水平井套管固井滑套分段压裂完井存在问题及对策

Problems and measurements of sliding sleeve staged fracturing completionin casing cementing horizontal wells

董云龙 唐世忠 牛艳花 吕照鹏 王晓彬

DONG Yunlong TANG Shizhong NIU Yanhua LV Zhaopeng WANG Xiaobin

大港油田公司采油工艺研究院，天津　300280

Production Technology Research Institute of Dagang Oilfield Co., Tianjin 300280, China

大港油田低渗透难动用储量和非常规油气藏储量丰富，水平井分段压裂完井技术是经济、有效开发低渗透油藏、非常规油气藏的主要手段。为探索水平井分段压裂完井工艺的适应性，大港油田开展了裸眼封隔器分段压裂完井、套管固井滑套分段压裂完井、不动管柱水力喷砂射孔完井工艺试验应用，并形成了以套管固井+滑套分段压裂为主体的分段压裂完井工艺。该工艺具有固完井分段压裂一体化管柱、全通径、压裂作业连续等优点，能够缩短作业周期，后期出水层段可以关闭滑套进行堵水，但也存在投球易导致井筒生产堵塞、胶塞不碰压无法保证固井质量、与相邻井串通等问题，针对存在问题开展了分析评价，并提出解决对策，现场实施后基本实现了油井的正产生产，为此类分段压裂完井方式的下步规模应用奠定了基础。

The low permeability difficult-to-produce reserves and unconventional oil and gas reserve in Dagang oilfield is rich, and horizontal wells with staged fracturing completion technology is probably the mainly mean to economically and efficiently develop these reserves. In order to analyze the applicability of staged fracturing in horizontal well completion technology in Dagang oilfield, application trials of openhole packer staged fracturing completion, casing cementing sliding sleeve staged fracturing completion technology and hydraulic jet perforation completion with immovable string were conducted to form a new well completion technique, which take the casing cementing and sliding sleeve subsection fracturing as the main technology. The newly process has the advantages of integrated pipe column for well cementing, completion and staged fracturing, full size and fracturing operation continuous, which can shorten the working period and sliding sleeve can be closed for water blocking point in late water-producing layer. Meantime, there also presents some problems with this technique such as wellbore production plug caused by ball dropping, poor cementing quality because of rubber plug no pressure and adjacent wells connection. Aiming at the existing problems, analysis and evaluation were conducted, and solutions were proposed in this paper. Field application primarily realized normal production of oil wells, which provides foundation for the further scale application of the similar staged fracturing completion technology.