Borehole porosity testing device

Claim 1

A DEVICE FOR INVESTIGATION THE CHARACTER OF AN EARTH FORMATION TRAVERSED BY A BOREHOLE COMPRISING: A SUPPORT ADAPTED TO BE LOCATED AT DESIRED DEPTH WITHIN A BOREHOLE OPPOSITE A FORMATION TO BE INVESTIGATED; A CHAMBER IN SAID SUPPORT CONTAINING A FIRST FLUID DISTINCTIVE FROM FLUIDS SATURATING THE FORMATION ABOUT THE BOREHOLE; A FIRST MEANS MOUNTED ON SAID SUPPORT FOR ISOLATING A FIRST BOREHOLE WALL FORMATION PORTION FROM BOREHOLE FLUIDS AND FOR ESTABLISHING FLUID COMMUNICATION WITH SAID FORMATION PORTION WHEN ENGAGED THEREWITH; A SECOND MEANS MOUNTED ON SAID SUPPORT FOR ISOLATING A SECOND BOREHOLE WALL FORMATION PORTION FROM BOREHOLE FLUIDS AND FOR ESTABLISHING FLUID COMMUNICATION WITH SAID SECOND FORMATION PORTION WHEN ENGAGED THEREWITH; MOTIVE MEANS IN SAID BODY FOR MOVING SAID FIRST AND SECOND MEANS INTO ENGAGEMENT WITH THE WALL OF THE BOREHOLE AT LOCATIONS SPACED FROM ONE ANOTHER; FIRST AND SECOND FLUID CHANNELS RESPECTIVELY COMMUNICATING BETWEEN SAID FIRST MEANS AND SAID CHAMBER AND BETWEEN SAID SECOND MEANS AND SAID CHAMBER; MEANS IN SAID SUPPORT FOR INDUCING SAID FIRST FLUID TO DISPLACE FROM SAID CHAMBER VIA SAID FIRST CHANNEL AND FIRST MEANS INTO THE FORMATION AT SAID FIRST BOREHOLE WALL FORMATION PORTION, WITHIN SAID INFORMATION BETWEEN SAID SPACED LOCATIONS AND BACK THROUGH SAID SECOND MEANS, SAID SECOND FLUID CHANNEL, AND INTO SAID CHAMBER; MEANS IN SAID SUPPORT FOR MEASURING THE QUANTITY OF SAID FIRST FLUID DISPLACED FROM SAID CHAMBER AT ANY POINT OF TIME; AND MEANS IN SAID SECOND CHANNEL FOR DETECTING THE ARRIVAL TIME OF SAID FIRST FLUID WITHIN SAID SECOND CHANNEL, SAID QUANTITY AT SAID ARRIVAL TIME BEING A MEASURE OF THE VOLUME OF FORMATION FLUIDS DISPLACED BY SAID FIRST FLUID AND HENCE A MEASURE OF THE PERMEABILITY OF THE FORMATION UNDER INVESTIGATION.

Claim 2

A DEVICE FOR INVESTIGATION THE CHARACTER OF AN EARTH FORMATION TRAVERSED BY A BOREHOLE COMPRISING: A SUPPORT ADAPTED TO BE LOCATED AT DESIRED DEPTH WITHIN A BOREHOLE OPPOSITE A FORMATION TO BE INVESTIGATED; A CHAMBER IN SAID SUPPORT CONTAINING A FIRST FLUID DISTINCTIVE FROM FLUIDS SATURATING THE FORMATION ABOUT THE BOREHOLE; A FIRST MEANS MOUNTED ON SAID SUPPORT FOR ISOLATING A FIRST BOREHOLE WALL FORMATION PORTION FROM BOREHOLE FLUIDS AND FOR ESTABLISHING FLUID COMMUNICATION WITH SAID FORMATION PORTION WHEN ENGAGED THEREWITH; A SECOND MEANS MOUNTED ON SAID SUPPORT FOR ISOLATING A SECOND BOREHOLE WALL FORMATION PORTION FROM BOREHOLE FLUIDS AND FOR ESTABLISHING FLUID COMMUNICATION WITH SAID SECOND FORMATION PORTION WHEN ENGAGED THEREWITH; MOTIVE MEANS IN SAID BODY FOR MOVING SAID FIRST AND SECOND MEANS INTO ENGAGEMENT WITH THE WALL OF THE BOREHOLE AT LOCATIONS SPACED FROM ONE ANOTHER; FIRST AND SECOND FLUID CHANNELS RESPECTIVELY COMMUNICATING BETWEEN SAID FIRST MEANS AND SAID CHAMBER AND BETWEEN SAID SECOND MEANS AND SAID CHAMBER; MEANS IN SAID SUPPORT FOR INDUCING SAID FIRST FLUID TO DISPLACE FROM SAID CHAMBER VIA SAID FIRST CHANNEL AND FIRST MEANS INTO THE FORMATION AT SAID FIRST BOREHOLE WALL FORMATION PORTION, WITHIN SAID INFORMATION BETWEEN SAID SPACED LOCATIONS AND BACK THROUGH SAID SECOND MEANS, SAID SECOND FLUID CHANNEL, AND INTO SAID CHAMBER; MEANS IN SAID SUPPORT FOR MEASURING THE QUANTITY OF SAID FIRST FLUID DISPLACED FROM SAID CHAMBER AT ANY POINT OF TIME; AND MEANS IN SAID SECOND CHANNEL FOR DETECTING THE ARRIVAL TIME OF SAID FIRST FLUID WITHIN SAID SECOND CHANNEL, SAID QUANTITY AT SAID ARRIVAL TIME BEING A MEASURE OF THE VOLUME OF FORMATION FLUIDS DISPLACED BY SAID FIRST FLUID AND HENCE A MEASURE OF THE PERMEABILITY OF THE FORMATION UNDER INVESTIGATION.