一、前言水力压裂是利用高压泵将高粘液体以一定的排重注入井里,然后在井底(?)起高压。当此压力超过地层的破裂压力时地层被压开井形成裂缝。水力压裂技术作为油气田的一种增产措施,在国外得到了广泛应用,特别在开发低渗透地层和深部地层中,水力压裂技术的使用就更是必不可少了。据报导,国外在开发渗透率特低(以微达西计)的气田中,压裂起了决定作用,经过压裂把原来无开采价值的气田变成了(?) First, the preface Hydraulic fracturing is the use of high-pressure pump will be high viscosity liquid into the well with a certain weight, and then from the bottom (?) High pressure. When this pressure exceeds the formation rupture pressure, the formation is crushed open well to form a fracture. As a stimulation measure in oil and gas field, hydraulic fracturing technology has been widely used abroad. Especially in the development of low permeability strata and deep strata, the use of hydraulic fracturing technology is even more indispensable. It has been reported that fracturing has played a decisive role in the development of gas fields with extremely low permeability (in the order of micro-Darcy) in foreign countries. After the fracturing, the original untapped gas field became?