MEK4450 DNV 03 Drilling and Well Head. · PDF fileDNV-OS-F201 DNV-RP-F206 Control Systems ISO...

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August 2012

MEK4450

03 Drilling and Wellhead Systems

© Det Norske Veritas AS. All rights reserved.August 2012

Subsea Drilling and Wellhead Systems

This module will cover:

Applicable codes and standards

Reservoir Engineering

Subsea Wells

Subsea Well Program

Wellhead Equipment

Deepwater drilling

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Goals

Understand the premises and interfaces to the drilling activity

To understand the main building blocks in a well

To be able to participate in debates regarding drilling activity and well architecture

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Standards Overview

Wellhead/XT:API 6aAPI 17dISO 10423ISO 13628-4

BOPISO 13628-7NORSOK D-001NORSOK D-010API Spec 6AAPI Spec 16AAPI RP 16EAPI RP 53API 16dAPI Spec 16C

Casing Tubing, DownholeISO 11960API 5ct(2)(3)API 14a(b)(h)(j)ISO 10426-1 (cement)

Drilling Equip.API 7KAPI RP 64API 4FAPI 8CDNV-OS-E101

GeneralISO 13628-1NORSOK D-001NORSOK D-010NORSOK U-001OLF Guideline 070PSA NorwayDNV-OS-C101

Riser/UmbilicalsISO 13628-2ISO 13628-3ISO 13628-5ISO 13628-7API RP 16QAPI Spec 16R DNV-OSS-302DNV-OS-F201DNV-RP-F206

Control SystemsISO 13628-6API Spec 16D

Well FoundationAPI RP 2A

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Applicable codes and standards

Main codes for wellhead and drilling:

API 6A/ISO 10423 Specification for Wellhead and Christmas Tree Equipment

API 17D/ISO 13628-4 Subsea wellhead and tree equipment

API 16A / ISO 13533 Specification for Drill-through Equipment

+ ASME, ISO, BS +++

NORSOK D-010

NORSOK U-001

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Reservoir Engineering

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Ormen Lange Reservoir, 350 km2 2000 meter below seabed:

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Subsea WellsThe main development well types:

Exploration wells

Production wells (oil, gas)

Injection wells (water, gas)

Well design through the reservoir:

Vertical

Deviated

Horizontal

Multi branch (side-track)

Enhanced Recovery:

Water injection

Gas injection

WAG; water alternating gas injection

Artificial lift

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Subsea Well Program

Typical Subsea Well Program:

Drill 36” hole to ~80m

Run and cement 30” Conductor

Drill 26” hole to ~800m

Run and cement 20” casing with 18 3/4” (link) WH

Run Blow-out-preventer (BOP)

Drill 17 ½” hole to ~1300m

Run and cement 13 3/8” Casing

Drill 12 1/4” hole to ~1700m

Run and cement 9 5/8” Casing

Drill 8 ½” hole to ~2000m

Clean up well

Abandon well (run plug or close valve)

Proceed to completion operations

This program can be a 100 days plan

BOP

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Xmas Tree Systems

Typical Tree Installation Sequence:

Install Xmas Tree on Wellhead using drill string and Tree Running Tool (TRT)

Recover TRT

Run BOP and marine riser

Remove down hole plugs

Run completion / production tubing

Perforate tubing at reservoir depth

Inhibit well and prepare to abandon

Install internal tree cap

Retrieve marine riser and BOP

Drill rig moves to next well

Flowlines and flying leads installed by Rig or installation vessel

XTXT

BOP


UNSTABLEROGALANDSHALES

RESERVOIR

18-3/4" wellhead

36"/30" conductor at 940 mTVD

13-3/8 x 13-5/8" intermediate casing set in17 1/2" hole at 2100 - 2200m TVD.

7 " lower completion.

20" surface casing at 1600mTVD

36" conductor housing

18 3/4" X 7" X 2" tubing hanger

2 x 7" TRSSSV’s

18 3/4" X 13 3/8" casing hanger

9 5/8" liner in 12 1/4" hole to top reservoir at2705m TVD over sail section, to prevent shale

9-5/8 x 7" production packer.9-5/8 x 13-3/8" liner hanger.

9-5/8" production tubing, with production packer setbelow 9 5/8" liner lap.7" tail pipe available for deep set plugs anddownhole gauge positioning.

9-5/8" x 7" lower completion packer

9-5/8 x 7" full bore isolation valve

7" formation isolation valve

Well Completion - sample

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TVD vs. MD

TVD – True Measured Depth

MD – Measured Depth

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Wellhead Equipment

18 ¾” Wellhead Housing

30” Conductor Housing

9 5/8” Casing Hanger

18 ¾” Packoff

(Annulus seal assembly)


Drilling Guide Base

The wellhead system suspends the casing and serve as a barrier for well fluids against the environment.

There are 5 main suppliers of subsea Wellhead systems:

- GE Oil & Gas (ex. Vetco Gray)

- FMC

- Aker Solutions

- Drill-Quip

- Cameron

The wellheads are usually designed according to API 17D (ISO13628-4) and API 6A (ISO10423).

The 18 3/4 ” Wellhead Housing often has a H4 Vetco external profile for subsea wells.

The internal seal and locking profiles are supplier specific.

Main Components:

Casing Diagram

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Wellhead Equipment

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Deepwater Drilling

An increasing number of the subsea wells worldwide are located in deepwater. Deepwater is usually defined as water depths from 300 – 1500 m, with greater than 1500 m water depth classified as ultra deepwater. These depths impose significant challenges with respect to subsea drilling.

Existing drilling rigs allow for drilling in water depths in the order of 2400 m. New generation drill rigs and drill ships are being designed for water depths beyond 3000 m.

In deep water, drilling requires very heavy equipment, drilling operations and well control procedures are more difficult and well costs can rise dramatically.

The following new techniques are considered to have a significant impact on the subsea well construction costs:

• Under balanced drilling (The first contract in north sea awarded by Statoil)

• Riser less drilling or dual gradient drilling system

• Expandable casing strings

• Casing while drilling

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Mono Bore Drilling

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Buzz group

What are the main principles in order to get the oil and gas?

Please give details…- How do you get to the reservoir?

- How do you get the oil/gas out?

- Where does the oil/gas go from there?

- Think of some safety features in Drilling operations…

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Safeguarding life, property and the environment

www.dnv.com

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30” Conductor Housing

BACKBACK

Wellhead Locking Profile

Running Profile

Flow by Port

Guidebase Landing Shoulder

Conductor Extension

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18 3/4” Wellhead Housing

BACK

Lockdown ring

Vetco H4 Profile

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BACK

13 3/8” Casing Pup Joint

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BACK

Landing Shoulder

Fluted Centraliser

9 5/8” Casing Pup Joint

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18 3/4” Pack-off

BACKLocking Mandrel

Metal Seal

Wellhead Lock Ring

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Drilling Guide Base

BACK

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Casing Diagram

BACK

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Subsea BOP

BACK

Blowout.wmv

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MEK4450 DNV 03 Drilling and Well Head. · PDF fileDNV-OS-F201 DNV-RP-F206 Control Systems ISO...

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