US 12,258,857 B2
Method to determine drilling-induced rock damage
Xuekai Sun, Beijing (CN); and Christopher Ayadiuno, Dhahran (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Jan. 13, 2022, as Appl. No. 17/647,887.
Claims priority of application No. 202111603470.3 (CN), filed on Dec. 24, 2021.
Prior Publication US 2023/0203943 A1, Jun. 29, 2023
Int. Cl. E21B 49/00 (2006.01); G01V 1/50 (2006.01)
CPC E21B 49/00 (2013.01) [G01V 1/50 (2013.01); G01V 2210/1299 (2013.01); G01V 2210/1429 (2013.01); G01V 2210/47 (2013.01); G01V 2210/6222 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of determining a drilling-induced rock damage map, comprising:
obtaining, using a sonic tool, a sonic dataset comprising a set of sonic waveforms recorded at each of a plurality of axial source positions along an axis of a wellbore,
wherein the sonic tool comprises at least one sonic source and a plurality of sonic receivers, and
wherein each of the set of sonic waveforms comprises a recording, by one of the plurality of sonic receivers, of sonic waves emitted by the sonic source;
determining, using a slowness time coherence method, a log of a P-wave slowness from the sonic dataset;
determining, using a tomographic method, a map of a P-wave velocity from the sonic dataset; and
determining the drilling-induced rock damage map by subtracting the log of the P-wave slowness from the map of the P-wave velocity at a plurality of depths along the axis of the wellbore.