Back to results
US 7,395,703 B2Granted
Formation testing apparatus and method for smooth draw down
AssigneeBaker Hughes Incorporated
InventorsEick Niemeyer, Tobias Kischkat, Matthias Meister
Life of this patent
Estimating the term…
Abstract
A method and apparatus for of determining a formation parameter of interest. The method includes placing a tool into communication with the formation to test the formation and drawing down a test volume at an increasing draw rate during a first draw period and decreasing the draw rate during a second draw period to create a smooth draw down cycle. The draw down can be step-wise or continuous. The formation parameter is determined using formation rate analyis and characteristics determined during the draw down cycle.
Claims42
A method of determining in situ a desired formation parameter of interest comprising:
- a) conveying a tool into a well borehole traversing a formation;
- b) establishing fluid communication between the tool and the formation, the tool having a test volume for accepting fluid from the formation;
- c) drawing fluid into the test volume, the drawing including a first draw portion and a second draw portion;
- d) controlling a draw rate during at least one of the first draw portion and the second draw portion, the draw rate being controlled according to one or more of i) increasing the draw rate a plurality of times during the first draw portion, and ii) decreasing the draw rate a plurality of times during the second draw portion, wherein increasing the draw rate includes at least one of i) increasing the draw rate continuously during the first draw portion and ii) increasing the draw rate in a step-wise manner during the first draw portion;
- and
- e) determining at least one characteristic of the test volume during one or more of the first draw portion and the second draw portion, the determined characteristic being indicative of the formation parameter of interest.
3 more elements
A method of determining in situ a desired formation parameter of interest comprising:
- a) conveying a tool into a well borehole traversing a formation;
- b) establishing fluid communication between the tool and the formation, the tool having a test volume for accepting fluid from the formation;
- c) drawing fluid into the test volume, the drawing including a first draw portion and a second draw portion;
- d) controlling a draw rate during at least one of the first draw portion and the second draw portion, and
- e) determining at least one characteristic indicative of the formation parameter of interest during one or more of the first draw portion and the second draw second draw portion, wherein determining the at least one characteristic includes using formation rate analysis at least in part to determine the at least one characteristic.
2 more elements
A method of determining in situ a desired formation parameter of interest comprising:
- a) conveying a tool into a well borehole traversing a formation;
- b) establishing fluid communication between the tool and the formation, the tool having a test volume for accepting fluid from the formation;
- c) drawing fluid into the test volume, the drawing including a first draw portion and a second draw portion;
- d) controlling a draw rate during at least one of the first draw portion and the second draw portion, and
- e) determining at least one characteristic indicative of the formation parameter of interest during one or more of the first draw portion and the second draw portion, wherein decreasing the draw rate includes at least one of i) decreasing the draw rate continuously during the second draw portion and ii) decreasing the draw rate in a step-wise manner during the second draw portion.
2 more elements
An apparatus for determining in situ a desired formation parameter of interest comprising:
- a) a tool conveyable into a well borehole traversing a formation;
- b) a test unit in the tool, the test unit being adapted for fluid communication with the formation, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume for controlling a draw rate of the fluid being drawn into in the test volume, the control device being operable to control the draw rate according to one or more of i) increasing the draw rate a plurality of times during a first draw portion, and ii) decreasing the draw rate a plurality of times during a second draw portion, wherein the control device increases the draw rate by at least one of i) increasing the draw rate continuously during the first draw portion and ii) increasing the draw rate in a step-wise manner during the first draw portion;
- and
- d) a sensing device for determining at least one characteristic of the test volume during one or more of the first draw portion and the second draw portion, the determined characteristic being indicative of the formation parameter of interest.
2 more elements
An apparatus for determining in situ a desired formation parameter of interest comprising:
- a) a tool conveyable into a well borehole traversing a formation;
- b) a test unit in the tool, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume controlling a draw rate of the fluid being drawn into in the test volume, the control device being operable to control the draw rate according to one or more of i) increasing the draw rate during a first draw portion, and ii) decreasing the draw rate during a second draw portion;
- d) a sensing device for determining at least one characteristic indicative of the formation parameter of interest during one or more of the first draw portion and the second draw portion;
- wherein the test volume comprises a variable volume and the control device controls the draw rate by varying the volume of the variable volume.
