Downhole while-drilling gas-logging testing device

Abstract

The invention provides a downhole while-drilling gas-logging testing device comprising a hydraulic module, a gas detecting module, a control module and a mud impulse generator. Through moving of a piston in the hydraulic module, annulus drilling fluid flows into the hydraulic module, the gas detecting module measures the content of methane gas in the annulus drilling fluid, and the concentration of the methane gas in a stratum is determined according to the measurement value; gas concentration data are transmitted to the control module, the control module processes the data transmitted by thegas detecting module and transmits the data needing to be uploaded to a ground system to the mud impulse generator, and the mud impulse generator converts data signals needing to be uploaded to the ground system into mud impulse signals and transmits the mud impulse signals to the ground system; and the ground system interprets the mud impulse signals and then obtains the uploaded data. Accordingto the downhole while-drilling gas-logging testing device, downhole gas parameter detection can be achieved in real time and online, and the accuracy of a tested result is improved.

Description

technical field [0001] The invention relates to the field of oil and gas exploration and development, in particular to a downhole gas logging while drilling testing device. Background technique [0002] The traditional gas logging technology collects the gas (including methane, carbon dioxide and hydrogen sulfide and other mixtures) in the drilling fluid returned to the surface, measures its material composition, and indirectly evaluates the formation. However, the drilling fluid needs to go through a long annular pipeline (with different drilling depths, the length of the pipeline is different, generally as long as several kilometers) to return from the destination layer to the surface. Relevant information; at the same time, during the flow of drilling fluid back to the ground through the annular space, relevant environmental conditions such as temperature and pressure change dynamically with the flow of drilling fluid in the pipeline, and the dissolved gas in the drilling...

AI Technical Summary

Problems solved by technology

However, the drilling fluid needs to go through a long annular pipeline (with different drilling depths, the length of the pipeline is different, generally as long as several kilometers) to return from the destination layer to the surface. Relevant information; at the same time, during the flow of drilling fluid back to the ground through the annular space, relevant environmental conditions such as temperature and pressure change dynamically with the flow of drilling fluid in the pipeline, and the dissolved gas in the drilling fluid may also flow During the conversion to free state, part of the gas will enter the degasser with the drilling fluid for degassing, but some gas may rise from the drilling fluid to the ground and escape directly into the air through the liquid surface, affecting subsequent gas detection data the accuracy of

[0003] In recent years, the requirements for drilling speed and efficiency have become higher and higher, and the requirements for gas analysis and safety have become more and more stringent. Traditional gas logging technology has been difficult to meet the needs of oil and gas exploration and development.

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