IP Library › Granted Patent US 12,644,373
Granted Patent B2
US 12,644,373 · App. 18/743,216 · Granted Jun 2, 2026

Systems and methods for multi-offset seismic profiling

Inventors: Farhan Naseer (Houston, TX); Huseyin R. Seren (Houston, TX); Weichang Li (Katy, TX)
Assignee: SAUDI ARABIAN OIL COMPANY
E21B47/01E21B47/04G01V1/50G01V1/52
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Quick Facts
Patent No.
US 12,644,373
App. No.
18/743,216
Granted
Jun 2, 2026
Kind
B2
Abstract

In some cases methods are discussed that comprise: releasing an untethered multi-offset sensor system into the wellbore; attaching the first sensor element to a wellbore casing in the wellbore; after attaching the first sensor to the wellbore casing, attaching the second sensor element to the wellbore casing in the wellbore with the first cable fully extended; and after attaching the second sensor to the wellbore casing, attaching the third sensor element to the wellbore casing in the wellbore with the second cable fully extended. Of course, other systems, methods, and apparatus are discussed.

Claims (69)

1 . A method for deploying sensors in a wellbore, the method comprising:

releasing an untethered multi-offset sensor system into the wellbore, wherein the untethered multi-offset sensor system includes at least a first sensor element, a second sensor element, and a third sensor element, wherein the first sensor element is connected to the second sensor element by a first cable, and wherein the second sensor element is connected to the third sensor element by a second cable;

attaching the first sensor element to a wellbore casing in the wellbore;

after attaching the first sensor element to the wellbore casing, attaching the second sensor element to the wellbore casing in the wellbore with the first cable fully extended,

wherein the first sensor element is attached to the wellbore casing at a location lower in the wellbore than the second sensor element, and wherein the first cable is fully extended due to a positive buoyancy in fluids in the wellbore of one or more elements of the untethered multi-offset sensor system located less deep in the wellbore than the first sensor element; and

after attaching the second sensor element to the wellbore casing, attaching the third sensor element to the wellbore casing in the wellbore with the second cable fully extended.

2 . The method of claim 1 , the method further comprising:

after attaching the first sensor element to the wellbore casing and before attaching the second sensor element to the wellbore casing, determining that the first cable is fully extended.

3 . The method of claim 2 , wherein determining that the first cable is fully extended is based at least in part upon a depth sensor in the second sensor element indicating a stable depth.

4 . The method of claim 1 ,

wherein the first sensor element comprises a first selectably detachable ballast, and

wherein the method further comprises attaching the first selectably detachable ballast to the first sensor element, the attaching comprising modifying a magnetic field created by an electromagnet in the first sensor element.

5 . The method of claim 1 , wherein each of the first sensor element, the second sensor element, and the third sensor element includes a seismic sensor configured to sense seismic data.

6 . The method of claim 5 , the method further comprising:

sensing the seismic data using the seismic sensors in each of the first sensor element, the second sensor element, and the third sensor element;

time stamping the sensed seismic data in each of the first sensor element, the second sensor element, and the third sensor element that sensed the seismic data;

storing the time stamped seismic data in each of the first sensor element, the second sensor element, and the third sensor element that sensed the seismic data;

retrieving the untethered multi-offset sensor system from the wellbore;

accessing the time stamped seismic data from each of the first sensor element, the second sensor element, and the third sensor element; and

generating a vertical seismic profile using the time stamped seismic data.

7 . The method of claim 1 , wherein the first sensor element comprises a first selectably detachable ballast configured to render the first sensor element negatively buoyant in a fluid in the wellbore, wherein the second sensor element comprises a second selectably detachable ballast configured to render the second sensor element negatively buoyant in the fluid in the wellbore, wherein the third sensor element comprises a third selectably detachable ballast configured to render the third sensor element negatively buoyant in the fluid in the wellbore, wherein the first sensor element is attached to the wellbore casing at a first location higher in the wellbore than the second sensor element, wherein the second sensor element is attached to the wellbore casing at a second location higher in the wellbore than the third sensor element, the method further comprising:

retrieving the untethered multi-offset sensor system from the wellbore, wherein retrieving the untethered multi-offset sensor system from the wellbore comprises:

selectably detaching the third ballast from the third sensor element rendering the third sensor element positively buoyant in the fluid of the wellbore;

detaching the third sensor element from the wellbore casing;

after detaching the third sensor element from the wellbore casing, selectably detaching the second ballast from the second sensor element rendering the second sensor element positively buoyant in the fluid of the wellbore;

detaching the second sensor element from the wellbore casing;

after detaching the second sensor element from the wellbore casing, selectably detaching the first ballast from the first sensor element rendering the first sensor element positively buoyant in the fluid of the wellbore;

detaching the first sensor element from the wellbore casing; and

gathering each of the first sensor element, the second sensor element, and the third sensor element at a surface of the wellbore.

8 . The method of claim 7 , wherein selectably detaching the first ballast from the first sensor element comprises modifying a magnetic field created by an electromagnet in the first sensor element.

