Used with permanent type packers to provide isolation between the producing zone and the annular space above the packer when the tubing is located into the packer. The seal assemblies are designed with external seals on the tubing which pack-off in the polished bore of the packer or a packer extension (used to retain the … Seal Assemblies (Locator, Anchor, Latch)
This article describe the completion packer selection, specifications, classification, setting mechanism, etc. Packer selection/specification … Completion Packers
Tubing movement and stress behaviour are a function of the well temperatures and pressures: The changes in temperature will cause the tubing to expand and contract. For example, 10,000 ft of tubing suspended in a well will shorten by 16.6 inches with a temperature drop of 20°F. Pressures inside and outside the tubing above the … Tubing movement, forces and stresses
Material selection is determined by the abrasion and corrosion properties of the fluid, the pressures and the mechanical and hydraulic loadings on the completion string under operating conditions, e.g. stimulation, injection and production conditions. Tubing stress calculations will allow specification of threaded coupling type, and material as well as identifying the need for a dynamic … Completion Tubing – Material Selection
Corrosion generally involves carbon dioxide (CO2), sweet corrosion, or hydrogen sulphide (H2S), sour corrosion. In both cases, water must be present for corrosion to occur. The problems can be minimised through the circulation of corrosion inhibiting chemicals or the selection of corrosion resistant alloys. The primary factors that affect the severity of corrosion are the … Corrosion
Early planning of artificial lift is essential for long-term profitability of the wells. Decisions on the artificial lift method to be used may not be available at the field development planning stage. In most cases the artificial lift systems are installed at a later stage in the field life cycle as reservoir energy is depleted … Completion Design – Artificial Lift
This article describe the categories and types of seals used for completion equipment. 2 categories of seals: static seals where the sealing surfaces do not move relative to one another, dynamic seals where the sealing surfaces do move relative to one another. 3 types of seals: polymeric or resilient seals. Which are either elastomeric (natural … Completion Seals
The purpose of the Safety valves is to protect people, environment and property from uncontrolled production. SSV: Surface Safety Valves: an automatic fail-safe closed valve fitted at the wellhead. SSSV: Subsurface Safety Valve: a valve installed in the tubing down the well to prevent uncontrolled flow in case of an emergency through the tubing when … Safety Valves
This article describes the Standard Completion Designs. Monobore completion Completion with fullbore access across the payzone, without diameter restrictions (but not necessarily with a constant diameter from top to bottom). The monobore concept optimises the opportunity for well intervention through the Xmas tree, i.e. rig-less, and is applicable to any completion diameter. By working through … Standard Completion Designs
The well completion typically includes the perforations, sand exclusion system, (liner), tubing, wellhead, tubing accessories, packers, associated safety equipment and Xmas tree. The perforations, gravel pack etc. provide the ‘inflow system’ into the well structure, while the tubing with flow controls, safety devices for isolating the reservoir, the Xmas tree and, where necessary, artificial lift … General completion design considerations