采油井模块化分层流体取样与压力测试技术

为了准确掌握老油田高含水开采后期各油层分层压力及流体参数等开发动态数据,提出并研发了具有模块化、全电控、快捷化等特点的模块化分层取样与测试技术,并进行了室内测试和现场试验。模块化分层取样与测试系统由地面控制系统、井下电源、排液泵、电控锚定器、电控封隔器、电控取样器、磁定位短节、终端短节、适配管缆、快速接头等多个功能模块构成,室内测试证实各模块性能参数均达到了设计要求。系统井下功能模块耐压35 MPa,耐温85℃,电控封隔器胶筒耐压差10 MPa以上,电控锚定器锚定力大于6.9 t,并可在意外情况下强制解卡,排液泵排量0.8 m³/d,扬程500 m,电控取样器能够满足3腔各500 mL取样需求。吉林油田现场试验表明,该系统能够实现井下单个生产层段快速封隔与自验封,完成分层压力恢复测试,利用排液泵可将上下封隔器间以及近井地带的混合液体排出,获取被测层段的地层真实流体样品,提高老油田产层认识水平,为开发方案调整优化、油层改造等提高采收率措施提供重要依据。

Modular zonal fluid sampling and pressure testing technology for production well

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 were carried out.The modular zonal sampling and testing system is composed of 10 functional modules,namely ground control system,downhole power supply,drainage pump,electronically controlled anchor,electronically controlled packer,electronically controlled sampler,magnetic positioning sub,terminal sub,adapter cable,and quick connector etc.Indoor tests have confirmed that the performance parameters of each module meet the design requirements.The downhole function modules of the system can withstand the pressure of up to 35 MPa and temperature of up to 85℃.The rubber cylinder of the electronically controlled packer can withstand the pressure difference of above 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 m³/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 production interval downhole,as well as pressure building test layer by layer.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.