CN115596419B - Method for designing borehole track and horizontal well thereof - Google Patents

Method for designing borehole track and horizontal well thereof Download PDF

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Publication number
CN115596419B
CN115596419B CN202110767580.7A CN202110767580A CN115596419B CN 115596419 B CN115596419 B CN 115596419B CN 202110767580 A CN202110767580 A CN 202110767580A CN 115596419 B CN115596419 B CN 115596419B
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target
geological
determining
sub
azimuth
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CN115596419A (en
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张海军
杨衍云
郝晨
廖兴松
周宝义
钟小刚
郭秋霞
曲永林
窦同伟
邵力飞
孙景涛
王国娜
关月
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Petrochina Co Ltd
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Petrochina Co Ltd
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/25—Methods for stimulating production
    • E21B43/26—Methods for stimulating production by forming crevices or fractures
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/20—Computer models or simulations, e.g. for reservoirs under production, drill bits

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geophysics And Detection Of Objects (AREA)

Abstract

The application discloses a design method of a well track and a horizontal well, which comprises the following steps: determining the dominant orientation of the crack development of the target geological interval; determining the horizontal projection azimuth of the whole borehole orbit of the target geological interval into the target oil reservoir; determining plane position parameters of each target point in the target geological interval; optimizing plane position parameters and borehole orbit design parameters of each target point in the target geological interval; geological parameters of the complete wellbore trajectory are determined. The design method of the well track increases the length of the horizontal section of the single well, enlarges the oil drainage area of the single well, and effectively improves the productivity and the comprehensive benefit of the single well.

Description

Method for designing borehole track and horizontal well thereof
Technical Field
The invention relates to the technical field of petroleum exploration and development, in particular to a design method of a well track and a horizontal well.
Background
The complex fault block oil reservoir has the characteristics of small, broken, lean, scattered and thin, and has complex structure and oil gas water distribution, if the vertical well is adopted for development, the well pattern density is high, the exploitation time is long, the vertical well control reserves are small, the yield is fast to decrease, the development difficulty is high, and the benefit is not obvious. With the development of oil deposit fine description technology, horizontal well borehole trajectory control technology, geosteering technology and horizontal well staged fracturing technology in recent years, the application of the horizontal well technology has become an important means for developing complex fault block oil reservoirs. The conventional horizontal well is developed, the length of the horizontal section is limited and is generally about 200m, the single well productivity is low, the reservoir reserves are difficult to control, the construction cost is high, and the comprehensive benefit of the single well is low.
Therefore, based on the above situation, a new design type and design method of the wellbore track are needed, the horizontal section length of the complex fault block oil reservoir is increased, the oil drilling rate of the oil reservoir is improved, the reservoir reserve control is realized, and the comprehensive benefits of single well productivity and exploration and development are improved.
Disclosure of Invention
The embodiment of the invention provides a design method of a well track and a horizontal well, which comprehensively consider the drilling engineering and the subsequent operation cost, optimize the well track of a target interval, increase the length of the horizontal section, reduce the construction cost and improve the comprehensive benefit of a single well.
In one aspect, the invention provides a method for designing a wellbore trajectory, comprising the steps of: determining the dominant orientation of the crack development of the target geological interval; determining the horizontal projection azimuth of the complete wellbore orbit of the target geological interval entering the target oil reservoir; determining plane position parameters of each geological target point in the target geological interval; optimizing plane position parameters and borehole orbit design parameters of each geological target point in the target geological interval; geological parameters of the complete wellbore trajectory are determined.
In some alternative embodiments, the step of determining a dominant bearing for fracture development of the target geologic interval comprises: the maximum principal stress location σ H and the minimum principal stress location σ h of the target geologic interval are determined.
