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公开(公告)号：US20170122046A1
公开(公告)日：2017-05-04
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：US20170138170A1
公开(公告)日：2017-05-18
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 or in a riser annulus includes logging actual mud properties, continuously measuring and/or calculating actual sets of pressure and temperature data at given locations/intervals in the wellbore or in the riser annulus, determining 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, storing the theoretical temperature profile for the formation of hydrates in a control system, comparing the measured and/or calculated actual sets of pressure and temperature data with the theoretical temperature profile for the formation of hydrates, and issuing a signal from a control system 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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公开(公告)号：US20160215587A1
公开(公告)日：2016-07-28
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 pre-determined threshold.
Abstract translation: 深水钻井立管压力释放系统包括从表面向下延伸到布置的海底的BOP堆叠的钻井立管。 钻井立管包括钻井立管滑动接头，布置在钻井立管滑动接头下方的环形防护器，以及布置在钻井立管下部的至少一个压力释放装置。 至少一个压力释放装置构造成打开，以便如果钻井立管的内部和外部之间的压力差超过预定阈值，则将流体从钻井立管排出到海洋。
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公开(公告)号：US20170350213A1
公开(公告)日：2017-12-07
申请号：US15537886
申请日：2015-11-12
Applicant: MHWIRTH AS
Inventor： DAG VAVIK
CPC classification number: E21B34/08 , E21B17/01 , E21B21/001 , E21B21/08 , E21B21/103 , E21B33/064 , E21B34/063
Abstract: A protection system for a drilling riser. The drilling riser includes a main drilling riser bore and a drilling riser annulus and extends from a floating installation to a location on a seafloor and is fluidly connected to a subsea BOP. The system includes a fluid conduit which extends from the floating installation to a lower region of the drilling riser. The fluid conduit is fluidly connected with the drilling riser annulus in the drilling riser. The fluid conduit provides at least one of a rapid pressure relief and a fluid bypass for the main drilling riser bore to prevent the drilling riser from an uncontrolled pressure build-up due to an inadvertent plugging or a restriction resulting in a maximum allowable working pressure (MAWP) of the drilling riser being exceeded, if a restriction, a plug or a blockage exists in the drilling riser annulus or in riser outlets.
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