Microscopic Pore Characteristics Of Long 8 Reservoir In Heshui Area And Mechanism Of Fracturing Fluid Damage

The Heshui area is located in the Ordos Basin,the second largest basin in China.At present,it has been found that the Heshui area Chang 8 is rich in petroleum resources.Compared with the Chang 8 reservoir in the Huaqing area of the neighboring area and the Chang 8 reservoir in the Zhenbei area,the mining effect of the study area has not been particularly satisfactory.In this paper,through the combination of various experimental techniques and methods such as casting thin film,scanning electron microscope,mercury intrusion method and nuclear magnetic resonance,the physical parameters,rock mineral composition,relative content of clay mineral,pore type and pore structure of the study area can be obtained.The characteristics and pore parameters were finally completed and comprehensively characterized and characterized by the micro-pore characteristics of the Chang 8 reservoirs in the Heshui area.Secondly,on the basis of this,the reservoir fracturing fluid damage experiment and the clay expansion experiment are carried out,and the fracturing fluid damage mechanism and the clay swelling damage analysis are carried out.The T2 signal change before and after the core damage is calculated by the nuclear magnetic resonance technique to achieve the The core pore structure changes were quantitatively calculated.Finally,the correlation between the experimental results and the microscopic pore characteristics of the reservoir is analyzed,and finally the main factors(Reservoir microscopic pore characteristics,fracturing fluid type and anti-swelling agent)affecting the fracturing fluid damage reservoir in the study area are determined.Because the fracturing fluid damage to the reservoir during fracturing is one of the main problems that must be considered in the fracturing effect,this paper studies the microscopic geological characteristics of the reservoir and combines the laboratory experimental research methods to determine the fracture damage more deeply.The internal reason is to improve the effect of the reservoir fracturing process in the area and reduce the damage of the fracturing fluid to the reservoir to help the actual fracturing operation on site.