In some alternative embodiments, the step of determining the horizontal projection orientation of the complete wellbore trajectory of the target geologic interval into the target reservoir comprises: determining the azimuth vertical to the maximum principal stress azimuth sigma H as the horizontal projection azimuth of the whole borehole orbit of the target geological interval; or determining the difference value theta between the maximum principal stress azimuth sigma H and the minimum principal stress azimuth sigma h, wherein the maximum included angle between the horizontal projection azimuth of the whole borehole orbit of the target geological interval and sigma h is minus or plus (0.5theta+6) °.
In some alternative embodiments, the step of determining the planar position parameters of each geological target point in the target geological interval comprises: determining a wellhead coordinate position; determining the positions of a plurality of geological target points T n in a target geological interval, dividing the whole borehole track into a plurality of sections of continuous sub-borehole tracks D n by any two adjacent geological target points T n and T n+1, wherein n is an integer greater than or equal to 1; sequentially optimizing and determining the positions of geological target points T n of all sub-wellbore tracks according to the sequence of Tn, tn+1, tn+2 and Tn+3 … …; respectively determining the horizontal projection azimuth of each sub-well hole track positioned in the inner area of the target oil reservoir; the azimuth change rate of each sub-wellbore trajectory located in an outer region of the target reservoir is determined separately.
In some alternative embodiments, the optimizing step of determining the location of each sub-wellbore trajectory geological target T n comprises: determining plane position parameters of two geological target points T n and T n+1 of each sub-wellbore trajectory D n; plane position parameters of T n+2 in the sub-wellbore trajectory D n+1 are determined from the geological target point T n+1.
In some alternative embodiments, the step of determining two geological target points T n and T n+1 for each sub-wellbore trajectory D n comprises: a determination is made as to whether two adjacent geological target locations of each sub-wellbore trajectory D n are located at the same fault.
In some alternative embodiments, the step of determining whether the geological target points of the respective sub-wellbore tracks D n are located at the same fault comprises: if two adjacent geological target points forming each sub-borehole track D n are not located in the same fault, determining that an included angle beta between a connecting line of the two geological target points T n and T n+1 and a minimum principal stress azimuth sigma h of the sub-borehole track D n is within (+/-) (0.5θ+6) °, otherwise, adjusting the position of at least one of the geological target points T n and T n+1 until an included angle between the connecting line of the geological target points T n and T n+1 and the minimum principal stress azimuth sigma h is within (+/-) (0.5θ+6) °.
In some alternative embodiments, the step of determining whether the geological target points of the respective sub-wellbore tracks D n are located at the same fault further comprises: determining that two adjacent geological target points of each sub-borehole track D n are located on the same fault, determining that the azimuth change rate K φ of the sub-borehole tracks of the geological target points T n+1 and T n+2 meets a preset value, otherwise, adjusting the position of the geological target point T n+1 until the azimuth change rate K φ of the sub-borehole tracks of the geological target points T n+1 and T n+2 meets the preset value, wherein K φ refers to the speed of well inclination azimuth changing along with well depth.
In some alternative embodiments, the complete wellbore trajectory geologic parameters include at least a horizontal wellhead coordinate location, a plurality of geologic target point coordinate locations, and a vertical depth parameter of the coordinate points.
In another aspect, the invention provides a horizontal well, the complete wellbore trajectory being determined by the method of designing a wellbore trajectory according to any one of claims 1-9.
In some alternative embodiments, the horizontal projection of the horizontal well target geological interval wellbore trajectory is "S-shaped" comprising five of the sub-wellbore trajectories, wherein three of the sub-wellbore trajectories are located in an interior region of the target reservoir and two of the sub-wellbore trajectories are located in an exterior region of the target reservoir.
