A secondary measurement method for wellbore trajectory

Abstract

The invention discloses a secondary measurement method for a borehole trajectory. The theoretical inclination position of the borehole is determined according to the first measurement data of the borehole trajectory and is set as a reference inclination point. After the oil pipe is completely lowered into the borehole, the eccentric wear position of the oil pipe at the reference inclination point is marked as a predetermined eccentric wear point. A pressure assembly is set at the predetermined eccentric wear point. When the oil pipe is evenly lowered into the borehole, when the pressure assembly enters the bottom of an artificial well along with the oil pipe, a pressure spring is set to be in a compressed state. A pressure sensor detects the pressure value of a pressure contact at any time. After the oil pipe is lowered to the bottom of the borehole, the oil pipe is taken out and the value of the pressure value of the pressure spring in a storage chip that changes with time is read. According to the changes in the positive pressure value and the negative pressure value, the first measurement data of the borehole trajectory is corrected. The invention can not only obtain accurate values ​​of the well inclination and azimuth, but also accurately calculate the trajectory change trend inside the borehole.

Description

Technical field:

[0002] The invention relates to the technical field of oilfield exploitation, in particular to a secondary measurement method of a wellbore trajectory. Background technology:

[0004] In the process of carrying out the anti-eccentric wear work of oil well pipes, it is often found that the well sections with little change in inclination and azimuth angles have eccentric wear, which is different from the inclination data provided by the logging company that the original anti-eccentric wear plan relies on, and the anti-eccentric wear design plan has to be readjusted. There are many reasons for this result. Therefore, it is necessary to measure the trajectory of the wellbore after completion. At present, in view of the deviation of the inclination data provided by the logging company, many oil field production companies directly abandon the data provided by the logging company and re-measure by themselves. However, re-measurement by themselves is costly on the one hand, and at present, oil field production companies generally use calipers for measurement. This measurement method can only measure the deformation, corrosion, rupture, etc. of the casing at a certain place. Its principle is to judge based on the length of multiple sets of bridge probes, but it cannot measure the trajectory changes of the entire wellbore. Summary of the invention:

[0006] The object of the present invention is to provide a secondary measurement method for wellbore trajectory to solve one or more of the above-mentioned prior art problems.

[0007] In order to solve the above technical problems, the innovation of the present invention is that it specifically comprises the following steps:

[0008] S1. Determine the theoretical inclination position of the wellbore according to the first measurement data of the wellbore trajectory and set it as the reference inclination point. After the oil pipe is completely lowered into the wellbore, the eccentric wear position of the oil pipe at the reference inclination point is marked as the predetermined eccentric wear point;

[0009] S2. Setting a pressure assembly at a predetermined eccentric wear point, the pressure assembly comprising a pressure contact that can be elastically moved on the oil pipe and a storage chip arranged on the surface of the oil pipe, a pressure spring is connected between the pressure contact and the surface of the oil pipe, and a pressure sensor for detecting the pressure contact is arranged on the surface of the oil pipe;

[0010] S3. When the oil pipe is evenly lowered into the wellbore, the pressure assembly enters the bottom of the artificial well along with the oil pipe, and the pressure spring is set to be in a compressed state, and the pressure sensor detects the pressure value of the pressure contact at any time;

[0011] S4. According to the first measurement data, the pressure value of the reference tilt point on the pressure contact is set as the reference pressure value;

[0012] S5. After the oil pipe is lowered to the bottom of the wellbore, the oil pipe is taken out and the value of the pressure value of the pressure spring in the storage chip that changes with time is read out, wherein the data in the storage chip that is greater than the reference pressure value is set as a positive pressure value, and the data in the storage chip that is less than the reference pressure value is set as a negative pressure value;

[0013] S6. Correct the first measurement data of the wellbore trajectory according to the changes in the positive pressure value and the negative pressure value.

[0014] Furthermore, the first measurement data of the wellbore includes well depth, well inclination angle and well inclination azimuth.

[0015] Furthermore, the number of the above-mentioned pressure assemblies is six, and the pressure assemblies are evenly distributed on the circumferential surface of the oil pipe.

[0016] Furthermore, each pressure assembly corresponds to a positive pressure value and a negative pressure value inside the wellbore, and when correcting the first measurement data of the wellbore trajectory, an average value of different positive pressure values ​​and negative pressure values ​​is taken.

[0017] Furthermore, the surface of the pressure contact is an inclined surface, and the inclined direction of the inclined surface is toward the bottom of the oil pipe.

[0018] Furthermore, a plurality of rollers are distributed on the surface of the inclined surface, and the rollers are universal wheels.

