Horizontal well straightening comparison method and device considering stratigraphic dip angle

Abstract

The invention relates to the technical field of geophysical exploration, in particular to a horizontal well straightening comparison method and device considering a stratigraphic dip angle, and the method comprises the steps: obtaining measurement while drilling information of a target horizontal well, a reference well of the target horizontal well and the stratigraphic dip angle of a target stratum; according to the measurement-while-drilling information, the true vertical depth and the horizontal distance from a target point of the target horizontal well to a wellhead starting point are determined; according to the stratigraphic dip angle, the true vertical depth and the horizontal distance, the apparent vertical depth of the target spot is determined, and according to the apparent vertical depth, the target horizontal well track is straightened in combination with the logging curve of the reference well; and the straightened target horizontal well is compared with the reference well, so that straightening comparison of the target horizontal well is completed. The problems that when horizontal well straightening comparison is carried out under complex geological conditions at present, due to the fact that the influence of a stratigraphic dip angle is not considered, the accuracy of a horizontal section straightening comparison result in the horizontal well guiding process is low, and the drilling rate of a horizontal well is reduced are solved.

Description

Technical Field

[0001] The invention relates to the technical field of geophysical exploration, and in particular to a method and device for horizontal well straightening comparison considering formation dip angle. Background Art

[0002] Horizontal wells have the advantages of large oil drainage area, high single well production, high penetration, high reserve utilization, and the ability to avoid obstacles and harsh environmental areas, providing an effective means for the effective exploitation of thin and ultra-thin oil layers. The rapid development of horizontal well geosteering technology has enabled the horizontal section trajectory to be controlled within a horizontal range of vertical depth change <0.5m and left and right swing <2.5m. The screening standard for the thickness of the designed horizontal well oil layer has been reduced from more than 6m to the current 1m. The core of the horizontal well steering technology is the technology for straightening and comparing the horizontal well trajectory.

[0003] The methods for the alignment and comparison of multiple horizontal wells in the currently available literature and patents are mainly based on the alignment of the well inclination and azimuth of the measurement data while drilling. Therefore, the following shortcomings exist in the alignment and comparison methods of horizontal wells: the influence of the well inclination and formation dip angle is not considered. For the same true thickness of the formation, the measured formation thickness, vertical thickness, and apparent vertical thickness are different under different formation dip angles. The greater the dip angle, the greater the influence. Therefore, due to the influence of the formation dip angle, the alignment and comparison prediction accuracy of the horizontal section is affected. Summary of the invention

[0004] The present invention proposes a horizontal well straightening comparison method and device taking into account the formation dip angle, so as to solve the problem that when performing horizontal well straightening comparison under complex geological conditions, the influence of the formation dip angle is not taken into account, resulting in low accuracy of the horizontal section straightening comparison result during the horizontal well guidance process, leading to a reduced horizontal well drilling rate.

[0005] According to one aspect of the present invention, a horizontal well alignment comparison method considering formation dip is provided, comprising: Obtaining measurement while drilling information of the target horizontal well, the reference well of the target horizontal well, and the formation inclination of the target layer; Determine the true vertical depth and horizontal distance of a target point of a target horizontal well from a wellhead starting point according to the measurement while drilling information; Determine the apparent vertical depth of the target point according to the formation inclination, true vertical depth and horizontal distance, and straighten the target horizontal well trajectory according to the apparent vertical depth and in combination with the logging curve of the reference well; The straightened target horizontal well is compared with the reference well, thereby completing the straightening comparison of the target horizontal well.

[0006] Preferably, the measurement while drilling information includes at least: well inclination angle and target horizontal well trajectory length.

[0007] Preferably, the method for determining the true vertical depth and horizontal distance of the target point of the target horizontal well from the wellhead starting point according to the measurement while drilling information comprises: The true vertical depth = target horizontal well trajectory length * cos (well inclination angle); The horizontal distance = target horizontal well trajectory length * sin (well inclination angle).