Compared with the prior art, the invention has the following technical effects:
The dominant azimuth of the development of the target geological interval cracks is determined, and the plane position parameters of each geological target point in the target geological interval are determined, so that the fracturing construction can be facilitated to form cracks orthogonal to the axis of the well, meanwhile, the complete well orthogonal crossing of stratum natural cracks as many as possible is facilitated, and the oil and gas well yield is improved. The horizontal projection azimuth of the whole well track of the target geological interval is determined, the plane position parameters of each geological target point in the target geological interval are optimized, the length of the whole well horizontal section is increased, the oil reservoir drilling rate can be remarkably improved, the single well oil drainage area is enlarged, and the low input and high output of the complex fault block oil reservoir are realized. And the geological parameters of the complete well track are determined, so that the smoothness of the well track is ensured, the drilling construction difficulty is reduced, and the drilling construction efficiency is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to a person skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of maximum and minimum principal stress azimuth vs. fault spread azimuth in a target geological layer provided by an embodiment of the present invention;
FIG. 2 is a schematic illustration of a horizontal orientation of a target geologic formation wellbore trajectory within a target reservoir zone, provided by an embodiment of the invention;
FIG. 3 is a schematic illustration of an adjustment of a geological target point of a first sub-wellbore trajectory of a target geological formation provided by an embodiment of the present invention;
FIG. 4 is a schematic illustration of the adjustment of a geological target point of a second sub-wellbore trajectory of a target geological formation provided by an embodiment of the present invention;
FIG. 5 is a schematic illustration of the adjustment of a geological target point of a third sub-wellbore trajectory of a target geological formation provided by an embodiment of the present invention;
FIG. 6 is a schematic illustration of an adjustment of a geological target point of a fourth sub-wellbore trajectory of a target geological formation provided by an embodiment of the present invention;
FIG. 7 is a schematic illustration of the adjustment of a geological target point of a fifth sub-wellbore trajectory of a target geological formation provided by an embodiment of the present invention;
FIG. 8 is a schematic view of a vertical projection orientation of a preliminary design of a complete wellbore trajectory for a target geologic formation, provided by an embodiment of the invention;
FIG. 9 is a schematic illustration of a horizontal projected azimuth of a complete borehole trajectory for a target geologic formation, in accordance with one embodiment of the invention.
FIG. 10 is a schematic view of a horizontal projected azimuth of a complete borehole trajectory of a target geologic formation, according to yet another embodiment of the invention.
FIG. 11 is a schematic view of a horizontal projected azimuth of a complete borehole trajectory of a target geologic formation, according to another embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The application provides a method for designing a borehole track, which comprises the following steps: determining the dominant orientation of the crack development of the target geological interval; determining the horizontal projection azimuth of the complete wellbore orbit of the target geological interval entering the target oil reservoir; determining plane position parameters of each geological target point in the target geological interval; optimizing plane position parameters and borehole orbit design parameters of each geological target point in the target geological interval; geological parameters of the complete wellbore trajectory are determined.
Specifically, the dominant azimuth of the crack development of the target geological interval is determined, and the plane position parameters of each geological target point in the target geological interval are determined, so that the fracture construction can be facilitated to form cracks orthogonal to the axis of the well bore, meanwhile, the complete well bore can be facilitated to orthogonally pass through natural cracks of stratum as many as possible, and the yield of an oil and gas well is improved. The horizontal projection azimuth of the whole well track of the target geological interval is determined, the plane position parameters of each geological target point in the target geological interval are optimized, the length of the whole well horizontal section is increased, the oil reservoir drilling rate can be remarkably improved, the single well oil drainage area is enlarged, and the low input and high output of the complex fault block oil reservoir are realized. And the geological parameters of the complete well track are determined, so that the smoothness of the well track is ensured, the drilling construction difficulty is reduced, and the drilling construction efficiency is improved.
In some alternative embodiments, the step of determining a dominant bearing for fracture development of the target geologic interval comprises: the maximum principal stress location σ H and the minimum principal stress location σ h of the target geologic interval are determined.
Specifically, if there are data such as the measured data of the core of the target geologic formation, the formation X-MAC log, the FMI log, and the formation dip log, the maximum principal stress azimuth σ H and the minimum principal stress azimuth σ h of the target geologic formation can be determined based on these data.
