trajectory points within the first-level interpretation section are selected as second-level interpretation points. The logging data of the second-level interpretation points is compared with the logging data of each trajectory point in the interpretation well. The logging data includes, for example, natural gamma ray and / or resistivity. The trajectory point from the interpretation well that is most similar to the logging data of the second-level interpretation point is selected as the matching point. Based on the relative position of the matching point in the formation profile of the interpretation well, the relative position of the second-level interpretation point and the formation profile is determined in the stratigraphic interpretation, ensuring that the relative position of the second-level interpretation point in the formation profile is the same as the relative position of the matching point in the formation profile of the interpretation well. This determines the position of the formation profile in the elevation direction of the second-level interpretation point. Each second-level interpretation point has a second-level interpretation line in its elevation direction. The stratigraphic boundary points on the second-level interpretation line are determined based on the division of each stratigraphic layer in the formation profile of the interpretation well. The stratigraphic boundary points are the boundaries between two adjacent stratigraphic layers, and the stratigraphic boundaries between two adjacent stratigraphic boundaries belong to the same stratigraphic layer. Connecting the corresponding stratigraphic boundaries on adjacent secondary interpretation lines creates a secondary interpretation segment between two secondary interpretation lines, which displays the stratigraphic profile between two adjacent secondary interpretation lines.

[0083] In this embodiment, the method for constructing a formation profile involves acquiring several test points on the trajectory of a horizontal well and acquiring stratigraphic points on the trajectories of several reference wells within a preset range of the horizontal well. The stratigraphic points on the reference well trajectories are derived from the corresponding stratigraphic positions on the formation profile of the reference wells and are used to indicate the location of their respective stratigraphic positions. Each test point is traversed, and the distance coefficient between the current test point and different reference wells is calculated. The distance coefficient is used to measure the distance between a test point and a reference well. Specifically, based on a preset distance coefficient calculation formula, the distance coefficient between the test point and the reference well is calculated according to the distances between each stratigraphic point on the same reference well and the test point. After all test points have been traversed, the distance coefficient between each test point and different reference wells is obtained. The distance coefficients between the same test point and different reference wells are compared, and the reference well with the smallest distance coefficient is selected as the interpretation well to which the test point belongs. After comparing the distance coefficients of each test point, the interpretation well to which each test point belongs can be determined. Different interpretation wells have different formation profiles, and the thickness of the same stratigraphic position varies in the formation profiles of different interpretation wells. By utilizing the formation profile of the interpretation well to which the test point belongs, stratigraphic interpretation is performed on the trajectory segments of the horizontal well where the corresponding test point is located. This allows for the selection of the formation profile of the interpretation well with the smallest distance between test points in the trajectory segment for stratigraphic interpretation, thus obtaining the formation profile of the trajectory segment of the horizontal well where each test point is located. This avoids interpreting the entire horizontal well using the same formation profile indiscriminately, reducing the difference from the actual formation thickness. This helps to reduce errors in subsequent formation dip angle calculations and is beneficial for horizontal well drilling decisions.

[0084] Example 2

[0085] Based on the above embodiments, a method for constructing a formation profile of a horizontal well includes:

[0086] Step 1: Import horizontal well directional data and logging data, including the directional data, logging data, and stratigraphic data from the reference wells around the horizontal well. The directional data includes the wellbore inclination (Devi) and azimuth (Azim) of all measurement points from the wellhead to the drill bit, used to calculate and determine the horizontal well trajectory coordinates. The reference wells around the horizontal well include, but are not limited to, actual drilled wells and virtual wells generated based on the wellbore geological model, denoted as cWelli (i = 1, 2, 3, ..., N). The stratigraphic data includes the boundary depth (MD) and the stratigraphic name (LName). This data needs preprocessing; stratigraphic data with LNames not present in all reference wells must be removed to ensure that the LName in each reference well's stratigraphic data exists in other reference wells. The stratigraphic data must include the target stratigraphic data, which is determined by the operator. Reference wells can be vertical or deviated, as the wellbore trajectory can be determined by importing the directional data. The boundary depth (MD) is the measured well depth. The stratigraphic interpretation for each reference well may come from different interpreters, and the stratigraphic divisions may differ.

