气水交替驱技术在稠油油藏中的应用

Application of WAG technology in heavy oil reservoir.

目前辽河油田的中深层稠油油藏大多数主力区块已进入蒸汽吞吐的中后期 ,蒸汽驱是蒸汽吞吐后提高采收率最有效的接替技术。对于不适合转蒸汽驱的稠油油藏如何提高采收率 ,在曙光油田杜 66块曙 43 5 3 0井组进行了气水交替驱的先导试验。试验已实施近 1年 ,井组产液量、产油量明显增加 ,油井动液面上升 ,油藏能量得到补充 ,初步取得了较好的效果。对于已处于吞吐中后期、油藏能量亏空严重而不适宜转蒸汽驱的普通稠油油藏来说 ,注入烟道气等非凝析气体进行气水交替驱是一种可供选择的开采方式。图 2参

At present, most middle deep heavy oil reservoirs in Liaohe oil field are at middle or late stage of cycle s team stimulation(CSS), facing the challenge of the converting development meth ods. Steamflooding is the most effective alternative technology for enhancing oil recovery after CSS. How to improve re covery factor of reservoirs that are not suitable for converting to steamfloodin g after CSS become a key issue. In order to find an effective method to develop those reservoirs, water alternating gas (WAG) pilot test was carried out in Shu 43 530 well group, Block Du66, Shuguang oil field. For almost one year pilot t est, oil production and liquid production of the pattern have been remarkable in creased, and liquid level of producers has been also increased. At the same time , reservoir pressure has been built up. The result of the pilot is better. Gener ally, WAG technology is a type of available method for heavy oil reservoirs that are not suitable for converting to steamflooding after CSS.