摘要
川东石炭系气藏广泛地分布于四川盆地东部，已成为主力气藏。在勘探开发过程中气层受到伤害，自然渗透率下降，为提高天然气产能，大量地采用了压裂酸化技术措施。压裂酸化工艺技术的水平，影响到天然气增长的效果。为了确保压裂酸化工艺技术的有效作用，文章着重分析了四川盆地东部地区石炭系气位压裂酸化的效果及影响酸化效果的主要因素，压裂酸化技术的发展趋势。提出了对于构造轴部、高点的井，一般宜采用每米厚度注入约１．５ｍ３酸量的常规酸化，清除近井带的污染，待输气到中、后期再进行深度酸化对翼部、端部的井和孔隙度差的井，进行常规酸化后，可立即采用深度酸化工艺，以改变渗流条件；在钻井、完井、开采、修井作业中全方位地采用油气层保护措施；深入开展压裂酸化的评层选井工作；完善有利于压裂酸化的井身结构；进一步加强压裂酸化工作等六项建议。
Chuandong Carboniferous gas reservoirs are widely distributed in the east port of Sichuan Basin.The gas bearing formation damages produced in the course of exploration and development make the natural permeability reduced. A lot of fracture acidizing technical measures are applied to raise the capacity of sas production. The results, influence factors and developing trend of fracture acidizing in the Carboniferous gas reservoirs in the east part of Sichuan form are emphatically analysed. Six suggestions are proposed out as followings:①for the wells at the structural axis and culmination high, it is suitable injecting about 1. 5 m3/m conventional acidizing fluid to eliminate the pollutions in the near wellhole zone and the depth acidizing will be done in the meduim and fat6r periods of gas producing;②for the wells at the flanks-ends with worse porosity, after conventional acidizing, depth acidizing technology can be immediately used to change the percrolation flow conditions;③the protective measures of oil-gas bearing formations should be thoroughly used in the operation course of drilling, well completion, production and well workover ;④ deeply conducting the jobs of evaluating formations and selecting wells ;⑤perfeCting the hole texture being favourable for fracture acidizing;⑥strengthening the jobs of fracture acidizing.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1995年第1期50-52,共3页
Natural Gas Industry
关键词
石炭纪
工艺
油层酸化
压裂酸化
Sichuan Basin, Carboniferous period, Gas reservoir, Fracturing acidizing, Result,Analysis, Technology.
