Study On Improving Flow Conductivity Of Multiple Sand Fracturing

Most unconventional gas reservoirs are still using conventional fracturing techniques to develop.However,due to the low productivity,it is with slim results.Moreover,foreign advanced production technology is not applicable in China,so it is necessary to study a fracturing methods suitable for our conditions.As a recent fracturing technique,however,multiple sand fracturing has been put forward to unconventional reservoirs such as coalbed gas,which is one of the most important directions of this industry.Meanwhile,Huabei oilfield and Sulige gas field have made some exploration on multiple sand fracturing technology,which as the research shows,has considerable advantages in controlling fracture height,extending fracture depth and improving flow conductivity.But yet,it has not been studied that how those parameters act on flow conductivity.Currently,Linxing-Shenfu area coalbed gas reservoir is applying High Displacement and Low Sand Ratio Technology,as well as Compound Fracturing Fluid Technology to enhance recovery,which,however,yielded limited effect.Thus in this paper,the coalbed methane in Linxing-Shenfu area is taken as the research object,which is modeled and analyzed by reservoir simulation software.After that,the theory is verified by experiment,and the result of relationship between flow conductivity and some parameters,such as sand injection stage,sand concentration of each stage,pumping rate and particle size of proppant is concluded.And also,orthogonal experiment method is applied to optimize those parameters.Finally,all the research result is an important references for Well SM-XX in Linxing-Shenfu area to carry out,which is also instructive for other wells in this area and other similar areas to use multiple sand fracturing technology scientifically.