Mechanism and Application Effect Evaluation of Nitrogen Flooding in Mahu Tight Conglomerate

doi:10.11885/j.issn.1674-5086.2021.03.23.02

Abstract

Abstract: In order to solve the problem of rapid production decline caused by horizontal well + volume fracturing in Mahu tight conglomerate reservoir, nitrogen injection was carried out in laboratory and field to enhance oil recovery. The EOR potential of Block M is evaluated by gas drive phase behavior, miscibility and oil displacement effect. The experimental results show that the solubility of nitrogen in crude oil is small that the displacement mechanism mainly depends on its own expansibility, and that the minimum miscible pressure of nitrogen is 62.3 MPa, so it is difficult to achieve miscible flooding in Block M. A pilot test of nitrogen injection was carried out in Block M of Mahu Oilfield, and good results were obtained. The effective characteristics of oil production, oil pressure, gas oil ratio and nitrogen concentration were studied and evaluated; the change of production before and during gas injection for well group is analyzed. The increase of a total of 1 953 t of oil is obtained. Finally, based on the geological and engineering data, the main controlling factors affecting gas injection effect are systematically evaluated, which proves that horizontal well + volume fracturing nitrogen injection is a feasible technology to enhance oil recovery in tight conglomerate reservoir.

Key words: Mahu Oilfield, tight conglomerate, EOR, pilot test, minimum miscibility pressure, impact assessment

CLC Number:

TE341

LI Haonan, SONG Ping, ZHU Yating, TAN Long, ZHANG Jigang. Mechanism and Application Effect Evaluation of Nitrogen Flooding in Mahu Tight Conglomerate[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(5): 203-211.

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