CN109973079A - A kind of well head parameter determination method of J-type well - Google Patents
A kind of well head parameter determination method of J-type well Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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Abstract
The embodiment of the invention provides a kind of well head parameter determination methods of J-type well, include: that first target spot and second target spot of the two neighboring trap in seabed as J-type well are obtained by sound wave physical prospecting device, determines first target spot and the respective N axial coordinate of second target spot, E axial coordinate and depth；The build angle rate of J-type well and the length of steady tilted section are determined by the precision of deflecting tool；Hole angle is determined according to each axis difference and depth difference of second target spot and first target spot, and azimuth is determined according to each axis difference of first target spot and second target spot；Deflecting end point depth is determined according to above-mentioned value；Determine N axial coordinate, the E axial coordinate of deflecting end point；Determine N axial coordinate, the E axial coordinate of well head.The well head parameter determination method of the J-type well of the embodiment of the present invention, can double target spots, build angle rate, steady tilted section length restrictions under calculate mouth coordinate.
Description
Technical Field
The embodiment of the invention relates to the technical field of oil and gas well engineering, in particular to a method for determining wellhead parameters of a J-shaped well.
Background
The oil gas exploration well is a well drilled for exploring underground oil gas-containing conditions and is called an oil gas exploration well. The drilling work is an important link for exploring and developing oil and natural gas resources, and a country needs to perform a great amount of drilling work to find and develop oil resources.
In the early stage of oil and gas exploration well drilling, the well body structure of a well needs to be scientifically designed. Many times geologists determine the position of a well mouth by themselves in consideration of multiple factors such as operation safety, technical cost, environmental conditions and the like after determining the target point position of an oil-gas well. Meanwhile, due to the consideration of different stratum positions and safety factors, the build rate of the oil and gas exploration well also has a determined range which cannot be changed randomly. In particular, in the design of a J-shaped well commonly used in an oil and gas exploration well, the well body structure needs to be further designed under the conditions of specifying double target points, build-up rate and steady slope sections.
Disclosure of Invention
The embodiment of the invention aims to provide a method for determining wellhead parameters of a J-shaped well, which can calculate wellhead coordinates under the length limiting conditions of double targets, build slope and steady slope sections.
To achieve the purpose, the embodiment of the invention adopts the following technical scheme:
a method of determining wellhead parameters for a J-well, comprising:
acquiring two adjacent traps on the seabed as a first target point and a second target point of a J-shaped well through a sound wave geophysical prospecting device, and determining the respective N-axis coordinate, E-axis coordinate and depth of the first target point and the second target point;
determining the build-up rate and the length of a stable slope section of the J-shaped well through the precision of a build-up tool;
determining a well inclination angle according to the shaft difference value and the depth difference of the second target point and the first target point, and determining an azimuth angle according to the shaft difference value of the first target point and the second target point;
determining the depth of a deflecting end point according to the depth of the second target point, the length of the stable deflecting section and the well inclination angle;
determining the N-axis coordinate of the deflecting end point according to the N-axis coordinate of the second target point, the axial difference value of the second target point and the first target point, the depth difference of the second target point and the deflecting end point and the well inclination angle;
determining the E-axis coordinate of the deflecting end point according to the E-axis coordinate of the second target point, the difference value of each axis of the second target point and the first target point, the depth difference of the second target point and the deflecting end point and the well skew angle;
determining N-axis coordinates of a well head according to the N-axis coordinates of the deflecting end point, the axial difference values of the second target point and the first target point, the deflecting rate and the well deflection angle;
and determining the E-axis coordinate of the wellhead according to the E-axis coordinate of the deflecting end point, the difference value of each axis of the second target point and the first target point, the deflecting rate and the well deflection angle.
Further, acquiring two adjacent traps on the sea bottom as a first target point and a second target point of the J-well through the acoustic geophysical prospecting device comprises:
scanning the seabed by a sound wave geophysical prospecting device to draw a geological structure diagram;
analyzing the geological structure map to obtain the trap meeting oil and gas generation conditions;
selecting two adjacent traps as the first target point and the second target point of the J-shaped well.
Further, determining a well inclination angle according to the shaft difference value and the depth difference of the first target point and the second target point as follows:
wherein α is oblique angle E1-E2The difference value of the E axis and the N axis of the first target point and the second target point1-N2The difference value of the N axis and the H axis of the first target point and the second target point1-H2The depth difference between the first target point and the second target point is obtained.
Further, determining the azimuth angle according to the axis difference value of the first target point and the second target point as follows:
wherein,is an azimuth angle, E2-E1The difference value of the E axis and the N axis of the second target point and the first target point2-N1And the N-axis difference value of the second target point and the first target point is obtained.
Further, determining the depth of a deflecting end point according to the depth of the second target point, the length of the steady inclined section and the well angle as follows:
wherein H3Depth of the deflecting end point, H2Is the depth of the second target point, L is the length of the stabilizer, and α is the angle of the borehole.
