CN111379548A - Method, device and equipment for determining well track and storage medium - Google Patents
Method, device and equipment for determining well track and storage medium Download PDFInfo
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Abstract
The invention discloses a method, a device, equipment and a storage medium for determining a borehole trajectory, which can determine an optimal borehole trajectory result by obtaining the ground stress distribution and the fracturing index distribution of a target block, adjusting the first target point coordinate in the current target area according to the ground stress distribution and the fracturing index distribution to obtain a second target point coordinate expected to realize the maximum productivity, obtaining the plane ground stress difference distribution of the target block according to the ground stress distribution, determining the position of a well head according to the plane ground stress difference distribution and the displacement before the target, selecting a deflecting point, determining the borehole trajectory parameters of each interval below the deflecting point, which are most beneficial to ensuring the stability of a borehole wall, and determining the optimal borehole trajectory result according to the second target point coordinate, the position of the well head, the deflecting point and the borehole trajectory parameters of each interval, thereby realizing the maximum productivity after oil layer fracturing, and the stability of the well wall of the lower layer section below the deflecting point in the drilling process can be guaranteed, and the exploration and development of petroleum are facilitated.
Description
Technical Field
The invention relates to the technical field of petroleum exploration and development, in particular to a method, a device, equipment and a storage medium for determining a borehole trajectory.
Background
In the oil drilling process, the determination of the well track has very important position and role. The determination of the well track influences the selection of well drilling tools, processes and construction parameters and the finally obtained capacity. If the well track is determined improperly, the difficulty of drilling construction is increased, the drilling period is prolonged, the complex risk of accidents is increased, and the productivity is lower than the expected value.
The traditional method for determining the well track is generally to directly determine the well track according to a target point and well mouth coordinates given in the geological aspect, usually only the difficulty degree of construction is considered, and the problems that the well wall stability is poor in the drilling process, the later-stage test oil blowout yield is not ideal and the like are caused because the position of the target point and whether well track parameters meet the requirements of capacity maximization and engineering drilling on other aspects such as well wall stability and the like are not re-demonstrated and further analyzed.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method, an apparatus, a device, and a storage medium for determining a borehole trajectory, so as to meet engineering requirements related to capacity maximization and borehole wall stability during a drilling process.
In a first aspect, an embodiment of the present invention provides a method for determining a wellbore trajectory, including:
acquiring the ground stress distribution and the fracturing index distribution of a target block;
adjusting the coordinates of a first target point in the current target area according to the ground stress distribution and the fracturability index distribution to obtain the coordinates of a second target point;
obtaining plane ground stress difference distribution of the target block according to the ground stress distribution, wherein the plane ground stress difference is a difference value between the horizontal maximum main stress and the horizontal minimum main stress in the ground stress distribution;
determining the position of a wellhead according to the plane ground stress difference distribution and the displacement before the target;
selecting a deflecting point, and determining well track parameters of each layer section below the deflecting point;
and determining a borehole track result according to the second target point coordinate, the wellhead position, the deflecting point and the borehole track parameters of each interval.
In a possible implementation manner, in the method provided by an embodiment of the present invention, the obtaining a ground stress distribution and a fracability index distribution of the target block specifically includes:
calculating the ground stress and the fracability index near the single well according to the logging data of the single well drilled in the target block;
and obtaining the crustal stress distribution and the fracturing index distribution of the target block according to the seismic data of the target block, the crustal stress size and the fracturing index.
In a possible implementation manner, in the foregoing method provided in an embodiment of the present invention, the adjusting the coordinates of the first target point in the current target area according to the ground stress distribution and the fracturability index distribution to obtain the coordinates of the second target point specifically includes:
selecting a coordinate point in the target area, wherein the horizontal minimum principal stress value in the ground stress distribution is less than or equal to a first preset standard, and the fracability index value in the fracability index distribution is greater than or equal to a second preset standard;
and taking the coordinate point as the second target point coordinate.
In a possible implementation manner, in the foregoing method provided by an embodiment of the present invention, the determining a wellhead position according to the planar ground stress difference distribution in combination with the target forward displacement specifically includes:
selecting a first position of the plane ground stress difference distribution, wherein the plane ground stress difference is less than or equal to a third preset standard;
and determining the distance from the first position to a second position of the displacement in front of the target as the wellhead position.