In some alternative embodiments, the step of determining the horizontal projection orientation of the complete wellbore trajectory of the target geologic interval into the target reservoir comprises: determining the azimuth vertical to the maximum principal stress azimuth sigma H as the horizontal projection azimuth of the whole borehole orbit of the target geological interval; or determining the difference value theta between the maximum principal stress azimuth sigma H and the minimum principal stress azimuth sigma h, wherein the maximum included angle between the horizontal projection azimuth of the whole borehole orbit of the target geological interval and sigma h is minus or plus (0.5theta+6) °.
Specifically, as shown in fig. 1, if there is no data such as the data of the target geological layer for coring, such as the formation X-MAC logging, the FMI logging, and the formation dip logging, the maximum principal stress azimuth σ H and the minimum principal stress azimuth σ h are determined according to the fault trend of the target geological layer, the principal stress perpendicular to the fault spreading azimuth is the minimum principal stress σ h of the target geological layer according to the principle that the crack expands towards the minimum energy loss direction, the azimuth perpendicular to the minimum principal stress σ h (parallel to the fault spreading azimuth) is σ H, and optionally, c is the dominant azimuth of crack development, and c is a constant. The azimuth vertical to sigma H is the horizontal projection azimuth of the complete wellbore orbit of the optimal target interval in the internal area of the target oil reservoir, namely parallel to sigma h, which is favorable for fracturing construction, forming cracks orthogonal to the axis of the wellbore, simultaneously favorable for the wellbore to cross as many natural cracks of the stratum as possible in an orthogonal manner, and improving the yield of the oil and gas well.
Further, as shown in fig. 2, if the horizontal projection azimuth of the track cannot be perpendicular to σ H due to the formation occurrence, determining that the maximum included angle between the horizontal projection azimuth of the whole borehole track of the target geological interval in the inner region of the target reservoir and σ h is ± (0.5θ+6) ° according to the difference θ between the maximum principal stress azimuth σ H and the minimum principal stress azimuth σ h, thereby ensuring that the fracturing effect is less affected.
In some alternative embodiments, the step of determining the planar position parameters of each geological target point in the target geological interval comprises: determining a horizontal wellhead coordinate position; determining the positions of a plurality of geological target points T n in a target geological interval, dividing the whole borehole track into a plurality of sections of continuous sub-borehole tracks D n by any two adjacent geological target points T n and T n+1, wherein n is an integer greater than or equal to 1; sequentially optimizing and determining the positions of geological target points T n of all sub-wellbore tracks according to the sequence of Tn, tn+1, tn+2 and Tn+3 … …; respectively determining the horizontal projection azimuth of each sub-well hole track positioned in the inner area of the target oil reservoir; the azimuth change rate of each sub-wellbore trajectory located in an outer region of the target reservoir is determined separately.
Specifically, as shown in fig. 3, according to factors such as formation structure, formation yield, sand development, and petroleum development requirements, the wellhead coordinate position and the positions of a plurality of geological target points T n in the target geological interval are determined, alternatively, 6 geological target points may be taken and respectively named as T 1、T2、T3、T4、T5 and T 6, the geological target points may be located in the same fault or different faults, and the wellbore trajectory design software uses the geological target points T 1、T2、T3、T4、T5 and T 6 to initially design the wellbore trajectory. Wherein, T 1、T2、T3、T4、T5 and T 6 divide the borehole trajectory of the target geological interval into five segments ：T1-T2、T2-T3、T3-T4、T4-T5、T5-T6, to adjust the parameter plane positions of geological target points T 1、T2、T3、T4、T5 and T 6 segment by segment.
In some alternative embodiments, the step of optimally determining the location of each sub-wellbore trajectory geological target T n comprises: determining plane position parameters of two geological target points T n and T n+1 of the sub-wellbore trajectory D n; plane position parameters of T n+2 in the sub-wellbore trajectory D n+1 are determined from the geological target point T n+1.