[0008] Preferably, the method for determining the apparent vertical depth of the target point according to the formation dip angle, true vertical depth and horizontal distance comprises: The apparent vertical depth of the starting target is equal to the true vertical depth of the starting target; If the formation dip angle of the target point is the same as that of the previous adjacent target point, then: Target point apparent vertical depth = target point true vertical depth + (target point horizontal distance - adjacent previous target point horizontal distance) * tan target point formation inclination + previous target point offset distance; If the formation dip angle of the target point is different from that of the previous adjacent target point, then: The apparent vertical depth of the target point = the true vertical depth of the target point + (horizontal distance of the target point - horizontal distance of the formation dip change point) * tan the formation dip of the target point + (horizontal distance of the formation dip change point - horizontal distance of the previous target point of the formation dip change point) * tan the formation dip of the previous target point of the formation dip change point + the offset distance of the previous target point of the formation dip change point.

[0009] Preferably, the calculation formula of the offset distance includes: Offset distance = true vertical depth - apparent vertical depth.

[0010] Preferably, before obtaining the reference well of the target horizontal well, determining the reference well of the target horizontal well, the method includes: Select the wells that are in the same area as the target horizontal well, have the same sedimentary environment as the target horizontal well, have continuous core of the target layer and / or wellbore conditions that meet the requirements as the preferred wells; The well closest to the target horizontal well is selected from all the preferred wells as the reference well.

[0011] Preferably, the method for straightening the trajectory of the target horizontal well according to the apparent vertical depth and in combination with the logging curve of the reference well comprises: The curve that most obviously responds to the target layer characteristics in the target horizontal well logging curve is selected as the comparison curve, and the comparison curve is compared and analyzed with the logging curve of the corresponding reference well. Combined with the apparent vertical depth, the trajectory of the target horizontal well is segmentally straightened.

[0012] According to one aspect of the present disclosure, a horizontal well alignment comparison device considering formation inclination is provided, comprising: An acquisition unit, used to acquire measurement while drilling information of a target horizontal well, a reference well of the target horizontal well, and a formation dip of a target layer; A true vertical depth and horizontal distance determination unit, used to determine the true vertical depth and horizontal distance of a target point of a target horizontal well from a wellhead starting point according to the measurement while drilling information; A well trajectory straightening unit, used to determine the apparent vertical depth of the target point according to the formation inclination, true vertical depth and horizontal distance, and to straighten the target horizontal well trajectory according to the apparent vertical depth in combination with the well logging curve of the reference well; The comparison unit is used to compare the straightened target horizontal well with the reference well, thereby completing the straightening comparison of the target horizontal well.

[0013] The present invention has at least the following beneficial effects: The present invention proposes a horizontal well straightening and comparison method and device taking into account the formation dip angle. The apparent vertical depth of the target point is determined by the formation dip angle, true vertical depth and horizontal distance corresponding to the target point. The target horizontal well is straightened by the apparent vertical depth and the logging curve of the reference well, eliminating the influence of the formation dip angle. The apparent vertical depth in the vertical well mode is used for formation comparison, thereby improving the horizontal section comparison and target penetration accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings herein are incorporated into and constitute a part of the specification. These drawings illustrate embodiments consistent with the present invention and, together with the specification, are used to explain the technical solutions of the present invention.

[0015] Figure 1 A flow chart showing a horizontal well alignment comparison method considering formation inclination according to an embodiment of the present invention; Figure 2 A cross-sectional view showing a reference well according to an embodiment of the present invention; Figure 3 A schematic diagram showing formation dip angle and well inclination angle according to an embodiment of the present invention is shown; Figure 4 A schematic diagram showing the apparent vertical depth of a target horizontal well according to an embodiment of the present invention is shown; Figure 5 A schematic diagram showing the formation conditions at different inclination angles of the horizontal well trajectory according to an embodiment of the present invention is shown. Implementation

[0016] Various exemplary embodiments, features and aspects of the present invention will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0017] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0018] The term "and / or" herein is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the term "at least one" herein represents any combination of at least two of any one or more of a plurality of. For example, including at least one of A, B, and C can represent including any one or more elements selected from the set consisting of A, B, and C.