In one possible implementation, the method provided by the embodiment of the present invention includes the wellbore trajectory parameters including a well depth, a well inclination angle and a well inclination azimuth angle.
In a possible implementation manner, in the method provided in this embodiment, the selecting a kick-off point, and determining wellbore trajectory parameters of each of the following intervals of the kick-off point specifically include:
selecting depth points in the layer section with the average Young modulus larger than a preset modulus threshold value and the thickness larger than a preset thickness threshold value as deflecting points;
calculating collapse pressure of each interval below the deflecting point under different well deflection angles according to geological stratification;
and selecting a well deviation angle with the collapse pressure less than or equal to a fourth preset standard, and the corresponding well depth and well deviation azimuth angle as well trajectory parameters of each interval.
In a second aspect, an embodiment of the present invention provides an apparatus for determining a borehole trajectory, including:
the first acquisition module is used for acquiring the crustal stress distribution and the fracturing index distribution of the target block;
the target point adjusting module is used for adjusting the coordinates of a first target point in the current target area according to the ground stress distribution and the fracturability index distribution to obtain the coordinates of a second target point;
the second acquisition module is used for acquiring plane ground stress difference distribution of the target block according to the ground stress distribution, wherein the plane ground stress difference is a difference value between the horizontal maximum main stress and the horizontal minimum main stress in the ground stress distribution;
the wellhead determining module is used for determining the wellhead position according to the plane ground stress difference distribution and the target front displacement;
the parameter determination module is used for selecting a deflecting point and determining well track parameters of each interval below the deflecting point;
and the track determining module is used for determining a borehole track result according to the second target point coordinate, the wellhead position, the deflecting point and the borehole track parameters of each interval.
In a possible implementation manner, in the apparatus provided in an embodiment of the present invention, the first obtaining module is specifically configured to calculate, according to well logging data of a single well drilled in the target block, a geostress magnitude and a fracability index near the single well; and obtaining the crustal stress distribution and the fracturing index distribution of the target block according to the seismic data of the target block, the crustal stress size and the fracturing index.
In a possible implementation manner, in the apparatus provided in an embodiment of the present invention, the target point adjusting module is specifically configured to select a coordinate point in the target area, where a horizontal minimum principal stress value in the ground stress distribution is less than or equal to a first preset standard, and a fracability index value in the fracability index distribution is greater than or equal to a second preset standard; and taking the coordinate point as the second target point coordinate.
In a possible implementation manner, in the apparatus provided in an embodiment of the present invention, the wellhead determining module is specifically configured to select a first position where a plane ground stress difference value in the plane ground stress difference distribution is less than or equal to a third preset standard; and determining the distance from the first position to a second position of the displacement in front of the target as the wellhead position.
In one possible implementation, the above apparatus provided by the embodiment of the present invention, the wellbore trajectory parameters include a well depth, a well inclination angle and a well inclination azimuth angle.
In a possible implementation manner, in the foregoing method provided in an embodiment of the present invention, the parameter determining module includes:
the selecting unit is used for selecting depth points in the layer section with the average Young modulus larger than a preset modulus threshold value and the thickness larger than a preset thickness threshold value as deflecting points;
the calculation unit is used for calculating collapse pressures of different well angles of each interval below the deflecting point according to geological stratification;
and the determining unit is used for selecting the well deviation angle with the collapse pressure less than or equal to the fourth preset standard and the corresponding well depth and well deviation azimuth angle as well track parameters of each interval.
In a third aspect, an embodiment of the present invention provides an electronic device, including: a memory, a processor, and a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of the first aspect.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, the program being executed by a processor to implement the method in the first aspect.