Specifically, n is 1, the plane position parameters of two geological target points T 1 and T 2 of the sub-wellbore trajectory D 1 are first determined, the plane position parameter of T 3 in the sub-wellbore trajectory D 2 is then determined according to the geological target point T 2, the plane position parameter of T 4 in the sub-wellbore trajectory D 3 is then determined according to the geological target point T 3, the plane position parameter of T 5 in the sub-wellbore trajectory D 4 is then determined according to the geological target point T 4, and the plane position parameter of T 6 in the sub-wellbore trajectory D 5 is then determined according to the geological target point T 5. T 1、T4 and T 5 are located at one fault of the target geologic formation and T 2、T3 and T 6 are located at another fault of the target geologic formation.
In some alternative embodiments, the step of determining two geological target points T n and T n+1 for each sub-wellbore trajectory D n comprises: a determination is made as to whether the locations of the geological target points of each of the sub-wellbore tracks D n are located at the same fault.
In some alternative embodiments, the step of determining whether two adjacent geological target locations of each sub-wellbore trajectory D n are at the same fault comprises: and determining that the positions of two adjacent geological target points of each sub-borehole track D n are not positioned on the same fault, determining that an included angle beta between a connecting line of two geological target points T n and T n+1 and a minimum main stress azimuth sigma h of the sub-borehole track D n is positioned within (+/-) (0.5θ+6) °, otherwise, adjusting the position of at least one of the geological target points T n and T n+1 until the included angle between the connecting line of the geological target points T n and T n+1 and the minimum main stress azimuth sigma h is positioned within (+/-) (0.5θ+6) °. The step of determining whether the locations of the geological target points of each sub-wellbore trajectory D n are located at the same fault further comprises: determining that the positions of the geological target points of all the sub-borehole tracks D n are located on the same fault, and determining that the azimuth change rate K φ of the sub-borehole tracks of the geological target points T n+1 and T n+2 meets a preset value, otherwise, adjusting the positions of the geological target points T n+1 until the azimuth change rates K φ of the sub-borehole tracks of the geological target points T n+1 and T n+2 meet the preset value, wherein K φ refers to the speed of well inclination azimuth changes along with well depth.
Specifically, the horizontal projection azimuth of the sub-wellbore orbit D 1 is judged, the maximum principal stress azimuth sigma H and the minimum principal stress azimuth sigma h of the sub-wellbore orbit D 1 are determined according to the fault trend of the target geological layer, the azimuth perpendicular to sigma H is the horizontal projection azimuth of the inner area of the target reservoir where the complete wellbore orbit of the optimal target interval is located according to the principle that the crack expands towards the minimum energy loss direction, and if the horizontal projection azimuth of the orbit cannot be perpendicular to sigma H, the maximum included angle between the horizontal projection azimuth of the inner area of the target reservoir where the whole wellbore orbit of the target geological layer is located and sigma h is determined to be ± (0.5θ+6) ° according to the difference θ between the maximum principal stress azimuth sigma H and the minimum principal stress azimuth sigma h.
Further, as shown in fig. 3, it is first determined whether the included angle β between the line of the connecting line of the geological target points T 1 and T 2 and σ h is within ± (0.5θ+6) °, if not, it is necessary to adjust T 1 in the direction of T 11, or adjust T 2 in the direction of T 21, or adjust T 1 in the direction of T 11 and T 2 in the direction of T 21 simultaneously until the included angle β between the line of the connecting line of T 1 and T 2 and σ h is within ± (0.5θ+6) °.
Specifically, after the planar positions of T 1 and T 2 in sub-wellbore trajectory D 1 are determined, the planar position parameters of geological target point T 3 in sub-wellbore trajectory D 2 are adjusted. Whether the azimuth change rate K φ of the borehole trajectory between the geological target points T 2 and T 3 meets the tool slope requirement is judged. K φ refers to the speed of the change of the well inclination azimuth along with the well depth, and can be expressed by the ratio of the well inclination azimuth change value (delta φ) between two adjacent measuring points to the well section length (delta L) between the two measuring points. According to FIG. 4, the well inclination azimuth angles phi b and phi c of the geological target points T 2 and T 3 are determined, K φ is calculated, and if K φ is greater than the tool slope, T 3 needs to be adjusted towards T 31 (as shown in FIG. 4) until K φ meets the tool slope requirement.
