Numerical Simulation For Gravel Pack With Foam In Horizontal Well

With the rapid development of the oil industry, the application of horizontal well oil and gas field exploration and significant economic advantages are increasingly being valued by countries in the world in recent years. For unconsolidated sandstone reservoir, Sand serious, especially in open hole horizontal wells in sand are relatively serious. Unconsolidated sandstone reservoirs in China and wide reserves of large, sand is a loose sandstone oil reservoir with a difficult problem often encountered. Oil production at home and abroad in both the widespread problem of sand, but sand production has become a stable production wells is currently restricting an important factor. More problematic for sand production process used is gravel packing techniques.Horizontal well gravel pack completion method has maintained long-term high-yield oil wells, borehole stability and to prevent formation sand, etc., especially for loose sand-prone reservoirs, gravel packing is the preferred method of horizontal well completion. The current level of operations took place well in advance of gravel filling plug lead to job still high risk of failure impede the most efficient way of horizontal well completion large-scale application. In order to address horizontal well in advance of gravel filling plugging problems at home and abroad to conduct a large number of physical simulation and numerical simulation. Due to limited conditions, the practical significance of the physical simulation results is also very limited. It does not guide the field operations.In the numerical simulation, the at home and abroad to establish a variety of model horizontal well gravel packing process was simulated in the process of gravel packing sand used in the carrying liquid are Newtonian fluids. China's current production of oil and gas exploration into the latter part of reservoir formation pressure less, in the gravel packing process, the carrying sand for filling liquid in the process of carrying gravel at the same time are more likely to enter the formation, thereby causing pollution of strata. Through the level of understanding of the mechanism of gravel packing wells, horizontal wells are actually filled with gravel with sand-carrying properties of the liquid carrying gravel in the horizontal well bore migration process. Better to bring performance and low fluid loss of. For the horizontal well gravel packing operations ahead of clogging problems and carrying sand into the formation fluid, the paper used as a bubble of fluid carrying sand-gravel packing fluid of horizontal wells to carry out numerical simulations in order to achieve better filling results. In the model, this paper draws on pipe flow of two-tier model or three-layer model.The article finally affecting the efficiency of gravel filling factors, such as mortar displacement, gravel size, shaft parameters were analyzed and summarized. In addition, in order to facilitate the practical application, to improve work efficiency, on the basis of the above studies, using visual programming language Visual Basic horizontal well prepared to carry gravel filling the bubble parameter optimization of construction design software. The software can calculate the terminal velocity of gravel, but also can analyze emission mortar, gravel size, wellbore parameters and other factors on filling effect.