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Sinopec News Network reported on July 11, the Pulu 5 well drilled by the 50437 drilling crew of the Southwest Project of the Second Drilling Company of Zhongyuan Petroleum Engineering Company successfully completed the 138-meter coring task of the directional section, with a harvest rate of 99.
8%.
Chuangpuguang block High index of directional well coring
.
Well Pulu 5 is a pre-exploration well located in Huangya Village, Hujia Town, Hujia Town, Xuanhan County, Sichuan Province by Zhongyuan Oilfield Puguang Branch.
It belongs to the Puguang West syncline structure in the Huangjinkou structural belt of the eastern Sichuan fault fold belt in the Sichuan Basin, with a designed well depth of 3,289.
63m
.
The well was cored at a depth of 3120 meters.
The stratum is Qianfoya 1st member, mainly carbonaceous shale, with developed micro-fractures and fractured stratum.
The well inclination is close to 40 degrees, and leakage and core plugging are prone to occur.
The formation encountered abnormally high pressure
.
In order to complete the coring task safely and efficiently, the company and the well team comprehensively analyzed the difficulties of coring and formulated targeted technical solutions
.
Use a micro-eccentric centralizer to correct the borehole, do well the formation pressure test, improve the formation pressure capacity, clean the borehole with large displacement, increase the lubricity and rheology of drilling fluid, reduce friction, and prepare for coring in advance Work
According to the short trip and the oil and gas upward velocity, the technicians will inject an appropriate amount of heavy plugs and thick plugs before coring to ensure a safe time for tripping
.
Timely improvements were made to the inner and outer centralizing blocks of the Sichuan 7-5 high-strength coring tool to increase the stability of the bottom hole operation of the tool and improve the success rate of coring
The Pulu 5 well has a total of 8 cores in the directional section, with a cumulative core footage of 138m, an average of 17.
25m per tube, a core harvest rate of 99.
8%, and a core recovery rate of over 96%
.
The coring task was successfully completed .
(Liu Jianzhu and Wang Jixue)