[0087] Step 2: Calculate the 3D coordinate data of the horizontal well and the reference well around the horizontal well based on the directional data from Step 1. The 3D coordinates of the reference well's trajectory can be determined based on the boundary depth (MD) from Step 1. Each layer has its own boundary depth (MD), and the corresponding position can be found on the reference well trajectory based on this depth (obtaining the 3D coordinates of the corresponding position).

[0088] Step 3: Based on the three-dimensional coordinate data of the trajectory in Step 2, calculate the correlation between each reference well level and each measurement point on the horizontal well trajectory, and record the reference well nWelli with the lowest correlation for each measurement point. See also... Figure 2 The correlation calculation process involves first combining the reference well layer data from step 1 and the calculation results from step 2 to obtain the three-dimensional coordinates of each layer in the reference well, and then calculating the distance Gn between each layer and the horizontal well trajectory measurement point. (xn, yn, zn) is obtained using the boundary depth MD in the three-dimensional coordinate data of the reference well trajectory.

[0089]

[0090] Where (xn, yn, zn) are the three-dimensional coordinates of the nth layer; (xH, yH, zH) are the three-dimensional coordinates of the horizontal well measurement point H;

[0091] Then, calculate the weight Qn (n=1,2,3,...,N) of each stratum based on the elevation difference between each stratum and the target stratum:

[0092]

[0093] Here, zg is the z-value of the target layer's 3D data. The total weight is 1, with the target layer accounting for 0.5 and the remaining layers accounting for the remaining 0.5. This 0.5 allocation is based on the elevation difference between each layer and the target layer. The reciprocal is because the larger the elevation difference, the smaller the weight should be.

[0094] The target layer weight is set to Qg = 0.5;

[0095] The formula for calculating the parameter Cor of the reference well and horizontal well trajectory measurement points is as follows:

[0096]

[0097] Where Gg is the distance between the target layer location (xg, yg, zg) and the measurement point H (xH, yH, zH). In the calculation of the parameter Cor for the reference well and the horizontal well, the main influencing factor is the distance from the horizontal well measurement point to the target layer in the reference well. The weights of other layer points on the reference well are also calculated based on the target layer, therefore, the elevation difference between other layers and the target layer is used as the calculation basis.

[0098] Step 4: Based on the results of Step 3, divide the horizontal well trajectory into several first-level interpretation segments; each first-level interpretation segment records the well depth range (the depth of the horizontal well) and its corresponding reference well, nWelli. See also... Figure 3 The interpretation segment division rule is to connect adjacent measurement points on the horizontal well trajectory that share the same nWelli value to form a single first-level interpretation segment. For example, interpretation segment 1 is from a horizontal well depth of 1000–1200 m, belonging to reference well nwell2; interpretation segment 2 is from a horizontal well depth of 1200–1300 m, belonging to reference well nwell5. Measurement point n is at a well depth of 1300 m, and measurement point n+1 is at a well depth of 1305 m. When both measurement points are related to reference well nwellX, a first-level interpretation segment is generated. This interpretation segment is from a horizontal well depth of 1300–1305 m, belonging to reference well nwellX.

[0099] Step 5: Perform stratigraphic analysis on each first-level interpretation segment from Step 4. Compare and analyze the logging data of horizontal wells and the reference well nWelli data within each first-level interpretation segment. Use the nWelli data from the reference well to compare with the horizontal well data for each first-level interpretation segment, and use the nWelli stratigraphic data to form the second-level stratigraphic interpretation within each first-level interpretation segment. See [link / reference] Figure 4 A primary interpretation segment may contain several secondary layer interpretations. Secondary layer interpretations record the depth of the horizontal well (lateral positioning) and the difference in layer elevation between the interpretation segment and the reference well nWelli (vertical positioning). Well logging data may include, for example, natural gamma ray and resistivity.

[0100] Step 6: Connect all the secondary layer interpretations according to the layer and display them on the monitor.

[0101] In this embodiment, the horizontal well tracking method based on multiple reference wells imports data from multiple reference wells into the system. Based on the correlation between the reference wells and the horizontal wells, the interpretation profile is automatically divided into multiple primary interpretation segments along the horizontal well trajectory. These segments are then interpreted in stratigraphic sections, thus realizing the flow of the directional tracking method based on multiple reference wells. Formation interpretation is required during directional tracking; in this case, the secondary interpretation segment is the formation interpretation, which assists in directional decision-making.

