Research on the Enhanced Oil Recovery Technique of Horizontal Well Volume Fracturing and CO 2 Huff-n-Puff in Tight Oil Reservoirs.

Autor: Bai M; School of Petroleum Engineering, Northeast Petroleum University, 163318 Daqing, Heilongjiang Province, China., Zhang Z; School of Petroleum Engineering, Northeast Petroleum University, 163318 Daqing, Heilongjiang Province, China., Chen Q; Mechanical and Electrical Information Engineering College, Daqing Normal University, 163318 Daqing, Heilongjiang Province, China., Weifeng S; The Tenth Oil Production Plant, Daqing Oilfield Co., Ltd., 163311 Daqing, Heilongjiang Province, China., Du S; School of Petroleum Engineering, Northeast Petroleum University, 163318 Daqing, Heilongjiang Province, China.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2021 Oct 19; Vol. 6 (43), pp. 28485-28495. Date of Electronic Publication: 2021 Oct 19 (Print Publication: 2021).
DOI: 10.1021/acsomega.1c00893
Abstrakt: The low oil productivity of tight oil reservoirs is mainly caused by poor reservoir physical properties such as low porosity and permeability, a small pore and throat ratio, and bad well connectivity, which lead to bad water injection capability and rapid pressure decline for the reservoir. In this paper, an enhanced oil recovery technique for tight oil reservoirs is proposed by combination of horizontal well volume fracturing and CO 2 huff-n-puff to improve the reservoir physical properties and increase the flow capability of crude oil. In the initial reservoir development stage, the precise horizontal well trajectory and reservoir volume fracturing scale are designed by analyzing the distribution of sand body thickness and the oily sedimentary facies. The micro-seismic tracking technique is also used to monitor the fracture elongation. When the reservoir energy cannot satisfy the economic limit of oil productivity, the CO 2 huff-n-puff technique is applied to increase the reservoir energy quickly. After the precise fracturing technique is used in tight oil Block X, the average oil production rate of six fractured horizontal wells increases by 5 ton (1 ton = 7.33 bbl) at the initial production stage, and the effective oil production increase life lasts for 32 months. When the reservoir energy is supplemented using the CO 2 huff-n-puff technique, the oil production rate of pilot experiment well SP-1 increases from 1.9 to 12.8 ton with a cumulative oil increase of 1333.8 ton.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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