徐深气田火山岩气藏高效开发难点及对策

Technical difficulties and countermeasures for the highly-efficient development of volcanic gas reservoirs in Xushen gas field

松辽盆地徐深气田火山岩气藏开发的难点在于:储层物性差异大,有效储层预测难度大;单井产能低,经济效益差;气藏普遍含边底水,出水治理难度大。针对这些难点,从气藏开发模式、开发井类别及出水治理措施等方面对该类气藏高效开发进行了探讨,并提出以下技术对策:采用以动用Ⅰ、Ⅱ类储层为主,利用高渗透部位气井开采低渗透部位储层;采用水平井开发提高单井产量;对不同的出水井类型采取对应的出水治理措施,使该气田能达到经济高效开发的目的。该方法和技术对类似的火山岩气藏开发具有一定的借鉴作用。

The difficulties in the developing volcanic gas reservoirs of the Xushen gas field in the Songliao Basin include ①a significant variance in petro-physical properties resulting in a big trouble in the effective reservoir prediction,②poor economic benefit due to very low single well production,and ③a big trouble in watering treatment because of edge and bottom water commonly threatening the gas reservoirs.To solve these problems,this paper discussed how to quickly and efficiently develop this type of gas reservoirs in aspects of development models,development well types,and watering treatment measures,and found out the best ways which are ①to mainly produce the reservoirs of type-Ⅰand type-Ⅱ,②to take advantage of the wells located in a high-permeability layer to recover gas from a low-permeability layer,③to adopt horizontal wells to enhance the single well production,and ④to adopt corresponding watering treatment measures according to different cases of wells with water breakthrough.This study will provide a reference for the development of similar volcanic gas reservoirs.