Geology-engineering integration practices throughout well lifecycle in ultra-deep complex gas reservoirs of Kelasu tectonic belt, Tarim Basin

doi:10.3969/j.issn.1672-7703.2019.02.004

Abstract

Abstract: The gas-rich Kelasu structural belt is the primary option for increasing reserves and production in the Tarim Basin. The geological and engineering conditions in the belt are extremely complex as a result of strong orogenic movements, represented by deep burial (VD 7000-8000 m), high temperature (130-190℃), high pressure (116-136 MPa), high in-situ stress (130-180 MPa), low porosity (4%-8%), low permeability (0.01-0.1 mD), thick gravel (5500 m), thick salt-gypsum (4500 m), and large dip angle (87°). These factors bring great challenges to the safe and economical exploration and development. In order to get fast drilling and production, guided by the geology-engineering integration, the multi-disciplinary research team worked in an innovative and integrated manner to figure out the solutions to ultra-deep complex gas reservoir development with higher rate, productivity and quality. By combining precise prediction of key zones, customized design of drill bit and oil-based drilling fluid system, the all sections were drilled in a safe and rapid mode. According to sweet spots prediction, fracture evaluation and classification, an optimal fracturing stimulation process was established based on fracturability of natural fractures. Considering formation and fluid properties and working conditions, a system barrier was designed for ensuring wellbore integrity. By virtue of improving geology-engineering integration practices, the drilling period of an ultra-deep well reduced from 336 days during the 12th Five-Year Plan period to 277 days in 2017, the average single-well productivity increased by 4-5 times, and the well integrity was improved. Thus, the geology-engineering integration is a technical guarantee for safe and economical development of ultra-deep complex gas reservoirs in the Kelasu structural belt.

Key words: Kelasu tectonic belt, ultra-deep complex gas reservoir, geology-engineering integration, organization mode, practice, higher rate, higher productivity, higher quality

CLC Number:

Tian Jun, Liu Hongtao, Teng Xueqing, Cai Zhenzhong, Zhang Hui, Cao Lihu. Geology-engineering integration practices throughout well lifecycle in ultra-deep complex gas reservoirs of Kelasu tectonic belt, Tarim Basin[J]. China Petroleum Exploration, 2019, 24(2): 165-173.

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