Hydrate reservoir physical properties response and high-pressure gas-water reverse penetration during deepwater oil and gas cementing

Authors

ZHENG Mingming, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; Key Laboratory of Tectonics and Petroleum Resources Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China; Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China
WANG Xiaoyu, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
ZHOU Kerui, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
WANG Kai, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
WANG Zhilin, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
DONG Gang, PowerChina Northwest Engineering Corporation Limited, Xi'an 710061, China
WEI Meng, State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China
LIU Tianle, Engineering Research Center of Rock-Soil Drilling & Excavation and Protection, Ministry of Education, China University of Geosciences(Wuhan), Wuhan 430074, China
JIA Dongyan, PowerChina Northwest Engineering Corporation Limited, Xi'an 710061, China

Abstract

Well cementing is an important stage during the process of energy extraction. When deep-water oil and gas cementing encounters hydrate formations, the hydration heat of cementing slurry will cause hydrate decomposition in the reservoir near the borehole wall and reverse penetration of high-pressure gas-water. To reduce and avoid the adverse effects of hydrate decomposition, it is critical to clarify the physical response of hydrate reservoirs and the law of high-pressure gas-water reverse penetration under different cementing conditions. In this paper, a two-dimensional cementing numerical model is established according to the SH2 exploration well of GMGS-1 project in Shenhu area in the north of the South China Sea, and numerical simulation software TOUGH+HYDRATE is used to reproduce cementing slurry penetration and hydration process. Then, the response law of reservoir properties near the borehole wall during the process is analyzed, and the critical conditions for high-pressure gas-water reverse penetration under the conditions of different cementing pressure difference and heat release rate are obtained. The idea of "continuous stage simulation" is innovatively adopted to solve the dynamic heat release issue of cementing slurry. The results show that the process before initial setting of cementing slurry can be divided into three stages: induction, decomposition and secondary hydrate formation. The penetration behavior mainly occurs during the pressure holding period, and the penetration depth basically no longer increases after the holding pressure is removed. The temperature rise caused by the exothermic heat of hydration leads to the massive decomposition of hydrates, and the resulting high-pressure gas-water migrate around. After the holding pressure is released, the high-pressure gas-water present a more obvious tendency to penetrate toward the annulus. The higher the hydration heat release rate is, the smaller the cementing pressure difference is, and the greater the possibility of gas-water reverse penetration, and the earlier it will occur. For shallow hydrate reservoirs, reducing the heat of hydration of cementing slurry can effectively reduce the occurrence of reverse invasion and improve cementing quality. For deeper reservoirs, higher cementing pressure difference can be used within the fracture pressure range. This study offers a good reference for parameters optimization during the cementing process in hydrate formations.

Keywords

natural gas hydrates, deepwater oil and gas cementing, physical properties response, dynamic heat source, continuous stage simulation, reverse penetration of high-pressure gas-water, South China Sea

DOI

10.3969/j.issn.1001-1986.2021.03.015

Recommended Citation

ZHENG Mingming, WANG Xiaoyu, ZHOU Kerui, et al. (2021) "Hydrate reservoir physical properties response and high-pressure gas-water reverse penetration during deepwater oil and gas cementing," Coal Geology & Exploration: Vol. 49: Iss. 3, Article 16.
DOI: 10.3969/j.issn.1001-1986.2021.03.015
Available at: https://cge.researchcommons.org/journal/vol49/iss3/16

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