Oil and gas well fracturing sand Mechanism and Application of Technology

In the process of oil and gas exploration , oil sand has great dangers , the light can affect the normal production of oil wells , heavy oil can be scrapped. Thus , in the mining process must adopt effective measures sand . Currently the most commonly used for perforating wells sand filling method is mainly underground gravel and sand in the chemistry of solid pipe , although there is a better sand effect, but has a relatively low yield, severely restricted the production wells , wells not solve the fundamental sand problems. To this end it is necessary to study the effect of a good maide resin coated frac sand ,sand valid long , does not affect the method of oil sand production capacity , fracturing and sand combination of complex technology called fracturing sand .
Mechanism of oil and gas wells and sand hazards
From the rock mechanics point of view, there are two mechanisms reservoir sand : the shear failure and tensile failure mechanism . In addition to these two mechanisms , but also includes a maide Coal seam gas particle migration mechanism .Shear failure mechanism . As the rock near the wellbore and perforations suffered circumferential stress and radial stress is too large , causing the rock shear failure , causing  maide fracturing fluid  .
Tensile failure mechanism . When mined , the friction stress around the wellbore fluid gradient and under the action of carrying rocks to withstand tensile stress when this stress exceeds the tensile strength of the rock, the rock tensile failure .Sand particle transport mechanism . In production, the production of pressure or excessive production , acting on the formation of particles too large to pull the drag force , will move particulate formation , leading to decreased formation permeability around the bottom , thus increasing the drag of the fluid drag force , and solid particles may induce output .Sand hazards mainly in the following areas: reduction or stoppage of work ; abrasive surface and downhole equipment ; casing damaged wells scrapped ; loss of production time ; economic and technical losses of oil and gas wells.