# US 2016/0356147 A1 · Methods and systems for downhole temperature logging

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- Number: US 2016/0356147 A1
- Document ID: US20160356147A1
- Status: Published application
- Kind: A1
- Application number: 15/021,853
- Filed: 2015-01-28
- Published: 2016-12-08
- Earliest claimed: 2015-01-28
- Assignees: Halliburton Energy Services, Inc.
- Applicants: Halliburton Energy Services, Inc.
- Inventors: Peng Li; Lianhe Guo; Wesley N. Ludwing
- Web page: https://patentgrep.com/patent/US20160356147A1

## CPC

- E21B 47/07: Temperature
- E21B 17/20: Flexible or articulated drilling pipes {, e.g. flexible or articulated rods, pipes or cables}
- E21B 47/26: Storing data down-hole, e.g. in a memory or on a record carrier
- E21B 47/12: Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A downhole temperature logging method includes deploying a temperature logging device into a borehole, the temperature logging device having a mechanical drive and at least one shape memory alloy (SMA) unit. The method also includes deforming the SMA unit in response to a temperature or temperature range, wherein the deforming causes marks to a medium. The method also includes retrieving the medium and analyzing the marks.

## Claims

### Claim 1

A downhole temperature logging method comprising:
deploying a temperature logging device into a borehole, said temperature logging device having a mechanical drive and at least one shape memory alloy (SMA) unit;
deforming the at least one SMA unit in response to a temperature or temperature range, wherein said deforming results in marks to a medium; and
retrieving the medium from the borehole and analyzing the marks.

### Claim 2 (depends on 1)

The method of claim 1, wherein the medium is a metal foil, and wherein deforming the at least one SMA unit causes marks on or through the metal foil.

### Claim 3 (depends on 1)

The method of claim 1, further comprising scanning the marks and generating a temperature log based on the scanned marks.

### Claim 4 (depends on 1)

The method of claim 1, wherein said medium is stationary in relation to the at least one SMA unit.

### Claim 5 (depends on 1)

The method of claim 1, further comprising moving the medium in relation to the at least one SMA unit as a function of time using the mechanical drive.

### Claim 6 (depends on 1)

The method of claim 1, further comprising moving the medium in relation to the at least one SMA unit as a function of measured depth using the mechanical drive.

### Claim 7 (depends on 1)

The method of claim 1, further comprising winding the mechanical drive before said deploying.

### Claim 8 (depends on 7)

The method of claim 7, further comprising winding the mechanical drive during said deploying based on movement of the temperature logging device or another device coupled to the temperature logging device.

### Claim 9 (depends on 1)

The method of claim 1, wherein deforming the at least one SMA unit in response to a temperature or temperature range comprises deforming a plurality of SMA units responsive to different temperature ranges.

### Claim 10 (depends on 1)

The method of claim 1, wherein the temperature logging device is part of a bottom hole assembly (BHA) or wireline tool string.

### Claim 11 (depends on 1)

The method of claim 1, wherein the temperature logging device is powered only by the mechanical drive.

### Claim 12

A downhole temperature logging system that comprises:
at least one shape memory alloy (SMA) unit;
a medium that receives marks due to deformation of the at least one SMA unit in response to a temperature or temperature range; and
a mechanical drive that moves the medium in relation to the at least one SMA unit as a function of time or measured depth.

### Claim 13 (depends on 12)

The system of claim 12, wherein the mechanical drive comprises a hand-wound clock component.

### Claim 14 (depends on 12)

The system of claim 12, wherein the mechanical drive comprises a self-winding clock component.

### Claim 15 (depends on 12)

The system of claim 12, further comprising a winding element separate from the mechanical drive, the winding element being configured to wind the mechanical drive in response to being moved in a downhole environment.

### Claim 16 (depends on 12)

The system of claim 12, wherein the medium is a metal foil.

### Claim 17 (depends on 12)

The system of claim 12, wherein each SMA unit comprises a contact point, a spring, and SMA material.

### Claim 18 (depends on 19)

The system of claim 19, wherein the spring causes the contact point to press against the medium, and wherein deformation of the SMA material as a function of temperature changes an amount of pressure applied by the contact point to the medium.

### Claim 19 (depends on 12)

The system of claim 12, wherein the temperature logging device comprises a plurality of SMA units responsive to different temperatures or temperature ranges.

### Claim 20 (depends on 12)

The system of claim 12, wherein the at least one SMA unit, the medium, and the mechanical drive are components of a temperature logging device included with a bottom hole assembly (BHA) or wireline tool string.