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Nov 6, 2023 · A well casing is a tubular structure placed in the well to maintain the well opening from the target groundwater to the surface. It plays a pivotal role in: Protecting the well from external contaminants and ensuring that the water drawn from the well remains clean.
- Chapter Description
- Regulatory Requirements - Hole & Casing
- Well Record - Relevant Sections - Hole & Casing
- Key Concepts
- Common Types of Well Construction
- What to Consider When Constructing A Water Supply Well
- Constructing Wells by Different Methods
- Recording Geological Information
- Encountering Gas, Contamination and Water Quailty Problems
- Casing
This chapter covers common well construction methods and materials used in Ontario. The minimum requirements for the hole, casing and well screen and advantages and disadvantages of wells constructed using different equipment and materials are also covered. This chapter is structured to parallel the steps involved in the construction of the hole, i...
Relevant Sections - The Wells Regualtion
1. Log & Field Notes – Section 12.1 2. Covering of Well – Section 12.2 3. Surface Drainage – Section 12.3 4. Well Depth Requirements – Section 12.4 5. Well Pits – Subsections 12(7), (7.1), (8) and (9) 6. Casing – Section 13 7. Deepening of Wells – Section 13.1 8. Annular Space – Subsection 14.2(1), Subsection 14.2(2) paragraph 2, Subsection 14.3(1), Subsection 14.4(1), Subsection 14.4(2) paragraph 3, Subsection 14.4(3) 9. Double Walled Casing – Section 14.6 10. Information – Subsection 16(3)...
The Requirements - Plainly Stated
Reminder: Figure 5-23 to Figure 5-30 at the end of this chapter show many of the requirements listed in the Plainly Stated section Reminder: See Table 5-7 in this chapter for advantages and disadvantages of different types of well casing. The Wells Regulation does not allowthe use of certain materials as well casing for new well construction. Some examples include the following: 1. Casing such as large diameter perforated corrugated pipe (culvert) not approved for potable water use, 2. Plasti...
Relevant Sections - Additional Regulations Or Legislation
Ontario Regulation 213/91 (Construction Projects) as amended made under the Occupational Health and Safety Act Ontario Regulation 387/04 (Water Taking) as amended made under Ontario Water Resources Act
The Wells Regulation- The graphic below shows a sample of the details to be completed on the well record when constructing the hole and installing the casing and well screen in the well. Figure 5-1: Well Record - Relevant Sections Well Use 1. Public 2. Domestic 3. Livestock 4. Irrigation 5. Industrial 6. Commercial 7. Municipal 8. Test Hole 9. Cool...
Contructing the Hole
Prior to constructing the hole, the person constructing the well should research and assess the site and surrounding area using the tools outlined in Chapter 4: Siting the Well, Table 4-3: Important Information and Actions for Researching and Assessing a Site. Proper research and assessment covers the location of aquifers, nature of geological formations, sources of contaminants, the purpose of the well and site accessibility. Successful completion of a well depends on the use of equipment an...
Casing
Definition - The Wells Regulationdefines casing as “pipe, tubing or other material installed in a well to support its sides, but does not include a well screen.”
Well Screen
Definition - The Wells Regulationdefines a well screen as perforated pipe or tubing, unsealed concrete tiles or other material installed in a well to filter out particulate matter, and form the water intake zone. To prevent water bearing formation collapse into the well and reduce sediment or particles in the well water, a well screen should be installed in all unconsolidated formations, in most semi-consolidated formations and sometimes in bedrock.
There are four main types of wells constructed in Ontario: 1. Drilled 2. Bored/Augered 3. Dug (by hand or excavating equipment) 4. Driven or jetted Table 5-2, below provides general characteristics, advantages and disadvantages of the common types of wells.
Persons constructing water supply wells should research, and be familiar with, the geologic formations in the areas where they construct the wells.
The following sections provide the key considerations when constructing the hole. Figures 5-23 to 5-30 in the “Diagrams for Common Well Types” section, at the end of this chapter, further illustrate well construction considerations.
The Wells Regulationrequires that the person constructing a new well make a log of the overburden and bedrock materials (geological formations) and keep up-to-date field notes at the well site. This requirement also applies if the person is deepening the well. A well that is constructed by the use of a driven point are exempt from the requirement t...
The Wells Regulationrequires that the person constructing the well notify the well purchaser, the owner of the land on which the well is located and the Director if natural gas is encountered. Definition - Natural gas or other gas is a gas produced from a well that has the potential to create conditions for explosions, poisoning, fire, asphyxiation...
Definition - The Wells Regulationdefines casing as pipe, tubing or other material installed in a well to support its sides, but does not include a well screen. Casing acts to stabilize the hole, prevents unconsolidated overburden materials from entering the well water column, accommodates the pumping, or other equipment, and may be used to seal off...
A well casing serves as the water-tight, protective lining for a well, typically made from steel or PVC. It is installed when the well is constructed. The well casing services as the structural support for the well and prevents contamination, such as sediment and bacteria, from entering the well.
Each length of casing is referred to as a casing string. The interior of the casing is composed of steel and is smaller than the diameter of the well. The casing of the well is accomplished in phases, beginning with the largest diameter casing and ending with the smallest. Each section of the casing is connected by a collar or coupling.
This video describes the different types of casing used for well construction. By the time, a well is drilled to its final depth, it usually has several stri...
- 8 min
- 19.3K
- Petro Proficient
Dec 16, 2015 · When the casing shoe reaches the casing seat depth, the hanger should land on the casing housing. In some cases, pup joints of casing are needed to land the casing hanger at the shoulders into the spool. Using this type of casing can be risky when reaching the bottom of the wellbore is a difficult issue.
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The well casing is topped by a watertight well cap. In the cable tool method of well drilling, the casing is installed as the drilling proceeds. In the rotary drilling method, the hole is oversized, so the casing pipe is set in the well after the full depth has been reached. In this case, the space between the hole and the outer walls of the ...