[0019] In addition, in order to better illustrate the present invention, numerous specific details are provided in the following specific embodiments. It should be understood by those skilled in the art that the present invention can be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present invention.

[0020] Figure 1 A flow chart showing a horizontal well alignment comparison method considering formation inclination according to an embodiment of the present invention; Figure 2 A cross-sectional view showing a reference well according to an embodiment of the present invention; Figure 3 A schematic diagram showing formation dip angle and well inclination angle according to an embodiment of the present invention is shown; Figure 4 5 shows a schematic diagram of the vertical depth of the target horizontal well according to an embodiment of the present invention; 5 shows a schematic diagram of the horizontal well trajectory at different inclination angles according to an embodiment of the present invention. Figure 1-5 As shown, a horizontal well straightening and comparison method considering formation dip angle comprises: step S01: acquiring the measurement while drilling information of the target horizontal well, the reference well of the target horizontal well and the formation dip angle of the target layer; step S02: determining the true vertical depth and horizontal distance of the target point of the target horizontal well from the wellhead starting point according to the measurement while drilling information; step S03: determining the apparent vertical depth of the target point according to the formation dip angle, the true vertical depth and the horizontal distance, and straightening the trajectory of the target horizontal well according to the apparent vertical depth and in combination with the logging curve of the reference well; step S04: comparing the straightened trajectory of the target horizontal well with the reference well to complete the straightening and comparison of the target horizontal well.

[0021] The horizontal well alignment comparison method considering formation dip angle provided by the embodiment of the present invention specifically comprises the following steps: Step S01: Acquire measurement while drilling information of a target horizontal well, a reference well of the target horizontal well, and a formation dip of a target layer.

[0022] In the present invention, the measurement while drilling information at least includes: well inclination angle and target horizontal well trajectory length.

[0023] In the present invention, before obtaining the reference well of the target horizontal well, the reference well of the target horizontal well is determined, and the method includes: selecting as a preferred well a well that is in the same area as the target horizontal well, has the same sedimentary environment as the target horizontal well, has a continuous core of the target layer and / or has wellbore conditions that meet the requirements; and selecting, from all the preferred wells, a well that is closest to the target horizontal well as the reference well.

[0024] In the embodiment of the present invention, according to the actual underground geological conditions of the horizontal well, vertical wells in the same area that are close to the horizontal well, have the same sedimentary environment, continuous lithology of the target layer, and good wellbore conditions are preferably used as reference vertical wells for horizontal well alignment comparison.

[0025] Figure 2 It is a columnar profile diagram of a preferred reference well in an embodiment of the present invention. The reference well is a vertical well, which is 150 meters away from the wellhead of the horizontal well and has the same sedimentary environment. The well is lithologically continuous with the target layer of the horizontal well and has good wellbore conditions.

[0026] In addition to the well inclination, the measurement while drilling information also includes measurement while drilling data such as azimuth. Among them, the logging while drilling data such as gamma and resistivity should also be collected. The measurement while drilling data is important data in the horizontal well straightening process, and the logging while drilling data is an important basis for comparison in the well data comparison process.

[0027] Figure 3 The schematic diagram of the formation dip angle and the well inclination angle between the horizontal well trajectory and the inclined target layer is shown, and the schematic diagram between different intersection angles and different thicknesses is also marked in the figure. In the figure, the intersection angle between the target layer m and the horizontal line is the formation dip angle a; the intersection angle between the trajectory line and the formation is the cut-in angle b; the intersection angle between the trajectory line and the vertical line is the well inclination angle c; the distance from the point where the trajectory enters the target layer to the intersection point of the vertical line and the bottom of the target layer is the apparent vertical thickness d; the distance from the point where the trajectory enters the target layer to the point where the trajectory exits the target layer is the measured thickness e, the vertical distance from the point where the trajectory enters the target layer to the point where the trajectory exits the target layer is the vertical thickness f, and the vertical distance from the top and bottom interfaces of the target layer is the formation thickness g.

