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- Title
普光高含硫碳酸盐岩气田开发调整关键技术.
- Authors
曾大乾; 游瑜春; 李中超; 宿亚仙; 张 睿; 姜淑霞; 石志良; 纪喜; 刘国萍; 彭 松; 王丹丹; 李 辉; 李玉丹; 余启奎; 李 童
- Abstract
Sinopec has successfully developed two major high-sulfur gas fields in Sichuan Basin, namely Puguang and Yuanba, but since the beginning of the "Fourteenth Five-Year Plan", the development of both gas fields has entered the middle and later stages of stable production and faces new technical challenges such as increasingly severe water invasion and sulfur deposition, complex distribution of remaining gas, and low formation pressure in some gas wells. In order to realize stable gas field production and improve the gas recovery factor, this paper systematically researches the key technologies and methods for gas field development adjustment by taking the Puguang gas field as an example. In addition, the key technologies are dissected from five aspects, including fine reservoir characterization and modeling, fine characterization and potential tapping of remaining gas, water control, sulfur control, and pressurized production. And the following research results are obtained. First, the porositypermeability characteristics of different types of reservoir space in reef-flat carbonate reservoirs are revealed, the facies controlled + seismic controlled" fine reservoir modeling technology is developed, and the spatial distribution of reservoir heterogeneity is characterized precisely. Second, five remaining gas distribution models are established for the Puguang gas field. It is determined that the reservoir heterogeneity in the Puguang gas field controls the distribution of remaining gas in the pure gas area, and the distribution of the remaining gas in the water-invaded area is small scaled and scattered, which is controlled by the perfection of well patterns and the distribution of high-permeability zones. Correspondingly, different types of remaining gas potential tapping technologies are formed. Third, it is proposed to apply the water control countermeasures of "production control at the higher part of the structure where the gas region located in and comprehensive application of drainage and plugging at the lower part of the structure" in the Puguang gas field, and consequently the uniform advancement of water invasion front is realized. Fourth, it is confirmed that reservoir sulfur deposition mainly occurs in the near-well zone (less than 6 m), which can cause a maximum decrease in permeability by 70%-80% (skin factor increases by 6.5-12 times). It is experimentally verified that the acid refracturing has a better sulfur control effect than the sulfur solvent. Fifth, a multi-phase flow productivity evaluation method for gas wells considering water production and sulfur deposition is established, and the potential, amplitude, timing, and method of gas field pressurization are determined. In conclusion, the implementation of the key technologies for the development adjustment of Puguang the other high-sulfur carbonate gas field ensures its stable production since the "14th Five-Year Plan". The research results are of great guidance and reference to the development adjustment of the other high-sulfur gas fields in China.
- Subjects
SICHUAN Sheng (China); CHINA; MULTIPHASE flow; GAS distribution; CARBONATE reservoirs; WATERFRONTS; PRODUCTION control; GAS wells; GAS fields
- Publication
Natural Gas Industry, 2023, Vol 43, Issue 9, p102
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2023.09.010