Research On Reservoir Damage Mechanism And Protective Measures Of Longxi Region

Reserves in Longxi Region are relatively large and typical of low permeability oil fields. The characterof this oil field can basically represent the attribute of peripheral oilfields of Daqing. Therefore, studyingreservoir petrographic characteristics and predicting reservoir potential damage mechanism of peripheraloilfields of Daqing is a significant work for exploratory well to protect reservoir and increase capacity.There is mostly siltstone and shale siltstone in the reservoir which has the distinguishing festure of finerock particles, small porosity, high clay content and strong sensitivity. Reservoir can easily be damaged andonce damaged, it is quite difficult to recover. Only to make sense of damage mechanism, can we proposeprotection measures of reservoir for the exploratory well timely and effectively and design completiondrilling fluid to protect reservoir.The specific object of this study is mainly about Fuyang Reservoir of Longxi Region, Songliao Basin.We have used the advanced experimental testing methods and carry out the analyses of the low-permeability sandstone reservoirs in geological features and the potential damage factor. Reservoirsensitivity evaluation and drilling and completion fluid dynamic damage assessment has been conducted. Acomprehensive analysis of reservoir damage mechanism of low permeability sandstone has also beenconducted. Study the prediction method of potential sensitivity of reservoir and we have carried outinnovative work in this area. We not only establish a rapid new method for predicting, but also develope aseries of software for the rapid prediction of reservoir sensitivity. Carrying out sensitivity evaluation forin-depth study of reservoir damage mechanism is of great significance in order to take targeted rapidprevention and treatment measures to protect reservoir effectively.The basic principle of shielding temporary blocking technology has been applied in this paper. The IDfilling theory of temporary plugging material optimization and fitting different dosage ratio has beenproposed based on pore structure parameters of reservoir and the particle size distribution regulations oftemporary blocking materials. Then the optimal particle ratio formula of completely temporary pluggingagent is determined. Carry out indoor temporary plugging experiment and form the technology of ID fillingfully shielded temporary blocking drilling and completion fluid to protect the low permeability sandstonereservoir. Propose a targeted technology program of reservoir protection. Form a supporting technology ofdrilling and completion protection which is suitable for the characteristics of the region of interest,reservoir initially. Provide technical support to improve the capacity of low-permeability reservoirs, and tospeed up the discovery and evaluation of reservoir of the study area.