[0028] Due to the influence of well inclination and formation dip, the formation measured thickness, vertical thickness, and apparent vertical thickness of the same true thickness formation at different formation dips are different. The greater the dip, the greater the impact. Therefore, due to the influence of the dip, the accuracy of the comparison prediction of the horizontal section is affected. In order to eliminate the influence of formation dip and well inclination as much as possible, the adjacent wells and the target wells are depth corrected, and the apparent vertical thickness in the vertical well mode is used for formation comparison.

[0029] Step S02: Determine the true vertical depth and horizontal distance of the target point of the target horizontal well from the wellhead starting point according to the measurement while drilling information.

[0030] In the present invention, the method for determining the true vertical depth and horizontal distance of the target point of the target horizontal well from the wellhead starting point according to the measurement while drilling information comprises: The true vertical depth = target horizontal well trajectory length * cos (well inclination angle) (1); The horizontal distance = target horizontal well trajectory length * sin (well inclination angle) (2).

[0031] In the embodiment of the present invention, under the condition that the azimuth angle remains unchanged, the calculation formulas for the true vertical depth and horizontal distance corresponding to the target point are as shown in Formula (1) and Formula (2).

[0032] like Figure 4 The figure shows a schematic diagram of the apparent vertical depth of each target point in the target well in the embodiment of the present invention. In the figure, point A is the starting point of the wellhead. The drill bit drills toward the target formation m. When reaching the target point B, the measurement while drilling information of the target point B is obtained, that is, the well inclination angle and the well trajectory length corresponding to the target point B are substituted into formulas (1) and (2) to calculate the true vertical depth and horizontal distance corresponding to the target point B. Among them, the horizontal distance of the target point is the horizontal distance between the target point and the vertical line, that is, the distance between the target point B and B'; the true vertical depth of the target point is the vertical distance between the starting point and the horizontal line of the target point, that is, the distance between the starting point A and B'.

[0033] Step S03: Determine the apparent vertical depth of the target point according to the formation dip, true vertical depth and horizontal distance, and straighten the target horizontal well trajectory according to the apparent vertical depth in combination with the logging curve of the reference well.

[0034] In the present invention, the method for determining the apparent vertical depth of the target point according to the formation dip angle, true vertical depth and horizontal distance comprises: The apparent vertical depth of the starting target is equal to the true vertical depth of the starting target; If the formation dip angle corresponding to the target point is the same as the formation dip angle of the previous target point, then: Target point apparent vertical depth = target point true vertical depth + (target point horizontal distance - previous target point horizontal distance) * tan target point formation inclination + previous target point offset distance (3); If the formation dip angle corresponding to the target point is different from the formation dip angle of the previous target point, then: The apparent vertical depth of the target point = the true vertical depth of the target point + (horizontal distance of the target point - horizontal distance of the formation dip angle change point) * tan the formation dip angle of the target point + (horizontal distance of the formation dip angle change point - horizontal distance of the previous target point of the formation dip angle change point) * tan the formation dip angle of the previous target point of the formation dip angle change point + the offset distance of the previous target point of the formation dip angle change point (4).

[0035] In the present invention, the calculation formula of the offset distance includes: offset distance=true vertical depth-apparent vertical depth.

[0036] In the embodiment of the present invention, the formation dip is positive for upward dip and negative for downward dip; the different formation dips through which the target horizontal well trajectory passes are obtained as x, y, z, and k, respectively.

