In the light of the increasing demands of energy consumption, the new hydrocarbon reservoir exploration has been carried out to improve the energy supply. The Holly Field is an untapped hydrocarbon reservoir which contains oil and gas. According to an investigative report, the reservoir is located from 10,500 ft. to 11,750 ft. below the surface. The data from the Holly Field makes it possible to put together an overview of the design of a well there. This report introduces the basic design element of a well with a special focus on the rotary drilling, the well planning, the hydraulic pressure, the casing design, the bottom hole assembly (BHA) equipment and the well completion. In addition, each section will illustrate a design principle briefly. The aim of this report is to outline a comprehensive development programme for the Holly Field well.
Table of Contents
- 1. Introduction
- 2. Rotary Drilling
- 2.1 Introduction to Rotary Drilling
- 2.2 Hoisting System
- 2.3 Circulating System
- 2.4 Rotating System
- 2.5 System Association
- 2.6 Selecting a Land Rig
- 3. Well Planning
- 3.1 Well Planning
- 3.2 Pore Pressure
- 3.3 Fracture Pressure
- 4. Pore Pressure and Mud Weight
- 5. Cement
- 5.1 Introduction to Cement
- 5.2 Lightweight Additives
- 5.3 Retarders
- 5.4 Accelerators
- 5.5 Heavyweight Additives
- 5.6 Cement related calculation
- 6. Casing Design
- 6.1 Purpose of Casing
- 6.2 Principle of Casing Selection
- 7. Selection of BHA
- 7.1 Principle of Selecting BHA
- 7.2 Function of Selected BHA
- 7.3 Determine the number of drill collars
- 8. Well Completion
- 8.1 Options for Well Completion
- 8.2 Bottom-to-Top Design
- 9. A preview of the well design
Objectives and Key Themes
The objective of this report is to outline a comprehensive development program for a new well, the Holly Field well, targeting an oil reservoir located 10,500 ft. to 11,750 ft. below the surface. The report details the well design, focusing on practical application and theoretical principles.
- Rotary drilling techniques and system components
- Well planning, considering pore and fracture pressure
- Cementing operations and the selection of additives
- Casing design and selection principles
- Bottom Hole Assembly (BHA) selection and well completion strategies
Chapter Summaries
1. Introduction: This chapter introduces the complexities of well design, encompassing various engineering disciplines and the need for a comprehensive plan to ensure safety, environmental protection, efficiency, and cost-effectiveness. It establishes the context for designing the Holly Field well, specifying its target (an oil reservoir) and outlining the report's goal of demonstrating basic design principles.
2. Rotary Drilling: This chapter details the rotary drilling method chosen for the Holly Field project, highlighting its flexibility in handling unpredictable situations. It provides an overview of the rotary drilling rig's components—hoisting, circulating, and rotating systems—explaining their functions and how they work together to achieve a complete drilling cycle. Specific system components like the derrick, hoisting mechanisms, and circulating system using drilling mud are discussed.
3. Well Planning: This section covers the crucial aspects of well planning, including the detailed planning process itself and the vital considerations of pore pressure and fracture pressure. These pressures are critical for determining safe drilling parameters and preventing wellbore instability. The chapter likely provides an overview of the methodology used to assess these pressures within the specific geological context of the Holly Field.
4. Pore Pressure and Mud Weight: This chapter focuses on the critical relationship between pore pressure within the formation and the density of the drilling mud. Maintaining the appropriate mud weight is essential to prevent unwanted influxes or losses of drilling fluid, ensuring wellbore stability and preventing potential blowouts. It likely discusses techniques for calculating and controlling mud weight based on the pore pressure profile.
5. Cement: This chapter delves into the use of cement in well construction, covering its various applications and the properties of different additives. It describes how lightweight and heavyweight additives, retarders and accelerators are used to modify cement properties to optimize setting time and strength depending on the specific downhole conditions. The chapter likely includes calculations relevant to cementing operations.
