碳酸盐岩油藏扩储增产新技术的研究与应用

doi:10.11885/j.issn.1674-5086.2024.04.18.03

摘要/Abstract

摘要： 缝洞型碳酸盐岩油藏以原生孔隙及次生缝洞系统为主要储存空间，裂缝为油气渗滤通道，各缝洞体空间发育孤立，连通性较差，单井井控缝洞规模有限。哈拉哈塘油田因井控储量小导致长停、低效的油井占比已达41%，前期已尝试通过重复酸压、高压扩容注水进行治理，虽取得一定成效，但大部分井有效期短，治理后递减快，单独依靠酸压或扩容注水难以实现井控储量小的油井效益复产。针对这一问题，在研究前期储层改造方法的基础上提出了规模酸压+扩容注水的新方法，先行扩容注水在近井形成高压水带，开启地层的天然裂缝或者压开地层，之后通过酸压实现酸蚀缝长与酸蚀裂缝导流能力同步最大化的改造，沟通远井储集体，酸后直接大排量注水，进行超远距离的刻蚀，从而达到“造缝找洞”的目的。目前已实施3口井，增加动用地质储量46.04×10⁴ t，累增油4.72×10⁴ t，预计有效期累产油可达6.36×10⁴ t，为缝洞型碳酸盐岩油藏低效井扩储增产提供了一种经济有效的新方法。

关键词: 缝洞型碳酸盐岩油藏, 井控储量小, 规模酸压, 高压扩容注水, 扩储增产, 哈拉哈塘油田

Abstract: The primary pore and secondary fracture-cave system are the main storage spaces in the fracture-cave carbonate reservoir. The fractures are the infiltration channels for oil and gas. The spatial development of each fracture-cave body is isolated, with poor connectivity, and the scale of single well control fracture-cave is limited. The proportion of oil wells with long shutdowns and low efficiency in Halahatang Oilfield has reached 41% due to small well control reserves. In the early stage, attempts have been made to treat them through repeated acid fracturing and high-pressure expansion water injection, and have achieved some results, but with a short effective period and rapid after treatment decrease for most wells. It is difficult to achieve the recovery of oil wells with small well control reserves relying solely on acid fracturing or expansion water injection. Based on the research of reservoir transformation methods in the early stage, a new method of scale acid fracturing and expansion water injection is proposed to address this issue. First, forms a high-pressure water zone near the well through expansion water injection, opens natural fractures or fractures in the formation. Then, acid pressure is used to achieve simultaneous maximization of acid etched fracture length and acid etched fracture conductivity, communicating with distant well reservoirs. After acid fracturing, large displacement water injection is directly carried out for ultra long distance etching, thereby achieving the goal of“creating fractures and finding holes”. At present, three wells have been implemented, increasing geological reserves by 460 400 tons and cumulative oil production by 47 200 tons. It is expected that the cumulative oil production during the effective period can reach 63 600 tons, providing an economically effective new method for the expansion and production increase of inefficient wells in fractured carbonate reservoirs.

Key words: fracture cave type carbonate reservoirs, small well control reserves, scale acid pressure, high pressure expansion water injection, expand storage and increase production, Halahatang Oilfield

中图分类号:

TE344

陈利新, 王霞, 赵彬, 杨博, 蒋亚坤. 碳酸盐岩油藏扩储增产新技术的研究与应用[J]. 西南石油大学学报(自然科学版), 2026, 48(2): 98-106.

CHEN Lixin, WANG Xia, ZHAO Bin, YANG Bo, JIANG Yakun. Research and Application of New Technologies for Expanding Storage and Increasing Production in Carbonate Reservoirs[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(2): 98-106.

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http://journal15.magtechjournal.com/Jwk_xnzk/CN/Y2026/V48/I2/98

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