高导流自支撑酸化压裂室内实验研究

发布时间：2018-01-19 04:15

本文关键词： 酸岩反应酸蚀裂缝自支撑面支撑导流能力塔河油田　出处：《特种油气藏》2017年04期 　论文类型：期刊论文

【摘要】：针对常规酸化压裂刻蚀形成的点状支撑裂缝在高闭合应力条件下导流能力快速衰竭的问题,设计了一种新型的自支撑酸化压裂方式,实现酸蚀裂缝的面状支撑。运用室内酸蚀裂缝导流能力测试技术,测定了闭合应力为20~90 MPa条件下的自支撑裂缝导流能力。利用三维形貌扫描手段,评价了自支撑模式的缝面刻蚀特征和支撑高度。结果表明,自支撑模式下裂缝支撑高度提高约4倍,在闭合应力为50 MPa条件下酸蚀导流能力提高了41.8%,裂缝支撑的有效性、稳定性得到彻底改善。自支撑酸化压裂技术对于延长深井、超深井酸化压裂措施有效期以及提高深层油气藏开发效果具有重要意义。
[Abstract]:A new type of self-supporting acidizing fracturing method was designed to solve the problem of rapid depletion of flow conductivity under high closed stress of punctate braced fractures formed by conventional acidizing fracturing. The surface support of the acid corrosion crack is realized. The test technology of the conductivity of the acid corrosion crack is used in the laboratory. The conductivity of self-supporting fracture at closing stress of 20 ~ 90 MPa was measured. The etching characteristics and height of self-supporting fracture surface were evaluated by means of three-dimensional topography scanning. The height of fracture brace in self-bracing mode is increased by about 4 times, and the conductivity of acid corrosion is increased by 41.8 times under the condition of closing stress of 50 MPa. The fracture bracing is effective. The self-supporting acidizing fracturing technology is of great significance for prolonging the period of validity of acidizing fracturing measures in deep wells and for improving the development effect of deep oil and gas reservoirs.
【作者单位】：页岩油气富集机理与有效开发国家重点实验室;中国石化石油工程技术研究院;
【基金】：国家科技重大专项“缝洞型碳酸盐岩油藏高效酸压改造技术”(2011ZX05014-006)
【分类号】：TE357.2
【正文快照】： 0引言塔河油田某区奥陶系碳酸盐岩油藏埋深约为5 500~7 000 m,地层压力系数为1.07,储层类型主要为裂缝型,区块约75%的新井需要酸化压裂改造才能投产。生产过程中,约1/4的酸化压裂井出现供液不足、产量快速衰竭的问题。分析表明,该区块地层能量较弱,开采过程中地层压力快速降低

【相似文献】