Study of asphaltene deposition from Tahe crude oil

作     者：CHEN Chaogang GUO Jixiang AN Na REN Bo LI Yaguang JIANG Qingzhe 

作者机构：China University of Petroleum Key Laboratory of Shale Gas ExplorationMinistry of Land and ResourcesChongqing Institute of Geology and Mineral Resources Northwest Oilfield Branch Engineering and Technology Institute of Sinopec 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2013年第10卷第1期

页      面：134-138页

核心收录：

学科分类：081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 

基　　金：National High Technology Research and Development Program of China(No.2013AA064301) National Natural Science Foundation of China (No.51274210) 12th National Science and Technology Major Project of the Ministry of Science and Technology of China (No.2011ZX05049-003-001-002) 

主　　题：Onset of asphaltene flocculation turbidity method crude oil composition temperature,bubble point pressure borehole 

摘      要：Borehole blockage caused by asphaltene deposition is a problem in crude oil production in the Tahe Oilfield, Xinjiang, China. This study has investigated the influences of crude oil compositions, temperature and pressure on asphaltene deposition. The asphaltene deposition trend of crude oil was studied by saturates, aromatics, resins and asphaltenes （SARA） method, and the turbidity method was applied for the first time to determine the onset of asphaltene flocculation. The results showed that the asphaltene deposition trend of crude oil by the turbidity method was in accordance with that by the SARA method. The asphaltene solubility in crude oil decreased with decreasing temperature and the amount of asphaltene deposits of T739 crude oil （from well T739, Tahe Oilfield） had a maximum value at 60℃. From the PVT results, the bubble point pressure of TH 10403CX crude oil （from well TH10403CX, Tahe Oilfield） at different temperatures can be obtained and the depth at which the maximum asphaltene flocculation would occur in boreholes can be calculated. The crude oil PVT results showed that at 50,90 and 130 ℃, the bubble point pressure of TH 10403CX crude oil was 25.2, 26,4 and 27.0 MPa, respectively. The depth of injecting asphaltene deposition inhibitors for TH10403CX was determined to be 2,700 m.