Further, after determining the plane position of the geological target point T 3 in the sub-wellbore track D 2, adjusting the plane position parameter of the geological target point T 4 in the sub-wellbore track D 3, as shown in fig. 5, first determining whether the included angle β between the line of the connecting line of the geological target point T 3 and T 4 and σ h is within ± (0.5θ+6) °, if not, adjusting the T 4 toward the direction of T 41 until the included angle β between the line of the connecting line of the T 3 and T 4 and σ h is within ± (0.5θ+6) °.
Further, after the plane position of the geological target T 4 in the sub-wellbore trajectory D 3 is determined, the plane position parameters of the geological target T 5 in the sub-wellbore trajectory D 4 are adjusted. Whether the azimuth change rate K φ of the borehole trajectory between the geological target points T 4 and T 5 meets the tool slope requirement is judged. K φ refers to the speed of the change of the well inclination azimuth along with the well depth, and can be expressed by the ratio of the well inclination azimuth change value (delta φ) between two adjacent measuring points to the well section length (delta L) between the two measuring points. According to FIG. 6, the well inclination azimuths phi b and phi c of the geological target points T 4 and T 5 are determined, K φ is calculated, and if K φ is greater than the tool slope, T 5 needs to be adjusted towards T 51 until K φ meets the tool slope requirement.
Further, after the plane position of the geological target T 5 in the sub-wellbore trajectory D 4 is determined, the plane position parameters of the geological target T 6 in the sub-wellbore trajectory D 5 are adjusted. As shown in fig. 7, it is determined whether the included angle β between the line of the connecting line of the geological target points T 5 and T 6 and σ h is within ± (0.5θ+6) °, if not, T 6 needs to be adjusted toward the direction of T 61 until the included angle β between the line of the connecting line of T 6 and T 61 and σ h is within ± (0.5θ+6) °.
In some alternative embodiments, the complete wellbore trajectory geologic parameters include at least a horizontal wellhead coordinate location, a plurality of geologic target point coordinate locations, and a vertical depth parameter of the coordinate points.
Specifically, as shown by the broken lines in fig. 8 and 9, the preliminary design of the wellbore trajectory is completed by the wellbore trajectory design software using the wellhead position coordinates, the position coordinates of the six geological target points mentioned above, and the coordinate point sag parameters. On the basis of completing the primary design of the well track, engineering requirements are considered under the condition of meeting the control requirement of drilling and encountering a reservoir, the target point parameters are readjusted according to the method for adjusting the geological target point (T 1、T2、T3、T4、T5、T6), and the adjusted geological target point is as T 11、T21、T31、T41、T51、T61. And taking the geological parameters of the redetermined geological target point (T 11、T21、T31、T41、T51、T61) as final geological target point parameters, completing the complete borehole trajectory design through the borehole trajectory design software, and further optimizing the borehole trajectory design parameters to obtain a final borehole trajectory design scheme (the borehole trajectory shown by the solid line in fig. 9) in order to ensure the borehole trajectory smoothness, reduce the drilling construction difficulty, improve the drilling construction efficiency.
Further, the horizontal projection of the final target interval wellbore trajectory is "S-shaped". The target interval wellbore trajectory consists of T1-T2、T2-T3、T3-T4、T4-T5、T5-T6 sections, with three sections T 1-T2、T3-T4、T5-T6 located inside the reservoir between faults. T 2-T3 and T 4-T5 are located outside the reservoir and belong to the azimuth adjustment section of the target interval borehole trajectory. The target interval well track has three sections positioned in the oil reservoir, so that the length of the horizontal section is increased, the drilling rate of the oil reservoir can be obviously improved, the single well oil drainage area is enlarged, and the low input and high output of the complex fault block oil reservoir are realized.
In another aspect, embodiments of the present invention provide a horizontal well, where the complete wellbore trajectory is determined by the method of designing a wellbore trajectory as mentioned above in any of the above locations.
