Hydraulics Calculation Of Dual Gradient Drilling

Petroleum reserves declines because of continued production,so the industry extends its search into ultra-deepwater and marginal areas that present significant economic risks and technical hurdles.Dual gradient drilling(DGD) is a new drilling method in deepwater, which overcomes a series of significant deepwater drilling challenges associated with the relatively high pore pressures and low formation strengths. This technology has a wonderful perspective. This paper describes the calculations of subsea mudlift drilling(SMD) and DGD with hollow sphere glass(HGS).Firstly, this paper study the key technologies of SMD and HGS. Secondly, it obtain models of temperature distribution, and calculate drilling fluids rheological parameters effected by temperature and pressure. Thirdly, it develop hydraulics models of SMD and HGS, which been considered effects of temperature and pressure. Fourthly, aimed to the characteristics of DGD, a hydraulics optimization model of power law fluid model is studied. Finally, based on this model, this paper make a program of hydraulics optimization, and then verify this program with simulated data in a foreign document. It's proved that the calculated results accurately coincide with the data in the literature.