Measurement method for contribution rate of commingled production crude oil capacity

Abstract

A measurement method for contribution rate of commingled production crude oil capacity utilizes the capillary gas chromatography hydrocarbon finger-print detection technology of the crude oil, performs analysis on the finger-print composition of hydrocarbon in the crude oil at the level of molecule, and reflects the composition and content of the hydrocarbon compound in the crude oil; measurable differences exist among the concentration of composition of each layer of crude oil (such as isoalkane, cyclane, and the like) in the chromatograph hydrocarbon finger-print. According to the method, the multiple inlets crude oil capillary gas chromatography hydrocarbon finger-prints are used together to deduce backwards to obtain the yield contribution ratio of crude oil of each layer, single-layered crude oil finger-print library (using single-layered test oil sample) is not required, and the method is economical and practical, and is simple and convenient to operate.

Description

technical field [0001] The invention relates to a method for measuring the production capacity contribution rate of joint production crude oil, belonging to the technical field of petroleum development. Background technique [0002] In order to save costs and maximize benefits, in the development and production of oilfields, production wells are mostly exploited in the mixed manner of several oil layers. Only by understanding the layered productivity contribution of mixed production wells can we scientifically determine which oil layer needs water injection, which oil layer needs steam injection or take other production stimulation measures, and then guide the scientific and efficient development of oil and gas fields. At present, the commonly used methods for layer productivity monitoring include production logging, layer testing, and tracer tracking. The disadvantages of these methods are high cost, long period, and are not suitable for low flow rate and channeling oil wel...

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Problems solved by technology

[0004] The above method has the following deficiencies: first, it is necessary to set up a single-layer crude oil fingerprint library (using a single-layer test oil sample), and perform full-oil chromatographic analysis on the single-layer crude oil respectively. crude oil samples

This requires more economic investment and makes the operation more complicated; second, in a work area, for the crude oil fingerprints of the same reservoir, there may be differences in the crude oil fingerprints determined by different oil wells, and the crude oil fingerprints in the fingerprint library are It is determined by an oil well, and with the exploitation of oil and gas, the crude oil in the same oil layer due to internal differentiation will cause differences in the properties of the crude oil extracted in different periods, which will directly affect the calculation accuracy of its contribution to the combined production of crude oil; Third, it is still not mature enough to solve the problem of joint mining with more than three floors; Fourth, although some technologies have achieved good application results, they still have disadvantages such as high cost and complicated operation

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