Method and device for determining depth of instrument in well

An instrument and depth technology, applied in the field of determining the depth of objects in the well, can solve the problems of waste of manpower and material resources, difficult operation, etc., and achieve the effect of accurate research and improvement of progress

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An instrument and depth technology, applied in the field of determining the depth of objects in the well, can solve the problems of waste of manpower and material resources, difficult operation, etc., and achieve the effect of accurate research and improvement of progress

CN103806899AActive Publication Date: 2014-05-21CNPC GREATWALL DRILLING ENG

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[0023] Hereinafter, specific embodiments will be described in conjunction with the accompanying drawings, so as to better understand the features and advantages of the present invention.

[0024] The following detailed description refers to the accompanying drawings that show, by way of illustration, specific details and embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. Other embodiments may be utilized and structural, logical, and electrical changes may be made without departing from the scope of the present invention. The various embodiments are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments.

[0025] In the following detailed description, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiment...

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Abstract

The invention relates to a method for determining depth of an instrument in a well. The method comprises the following steps (a) the instrument at one end of a cable is put into the well, and lengths of the cable stretching into the well at different time sampling points are recorded; (b) the accelerated speed of the instrument is measured, the accelerated speed is transmitted to a receiver at the other end of the cable, the receiver further receivers the recorded lengths of the cable stretching into the well, and a counter counts numbers of the time sampling points; (c) the received accelerated speed is corrected by selecting slidable time windows; (d) the movement speed of the instrument at the time sampling points of the selected time windows is calculated according to obtained data; (e) the depth of the instrument at the time sampling points of the selected time window in the well is determined through the obtained data; (f) the steps (c) to (e) are repeated until the number of the remaining time sampling points is smaller than n.

Description

technical field [0001] The present invention relates to a method of determining the depth of an object in a well, in particular, the present invention relates to a method and apparatus for determining the depth of an instrument in a well. Background technique [0002] In the well logging process, there are usually two ways to obtain the depth of the logging tool moving down the well at different times. The first way is to determine the length of the cable moving downhole by recording the wellhead; the second way The way is to make magnetic marks on the cable at equal intervals under constant tension, and the depth of the instrument in the downhole can be obtained by detecting the magnetic marks during the logging process. [0003] In practical applications, the first method is usually used to measure the depth of the logging tool in the well. During its operation, due to the elasticity of the cable, the logging tool will be subjected to various blocking effects in the downh...

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Application Information

Patent Timeline

21 May 2014

Publication

CN103806899A

IPC: E21B47/04

Inventors: 吴翔; 刘越