(Source: CNPC News, Reporter: Zhao Zhizhong, Feng Yulong)                   
On October 12, 2012, Yumen Oilfield implemented multistage and multiple cluster fracturing of the first well – The well daily output fluids 35 cubic meters after frac, which was 3.5 times of adjacent vertical wells. This news indicated that the experiment of multistage and cluster fracturing of horizontal wells was a success in Yumen Oilfield, which was also a new breakthrough on developing horizontal wells with low permeability and exploring a new approach to fracturing of semideep horizontal wells.

Multistage and cluster fracturing of horizontal wells was an effective method to stimulate low permeability and also the best technology for improving reserves-production ratio, which was still on the stage of grope and test in China.

The cretaceous Yaxi formation in Yumen was a typical low permeability reservoir with the well depths from 3000 meters to 4000 meters. The conventional fracturing was difficult to obtain ideal stimulation effect with a high cost in such a deep horizontal well. Engineering technical personnel in Yumen Oilfield focused on multistage and multiple cluster fracturing. 

In September, Yumen Oilfield cooperated with ENTI Beijing to perform fracturing experiments of the volume stimulation in Yaping 4. On September 18 and September 20, this well was operated with 2 staged and 6 cluster fracturing and fracture monitoring at the same time. On 6 pm, October 11, smooth production was ensured in **.