Research On Gravel Packing Sand Control For Horizontal Well

For reservoirs of loose sand and heavy oil, high shaly and fine sand, during horizontal well development using casing completion, sand control is a big problem. These reserviors have high shaly, sand production is serious, and sand control is difficult. Sand control using single hanged screen can easily causes screen blocking, which affect horizontal well production. To overcome these problems, prolong validity of sand control of the horizontal wells, achieve better sand control efficiency, and ensure regular production, gravel packing sand control for horizontal well was conducted in this paper. According to the problem of gravel packing, mechanism and process of gravel packing were researched, and key technique was analysised. Circulation packing device HGS and compressing packing device HSS were developed for different reserviors and horizontal wells. Column of gravel packing for horizontal well was designed and optimized. Techniques and steps for keeping high packing efficiency were researched. Around improving gravel packing density, low density packing material DM-1 and carrying fluid SPF-1 were selected through experiment. According to the mechanism of gravel packing and liquid/solid two-phase flow theory, mathematical model for gravel packing was established, and perematers for site application were optimized, which can helps site application. To ensure the conduct of gravel packing for horizontal well, and improve the production effect after sand control method, foam plug removal technology, improved carrying fluid flowback technology, and fines clearing technology were developed. Supporting technologies of gravel packing sand control for horizontal well were developed. Research on blowout period of foam plug removal technology shows that, during the early stage of blowout formation pressure near wellbore area changes wildly, radial expansion and lateral extension of porous channel rock can easily happen. As blowout progressing, filtering flow near wellbore area becomes smooth, and porosity and permeability raise as fluid erosion. Site applications show that the technology can solve the problems for reservoirs of loose sand and heavy oil, high shaly and fine sand. Good economic and society benefits were achieved. Sand control using single hanged screen is revised to formation reconstruction sand control. This is the new technology of sand control for loose sand reservoirs.