A temperature calibration method for an azimuth electromagnetic wave boundary detection instrument while drilling
A technology of detection instruments and temperature scales, which is applied in earthwork drilling, wellbore/well components, buildings, etc., and can solve problems such as temperature correction methods that do not involve the ZX component.
Active Publication Date: 2021-09-14
CHINA PETROCHEMICAL CORP +4
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Problems solved by technology
[0004] In recent years, the design and manufacture of azimuth electromagnetic wave instruments while drilling has developed rapidly in China, and a series of azimuth electromagnetic wave resistivity measurement methods and devices have been proposed, such as an electromagnetic wave resistivity logging while drilling tool (201410773943.8), A device for measuring resistivity while drilling and its measurement method (201310698427.9), the basic principle is to add a transverse antenna and measure the ZX component to detect the formation boundary and azimuth, but neither involves the temperature correction method of ZX component measurement
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[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0027] Refer to attached Figure 4 , with Figure 4 It shows the temperature scale process in the embodiment of the present invention. The method is aimed at adopting at least one axial antenna and one transverse antenna as the boundary detection instrument for transmitting and receiving respectively; measuring the directional electromotive force signal at different temperatures; numerically simulating the directional electromotive force signal as a standard signal; using the standar...
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The invention discloses a temperature calibration method of an azimuth-while-drilling electromagnetic wave boundary detection instrument. The method adopts an axial antenna and a transverse antenna as the transmitting and receiving azimuth-while-drilling electromagnetic wave boundary detection instruments respectively, and proposes a temperature calibration method. The instrument is heated to the highest rated working temperature, placed on the interface composed of air and a solution of known conductivity, and the directional electromotive force signals at different temperatures are recorded until the instrument cools to room temperature. Reheat the instrument to the highest rated working temperature, repeat the steps, change the distance between the instrument and the interface or change the conductivity of the solution, and record the directional electromotive force signal at different temperatures. The directional electromotive force signal under the above conditions is simulated as the standard signal, and the temperature scale coefficient is fitted by using the standard signal and two different directional electromotive force values at the same temperature. The calibration method provided by the invention enables the instrument to obtain the same directional electromotive force amplitude under the determined interface conditions, thereby eliminating the influence of temperature.
Description
technical field [0001] The invention relates to a temperature calibration method of a formation boundary detection instrument in the technical fields of measurement while drilling and logging while drilling, in particular to a temperature scale of an azimuth electromagnetic wave boundary detection instrument for providing formation boundary prediction in a geosteering measurement while drilling system method. Background technique [0002] With the improvement of oilfield exploration and development and the needs of production, small oil layers, thin oil layers, fault block oil layers and depleted remaining oil reservoirs in old oil fields are redeveloped and utilized. Due to the complex geological structure of the above oil reservoirs, conventional vertical wells, directional wells and horizontal wells None of the existing drilling techniques can predict the reservoir interface, resulting in the inability of drilling tools to guide the well trajectory to accurately traverse ...
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IPC IPC(8): E21B47/13E21B49/00
CPCE21B49/00E21B47/13
Inventor 杨震肖红兵李运升李翠张海花
Owner CHINA PETROCHEMICAL CORP