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Annular space logging process of neutron gamma-ray logging instrument for well gadolinium-injecting labelling

A gamma logging tool and neutron technology, applied in wellbore/well components, earth-moving drilling, etc., can solve the problems of inability to analyze and evaluate formations, not knowing the contribution of formation tracers, etc., to reduce logging. Well frequency, easy detection, good high temperature stability

Inactive Publication Date: 2008-08-13
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

Without knowing the contribution of tracers in each depth formation to the peak value, effective analysis and evaluation of each formation cannot be carried out

Method used

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  • Annular space logging process of neutron gamma-ray logging instrument for well gadolinium-injecting labelling

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Embodiment Construction

[0027] Such as figure 1 As shown, the annular space electron gamma logging tool includes a magnetic locator 1, a neutron gamma ray measurement part 2 connected with the magnetic locator 1, and a joint connected with the neutron gamma ray measurement part 2 from top to bottom 6 and the source bar 5 that is connected with joint 6, 241 Am-Be neutron source and source chamber 4; the lower end of the neutron gamma ray measurement part 2 is provided with a gamma probe 3, the inside of the neutron gamma ray measurement part 2 is an electronic circuit part, and the source rod 5 is connected with a 241 The source chamber 4 of the Am-Be neutron source is connected. The maximum outer diameter of the annular space electron gamma logging tool is 28.0mm.

[0028] Adopting the above-mentioned annular space electron gamma logging tool, the present invention provides a method for crossing annular space logging with a neutron gamma logging tool for gadolinium injection tracing between wells, ...

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Abstract

The present invention relates to a method for executing annular space log by neutron gamma-ray log instrument in tracing gadolinium between wells, includes trifluoro three ethylene diamine gadolinium complex compound taken as tracer, confects water solution of trifluoro three ethylene diamine gadolinium complex compound, and injects the solution into water injection well. Gathering water solution sample from effluent in each oil production well, and measuring gadolinium content with mass spectrography in sample; before gadolinium does not arrive at oil well, annular space log is executed and well logging baseline is obtained; when gadolinium content of the sample is upwardly mobile, oil well is in annular space log by using annular space neutron gamma-logging instrument; variation curve of gamma count in layers changed with times is measured, obtaining water-bearing saturation degree, obtaining horizontal distribution of remaining oil saturation, obtaining longitudinal distribution of remaining oil saturation and obtaining horizontal distribution of each reservoir remaining oil saturation. The method decreases well logging number, does not affect oil production, can obtain horizontal distribution and longitudinal distribution of remaining oil saturation, and can obtain horizontal distribution of each reservoir remaining oil saturation.

Description

technical field [0001] The invention relates to a method for logging through an annular space with a neutron gamma logging tool for gadolinium injection tracing between wells. Background technique [0002] At present, the interwell tracer test in my country is to inject a fluid slug that is compatible with the injected fluid and dissolve the tracer into the injection well, trace the injected fluid, and then use the same fluid to displace the tracer. The agent slug marks the trajectory of the injected fluid. This method of using tracers to track the movement of injected fluids in oil layers, and by detecting the production performance characteristics of tracers on production wells to study oil layer characteristics and production performance is the cross-well tracer technology. It is a method to directly measure the characteristics of oil reservoirs. The tracer concentration detected by the production wells breaks through the curve, which feeds back information about the char...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B49/08
Inventor 庞巨丰
Owner XI'AN PETROLEUM UNIVERSITY
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