Sinopec â Zhongyuan achieved an important breakthrough in the Sichuan Basin. Pulu 3, a new pool well, tested 4.6 MMcf/d of gas, through a 10 mm choke, at an interval between 3,545 and 3,945 m in the Jurassic Qianfoya Formation on 8 April 2020.   The success of Pulu 3 demonstrated gas exploration prospective on the Jurassic play in this area and indicated 4.4 Tcf of geological gas resources.   Pulu 3 was drilled in the outside of the Puguang field area with non-marine play target in the Jurassic Qianfoya Formation. The well was spudded in mid-2019 and reached TD on 4 November 2019.  After Puguang field, a giant marine reservoir gas field, on stream in 2010, Sinopec started to carry out exploration drilling for non-marine gas play around the field area, Several wells penetrated reservoir in the Triassic Xujiahe tight gas formations, such as Pulu 1, Pulu 2 and Pulu 1-2H, and tested gas, but no commercial production rate could be maintained during the pilot period. A recent study indicated that the Jurassic channel sands play will be probably an important target to be focused.  Well information:  Pulu 1   Early in 2010, Sinopec drilled its first non marine play exploration well around the Puguang field, Pulu 1 tested gas from the Xujiahe formation, which flowed 3 MMscfg/d through after a fracture work at an interval between 3,490 and 3,514m. During drilling operations, log interpretation indicated 7.2m gas pay in five layers and 107.7 poor gas pay in 46 layers.   Pulu 2  Sinopec drilled Pulu 2 in 2012. The well was drilled in the north part of the Puguang field area with non marine play target in the Xujiahe formation with a PTD of 4,846m. No result reported for this well.  Pulu 1-2H  Sinopec completed Pulu 1-2HF in 2013 and the well is estimated to flow 1.7-3.5 MMcf/d of gas from the Xujiahe Formation.   Background information  The Puguang field was discovered in 2003 when Puguang 1 tested 14.8 MMscfg/d at an interval between 5,610m and 5,666m in the Northeast Sichuan basin. The field is developed as a complex and it includes the Puguang, Dawan, Maoba, Qingxi, Shuangmiao and Laojun gas fields. The field has been approved to hold total 13 Tcf of gas in place, the gas contains high content of H2S with a maximum concentration of up to 145,700 ppm.  The Puguang field was on stream in March 2010.  The main reservoirs of the Puguang field are the Feixianguan formation of the Lower Triassic and the Changxing formation of the Upper Permian formation which are oolitic dolomite and dolomite reef sediments that were deposited in a marine environment. In the field, many wells penetrated non-marine sediments at a moderately depth (3,600m), and some of these wells tested low rate gas without H2S in the Xujiahe formation, other wells had good gas shows in the Jurassic formations with reasonably good reservoir properties. Sinopec started to drill wells to test the non-marine shallow play since 2010 around the field area.
Pulu 3 npw, (Sinopec â Zhongyuan 100%) achieved an important breakthrough in the Basin, well tested 4,6 MMcf/d of gas, through a 10 mm choke, at an interval between 3545 and 3945 m in the Jurassic Qianfoya Fm. The success of Pulu 3 demonstrated gas exploration prospective on the Jurassic play in this area and indicated 4.4 Tcf of geological gas resources. Pulu 3 was drilled in the outside of the Puguang field area with non-marine play target in the Jurassic Qianfoya Fm.