煤层气水平井油管拖动分段喷砂压裂工艺实践

Practice of Tubing Drag Sand-blasting Staged Fracturing Process for CBM Horizontal Well

文章提出了"分段喷砂压裂"的技术思路,针对筛管完井的水平井,通过单喷枪和双封隔器拖动分段造穴工艺,能够在水平段形成多个洞穴,并将煤渣煤屑返排出地面,地层应力得到了有效释放,为单井增产提供基础。针对套管完井的L型水平井,通过油管拖动分段喷砂压裂工艺,能够在增大储层改造面积的同时,保证主支与分支的联通,很好的改善储层渗透性。

The technical idea of ＂sand-blasting staged fracturing＂ is put forward in the paper. As to the screen completion of the horizontal well, single spray gun and double-sealing drag segmented cave build- ing technology make it possible to form multiple caves in the horizontal section. The coal cinder can be discharged back to the ground and the formation stress has been effectively released, which provides the basis for increasing production of single well. As to the L-type horizontal well of casing completion, tub- ing drag sand-blasting staged fracturing technique can increase the reservoir reconstruction area and at the same time ensure the connection between main branch and branch, which will improve the permeability of the reservoir.