APCF低伤害压裂液技术

Laboratory Study and Field Application of Low Damage Fracturing Fluid APCF

针对常规压裂液残渣含量高、不易返排、对储层伤害大等特点,研制出了APCF低伤害压裂液。该压裂液的稠化剂APCF-1是一种多元可逆交联的结构型聚合物,分子链间通过多元弱键适当结合,形成布满整个溶液体系的多级可逆三维立体网状结构。优选出了适合苏里格气田的压裂液配方:0.4%APCF-1+1%KCl+0.2%APCF-B,耐温达100℃。性能评价结果表明,该压裂液具有黏弹性,且表现出以弹性为主,携砂能力强,并具有施工摩阻低、破胶后无残渣、易返排、对储层伤害低、配制简单、使用添加剂种类少等特点。该压裂液在苏里格气田应用33口井,均获成功,压裂效果显著,证明该压裂液适用于苏里格气田低渗气藏的增产作业。

Fracturing fluids commonly used in Sulige Gas Field are hydroxypropyl guar gum fluid,modified low molecular weight vegetable gum fluid,finely processed guar gum fluid and carboxymethyl fluid etc.In 2012,the price of guar gum soared,causing high cost in formation fracturing with guar gum characterized by high residue,high damage to reservoir and difficulty removing the residue by backflow.A new low damage fracturing fluid APCF is developed to deal with these problems.APCF has good stability at high temperature,and is resistant to high shear rate(with viscosity being 45 mPa-s after shearing 90 min at 100 °C).Other properties of the APCF include low friction,good suspension and carrying capacity,very low residue after gel-breaking,easy-removal of the residue by backflow,low damage to reservoir,and less additives used.This fracturing fluid has been successfully used in Block Su76.