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- Title
页岩气水平井生产规律.
- Authors
郭建林; 贾爱林; 贾成业; 刘 成; 齐亚东; 位云生; 赵圣贤; 王军磊; 袁 贺
- Abstract
With the gradual advancement of shale gas development and the continuous increase of development scale in China, analyzing the production data of gas wells appropriately and evaluating the production laws of in-service wells provides the basis and guarantee for the evaluation of interim development effects and the formulation of next development schemes. In this paper, the production data of the shale gas horizontal wells in six shale gas development blocks of North America and China's national shale gas demonstration areas (including Changning–Weiyuan Block and Zhaotong Block) were analyzed, and the normalized production decline curves were established for different blocks by virtue of the hyperbolic–exponential hybrid decline model. Then, the variation trends of initial production and decline rates of shale gas wells were discussed. Finally, a fast evaluation method for the estimated ultimate reserve (EUR) of shale gas horizontal well was developed. And the following research results were obtained. First, in the early stage of development, the average initial production of shale gas horizontal wells presents an increasing trend year after year, but the distribution of the initial production is different. Then, the average initial production of gas wells varies in a platform-like mode. And in the later stage, a trend of decline year after year occurs. Second, the hyperbolic–exponential hybrid decline model is better applicable to the production decline analysis of shale gas horizontal wells in China and North America. The gas wells put into production in different years in the same block are similar in production decline laws. Third, the production decrement of the Changning Block in the first three years is 55%, 38% and 33% respectively, which are close to that of Fayetteville Block in North America. Whereas, the production decrement of Weiyuan Block in the initial stage of production is 63%, 46% and 37% respectively, which are much higher than that of the 5 blocks in the North America. Fourth, the EUR of gas wells is positively correlated with the cumulative production of the first year (Q1), and it is generally 2–5 times the Q1. As for the EUR/Q1 of gas wells, the Woodford Block is the highest, the Changning Block is equivalent to Barnett, Eagle Ford, Fayetteville and Haynesville Blocks, and the Weiyuan Block is relatively lower.
- Subjects
NORTH America; FAYETTEVILLE (Ark.); CHINA; EAGLE Ford Shale; SHALE gas; GAS wells; GAS analysis; HORIZONTAL wells; EVALUATION methodology; VIRTUE; RECEIVER operating characteristic curves
- Publication
Natural Gas Industry, 2019, Vol 39, Issue 10, p53
- ISSN
1000-0976
- Publication type
Article
- DOI
10.3787/j.issn.1000-0976.2019.10.006