In some alternative embodiments, the horizontal projection of the horizontal well target geological interval wellbore trajectory is "S-shaped" comprising five of the sub-wellbore trajectories, wherein three of the sub-wellbore trajectories are located in an interior region of the target reservoir and two of the sub-wellbore trajectories are located in an exterior region of the target reservoir.
Specifically, the horizontal projection of the complete wellbore track of the target geological interval is in an S shape, the determined wellbore track of the target interval consists of five sections of sub-wellbore tracks, wherein three sections are positioned in an oil reservoir between two adjacent faults, the length of the horizontal section is increased, and the other two sections are positioned outside the oil reservoir area, namely, the two sub-wellbore tracks do not enter the target oil reservoir area and belong to the azimuth adjustment section of the wellbore track of the target interval.
For example, according to the well logging interpretation of the old well X-MAC well being completely drilled, the maximum horizontal principal stress azimuth of the objective interval is between 55 DEG to 65 DEG in the North east and is basically consistent with the direction of spread of the principal fault in the well being 50 DEG to 70 DEG, so that the maximum principal stress sigma H and the minimum principal stress azimuth sigma h are determined to be 55 DEG to 65 DEG in the North east and 145 DEG to 155 DEG in the North east, respectively. According to the well region horizontal maximum and minimum main stress difference value less than 10MPa, determining that the maximum included angle between the horizontal optimal azimuth of the well hole track and sigma h is +/-15 degrees, namely 130-170 degrees in north east. The determined optimal azimuth of the well track, the formation attitude and the construction characteristics, a preliminary scheme of wellhead position coordinates and six target point position coordinates are determined, and the wellhead position coordinates are as follows: 491080m, north-south: 4216100m, the target point position coordinates are shown in table 1 below.
TABLE 1
According to wellhead position coordinates and target point coordinates provided by geological design, the wellbore orbit design software is utilized to finish the preliminary design of the wellbore orbit, and the plane position parameters of the target point T 1、T2、T3、T4、T5、T6 are adjusted section by section. The adjusted borehole trajectory design is shown in solid lines in FIG. 10, and the adjusted target point parameters are shown in Table 2.
TABLE 2
The target point parameters are determined. The wellbore trajectory planning software is applied to form a preliminary wellbore trajectory plan (shown by the dashed line in fig. 11), wherein the wellbore trajectory from the target point T 11 to the bottom of the well is the desired interval wellbore trajectory plan, and the specific design parameters are shown in table 3.
TABLE 3 Table 3
In order to reduce the control difficulty of the drilling construction track, the full angle change rate of the target geological interval is adjusted and optimized. The rate of change of the full angle between target points T 21 and T 31 was optimized from 7.32/30 m to 6.803/30 m, the rate of change of the full angle between T 31 and T 41 was optimized from 8.345 DEG 3/30m to 3.00/30 m, the rate of change of the full angle between T 41 and T 51 was optimized from 9.688/30 m to 9.3/30 m, and the rate of change of the full angle between T 51 and T 61 was optimized from 6.094/30 m to 3.00/30 m, resulting in a final wellbore trajectory design (as shown in solid lines in FIG. 11), with specific design parameters as set forth in Table 4.
TABLE 4 Table 4
In addition, the term "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that in embodiments of the present invention, "B corresponding to a" means that B is associated with a, from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the invention is subject to the protection scope of the claims.