[0102] In this embodiment, a horizontal well tracking method, device, electronic equipment, and storage medium based on multiple reference wells include: Step 1, importing horizontal well directional data and logging data, and importing horizontal well perimeter reference well directional data, logging data, and stratigraphic data; Step 2, calculating the three-dimensional coordinate data of the trajectory of the horizontal well and the horizontal well perimeter reference wells based on the directional data in Step 1; Step 3, calculating the correlation between each reference well stratigraphic level and each measurement point on the horizontal well trajectory based on the trajectory three-dimensional coordinate data in Step 2, and recording the reference well with the highest correlation for each measurement point; Step 4, dividing the horizontal well trajectory into several first-level interpretation segments based on the results of Step 3; Step 5, performing stratigraphic analysis on each first-level interpretation segment in Step 4 to form second-level stratigraphic interpretations within each first-level interpretation segment; Step 6, connecting all second-level stratigraphic interpretations by stratigraphic level and displaying them on a monitor. In this embodiment, by importing data from multiple reference wells into the system, automatically dividing the interpretation profile into multiple first-level interpretation segments along the horizontal well trajectory based on the correlation between the reference wells and the horizontal well, and then performing stratigraphic interpretation segment by segment, a directional tracking method based on multiple reference wells is realized.

[0103] Example 3

[0104] Based on the above embodiments, this embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the method described in the above embodiments.

[0105] In some embodiments of this example, a computer-readable storage medium is provided, on which a computer program is stored, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0106] In some embodiments of this example, a computer program product is provided, including a computer program / instructions, characterized in that the computer program, when executed by a processor, implements the steps of the method described in the above embodiments.

[0107] The processor may include, but is not limited to, one or more processors or microprocessors. Each processor may be implemented as an Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor, or other electronic component, for executing the methods described in the above embodiments.

[0108] Computer-readable storage media can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Computer-readable storage media may include, but are not limited to, random access memory (RAM), read-only memory (ROM), flash memory, EPROM memory, EEPROM memory, registers, and computer storage media (e.g., hard disks, floppy disks, solid-state drives, removable disks, CD-ROMs, DVD-ROMs, Blu-ray discs, etc.).

[0109] Computer-readable storage media may also store at least one computer-executable program / instruction, such as computer-readable instructions. Computer-readable storage media include, but are not limited to, volatile memory and / or non-volatile memory. Volatile memory may include, for example, random access memory (RAM) and / or cache memory. Computer-readable storage media may include, for example, read-only memory (ROM), hard disk, flash memory, etc. For example, a non-transitory computer-readable storage medium may be connected to a computing device such as a computer, and then, when the computing device executes the computer-readable instructions stored on the computer-readable storage medium, the various methods described above can be performed.

[0110] In addition, the computer device may include (but is not limited to) a data bus, an input / output (I / O) bus, a display, and input / output devices (e.g., keyboard, mouse, speakers, etc.).

[0111] The processor can communicate with external devices via the I / O bus through wired or wireless networks.

[0112] In one embodiment, the at least one computer-executable instruction may also be compiled into or comprise a software product / computer program product, wherein one or more computer-executable instructions are executed by a processor to perform the steps of the various functions and / or methods in the embodiments described herein.

[0113] In the embodiments provided in this disclosure, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0114] It should be noted that, in this disclosure, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element limited by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0115] While the embodiments disclosed herein are as described above, the foregoing content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art to which this disclosure pertains may make any modifications and changes in form and detail of the implementation without departing from the spirit and scope of this disclosure; however, the scope of patent protection of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A method for constructing a formation profile for a horizontal well, characterized in that, include: Obtain several test points on the trajectory of the horizontal well; The layer positions on the trajectory of several reference wells within a preset range of the horizontal well are obtained, wherein different layer positions correspond to different layers on the formation profile of the reference wells; For each test point, based on a preset distance coefficient calculation formula, the distance between each reference well and each test point is calculated according to the distance between each layer point on the same reference well and the test point, to obtain the distance coefficient of each reference well to each test point; wherein, in the preset distance coefficient calculation formula, the distance between the test point and the layer point and the distance coefficient are positively correlated; For each test point, the reference well with the smallest distance coefficient is selected as the interpretation well to which the test point belongs; Using the formation profile of the interpretation well to which the test point belongs, the trajectory segment of the horizontal well where the test point is located is interpreted by stratigraphic analysis, and the formation profile of the trajectory segment of the horizontal well where each test point is located is obtained.

