Based on that, compound fracture tech of trying to squeeze with fracture, acid treatment before fracture, separating layer by sand face or packer is put into practice which reaches the purpose of developing flowing capacity of crack and raises successful ratio of the fracture.

To the three low oil layers with seriously low heterogeneity and inadequate formation energy,compound fracture technology combines advantages of high energy gas fracturing technology with hydraulic fracturing technology to effectively achieve the goal of increasing productivity and injection increasing.

Technology of compound fracturing in Tong47 block;

This paper analyzes the geology and works out new fracturing technologies for the two oil provinces, which are compound fracturing, coarse solids fracturing, and liquid nitrogen fracturing.

Compound fracturing is a newly simulation of production well and rejection well,It connects hydraulic fracturing and high energy gas fracturing(HEGF).

Experiments were done to optimize the oil base fracturing fluids, in which the dewatered crude from Huangchang oilfield was used as the base fluid, LHPG02 (a phosphate) was used as the gelling agent, sodium metaaluminate as the cross-linking agent, and anhydrous sodium acetate as the gel breaker.

The synthesis condition of gelling agent phosphate ester in oil base fracturing fluid is studied on this paper.

Experimental study of oil based fracturing fluid: LHPG-2000;