The method, the device, the equipment and the storage medium for determining the well track can determine the optimal well track result by acquiring the ground stress distribution and the fracturing index distribution of a target block, adjusting the first target point coordinate in the current target area according to the ground stress distribution and the fracturing index distribution to obtain the second target point coordinate expected to realize the maximization of the productivity, obtaining the plane ground stress difference distribution of the target block according to the ground stress distribution, determining the well head position according to the plane ground stress difference distribution and the displacement before the target, selecting the deflecting point, determining the well track parameter which is most favorable for ensuring the stability of the well wall of each layer below the deflecting point, determining the optimal well track result according to the second target point coordinate, the well head position, the deflecting point and the well track parameter of each layer, and realizing the maximization of the productivity after the fracturing construction of an oil layer by the scheme, and the stability of the well wall of the lower layer section below the deflecting point in the drilling process can be guaranteed, and the exploration and development of petroleum are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic flow chart of a method for determining a borehole trajectory according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for determining a borehole trajectory according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a borehole trajectory determination device according to a third embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and the embodiments of the present invention are illustrative only and are not intended to limit the scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, and in the above-described drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Example one
Fig. 1 is a schematic flow chart of a method for determining a borehole trajectory according to an embodiment of the present invention, and as shown in fig. 1, an implementation subject of the embodiment of the present invention is a device for determining a borehole trajectory. In practical applications, the device for determining the wellbore trajectory may be implemented by a virtual device, such as software code, or by a physical device written with relevant execution code, such as a usb flash disk, or by a physical device integrated with relevant execution code, such as a chip, a smart terminal, or the like. For example, the following description will be made of an apparatus for determining a trajectory of a wellbore, which is an execution subject. The method for determining the borehole trajectory provided by the embodiment comprises the following steps:
s101, acquiring the crustal stress distribution and the fracturing index distribution of the target block.
In practical application, for a low-pore and low-permeability compact reservoir, the higher capacity can be obtained only by fracturing modification. And the formation of a complex seam network by extending and expanding the cracks in the fracturing construction process is more facilitated in the weak ground stress area and the area with high fracturable index, so that the maximization of the production energy is realized. Therefore, in this embodiment, first, the geostress distribution and the fracability index distribution of the target block are obtained, according to an embodiment of the present invention, the geostress distribution and the fracability index distribution of the target block may be obtained by calculating from the well log data and the seismic data of the drilled single well in the target block, or may be obtained by other methods, which is not limited herein.
S102, adjusting the coordinates of the first target point in the current target area according to the ground stress distribution and the fracturability index distribution to obtain the coordinates of the second target point.
In practical application, through analysis of ground stress distribution and fracturability index distribution, a second target point coordinate which is more beneficial to fracture expansion and extension in a fracturing construction process to form a complex fracture network in a current target area corresponding to a target block can be obtained, and therefore, in order to achieve maximization of productivity, a first target point coordinate determined according to an existing method can be adjusted to be the second target point coordinate.
S103, obtaining plane ground stress difference distribution of the target block according to the ground stress distribution, wherein the plane ground stress difference is a difference value between the horizontal maximum main stress and the horizontal minimum main stress in the ground stress distribution.
In practical application, the smaller the plane ground stress difference is, the more favorable the stability of the well wall of the well is, so that the azimuth drilling with the smaller ground stress difference value can be selected, and before the position of a drilling well head is determined, the plane ground stress difference distribution of a target block can be obtained according to the difference value between the horizontal maximum main stress and the horizontal minimum main stress in the ground stress distribution.
And S104, determining the position of a wellhead according to the plane ground stress difference distribution and the displacement before the target.
In practical application, the wellhead position which is beneficial to the stability of the well wall of the well can be determined by combining the planar ground stress difference distribution and the displacement before the target.
S105, selecting a deflecting point, and determining well track parameters of each interval below the deflecting point.
In practical application, the deflecting point can be selected according to the average Young's modulus and thickness of the depth point of the interval. According to an embodiment of the present invention, the borehole trajectory parameters include a borehole depth, a borehole angle, and a borehole inclination azimuth, and the borehole inclination which is most favorable for ensuring the borehole wall stability, and the corresponding borehole depth and borehole inclination azimuth may be determined according to the calculation result of the collapse pressures of different borehole inclinations of different intervals below the kick-off point, or may be determined in other manners, which is not limited herein.
And S106, determining a borehole track result according to the second target point coordinate, the wellhead position, the deflecting point and the borehole track parameters of each interval.
In practical application, an optimal borehole trajectory can be determined according to the determined second target point coordinates, the well head position, the deflecting point and the borehole trajectory parameters of each interval.
