Experimental Study on Enhanced Oil Recovery of Shallow Super-Heavy Oil in the Late Stage of the Multi-Cycle Huff and Puff Process

Chunyu Hu, Jianqiang Tao (), Meng Feng, Qian Wang, Hui Cao, Hongmei Su, Junke Sun and Wenfeng Wang ()
Additional contact information
Chunyu Hu: Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, China
Jianqiang Tao: Xinjiang Xinchun Petroleum Development Co., Ltd., Sinopec, Dongying 257000, China
Meng Feng: Oil Test Company, Karamay 834000, China
Qian Wang: Research Institute of Petroleum Exploration and Development, Xinjiang Oilfield Company, PetroChina, Karamay 834000, China
Hui Cao: Exploration and Development Research Institute of Qinghai Oilfield Branch, China National Petroleum Corporation, Dunhuang 736202, China
Hongmei Su: Xinjiang Uygur Autonomous Region Coalfield Geology Bureau 156 Coalfield Geological Exploration Team, Urumqi 830009, China
Junke Sun: 1st Oil Plant of PetroChina Qinghai Oil Field Branch Company 816499, Dunhuang 736202, China
Wenfeng Wang: School of Geology and Mining Engineering, Xinjiang University, Urumqi 830017, China

Energies, 2024, vol. 17, issue 23, 1-13

Abstract: The shallow, thin super-heavy oil reservoir demonstrates certain characteristics, such as shallow reservoir depths, low-formation temperature, and high crude oil viscosity at reservoir temperatures. In the current production process, the central area of P601 is undergoing high-frequency huff and puff operations, facing certain problems such as decreasing production, low recovery rates, and rapid depletion of formation pressure. Through physical simulation experiments, the various elements of HDNS-enhanced oil recovery technology were analyzed. Nitrogen plus an oil-soluble viscosity reducer can improve the thermal recovery and development effect of super-heavy oil. With the addition of the viscosity-reducing slug, the recovery rate of steam flooding was 58.61%, which was 23.32% higher than that of pure steam flooding; after adding the 0.8 PV nitrogen slug, the recovery rate increased to 76.48%. With the increased nitrogen injection dosage, the water breakthrough time was extended, the water cut decreased, and the recovery rate increased. Nitrogen also plays a role in profile control and plugging within the reservoir; this function can effectively increase the heating range, increase steam sweep efficiency, and reduce water cut. So, the synergistic effects of steam, nitrogen, and viscosity-reducing agents are good. This technology enhances the development of shallow-layer heavy oil reservoirs, and subsequent development technologies are being compared and studied to ensure the sustainable development of super-heavy oil reservoirs.

Keywords: super-heavy oil reservoir; multi-cycle huff and puff; the viscosity of heavy oils decreases; reservoir conversion; enhanced oil recovery (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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