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Method for continuouslly monitoring gas well-boring state under well

A gas drilling and state technology, used in wellbore/well components, measurement, earthwork drilling, etc., can solve the problems of slow instrument response, high production cost, large volume, etc., and achieve the effect of ensuring safety and efficiency

Inactive Publication Date: 2007-09-05
SOUTHWEST PETROLEUM UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still a series of problems in the application of gas drilling: (1) In the case of gas drilling, when water is produced downhole, "mud bags" often appear in the well, resulting in poor chip removal in the well, jamming of drilling tools, and downhole explosions (2) In the case of a large amount of downhole water output in gas drilling, "fluid accumulation" often occurs in the well, that is, formation water cannot be removed in time and accumulates; (3) in the drilling of oil and gas reservoirs, in order to prevent For underground explosion accidents, nitrogen, combustion tail gas and other fire-resistant inert gases are commonly used for drilling wells. The lower the oxygen content of nitrogen and combustion tail gas produced on site, the higher the production cost; and under certain circumstances, the corresponding underground fire has a limit oxygen content
This type of instrument cannot be effectively used in gas drilling to monitor downhole blockage, water output, rock breaking efficiency, and downhole fire. At the same time, the instrument also has problems such as slow response, large volume, and high cost.

Method used

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  • Method for continuouslly monitoring gas well-boring state under well
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  • Method for continuouslly monitoring gas well-boring state under well

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Embodiment approach

[0014] (1) The normal dust drilling state of gas drilling. In the normal dust drilling state, no oil, gas and water are produced in the formation, and the downhole rock breaking is normal and the rock cleaning is smooth. At this time, according to the injected gas volume and drilling speed, combined with the monitoring values ​​of the upstream pressure sensor 13, the midstream pressure sensor 14 and the momentum sensor 22, the return gas flow rate and mixing density can be calculated. The removal state and quantity of granular rock debris are monitored by the broadband sound sensor 18, and the dust state, quantity and color are observed by the all-weather observation camera system 6 at the outlet. If the addition of the dust-reducing water 21 is stopped, the effect will be better. Open the cuttings sampler 16 intermittently to obtain geological sand samples.

[0015] (2) Well plugged drilling state of gas drilling. If there is obvious blockage in the annular space during dri...

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Abstract

A continuous monitor method for oil well includes: sampling the gas at the spigot line; after de-dust and de-water procedure, the gas flow through a flow meter and monitor system to the analysis instrument; the analysis data is collected and sent to a PC module, so to realize auto-monitor, analysis and comparison.

Description

technical field [0001] The invention relates to a method for monitoring, analyzing and judging the downhole state of gas drilling used in the oil and gas exploitation industry to ensure the safety and high efficiency of drilling. A continuous monitoring method for the downhole state of gas drilling, which is also applicable to hydrology, geothermal, mineral resources Gas drilling in other fields. Background technique [0002] At present, gas drilling refers to a drilling method in which gases such as air, natural gas, nitrogen, and combustion tail gas are used as circulating media. Gas drilling can greatly increase drilling speed, reduce costs and shorten drilling cycle. Gas drilling can also effectively overcome downhole complex situations such as lost circulation and shale collapse. The use of gas drilling in oil and gas reservoirs can well protect the oil and gas layers, increase the discovery rate in exploration wells, and increase the productivity of oil and gas wells...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00E21B47/002
Inventor 孟英峰李永杰陈一健张军
Owner SOUTHWEST PETROLEUM UNIV
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