6. Casing Design: This chapter focuses on the purpose and selection of casing strings, crucial for wellbore stability and isolation of different formations. It explains the rationale behind casing selection, considering factors such as pressure, temperature, and the geological characteristics of the formations being traversed. The selection criteria are likely explained in detail.
7. Selection of BHA: This chapter covers the selection and function of the Bottom Hole Assembly (BHA), the equipment at the very bottom of the drill string responsible for drilling the wellbore. It details the principles of BHA selection, considering factors such as the formation properties, desired rate of penetration, and the need to maintain wellbore stability. Calculations for determining the number of drill collars are likely included.
8. Well Completion: This chapter describes the strategies for completing the well once drilling is finished. It focuses on the various options available for well completion and the bottom-to-top design approach used to prepare the well for hydrocarbon production. It would likely detail the equipment and procedures necessary for preparing the well for production.
Keywords
Hydrocarbon reservoir, well design, rotary drilling, well planning, pore pressure, fracture pressure, cementing, casing design, bottom hole assembly (BHA), well completion, drilling mud, Holly Field.
Frequently Asked Questions: Holly Field Well Development Program
What is this document about?
This document provides a comprehensive preview of a report outlining the development program for the Holly Field well, targeting an oil reservoir at a depth of 10,500 ft to 11,750 ft. It details the well design, emphasizing both practical applications and theoretical principles.
What are the key objectives and themes of the report?
The primary objective is to present a complete well development plan. Key themes include rotary drilling techniques and system components, well planning (including pore and fracture pressure considerations), cementing operations and additive selection, casing design principles, bottom hole assembly (BHA) selection, and well completion strategies.
What drilling method is used and why?
The report details the rotary drilling method, chosen for its flexibility in handling unpredictable situations during drilling operations.
What are the key components of the rotary drilling system?
The rotary drilling system consists of a hoisting system (including derrick and hoisting mechanisms), a circulating system (using drilling mud), and a rotating system. The document explains how these systems work together.
How important is well planning, and what factors are considered?
Well planning is crucial. The report emphasizes the importance of considering pore pressure and fracture pressure to determine safe drilling parameters and prevent wellbore instability.
What is the relationship between pore pressure and mud weight?
Maintaining the correct mud weight relative to the pore pressure is essential to prevent fluid influx or loss, ensuring wellbore stability and preventing blowouts. The document likely details methods for calculating and controlling mud weight based on pore pressure profiles.
What role does cement play, and what additives are used?
Cement is crucial for well construction. The report covers cement's applications and the properties of various additives, including lightweight and heavyweight additives, retarders, and accelerators, used to modify setting time and strength.
Why is casing design important, and what factors influence casing selection?
Casing is vital for wellbore stability and isolating different formations. Casing selection considers pressure, temperature, and the geological characteristics of the formations.
What is a Bottom Hole Assembly (BHA), and how is it selected?
The BHA is the equipment at the bottom of the drill string responsible for drilling. Its selection depends on formation properties, desired penetration rate, and wellbore stability. The report likely includes calculations for determining the number of drill collars.
What are the key considerations for well completion?
The report outlines strategies for well completion once drilling is finished, including options for well completion and a bottom-to-top design approach to prepare the well for hydrocarbon production.
What are the key terms associated with this well development program?
Key terms include hydrocarbon reservoir, well design, rotary drilling, well planning, pore pressure, fracture pressure, cementing, casing design, bottom hole assembly (BHA), well completion, drilling mud, and Holly Field.
What is the overall goal of the Holly Field well development program?
The overall goal is to develop a safe, efficient, and cost-effective plan for drilling and completing the Holly Field well to access the targeted oil reservoir.
- Quote paper
- Chia Lin Lin (Author), 2014, A Development Programme for the Holly Field Well, Munich, GRIN Verlag, https://www.grin.com/document/300527