9 . The method of claim 8 , wherein the electromagnet is a first electromagnet, and wherein detaching the first sensor element from the wellbore comprises modifying a magnetic field created by a second electromagnet in the first sensor element.

10 . The method of claim 7 , the method comprising:

waiting a delay period between detaching the second sensor element from the wellbore casing and detaching the first sensor element from the wellbore casing.

11 . The method of claim 7 , the method comprising:

detaching the first cable from at least one of the first sensor element or the second sensor element before detaching the second sensor element from the wellbore casing.

12 . The method of claim 1 , wherein the first cable is configured to carry communications between the first sensor element and the second sensor element.

13 . A method for deploying sensors in a wellbore, the method comprising:

attaching an untethered multi-offset sensor system to a wellbore casing in the wellbore, wherein the untethered multi-offset sensor system includes at least a first sensor element, a second sensor element, and a third sensor element, wherein the first sensor element is connected to the second sensor element by a first cable, and wherein the second sensor element is connected to the third sensor element by a second cable, wherein the first sensor element comprises a first selectably detachable ballast configured to render the first sensor element negatively buoyant in a fluid in the wellbore, wherein the second sensor element comprises a second selectably detachable ballast configured to render the second sensor element negatively buoyant in the fluid in the wellbore, wherein the third sensor element comprises a third selectably detachable ballast configured to render the second sensor element negatively buoyant in the fluid in the wellbore, wherein the first sensor element is attached to the wellbore casing at a first location higher in the wellbore than the second sensor element, wherein the second sensor element is attached to the wellbore casing at a second location higher in the wellbore than the third sensor element;

selectably detaching the first ballast from the first sensor element rendering the first sensor element positively buoyant in the fluid of the wellbore;

detaching the first sensor element from the wellbore casing;

after detaching the first sensor element from the wellbore casing, selectably detaching the second ballast from the second sensor element rendering the second sensor element positively buoyant in the fluid of the wellbore;

detaching the second sensor element from the wellbore casing;

after detaching the second sensor element from the wellbore casing, selectably detaching the third ballast from the third sensor element rendering the third sensor element positively buoyant in the fluid of the wellbore;

detaching the third sensor element from the wellbore casing; and

gathering each of the first sensor element, the second sensor element, and the third sensor element at a surface of the wellbore.

14 . The method of claim 13 , wherein selectably detaching the first ballast from the first sensor element comprises modifying a magnetic field created by an electromagnet in the first sensor element.

15 . The method of claim 14 , wherein the electromagnet is a first electromagnet, and wherein detaching the first sensor element from the wellbore comprises modifying a magnetic field created by a second electromagnet in the first sensor element.

16 . The method of claim 13 , the method comprising:

detaching the first cable from at least one of the first sensor element or the second sensor element before detaching the second sensor element from the wellbore casing.

17 . A untethered multi-offset sensor system, the system comprising:

a first sensor element comprising:

a first seismic sensor;

a first detachable ballast;

a first electromagnet configured to selectably attach the first detachable ballast to the first sensor element;

a second electromagnet configured to secure the first sensor element to a wellbore casing;

a second sensor element comprising:

a second seismic sensor;

a second detachable ballast;

a third electromagnet configured to selectably attach the second detachable ballast to the second sensor element;

a fourth electromagnet configured to secure the second sensor element to the wellbore casing;

a third sensor element comprising:

a third seismic sensor;

a third detachable ballast;

a fifth electromagnet configured to selectably attach the second detachable ballast to the second sensor element;

a sixth electromagnet configured to secure the second sensor element to the wellbore casing;

wherein a combination of the first sensor element with the first ballast attached, the second sensor element with the second ballast attached, and the third sensor element with the third ballast attached is negatively buoyant in a fluid in the wellbore, and wherein upon detaching one or more of the first ballast, the second ballast, or the third ballast, the untethered multi-offset sensor system becomes positively buoyant in the fluid in the wellbore;

wherein the first sensor element is attached to the second sensor element by a first cable, and wherein a length of the first cable is fixed and defines a deployment location of the first sensor element relative to the second sensor element; and

wherein the second sensor element is attached to the third sensor element by a second cable, and wherein a length of the second cable is fixed and defines a deployment location of the second sensor element relative to the third sensor element.

18 . The system of claim 17 , wherein at least one of the first sensor element and the second sensor element includes a connector actuator configured to selectably detach the first cable.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 5, 2025
From: ARAMCO SERVICES COMPANY
To: SAUDI ARAMCO UPSTREAM TECHNOLOGIES COMPANY
Reel/Frame 070418/0329 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Mar 5, 2025
From: SAUDI ARAMCO UPSTREAM TECHNOLOGIES COMPANY
To: SAUDI ARABIAN OIL COMPANY
Reel/Frame 070418/0366 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Nov 1, 2024
From: NASEER, FARHAN; SEREN, HUSEYIN R.; LI, WEICHANG
To: ARAMCO SERVICES COMPANY
Reel/Frame 069101/0662 →
Continuity (1)
Related Publication 20250383466A1 · Dec 18, 2025
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