Study On Damage Mechanism And Production Countermeasures Of Fracturing Completion Of Compact Clastic Rock Reservoir

Based on the characteristics of complex compact clastic rock in the Midwest area,this paper analyzed the sensitivity of the reservoir and studied the key reservoir damage type and the controlling factors during the process of fracturing well completion,put forward the comprehensive measures of reservoir protection and basic countermeasures,which taking the nature core in Hangjinqi area as the main object.After the research ans analysis on the characteristics of physical properties,the sensitivity damage and the fracturing fluid damage in Hangjinqi area,it is found that the average permerbility of Hangjinqi reservoir is lower than 3.5×10^-3?m²,the average porosity is less than 11%,the average median pore throat radius is less than 0.4?m,which conforming to the typical characteristics of low permeability and low porosity reservoir.The order of sensitivity influence degree are as follows:stress sensitivity>water sensitivity>acid sensitivity>alkaline sensitivity>velocity sensitivity.The main sensitivity is the stress sensitivity and the water sensitivity,the stress sensitivity damage to the matrix permeability is up to 57.08%;during the fracturing well completion,the fracturing fluid damage includes the clay swelling damage,water lock damage and filter cake damage,which the water lock damage is the key damage type and the damage rate is up to 54.55%.Based on the research result of the main sensitivity and the key damage type,the comprehensive reservoir protection countermeasures is put forward,provides the basis for the research on the damage mechanism during the fracturing well completion and the selection of the key addictives of the well fluid.