Development technologies for the Sulige gas field with low permeability and strong heterogeneity

The Sulige gas field in the Ordos Basin is characterized by low permeability,strong heterogeneity and middle-to-high pressure-sensitivity,and the gas wells have low productivity and a short stable production period.The single well simulations and production performance analysis reveal that producing with low daily output can reduce the effect of rock pressure-sensitivity,and that strengthening the management during the period of low production will help to utilize the formation energy rationally and to improve the working state of the reserves distributing in the low permeability area beyond the well drainage.Separate layer fracturing and commingling production can make the most of the controlled reserves in vertical,increase the final cumulative gas production and extend the stable production period.Integrating geological research with seismic interpretation is the key technology for improving the precision of the reservoir forecast and the ratio of successful drilling.Cost-cutting and striving for preferential policies are also effective ways to enhance the economic return.