一种新型随钻堵漏剂ZTC-1的生产工艺及性能评价

The Preparation and Evaluation of a New Lost Circulation Material ZTC-1.

以杏仁壳为主要原料,经过初级粉碎、脱脂、干燥、超微粉碎和造粒一系列加工工艺研制出了一种新型随钻防漏堵漏剂,代号为ZTC-1。实验结果表明,该堵漏剂在正压差作用下能迅速形成有效封堵,封堵强度高、深度小,加入钻井液中有利于降低钻井液API和高温高压滤失量。与传统堵漏剂相比,ZTC-1防漏堵漏剂具有延时膨胀性,且膨胀比例更大,施工简便,用量少,若复配传统随钻堵漏剂可处理各种裂缝性、破碎性、孔隙性和渗透性等地层的漏失以及漏失位置不好确定的漏层的防漏堵漏。

A new lost circulation additive,ZTC-1,is developed using almond shell as the main raw material through crushing,degreasing,drying,comminuting,and pelleting.Laboratory experiments show that ZTC-1 generates an effective,high strength sealing on borehole wall instantaneously with shallow particle invasion in the formation.ZTC-1 has lagged swelling,with a larger swelling volume compared with conventional LCM.ZTC-1,when mixed with conventional LCM,can be used in sealing mud losses in fracturing, cracked,porous and permeable formations,as well as in loss zones that are difficult to locate.