Study on the Influence Law of Sand Production After Fracturing in Deep Sandstone Reservoirs

To study the law and characteristics of sand production in deep sandstone reservoirs after fracturing under high temperature, high pressure, and high stress, this study took a block of Keshen Gas Field as the research object and carried out block rock mechanics experiments and numerical simulation research. Through high-temperature and high-pressure triaxial mechanical experiments on cored rock samples from underground reservoirs, parameters such as rock elastic modulus, cohesion force, and internal friction angle were obtained. And according to the experimental results and the geological characteristics of this area, a heat-fluid-solid coupling model for vertical well mining after deep sandstone reservoir fracturing was established. Through the finite element solution software, analyze the Mises stress and equivalent plastic strain parameter change characteristics around the wellbore and at the tip of the fracture. Combined with the criterion of sand production in numerical simulation of oil and gas wells, the law of sand production after reservoir fracturing under different production conditions is obtained. The research results show that: with the increase of the production pressure difference, the risk of sand production gradually increases; the higher the formation temperature, the higher the risk of sand production; the more uneven the horizontal stress state, the more serious the degree of sand production in the reservoir; the more significant the cementation strength, the smaller the risk of sand production in reservoir mining; the formation around the crack is almost undamaged, and the risk of sand production is mainly concentrated around the wellbore.