INTERNATIONAL PHASE OF OCEAN DRILLING (IPOD)DEEP SEA DRILLING PROJECTDEVELOPMENT ENGINEERINGTECHNICAL NOTE NO. 2

RLE COPY

DRILL-IN-CASINGSYSTEM

SCRIPPS INSTITUTION OF OCEANOGRAPHYUNIVERSITY OF CALIFORNIA AT SAN DIEGOCONTRACT NSF C-482PRIME CONTRACTOR: THE REGENTS, UNIVERSITY OF CALIFORNIA

DISCLAIMER

This report was prepared by the Deep Sea Drilling Project, University of

California, San Diego, as an account of work sponsored by the United States

Government's National Science Foundation. Neither the University nor any

of their employees, nor any of their contractors, subcontractors, or their

employees, makes any warranty, express or implied, or assumes any legal

liability or responsibility for the accuracy, completeness or usefulness

of any information, apparatus, product or process disclosed, or represents

that its use would not infringe privately owned rights.

π

TECHNICAL NOTE NO. 2

DRILL-IN-CASING SYSTEM

Prepared for theNATIONAL SCIENCE FOUNDATION

National Ocean Sediment Coring ProgramUnder Contract C-482

by the

UNIVERSITY OF CALIFORNIAScripps Institution of OceanographyPrime Contractor for the Project

June 1984

W. A. Nierenberg, Director M. N. A. PetersonScripps Institution of Oceanography Principal Investigator and

Project ManagerDeep Sea Drilling ProjectScripps Institution of Oceanography

INTRODUCTION

The "Drill-In Casing" system has been deployed only once--on Leg 78A,Hole 542B and was a qualified success. A 57 m string of 11-3/4" casingwas drilled in to put the shoe (bit) at the desired depth of 323.5 m BSFwith the coring extending through a fault zone which was to be isolated.The release mechanism failed to operate, however, and it was eventuallynecessary to sever the drill string above the BHA. Some weaknesses wereidentified in the system and will need further consideration before asecond deployment is attempted.

INDEX

I. DRILL-IN-CASING SYSTEM SEA TRIALSREPORT - LEG 78A

II. OPERATIONAL SEQUENCE SKETCHES

III. DESCRIPTIVE SKETCHES

A. SECTION A-A DRIVE ASSEMBLY

B. HANGER LOWERING SUB ARRANGEMENT

IV. PARTS LIST & MACHINE DRAWINGS

vii

DRILL-IN-CASING SYSTEMSEA TRIALS REPORT

LEG 78A

The "Drill-In Casing" system has been deployed only once—on Leg 78A,Hole 542B and was a qualified success. A 57 m string of 11-3/4" casingwas drilled in to put the shoe (bit) at the desired depth of 323.5 m BSFwith the coring extending through a fault zone which was to be isolated.The release mechanism failed to operate, however, and it was eventuallynecessary to sever the drill string above the BHA. The following weak-nesses were identified and will need further consideration before a seconddeployment is attempted:

A) Release Mechanism - The failure of the release operation apparentlyresulted from the inability to move the release sleeve to the fullyshifted position. This is evidenced by the failure of the shiftingtool to disengage downhole. Two of the dog hinge pins sheared andthe tool was recovered on the first attempt, but the overshot pinsheared on the subsequent two attempts, leaving the shifting toolin place.

Since no failed components were recovered, primary failure analysiscannot be performed. A design review and further testing of therelease mechanism are needed. It would seem possible that thevertical and torsional loading attendant to the 11-hour drillingoperation may have caused distortion or failure of components of thedrive/lowering system which, in turn, prevented proper actuation ofthe release mechanism.

B) Torque Transmission - Exceptionally high and irregular drill stringtorque was recorded throughout the drilling operation. This wasattributed at the time to a "torsional spring" effect in the casingstring. Since the casing bit is driven from the top of the casing,it was felt that energy was alternately stored and released by thecasing, causing the drill string to "torque up" and then spin free.A spline or similar arrangement was proposed to key the casing andBHA together torsionally near the bit. The effect may have beensimply the result of the high torque produced by 17-1/2" bit arrange-ment acting through the long drill string, however. The "spring"properties of the casing string should be analyzed to determine ifthis is a problem.

