Practice and cognition of geology-engineering integration for the production increasing of HTHP ultra-deep tight gas reservoir in Tarim oilfield

doi:10.3969/j.issn.1672-7703.2018.02.006

Abstract

Abstract: The tight sandstone gas reservoir in Kuqa foreland area is the principal natural gas productivity construction block in Tarim Oilfield, and its natural productivity is low. In order to realize beneficial development, it is necessary to carry out stimulation to increase the production. The reservoir is characterized by ultra-depth, high temperature and high pressure, high earth stress, developed natural fracture and strong heterogeneity. It is mainly faced with the challenges that the production increasing mechanism is not defined clearly, effective technologies are deficient, well conditions are severe, stimulation situations are complex and large-scale stimulation operation is risky in safety. To deal with these challenges, Tarim oilfield carries out a series of researches. First, it insists on geology-engineering integration, sets up a multi-disciplinary production increasing integration team and builds up the integrated working mode innovatively. Second, it coordinates domestic and foreign technical force by means of the open market cooperation mechanism. Third, by virtue of technological resource integration, the reservoir is further recognized and the production increasing mechanism is clarified. And accordingly the production increasing concept of fracture network stimulation aimed at activating natural fractures is determined, the technologies of fracture network acid fracturing and fracture network fracturing are developed innovatively, and the stimulation technology optimizing strategy based on the fracturing property of natural fracture is established. Fourth, based on the understandings of well condition and stimulation behaviors, high-pressure fracturing truck unit and large-bore completion string are prepared and two sets of weighted fracturing fluids and one dedicated acid corrosion inhibitor are developed to ensure the large-scale stimulation. The production increasing mode of geology-engineering integration is developed and improved continuously in practice. And the developed key technologies have been applied in 76 wells, whose single-well average production is increased by 3.28 times. The research results provide the technical support for the beneficial development of tight sandstone gas reservoir in Kuqa foreland area.

Key words: high temperature and high pressure, tight, natural fracture, geology-engineering integration, market cooperation mechanism, technological resource integration, fracture network acid fracturing, fracture network fracturing, production increasing

CLC Number:

Zhang Yang, Yang Xiangtong, Teng Qi, Xu Yonghui, Xue Yanpeng, Xu Guowei, Li Wei, Peng Fen. Practice and cognition of geology-engineering integration for the production increasing of HTHP ultra-deep tight gas reservoir in Tarim oilfield[J]. China Petroleum Exploration, 2018, 23(2): 43-50.

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