[0037] The apparent vertical depth of target point A (starting point) = the true vertical depth of target point A, and the offset distance of target point A = 0; Since the formation dip angle corresponding to target point B is the same as that corresponding to target point A, then: Apparent vertical depth of target B = true vertical depth of target B + (horizontal distance of target B - horizontal distance of target A) *tanB target corresponding formation inclination x; Since target point C and target point B are at the same formation dip angle, then: Apparent vertical depth of target C = true vertical depth of target C + (horizontal distance of target C - horizontal distance of target B) *tanx corresponding formation inclination of target C + offset distance of target B; Since target point C is the inflection point of the two formation dips, target point C to target point D are at the same formation dip, then: D target point apparent vertical depth = D target point true vertical depth + (D target point horizontal distance - C target point horizontal distance) * tanD target point corresponding formation inclination y + C target point offset distance; Since target point E and target point D are at the same formation dip angle, then: E target point apparent vertical depth = E target point true vertical depth + (E target point horizontal distance - D target point horizontal distance) * tanE target point corresponding formation inclination y + D target point offset distance; Since target point E is the inflection point of two formation dips, target points E to F are at the same formation dip, then: Apparent vertical depth of target F = true vertical depth of target F + (horizontal distance F - horizontal distance E) * tanF target corresponding formation inclination angle z + target E offset distance; Since the formation dip angle corresponding to target point G is different from that of target point F, then: Apparent vertical depth of target G = true vertical depth of target G + (horizontal distance of target G - horizontal distance of target E) * tanG target corresponding formation inclination k + (horizontal distance of target E - horizontal distance of target D) * tanE target corresponding formation inclination y + D target offset distance.

[0038] In formula (4), the formation dip change point is the previous formation dip change point of the target point, that is, the previous target point of target point G is F, but the formation dip at F has not changed, then the previous formation dip change point of target point G is target point E, that is, the inflection point of the well trajectory. Generally, the inflection point of the well trajectory will correspond to the change point of the formation dip.

[0039] In the present invention, the method for straightening the trajectory of the target horizontal well according to the apparent vertical depth in combination with the logging curve of the reference well includes: selecting a curve in the logging curve of the target horizontal well that most obviously responds to the characteristics of the target layer as a comparison curve, comparing and analyzing the comparison curve with the logging curve of the corresponding reference well, and straightening the trajectory of the target horizontal well in sections in combination with the apparent vertical depth.

[0040] In the embodiment of the present invention, when the drill bit drills to each target point, the apparent vertical depth corresponding to the target point is calculated according to the above method, and the accurate position of the drill bit in the target layer is determined in combination with the corresponding reference well logging curve, so as to guide the drill bit position and the horizontal well trajectory, and straighten the horizontal well trajectory so that it can be in the target layer as much as possible. The straightening process is: segmenting using adjacent target points, converting the target horizontal well curve to the vertical well position according to the apparent vertical depth of the target point, and finally straightening the horizontal well curve to the vertical well curve.

[0041] The logging curves in the target horizontal well that have obvious response to the target layer characteristics are used as comparison curves, such as gamma, resistivity, acoustic time difference, etc. The horizontal section is segmented and straightened according to the vertical depth corresponding to the target point, and the logging curves with obvious characteristic response in the straightened target horizontal well logging curves, that is, the comparison curves, are compared and analyzed with the logging curves corresponding to the reference well to determine the accurate position of the target point in the horizontal well layer.

[0042] For a single horizontal well, different formation dips and well inclinations are used to divide different layers. The formation dip information of different layers is read, and the apparent vertical thickness of each layer is calculated according to the layers. The calculated apparent vertical thickness of each layer is accumulated or interpolated, so that the apparent vertical thickness map of the entire well can be obtained.

[0043] The apparent vertical depths of the points calculated above are uniformly attributed to the apparent vertical depth to point A. The formation dip is positive if it is downward and negative if it is upward. When calculating the apparent vertical thickness of the next section, the apparent vertical offsets of the previous sections, i.e., the offset distance, should be accumulated.

[0044] Since each well is located in a different structural position and has different formation development and occurrence, it is necessary to consider both the updip and downdip situations of the formation in the process of horizontal well trajectory segmentation. In each case, eight practical situations need to be considered, including the up-dip and down-dip situations of the trajectory for the target layer, and whether the vertical depth increases when the sandstone is exhumed.

