Researches On Dynamic Monitoring System For Yingmai 7-19 Condensate Reservoirs In Tarim Basin

Ying Mai 7-19 condensate reservoir contains bottom oil(black oil). During oilfield development, black oil and condensate often come out at the same time. As the common logging method cannot solve the problem of productivity contribution of gas reservoir and oil reservoir, it brings difficulty to the measurement of oil and gas output,the calculation of the use of proven reserves of oil and gas resources, and the study on the surplus resources. Based on the establishment of chromatographic fingerprint technique’s monitoring system, the production technical difficulties can be solved.This paper have research on Ying Mai 7-19 bottom oil of condensate reservoir bottom oil and condensate, which contains the Light hydrocarbon fraction, chromatographic features of total hydrocarbon, composition and distribution of biological marker, the absolute concentration of chemical compound and so on. Combination with combination experiment, research of condensate reservoir dynamic monitoring chart and development of production capacity contribution processing software, achieved the following recognition:1. Mixed condensate with bottom oil, the output oil has no strictly corresponding relationship with crude oil density and composition. That is to say, the relative bottom oil content cannot be simply judged by the color of the output oil.2.Condensate reservoir contains bottom oil have Light hydrocarbon componentdifference with condensate. The feature of toluene/nC7 of bottom oil is higher relatively explainedbottom oil has experienced evaporation and fractionation effect;3. Condensate total hydrocarbon composition characteristic has big difference with bottom oil, The feature is an important basis for the hydrocarbon fingerprinting technology to study the proportion of bottom oil.;4. Condensate and bottom oil has very similarbiomarkers composition, reflect the correlation of heavy hydrocarbons in origin, that is the origin of condensate heavy hydrocarbons and bottom oil is almost the same.5. The distribution of n-alkanes mole fraction also explains, condensate’s bottom oil has experienced gas washing or evaporative fractionationobviously, the relative abundance of bottom oil of low carbon number n-alkanes decreased obviously, the reflectthe light fraction of the earth’s significance is almost the same.6. The formation period of bottom oil and condensate reservoir has difference, the charge of bottom oil is early, condensate reservoir is secondary condensate reservoir.7. The relative abundance of low carbonisoparaffin was significantly higher in condensate reservoir, while bottom oil’s abundances of high carbon number compounds were higher than that of condensate. The fingerprint feature has big difference between bottom oil and condensate,with the change of proportion, the difference shows a regular gradient.8. With the change of proportion,the variation of alkane parameters is roughly the same, linear correlation is presented overall.9. According to the combination experiment analysis, the differences of different single-source oil and commingled oils has certain additivity.10. A mathematical model is established in the relationship between Ying Mai 7-19 condensate reservoir single-source oil and commingled well oils of chromatographicfingerprint and commingled well oils output capacity of each Single layer, with the chromatographic peaks characteristic of computer software technology linear least squares method mathematical models can produce productivity software of contribution,Comparative analysis of the result of mathematical model and experimental data, the relative error is 1-5% on average, It is indicated that the single layer capacity contribution of the two well production wells can be calculated by gas chromatography fingerprint technology.