Abstract
AbstractSulige gas field located in Ordos Basin is the largest gas filed in china. Eastern block of this field which consists more than 1000×104 MMscf geological resources belongs to tight gas reservoir. Due to low gas saturation, less than 10% porosity, around 0.05 mD permeability and below 0.85 pressure coefficient, stimulation treatments is necessary in order to get economic production. Development speed of this block had been seriously affect because of Significantly lower single well production than other parts of the Sulige gas field. Low concentration crossed-linked guar fracturing fluid is now commonly used in this area. As small size pore throat, high clay content and water lock, this gas deposit is sensitive to treatment fluid, thus the flowback time of fractured well is very long and production is generally low. In this paper we introduce a new fracturing fluid which can be crossed-linked in acidic water-based fluids. This fracturing fluid contains a kind of cellulose, which is completely soluble with no residue. Cellulose had been used as addition agent in drilling and completion fluid twenty years ago, therefore application range was greatly limited as bad performance stability. New cross-linked agent and additives solved this problem. Because of being compatible well with the reservoir fluids, the damage of fracturing fluid is relatively low. Proppant carrying capacity of this new fracturing fluid can be compared with low concentration crossed-linked guar fracturing fluid. The new fluid has been used in 6 vertical wells, which have 100% treatment success-rate and 8.6×104m3/d average production rate. Comparing with the nearby wells which had the same pay formation and were fractured with the similar fracture treatment scale by low concentration guar fracturing fluid, the flowback time was shortened by 53% and gas production was doubled. In conclusion, this new fracture fluid can reduce treatment time, cost and increase gas production.
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