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- Title
天然气资源开发利用水平调查评估现状与建议: — 以中国石油天然气集团有限公司为例.
- Authors
崔永平; 陈京元; 季丽丹; 郭建林; 庚 勐
- Abstract
To investigate the current exploitation and utilization level of natural gas resources and promote the saving and efficient utilization of oil and gas resources, this paper takes China National Petroleum Corporation (CNPC) as the sample to carry out the related survey and evaluation activities and analyze the overall development situations of its natural gas business. In addition, the natural gas "three-ratio" (recovery factor, recovery ratio and utilization ratio of syngenetic and associated resources) indexes of its 12 subordinate oilfield companies were analyzed. On this basis, the evaluation results were obtained and the related suggestions were proposed. And the following research results were obtained. First, CNPC's natural gas "three-ratio" indexes are overall better. Second, CNPC's natural gas recovery factor during 2016-2019 averages 59.02 % and the average natural gas recovery factor of five types of gas reservoirs exceeds the minimum standard. Third, CNPC's natural gas recovery ratio during 2016-2019 averages 98.16 % and the natural gas recovery ratio of each oilfield reaches the standard. Fourth, CNPC'S utilization ratio of syngenetic and associated resources during 2016-2019 is different. The utilization ratio of condensate oil averages 99.92% (up to the standard), the utilization ratio of hydrogen sulfide averages 96.21%, the utilization ratio of carbon dioxide averages 66.97% and that of helium gas ranges from 30% to 50%. CNPC'S utilization ratio of hydrogen sulfide during 2018-2019 reaches the standard. Finally, several suggestions on the "three-ratio" index system were proposed. First, adjust the extra low permeability gas reservoirs into the category of tight gas reservoir and introduce two new types, i.e., shale gas and coalbed methane. Second, decrease the minimum recovery factor standard of gas reservoirs with inactive water drive by 10% to 60%, increase the minimum recovery factor standard of low permeability gas reservoirs by 10% to 40%, and increase the minimum recovery factor standard of extra low permeability gas reservoirs (tight gas reservoirs) by 10% to 24%. Third, the recovery ratio of natural gas is defined as the percentage of the sum of commodity volume and self consumption in the industrial production of natural gas, which is more accordant to the field actuality. Fourth, syngenetic and associated resources are different in the content and utilization value, so it is not suitable to adopt the "one-size-fits-all" measure to pursue the high utilization ratio of all syngenetic and associated resources, and it is suggested to cancel the evaluation standard of the utilization ratio of syngenetic and associated resources. Fifth, oilfield companies shall establish the normal-state standard survey and evaluation system of natural gas exploitation and utilization level and include the "three-ratio" index evaluation in the annual routine work of natural gas development.
- Subjects
CHINA National Petroleum Corp.; GAS reservoirs; SHALE gas; WORKING gases; NATURAL gas production; EVALUATION utilization; NATURAL gas; OIL shales; COALBED methane
- Publication
Natural Gas Industry, 2021, Vol 41, Issue 3, p90
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2021.03.010