1. NASEM Subsea Bolt Performance Workshop April 10 - 11, 2017
A Deepwater Drilling Contractors perspective
Pete Bennett
Director - Subsea Support
Pacific Drilling

2. Current BOP stacks in Pacific Fleet
BOPs were delivered through shipyard contracts & directly through the OEM
All BOP stacks were built from individual components at the OEM facility
All components were designed, built & tested according to the applicable API standards at time of manufacture
Complete Ton BOP stacks are fully assembled and tested at the manufacturers facility
Many ship in 2 pieces (LMRP & Lower Stack) to the yard where they are lifted onto the drilling rig.
Some are stacked up and built on the drilling rig

3. Current position
4 of our 7 vessel fleet have 2 BOP stacks – 11 stacks in service
We have not experienced any critical bolting failures
We changed out all riser connector & wellhead connector bolting after reported failures
Industry changed out 10,000 bolts as a result of lack of traceability on these critical fasteners
In some cases, wells were suspended & BOPs pulled to exchange these bolts

4. Moving forward
Identified all critical fasteners

5. Moving forward Identified all critical fasteners Equipment TerminationPN
MM#
Description
Quantity Required
Mud boost valve
Riser adaptor to mud boost valve
012100
68102
STUD,TE,1-1/8"x5-1/2"LG, A193B7, STD, CAD PLTD +NN 8
020343
41492
NUT, HX, HVY, 1-1/8"-8UN, A194Gr2H, CAD PLTD
Mud boost valve to kick out
41482
STUD,W/2 NUTS, UN X 8.50",A193 B7 W/2H NUTS
N/A -
Included with Stud
Mud boost valve to actuator
717532
19225
BOLT, BNT, 3-15/4-15M, T-B/DB VLV, 1-3/4"X5.50LG
Mud boost valve to balance stem
Mud boost valve to fluid cushion.
011011
110478
STUD, TE, 1-1/8'X5-3/4"LG, A193 B7, STD, ZINC PLATED
020003
19220
NUT, HX, HVY, 1-1/8"-8UN, A194Gr2H, ZINC PLTD
Mud boost valve auxiliary inlet
Dual Block Valve 6 off
Valve to actuator
717827
92032
SCREW, HHC, 1-3/4"X 5-1/2"LG, A320GrL43 96
Valve to balance stem
Isolation Valves 2 off 16
Riser adaptor
Riser adaptor to flex joint
STUD,AT,2-1/4”-8UN X 27” LG, A320 GRL7,CAD PLT'D 24
NUT, HX, HVY, 2-1/4"-8UN-2B, A320GRL7,CAD PLT 52
Upper Annular
Flex joint to upper annular
012231
70655
STUD, TE, 2-1/4"8UNx14-1/4"LG A320GrL7, LT, STD
020016
19040
NUT, HX, HVY, 2-1/4"-8UN, A194Gr2H, ZINC PLTD
Side outlet
012653
70419
STUD, TE, 1-1/8"-8UNx5-1/4"LG, A320GrL7
Lower Annular
Upper Annular Lower annular
Riser Connector
Lower annular to riser connector H
91718
STUD W/ONE NUT, TAP END,PER VGS2.4.13, UNR-2A X UNR-2A, LG, STUD MATERIAL PER ASTM A320 GRL43, NUT MATERIAL PER ASTM A194 GR 7, COATING PER VGS , ASTM B633
20each/1kit
Upper housing to lower housing H
SCREW,CAP,HEX COLLAR, X LG,UNR-2A, LOW TEMPERATURE SERVICE, PURCHASE PER VGS AND DRAWING H10004 DIMENSIONS: A = 2.000/1.980; B = 9.000/8.760; C = UNR-2A(ROUNDED ROOT); D = 6.00 E = 2.005/1.975; F = .895/ .865; G = .090/ .075; H = 2.005/1.990; J = 2.268; K = 2.995/2.970 WEIGHT: 11 LBS F1: COAT PER VGS
32 each/1 Kit
Flex Loops 2 off
Upper Flex Loop
050861
70481
CLAMP ASSY, #6, 4-BOLT THRU, TEFLON COATED STUDS & 2
Lower Flex loop

6. Moving forward Identified all critical fasteners
Worked though all Material Data books to identify actual hardness where testing had taken place & manufacturers specifications to identify higher risk (greater than 35 HRC fasteners)
Agreed with adoption of API 20E for all purchases of subsea bolting and changed procurement system accordingly to always specify API 20E and BSL level on all future purchases
Reviewed every work instruction and amended to specify tighter control on torque process, including sign off witness, calibration checks on equipment, minimum 3 pass method and retorque after maximum working pressure test.
Signed up to the API quarterly BSEE update and provide all requested information on our fleet status in transition to API 20 E bolting
Founding member of Group of seven contractors which created the Failure reporting database now under IADC stewardship with OEM, operator & contractors as members

7. Moving forward Sourced practical inspection technique
Worked with OEM to obtain non –intrusive bolt integrity verification technique
Decided to use PAUT - Phased Array Ultrasound Testing

8. Phased Array Inspection
PAUT will not determine hardness but will show existing flaws
All thoughbore bolts on 3 BOP stacks have been inspected
No flaws or failed bolts

9. Closing
Continue to support Industry & BSEE initiatives to improve reliability
We fully support all efforts to improve on quality.
We recognize that the vast majority of incidents are due to a failing to follow process, and that consequences grow without adequate traceability
We continue to follow OEM recommendations and alerts
We work closely with our peers, clients, manufacturers and maintain transparent relationships
We commit to promptly & accurately reporting all failures to the database
We will only install replacement bolting that meets API 20E specifications

10. Contact Pacific Drilling Pete Bennett Director – Subsea Support
11,700 Katy Fwy, Suite 175
Houston, Texas
USA
Phone:

11. Thank you!