Jilin Oilfield, Low Permeability Gas Possession Of New Solid-free Fracturing Fluids And Applications

Fracturing fluid is a kind of working fluid during hydraulic fracturing treatment in reservoirs. Fracturing fluid properties play an important role in affecting the treatment success possibility and postfrac well performance.Basis on the background of Jilin oil field hydraulic fracturing treatment, a new cross linked polymer system has been developed for improved its currently work method. It is supposed to solve the problem of Jilin oil field about normal fracturing system injury stratum. The polymer thickener acts as thickening agent in fracturing system. Then JLJ-1 as a proper cross linker be chosen to crosslink the thickening agent, furthermore, other affection factors as the react environment PH and temperature were adjusted to form the optimum gel fracturing system formulation. And take the in—house laboratory investigation for the fracturing fluids by the petroleum standard SY/T5107—1995. The viscosity is up to 50 mPa.s at 170s^-1 after shearing 2 hours. The system can stand temperature up to 90℃. Once the system is broken, the viscosity will drop to less than 5 mPa.s quickly and the residue of fracturing fluid is very little. Quantity of every additional agent with different temperature of well is established. This fluid would fulfill the requirements of fracturing fluids of having the superior properties of good thickening, well temperature and shear tolerance, quick gelout, low residue and low damage to the reservoirs.It is a low-cost and low formation damage hydraulic fracturing polymer system, which meets the need of Jilin oilfield formation damage. It is supposed to widely use in Jilin and other oil and gas field as a excellent fracturing system.