Sinopec drills high-yielding oil and gas well in Sichuan Basin

2023-01-23

On January 17, the Sinopec News Office was informed that Sinopec's key pre-prospecting well, Ba Zhong 1HF, deployed in Bazhou District, Bazhong City, Sichuan Province, had obtained a high-yield industrial oil flow of 126 cubic metres of oil and 57,700 cubic metres of gas per day in the riverine sandstone reservoir of the Jurassic Lianggaoshan Formation, which was the first trial of a high-yield stable oil flow of over 100 cubic metres from this reservoir, further revealing that the condensate gas reservoir-volatile reservoir in the Sichuan Basin has This is the first time that this reservoir has been tested to obtain a stable oil flow of over 100 mcm, further revealing that the Sichuan Basin condensate gas reservoir - volatile oil reservoir has good exploration prospects and opens up a new position for increasing storage and production.

In recent years, Sinopec Exploration Branch continued to attack the Jurassic river sandstone oil and gas, innovative geological theory understanding, found that the river internal quality sandstone reservoir is well developed, with the characteristics of overpressure rich oil and gas. In February 2022, Sinopec deployed and implemented the Bazhong 1HF well, using the old well site to directly drill horizontal wells, with a horizontal section length of 1,111m and a drilling encounter rate of 969.5m of high quality sandstone in the horizontal section, reaching 87.3% of the sandstone drilling encounter rate.


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Fracturing site at the 1HF well in Bazhong

 

In response to the characteristics of dense river sandstone reservoir and high formation pressure coefficient, Sinopec Exploration Branch insists on close integration with geological engineering, implements "one section, one policy" technical management, innovates the "integration of fracturing, percolation and well stewing" fracturing design concept, optimizes the formation of "close cutting + temporary blocking and steering + high strength sand addition + percolation and oil enhancement" fracturing technology, which strongly enhances the underground oil and gas inflow capacity and establishes a new fracturing model, providing a reference for large-scale fracturing of horizontal wells.

Sinopec will continue to strengthen the overall evaluation and deployment of the Jurassic riverine sandstone field in the Sichuan Basin, and strive to form a large-scale oil and gas storage and production position during the 14th Five-Year Plan period.