Dominating Factors on Well Productivity and Development Strategies Optimization in Hongqian Heavy Oil Block of Xinjiang Oilfield

Abstract

Hongqian heavy oil reservoir has the characteristics of complex connection relationship in the old area of steam injection, developed advantageous channels and great difficulty in regulation. In the process of fire drive development, there are problems such as gas channeling, high gas injection pressure and difficult to form effective connection between injection and production wells, which have a great impact on the production of fire drive. In order to clarify the single well production and development optimization technology of fire drive in Hongqian heavy oil high viscosity block, the effects of crude oil viscosity, gas injection speed and injection production pressure difference on fire drive production are carried out by using one-dimensional fire-flooding physical simulation experimental device. Based on more than 700 production wells, the gas injection parameters of production wells in the test area and the relationship between wellhead pressure and production in the test area are systematically analyzed, The main control factors of single well productivity are defined, and the technical countermeasures for fire drive development optimization are put forward. The research shows that crude oil viscosity is an important factor affecting the production of single well of fire drive, and increasing the fluctuation area of fire drive is the key to improve the productivity of single well of fire drive. On site, fire line control methods such as high-temperature and high-yield gas control, parameter regulation, steam injection effect and liquid extraction diversion in undeveloped areas were adopted, and more than 50 wells were implemented, with an effective rate of more than 85%.