Modular zonal fluid sampling and pressure testing technology for production well  

作　　者：XU Jianguo YANG Qinghai YI Peng HOU Ze JIA Weite FU Tao ZHANG Zonglin YUE Qingfeng 

机构地区：[1]Jilin Oilfield Oil&Gas Engineering Research Institute,Songyuan 138000,China [2]PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China [3]Jilin Oilfield Xinmu Production Plant,Songyuan 138000,China [4]Daqing Oilfield Production Engineering Research Institute,Daqing 163453,China

出　　处：《Petroleum Exploration and Development》2022年第2期438-447,共10页石油勘探与开发（英文版）

基　　金：Supported by the Project of Basic Science Center of National Natural Science Foundation of China (72088101);Major Project of CNPC (2021ZG12);National Key R&D Program/Key Project of Intergovernmental International Scientific and Technological Innovation Cooperation (2018YFE0196000);Major Scientific and Technological Project of PetroChina Jilin Oilfield Company (JY21A2-12)。

摘　　要：To accurately obtain development dynamic data such as zonal pressure and fluid parameters of each oil layer in the late development stage of a high water-cut old oilfield, a modular zonal sampling and testing technology with the characteristics of modularization, full electronic control and rapidity was proposed and developed. Lab testing and on-site testing was carried out. The modular zonal sampling and testing system is composed of 10 functional modules, namely ground control system, downhole power supply module, drainage pump, electronically controlled anchor, electronically controlled packer, electronically controlled sampler, magnetic positioning sub, terminal sub, adapter cable, and quick connector. Indoor tests have confirmed that the performance parameters of each module meet the design requirements. The downhole function modules of the system can withstand pressures up to 35 MPa and temperatures up to 85 ℃. The rubber cylinder of the electronically controlled packer can withstand a pressure difference of more than 10 MPa. The electronically controlled anchor has an anchoring force of greater than 6.9 t, and can be forcibly detached in the event of an accident. The discharge pump has a displacement of 0.8 m;/d and a head of 500 m. The electronically controlled sampler can meet the requirement of taking 500 mL of sample in each of the 3 chambers. Field tests in Jilin Oilfield show that the system can realize rapid isolation and self-check of isolation of a certain production interval downhole, as well as layer-by layer pressure build-up test. The drainage pump can be used to discharge the mixed liquid between the upper and lower packers and near the wellbore to obtain real fluid samples of the tested formation interval. The data obtained give us better understanding on the pay zones in old oilfields, and provide important basis for development plan adjustment, reservoir stimulation, and EOR measures.

关 键 词：zonal sampling zonal testing MODULARIZATION full electronic control RAPIDITY enhanced oil recovery fluid sampling pressure testing 

分 类 号：TE311[石油与天然气工程—油气田开发工程]