Analysis of Initial Productivity Evaluation Method for Horizontal Well in Offshore Block Oilfield

Abstract

Due to the short testing time and unstable productivity of horizontal wells in offshore fault-block oilfields, it is very important to evaluate the stable productivity of horizontal wells and the comprehensive correction coefficient of productivity by using limited horizontal well testing data. In this paper, the unsteady flow stage of horizontal wells is decomposed, and the productivity equations of vertical radial flow, linear flow and pesudo radial flow stage are obtained respectively. On this basis, the test time correction coefficients under different formation properties and horizontal well length conditions are plotted, unsteady productivity changes in horizontal wells under different fault conditions are compared and analyzed, the productivity correction coefficients under different fault conditions are obtained. The distance between well spacing fault and horizontal well is generally 0.2–1.0, its productivity correction coefficient is 0.68–0.85. The reliability of the charts are verified by testing data and production performance data of an offshore fault block oilfield. The methods and charts can effectively guide the determination of productivity of horizontal well testing method in offshore fault block oilfield.

Copyright 2019, IPPTC Organizing Committee.

This paper was prepared for presentation at the 2019 International Petroleum and Petrochemical Technology Conference in Beijing, China, 27–29, March, 2019.

This paper was selected for presentation by the IPPTC Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the IPPTC Technical Committee and are subject to correction by the author(s). The material does not necessarily reflect any position of the IPPTC Technical Committee, its members. Papers presented at the Conference are subject to publication review by Professional Team of Petroleum Engineering of the IPPTC Technical Committee. Electronic reproduction, distribution, or storage of any part of this paper for commercial purposes without the written consent of Shaanxi Petroleum Society is prohibited. Permission to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of IPPTC. Contact email: paper@ipptc.org.