Further, the N-axis coordinate of the deflecting end point determined by the N-axis coordinate of the second target point, the axial difference between the second target point and the first target point, the depth difference between the second target point and the deflecting end point, and the angle of the well deviation is as follows:
wherein N is3Is the N-axis coordinate, N, of the deflecting end point2Is the N-axis coordinate, N, of the second target point2-N1The difference value of the N axis of the second target point and the first target point, H2-H3Is the depth difference between the second target point and the deflecting end point, α is the angle of inclination and E2-E1And the E-axis difference value of the second target point and the first target point is obtained.
Further, determining the E-axis coordinate of the whipstock end point according to the E-axis coordinate of the second target point, the axis difference values between the second target point and the first target point, the depth difference between the second target point and the whipstock end point, and the well angle as:
wherein E is3Is the E-axis coordinate, E of the deflecting end point2Is the E-axis coordinate, E of the second target point2-E1The difference value of the E axis and the H axis of the second target point and the first target point2-H3Is the depth difference between the second target point and the whipstock end point and α is the angle of the hole.
Further, determining the N-axis coordinate of the wellhead as follows according to the N-axis coordinate of the whipstock end point, the axial difference between the second target point and the first target point, the whipstock rate and the well angle:
wherein N is4As N-axis coordinates of the wellhead, N3N-axis coordinate and N of the deflecting end point2-N1The difference value of the N axis of the second target point and the first target point is defined as rho, the build slope is defined as p, and the well inclination angle is defined as αAnd E2-E1And the E-axis difference value of the second target point and the first target point is obtained.
Further, determining the E-axis coordinate of the wellhead as follows according to the E-axis coordinate of the whipstock end point, the axis difference values of the second target point and the first target point, the whipstock rate and the well angle:
wherein E is4Is the E-axis coordinate, E of the well head3Is the E-axis coordinate, E of the deflecting end point2-E1The difference of the E axis of the second target point and the first target point, p is the build rate, α is the well angle and N2-N1And the N-axis difference value of the second target point and the first target point is obtained.
The embodiment of the invention has the beneficial effects that:
in the embodiment of the invention, the coordinates of the double target points are obtained through the acoustic geophysical prospecting device, the deflecting rate and the length of the stable deflecting section are determined through the precision of the deflecting tool, and the wellhead coordinates of the J-shaped well are obtained under the condition that the lengths of the double target points, the deflecting rate and the stable deflecting section are determined through multiple factors such as operation safety, technical cost, environmental conditions and the like, so that a proper J-shaped well eye track is designed, the operation time is shortened, and the operation cost is reduced.
Drawings
Fig. 1 is a schematic flow chart of a method for determining wellhead parameters of a J-well according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
The embodiment provides a method for determining wellhead parameters of a J-shaped well, which can obtain wellhead coordinates of the J-shaped well under the condition that the lengths of double target points, build slope and steady slope sections are determined by multiple factors such as operation safety, technical cost and environmental conditions. Fig. 1 is a schematic flow chart of a method for determining wellhead parameters of a J-well according to an embodiment of the present invention. As shown in fig. 1, the method includes:
s10, acquiring two adjacent traps on the sea bottom through the acoustic geophysical prospecting device to serve as a first target point and a second target point of the J-shaped well, and determining the N-axis coordinate, the E-axis coordinate and the depth of the first target point and the second target point respectively.
Specifically, acquiring two adjacent traps on the sea bottom as a first target point and a second target point of a J-shaped well through a sonic geophysical prospecting device comprises the following steps:
and scanning the seabed by a sound wave geophysical prospecting device to draw a geological structure map.
Furthermore, cable operation is carried out in the sea area through the sound wave geophysical prospecting ship, the sea bottom is scanned through sound waves, and a geological structure diagram is drawn according to the result.
Analyzing the geological structure map to obtain the traps meeting the oil and gas generation conditions.
Selecting two adjacent traps as the first target point and the second target point of the J-shaped well.
Wherein, the trap is composed of 3 parts: reservoir rocks for storing oil gas, cover rocks for preventing oil gas from being dissipated and shelters for preventing the oil gas from continuously moving are arranged on the reservoir rocks, and the places where the oil gas can continuously move and can be gathered can be prevented.
Further, determining the N-axis coordinate, the E-axis coordinate, and the depth of the first target point and the second target point are determining the N-axis coordinate, the E-axis coordinate, and the depth of the ground plane of the WGS84 coordinate system of the first target point and the second target point.
S11, determining the build rate and the length of a steady slope section of the J-shaped well through the precision of the build tool;
specifically, based on the influence of the whipstock tool, the rate of the kick-off of the J-well does not exceed 30 °/30 m. In the present embodiment, the build rate is preferably from 20 °/30m to 30 °/30 m.