[0045] like Figure 5 As shown, the situation in Figure (I) is that the formation is down-dipping, and the trajectory cuts down the formation; the situation in Figure (II) is that the formation is up-dipping, and the trajectory cuts down the formation; the situation in Figure (III) is that the formation is down-dipping, and the trajectory cuts up the formation; the situation in Figure (IV) is that the formation is up-dipping, and the trajectory cuts up the formation; the situation in Figure (V) is that the formation is down-dipping, the vertical depth increases, and the sandstone returns; the situation in Figure (VI) is that the formation is down-dipping, the vertical depth decreases, and the sandstone returns; the situation in Figure (VII) is that the formation is up-dipping, the vertical depth decreases, and the sandstone returns; the situation in Figure (VIII) is that the formation is up-dipping, the vertical depth increases, and the sandstone returns. The method of the present invention fully considers and includes the above eight situations, and can calculate the accurate apparent vertical depth corresponding to each target point, thereby making the horizontal well trajectory straightening more accurate.

[0046] Step S04: Compare the straightened target horizontal well with the reference well to complete the straightening comparison of the target horizontal well.

[0047] In the embodiment of the present invention, the well logging curves of the fully aligned target horizontal wells are compared with the well logging curves of the reference wells to determine the location of the target horizontal well section, providing data support for the next step of perforation and fracturing scheme design.

[0048] It can be understood that the above-mentioned various method embodiments mentioned in the present invention can be combined with each other to form a combined embodiment without violating the principle logic. Due to space limitations, the present invention will not go into details.

[0049] The execution subject of the horizontal well alignment comparison method considering the formation dip angle may be a horizontal well alignment comparison device considering the formation dip angle, for example, the horizontal well alignment comparison method considering the formation dip angle may be executed by a terminal device or a server or other processing device, wherein the terminal device may be a user equipment (UE), a mobile device, a user terminal, a terminal, a cellular phone, a cordless phone, a personal digital assistant (PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, etc. In some possible implementations, the horizontal well alignment comparison method considering the formation dip angle may be implemented by a processor calling a computer-readable instruction stored in a memory.

[0050] Those skilled in the art will appreciate that, in the above method of specific implementation, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0051] The present invention provides a horizontal well straightening and comparison device taking formation dip into consideration, comprising: an acquisition unit, used for acquiring measurement while drilling information of a target horizontal well, a reference well of the target horizontal well and a formation dip of a target layer; a true vertical depth and horizontal distance determination unit, used for determining the true vertical depth and horizontal distance of a target point of the target horizontal well from a wellhead starting point according to the measurement while drilling information; a well trajectory straightening unit, used for determining the apparent vertical depth of the target point according to the formation dip, the true vertical depth and the horizontal distance, and straightening the trajectory of the target horizontal well according to the apparent vertical depth in combination with a logging curve of the reference well; and a comparison unit, used for comparing the straightened target horizontal well with the reference well, thereby completing the straightening and comparison of the target horizontal well.

[0052] In some embodiments, the functions or modules and units included in the device provided by the embodiment of the present invention can be used to execute the method described in the above method embodiment. Its specific implementation can refer to the description of the above method embodiment. For the sake of brevity, it will not be repeated here.

[0053] The present invention solves the practical problem that the horizontal well drilling rate is reduced due to inaccurate alignment and comparison of the horizontal section during the horizontal well guidance process under complex geological conditions. By obtaining the apparent vertical depth of the target point, the accurate position of the drill bit can be determined during the drilling process to guide the subsequent horizontal well guidance. After the drilling is completed, the perforation scheme design can be assisted.

[0054] Aiming at the existing horizontal well trajectory straightening technology, the present invention introduces the concept of formation dip, combines the horizontal well trajectory information with the formation dip information, eliminates the influence of the formation dip and the well inclination angle, considers the two situations of formation updip and downdip, and adds the situations of trajectory going out of layer, going out of layer and returning within the trajectory layer, etc., uses the apparent vertical thickness in the vertical well mode to perform formation comparison, returns the horizontal well trajectory to the correct depth and compares the curve with the reference well, effectively improves the horizontal section comparison and target penetration accuracy as well as the success rate of horizontal well geosteering.

