This article presents the definition of the various casing types: conductor, surface casing, intermediate casing, production casing and liner. Marine Conductor (Offshore) This is for offshore drilling operations from jack-up rigs. It consists of a pipe driven, jetted, or cemented in a pre-drilled hole to provide structural strength, to cover very soft formations below the … Casing types definitions
This article presents the definition of the various casing types: conductor, surface casing, intermediate casing, production casing and liner. Marine Conductor (Offshore) This is for offshore drilling operations from jack-up rigs. It consists of a pipe driven, jetted, or cemented in a pre-drilled hole to provide structural strength, to cover very soft formations below the … Casing types definitions
Casing designs for wells in which gas-lift completions are to be installed are based upon different design load cases from standard wells. They have to be treated differently from standard wells in two respects: definition of the possible pressure profiles within the “live” tubing/production casing annulus (A-annulus) design of the intermediate casing to withstand the … Gas-lift well
Production of hydrocarbons will, in time, lead to a reduction in reservoir pore pressure if pressure is not maintained by a drive mechanism. The resulting increase in effective stress leads to reservoir compaction and deformation of the overburden. The vertical strain caused by this compaction of the producing interval is transferred to a certain extent … Reservoir compaction environment
For a slim hole casing design all the design loads, inclusive burst, collapse, and tensile load requirements, should be determined as for all other wells. For a fixed influx volume and assuming a single bubble of gas, the smaller annular cross section causes a greater influx height than in conventional holes. This might influence the … Slim hole well
The design of steam wells is complicated by the fact that the axial stress exceeds the yield strength in compression during heating and exceeds the yield strength in tension during subsequent cooling. As such, a design is required which incorporates post yield behaviour of both casing and connections. A brief discussion of the issues involved … Steam well
When a hole is drilled through a salt formation, and subsequently casing is set, the salt will gradually move and make contact with the casing. The following paragraphs describe the loading on the casing, and then the capacity of the casing to withstand such loading. Casing loading The plastic behaviour of salt formations may result … Squeezing salt well
This article describes the various responsibilities for casing running operations and quality control. Responsibilities for casing/liner preparation, hole conditioning and mud conditioning prior to running are listed in the following table: Action Execution Quality Control Ordering Casing/Liner, accessories and backup Equipment and Logistics Supervisor Operations Engineer Order running equipment Drilling Supervisor Operations Engineer Drilling Supervisor … Casing Operations Responsibilities
Centraliser spacing and float equipment for Vertical wells: Hole Size, in Casing Size, in Number of Centralizers Shoe Track Design Remarks 26 20 2 1 centralizer over a stop collar on the shoe joint Use a B&W self fill shoe Install the DOS B&W lock down collar above the shoe Install one rigid centralizer … Example Casing Centralisers Programme
General guidelines to minimise casing wear include: limiting build up rates deepening kick-off points optimising drillstring design to reduce contact loads or employing suitable hardbanding minimising rotating hours modifying operating practices to reduce well tortuosity and rotating hours using drillpipe protectors or torque reducing subs in critical zones. Drill Pipe Protectors and Torque Reducing Subs … Minimising Casing Wear