Practice of Frac-packing and Sand Control for Horizontal Casing Wells In Offshore High Permeability Formation

Horizontal casing well frac-packing and sand control technology has the advantages of releasing productivity and effectively preventing bottom water coning. However, there are some problems in the M20H1 reservoir, such as high skin factor, contaminated (zone) near the well, long operating section, high permeability and small space gap of screen ring.The operation faces several challenges.By analyzing formation stress and proper stratification, it saves time and cost while avoiding operational risks. The drilling pipe is combined to optimize the structure of the drilling tools, which can reduce the cyclic friction and ensure that the construction pressure meets the requirements. The erosion resistance performance under the extreme working condition is analyzed by numerical simulation and pipe materials are optimized to meet the needs of long-term sand control production. High quality ceramsite and seawater based guanidine fracturing fluid are selected to improve the filling effect. The operation procedure is simplified by glue-free perforating solution, and the cost reduction effect is good. The first application of this technology system in the offshore high-permeability formation was carried out, and the on-site frac-packing operation was successfully completed. The test output reached twice as much as the requirement of production allocation, and the stimulation effect was remarkable. A set of frac-packing and sand control technology for horizontal casing well of offshore high-permeability formation has been formed, which provides technical support for stabilizing and increasing production in Bohai oilfield and can provide reference for similar oilfield development.