[0055] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A horizontal well alignment comparison method considering formation dip, characterized in that: include: Obtaining measurement while drilling information of the target horizontal well, the reference well of the target horizontal well, and the formation inclination of the target layer; Determine the true vertical depth and horizontal distance of a target point of a target horizontal well from a wellhead starting point according to the measurement while drilling information; Determine the apparent vertical depth of the target point according to the formation inclination, true vertical depth and horizontal distance, and straighten the target horizontal well trajectory according to the apparent vertical depth and in combination with the logging curve of the reference well; The straightened target horizontal well is compared with the reference well, thereby completing the straightening comparison of the target horizontal well.

2. The horizontal well alignment comparison method considering formation dip angle according to claim 1, characterized in that: The measurement while drilling information includes at least: well inclination angle and target horizontal well trajectory length.

3. The horizontal well alignment comparison method considering formation dip angle according to claim 2 is characterized in that: The method for determining the true vertical depth and horizontal distance of a target point of a target horizontal well from a wellhead starting point based on measurement while drilling information comprises: The true vertical depth = target horizontal well trajectory length * cos (well inclination angle); The horizontal distance = target horizontal well trajectory length * sin (well inclination angle).

4. The horizontal well alignment comparison method considering formation dip angle according to claim 1, characterized in that: The method for determining the apparent vertical depth of a target point according to the formation dip angle, true vertical depth and horizontal distance comprises: The apparent vertical depth of the starting target is equal to the true vertical depth of the starting target; If the formation dip angle of the target point is the same as that of the previous adjacent target point, then: Target point apparent vertical depth = target point true vertical depth + (target point horizontal distance - adjacent previous target point horizontal distance) * tan target point formation inclination + previous target point offset distance; If the formation dip angle of the target point is different from that of the previous adjacent target point, then: The apparent vertical depth of the target point = the true vertical depth of the target point + (horizontal distance of the target point - horizontal distance of the formation dip change point) * tan the formation dip of the target point + (horizontal distance of the formation dip change point - horizontal distance of the previous target point of the formation dip change point) * tan the formation dip of the previous target point of the formation dip change point + the offset distance of the previous target point of the formation dip change point.

5. The horizontal well alignment comparison method considering formation dip angle according to claim 4 is characterized in that: The calculation formula of the offset distance includes: Offset distance = true vertical depth - apparent vertical depth.

6. The horizontal well alignment comparison method considering formation dip angle according to claim 1, characterized in that: Before obtaining the reference well of the target horizontal well, determining the reference well of the target horizontal well, the method includes: Select the wells that are in the same area as the target horizontal well, have the same sedimentary environment as the target horizontal well, have continuous core of the target layer and / or wellbore conditions that meet the requirements as the preferred wells; The well closest to the target horizontal well is selected from all the preferred wells as the reference well.

7. The horizontal well alignment comparison method considering formation dip angle according to any one of claims 1 to 6, characterized in that: The method for straightening the trajectory of the target horizontal well according to the apparent vertical depth and in combination with the logging curve of the reference well comprises: The curve that most obviously responds to the target layer characteristics in the target horizontal well logging curve is selected as the comparison curve, and the comparison curve is compared and analyzed with the logging curve of the corresponding reference well. Combined with the apparent vertical depth, the trajectory of the target horizontal well is segmentally straightened.

8. A horizontal well alignment comparison device taking into account formation inclination, characterized in that: include: An acquisition unit, used to acquire measurement while drilling information of a target horizontal well, a reference well of the target horizontal well, and a formation dip of a target layer; A true vertical depth and horizontal distance determination unit, used to determine the true vertical depth and horizontal distance of a target point of a target horizontal well from a wellhead starting point according to the measurement while drilling information; A well trajectory straightening unit, used to determine the apparent vertical depth of the target point according to the formation inclination, true vertical depth and horizontal distance, and to straighten the target horizontal well trajectory according to the apparent vertical depth in combination with the well logging curve of the reference well; The comparison unit is used to compare the straightened target horizontal well with the reference well, thereby completing the straightening comparison of the target horizontal well.

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