The method for determining the borehole trajectory provided by the embodiment comprises the steps of obtaining the crustal stress distribution and the fracability index distribution of the target block, adjusting the coordinates of the first target point in the current target area according to the distribution of the ground stress and the distribution of the fracturability index to obtain the coordinates of the second target point expected to realize the maximum productivity, determining the position of a well head according to the plane ground stress difference distribution and the displacement before the target, selecting a deflecting point, determining well track parameters of each layer section below the deflecting point which are most beneficial to ensuring the stability of the well wall, according to the second target point coordinate, the well mouth position, the deflecting point and the well track parameters of each interval, the optimal well track can be determined, the production capacity after the oil layer fracturing construction is maximized through the scheme, and the stability of the well wall of the lower layer section below the deflecting point in the drilling process can be guaranteed, and the exploration and development of petroleum are facilitated.
Example two
Fig. 2 is a schematic flow chart of a method for determining a borehole trajectory according to a second embodiment of the present invention, and based on the first embodiment, as shown in fig. 2, the method for determining a borehole trajectory according to the present embodiment includes the following steps:
s201, calculating the ground stress and the fracturing index near the single well according to the logging data of the single well drilled in the target block.
Specifically, integral calculation is carried out according to the density logging curve of the single well and the depth of the measuring point to obtain the vertical stress sigma of the stratumvThe magnitude, integral calculation formula is as follows:
where ρ (Z) represents the density log and Z represents the survey point depth.
According to the acoustic longitudinal wave velocity V in the acoustic logging curve of the single wellpAnd the transverse wave velocity V of the sound wavesObtaining the magnitudes of the Poisson ratio v and the Young modulus E by a relational expression of the Poisson ratio v and the Young modulus E:
according to horizontal minimum principal stress σhTo poisson's ratio v and pore pressure PpRelation of the Biott coefficient α determines the horizontal minimum principal stress σhThe size of (2):
according to the ground breaking experiment, the method can obtainTo formation fracture pressure PfAnd according to the horizontal maximum principal stress σHWith horizontal minimum principal stress σhPore pressure PpRelation of the Biott coefficient α determines the horizontal maximum principal stress σHThe size of (2): sigmaH＝3σh-Pf-αPp。
According to the brittleness index BIDetermining B by a relation between Young's modulus E and Poisson's ratio vIThe size of (2):
in the formula EmaxAnd EminThe maximum value and the minimum value of the Young modulus in the block are respectively; upsilon ismaxAnd upsilonminRespectively, the maximum and minimum values of poisson's ratio within the block.
The tensile strength S of the rock at the interval of the research is obtained according to the rock mechanics experimenttAccording to the tensile strength StFracture toughness of rock under zero confining pressure
Is determined by the relation of
The distribution of (c):
according to the fracture toughness K of the rockICFracture toughness of rock under zero confining pressure
And confining pressure PwDetermining the fracture toughness K of the rockICThe size of (2):
according to the fracability index FIBrittleness index B normalized to the ForwardInAnd reverse normalized fracture toughness KIC_nDetermining a fracability index FI：
In the formula: b isImaxAnd BIminRespectively the maximum value and the minimum value of the brittleness index in the block; kIC_maxAnd KIC_minThe maximum and minimum fracture toughness values within the block are provided.
S202, according to the seismic data of the target block, the crustal stress size and the fracturing index, crustal stress distribution and fracturing index distribution of the target block are obtained.
In practical application, the magnitude of the crustal stress and the fracturing index obtained by the calculation can be combined with the seismic data of the target block, so that the crustal stress distribution and the fracturing index distribution of the target block can be obtained.
And S203, selecting a coordinate point in the target area, wherein the horizontal minimum principal stress value in the crustal stress distribution is less than or equal to a first preset standard, and the fracability index value in the fracability index distribution is greater than or equal to a second preset standard. And taking the coordinate point as the second target point coordinate.
In particular, can define
The method comprises the steps of determining whether the horizontal minimum principal stress value is a first preset standard of a lower value. When in use
The horizontal minimum principal stress value is considered to be lower,
the calculation formula of (a) is as follows:
wherein σhmaxAnd σhminRespectively, the maximum and minimum values of the horizontal minimum principal stress within the target block.
Can also define
A second predetermined criterion for determining whether the fracability index value is a higher value. When in use
The fracability index is considered to be higher,
the calculation formula of (a) is as follows:
wherein, FImaxAnd FIminThe maximum and minimum fracability indices within a block, respectively.
