抗干扰液压换层分采技术及其状态控制规律

1.延安大学 石油工程与环境工程学院,陕西 延安 716000; 2.中国石油冀东油田,河北 唐山 063004

液压换层技术; 分层采油管柱; 压力差异平衡机构; 深度差异平衡机构

Exchangeable layer technology with the characteristics of anti-interference and state control formula
HE Ya-wei1,SONG Xian-min2 ,YANG Di2,WANG Fang2

(1.College of Petroleum and Environmental Engineering,Yanan University,Yanan 716000,China; 2.Petrochina Jidong Oil Field,Tangshan 063004,China)

hydraulic exchangeable layer technology; Separate layer production string; the mechanism to eliminate the influence of formation pressure difference; the mechanism to eliminate the influence of depth difference

备注

针对目前分采技术在层间压力差异大、深度差异大、高低压层纵向上交错分布的油井上应用过程中所存在的换向动作混乱不易识别、控制压力受层间差异影响大等问题,提出了最优分层采油理念,即各分采段的井口控制压力不受层间的压力及深度差异影响的抗干扰液压换层操作理念和将交错分布的低压油层挑出来的组合开采理念,研制了抗干扰液压换层控制器,设计了井下平衡压力差异和深度差异、地面判断控制器动作状态、地面打压控制各段开关状态等机构,分析了消除各段压力差异和深度差异的平衡原理,最终形成了抗干扰液压换层分采技术,实现了井口打压换向操作连续高效、准确可证、不受层间压力差异、深度差异影响的目标,满足了对井下所有段各种开启状态任意组合进行控制需要,并建立了既可预测、也可控制井下各段控制器开关状态的井口输入信号与井下全组合开关状态对应的数学关系,并在现场成功实施了5口井。

In order to solve the problems of interlayer contradiction and interference,such as the inter layer pressure,huge depth difference,the unidentified disorder high and low level longitudinal movement,and control pressure differences affected by different layers.This paper puts forward the optimal concept of separate layer production.It is based on the conversion layer interference hydraulic operating concept,in another word,the control pressure of the well head is not bound by the layer pressure,depth difference and the concept of combining the picked up staggered low pressure layers.It developed the anti-interference hydraulic controller,and designed the mechanism of balanced down hole pressure difference and depth difference,the operating state of ground action controller,the ground pressure control switch state and other mechanisms.Meanwhile it analyzed the balancing principle of eliminating layer pressure,depth difference and eventually formed a hydraulic layer separate recovery technology with the characteristics of anti interference,realizing the goal of such as the wellhead hydraulic operation being continuously efficient,accurate and provable,and not bound to the impact of the layer pressure difference,depth difference; meeting the need to control both all underground sections open and any combination,and establishing a mechanism that can both predict and control the switch state of each layer controller and forming the corresponding mathematical relationships with the switch state down hole,and had successfully implemented five wells.