Claims (7)

1. A method of designing a wellbore trajectory, comprising the steps of:
Determining the dominant orientation of the crack development of the target geological interval;
Determining the horizontal projection azimuth of the complete wellbore orbit of the target geological interval in the target oil reservoir;
Determining plane position parameters of each geological target point in the target geological interval; comprising the following steps: determining a wellhead coordinate position; determining the positions of a plurality of geological target points T n in a target geological interval, dividing the whole borehole track into a plurality of sections of continuous sub-borehole tracks D n by any two adjacent geological target points T n and T n+1, wherein n is an integer greater than or equal to 1; sequentially optimizing and determining the positions of geological target points T n of all sub-borehole tracks according to the sequence of T n、Tn+1、Tn+2、Tn+3 … …; respectively determining the horizontal projection azimuth of each sub-well hole track positioned in the inner area of the target oil reservoir; determining azimuth change rates of all sub-wellbore tracks located in an outer region of a target reservoir respectively; wherein the optimizing step of determining the position of each sub-wellbore orbit geological target point T n comprises the following steps: determining plane position parameters of two geological target points T n and T n+1 of each sub-wellbore trajectory D n; determining a plane position parameter of T n+2 in the sub-wellbore trajectory D n+1 according to the geological target point T n+1; the step of determining two geological target points T n and T n+1 for each sub-wellbore trajectory D n includes determining whether the geological target points for each sub-wellbore trajectory D n are located at the same fault; the step of determining whether the geological target points of the respective sub-wellbore tracks Dn are located at the same fault comprises: determining that the positions of the geological target points of all the sub-borehole tracks Dn are not located in the same fault, determining that an included angle beta between a connecting line of two geological target points Tn and Tn+1 of the sub-borehole tracks Dn and a minimum principal stress azimuth sigma h is within (+/-) (0.5θ+6) °, otherwise, adjusting the position of at least one of the geological target points Tn and Tn+1 until the included angle between the connecting line of the geological target points Tn and Tn+1 and the minimum principal stress azimuth sigma h is within (+/-) (0.5θ+6) °; wherein θ is the difference θ between the maximum principal stress azimuth σ H and the minimum principal stress azimuth σ h;
Optimizing plane position parameters and borehole orbit design parameters of each geological target point in the target geological interval;
geological parameters of the complete wellbore trajectory are determined.
2. The method of designing a wellbore trajectory according to claim 1, wherein the step of determining a dominant bearing of target geological interval fracture development comprises:
the maximum principal stress location σ H and the minimum principal stress location σ h of the target geologic interval are determined.
3. The method of claim 1 or 2, wherein determining the horizontal projected orientation of the complete wellbore trajectory of the target geologic interval into the target reservoir comprises:
determining a azimuth sigma H perpendicular to the maximum principal stress as a horizontal projection azimuth of the whole borehole trajectory of the target geological interval;
Or alternatively
And determining the maximum included angle between the horizontal projection azimuth of the whole borehole orbit of the target geological interval and sigma h as plus or minus (0.5θ+6) ° by the difference θ between the maximum main stress azimuth sigma H and the minimum main stress azimuth sigma h.
4. The method of designing a wellbore trajectory according to claim 1, wherein the step of determining whether the geological target points of the respective sub-wellbore trajectories Dn are located at the same fault further comprises:
Determining that the geological target points of all the sub-borehole orbits Dn are located on the same fault, and determining that the azimuth change rate K ϕ of the sub-borehole orbits of the geological target points Tn+1 and Tn+2 meets a preset value, otherwise, adjusting the position of the geological target point Tn+1 until the azimuth change rate K ϕ of the sub-borehole orbits of the geological target points Tn+1 and T n +2 meets the preset value, wherein K ϕ refers to the speed of well inclination azimuth change along with well depth.
5. The method of claim 4, wherein the complete wellbore trajectory geologic parameters comprise at least a horizontal wellhead coordinate location, a plurality of geologic target point coordinate locations, and a vertical depth parameter of a coordinate point.
6. A horizontal well, characterized in that the complete borehole trajectory of the horizontal well is determined by the method of designing a borehole trajectory according to any one of claims 1-5.
7. The horizontal well of claim 6, wherein the horizontal projection of the horizontal well target geologic interval wellbore trajectory is "S-shaped" comprising five of the sub-wellbore trajectories, wherein three of the sub-wellbore trajectories are located in an interior region of the target reservoir and two of the sub-wellbore trajectories are located in an exterior region of the target reservoir.
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