Joseph L Perkins

US Patent:

48605816, Aug 29, 1989

Filed:

Sep 23, 1988

Appl. No.:

7/248867

Inventors:

Thomas H. Zimmerman - Houston TX
Julian J. Pop - Houston TX
Joseph L. Perkins - Sugar Land TX

Assignee:

Schlumberger Technology Corporation - Houston TX

International Classification:

E21B 4908

US Classification:

73155

Abstract:

The apparatus of the present invention relates to a down hole tool capable of extraction of valid samples and making pressure measurements useful in calculating formation permeability. The tool incorporates the features of a staddle packing to allow formation fluid specimens to be taken at large flow rates without depressing the pressure below the formation fluid bubble point. When used in combination with a pressure probe the tool is used to obtain meaningful permeability readings in a larger radius area than previously permitted with known dsigns. Additionally, the apparatus of the present invention allows flow control during the creation of the pressure pulse which enhances extraction of valid samples and the permeability determination. The apparatus may be modularly constructed so that in a single descent of the tool, a pressure profile of the zone of interest can be made, a fluid analysis can be made at each station, multiple uncontaminated fluid samples can be withdrawn at pressures above the bubble point, local vertical and horizontal permeability measurements can be made at each station, a packer module can be set at a location dictated by previous measurements and a large scale pressure build up test can be performed.

US Patent:

49361392, Jun 26, 1990

Filed:

Jul 10, 1989

Appl. No.:

7/377694

Inventors:

Thomas H. Zimmerman - Houston TX
Julian J. Pop - Houston TX
Joseph L. Perkins - Sugar Land TX

Assignee:

Schlumberger Technology Corporation - Houston TX

International Classification:

E21B 4910

US Classification:

73155

Abstract:

The apparatus of the present invention relates to a down hole tool capable of extraction of valid samples and making pressure measurements useful in calculating formation permeability. The tool incorporates the features of a straddle packer to allow formation fluid specimens to be taken at large flow rates without depressing the pressure below the formation fluid bubble point. When used in combination with a pressure probe the tool is used to obtain meaningful permeability readings in a larger radius area than previously permitted with known designs. Additionally, the apparatus of the present invention allows flow control during the creation of the pressure pulse which enhances extraction of valid samples and the permeability determination. The apparatus may be modularly constructed so that in a single descent of the tool, a pressure profile of the zone of interest can be made, a fluid analysis can be made at each station, multiple uncontaminated fluid samples can be withdrawn at pressures above the bubble point, local vertical and horizontal permeability measurements can be made at each station, a packer module can be set at a location dictated by previous measurements and a large scale pressure build up test can be performed.