Research and Application of New Technologies for Expanding Storage and Increasing Production in Carbonate Reservoirs

doi:10.11885/j.issn.1674-5086.2024.04.18.03

Abstract

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

CLC Number:

TE344

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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