Method of predicting deep oil-gas layer based on benzene and toluene abnormality of well drilling back gas

A technology for oil and gas formation and slurry return, which is applied to measurement devices, earth-moving drilling and production, wellbore/well components, etc. It can solve the problems of no application, interference, and application effect limitation, and achieve sensitive measurement methods, rapid measurement, and convenient sampling. Effect

Inactive Publication Date: 2009-12-16
TSINGHUA UNIV
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Problems solved by technology

However, due to the low detection sensitivity of the existing gas chromatography for ethane, propane, and butane, some areas are also affected by CO with a concentration more than 1000 times higher than that of ethane, propane, and butane. 2 Therefore, oil and gas geochemical exploration in drilling is mainly to find oil and gas layers by measuring the methane in the return slurry gas
However, because the source of methane is not unique, it is often interfered by biogenic methane, and the application effect is limited
[0003] Benzene and toluene are a new class of oil and gas geochemical indicators proposed in recent years. They have been used in formation water and soil gas, but have not been applied to gas return while drilling.

Method used

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  • Method of predicting deep oil-gas layer based on benzene and toluene abnormality of well drilling back gas
  • Method of predicting deep oil-gas layer based on benzene and toluene abnormality of well drilling back gas
  • Method of predicting deep oil-gas layer based on benzene and toluene abnormality of well drilling back gas

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Embodiment Construction

[0018] This method contains the following steps in sequence:

[0019] Slurry-returning gas samples are collected while drilling → high-sensitivity measurement of benzene and toluene content → data analysis (combined with formation depth and structural traps) → prediction of the approximate depth of the underlying deep oil layer (or gas layer).

[0020] 1. Collection of return slurry gas while drilling:

[0021] When the sample is to be sent to the laboratory for measurement, use two needles, a soft sealing rubber stopper and a glass bottle and follow the sampling steps below to drain water and take air: first fill the glass bottle with saturated saline and seal it with a soft sealing rubber Seal the mouth of the bottle with a stopper; then use two needles at the same time, one of the needles is sealed with a hose, which is connected to the outlet of the micro-motion pump, and then put the hose connected to the inlet of the micro-motion pump into the At the entrance of the...

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Abstract

The invention relates to a method for predicting underlying deep oil and gas layers by using benzene and toluene in return slurry gas while drilling, and belongs to the technical field of drilling oil and gas geochemical exploration. The sensitivity instrument measures the concentration of benzene and toluene in the return slurry gas at different depths under the seabed surface, analyzes the measured data in combination with the formation depth and structural traps, and then predicts the approximate depth of the underlying deep oil layer or gas layer based on this. Compared with the traditional method, the invention has the advantages of good stability, strong measurement result specificity, high correlation, convenient sampling and the like.

Description

Technical field: [0001] The invention relates to a method for predicting underlying deep oil and gas layers during drilling, and belongs to the field of drilling oil and gas geochemical exploration. Background technique: [0002] At what depth will there be oil and gas shows in the oil and gas wells being drilled? Is there any oil and gas layer in the deep part? Is it worth continuing to drill? These problems need to be solved in time on the drilling platform. Existing drilling oil and gas geochemical exploration mainly uses the abnormal content of methane, ethane, propane and butane in the return slurry gas as an index of oil and gas display. Because methyl ethyl propylene butane is the main component in petroleum and it is gaseous, it will form anomalies above oil and gas reservoirs through diffusion, and it is the "messenger" (messenger) indicating oil and gas reservoirs. However, due to the low detection sensitivity of the existing gas chromatography for ethane, prop...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B49/00G01N30/88
Inventor 马万云陈瓞延刘海生
Owner TSINGHUA UNIV
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