Large Displacement Analysis Of Drilling Tool Combination Bottom Design And Directional Drilling Characteristics

Large displacement drilling technology is the most effective means of maritime and offshore oil exploration and development,.It can reduce the cost of oilfield development, has significant economic benefits. According to the current and future construction of Jidong Oilfield drilling to face the problem, the research on the key technology of large displacement drilling, the focus is on the large displacement drilling borehole extended limit evaluation, friction/torque and casing wear prediction, BHA optimization and directional drilling technology and large displacement drilling cuttings bed formation mechanism and clearance study technical aspects. It has formed a set of suitable for large displacement wells deep in Nanbao beach in conventional drilling technology. To provide a reliable, effective technical support for the efficient development of Jidong Nanbao oilfield and site construction, but also provide technical support for efficient, mature, for similar oilfield development, to achieve the best overall efficiency.BHA is generally composed of structural units, drill collar structure unit and stabilizer structure unit.They are in a three-dimensional space curved in borehole. In the process of drilling in three-dimensional space BHA analysis with drilling pressure, torque, drilling fluid, buoyancy wall support force and bear weight loading etc..In the long-term development of drill string mechanics has produced the following methods:classical differential equation method, finite difference method, energy method, beam method, finite element method and weighted residual method. These methods are that researchers continue to optimize the development of enlightenment. The influence factors of BHA to multi span continuous vertical bending beam stress and deformation were fully analyzed to be considered. We can say that the full resolution is not too realistic. So the use of semi analytical method and numerical method for solving BHA stress and deformation is feasible.The structure and property of BHA directly determine the trajectory in the process of drilling quality. No matter sliding drilling or composite drilling, directional wells BHA mostly have whipstocking capacity.The slope mainly depends on the size of the lateral force generated by BHA. In order to study the problem of convenient, computing program using the BHA method, the control variables are adopted to analyze the BHA.By controlling the other variables do not change, change of a variable with the lateral force, and it will realize accurate control of directional well trajectory.