Dynamic Analysis of Steam Stimulation of Horizontal Wells in the Offshore Heavy Oil Reservoir with Bottom Water

Abstract

The horizontal well steam soaked in C heavy oil reservoir with bottom water located in Bohai has the problems of low sweep coefficient, unrecoverable large-area oil reservoirs and uneven steam injection profiles. Since steam recovery is used as a step-down development method, the reservoir energy will decrease as the throughput cycle increases. Under the influence of pressure difference, the bottom-bottom water continues to migrate to the production well, causing the bottom-bottom water to eventually invade the wellbore, affecting production. To this end, dynamic analysis of horizontal well development is needed to better understand the production characteristics of horizontal wells. This article mainly analyzes the typical oil production-water content characteristics, recovery water rate, oil-gas ratio, production model characteristics and other indicators, compares the production characteristics of different wells, divides different typical production modes, and analyzes the production effect. The main influencing factors, at the same time, aimed at the implementation of the two-nitrogen foam leveling wells on site, from the aspects of oil production, gas-oil ratio, etc., compared with the wells without measures, and analyzed the corresponding reasons. There are two factors that reduce the amount of oil produced during the cycle. First, since the density of steam is less than that of crude oil, under the influence of gravity, steam is caused to flow to the top of the oil layer. The leading edge of the steam is inclined and does not reach the lower middle oil layer. Second, since the viscosity of the steam is lower than that of the crude oil, the steam rushes. This limits the range of steam heating and reduces the degree of mobilization in the longitudinal direction of the reservoir. The research results in this paper can better guide the development of such reservoirs.

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.