Optimized study on fracture coefficient of sectional fracturing in coalbeo methane horizontal well in Qinduan Block

in order to study the factors aifected to the fracturing parameters in the development of the coalbed mnethane horizontal llaccording to the calbed methane reservir in Oinduan Block.based on the numerical sinui ation method,the orthogonal festdesign was appiedto study the fractre nunberfractre length,fracturespacing .fow capacityfractire distribudion law and fracture morphology combination affected to the production of the fractured horizontal well The resulis showed that he factors affected to the yield increasing eff ct would be the producticn pressure differenc e,fracture numbe:fo w capacity and fracture length. n the coalbed methane1 00 m horizontal wel. he production prssure difference should be kept as 3 ～4 MPa.the frcture number should be 6 ~7 and the fracture spacing should be about 150 m.The mining efect wth even distribued fractures and dunmbel structue fracture morphogy would be the best.The sectional fracturing technique with the ihydraulic jet was applied to the seven grade fracturing construction design of the U type well group in the Z-2H horizontal wellt.