Method and apparatus to generate a crosswell data set

Patent metadata

Field	Value
Publication number	US-10209388-B2
Application number	US-201414223927-A
Country	US
Kind code	B2
Filing date	Mar 24, 2014
Priority date	Dec 20, 2013
Publication date	Feb 19, 2019
Grant date	Feb 19, 2019

Abstract

Systems, methods, and apparatuses to generate a crosswell data set are described. In certain aspects, a method includes producing a first electromagnetic field at the earth's surface with a transmitter at a first location, detecting in a first borehole a first field signal induced by the first electromagnetic field, detecting in a second borehole a second field signal induced by the first electromagnetic field, and generating a crosswell data set from the first field signal and the second field signal. A formation model may be created from the crosswell data set.

First claim

What is claimed is:

1. A crosswell logging system comprising:
a transmitter at the earth's surface producing an electromagnetic field;
a first receiver in a first borehole detecting a first field signal induced by the electromagnetic field;
a second receiver in a second borehole detecting a second field signal induced by the electromagnetic field produced by the transmitter at the earth's surface; and
a processing unit generating a crosswell data set from the first field signal and the second field signal, wherein the processing unit further comprises determining a difference between the first field signal and the second field signal;
wherein a global positioning system (GPS) phase synchronized clock associated to each receiver so that the crosswell dataset generated from the first and second field signals are recorded at the same time.

2. The crosswell logging system of claim 1 , wherein at least one of the first receiver and the second receiver comprises a multiple axis sensor.

3. The crosswell logging system of claim 2 , wherein the multiple axis sensor comprises a magnetometer.

4. The crosswell logging system of claim 1 , wherein the processing unit creates a formation model from the crosswell data set.

5. The crosswell logging system of claim 1 , wherein the transmitter is entirely above the earth's surface.

6. A crosswell logging system comprising:
producing a first electromagnetic field at the earth's surface with a transmitter at a first location;
detecting, by a first receiver, in a first borehole a first field signal induced by the first electromagnetic field;
detecting, by a second receiver, in a second borehole a second field signal induced by the first electromagnetic field; and
generating a crosswell data set from the first field signal and the second field signal, both induced by the electromagnetic field produced by the transmitter at the earth's surface, wherein generating the crosswell data set further comprises determining a difference between the first field signal and the second field signal;
wherein a global positioning system (GPS) phase synchronized clock associated to each receiver so that the crosswell dataset generated from the first and second field signals are recorded at the same time.

7. The method of claim 6 , wherein determining the difference between the first field signal and the second field signal comprises at least one of determining an amplitude difference between the first field signal and the second field signal and determining a phase angle difference between the first field signal and the second field signal.

8. The method of claim 6 , further comprising:
producing a second electromagnetic field at the earth's surface with the transmitter at a second location;
detecting in the first borehole a third field signal induced by the second electromagnetic field;
detecting in the second borehole a fourth field signal induced by the second electromagnetic field; and
wherein generating further comprises generating the crosswell data set from the third field signal and the fourth field signal.

9. The method of claim 8 , wherein the first electromagnetic field and the second electromagnetic field are produced at discrete times.

10. The method of claim 6 , further comprising creating a formation model from the crosswell data set.

11. The method of claim 10 , wherein creating the formation model comprises fitting a numerical model to the crosswell data set within a tolerance.

12. The method of claim 6 , further comprising:
detecting in a third borehole a third field signal induced by the first electromagnetic field; and
wherein generating comprises generating the crosswell data set from the first field signal, the second field signal, and the third field signal.

13. The method of claim 6 , wherein the first electromagnetic field is produced by the transmitter entirely above the earth's surface.

14. A crosswell logging system comprising:
a set of one or more processors; and
a set of one or more data storage devices that store instructions, that when executed by the set of processors, cause the set of one or more processors to perform the following: producing a first electromagnetic field at the earth's surface with a transmitter at a first location;
detecting, by a first receiver, in a first borehole a first field signal induced by the first electromagnetic field;
detecting, by a second receiver, in a second borehole a second field signal induced by the first electromagnetic field produced by the transmitter at the earth's surface; and
generating a crosswell data set from the first field signal and the second field signal including a difference between the first field signal and the second field signal;
wherein a global positioning system (GPS) phase synchronized clock associated to each receiver so that the crosswell dataset generated from the first and second field signals are recorded at the same time.

15. The apparatus of claim 14 , wherein the set of data storage devices further stores instructions, that when executed by the set of processors, cause the set of processors to perform the following:
wherein determining the difference between the first field signal and the second field signal comprises at least one of determining an amplitude difference between the first field signal and the second field signal and determining a phase angle difference between the first field signal and the second field signal.

16. The apparatus of claim 14 , wherein the set of data storage devices further stores instructions, that when executed by the set of processors, cause the set of processors to perform the following:
producing a second electromagnetic field at the earth's surface with the transmitter at a second location;
detecting in the first borehole a third field signal induced by the second electromagnetic field;
detecting in the second borehole a fourth field signal induced by the second electromagnetic field; and
wherein generating further comprises generating the crosswell data set from the third field signal and the fourth field signal.

17. The apparatus of claim 16 , wherein the set of data storage devices further stores instructions, that when executed by the set of processors, cause the set of processors to perform the following:
producing the first electromagnetic field and the second electromagnetic field at discrete times.

18. The apparatus of claim 14 , wherein the set of data storage devices further stores instructions, that when executed by the set of processors, cause the set of processors to perform the following:
creating a formation model from the crosswell data set.

19. The apparatus of claim 18 , wherein the set of data storage devices further stores instructions, that when executed by the set of processors, cause the set of processors to perform the following:
wherein creating the formation model comprises fitting a numerical model to the crosswell data set within a tolerance.

20. The apparatus of claim 14 , wherein the set of data storage devices further stores instructions, that when executed by the set of processors, cause the set of processors to perform the following:
detecting in a third borehole a third field signal induced by the first electromagnetic field; and
wherein generating comprises generating the crosswell data set from the first field signal, the second field signal, and the third field signal.

21. The apparatus of claim 14 , wherein the set of data storage devices further stores instructio

Assignees

• Schlumberger Technology Corp

Inventors

• Wilt Michael
• Zhang Ping
• Cuevas Nestor
• Chen Jiuping

Classifications

• G01V3/30 Primary

  operating with electromagnetic waves · CPC title