MODEL AND METHOD OF WELL TEST ANALYSIS FOR WELLS WITH VERTICAL FRACTURE

• Published in: Applied mathematics and mechanics Vol. 26; no. 5; pp. 571 - 578
• Main Author: 郭大立 曾晓慧 赵金洲 刘慈群
• Format: Journal Article
• Language: English
• Published: Department of Computer Science, Southwest Petroleum Institute, Chengdu 610500, P.R. China%Department of Petroleum Engineering, Southwest Petroleum Institute, Chengdu 610500, P.R. China%Department of Postgraduate, Southwest Petroleum Institute, Chengdu 610500, P.R. China%Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Science, Langfang, Hebei 065007, P.R. China 01-05-2005
• Subjects: 垂直压裂; 多孔介质流体力学; 数学模型; 油井测试; 自动匹配法; automatic matching method; vertical fracture; model; well test; fluid flow through porous medium
• ISSN: 0253-4827; 1573-2754
• DOI: 10.1007/bf02466330

Based on the flow mechanism of hydraulic fractured wells, through integrating linear-flow model and effective well-radius model, a new model of well test analysis for wells with vertical fracture was established. In the model, wellbore storage, the damage in the wall of fracture and all kinds of boundary conditions are considered. The model is concise in form, has intact curves and computes fast, which may meet the demand of realtime computation and fast responded well test interpretation. A new method to determine effective well radius was presented, and the correlation between effective well radius and the fracture length, fracture conductivity, skin factor of fracture was given. Matching flow rate or pressure tested, the optimization model that identified formation and fracture parameters was set up. The automatic matching method was presented by synthetically using step by step linear least square method and sequential quadratic programming. At last, the application was also discussed. Application shows that all of these results can analyze and evaluate the fracturing treatment quality scientifically and rationally, instruct and modify the design of fracturing and improve fracturing design level.