Operations with Mud Cap Drilling (MPD, Managed Presure Drilling)

Operations with Mud Cap Drilling (MPD, Managed Presure Drilling)

Once properly commissioned and tested the Mud Cap Drilling system, drilling can be done the conventional mode until actual circulation losses conditions dictate to switch to Mud Cap Drilling mode. At…

Sidetracking Guidelines

Wells may require sidetracking in order to re-drill the well to a new target, sidetrack past a fish or sidetrack due to hole problems.

The main requirements in sidetracking a well is the development…

Sidetracking out of Casing with Whipstock

The ‘Window Master’ whipstock is a one trip system to mill afull size hole in casing in the required direction. The whipstock is mechanically set and requires a bridge plug to be set at a suitable…

Conversions factors

This article presents the main conversion factors for oil field and SI units.

Length/Depth/Distance (SI unit - m)

1 inch…

Depth Referencing

Depth Referencing

This article describes the various depth references used for drilling onshore and offshore wells: Reference Datum, Chart Datum (CD), Mean Sea Level (MSL), High Tide (HT), Low Tide (LT), Water Level…

Abandonment and sidetrack drilling programme

Abandonment and sidetrack drilling programme

1. Programme Summary

Abandonment

This programme will prepare the existing well for a forthcoming horizontal side-track which is due to begin immediately upon the successful completion of the…

Onshore Rig Move Plan - Table of Content

1. Rig move preparation

  • Location survey
  • Road Survey
  • Preparation of advanced loads
  • Administration (Rig move plan)
  • Equipment Inspection

2.   Preparation of new location and camp

3.  …

Swamp Barge (With Optional Submerged Caissons)

Swamp Barge (With Optional Submerged Caissons)

Swamp Barge (With Optional Submerged Caissons) is one of the drilling rig design concepts for offshore drilling in shallow water environments.

  • Swamp barges are a proven concept and can operate in…

Sequence of Operations - Typical Offshore Well

Operations

General Practices

1.  Conductors at jacket level

  Ensure cap…

Drillpipe and Bottom Hole Assembly - Standards

This article describes the standards for Drillpipe and Bottom Hole Assembly (BHA).

Pipe Tally Requirements

Master Drillpipe Tally Book

  • The master drill pipe tally book shall be kept by the Driller in…

Whipstock Milling Operation - Best Practices

Whipstock Milling Operation - Best Practices

  • Ensure that a drill pipe strainer is ALWAYS in the pipe when pumping fluids into the well
  • Ensure 4 x ditch magnets are in place for extracting milled cuttings.
  • Prepare sweeps prior to milling…

HPHT procedures

This article describes the keys elements for preparing a HPHT procedure

An offshore Daily Meeting will be held between Company Drilling Supervisor, and service companies to review programme, procedure…

Pre-Spud Meeting on Site

The Superintendent or Senior Operations Engineer shall conduct a pre-spud meeting on the rig with all relevant personnel directly or indirectly involved with the operations.

The appropriate Drilling…

Tripping Procedure in tight hole

The causes of tight holes include: Insufficient inhibition, Mud weight, Lubricity and Hole cleaning.

All these factors are important and comparisons should be made between wells with and without…

Rig Move Planning (Safety and Review)

General Safety Procedure for Rig Moves

Prior to moving the rig the Drilling Contractor shall address the following points:

  • Wearing personal protective equipment is a must when walking around on…

Shallow Draft Jack-Up

Shallow Draft Jack-Up

Shallow Draft Jack-Up  is one of the rig design concepts for offshore drilling in shallow water environments.

1. Water depth range: 5 – 100m. Shallow water capability from fully retracting spud…

Drill string vibrations

The existence of substantial vibrations in the drillstring have caused much trouble time during drilling in slim (and conventional) holes. Minimising drillstring vibrations during the drilling of slim…

Jacket Supported “Offshore’’ Rig

Jacket Supported “Offshore’’ Rig

Jacket Supported Offshore Rig is one of the rig design concepts for shallow water environments.

