MEDICAL TOOLS AND DEVICES WITH IMPROVED ULTRASOUND VISIBILITY
申请人:GE Healthcare Limited
公开号:EP1155418B1
公开(公告)日:2007-04-11
Degradable Polymers for Wellbore Fluids and Processes
申请人:Abad Carlos
公开号:US20090075845A1
公开(公告)日:2009-03-19
A viscosifying agent for wellbore fluids is described including a polymer polymerized using at least two pre-polymers “A” and “B”, the polymer being capable of essentially fully degrading into soluble fragments after the initiation of a breaking process.
Degradable Friction Reducer
申请人:Abad Carlos
公开号:US20090105097A1
公开(公告)日:2009-04-23
Novel wellbore service fluids are disclosed. The fluid may include an aqueous solvent and a synthetic degradable polymer that is soluble in the solvent. In a controlled way the molecular weight of the polymer may be reduced in response to internal or external triggers at the required time and temperature. The polymers are formed by essentially non degradable polymer chains “polymer type A” copolymerized with essentially degradable polymer chains “polymer type B”. This feature of “selective degradation” is not present in any of the polymeric fluids known as friction reducers.