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### Inspection Detail

**Case Status: CLOSED**

#### **Inspection: 1290639.015 - Patterson-Uti Drilling Company, Llc**

**Inspection Information - Office: Oklahoma City**

 

**Inspection Nr**

**Report ID**

**Date Opened**

----

**Site Address**: 			   Patterson-Uti Drilling Company, Llc			   Section 17-7n-18eQuinton, OK 74561

**Mailing Address**: 			   10713 W. Sam Houston Parkway N., Houston, TX 77064

**Union Status**: NonUnion

**SIC**:

**NAICS**: 213111/Drilling Oil and Gas Wells

----

**Inspection Type**: Fat/Cat

**Scope**: Complete

**Advanced Notice**: N

**Ownership**: Private

**Safety/Health**: Health

**Close Conference**: 07/17/2018

**Emphasis**:L:Oilgas

**Case Closed**: 02/17/2022

----

**Case Status: CLOSED**

#### **Investigation Summary**

**Investigation Nr**

**Event**

At 8:37 a.m. on January 22, 2018,  five employees were working on an oil rig, tripping out the wellbore to change a bit. During work, the gas surfaced as the pipe/bit was removed from the well, causing the well to burp.  Once the initial burp subsided, another burp occurred and gas fumes found an ignition source, causing a series of explosions on and around the rig. Five employees were in the doghouse, unable to escape and were over come by smoke and excessive heat. Three employees were killed.

**Keywords:**explosion, explosion venting, gas well, heat, smoke, smoke inhalation
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