Nowadays, the fiber has become the most important oilfield chemical material with great advantages in hydraulic fracturing treatment when considering fluid leak off, proppant transportation and fracture damage in tight oil and gas reservoirs. However, it still has some drawbacks, such as mechanical properties, heat denaturation and poor chemical stability, always emerge in oilfield cases. Accordingly, a new type of oil soluble temporary diverting agent is used to overcome these shortcomings in our research. We developed into a new agent with different types of petroleum resin and hydrocarbon resin. A series of evaluation experiment was carried out including temperature compatibility, diverting efficiency and dispersity etc. The results showed that with increasing temperature and prolonging dissolved time, the oil soluble rate of temporary agent in 6 hrs was 95%-99% at 80-120 °C, which indicated good oil solubility. After complete dissolution, the viscosity of 5-20 g/L solution was 12.6-53.7 mPa.s, which had good flowback after treatment. Furthermore, by reducing the diverting particle size and improving the level of aggregation of particles, a specially designed instrument was put forward to evaluate the performances of fracture conductivity, fracture diverting. The length and concentration of the agent were optimized in this study.
More than 20 treatments with new agents in Huabei oil field have been performed with encouraging results, 95.2% efficiency with an average post-fracturing rate reach to 21.3m3/d, which was three times of before stimulation. The results have great influences on both theoretical study and field treatments of new chemical material for impoving complex fracure degree of hydraulic fracturing in tight oil and gas reservoirs.