  • Steel Jacket can be tailored to water depth.
  • Rig design is independent of water depth.
  • Environment…

Offshore Rig Move Plan

1.    Rig move preparation

  • Administration (Rig move plan)
  • Equipment Inspection
  • Weather

2.   Preparation of new location

  • Hydrographic surveys
  • Diving/seabed surveys
  • Preparation of…

Final / End of Well Report

General information

Well and rig summary information plus the date that the well was spudded and abandoned / suspended / handed over to Production.

Well schematic showing final well status.

Time vs…

Land rig on barge (with optional submerged caissons)

Land rig on barge (with optional submerged caissons)

Land rig on barge (with optional submerged caissons) is one of the drilling rig design concepts for offshore shallow water depth environments.

  • Barges are a proven concept in shallow water and can…

Cantilever Drilling Barge

Cantilever Drilling Barge

Cantilever Drilling Barge  is one of the rig design concepts for shallow water environments.

  • Water depth range: 3 – 7m
  • Low environmental impact
  • Suitable for ice. This is a development of the…

Standard Jack-Up

Standard Jack-Up

Standard Jack-Up is one of the rig design concepts for offshore driling in shallow water environments.

 1. Water depth range 10 to 120 m for standard Jack-ups

Minimum draft for small jack-up is…

Submersible drilling rig

Submersible drilling rig

Submersible driling rig is one of the drilling rig design concepts for offshore shallow water environments.

 

1. Could operate in water depth of 3 to 30 m.

2. Environmental Impact Potentially…

Stand-by vessel duties, equipment and standards

This article describes the Stand-by vessel (SBV) and Fast Rescue Craft (FRC) duties, equipment and standards

1. Duties

The Master of the stand-by vessel shall ensure that:

  • Portable radio sets and…

Planning requirements for Managed Pressure Drilling (Mud Cap)

The Mud Cap Drilling (MPD, Managed Pressure Drilling) is a technique that can be used even in case of total circulation losses.

Circulation losses are traditionally cured with Loss Circulation…

Standard Drilling Tools

Some of the standard drilling tools commonly used in drilling are briefly described here, together with procedures for, and information on, their use. More detailed descriptions and specifications of…

Drilling Standards

This article describes the basic Drilling Standards.

The Drilling Department shall deliver a ‘fit for purpose’ wellbore, the criteria of which are:

  • attainment of the required bottom hole position
  • meet…

HPHT Drilling Procedures

The information contained in this document is provided as guidelines and should be used in conjunction with the kick procedures flowcharts to deal with specific well control problems.

These procedures…

General Guidelines for Sidetracking

The main requirement in sidetracking a well is the development of a lateral force to allow the bit to cut on the side of the hole.

BHA Geometry

The required lateral force shall be provided by the…

BHA Components and Inspections

This article describes the specifications and inspection requirements of the various BHA components for horizontal wells.

Inspections requirements

  • All BHA components should have received a full…

Site Preparation for Land Wells

Planning

On a monthly basis the Drilling Contractor shall be provided with a list of proposed new locations. This list is initiated by Drilling Manager and includes buffer locations to allow for…

8.5" Section Drilling Programme HPHT

1 Objective

Drill 8 1/2" hole to 15316 ft, run a lookahead VSP, drill 8 1/2" hole to ± 15581 ft (85 ft above the "x" marker, run logs and set the 7" liner .

2 General

1. The actual depth of the liner…

Rig Team HPHT Checklists

Rig Team HPHT Checklists

Checklists for the members of the rig team: OIM, Barge Master, Toolpusher, Driller, Assistant Driller, Derrick Man,  Cement Operator, Mud Engineer, Mud Logger.