Based on the precision of the deflecting tool, the length of the deflecting segment is 180 meters in the embodiment, so that enough adjusting space can be left, the error of actual work can be corrected, and the material and time are not wasted too much.
S12, determining a skew angle according to the axis difference and the depth difference of the second target point and the first target point, and determining an azimuth angle according to the axis difference of the first target point and the second target point.
Specifically, the well inclination angle is calculated according to the following formula:
wherein α is a bevel angle E1-E2The difference value of the E axis and the N axis of the first target point and the second target point1-N2The difference value of the N axis and the H axis of the first target point and the second target point1-H2The depth difference between the first target point and the second target point is obtained.
The azimuth calculation is performed according to the following formula:
wherein,is an azimuth angle, E2-E1The difference value of the E axis and the N axis of the second target point and the first target point2-N1And the N-axis difference value of the second target point and the first target point is obtained.
And S13, determining the depth of the deflecting end point according to the depth of the second target point, the length of the steady inclined section and the well deviation angle.
Specifically, the depth of the deflecting end point is calculated according to the following formula:
wherein H3Depth of the deflecting end point, H2Is the depth of the second target point, L is the length of the stabilizer, and α is the angle of the borehole.
And S14, determining the N-axis coordinate of the deflecting end point according to the N-axis coordinate of the second target point, the axial difference value between the second target point and the first target point, the depth difference between the second target point and the deflecting end point and the well deviation angle.
Specifically, the N-axis coordinate calculation of the whipstock end point is performed according to the following formula:
wherein N is3Is the N-axis coordinate and N in the WGS84 coordinate system of the deflecting end point2Is the N-axis coordinate, N, of the second target point2-N1The difference value of the N axis of the second target point and the first target point, H2-H3Is the depth difference between the second target point and the deflecting end point, α is the angle of inclination and E2-E1And the E-axis difference value of the second target point and the first target point is obtained.
And S15, determining the E-axis coordinate of the deflecting end point according to the E-axis coordinate of the second target point, the difference value of the second target point and the first target point, the depth difference of the second target point and the deflecting end point and the well deviation angle.
Specifically, the E-axis coordinate of the whipstock end point is calculated according to the following formula:
wherein E is3Is the E-axis coordinate and the E-axis coordinate in the WGS84 coordinate system of the deflecting end point2Is the E-axis coordinate, E of the second target point2-E1The difference value of the E axis and the H axis of the second target point and the first target point2-H3Is the depth difference between the second target point and the whipstock end point and α is the angle of the hole.
And S16, determining the N-axis coordinate of the well head according to the N-axis coordinate of the deflecting end point, the axial difference values of the second target point and the first target point, the deflecting rate and the well deflection angle.
Specifically, the N-axis coordinate of the wellhead is calculated according to the following formula:
wherein N is4N-axis coordinate in WGS84 coordinate system of well head3N-axis coordinate and N of the deflecting end point2-N1Is the N-axis difference, ρ is the build rate, α is the well angle and E of the second target point and the first target point2-E1And the E-axis difference value of the second target point and the first target point is obtained.
And S17, determining the E-axis coordinate of the wellhead according to the E-axis coordinate of the deflecting end point, the difference value of each axis of the second target point and the first target point, the deflecting rate and the well deflection angle.
Specifically, the E-axis coordinate of the wellhead is calculated according to the following formula:
wherein E is4Is the E-axis coordinate and the E-axis coordinate in the WGS84 coordinate system of the well head3Is the E-axis coordinate, E of the deflecting end point2-E1The difference of the E axis of the second target point and the first target point, p is the build rate, α is the well angle and N2-N1And the N-axis difference value of the second target point and the first target point is obtained.
According to the embodiment, the wellhead coordinates of the J-shaped well can be obtained under the condition that the lengths of the double target points, the build slope and the steady slope section are determined by multiple factors such as operation safety, technical cost and environmental conditions, so that a suitable J-shaped well track is designed, the operation time is shortened, and the operation cost is reduced.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. A method of determining wellhead parameters for a J-well, comprising:
acquiring two adjacent traps on the seabed as a first target point and a second target point of a J-shaped well through a sound wave geophysical prospecting device, and determining the respective N-axis coordinate, E-axis coordinate and depth of the first target point and the second target point;
determining the build-up rate and the length of a stable slope section of the J-shaped well through the precision of a build-up tool;
determining a well inclination angle according to the shaft difference value and the depth difference of the second target point and the first target point, and determining an azimuth angle according to the shaft difference value of the first target point and the second target point;
determining the depth of a deflecting end point according to the depth of the second target point, the length of the stable deflecting section and the well inclination angle;
determining the N-axis coordinate of the deflecting end point according to the N-axis coordinate of the second target point, the axial difference value of the second target point and the first target point, the depth difference of the second target point and the deflecting end point and the well inclination angle;
determining the E-axis coordinate of the deflecting end point according to the E-axis coordinate of the second target point, the difference value of each axis of the second target point and the first target point, the depth difference of the second target point and the deflecting end point and the well skew angle;
determining N-axis coordinates of a well head according to the N-axis coordinates of the deflecting end point, the axial difference values of the second target point and the first target point, the deflecting rate and the well deflection angle;
and determining the E-axis coordinate of the wellhead according to the E-axis coordinate of the deflecting end point, the difference value of each axis of the second target point and the first target point, the deflecting rate and the well deflection angle.
