Invention Grant
- Patent Title: Method of downhole characterization of formation fluids, measurement controller for downhole characterization of formation fluids, and apparatus for downhole characterization of formation fluids
- Patent Title (中): 地层流体井下表征方法，地层流体井下特征测量控制器，地层流体井下表征装置
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Application No.: US11858139Application Date: 2007-09-20
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Publication No.: US07788972B2Publication Date: 2010-09-07
- Inventor: Toru Terabayashi , Tsutomu Yamate , Hideki Kinjo , Akihito Chikenji , Takeaki Nakayama , Oliver C. Mullins , Soraya S. Betancourt , Michael O'Keefe , Chengli Dong
- Applicant: Toru Terabayashi , Tsutomu Yamate , Hideki Kinjo , Akihito Chikenji , Takeaki Nakayama , Oliver C. Mullins , Soraya S. Betancourt , Michael O'Keefe , Chengli Dong
- Applicant Address: US TX Sugar Land
- Assignee: Schlumberger Technology Corporation
- Current Assignee: Schlumberger Technology Corporation
- Current Assignee Address: US TX Sugar Land
- Agent Daryl Wright; Jody DeStefanis; Jeff Griffin
- Main IPC: E21B49/08
- IPC: E21B49/08
Abstract:
A method of downhole characterization of formation fluids is provided. The method includes: estimating a rough value of the bubble point pressure of the formation fluids; depressurizing the formation fluids at a first speed to a certain pressure which is a predetermined value higher than the estimated rough value while the formation fluids are isolated in a portion of the flowline; and depressurizing the isolated fluids at a second speed which is slower than the first speed in order to measure a precise value of the bubble point pressure.
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