2 more elements
An apparatus for determining in situ a desired formation parameter of interest comprising:
- a) a tool conveyable into a well borehole traversing a formation;
- b) a test unit in the tool, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume controlling a draw rate of the fluid being drawn into in the test volume, the control device being operable to control the draw rate according to one or more of i) increasing the draw rate during a first draw portion, and ii) decreasing the draw rate during a second draw portion;
- d) a sensing device for determining at least one characteristic indicative of the formation parameter of interest during one or more of the first draw portion and the second draw portion;
- and
- e) a processor processing an output of the sensing device using a formation rate analysis program to determine the at least one characteristic.
3 more elements
An apparatus for determining in situ a desired formation parameter of interest comprising:
- a) a tool conveyable into a well borehole traversing a formation;
- b) a test unit in the tool, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume controlling a draw rate of the fluid being drawn into in the test volume, the control device being operable to control the draw rate according to one or more of i) increasing the draw rate during a first draw portion, and ii) decreasing the draw rate during a second draw portion;
- d) a sensing device for determining at least one characteristic indicative of the formation parameter of interest during one or more of the first draw portion and the second draw portion;
- wherein the control device decreases the draw rate by at least one of i) decreasing the draw rate continuously during the second draw portion and ii) decreasing the draw rate in a step-wise manner during the second draw portion.
2 more elements
A system for determining in situ a desired formation parameter of interest comprising:
- a) a work string for conveying a tool into a well borehole traversing a formation;
- b) a test unit in the tool, the test unit being adapted for fluid communication with the formation, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume for controlling a draw rate of the fluid being drawn into in the test volume, the control device being operable to control the draw rate according to one or more of i) increasing the draw rate a plurality of times during a first draw portion, and ii) decreasing the draw rate a decreasing the draw rate a plurality of times during a second draw portion, wherein the control device increases the draw rate by at least one of i) increasing the draw rate continuously during the first draw portion and ii) increasing the draw rate in a step-wise manner during the first draw portion;
- d) a sensing device for determining at least one characteristic of the test volume during one or more of the first draw portion and the second draw portion;
- e) a processor receiving an output of the sensing device, the processor processing the received output according to programmed instructions, the formation parameter of interest being determined at least in part by the processed output.
2 more elements
A system for determining in situ a desired formation parameter of interest comprising:
- a) a string conveyable into a well borehole traversing a formation;
- b) a test unit in the string, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume controlling a draw rate of the fluid being drawn into in the test volume, the control device controlling the draw rate according to one or more of i) increasing the draw rate during a first draw portion, and ii) decreasing the draw rate during a second draw portion;
- d) a sensing device for determining at least one characteristic of the test volume during one or more of the first draw portion and the second draw portion;
- e) a processor receiving an output of the sensing device, the processor processing the received output according to programmed instructions, the formation parameter of interest being determined at least in part by the processed output, wherein the test volume comprises a variable volume and the control device decreases the pressure of the test volume by varying the volume of the variable volume.
2 more elements
A system for determining in situ a desired formation parameter of interest comprising:
- a) a string conveyable into a well borehole traversing a formation;
- b) a test unit in the string, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume controlling a draw rate of the fluid being drawn into in the test volume, the control device controlling the draw rate according to one or more of i) increasing the draw rate during a first draw portion, and ii) decreasing the draw rate during a second draw portion;
- d) a sensing device for determining at least one characteristic of the test volume during one or more of the first draw portion and the second draw portion;
- e) a processor receiving an output of the sensing device, the processor processing the received output according to programmed instructions, the formation parameter of interest being determined at least in part by the processed output, wherein the programmed instructions include a formation rate analysis program to determine the first characteristic.
2 more elements
A system for determining in situ a desired formation parameter of interest comprising:
- a) a string conveyable into a well borehole traversing a formation;
- b) a test unit in the string, the test unit including a test volume for receiving fluid from the formation;
- c) a control device associated with the test volume controlling a draw rate of the fluid being drawn into in the test volume, the control device controlling the draw rate according to one or more of i) increasing the draw rate during a first draw portion, and ii) decreasing the draw rate during a second draw portion;
- d) a sensing device for determining at least one characteristic of the test volume during one or more of the first draw portion and the second draw portion;
- e) a processor receiving an output of the sensing device, the processor processing the received output according to programmed instructions, the formation parameter of interest being determined at least in part by the processed output, wherein the control device decreases the draw rate by at least one of i) decreasing the draw rate continuously during the second draw portion and ii) decreasing the draw rate in a step-wise manner during the second draw portion.
2 more elements
Dependencies are inferred from the claim text.