大气顶油藏气窜规律与全寿命开发策略

Gas Channeling Pattern and Full-Life Development Strategy for Oil Reservoir with Large Gas-Cap

为明确气顶气驱油藏生产规律,提高该类油藏开发效果,以渤海锦州A油田大气顶油藏为例,通过岩心、古地貌、试井和生产监测等资料的综合应用,分析影响油井气窜的主要因素,得出3类气窜模式的划分界限。研究认为,气窜对油井产能影响较大;气顶指数、储层非均质性和水平段垂向位置是影响气窜规律的主要因素。通过提出分气窜模式、分开发阶段全寿命开发策略,锦州A油田大气顶油藏实现连续7 a年产油量大于100×104m^3/a,综合气油比小于800 m^3/m^3,预计可提高采收率3.1个百分点。该研究为同类大气顶油藏的开发提供了一定的借鉴。

Jinzhou A Oilfield in Bohai is taken to clarify and improve the production performance of gas-cap drive oil reservoir.Core test,paleogeomorphology,well test,production monitoring and other data are comprehensively used to analyze the key factors influence gas channeling and determine the classification boundaries of 3 gas channeling modes.Research indicates that the oil well production capacity is greatly dependent on gas channeling.The key factors affect gas channeling include gas-cap index,reservoir heterogeneity and lateral wellbore position.The fulllife development strategies for different development stages are proposed by gas channeling pattern classification.The oil production of Jinzhou A Oilfield with large gas-cap exceeds 100×104 m3/a for 7 years,the composite gasoil ratio is less than 800 m3/m3 and the predicted recovery factor can be enhanced by 3.1 percentage points.This research could provide certain reference for the development of similar reservoirs with large gas-cap.