For example, for a certain block of KES10-1 well to be drilled, the stratigraphic division is known, as shown in Table 1, the target layer is the stratum 10, and the target point position is given, then after the target point position is re-determined according to the method for determining the well track, the target point position of the KES10-1 well is moved 0.8km towards 230 degrees in the southwest direction, and in practical application, the feasibility of implementing a new target point position in units related to exploration geology and the like can also be realized.
Table 1: KES10-1 geological stratification sheet
| Geological stratification | Bottom well depth (m) | Thickness (m) |
| Formation 1 | 520 | 520 |
| Formation 2 | 600 | 80 |
| Formation 3 | 850 | 150 |
| Formation 4 | 1600 | 750 |
| Formation 5 | 2230 | 730 |
| Formation 6 | 2500 | 270 |
| Formation 7 | 4900 | 2400 |
| Formation 8 | 6430 | 1530 |
| Formation 9 | 6520 | 50 |
| Formation 10 | 6570 | 50 |
S204, selecting a first position of the plane ground stress difference value in the plane ground stress difference distribution, wherein the plane ground stress difference value is smaller than or equal to a third preset standard.
In particular, plane ground stress difference
Is the difference between the horizontal maximum principal stress and the minimum principal stress, then,
can define
And a third preset standard for judging whether the plane ground stress difference is a lower value. When in use
The planar ground stress difference is considered to be lower,
the calculation formula of (a) is as follows:
wherein the content of the first and second substances,
and
the maximum and minimum values of the in-plane ground stress difference within the block, respectively.
S205, determining the distance from the first position to a second position of the displacement before the target as a wellhead position.
For example, the KES10-1 well target front displacement is 400m, and the wellhead position is located in the 320 North-West direction of the new target position according to the principle and the plane ground stress difference distribution.
S206, selecting depth points in the interval with the average Young modulus larger than a preset modulus threshold value and the thickness larger than a preset thickness threshold value as deflecting points.
Specifically, a depth point in the interval with the average young's modulus larger than the preset modulus threshold value of 40GPa and the thickness exceeding the preset thickness threshold value of 100m can be selected as a deflecting point.
And S207, calculating collapse pressures of different well angles of each interval below the deflecting point according to geological stratification. And selecting a well deviation angle with the collapse pressure less than or equal to a fourth preset standard, and the corresponding well depth and well deviation azimuth angle as well trajectory parameters of each interval.
In particular, can define
And judging whether the collapse pressure of different intervals under different well angles is a fourth preset standard of a lower value. When in use
The collapse pressure is considered to be lower when the pressure is lower,
the calculation formula of (a) is as follows:
wherein, PCmaxAnd PCminRespectively, the maximum value and the minimum value of collapse pressure at different well angles.
For example, the KES10-1 well formation 8 collapse pressure is lower at well deviation less than 30 deg., and the drilling fluid density required to maintain the well wall is 1.5-1.55g/cm3. The collapse pressure of the stratum 9 is smaller when the well deviation is more than 45 degrees, and the density of the drilling fluid required by the well wall is maintained to be 1.98-1.985g/cm3. The collapse pressure of the stratum 10 is smaller when the well deviation is more than 50 degrees, and the density of the drilling fluid required for maintaining the well wall is 1.73-1.74g/cm3. In summary, the following intervals with the deflecting points are selected to have the well deflection angles shown in the following table 2:
| layer segment | Well angle |
| Formation 8 | ≤30° |
| Formation 9 | ≥45° |
| Formation 10 | ≥50° |
And S208, determining a borehole track result according to the second target point coordinate, the wellhead position, the deflecting point and the borehole track parameters of each interval.
Specifically, through the above steps, the results of determining the well trajectory for the KES10-1 well are shown in table 3 below:
the method for determining the borehole trajectory provided by the embodiment comprises the steps of obtaining the crustal stress distribution and the fracability index distribution of the target block, adjusting the coordinates of the first target point in the current target area according to the distribution of the ground stress and the distribution of the fracturability index to obtain the coordinates of the second target point expected to realize the maximum productivity, determining the position of a well head according to the plane ground stress difference distribution and the displacement before the target, selecting a deflecting point, determining well track parameters of each layer section below the deflecting point which are most beneficial to ensuring the stability of the well wall, according to the second target point coordinate, the well mouth position, the deflecting point and the well track parameters of each interval, the optimal well track can be determined, the production capacity after the oil layer fracturing construction is maximized through the scheme, and the stability of the well wall of the lower layer section below the deflecting point in the drilling process can be guaranteed, and the exploration and development of petroleum are facilitated.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
EXAMPLE III
Fig. 3 is a schematic structural diagram of a borehole trajectory determination apparatus according to a third embodiment of the present invention, and as shown in fig. 3, the apparatus includes:
the first obtaining module 310 is configured to obtain a geostress distribution and a fracability index distribution of the target block.