Download HPHT Checklists - Word…

Steel Caisson and Drilling rig

Steel Caisson and Drilling rig

Drilling rig on a Steel Caisson is one of the drilling rig design concepts for offshore shallow water environments.

1. Water depth range: 5 – 100m however must be designed for a limited water depth…

Ingram Cactus: Exact 15 Universal Slim-hole wellhead system

The Ingram Cactus Exact 15 Universal Slim-hole Drilling and Completion System was specifically developed for use with slim-hole casing designs suitable for installation through small bore BOP stacks…

Drilling Rig on Pre-Installed Piles and Modules for shallow water depth

Drilling Rig on Pre-Installed Piles and Modules for shallow water depth

Drilling Rig on Pre-Installed Piles and Modules is one of the drilling rig design concepts for shallow water environments.

1. Water depth range: 0 – 3 m.

2. Low environment impact

3. Particularly…

Loadout list for drilling operations

This article presents examples of loadout/ equipment list for the following hole section: 36", 26", 17.5", 12.25", 8.5" and 6"

Posted Barge With Land or Modular Drilling Rig

Posted Barge With Land or Modular Drilling Rig

Posted Barge With Land Or Modular Rig is one of the rig design concepts for shallow water environments.

1. Could operate in water depth of 1 to 10 m.

2. Environmental Impact Potentially low.

3.…

Semi-Submersible

Semi-Submersible

Semi-Submersible is one of the drilling rig design concepts for offshore shallow water environments.

1. Water depth range: 30 – 1000m

2. Environmental Impact low

3. Not suitable for ice

4. Suitable…

Heli-Rig

Heli-Rig

Heli-Rig is one of the rig design concepts for shallow water environments.

 

1. Independent of water depth. Requires a support structure which in itself would not be helicopter transportable,…

Types of vessel, offshore support

Types of vessels, offshore operations, supply vessel, stand-by vessel, AST vessel

- Specifications may vary from above, and capacities are approximate only.

- Fuel consumption figures are given as a…

Land rig on artificial island (shallow water)

Land rig on artificial island (shallow water)

Land rig on artificial island is one of the drilling rig concepts for offshore drilling in shallow water environments.


1. Water depth range:  0-10m.  Costs rise significantly with water…

Drilling Programme - Preparation and Content

Responsibilities for preparation, approval and content of the drilling programme.

Drilling Programmes are the approved instructions for carrying out activities and tasks which are required to achieve…

Problems encountered in drilling extended reach and horizontal wells

The following table lists those problems commonly encountered in drilling extended reach (ERD) and horizontal wells and recommendd precautions.

Inefficient Hole Cleaning & Reduced Borehole…

Mechanisms of rock cutting

Bits and coreheads cut rock by crushing, shearing, grinding or jetting. Crushing bits are the well known roller cone bits and hammer bits.

1 Crushing bits - roller cone rock bits

Crushing bits work by…

Modularised and Pile Elevated Drilling Rig

Modularised and Pile Elevated Drilling Rig

Modularised and Pile Elevated Drilling Rig  is one of the drilling rig design concepts for shallow water environments.

1. Water depth range: 2 – 10m

2. Low environment impact. Installation and…

Diving operations in exploration drilling

Every offshore drilling operation must include some possibility of underwater intervention. This may be required for a variety of routine tasks including re-entry, guide-wire or riser connection,…

Offshore Rig Moves

This article describes the various issues to be considered for planning an offshore rig move.

1. Well/Jacket Status

Well Plugging Prior to Rig Move

  • If the current well path is less than 100 ft from…

Responsibilities during offshore rig moves

Rig moves should be carried out by two Marine Personnel. Deviations from this rule can only be authorised by the Marine Manager. The Marine Manager, or his nominated deputy, shall supervise the actual…

Site Restoration

After completion of the drilling operation by the drilling rig, the well is suspended.

