초록 ▼

For use with a core sample tool removing a sample from a formation of interest, a sonde supported sample receiving chamber is disclosed. It includes a main valve for sample insertion into a cavity in a resilient sleeve. The sleeve is in a chamber connected by suitable valved passages to enable ambie

For use with a core sample tool removing a sample from a formation of interest, a sonde supported sample receiving chamber is disclosed. It includes a main valve for sample insertion into a cavity in a resilient sleeve. The sleeve is in a chamber connected by suitable valved passages to enable ambient pressure at the cavity to equal downhole pressure; by valve operation this pressure can be maintained after chamber removal and transfer.

대표청구항 ▼

Apparatus for capturing a core sample cut from a formation of interest, comprising: (a) demountable chamber means having: (1) a surrounding housing; (2) a central, top located, core receiving opening; (3) a valve element with a core sized passage therethrough for receiving a core into said housing;

Apparatus for capturing a core sample cut from a formation of interest, comprising: (a) demountable chamber means having: (1) a surrounding housing; (2) a central, top located, core receiving opening; (3) a valve element with a core sized passage therethrough for receiving a core into said housing; (4) means for operating said valve element to open and close; and (5) an internal core receiving cavity formed by a surrounding resilient sleeve; (b) a fluid chamber surrounding said sleeve; (c) fluid pressure transfer means extending from the exterior of said chamber means to said fluid chamber; (d) first and second valve controlled fluid passage into said fluid chamber and internal cavity; (e) means for mounting said chamber means on a laboratory test instrument; and (f) means enabling a laboratory test instrument piston to extend into said chamber means to load the core in said cavity. A method of obtaining a core sample from a well borehole and placing the core sample in a removable core sample chamber including an internal core sample cavity and a fluid isolating wall defining said cavity around the core sample and the method comprises the steps of: (a) positioning the removable chamber in a sonde; (b) lowering in the borehole the sonde supporting a core cutter to enable cutting a core sample from a formation of interest; (c) controllably transferring the core sample by insertion of the core sample into the open removable chamber to receive the core sample and connate formation fluids; (d) isolating fluid in the chamber to equal the ambient pressure at the formation of interest after insertion of the core sample into the removable chamber; (e) sealing the cavity after core insertion; (f) opening a valve means to regulate fluid pressure on the wall to ambient pressure; (g) closing the core sample receiving removable chamber to capture the core sample; (h) measuring ambient conditions at the formation of interest; (i) retrieving the sonde from the well; and (j) removing the chamber with the core sample therein at the isolated pressure.