煤层气L型水平井新型杆式泵排采工艺及应用

Recovery Technology and Application of a New Rod Pump in the Coalbed Methane L-Type Horizontal Well

针对煤层气L型水平井普遍存在的下泵位置受井斜限制、煤粉等固体颗粒卡堵泵、气体进入泵筒降低泵效、检泵周期短等问题,研制了一种新型水平井杆式抽油泵,并对其支撑坐封总成进行了改进,配套设计了一种新型的煤粉滤过式气锚,形成了煤层气L型水平井配套的防泵漏失、防卡堵泵、防气体影响的杆式泵排采工艺技术。该工艺进行了3 a现场试验,与前期常用的水力射流泵、电潜螺杆泵、普通管式泵、普通杆式泵等进行了综合分析对比。结果表明:新型杆式泵下入井斜达到70~82°,泵效达到45%~95%,平均检泵周期是原来的3.6倍且继续有效。该工艺较好地满足了煤层气L型水平井排采要求,工艺适应性和可靠性大幅提高,可进一步推广使用。

The L-type horizontal well production in eoalbed gas reservoir is generally limited by marly problems, including the limited downhole pump position results from well inclination, pump stuck or block by pulverized coal and other solid particles, low pump efficiency by gas inflow, short pump inspection cycle, etc. A new rod pump for horizontal well is developed and its support setting assembly is improved, A new gas anchor with pulverized coal filtration is designed and matched to develop a rod pump recovery technology with pump ioss prevention, anti-stuck and anti-block and anti-gas inflow for the L-type horizontal well in coalbed gas reservoir. A field test is implemented for 3 years and the corresponding performance is cumpared with that of hydraulic jet pump, electric submersihle progressive cavity pump, conventional tubing pump, conventional rod pump, etc. Research indicates that the new rod pump can setting inclination is up to 70- 82°, the pump efficiency reaches 45%- 95% and the average pump inspection cycle is 3.6 times of the original and continue to run. The production performance of L-type horizontal well in eoalbed gas resmwnir can be efficiently improved by this technology with better adaptahility and reliahility, which shows a favorable promoted application.