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井下节流工艺可降低站场建设成本,稳定气井生产,减少温室气体排放。川西气田从2006年开始引入井下节流工艺,但丛式井开发模式造斜点浅、井斜角大以及流体节流后温度必须大于水合物形成温度的理论,导致井下节流工艺应用程度不高,且因维护工艺存在不足,造成井下节流器投放失效率达22%,打捞失败率达35%。为克服以上技术难题,基于地层加热和流体冲蚀理论,优化节流器设计下深,解决了大斜度井实施井下节流工艺难的问题;优选了多胶筒棘刺节流器,制定了合理的井下节流器维护制度:活动式打捞周期为半年1次,固定式打捞周期为1年1次,提出地面安全防护措施:油压→针阀→油嘴套→井口高低压截断阀→地面流程,从而提高节流器可靠性,解决了井筒卡堵、打捞困难。2016年川西气田共对12口井实施井下节流,工艺施工成功率100%,打捞成功率100%。
Downhole throttling process can reduce the station construction costs, stabilize gas well production and reduce greenhouse gas emissions. The gas field in west Sichuan began to introduce the downhole throttling process in 2006. However, the development mode of the cluster wells is shallow with shallow bevel, high inclination angle and the temperature after fluid throttling must be greater than the hydrate formation temperature, resulting in the application of downhole throttling process High, and due to inadequate maintenance of technology, resulting in failure of downhole flow rate of 22%, salvage failure rate of 35%. In order to overcome the above technical problems, based on the theory of formation heating and fluid erosion, the design of deep throttle was optimized to solve the problem of difficulty in implementing downhole throttling technology in high deviated well. A multi-collet thorn restrictor was optimized and developed Reasonable downhole maintenance system: active fishing cycle for six months, fixed fishing cycle for 1 year 1 times, put forward the ground safety measures: oil → needle → nozzle sets → wellhead high and low pressure cut-off valve → ground Process, thereby increasing the reliability of the throttle to solve the wellbore blocking, salvage difficulties. In 2016, a total of 12 wells were throttled down well in the western Sichuan gas field, with a success rate of 100% and a successful recovery rate of 100%.