Study On Application Technology Of Raising Drilling Speed ​​in Guang'an Structure

Guang’an structure there are different pressure system, over Xujiahe low formation pressure, collapse pressure is high, Xujiahe formation fluid pressure is high, the second opening of the drilling fluid density is generally high,result in frequent lost circulation,staggered formation sand and shale, Xujiahe quartz sandstone seriously restricted the use of PDC bits, thus affecting the drilling speed rate and drilling cycle. To speed up the construction Xujiahe Guang’an exploration and development of the pace of exploration and development to improve efficiency, excellent construction carried out faster Guang’an casing drilling optimization, bit selection, deviation control, and balanced application of acceleration technology, the basic form the exploration and development Guang’an structure Xujiahe gas drilling speed matching technology, made the following test results: (1) PDC drill test the progress made, the initial realization of the second openingof a PDC drill bit Xujiahe gas reservoir at the top of the goal, you can choose the bit B1935L, DM653, H545SBG three types of drill bits as well section Speed 215.9mm the main bit.(2) cone bit selection is also making progress, recommended Guang’an Xujiahe bit from top to bottom with the order:311.2mm SJ517GK cone bit,215.9mm PDC bit B1935L, DM653; cone bit HA437G, HA517G (or HA517) 2-3 only HA517G (or HA517) drill to be six, four reservoirs, HA437G bit applications in the strata Shaximiao effect is very good.(3) 215.9mm gas drilling and conventional drilling speed test speed basically the same advantage is not obvious.(4) Dual stabilizer BHA benefit PDC bit drilling wellbore quality assurance.The formation of the drilling speed in Guang’an structure matching process to obtain the ideal speed results in the areas of Sichuan also has a similar structure of the speed reference worthy of promotion.