The following possibilities exist:

  • The well will be re-entered within a short period by the work over rig to…

Offshore Rig Moves Planning and Preparation

Navigational Planning

The Marine Officer should plan the courses between locations, and routes to be taken through fields with due regard for jackets and barges or other vessels which may be moored in…

Guidelines for Site Survey/ Hazard Requirements for Drilling Units

For an area where no previous knowledge of jack-up penetration / sub-bottom information is available the location must be cored, this may be done by a coring vessel prior to rig arrival or from the…

Lost Circulation

Lost Circulation is not always a major problem; however, the procedure below should be followed when losses do occur:

1. Check surface equipment for leaks. If this fails to show any signs of leakage,…

Multilateral drilling programme

1. introduction

The purpose of this outline program is to set the framework for the operations.

This programme will prepare the existing well, for a forthcoming near horizontal multilateral side-track…

Sequence of Operations - Typical Onshore Well

This article describes the sequence of operations and the general practices for a typical onshore well.

Operations

General Practices

1.  Prepare access road and well lease

Minimise…

Drilling Unconsolidated Formations

The following techniques should be used while drilling Unconsolidated Formations:

1. Obtain maximum annular velocities by using critical velocity circulating rates.

2. Use a "Clayball Trap" or a small…

Abandonment guidelines

The objective of abandonment is to prevent the migration of all formation fluids, but especially hydrocarbons, between formations and to the surface. There are two types of conduit which must be…

Rig Move Dailly Report (Onshore and Ofshore)

The following information should be included in the daily rig move report to be submitted to Superintendent.

Onshore Rig Move

  • Date
  • Old location
  • New location
  • Total loads
  • Loads moves
  • % Rigged up
  • %…

Acronyms and Abbeviations

This article presents the main acronyms/ abbreviations used in the oil industry

A

AH                  Along hole

API                 …

Pre-Spud Drilling Equipment Suface and downhole Inspections

Prior to commencement of each well the Drilling Supervisor with the assistance of the Drilling Contractor Toolpusher shall perform a full rig inspection and record the results on the Company Drilling…

Surveys required before rig move - Offshore

Hydrographic Surveys

When  moving into a new location the following  hydrographic surveys are required:

  • seismic
  • sidescan sonar
  • water depth
  • soil analysis.

These surveys are by arranged by…

Mechanical power to the bit / corehead

This article describes  the various ways of transmitting mechanical power to the bit by rotation. There must be sufficient HHP at the bit to keep the cutters or diamonds clean, and that an…

Pre-spud Documentation Requirements

The documentation listed below must be available at the rig site prior to commencing the operations:

  • Concurrent Drilling Completions and Production Operations (if applicable)
  • Emergency Response…

Minimum safety stock for HPHT operations

Drilling fluid volumes (active, reserve and kill mud)

The minimum safety stock of mud available on surface prior to and whilst drilling any potential high pressure formation will be:

  • Active…

Cooper Oil Tools: MC2 compact wellhead

Main features of the MC2 compact wellhead are described below:

  • Flow through casing hanger with 45 degree shoulders and centralisation feature.
  • "Fastlock" hub and metal/metal "CX" gasket on wellhead…

Underreaming

Underreaming procedures vary from tool to tool. However, it shall be verified that:

  • the tool is function tested with the mud pumps on surface before running in
  • the cutters are secured inside the tool…

Responsibiliites for Rig Move, Site Preparation and Site restoration

Responsibilities for the implementation, supervision, verification and control of rig moves and site work are listed in the following table:

Action

Execution

Quality Control

Ensure…

Onshore Rig Moves - Well Status

This article describe the well status requirements for Onshore Rig Moves.

1. Well Status Prior to Rig Move from Old Location

The following barriers shall be in place in a development well:

  • annuli…

Rig Move Inspection Requirements (Onshore Operations)

Drilling Contractor Inspection Requirements

Prior to and during any rig equipment movement, the Drilling Contractor shall make inspections and checks on crane and support equipment condition eg.,…