2. The construction method according to claim 1, characterized in that, The step of using the formation profile of the interpretation well to which the test point belongs to perform stratigraphic interpretation on the trajectory segment of the horizontal well where the test point is located, and obtaining the formation profile of the trajectory segment of the horizontal well where each test point is located, includes: When several consecutive test points belong to the same reference well, the stratigraphic profiles of the consecutive test points are used to perform stratigraphic interpretation on the trajectory segments of the horizontal wells where the test points are located, and the stratigraphic profiles of the trajectory segments of the horizontal wells where each test point is located are obtained respectively. The trajectory segments are the trajectories of several consecutive test points where the interpretation wells are the same reference wells.

3. The construction method according to claim 1, characterized in that, The step of using the formation profile of the interpretation well to which the test point belongs to perform stratigraphic interpretation on the trajectory segment of the horizontal well where the test point is located, and obtaining the formation profile of the trajectory segment of the horizontal well where each test point is located, includes: When several consecutive test points belong to the same reference well, the trajectory of the horizontal wells where the several consecutive test points belong to the same reference well is divided into first-level interpretation segments to obtain each first-level interpretation segment. Trajectory points are selected from the same first-level interpretation segment as second-level interpretation points; The logging data of the secondary interpretation point and the logging data of the interpretation well are compared for similarity, and matching points similar to the secondary interpretation point are determined in the formation profile of the interpretation well; When interpreting the secondary interpretation point using the formation profile of the interpretation well, the relative position of the formation profile of the interpretation well and the secondary interpretation point is determined according to the relative position of the matching point in the formation profile of the interpretation well, thereby obtaining the formation profile of the trajectory segment of the horizontal well where the secondary interpretation point is located.

4. The construction method according to claim 1, characterized in that, The step of calculating the distance coefficient between each reference well and each test point based on a preset distance coefficient calculation formula, according to the distance between each layer point on the same reference well and the test point, to obtain the distance coefficient of each reference well to each test point, includes: The location data of each of the aforementioned layer sites in several of the aforementioned reference wells are obtained respectively; The distance between each layer point on each reference well and the test point is calculated based on the location data of each layer point on each reference well and the location data of the test point. For each reference well, a weighted calculation is performed based on the preset distance coefficient calculation formula, taking into account the distance between each layer point and the test point on the same reference well and the weight of each layer point, to obtain the distance coefficient between each reference well and the test point.

5. The construction method according to claim 4, characterized in that, The stratum points include points of the target stratum and points of adjacent stratums. The target stratum and the adjacent stratums are distributed consecutively along the elevation direction, and the weight of the points of the target stratum is greater than the weight of the points of the adjacent stratum.

6. The construction method according to claim 5, characterized in that, The weights of the points in the adjacent layers are calculated based on a preset weighting formula using the absolute values ​​of the elevation differences between each of the adjacent layers and the target layer. The weights of the adjacent layers are inversely correlated with the absolute values ​​of the elevation differences between the adjacent layers and the target layer.

7. The construction method according to claim 5, characterized in that, The weight of the nth neighboring layer point is calculated as follows: Where Qn represents the weight of the nth neighboring layer point, k represents the layer division coefficient, the value of k is greater than 0 and less than 1, N represents the total number of neighboring layer points, and z n -z g z represents the elevation difference between the nth neighboring layer point and the target layer point. a -z g This represents the elevation difference between the a-th neighboring layer point and the target layer point; The formula for calculating the weight of the point at the target layer is as follows: Q g =1-k Where Qg represents the weight of the point at the target layer.

8. A computer device, comprising a memory, a processor, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the steps of the method according to any one of claims 1 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 7.

10. A computer program product, comprising a computer program, characterized in that, When executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 7.

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