[0019] Furthermore, when the oil pipe is evenly lowered into the wellbore, the oil pipe is rotated in a forward and reverse manner to enter the wellbore, and the roller can freely adjust its position according to the rotation direction of the oil pipe.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention provides a secondary measurement method for wellbore trajectory. With the first measurement data of the wellbore as a reference, the positive pressure value and the negative pressure value of the predetermined eccentric wear point are calculated by measuring the pressure assembly, and a change curve diagram of the well depth and the first measurement data, the positive pressure value and the negative pressure value is drawn on the same graph. At the reference inclination point position of the first measurement data, the corresponding well inclination angle is added with the positive pressure value or subtracted with the negative pressure value, so that accurate well inclination angle and azimuth angle values ​​can be obtained, and then the trajectory change trend inside the wellbore can be accurately calculated.

[0022] 2. The present invention provides a secondary measurement method for wellbore trajectory. Each pressure assembly corresponds to a positive pressure value and a negative pressure value inside the wellbore. When correcting the first measurement data of the wellbore trajectory, multiple pressure assemblies are set and the average value of different positive pressure values ​​and negative pressure values ​​is taken. By setting the average value of the positive pressure value and the negative pressure value, the accuracy of the numerical measurement of the final well inclination and azimuth is improved.

[0023] 3. The present invention provides a secondary measurement method for the wellbore trajectory, which utilizes the rolling of a roller on the inner wall of the wellbore to facilitate the gradual deepening of the casing into the wellbore. The forward and reverse rotation of the oil pipe is conducive to the six pressure assemblies being able to fully contact the inner wall of the wellbore, and the roller is set as a universal wheel that can automatically adapt to the rolling direction on the inner wall of the wellbore according to the rotation of the oil pipe. Description of the drawings:

[0025] Figure 1 It is a cross-sectional view of the surface of the oil pipe of the present invention.

[0026] Figure 2 It is a schematic diagram of the side structure of the pressure assembly of the present invention. Specific implementation method:

[0028] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0029] like Figure 1 to Figure 2 A specific implementation of the present invention specifically includes the following steps:

[0030] S1, determining the theoretical inclination position of the wellbore according to the first measurement data of the wellbore trajectory and setting it as the reference inclination point. After the oil pipe 101 is completely lowered into the wellbore, the eccentric wear position of the oil pipe 101 at the reference inclination point is marked as the predetermined eccentric wear point 1;

[0031] S2, setting a pressure assembly 2 at a predetermined eccentric wear point 1, the pressure assembly 2 comprising a pressure contact 21 that can be elastically movable on the oil pipe 101 and a storage chip 22 arranged on the surface of the oil pipe 101, a pressure spring 3 is connected between the pressure contact 21 and the surface of the oil pipe 101, and a pressure sensor 4 for detecting the pressure contact 21 is arranged on the surface of the oil pipe 101;

[0032] S3, when the oil pipe 101 is evenly lowered into the wellbore, when the pressure assembly 2 enters the bottom of the artificial well along with the oil pipe 101, the pressure spring 3 is set to be in a compressed state, and the pressure sensor 4 detects the pressure value of the pressure contact 21 at any time;

[0033] S4, according to the first measurement data, the pressure value of the reference tilt point on the pressure contact 21 is set as the reference pressure value;

[0034] S5. After the oil pipe 101 is lowered to the bottom of the wellbore, the oil pipe 101 is taken out and the value of the pressure value of the pressure spring 3 in the storage chip 22 that changes with time is read out, wherein the data in the storage chip 22 that is greater than the reference pressure value is set as a positive pressure value, and the data in the storage chip 22 that is less than the reference pressure value is set as a negative pressure value;

[0035] S6. Correct the first measurement data of the wellbore trajectory according to the changes in the positive pressure value and the negative pressure value.

[0036] In the present invention, with the first measurement data of the wellbore as a reference, the positive pressure value and the negative pressure value of the predetermined eccentric wear point 1 are measured and calculated by the pressure assembly 2, and a change curve diagram of the well depth and the first measurement data, the positive pressure value and the negative pressure value are drawn on the same graph. At the reference inclination point position of the first measurement data, the corresponding well inclination angle is added with the positive pressure value or subtracted with the negative pressure value, so that accurate values ​​of the well inclination angle and the azimuth angle can be obtained, and then the trajectory change trend inside the wellbore can be accurately calculated.

[0037] In the present invention, as a preferred solution, the first measurement data of the wellbore includes well depth, well inclination angle and well inclination azimuth.

[0038] In the present invention, as a preferred solution, the number of the above-mentioned pressure assemblies 2 is six, and several pressure assemblies 2 are evenly distributed on the circumferential surface of the oil pipe 101. The number of pressure assemblies 2 is selected to be six, which can meet the distribution requirements of the circumferential surface of the casing.

