Experimental investigation on the steam injection profile along horizontal wellbore

Dong, Xiaohu; Liu, Huiqing; Zhai, Yue; Wang, Changjiu; Chen, Zhangxin; Liu, Dongqing

doi:10.1016/j.egyr.2020.01.005

Cited by 20 publications

(1 citation statement)

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“…Steam conformance is a key factor in steam-based recovery processes of heavy oil reservoirs [1][2][3][4][5]. Due to different sedimentation backgrounds in the formation, different sedimentation results in different rock types and properties, and the difference in lithology causes the reservoir heterogeneity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Steam Conformance Evolution in Vertical-CSS and Optimization of Profile Improvement Agents

Guo

2022

Applied Sciences

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Production performance of heavy oil deposits in Xinjiang oilfield developed by vertical-well cyclic steam stimulation (CSS) is increasingly challenged by reservoir heterogeneity, which is comprised of original sedimental heterogeneity and steam-induced heterogeneity. In order to understand the impacts of sedimental heterogeneity and high-speed steam injection to steam conformance, and strategies to maximize steam swept volume, a series of experiments were designed and implemented. Three-tube coreflooding experiments were performed to study the steam displacement dynamics under heterogeneous conditions, and a high-temperature plugging agent was developed. The coreflooding experiments indicate that the injection conformance deteriorates once the steam breakthrough occurs in a high-permeability tube, leaving the oil in the medium and low permeability tubes being surpassed. The optimized plugging agent could resist high temperatures over 260 °C and its compressive strength was 13.14 MPa, which is higher than maximal steam injection pressure. The plugging rate of high permeability core was greater than 99.5% at 220–280 °C with a breakthrough pressure gradient over 25 MPa/m. The field test validated its profile improvement feasibility with cyclic oil, 217.6% of the previous cycle. The plugging agent optimized in this study has significant potential for similar heterogeneous reservoirs.

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