2. A method for determining wellhead parameters according to claim 1 and wherein acquiring two adjacent traps on the seafloor as a first target point and a second target point of a J-well by a sonic geophysical prospecting comprises:
scanning the seabed by a sound wave geophysical prospecting device to draw a geological structure diagram;
analyzing the geological structure map to obtain the trap meeting oil and gas generation conditions;
selecting two adjacent traps as the first target point and the second target point of the J-shaped well.
3. A method as claimed in claim 1, wherein determining a borehole angle from the axis and depth differences of the first and second target points is:
wherein α is oblique angle E1-E2The difference value of the E axis and the N axis of the first target point and the second target point1-N2The difference value of the N axis and the H axis of the first target point and the second target point1-H2The depth difference between the first target point and the second target point is obtained.
4. A method as claimed in claim 1, wherein determining an azimuth angle from the axis difference of the first target point and the second target point is:
wherein,is an azimuth angle, E2-E1The difference value of the E axis and the N axis of the second target point and the first target point2-N1And the N-axis difference value of the second target point and the first target point is obtained.
5. A method as claimed in claim 1, wherein determining the depth of a whipstock end point from the depth of the second target point, the length of the whipstock section and the angle of the well bore is:
wherein H3Depth of the deflecting end point, H2Is the depth of the second target point, L is the length of the stabilizer, and α is the angle of the borehole.
6. A method as defined in claim 1, wherein the N-axis coordinates of the second target point, the difference between the axes of the second target point and the first target point, the difference between the depths of the second target point and the whipstock end point, and the angle of the well bore determine the N-axis coordinates of the whipstock end point as:
wherein N is3Is the N-axis coordinate, N, of the deflecting end point2Is the N-axis coordinate, N, of the second target point2-N1The difference value of the N axis of the second target point and the first target point, H2-H3Is the depth difference between the second target point and the deflecting end point, α is the angle of inclination and E2-E1And the E-axis difference value of the second target point and the first target point is obtained.
7. A method as defined in claim 1, wherein determining the E-axis coordinate of the whipstock end point from the E-axis coordinate of the second target point, the difference between the second target point and the first target point, the difference between the second target point and the depth of the whipstock end point, and the kick-off angle is:
wherein E is3Is the E-axis coordinate, E of the deflecting end point2Is the E-axis coordinate, E of the second target point2-E1The difference value of the E axis and the H axis of the second target point and the first target point2-H3Is the depth difference between the second target point and the whipstock end point and α is the angle of the hole.
8. A method as defined in claim 1, wherein determining the N-axis coordinate of the wellhead from the N-axis coordinate of the whipstock end point, the difference between the axes of the second target point and the first target point, the whipstock rate, and the kick-off angle is:
wherein N is4As N-axis coordinates of the wellhead, N3N-axis coordinate and N of the deflecting end point2-N1Is the N-axis difference, ρ is the build rate, α is the well angle and E of the second target point and the first target point2-E1And the E-axis difference value of the second target point and the first target point is obtained.
9. A method as defined in claim 1, wherein determining the E-axis coordinate of the wellhead from the E-axis coordinate of the whipstock end point, the difference between the axes of the second target point and the first target point, the whipstock rate, and the kick-off angle is:
wherein E is4Is the E-axis coordinate, E of the well head3Is the E-axis coordinate, E of the deflecting end point2-E1The difference of the E axis of the second target point and the first target point, p is the build rate, α is the well angle and N2-N1And the N-axis difference value of the second target point and the first target point is obtained.
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| CN102392601A (en) * | 2011-10-09 | 2012-03-28 | 中国石油化工股份有限公司 | Method for determining hole trajectory of multi-target horizontal well |
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| CN104653172A (en) * | 2014-12-10 | 2015-05-27 | 中国石油化工股份有限公司 | Determination method for initial well deviation azimuth angle of three-dimensional horizontal well borehole trajectory |
| CN105114059A (en) * | 2015-08-03 | 2015-12-02 | 中国地质大学（武汉） | Three-dimensional directional well trajectory design and control parameter discrimination method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112761570A (en) * | 2019-11-04 | 2021-05-07 | 中国石油化工股份有限公司 | Natural gas upwarping horizontal well completion method |
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