Research On Temporary Blocking Steering Fracturing Technology For Tight Sandstone Gas Reservoirs

Tight sandstone gas reservoirs are widely distributed in our country, and also they have large reserves, which showed the great potential of development.However, due to the poor physical ptoperty and complex geological characteristics, it is very diffcult and costly to economically develop tight sandstone gas reservoirs, fracturing is the key technology of effective exploitation. While temporary plugging reorientation fracturing in recent years is a new type of highly efficient fracturing technology, using temporary plugging activities,it can stimulate secondary fractures,increase the complexity of the cracks,which can achieve larger stimulation reservoir volume and improve well production, so it is necessary to study temporary plugging fracturing technology.Paper study the temporary plugging fracturing from hydraculic fracture reorientation mechanism, temporary plugging particle evaluation and selection, temporary plugging process optimization, which basied on tight sandstone reservoir characteristics of sichuan western penlaizhen and shaximiao groups. Details are as follows?counting and analyzing the rock mechanical parameters and stress parameters of sichuan western penglaizhen and shaximiao groups, among them xinchang penglaizhen blocks are eassily reorientation blocks because of small horizontal principal stress difference;?Based on rock mechanics and hydraulic fracturing, the reorientation mechanism and reorientation condition of the hydraulic fractures in the wellbore and fracture are studied, different formation?position have different mechanism and condition;?Using ABAQUS building the Finite element model of fracture plugging, which considering the fluid-rock matrix interaction,analyzing the reorientation condition and influencing factors;?Based on geological characteristics of study area, temporary plugging particle evaluation are carried out, and the parameters of the hydraulic fracturing were optimized by numerical simulation software; ?Based on geological characteristics of study area, temporary plugging particle evaluation are carried out, and select the field wells to evaluate the effect of temporary plugging.Paper study the hydraulic fracture reorientation mechanism and condition of sichuan western penlaizhen and shaximiao groups, combined with indoor experiment and field experiment, forming a temporary plugging fracturing which is suitable for sichuan western tight sandstone gas reservoirs, and also provides a new idea for the effective exploitation of tight sandstone gas reservoirs.