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Inclined hole correction method of logging information

A correction method and logging data technology, which is applied in the direction of wellbore/well components, measurement, earthwork drilling and production, etc., to achieve the effect of reducing the cost of correction, simple correction steps, and accurate correction results

Inactive Publication Date: 2013-03-27
王维
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  • Description
  • Claims
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  • Inclined hole correction method of logging information
  • Inclined hole correction method of logging information
  • Inclined hole correction method of logging information

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Embodiment

[0022] The invention relates to a deviated well correction method for well logging data, comprising the following steps:

[0023] (a) First, it is assumed that the curvature of each section of the deviated well to be corrected is a constant, that is, the variation of the inclination angle δ with the depth h is a constant;

[0024] (b) Assuming that the well inclination angle at a certain depth point is α, a sufficiently small section dh on the inclined well can be regarded as a straight line section. That is, if a micro-element segment dS is taken near this wellbore trajectory point, its ordinate increment is;

[0025] dH z =cos adS

[0026] (c) When calculating the vertical depth, the wellbore from point n to point n+1 needs to be regarded as a length unit, and the average inclination angle of point n and point n+1 is used as the average inclination angle of this well section, then Its geometric relationship can be expressed as follows:

[0027] ...

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Abstract

The invention discloses an inclined hole correction method of logging information. The inclined hole correction method of the logging information comprises the steps of (a) at first, assuming the curvature of each hole section of an inclined hole required to be corrected as a constant; (b) assuming a hole deviation angle at a depth point as alpha and regarding a small-enough section dh of the inclined hole as a linear section; and (c) taking a section from a No. n point to a NO. n+1 point of the drill hole as a length unit and using an average value of the hole deviation angles at the No. n point and the NO. n+1 point as an average hole deviation angle of the hole section to obtain a vertical depth calculation formula, working out each inclined depth point H(n) and each corresponding vertical depth Hz(n) based on the formula, assigning logging data which correspond to H(n) to Hz(n) and simultaneously performing equal interval operations on newly generated data from Hz(n) to Vz log to form the logging data equivalent to the logging data of a straight hole. With the adoption of the inclined hole correction method of the logging information, the inclined hole correction of the logging information can be completed fast; and moreover, the correction result is precise, the correction steps are simple and the correction cost is lowered greatly.

Description

technical field [0001] The invention relates to a deviated well correction method for logging data. Background technique [0002] During the "Ninth Five-Year Plan" period, sidetracking of old wells was established as a national key scientific research project in China, and scientific research was carried out in Shengli Oilfield, Dagang Oilfield, Liaohe Oilfield, Daqing Oilfield and Xinjiang Oilfield. Sidetracking horizontal wells by opening windows in old wells with curvature has achieved good economic benefits. After decades of development, the sidetracking (sidetracking horizontal well) technology is now recognized as a good technology for restoring the production of old wells at home and abroad. In many respects, the sidetracking (sidetracking horizontal well) technology is compared with vertical wells , have considerable advantages, such as reducing the cost of oilfield development, tapping the remaining oil potential of old oilfields, and improving recovery. At presen...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00
Inventor 王维
Owner 王维
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