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公开(公告)号：US09759025B2
公开(公告)日：2017-09-12
申请号：US15317120
申请日：2015-05-20
Applicant: MHWIRTH AS
Inventor： Dag Vavik
CPC classification number: E21B21/001 , E21B7/12 , E21B21/067 , E21B33/064 , E21B44/00 , E21B47/06 , E21B47/065 , E21B47/10
Abstract: A method for detecting an influx in a wellbore with first and second pressure transmitters arranged in a fixed vertical distance in relation to each other. The method includes calculating an expected density of a return flow between the first and second pressure transmitters, continuously measuring an actual density of the return flow based on a measured pressure at the first and second pressure transmitters, comparing the calculated expected density of the return flow and the measured actual density of the return flow to determine the influx in the wellbore, and predicting a probability of hydrates forming in the well by measuring a temperature via a temperature transmitter arranged in a section of the well adjacent to the first and/or the second pressure transmitter, and using the temperature together with the measurements from the first and second pressure transmitters.
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公开(公告)号：US09869158B2
公开(公告)日：2018-01-16
申请号：US14917275
申请日：2014-06-27
Applicant: MHWIRTH AS
Inventor： Dag Vavik
CPC classification number: E21B34/04 , E21B17/01 , E21B21/001 , E21B21/08
Abstract: A deep water drilling riser pressure relief system includes a drilling riser extending from a surface down to a BOP stack arranged subsea. The drilling riser comprises a drilling riser slip joint, an annular preventer arranged below the drilling riser slip joint, and at least one pressure relief device arranged in a lower part of the drilling riser. The at least one pressure relief device is configured to open so as to discharge a fluid from the drilling riser to the sea if a pressure difference between an inside and an outside of the drilling riser exceeds a predetermined threshold.
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公开(公告)号：US09828847B2
公开(公告)日：2017-11-28
申请号：US15317119
申请日：2015-05-21
Applicant: MHWIRTH AS
Inventor： Dag Vavik
CPC classification number: E21B47/0001 , E21B21/001 , E21B41/0007 , E21B44/00 , E21B47/06 , E21B47/065 , G01V9/005 , G01V11/002 , G01V99/005
Abstract: A method for predicting a formation of hydrates in a wellbore/riser annulus during a drilling operation. The method includes logging actual mud properties. Actual sets of pressure and temperature data at given locations/intervals in the wellbore or in the drilling riser annulus are continuously measured and/or calculated. A theoretical temperature profile for the formation of hydrates dependent on mud properties and pressure as a function of a true vertical depth in a well is determined. The theoretical temperature profile for the formation of hydrates in a control system is stored. The measured and/or calculated actual sets of pressure and temperature data is compared with the theoretical temperature profile for the formation of hydrates. A signal is issued if the measured and/or calculated actual sets of pressure and temperature data falls below or is lower than a predefined safety margin for the theoretical temperature profile for the formation of hydrates.
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