Abstract: Closed swabbing units for oil and gas well safety allow no liquid filtrated and no associated gas leaked from the wellhead in the process of swabbing to meet the HSE requirements. The wellhead part of this unit is composed of air controlled stuffing box, wireline centralizer, and anti-pulling-out device. The wellbore part is composed of sink bar connected with wireline, safety connector and efficient hydraulic swab. Application of air controlled stuffing box and anti-pulling-out device can keep the wellhead closed in the swabbing process and prevent wireline from broken owing to inappropriate operation. The field application indicates that this unit is reasonable in structure and stable in functions with the swabbing capacity raised to 3-4.5m³ from 0.3-0.45m³, 10 times as high as the original capacity. The sealing capacity is desirable under the wellhead pressure of 3.0 MPa, entirely satisfying the requirements on safety of closed swabbing for oil and gas wells.

Key words: oil and gas well, safety and sealing, swabbing, unit

摘要： 油气井安全密闭抽汲装置实现了抽汲排液过程井口无液体渗漏、无石油伴生气溢出,达到了安全环保的作业要求。该装置井口部分由气控防喷盒、钢丝绳扶正器、安全拔脱装置组成;井内部分由钢丝绳连接加重杆、安全接头、高效水力抽子组成,通过气控防喷盒、安全拔脱装置等的配套使用,既实现了抽汲过程中井口的密封,又避免了因操作不当引起的钢丝绳断脱等事故的发生。现场应用表明,该装置结构合理、性能稳定,将抽汲能力由每次的0.3~0.45m³提高到了3~4.5m³,抽汲能力是原来的10倍,而且在井口3.0MPa压力下,密封性能良好,完全能够满足油气水井密闭安全抽汲作业要求。

关键词: 自动投球, 清蜡作业, 油田输油管线, 数字化