ABSTRACT
The buried depth of oil and gas reservoirs in Tarim Basin is 7000–8000m, and the length of the above salt formation is 4500–6000m. The drilling period of this section accounts for more than 50% of the total drilling period. It is the critical factor for speeding up the drilling of ultra-deep wells in this block. Actual drilling experience shows that there is a great relationship between drilling efficiency and drilling fluid performance control. However, at present, the determination of drilling fluid performance parameters in this block mainly depends on experience for adjustment and final determination, lacking theoretical guidance. In order to solve the above problems, the author puts forward an optimization method based on the combination of theoretical calculation, software simulation, and drilling big data analysis. Combined with the formation characteristics of the block and the requirements of engineering, the author puts forward the key points of drilling fluid rheology control in each upper salt formation. This study enhances the theoretical and pertinence of drilling fluid fluidity design and provides a basic guarantee for drilling speed increase in salt formation in the block.
