针对油田进入高含水采油期后,部分站场因低产量伴生气低,回收利用难度大而存在燃烧排放或无效放空的生产现状,研制了一种基于双U型管气液分离、气体过滤、阀前调压稳压和止回阀的组合式回收装置.对组合式回收装置进行了功能测试,并在17座站场现场应用,供气系统压力平稳,加热炉正常运行,实现了低气油比站场5755 m3/d(标况)伴生气100％回收,取代天然气使用,年节约燃料支出115.6万元,有利于油田安全环保、节能减排与清洁生产.

针对现有桥塞存在的技术问题,设计了适用于水平井的可捞可钻桥塞.对这一桥塞的结构进行了介绍,对其工作原理进行了分析,并给出了技术参数与特点.对这一可捞可钻桥塞进行了地面试验,确认其对于水平井具有良好的适用性.在现场三口水平井应用可捞可钻桥塞,采油含水率分别降低50.6％、8.9％和53.2％,确认应用效果良好.

Hydraulic friction occurs during the circulation of fluid in the drillpipe and in the annulus. To investigate the frictional pressure loss of eccentric drillpipe in horizontal wells, by analyzing the influence of rotating drillpipe, axial fluid flow and moving cutting bed on pressure loss, the interface friction in near-horizontal annulus was studied. The empirical relationship between the eccentricity of drillpipe and hydraulic friction coefficient as a function of RPM and flow rate was established. The analysis of single-phase flow data shows that the pressure loss increases with the increase of the RPM. The secondary flow generated by the rotation of the drillpipe is not the only cause of the pressure loss. The variation of the eccentricity of the drillpipe with the drilling rate and flow rate has a considerable influence on the pressure loss. The larger the eccentricity of the drillpipe, the smaller the friction coefficient is. With the particles (cuttings), the friction coefficient decreases with the increase of the RPM. The study can provide references for people involved in drilling engineering, and can promote the development of drilling hydraulics analysis technology in China.

王窑长6油藏自1983年开始勘探评价,是低渗透油藏最早开发的区块.近年随着开发时间延长,地下渗流场日趋复杂,含水上升速度加快,平面剖面水驱不均,开发效果变差.为扩大水驱波及体积,注水井调剖成为治理的主要手段之一,而常规堵水存在有效期短、堵水后爬坡压力高等问题,开展新技术迫在眉睫.本文通过研究水驱后渗流、储层特征变化及微球调堵机理,在长6油藏现场实施,注水井爬坡压力得到控制,平面水驱改善,剖面动用程度提高,开发效果变好,为后期低渗透油藏的开发提供了重要的技术储备.

A sound pressure displacing system is crucial to the effective development of low permeable oil reservoirs while water flooding parameters,flooding methods and the selection of integrated injection-production monitoring measures which could affects displacing system are closely correlated to multiple pressure monitoring data in the process of flooding exploration.In the development lasting as long as 20 some years,Wangyao district the earliest block in Ansai Oil Field to implement flooding exploration had gradually developed an empirical method with pressure monitoring data its main source while also combining updated info to determine adjustment measures which posed great significance in instructing development of Ansai Oil Field and lent experiences to similar reservoir explorations.

采用自然重力沉降法很难从水中去除油污和悬浮物,同时采出水腐蚀性强,并有一定的含氧量,加速了设备的腐蚀,为此研制了NDAF-50型氮气溶气气浮除油装置。该装置主要由高效管式反应器、高压溶气系统、斜板溶气浮选机组成。采出水进入管式反应器,与助剂、饱和溶气水混合后进入浮选机,浮选机内部的波纹斜板使气泡和污油、悬浮物的结合与水迅速分离,上浮到水面利用刮渣机刮走,大颗粒悬浮物在重力的作用下沉降至浮选机底部,通过自动排污阀排走,出水自动溢流出浮选机。现场应用表明,当进口含油、悬浮物质量浓度在不大于400mg/L的范围内变化时,处理效果基本不受影响;在一定范围内,气水比越大,处理效果越好。