Well planning

WELCOME TO THE STUDENTS
7th Semester (Mining)
Bogura Polytechnic Institute, Bogura.
Md. Majedur Rahman
B. Sc (Hon’s), M. Sc in Geology & Mining, RU
Instructor (Tech)
Mining and Mine Survey Technology
Bogura Polytechnic Institute, BOGURA.
Presented By
Prepared by Md. Majedur Rahman, E-mail: majedu1r_ru6871@yahoo.comMay 29, 2020 1

Petroleum Well Design & Completion
Course Code No. 69372
Prepared by Md. Majedur Rahman, E-mail:
majedu1r_ru6871@yahoo.com
May 29, 2020 2

Chapter-02
Understand the well planning
2.1 Define well planning.
2.2 Describe well planning objectives.
2.3 Classify hydrocarbon well types.
2.4 Define formation pressure.
2.5 Preparation of well drilling program.
2.6 Overview of the planning process.
2.7 Enumerate planning cost.
May 29, 2020 3

• Well Planning involves the preparation of good drilling
programmes for safe and effective oil well drilling, testing and
completion.
• The well planner must collate all available data and technology
and apply same to meet the well objectives as cheaply,
efficiently and safely as possible
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2.1 Define well planning.

Well Planning
• The most demanding aspect of drilling engineering
• Requires the integration of engineering principles, corporate or
personal philosophy, and experience factors
• Vary within drilling industry
• Skilled well planners have three common traits
• Experienced drilling personnel
• Utilize available engineering tools
• Research and review every aspect of the plan to isolate and remove
potential problems areas
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Well Planning Process
Well Planning can be broken down into:
• Definition of Well Objectives
• Obtaining Consent to drill from Authorities
• Collection and Scrutiny of Data
• Estimation of Formation Pressure Regimes
• Estimation of Formation Fracture Gradients
• Drilling Programme Preparation
• Rig Specification
• Authorization for Expenditure (AFE) Preparation
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• Wells can be exploratory, appraisal or development
• Planning of the first two groups is initiated by the exploration
departments which will also define objectives
• Planning of development wells is usually initiated by the
production departments which will also define objectives
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2.2 Describe well planning objectives.

2.3 Classify hydrocarbon well types.
Classifications of the wells are as following:
• Wildcats
• Exploratory
• Step-out
• Infill’s
• Reentries
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Well Type Characteristics
Well Type Characteristics
Wildcat Not known (or little) geological foundation for site selection
Exploratory Site selection based on seismic data, satellite survey, etc.
No known drilling data in the area
Step-out Delineates the reservoir’s boundary
Drilled after the exploratory discovery(s)
Based on seismic data
Infill Drills the known productive portions of the reservoir
Site selection based on patterns, drainage radius, etc.
Reentry Existing well reentered to deepen, sidetrack, rework, or recomplete
Various amounts of planning required, depending on
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2.4 Define formation pressure.
The force exerted by fluids in a formation, recorded in the hole at the
level of the formation with shut in. It is also called reservoir pressure or
shut-in bottom hole pressure.
Formation pressure is the pressure of fluid contained in pore space of
rock and there are 3 categories of the formation pressure which are
normal pressure, abnormal pressure and subnormal pressure.
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• 1. Normal Pressure: Normal pressure is the hydrostatic of water
column from the surface to the subsurface formation
• 2. Abnormal Pressure: The abnormal pressure is the pressure greater
than the pressure column of water (normal pressure). Generally, the
abnormal pressure zones are good reservoir which oil companies are
looking for. This kind of pressure can create well control problem.
• 3. Subnormal Pressure: The subnormal pressure is the pressure that
is less than normal pressure and it possibly causes lost circulation
problems.
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2.5 Preparation of well drilling program.
Drilling Programmes can be broken into 14 main sections:
• Well Details
• Well Objectives
• Casing Design
• Wellhead Selection
• BOP Requirements
• Cementing Programme
• Deviation Programme
• Survey Requirements
• Mud Programme
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• Bits and Hydraulics Programme
• Evaluation Requirements
• Operational Procedure and Time-Depth Graph Construction
• Site Plan
• Reporting Requirements and Contact Numbers
All drilling programmes will contain the above information in some
form.
Specialized wells could also contain other relevant data.
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2.6 Overview of the planning process.
Well Planning can be broken down into:
• Definition of Well Objectives
• Obtaining Consent to drill from Authorities
• Collection and Scrutiny of Data
• Estimation of Formation Pressure Regimes
• Estimation of Formation Fracture Gradients
• Drilling Programme Preparation
• Rig Specification
• Authorization for Expenditure (AFE) Preparation
May 29, 2020
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The planning phases involved in drilling an oil or gas well typically involve
estimating the value of sought reserves, estimating the costs to access reserves,
acquiring property by a mineral lease, a geological survey, a well bore plan, and a
layout of the type of equipment required to reach the depth of the well. Drilling
engineers are in charge of the process of planning and drilling the wells. Their
responsibilities include:
• Designing well programs (e.g., casing sizes and setting depths) to prevent
blowouts (uncontrolled well-fluid release) while allowing adequate formation
evaluation.
• Designing or contributing to the design of casing strings and cementing plans,
directional drilling plans, drilling fluids programs, and drill string and drill bit
programs.
• Specifying equipment, material and ratings and grades to be used in the drilling
process.
• Providing technical support and audit during the drilling process.
• Performing cost estimates and analysis.
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2.7 Enumerate planning cost.
The purpose of the cost plan is to allocate the budget to the main elements
of the project to provide a basis for cost control. The terms budget and cost
plan are often regarded as synonymous. Price is the value that is put to a
product or service and is the result of a complex set of calculations, research
and understanding and risk taking ability.
The client's project cost plan is monitored by the client's finance officer and
is calculated by adding items such as:
• Inflation.
• Professional fees.
• VAT.
• Client contingency.
• Statutory fees.
• Exclusions.
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Any Questions
May 29, 2020 17

THANKS TO ALL
May 29, 2020 18

Well planning

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