公开(公告)号：US20180245412A1

公开(公告)日：2018-08-30

申请号：US15757549

申请日：2016-09-02

Applicant: STATOIL PETROLEUM AS

Inventor： Henrik MANUM ,  Åsmund HJULSTAD

IPC: E21B21/08 ,  E21B47/14

CPC classification number: E21B21/08 ,  E21B47/00 ,  E21B47/14

Abstract: A method of obtaining an effective bulk modulus of a managed pressure drilling system 1, the method comprising: generating a pressure wave in the system 1; measuring the time interval for the pressure wave to travel over a distance in the system 1; and calculating the effective bulk modulus of the system 1 using the time interval and the length.

公开(公告)号：US20180328162A1

公开(公告)日：2018-11-15

申请号：US15755921

申请日：2016-08-26

Applicant: STATOIL PETROLEUM AS

Inventor： Åsmund HJULSTAD ,  Jan Ove BREVIK

IPC: E21B47/00 ,  E21B33/14 ,  E21B47/06

CPC classification number: E21B47/0005 ,  E21B33/14 ,  E21B47/06 ,  E21B47/065

Abstract: A method and system for calculating the viscosity of cement slurry used for a primary cementing of an oil or gas well (12) comprises: pumping the cement slurry along a conduit (16) to a cementing location (20); measuring a first pressure loss along a first, horizontal portion (28) of the conduit (16) and a second pressure loss along a second, vertical portion (30) of the conduit (16); 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.