柱塞气举在川西地区定向井中的应用研究

Application of plunger air lift in directional wells in the western Sichuan Basin

柱塞气举排水采气工艺一般应用于直井,国内外尚没有在定向井中应用的先例。为了探索该工艺在定向井中的应用,在川西气田川孝601-4井(最大井斜角为38.49°)开展了柱塞气举试验。通过优化入井工具串长度以及施工程序,成功安装了井下设备,并对各项工艺参数进行了优化设计;试验井安装柱塞气举后,柱塞运行正常,油套压差明显减小,增产天然气0.8×104m3/d,排水采气效果非常明显,试验取得了圆满成功。柱塞气举排水采气工艺在定向井中的首次成功应用,表明该工艺可以适用于井斜角小于40°的定向井,拓宽了该项工艺的应用范围,丰富了川西气田气井的排水采气措施。

Although plunger air lift is often applied in vertical wells,no such precedent cases have yet been found in directional wells at home and abroad.In view of this,plunger air lift tests were carried out in the ChuanXiao 601-4 well(with the maximum deviation angle of 38.49°) of a western Sichuan gas field.Through a good design of the length of tool string and operation procedures,downhole equipments were installed successfully and the related technical parameters were optimized.After the installation of plunger air lift,the plunger operated normally,the differential pressure of tubing and casing pressure decreased obviously,and the production of natural gas was increased by 0.8×104m3/d,which indicate that the drainage gas effect is significant and the test is successful.This first-time successful application shows that this technology is applicable in such a directional well with a deviation angle less than 40°.The application range of plunger air lift is thus extended and measures of water drainage and gas recovery are strengthened in gas wells of western Sichuan gas fields.