1 2 well planning programming

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Well Planning Overview

© COPYRIGHT 2001, NExT. All Rights Reserved


Well Planning Overview
• Contents;
– Session Objectives,
– Introduction,
– Well Planning Requirements,
– Classification of Well Types,
– Data Gathering,
– Well Plan Format.

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Well Planning Overview
• Session Objectives;
– By the end of this session, you should be able to:
• State the basic requirements for well planning,
• List main well types,
• List information included in a well plan and identify sources,
• Describe format of a well plan generally available prior to
drilling.

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Well Planning Overview
• Introduction;
– Well Planning is one of the most demanding areas of
Drilling Engineering,
– It requires the integration of various engineering
disciplines, corporate polices and personal experience,
– The process may vary within drilling industry, but the
final aim is to drill a well safely that satisfies the
objectives set out in the well proposal,
– Well Proposal is usually issued by Petroleum Engineers
and describes well objectives.

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Well Planning Overview
• Well Planning Requirements;
– Main requirement for well planning is to ensure that a

program is put together for drilling a well that has, at least,
the following characteristics:
• The well can be drilled safely,
• The well can be used to satisfy the well objectives,
• The well is drilled at minimum cost,

– It is not always possible to accomplish these factors due to:
• Known factors (equipment limitation, casing availability etc),
• Unknown factors (geology, pressure).

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Well Planning Overview
• Well Planning Guidelines - Safety ;
– Sufficient Hydrostatic Head with fluid in hole - correct
density!
– Blow Out Prevention Equipment in good condition
– Casing designed to contain max anticipated pressure
– No kicks or swabbing
• Danger to human life and environment
• Damage to pay zone during kill operations

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Well Planning Overview
• Normal Operations vs. Kick

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Well Planning Overview
• Consequences of kicks !

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Well Planning Overview
• Well Planning Guidelines - Production & Cost;
– Completion starts with the first turn of the Bit!
(36”, 26”, 17 1/2”, 16”, 12 1/4”, 8 1/2”, 6”, 3 3/4”)

– Bigger diameter hole does not mean larger production,

– Need to balance contingency vs. cost,
– Well cemented production casing - no remedial work,
– Usable inside diameter - just big enough for ;
• Logging,
• Completion String / Test string,

– Completion string -tubing size vs. pressure, special
equipment (SSV, packer, dual string etc.).
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Well Planning Overview
• Classifications of Well Types;
– Purpose :
• Exploration (Wild Cat): These are wells drilled in an area
that has not been explored before. (No offset data, very
little geological and pressure data available).
• Appraisal: These wells are drilled to determine how large
the reservoir is. (Some offset data always available).
• Development: These wells are drilled to enter a known
productive portion of the reservoir. (Good offset data
available),
– Production, Injection or Observation

– Profile :
• Vertical, Deviated, Horizontal or Multilateral

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Well Planning Overview
• Data Gathering for Well Plan;
– The following set of information needs to be gathered for
well planning and are generally taken from offset wells;
• Bit records,
• Casing shoe depth,
• Electric and mud logs,
• Drillstem tests,
• Mud recaps,
• Drilling times,
• Hole problems,
• Bottom hole target.
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Well Planning Overview
• Well Plan Format;

– Introduction:
• Well name,
• Location,
• Anticipated spud date etc.

– Program:
• Contains program information on formation and casing
depths, cement, floating equipment, wellhead, mud, bits,
hydraulics, logging and step by step drilling procedure.

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Well Planning Overview
• Well Plan Format;
– Detailed Design Data:
• Consists of the engineering calculations that built into the
program. (Casing & Hydraulic designs).

– Testing Procedures:
• Outline BOP testing, kick control and evacuation
procedures (offshore).

– Vendor Recommendations:
• Service company recommendations, drilling rig contracts

with inventory.
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Well Planning Overview
• Well Plan Format - Additional;
– Offset Well Data,
– Permits, Plots, Government Regulation, Safety:
• Copies of all required permits and accompanying plots are
excellent items to include in well planning.

– Prespud Meeting info,
– Well History File:
• The final act of well planning and performed after the well
has been drilled (DEE process),
• Compares AFE with actual on item by item basis,
• This will help for future planning.
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Well Planning Overview
• In Summary;
Data Collection

Fracture Pressure Analysis

Pore Pressure Analysis

Pipe Seating Depth Selection
Completion Planning
Bit program

Hole Geometry Selection

Mud Plan

Casing Design

Drillstring Design

Cement Plan
TBG Design

Rig Sizing & Selection

Drilltime Projections
Cost Estimation
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Well Planning Overview
• Now YOU should be able to;
– State the basic goals of well planning in terms of safety,
cost and product quality,

– List main well types and describe basic information
included in a well plan,
– Identify sources for each type of information,
– Describe a format of a well plan generally available prior
to drilling.

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Network of Excellence in Training

Well Planning Overview
End of Lecture

© COPYRIGHT 2001, NExT. All Rights Reserved