Downhole electromagnetic logging into place tool

• US 6,516,663 B2
• Filed: 02/06/2001
• Issued: 02/11/2003
• Est. Priority Date: 02/06/2001
• Status: Expired due to Term

• Current Assignee: Weatherford Technology Holdings, LLC (Weatherford International PLC)
• Original Assignee: Weatherford/Lamb Incorporated (Weatherford International PLC)
• Inventors: Wong, Arnold J.
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): WIGGINS, JOHN DAVID
• Application Number:
  US09/778,357
• Publication Number:
  US 20030000300A1
• Time in Patent Office: 735 Days
• Field of Search: 731/525.2, 731/521.4, 731/520.2, 166/254.2, 166/254.1, 166/250.01, 175/41, 175/45, 250/269.3
• US Class Current: 73/152.52
• CPC Class Codes: E21B 47/04 Measuring depth or liquid level
• CPC Class Codes: E21B 47/09 Locating or determining the position of objects in boreholes or wells , e.g. the position of an extending arm; Identifying the free or blocked portions of pipes

Abstract

Apparatus and method for accurately logging a drill-stem test tool into place as the DST tool is conveyed by drill pipe or tubing to the desired location are provided. One aspect of the invention provides an apparatus for logging into place a drill stem test tool, comprising: a drill string comprising drill pipes or tubings; a drill stem test tool disposed on the drill string; an electromagnetic telemetry tool disposed on the drill string; and a gamma ray tool connected to the electromagnetic telemetry tool. Another aspect of the invention provides a method for logging into place a drill stem test tool disposed on a drill string, comprising: lowering a drill stem test tool, an electromagnetic telemetry tool and a gamma ray tool disposed on a drill string into a wellbore; producing a partial log utilizing the gamma ray tool while the drill stem test tool is moved adjacent a correlative formation marker; compare the partial log to a well log to determine a depth position adjustment; and adjust a position of the drill stem test tool according to the depth position adjustment.

Claims

1. An apparatus for logging into place a drill stem test tool, comprising:

a drill string comprising drill pipes or tubings;

a drill stem test tool disposed on the drill string for facilitating a drill stem test;

an electromagnetic telemetry tool disposed on the drill string for transmitting information for determining a position of the drill stem test tool; and

a gamma ray tool connected to the electromagnetic telemetry tool.

2. The apparatus of claim 1 wherein the electromagnetic telemetry tool comprises:

a processor;

a battery connected to the processor; and

a transmitter/receiver disposed in communication with the processor.

3. The apparatus of claim 2 wherein the electromagnetic telemetry tool further comprises:

a modulator disposed in communication with the processor;

a preamplifier disposed in communication with the modulator; and

a power amplifier disposed in communication with the preamplifier and with the transmitter/receiver.

4. The apparatus of claim 2 wherein the electromagnetic telemetry tool further comprises:

a pressure sensor; and

a temperature sensor, both sensors disposed in communication with the processor.

5. The apparatus of claim 1 wherein the gamma ray tool comprises a radiation detector.

6. The apparatus of claim 5 wherein the gamma ray tool further comprises a telemetry tool interface disposed in communication with the electromagnetic telemetry tool.

7. The apparatus of claim 1, further comprising:

a surface system comprising a controller having input/output devices and a transmitter/receiver disposed in connection with the controller to communicate signals selectively with the telemetry tool and the gamma ray tool.

8. The apparatus of claim 7 wherein the surface system further comprises:

a modulator/demodulator connected between the transmitter/receiver and the controller.

9. The apparatus of claim 7 wherein the surface system further comprises a depth-measuring system for measuring a depth position of the gamma ray tool.

10. A method for logging into place a drill stem test tool disposed on all string, comprising:

lowering a drill stem test tool, an electromagnetic telemetry tool and a gamma ray tool disposed on a drill string into a wellbore;

producing a partial log utilizing the gamma ray tool while the drill stem test tool is moved adjacent a correlative formation marker;

comparing the partial log to a well log to determine a depth position adjustment; and

adjusting a position of the drill stem test tool according to the depth position adjustment.

11. The method of claim 10, further comprising:

transmitting signals representing data collected by the gamma ray tool to a surface system.

12. The method of claim 11 wherein the signals are transmitted utilizing an electromagnetic transmission method.

13. The method of claim 12 wherein the partial log is produced by correlating data collected by the gamma ray tool to depth/time data in a surface depth-measuring system.

14. The method of claim 10 wherein the drill string comprises a plurality of drill pipes or tubings and the drill stem test tool is lowered by connecting additional drill pipe or tubing to the drill string.

15. The method of claim 10 wherein the partial log is produced by raising the drill stem test tool past the correlative formation marker based on a measured length of the drill string.

16. The method of claim 10, further comprising:

transmitting a signal from a surface system to selectively activate the gamma ray tool.