And the target point adjusting module 320 is configured to adjust a first target point coordinate in the current target area according to the ground stress distribution and the fracturability index distribution to obtain a second target point coordinate.
A second obtaining module 330, configured to obtain a planar ground stress difference distribution of the target block according to the ground stress distribution, where the planar ground stress difference is a difference between a horizontal maximum main stress and a horizontal minimum main stress in the ground stress distribution.
And the wellhead determining module 340 is used for determining the wellhead position according to the plane ground stress difference distribution and the target front displacement.
And the parameter determining module 350 is configured to select a kick-off point and determine wellbore trajectory parameters of each interval below the kick-off point.
And the track determining module 360 is configured to determine a wellbore track result according to the second target point coordinate, the wellhead position, the kick-off point, and the wellbore track parameters of each interval.
According to an embodiment of the present invention, the first obtaining module 310 is specifically configured to calculate a geostress magnitude and a fracability index near a single well drilled in the target block according to well logging data of the single well. And obtaining the crustal stress distribution and the fracturing index distribution of the target block according to the seismic data of the target block, the crustal stress size and the fracturing index.
According to an embodiment of the present invention, the target point adjusting module 320 is specifically configured to select, in the target area, a coordinate point in the distribution of the ground stress, where a horizontal minimum principal stress value is equal to or less than a first preset standard, and a fracability index value in the distribution of the fracability index is equal to or greater than a second preset standard. And taking the coordinate point as the second target point coordinate.
According to an embodiment of the present invention, the wellhead determining module 340 is specifically configured to select a first position in the plane ground stress difference distribution, where the plane ground stress difference is smaller than or equal to a third preset criterion. And determining the distance from the first position to a second position of the displacement in front of the target as the wellhead position.
According to one embodiment of the invention, the wellbore trajectory parameters include well depth, angle of inclination, and azimuth angle of inclination.
According to an embodiment of the present invention, the parameter determining module 350 includes:
the selecting unit 351 is used for selecting depth points in the interval with the average Young modulus larger than a preset modulus threshold value and the thickness larger than a preset thickness threshold value as deflecting points.
And the calculating unit 352 is used for calculating the collapse pressure of each interval below the deflecting point under different well angles according to the geological stratification.
The determining unit 353 is configured to select a well deviation angle with a collapse pressure less than or equal to a fourth preset standard, and a corresponding well depth and a corresponding well deviation azimuth angle as well trajectory parameters of each interval.
Example four
Fig. 4 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present invention, and as shown in fig. 4, the electronic device includes: memory 410, processor 420, and computer programs.
Wherein the computer program is stored in the memory 410 and configured to be executed by the processor 420 to implement the methods of the first and second embodiments.
EXAMPLE five
Fifth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the methods in the first and second embodiments.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, and is not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. A method of determining a wellbore trajectory, comprising:
acquiring the ground stress distribution and the fracturing index distribution of a target block;
adjusting the coordinates of a first target point in the current target area according to the ground stress distribution and the fracturability index distribution to obtain the coordinates of a second target point;
obtaining plane ground stress difference distribution of the target block according to the ground stress distribution, wherein the plane ground stress difference is a difference value between the horizontal maximum main stress and the horizontal minimum main stress in the ground stress distribution;
determining the position of a wellhead according to the plane ground stress difference distribution and the displacement before the target;
selecting a deflecting point, and determining well track parameters of each layer section below the deflecting point;
and determining a borehole track result according to the second target point coordinate, the wellhead position, the deflecting point and the borehole track parameters of each interval.
2. The method according to claim 1, wherein the obtaining of the geostress distribution and the fracturability index distribution of the target block specifically comprises:
calculating the ground stress and the fracability index near the single well according to the logging data of the single well drilled in the target block;
and obtaining the crustal stress distribution and the fracturing index distribution of the target block according to the seismic data of the target block, the crustal stress size and the fracturing index.