[0039] In the present invention, as a preferred solution, each pressure assembly 2 corresponds to a positive pressure value and a negative pressure value inside the wellbore. When the first measurement data of the wellbore trajectory is corrected, the average value of different positive pressure values ​​and negative pressure values ​​is taken. By setting the average value of the positive pressure value and the negative pressure value, the accuracy of the numerical measurement of the final well inclination and azimuth is improved.

[0040] In the present invention, as a preferred embodiment, the surface of the pressure contact 21 is an inclined surface 211, and the inclined direction of the inclined surface 211 is toward the bottom of the oil pipe 101. The setting of the inclined surface 211 is consistent with the introduction direction of the oil pipe 101 inside the wellbore, which is conducive to the introduction of the oil pipe 101 inside the wellbore.

[0041] In the present invention, as a preferred solution, a plurality of rollers 212 are distributed on the surface of the inclined surface 211, and the rollers 212 are universal wheels.

[0042] In the present invention, as a preferred solution, when the oil pipe 101 is evenly lowered into the wellbore, the oil pipe 101 is rotated forward and reversely into the wellbore, and the roller 212 freely adjusts its position according to the rotation direction of the oil pipe 101.

[0043] In the present invention, the roller 212 is used to roll on the inner wall of the wellbore to facilitate the gradual penetration of the casing into the wellbore. The forward and reverse rotation of the oil pipe 101 is conducive to the six pressure assemblies 2 being able to fully contact the inner wall of the wellbore, and the roller 212 is set as a universal wheel that can automatically adapt to the rolling direction on the inner wall of the wellbore according to the rotation of the oil pipe 101.

[0044] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A secondary measurement method for wellbore trajectory, characterized in that: The specific steps include: S1, determining a theoretical inclination position of the wellbore according to the first measurement data of the wellbore trajectory and setting it as a reference inclination point, and after the oil pipe (101) is completely lowered into the wellbore, marking the eccentric wear position of the oil pipe (101) at the reference inclination point as a predetermined eccentric wear point (1); S2, setting a pressure assembly (2) at the predetermined eccentric wear point (1), the pressure assembly (2) comprising a pressure contact (21) that is elastically movable on the oil pipe (101) and a storage chip (22) arranged on the surface of the oil pipe (101), a pressure spring (3) being connected between the pressure contact (21) and the surface of the oil pipe (101), and a pressure sensor (4) for detecting the pressure contact (21) being arranged on the surface of the oil pipe (101); S3, when the oil pipe (101) is evenly lowered into the wellbore, when the pressure assembly (2) enters the bottom of the artificial well along with the oil pipe (101), the pressure spring (3) is set to be in a compressed state, and the pressure sensor (4) detects the pressure value of the pressure contact (21) at any time; S4, according to the first measurement data, the pressure value of the reference tilt point on the pressure contact (21) is set as the reference pressure value; S5. After the oil pipe (101) is lowered to the bottom of the wellbore, the oil pipe (101) is taken out and the value of the pressure value of the pressure spring (3) in the storage chip (22) that changes with time is read out, wherein the data in the storage chip (22) that is greater than the reference pressure value is set as a positive pressure value, and the data in the storage chip (22) that is less than the reference pressure value is set as a negative pressure value; S6. Correct the first measurement data of the wellbore trajectory according to the changes in the positive pressure value and the negative pressure value.

2. A secondary measurement method for wellbore trajectory according to claim 1, characterized in that: The first measurement data of the wellbore includes well depth, well inclination angle and well inclination azimuth.

3. A secondary measurement method for wellbore trajectory according to claim 1, characterized in that: The number of the pressure assemblies (2) is six, and the six pressure assemblies (2) are evenly distributed on the circumferential surface of the oil pipe (101).

4. A secondary measurement method of a wellbore trajectory according to claim 3, characterized in that: Each of the pressure assemblies (2) corresponds to a positive pressure value and a negative pressure value inside the wellbore. When correcting the first measurement data of the wellbore trajectory, an average value of different positive pressure values ​​and negative pressure values ​​is taken.

5. The secondary measurement method of a wellbore trajectory according to claim 1, characterized in that: The surface of the pressure contact (21) is an inclined surface (211), and the inclined direction of the inclined surface (211) is toward the bottom of the oil pipe (101).

6. A secondary measurement method of a wellbore trajectory according to claim 5, characterized in that: A plurality of rollers (212) are distributed on the surface of the inclined surface (211), and the rollers (212) are universal wheels.

7. A secondary measurement method for wellbore trajectory according to claim 6, characterized in that: When the oil pipe (101) is evenly lowered into the wellbore, the oil pipe (101) is rotated in a forward and reverse manner to enter the wellbore, and the roller (212) freely adjusts its position according to the rotation direction of the oil pipe (101).

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