This report presents the development plan for Gazelle gas condensate reservoir.
The viable development option for the field and the main items of equipment selected for the chosen option were presented.
The field development option was selected after analysing two different options:
1. Use of FPSO with shuttle tanker and
2. Steel Piled Jacket with pipelines based on technical viability, cost and commerciality aspect.
Based on these and some assumptions made, the development of the field using Steel Piled Jacket and pipeline for gas and condensate export was selected.
With this option, transportation of condensate to Fort Thompson is done via pipeline and export of gas to Fort Thompson, Gazelle and other fields is also achieved via pipelines.
The major components of the facility development project will include Piled jacket, drilling module, the fluid processing equipment such as separators, glycol dehydration units, gas turbines, centrifugal pumps and compressors, orifice and turbine meters.
Table of Contents
1.1 Rotary drilling
1.1.1 Hoisting system
1.1.2 Circulating system
1.1.3 Rotating system
1.2 Process of rotary drilling
1.3 Criterion for land rig selection
2.1 Well planning
2.1.1 Well kick
2.1.2 Lost circulation
2.1.3 Selecting of casing setting depths
3.1 Pore pressure gradient
4.1 Cement additives and cementing
4.1.1 Lightweight additives
4.1.2 Retarders
4.1.3 Accelerators
4.1.4 Heavyweight additives
4.2 Cementing calculations
5.1 Selection of casing setting depths
5.1.1 Bottom-top design
5.1.2 Top-bottom design
6.1 Bottom Hole Assembly (BHA)
6.1.1 Drill bit
6.1.2 Mud motor
6.1.3 Measurement while drilling (MWD)
6.1.4 Logging while drilling (LWD)
6.1.5 Non-magnetic drill collar (NMDC)
6.1.6 Drilling jars
6.1.7 Drill collars
6.1.8 Stabilizers
6.1.9 Subs
6.2 Drill collars calculation
7.0 Well completion
7.1 Objective of bottom top design
8.0 Well schematic
Objectives and Topics
This report focuses on developing a comprehensive field development programme for the Holly field, specifically targeting an exploratory well at a true vertical depth of 12,000 ft. It provides the necessary engineering support for optimal drilling operations by analyzing drilling systems, pressure management, and well completion design.
- Rotary drilling systems and rig selection criteria
- Pore pressure gradient evaluation and well planning
- Cementing additive applications and related calculations
- Methods for determining optimal casing setting depths
- Bottom Hole Assembly (BHA) component configuration and design
- Well completion architecture and production strategies
Excerpt from the Book
1.1 Rotary drilling
Rotary drilling is any form of drilling which involves a rotary action combined with downward force to grind away the cuttings in which a hole is being formed (Azar and Robello, 2007). The three systems on a rotary drilling are the:
• Hoisting system
• Circulating system
• Rotating system
1.1.1 Hoisting system
The hoisting system on a rotary rig consist of tools used to support a means to lower and raise the principal items of equipment such as drill strings, casing strings and other necessary subsurface equipment in and out of the well. The drilling operation involves withdrawing the drill string from the well, to change a dull drill bit and to add additional drill pipe to the drill string as the hole deepens. The major components are the draw works, block and tackle, derrick and substructure.
Summary of Chapters
1.1 Rotary drilling: Defines rotary drilling and outlines its three core systems: hoisting, circulating, and rotating.
1.2 Process of rotary drilling: Describes the fundamental mechanisms required for drilling, including downward force, bit rotation, and fluid circulation.
1.3 Criterion for land rig selection: Discusses factors involved in selecting an appropriate land rig based on trajectory, lithology, and pressure.
2.1 Well planning: Explains the necessity of evaluating pore and fracture pressures to avoid well kicks, lost circulation, and other operational risks.
3.1 Pore pressure gradient: Provides data and visual representation of how pore pressure changes with well depth.
4.1 Cement additives and cementing: Details the use and functions of various additives in Portland cement for casing operations.
4.2 Cementing calculations: Performs the specific mathematical calculations for slurry volume, mud displacement, and differential pressure.
5.1 Selection of casing setting depths: Compares bottom-top and top-bottom design methodologies for setting casing strings.
6.1 Bottom Hole Assembly (BHA): Lists and defines the components that make up the lower end of the drill string.
6.2 Drill collars calculation: Calculates the required number of drill collars to achieve the targeted weight on bit.
7.0 Well completion: Analyzes the mechanical configuration required for hydrocarbon production from the formation to the surface.
8.0 Well schematic: Illustrates the final design and casing configuration of the well.
Keywords
Rotary drilling, Hoisting system, Well planning, Pore pressure, Fracture pressure, Cementing, Casing setting depth, Bottom Hole Assembly, BHA, Mud motor, Drill collars, Well completion, Hydrocarbon, Drilling rig, Holly field
Frequently Asked Questions
What is the primary purpose of this report?
The report serves as a detailed field development programme for the Holly field, providing the engineering framework necessary for planning, drilling, and completing a 12,000 ft exploratory well.
What are the core technical fields covered in the work?
The document covers rotary drilling mechanics, pressure gradient analysis, cementing chemistry and physics, casing design, and BHA configuration.
What is the main research objective?
The objective is to optimize the drilling and development process of the Holly field by applying engineering calculations and safety standards to the well's design and operational planning.
Which scientific methods are utilized for the development plan?
The work employs predictive modeling for pore and fracture pressure, standard cementing volume calculations, and mechanical design criteria for BHA and casing string selection.
What is the focus of the main content chapters?
The main chapters provide a transition from fundamental drilling concepts to specific operational planning, including calculations for cement slurries and the number of drill collars required.
Which keywords characterize this document?
Key terms include rotary drilling, well planning, pore pressure, cementing, casing setting depths, and BHA components.
How is the BHA configuration determined in this field programme?
The BHA is designed based on specific operational needs, such as the required 21,000 lb weight on bit at a 10-degree inclination, resulting in a selection of 9 drill collars.
Why is the bottom-top design method preferred for this well?
The bottom-top design is used to ensure mechanical integrity and maximum production by creating a design basis that accounts for flow potential and anticipated drilling challenges from the start.
- Arbeit zitieren
- Okoye Uchechukwu (Autor:in), 2014, Field Development Programme for Holly Field, München, GRIN Verlag, https://www.hausarbeiten.de/document/300250
