Petroleum Reservoir Evaluation and Development ›› 2022, Vol. 12 ›› Issue (6): 945-950.doi: 10.13809/j.cnki.cn32-1825/te.2022.06.014

• Comprehensive Research • Previous Articles    

Liquid production splitting of multi-layer mining considering multiple factors

ZHOU Haiyan1(),ZHANG Yunlai1,LIANG Xiao1,ZHANG Jilei1,XU Yanan1,LIU Jizhu2   

  1. 1. CNOOC Ltd., Tianjin Branch, Tianjin 300459, China
    2. Exploration Department, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China
  • Received:2021-10-25 Online:2022-12-26 Published:2022-12-02

Abstract:

The application of multi-layer mining technology in reservoir is gradually extensive. Production splitting and stratification evaluation are regarded as important links, which affect the accuracy of dynamic reserve calculation and the reliability of development policy adjustment. However, the conventional formation coefficient(Kh) production splitting method still fails to fully consider the dynamic factors such as reservoir connectivity and pressure difference. Based on darcy formula and other seepage theory, a new production splitting method is put forward to clarify the role of the production of each layer in the development of reservoir. This method introduces the concept of “permeability contribution rate”, which is defined as the ratio of permeability of each layer to the sum of all permeability of high, middle and low layers, and comprehensively considers the relationship between permeability contribution rate, water content, and splitting coefficient, and proposes the production splitting of multi-layer mining with different permeability layers. Based on the research of eight groups of different permeability levels and polynomial regression calculation, the mathematical model for splitting of liquid production is established for different permeability layers considering water content, permeability range and other parameters. Through the comparison between the numerical simulation and the experimental test results, the splitting mode has small error and high accuracy, which can meet the needs of field application.

Key words: multi-layer mining, production splitting, numerical simulation, Darcy formula, seepage theory

CLC Number: 

  • TE312