Methods and apparatuses for measurement of the strengths, pore pressures, and mechanical properties of low permeability geologic materials
Triaxial test apparatus is described for testing rock samples in a housing fillable with confining fluid for providing confining pressure, the housing having a channel for introduction therein and removal therefrom of the confining fluid, the housing having an opening there through which a portion of a load piston sealingly extends for providing a load on the sample, the triaxial test apparatus comprising sample mounting means for mounting the sample within the housing, the sample mounting means including a top end cap for mounting at the top and a bottom end cap for disposition at the bottom of the sample, the bottom end cap housing a body and a pore pressure channel in the body in fluid communication with the bottom of the sample and into which flows sample fluid expelled from the sample during testing, the sample fluid contacting an inert fluid in the pore pressure channel, a bottom end cap chamber in the body of the bottom end cap in fluid communication with the pore pressure channel, the bottom end cap chamber for containing an amount of the inert fluid, a pore pressure transducer disposed in the bottom end cap chamber for reacting to and sensing changes in the amount of sample fluid expelled from the sample during testing, wiring connected to the pore pressure transducer and extending therefrom and out of the body, the wiring connectable to a system for monitoring and recording changes sensed by the pore pressure transducer, the pore pressure channel and the bottom end cap chamber filled with the inert fluid, the inert fluid immiscible with the sample fluid, at least one flexible impermeable jacket for enclosing the surface of the sample other than its ends and preventing the confining fluid from directly contacting the sample and preventing sample fluid from being expelled from the portion of the sample covered by the jacket, and the bottom end cap suitable for mounting on a load cell mounted within the housing.
- Assignee:
- Exxon Production Research Co., Houston, TX (United States)
- Patent Number(s):
- US 5226310; A
- Application Number:
- PPN: US 7-577326
- OSTI ID:
- 7369209
- Resource Relation:
- Patent File Date: 31 Aug 1990
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hydraulically activated firing head for well perforating guns
Method of making an electrochemical sensing cell
Related Subjects
42 ENGINEERING
MEASURING INSTRUMENTS
DESIGN
RESERVOIR ROCK
MECHANICAL PROPERTIES
PORE PRESSURE
COVERINGS
DATA ACQUISITION SYSTEMS
FLUID FLOW
MECHANICAL TESTS
MONITORS
PERMEABILITY
SAMPLE HOLDERS
TRANSDUCERS
MATERIALS TESTING
TESTING
580000* - Geosciences
420500 - Engineering- Materials Testing