To reduce the pollution of the oil-gas well towards the bottom after its fracturing and decrease the operation costs, the hanger specially used for annulus feeding fracturing was developed.

为了减轻油气井压裂后对地层的污染并降低作业成本，研制了高强度环空压裂专用悬挂器。

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During fracture propagation driven by detonation gas in oil well, dynamic response of crack surface under the gas pressure results in fast fracturing.

油井爆生气体对岩石劈裂作用过程，是裂缝面对动态荷载响应并使其发生动态扩展的过程。

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Hydraulic pressure stimulation (Fracturing) of oil and gas well is the main method of stimulation.

水力压裂作为一种改造油气层的重要方法，是油气增产、增注的有效措施。

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"Hydraulic fracturing in a well for shale gas development, which involves injection of fluids to fracture the shale and release the gas up the well, has been confirmed as the cause for small felt seismic events at one location in the world, " the report states.

CNN: Debate over fracking, quakes gets louder

You are correct that the entire lifecycle of a gas well using current advances in horizontal drilling and hydraulic fracturing needs to be safe and secure.

FORBES: EPA Doubts Its Own Anti-Fracking Study, While Ohio Determines Fracking Did Not Spawn Earthquake Swarm

Wells in shale plays have to undergo a process known as fracturing to boost the porosity of the rock and to make oil and gas flow to the well head.

FORBES: Baker Hughes Ramps Up Oil Fracking On Low Natural Gas Prices