NOTE that rotating friction against the wall of the holewill tend to loosen and "back off" the casing collarconnections if the casing is driven from the bottom.

A related problem was the requirement to rotate the string at about60 rpm due to the low torque output at slow speeds of the GLOMARCHALLENGER power sub.

C) Locking BHA Connections - A tendency for rotary-shoulderedconnections below the lowering sub to loosen and back off wasforeseen due to vibration and irregular torque. To avoid usingepoxy glue on the connections or tack welding the 4140 drillcollars, a locking sleeve system was provided. The sleeves couldnot be installed on Leg 78A because their diameter was too small,and steel straps were tack welded across the drill collar connections.Observers agreed that the locking sleeve concept was unsatisfactorybecause it was felt that: (1) predrilling recesses in the drillcollars was too time-consuming and difficult, (2) sleeves wouldnever fit properly due to differences in collar diameter from wearand fabrication specifications and (3) the device would not bestrong enough to resist torque sufficient to "break" a shoulderedconnection.

All indications are that the Drill-In Casing system would have been completelysuccessful at Site 542, both in deployment and in isolating the unstable zonefor further drilling, had the release failure not occurred. The high torqueand low rate of penetration in the soft sediments penetrated leave seriousdoubts as to the feasibility of penetrating ingenous or even induratedsedimentary rock with the system.

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INDEX - OPERATIONS - DEEP SEA DRILLING PROJECT

ITEM

OJ 4800

OJ 4801

O.I 4802

OJ 4803

OJ 4804

OJ 4805

OJ 4806

OJ 4807

OJ 4808

OJ 4809

OJ 4810

OJ 4811

OJ 4812

OJ 4813

OJ 4814

OJ 4815

OJ 4816

OJ 4817

OJ 4818

OJ 4819

OJ 4820

OJ 4821

OJ 4822

OJ 4823

DESCRIPTIONDRILL-IN CASING

Drive and Lower Assembly

17*f O.D. Casing Drive

Drive Bushing

Combination Lowering & Drive Sub

Drive Adapter

Lower Dog Segment

Sleeve

Upper Dog-Drive Bushing

Pin-Lower Dog Segment

Spring - Lower Dog Segment

Lock Screw - Drive Bushing

Polypak Seal 14Ji O.D.

Polypak Seal 8% I.D.

Retaining Ring

Snap Ring

Junk Ring

Spring - Upper Dog

X-Over Sub

O-Ring 5 I.D. x 5*1 O.D. x k W (-429)

Release Screws-Snap Ring

h" NPT Soc. HD. Cap Screws

17% Casing Bit Assembly

17% Casing Bit Body

17*5 Casing Bit Guide

DRUG. MO.

D-OJ4800-1

D-OJ4801-2

D-OJ4802-1

D-OJ4803-1

C-OJ4804

C-OJ4805-1

C-OJ4806-1

C-OJ4807

A-OJ4808

A-0J4809

A-OJ4810-1

A-OJ4811-1

A-OJ4812-1

A-OJ4813

B-OJ4814-1

A-OJ4815-1

A-OJ4816-1

D-OJ4817

A-OJ1818

A-OJ4819-1

D-OJ4821-1

D-OJ4822-2

D-OJ4823-2

nDATC August 15, 1983 PAGE OF

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SUGGESTED VENDOR AND PART NO.

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QUANTITY:

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MATERIAL:

Urethane

SUGGESTED VENDOR & PART NO:

Parker Seal Company

#5001-3250-750B

QUANTITY:

One Required

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SIZE:

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Part No. öJ48>\Z- \DRAWINO NUMBER

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SIZE:

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Cadmium plate

SUGGESTED VENDOR & PART NO.

Waides Truarc IN-5000-81

QUANTITY:

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wnmrra ON NO. IOOOH CLMABPRINT

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Scraper Ring

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Copper Alloy

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MS-28776M2-49

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Compression Spring

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S o l i d Ht: .820 inches

MATERIAL:

Music Wire, ASTM 228

Stainless Steel

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LEE I LC-105L-3

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O-Ring

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MATERIAL:

70 Durometer

N i t r i l e Rubber (BUNA N)

SPECIFICATION:

ARP-568-429

QUANTITY:

Two Required

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