Downhole tool depth measurement method for resource exploration and development

Abstract

The invention relates to the technical field of downhole measurement of oil fields, in particular to a downhole tool depth measurement method for resource exploration and development. The downhole tool depth measurement method comprises the steps that the rising and falling height of a drilling tool along with the time change is measured through an existing tool, and the initial depth of a downhole tool is obtained preliminarily through invalid data removal and drilling tool depth combination; a high-speed axial acceleration measurement instrument is connected to the drilling tool in a matched mode, and the accelerated speed of the downhole tool along with the time change is recorded; the depth of the downhole tool is calculated according to the downhole accelerated speed; and the accurate depth of the downhole tool is finally obtained with the initial depth, obtained through ground measurement, of the downhole tool as the reference. According to the depth measurement method, the characteristics that the drilling tool is in the static state at least twice each time the drilling tool rises and falls, and the speed of the drilling tool is known and is zero are fully utilized, the depth of the downhole tool can be accurately obtained through the combination of accelerated speed data and the velocity-time integral, and the problems that the depth errors of the downhole tool are large and the correspondency of a measurement curve is poor are solved fundamentally.

Description

technical field [0001] The invention relates to the technical field of downhole measurement in oil fields, in particular to a method for measuring the depth of downhole tools for resource exploration and development. Background technique [0002] During resource exploration and development, many production operations require accurate real-time depth measurement of downhole tools. Such as drilling, mud logging, well logging (such as pump-out storage logging, through-drill storage logging, logging while drilling, etc.), in order to record the depth of downhole tools in real time, the depth system needs two parts of data, respectively For the time-data file stored by the downhole instrument and the time-depth file of the hook height change recorded on the surface, the time-depth conversion is performed on the two to generate the depth-data file. [0003] Different from the continuous depth measurement of wireline logging, this kind of construction measures discontinuous, secti...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for measuring the depth of downhole tools for resource exploration and development, so as to overcome the large depth error and poor correspondence of the curve itself in the depth-data files generated by the prior art, and due to the downhole The acceleration of the instrument and the hook of the drill floor is inconsistent, which will also cause defects such as inaccurate depth

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