新型连续无污染冲砂装置的研制与应用

The research and application of the new-type continuous pollution-free sand washing device.

以往冲砂作业在接单根时必须停泵,停泵易出现沉砂卡管、增加用水量等影响冲砂质量的诸多问题。为此,研制了一种新型连续无污染冲砂装置。该装置由换向控制阀、井口自封和环阀换向总成组成,其特点是在冲砂过程中只需在地面改变外接三通阀的方向,便可在不停泵的情况下,任意添加油管,加长油管柱,从而实现不间断连续冲砂,提高了冲砂作业效率。30余口井的现场应用表明,该装置冲砂效果明显,后期生产良好,工艺成功率100%,降低了砂卡管柱的风险,提高了冲砂效率,减轻了冲砂液对地层和环境的污染。

To solve the problems in the previous sand washing,a new-type continuous pollution-free sand washing device was developed.The device consists of reversing control valve,wellhead BOP and reversing assembly of ring valve.It was characterized by free addition of tubing,lengthening tubing string,achievement of continuous sand washing,improvement of sand washing efficiency with no termination of pumping only by changing the direction of the circumscribed T-valve on ground in the process of sand washing.The application of the device to over 30 wells showed that its effect of sand washing was remarkable,the later-stage production was desirable and the technological success rate reached 100%.It reduced the risk of sand-stuck pipestring,improved sand washing efficiency and reduced the pollution of sand washing fluid to the formation and environment.