湘娄页1井废浆循环利用与无害化处理技术

Recycling and harmless treatment technology of waste drilling fluid for Xianglouye-1 well

摘要:

为落实绿色勘查理念，针对湘娄页1井施工中产生的800 m3钻井液废浆，设计了一套循环利用与无害化处理系统。该系统通过废浆池收集废浆，经泥砂分离器初步分离大颗粒固相后，将合格浆液返回钻井循环系统；不合格浆液添加聚合氯化铝（PAC）和阴离子型聚丙烯酰胺（PAM）破胶处理，再经固液分离装置压滤为泥饼和清水；清水可回用或达标排放，固相用于道路建设或安全填埋。现场应用显示，该系统全井循环利用废浆400 m3、清水200 m3，直接节省材料费用约16万元，实现了污染物零排放，为页岩气勘探中的钻井液环保处理提供了可行技术方案。

Abstract:

To implement the concept of green exploration， a recycling and harmless treatment system was developed for the 800 m3 waste drilling fluid generated during the construction of Xianglouye-1 well. The waste fluid is collected in a waste mud tank. After coarse solid particles are preliminarily separated by a desander， qualified slurry is returned to the drilling circulation system. Unqualified slurry is subjected to gel-breaking treatment by adding polyaluminium chloride （PAC） and anionic polyacrylamide （PAM）， followed by solid-liquid separation with filter press to produce mud cake and clean water. The clean water can be recycled or discharged up to standard， and the solid phase can be used for road construction or safely landfilled. Field application results show that 400 m3 waste drilling fluid and 200 m3 clean water of the whole well were recycled by this system， saving more than 160000 RMB in material cost directly. Zero pollutant emission was achieved， which provides a feasible technical scheme for environmental treatment of drilling fluid in shale gas exploration.