Technical Approach for Improving the Field Application Result of ASP Flooding

doi:10.11885/j.issn.1674-5086.2018.04.22.01

Abstract

Abstract: The IV5~IV11 of Shuanghe Oilfield exhibit a temperature of 81℃, crude oil viscosity of 3.3 mPa·s, comprehensive water cut of 97.9%, and recovery rate of 53.3%, all of which manifest as typical characteristics of inefficient exploitation of aged oilfields by water flooding in eastern China. To improve the exploitation efficiency of the above-mentioned gas reservoirs and significantly increase their recovery rates, three key technologies were applied in conjunction, namely, the alkaline-surfactantpolymer(ASP) flooding with high displacement efficiency, well pattern arrangement for layer reconstruction with expanded swept volume, and profile control throughout the chemical flooding process with channeling prevention. Laboratory experiments and field applications showed that the integration of these three technologies introduced multiple synergetic effects, as the oil displacement efficiency was substantially increased in addition to the expanded swept volume, resulting in an increase in oil production and a decrease in water cut. As of December 2017, a 0.72 PV chemical system was injected into the IV5~IV11 layer. Consequently, oil production increased by 26.09×10⁴ t, peak water cut at the central area dropped from 97.9% to 90.2%, and daily oil production rose from 23.0 t to 106.1 t. Furthermore, while the recovery rate was increased by 10.2% at this stage, it is expected to finally increase by 14.2%.

Key words: recovery rate improvement, asp flooding, well pattern arrangement for layer reconstruction, profile control throughout chemical flooding, high temperature reservoir

CLC Number:

TE357

LI Yongtai, KONG Bailing. Technical Approach for Improving the Field Application Result of ASP Flooding[J]. 西南石油大学学报(自然科学版), 2019, 41(4): 113-119.

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