公开(公告)号：US10590720B2

公开(公告)日：2020-03-17

申请号：US15757549

申请日：2016-09-02

Applicant: STATOIL PETROLEUM AS

Inventor： Henrik Manum ,  Åsmund Hjulstad

IPC: E21B21/08 ,  E21B47/00 ,  E21B47/14

Abstract: A method of obtaining an effective bulk modulus of a managed pressure drilling system is disclosed. The method includes generating a pressure wave in the managed pressure drilling system; measuring a time interval for the pressure wave to travel over a distance in the managed pressure drilling system; and calculating the effective bulk modulus of the managed pressure drilling system using the time interval and the distance.

公开(公告)号：US11085287B2

公开(公告)日：2021-08-10

申请号：US15755921

申请日：2016-08-26

Applicant: STATOIL PETROLEUM AS

Inventor： Åsmund Hjulstad ,  Jan Ove Brevik

IPC: E21B33/14 ,  E21B47/005 ,  E21B47/07 ,  E21B47/06

Abstract: A method of measuring the viscosity of cement slurry used for a primary cementing of an oil or gas well includes pumping the cement slurry along a conduit to a cementing location, measuring a first pressure loss along a first, horizontal portion of the conduit and a second pressure loss along a second, vertical portion of the conduit, and calculating a viscosity of the cement slurry based at least in part on the first and second pressure losses and a flow rate of the cement slurry.