• 综合研究 •

碳酸盐岩三重介质气藏NPI产量递减分析研究

1. 1.西南石油大学石油与天然气工程学院,四川 成都 610500
2.宁波华润兴光燃气有限公司,浙江 宁波 315000
3.中国石油西南油气田公司勘探开发研究院,四川 成都 610041
• 收稿日期:2020-08-14 出版日期:2021-12-26 发布日期:2021-12-31
• 作者简介:付天宇（1996—）,男,在读硕士研究生,主要从事试井分析与产量递减分析方面的研究。地址：四川省成都市新都区西南石油大学国家重点实验室,邮政编码：610500。E-mail: 527645356@qq.com
• 基金资助:
国家科技重大专项“深层碳酸盐岩气藏高效开发技术”(2016ZX05015-003)

Normalized pressure integral production analysis of triporate-uniphase parallel inter-porosity flow model

FU Tianyu1(),LIU Qiguo1,CEN Xuefang2,LI Longxin3,PENG Xian3

1. 1. Petroleum Engineering School, Southwest Petroleum University, Chengdu, Sichuan 610500, China
2. Ningbo China Resources Xingguang Gas Co., LTD., Ningbo, Zhejiang 315000, China
3. Research Institute of Exploration and Development, CNPC Southwest Oil & Gasfield Company, Chengdu, Sichuan 610041, China
• Received:2020-08-14 Online:2021-12-26 Published:2021-12-31

Abstract:

Normalized Pressure Integral（NPI） Production Analysis is a kind of modern production decline analysis method which defines new parameters by integral. It can not only reflect the pseudo-steady state flow stage influenced by outer boundary, but also can reflect the unsteady state flow stage. In order to study the NPI production decline analysis method of carbonate reservoir, we established triporate-uniphase parallel inter-porosity flow model. In this model, fracture is the main flow channel and inter-porosity flow happens from cave to fracture and matrix to fracture. The bottom hole pseudopressure solution with considering the effect of skin factor of this model was obtained by Laplace transform and Duhamel principle. The NPI method curves were plotted by using normalized pressure integral method and Stehfest numerical inversion. And the curves can reflect the production performance of this model accurately. The storage ratio, inter-porosity flow coefficient, and dimensionless outer boundary radius were chosen to be sensibility parameter for sensibility analysis. The result shows that the storage ratio mainly influences the depth of depression on derivative curve and the inter-porosity flow coefficient mainly influences the time when inter-porosity flow stages happen. The skin factor just influences the dimensionless pseudopressure and dimensionless pseudopressure integral curves, while the dimensionless outer boundary radius will also influence the unsteady state flow stage of derivative of dimensionless pseudopressure integral curve.

• TE33