Step displacement increasing fracturing automatic control method used for hole opening

Abstract

The invention discloses a step displacement increasing fracturing automatic control method used for hole opening. The method includes the following steps that S1, fracturing liquid with the first preset displacement is injected into a shaft; S2, the pressure value and the pumping displacement of the fracturing liquid in the shaft are obtained in real time; S3, the pressure feature value in a timewindow is calculated in real time, and a pressure changing feature is analyzed; S4, the displacement increasing amount and the displacement increasing time are determined according to the pressure feature value in the time window and the pressure changing feature; S5, when the displacement increasing condition is met, displacement increasing operation is executed; and S6, the steps S2-S5 are defined as one stage, and when the pumping displacement is smaller than the designed final displacement value, at least one stage is repeated. By means of the step displacement increasing fracture automatic control method used for hole opening, the fracturing effect of the fracturing liquid on an oil / gas reservoir is effectively improved, the utilization rate of a perforation hole is increased, the complexity degree of cracks close to the shaft is lowered, and multiple sets of fractures in the fracturing process can evenly extend; and in addition, the reservoir is increased, the volume and the fracture diversion capability are effectively transformed, and therefore the oil / gas well productivity is increased.

Description

technical field

[0001] The invention relates to the technical field of oil and gas exploitation, in particular to an automatic control method for step-up displacement fracturing for hole opening. Background technique

[0002] Fracturing refers to the injection of fracturing fluid and proppant into the oil / gas reservoir through the surface high-pressure pump group to transform the reservoir and form artificial fractures with a certain volume and conductivity. Oil or natural gas can penetrate into the wellbore through the fractures. This increases oil / gas well production. At present, there are many kinds of fracturing construction techniques that can be used in the development of oil and gas wells. For the same fracturing construction technique, the control of the pump injection displacement has a great influence on the fracture conductivity and the effective stimulation volume of the reservoir. These two parameters It determines the productivity of oil / gas wells after fractu...

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