Optimal Design and Application of Nitrogen Foam Fracturing in Sulige Gasfield
The formation pressure coefficient of Sulige gas field is low,and the problems of water sensitivity and water lock are prominent in some blocks.Using conventional water-based fracturing has the problems of large water consumption and difficulty in discharging the flowback fluid,which seriously affects the production capacity of gas wells.Nitrogen foam fracturing is one of the effective means to increase the production of single well in this kind of gas reservoir.In order to improve the overall performance of nitrogen foam fracturing fluid,the foam fracturing fluid system was evaluated,auxiliary equipment such as closed sand mixer and micro-foam generator was applied,the Ø88.9 mm pipe string and the operation parameters of"variable gel concentration+variable foam quality+variable particle size ceramic particle"were selected.Su X well was taken as an example to carry out the nitrogen foam fracturing field test.After optimization,the foam fracturing fluid's bubble stability performance,fracture-forming efficiency and sand carrying capacity were significantly improved.Compared with conventional guanidine gum fracturing in the same block,the maximum surface sand concentration reached 1 452 kg/m3,the water consumption was reduced by 62%,the liquid discharge cycle was shortened by 47%,and the test open flow achieved 429,000 square meters/day.It realizes the purpose of less water consumption,high sand carrying and early gas discovery,and shows a good application prospect in the reservoir reconstruction of low pressure tight gas reservoirs.
Sulige gas fieldnitrogen foam fracturingmicrofoam generatorvariable foam mass
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