3. The method according to claim 1, wherein the adjusting the coordinates of the first target point in the current target area according to the ground stress distribution and the fracturability index distribution to obtain the coordinates of the second target point comprises:
selecting a coordinate point in the target area, wherein the horizontal minimum principal stress value in the ground stress distribution is less than or equal to a first preset standard, and the fracability index value in the fracability index distribution is greater than or equal to a second preset standard;
and taking the coordinate point as the second target point coordinate.
4. The method of claim 1, wherein determining a wellhead location from the planar ground stress difference distribution in combination with a pre-target displacement comprises:
selecting a first position of the plane ground stress difference distribution, wherein the plane ground stress difference is less than or equal to a third preset standard;
and determining the distance from the first position to a second position of the displacement in front of the target as the wellhead position.
5. The method of any one of claims 1-4, wherein the wellbore trajectory parameters comprise a well depth, a well angle, and a well deviation azimuth.
6. The method according to claim 5, wherein the selecting a kick-off point and determining wellbore trajectory parameters of intervals with the kick-off point comprises:
selecting depth points in the layer section with the average Young modulus larger than a preset modulus threshold value and the thickness larger than a preset thickness threshold value as deflecting points;
calculating collapse pressure of each interval below the deflecting point under different well deflection angles according to geological stratification;
and selecting a well deviation angle with the collapse pressure less than or equal to a fourth preset standard, and the corresponding well depth and well deviation azimuth angle as well trajectory parameters of each interval.
7. An apparatus for determining a trajectory of a wellbore, comprising:
the first acquisition module is used for acquiring the crustal stress distribution and the fracturing index distribution of the target block;
the target point adjusting module is used for adjusting the coordinates of a first target point in the current target area according to the ground stress distribution and the fracturability index distribution to obtain the coordinates of a second target point;
the second acquisition module is used for acquiring plane ground stress difference distribution of the target block according to the ground stress distribution, wherein the plane ground stress difference is a difference value between the horizontal maximum main stress and the horizontal minimum main stress in the ground stress distribution;
the wellhead determining module is used for determining the wellhead position according to the plane ground stress difference distribution and the target front displacement;
the parameter determination module is used for selecting a deflecting point and determining well track parameters of each interval below the deflecting point;
and the track determining module is used for determining a borehole track result according to the second target point coordinate, the wellhead position, the deflecting point and the borehole track parameters of each interval.
8. The apparatus of claim 7, wherein the first obtaining module is specifically configured to calculate, according to well logging information of a single well drilled in the target block, a geostress magnitude and a fracability index near the single well; and obtaining the crustal stress distribution and the fracturing index distribution of the target block according to the seismic data of the target block, the crustal stress size and the fracturing index.
9. The device according to claim 7, wherein the target point adjusting module is specifically configured to select, within the target area, a coordinate point in the distribution of the ground stress, where a horizontal minimum principal stress value is equal to or less than a first preset criterion, and a fracability index value in the distribution of the fracability index is equal to or greater than a second preset criterion; and taking the coordinate point as the second target point coordinate.
10. The device according to claim 7, wherein the wellhead determination module is specifically configured to select a first position in the plane ground stress difference distribution where the plane ground stress difference is less than or equal to a third preset criterion; and determining the distance from the first position to a second position of the displacement in front of the target as the wellhead position.
11. The apparatus of any of claims 7-10, wherein the wellbore trajectory parameters comprise a well depth, a well angle, and a well deviation azimuth.
12. The apparatus of claim 11, wherein the parameter determination module comprises:
the selecting unit is used for selecting depth points in the layer section with the average Young modulus larger than a preset modulus threshold value and the thickness larger than a preset thickness threshold value as deflecting points;
the calculation unit is used for calculating collapse pressures of different well angles of each interval below the deflecting point according to geological stratification;
and the determining unit is used for selecting the well deviation angle with the collapse pressure less than or equal to the fourth preset standard and the corresponding well depth and well deviation azimuth angle as well track parameters of each interval.
13. An electronic device, comprising: a memory, a processor, and a computer program;
wherein the computer program is stored in the memory and configured to be executed by the processor to implement the method of any one of claims 1-6.
14. A computer-readable storage medium, on which a computer program is stored, characterized in that the program is executed by a processor to implement the method according to any of claims 1-6.
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