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.: US12848976Application Date: 2010-08-02
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Publication No.: US08256283B2Publication Date: 2012-09-04
- Inventor: Toru Terabayashi , Tsutomu Yamate , Hideki Kinjo , Akihito Chikenji , Takeaki Nakayama , Oliver C Mullins , Soraya Sofia Betancourt , Michael O'Keefe , Chengli Dong
- Applicant: Toru Terabayashi , Tsutomu Yamate , Hideki Kinjo , Akihito Chikenji , Takeaki Nakayama , Oliver C Mullins , Soraya Sofia 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 Jianguang Du; Jody DeStefanis
- Main IPC: E21B49/08
- IPC: E21B49/08
Abstract:
A downhole characterization apparatus for formation fluids is provided. The apparatus comprises a downhole tool including a flowline for flowing the formation fluids capable of isolating a quantity of the formation fluids in a portion thereof; and a pump unit for depressurizing the isolated formation fluids; and a measurement controller which controls the downhole tool. The measurement controller includes a rough value estimation unit which estimates a rough value of the bubble point pressure of the formation fluids; and a speed controller which controls the depressurizing speed of the pump unit such that the isolated formation fluids are depressurized at a first speed to a certain pressure which is a predetermined value higher than said estimated rough value, and the isolated fluids are depressurized at a second speed which is slower than said first speed in order to measure a precise value of the bubble point pressure.
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