Identifying landing of downhole equipment at a wellhead

1 . A method for detecting a landing configuration of equipment, the method comprising:

receiving an acoustic signal from at least one acoustic sensor located on an outer surface of surface equipment near a wellhead;

processing the acoustic signal resulting in a processed acoustic signal, wherein processing the acoustic signal includes:

normalizing the acoustic signal;

smoothing the acoustic signal; and

differentiating a background signal from the acoustic signal;

selecting a portion of the processed acoustic signal based on a thickness of the wellhead;

identifying a reflection characterization from the portion; and

based on the reflection characterization, identifying a landing configuration of the equipment with the wellhead.

2 . The method of claim 1 , wherein identifying the reflection characterization includes identifying an average or root mean square of the portion.

3 . The method of claim 1 , wherein identifying the landing configuration of the equipment with the wellhead includes comparing the reflection characterization to a predetermined threshold.

4 . The method of claim 1 , wherein normalizing the acoustic signal includes subtracting a maximum value of the acoustic signal from the acoustic signal.

5 . The method of claim 1 , wherein differentiating the background signal includes subtracting a pre-determined background signal.

6 . The method of claim 1 , wherein differentiating the background signal includes subtracting an average of historical signals.

7 . The method of claim 6 , wherein the historical signals include signals prior to contact of the equipment with the wellhead.

8 . The method of claim 1 , wherein smoothing the acoustic signal includes enveloping the acoustic signal.

9 . The method of claim 1 , wherein normalizing the acoustic signal results in a normalized acoustic signal, and wherein smoothing the acoustic signal includes smoothing the normalized acoustic signal resulting in a smoothed acoustic signal, and wherein differentiating the background signal includes subtracting the background signal from the smoothed acoustic signal.

10 . A wellhead landing detection system, comprising:

one or more acoustic sensors configured to be secured to an outer surface of a wellhead opposite or adjacent to a landing location at an inner surface of the wellhead; and

a processor and memory, the memory including instructions that cause the processor to:

emit an acoustic pulse from the one or more acoustic sensors;

receive a reflection of the acoustic pulse as an acoustic signal;

process the acoustic signal resulting in a processed acoustic signal, wherein processing the acoustic signal includes:

normalizing the acoustic signal;

smoothing the acoustic signal; and

differentiating a background signal from the acoustic signal;

select a portion of the processed acoustic signal based on a thickness of the wellhead;

identify a reflection characterization from the portion; and

based on the reflection characterization, identify a landing configuration of equipment with the wellhead.

11 . The wellhead landing detection system of claim 10 , wherein the one or more acoustic sensors include a plurality of acoustic sensors positioned around the outer surface of the wellhead and the acoustic pulse includes a plurality of acoustic pulses, and wherein each of the plurality of acoustic sensors emit one of the plurality of acoustic pulses.

12 . The wellhead landing detection system of claim 11 , wherein identifying the reflection characterization includes identifying a first reflection characterization based on a first acoustic sensor of the plurality of acoustic sensors and identifying a second reflection characterization based on a second acoustic sensor of the plurality of acoustic sensors, and wherein identifying the landing configuration of the equipment with the wellhead includes identifying the landing configuration based on the first reflection characterization and the second reflection characterization.

13 . The wellhead landing detection system of claim 12 , wherein the first acoustic sensor is located opposite the second acoustic sensor on the wellhead.

14 . The wellhead landing detection system of claim 10 , wherein differentiating the background signal includes identifying an average signal based on historical acoustic signals.

15 . The wellhead landing detection system of claim 10 , wherein the acoustic pulse is one of a plurality of acoustic pulses, and wherein emitting the acoustic pulse includes periodically emitting the plurality of acoustic pulses.

16 . The wellhead landing detection system of claim 15 , wherein the instructions further cause the processor to identify the background signal based on some of the plurality of acoustic pulses.

17 . The wellhead landing detection system of claim 10 , wherein the wellhead includes a production wellhead.

18 . A method for identifying a landing configuration, the method comprising:

emitting an acoustic pulse from an acoustic sensor located on an outer surface of a wellhead;

receiving a reflection of the acoustic pulse as an acoustic signal;

normalizing the acoustic signal;

smoothing the acoustic signal;

differentiating a background signal from the acoustic signal;

selecting a portion of the acoustic signal based on a thickness of the wellhead;

identifying a reflection characterization from the portion; and

based on the reflection characterization, identifying a landing configuration of equipment with the wellhead.