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Monitoring method for drilled wellbore trajectories

A trajectory and drilling technology, applied in wellbore/well components, surveying, earthmoving, etc., can solve problems limited to two-dimensional wellbore

Inactive Publication Date: 2009-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on catenary trajectory and parabolic trajectory is only used for borehole trajectory design, and is limited to two-dimensional wellbore profile

Method used

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  • Monitoring method for drilled wellbore trajectories
  • Monitoring method for drilled wellbore trajectories
  • Monitoring method for drilled wellbore trajectories

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0111] The inclination data (well depth, well inclination and azimuth) on the catenary trajectory are shown in Table 1. Table 1 gives the summary of the calculation results of the present invention, and Table 2 shows the summary of the calculation results of the minimum curvature method in the prior art. To simplify the space, only a part of the well depth data are listed in the table.

[0112] Table 1 Catenary track calculation result of the present invention

[0113] well depth m Well inclination (°) Azimuth (°) North coordinate m East coordinate m Vertical depth m Horizontal length m 426.00 42.00 66.36 17.23* 40.65* 415.02* 44.15* 678.85 43.98 56.25 99.96 191.60 600.00 216.51 1259.88 49.12 56.25 333.95 541.79 999.99 637.68 3382.95 76.40 98.71 697.88 2313.09 1999.96 2487.65 3482.98 78.00 98.71 683.11 2409.50 2022.12 2585.19

[0114] Table 2 Calculation results of catenary trajectory by minimum curva...

example 2

[0118] The inclinometer data on the parabolic trajectory are shown in Table 3. Table 3 shows the summary of the calculation results of the present invention, and Table 4 shows the summary of the calculation results of the minimum curvature method in the prior art. To simplify the space, only a part of the well depth data are listed in the table.

[0119] Table 3 Parabolic trajectory calculation result of the present invention

[0120]

[0121] Table 4 Calculation results of parabolic trajectory by minimum curvature method

[0122]

[0123] In the above tables, * Represents a known initial value.

[0124] From the parabolic trajectory of well depth 426.00m to 3322.34m, if the north coordinate increment, east coordinate increment, vertical depth increment and horizontal length increment calculated by the minimum curvature method are compared with the present invention, its errors are respectively - 54.39m, 28.82m, -31.91m and 16.69m.

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Abstract

The invention relates to a drilling engineering technology in petroleum engineering, in particular to a method for monitoring the track of an actually drilled wellbore. The method comprises the following steps: acquisition of inclination survey data and naturalization treatment; determination of characteristic parameters of a wellbore track model; determination of a hole inclination equation and an azimuth equation; calculation of coordinate increment; calculation of surveying point coordinates; and so on. As for large-displacement wells containing catenary or parabola tracks and various directional wells and horizontal wells, the method can accurately monitor the coordinates of various surveying points, so as to make the monitoring result accord with the practice of the drilling engineering, thereby effectively improving the construction precision and the reliability of catenary drilling and parabola drilling.

Description

technical field [0001] The invention relates to the drilling engineering technology of petroleum engineering, in particular to a monitoring method of the actual drilling trajectory. Background technique [0002] The inclination calculation of actual drilling trajectory is an important link in oil drilling, and it is also an important basic data for cementing and completion, oil production technology, downhole operation and oilfield development. Whether it is measurement while drilling during drilling or re-measurement after well completion, a series of measurement points can be obtained, and each measurement point gives the inclination angle and azimuth angle corresponding to the well depth. The main task of inclinometer calculation is to calculate the coordinate positions of these measuring points according to the inclination measurement data, so as to obtain the shape of the actual drilling trajectory. [0003] The actual wellbore trajectory is a continuous and smooth spa...

Claims

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Application Information

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IPC IPC(8): E21B47/02
Inventor 刘修善
Owner CHINA PETROLEUM & CHEM CORP
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