Under the effort of enterprises and scientific institutions, in the past year, China continuously gain breakthrough in shale gas geophysics, well drilling, well completion and fracturing reformation etc. technologies, which make gas field exploration & development efficiency and economical efficiency continues improve. Horizontal well single well cost reduces from 100mn CNY to 50-70mn CNY. Drilling period has shorten to 2-3 months from 5-7 months, with the shortest one which only spends 33.66 days
Currently, China has 3500 meters and less shallow horizontal well drilling and staged fracturing ability. Independent R&D’s fracturing trucks etc. devices have put into application. Coiled tubing technology and bridge plug etc. key techniques respectively realized localization. China has become the third country use independent technology and device to do shale gas commercial exploitation, just behind US and Canada.
Shale Gas Prospection & Evaluation
In May, 2014, comprehensive geological evaluation which is structured by Chongqing Institute of Geology and Mineral Resources has used to Southeast Chongqing Fm-Wufeng-Longmaxi shale's benefit area differentiate and shale gas resources potential evaluation. Meanwhile, gas content tester developed by this institute has successfully applied in Chongqing Area shale wells' field test.
Up to the middle December, 2014, 31 of 36 shale gas wells which through SCGC shale gas geophysical technology research findings got gas, the probability of 86%. Among, Yang-201-H2 Well shale gas production is 430,000m3/d, Ning-201-H1 Well shale gas production is 130,000m3/d. The technology have played an important role in supporting shale gas exploration & development
Well Drilling, Well Completion and Matching Techniques and Devices
In 2014, Sinopec Jianghan Petroleum Engineering and Kingdream Public Co., Ltd. joint R&D new type of PDC drill. This drill can perfect combine with LWD geology steering technology and localization screw, and it is comparable with abroad spin orientation technology. In the same year, Jianghan Petroleum Engineering first applied coiled tubing fiber optic gas producing profile testing technology in Fuling Jiaoshiba Work Area and succeeded, which make up single rotor type test tool's fault which cannot clearly see and judge each fluid and flow speed.
In 2014, Chuanqing Drilling Fluid Technology Service Co. achieved major breakthrough in drilling fluid technology. In May, 2014, the company R&D's shale gas oil based drilling fluid first did field test in Wei 204H1-2 Well. After that, the technology is applied in 11 shale gas wells, and break foreign countries' monopoly. The company R&D's excellent and fast water based drilling fluid technology successfully applied in Weiyuan Block Second Round drilling, the average drilling period is 63.1 days, reduce 28.05% than the first round.
In September, 2009, Hengyang Valin Steel Tube Co., Ltd. R&D's special buckle casing which has double sealing smooth down to the wells in Xiangxi Shale Gas Block. The product meets the characteristics demands of shale gas exploitation under complicated geological conditions.
In October, 2014, bridge plug and its matching technology, which is R&D by Sinopec, successfully used in Chongqing Fuling Shale Gas Field, suggest that China shale gas development key technology and device manufacture completely get rid of the reliance of foreign countries, wholly realize localization.
Fracturing Technology and Devices
In March, 2014, SJ Petroleum Machinery Co., Sinopec independent R&D's 3000 Level fracturing truck which has the world largest single machine efficiency first applied in shale gas fracturing scene which is located in Chuannan County, Chongqing. The device has 20% efficiency higher than other fracturing trucks, and the consumables' lifetime increases more than 20%.
In October, 2014, Petroleum Engineering Institute micro porous high efficiency casing pressure-bearing and sealing technology first and successfully applied in Jiao Shale 14-1HF Well, Sinopec Fuling Shale Gas Field, which get rid of the reliance of other countries, and give strong technology support to secure capacity.
In addition, in January, 2014, Jiao Shale No. 5 Gas Gathering Station, Sinopec Fuling Shale Gas Field first intelligentialize gas gathering station, formally realize 24h unattended operation, meet the need of shale gas large scale development speed up and efficiency increase.
ASIACHEM believes that, aim of China shale gas output that will reach 30bnm3 in 2020 will bring a huge market opportunity to China shale gas matching technology, engineering service and device manufacturing. Technology and device's localization will reduce shale gas exploration & development cost. The reduce of cost will strengthen the competitive of shale gas and market space, and bring more exploration and development power and need of localization technology and device, and form a virtuous cycle. All the Chinese energy and chemical industry will get benefit because of it.
The articles originate from ASIACHEM