Casing and Bit Size Selection

A casing and bit size program must consider the problems described in the previous section in addition to the actual casing and bit size characteristics. These characteristics include the following items casing inner and outer diameter A working knowledge of the relationship of these variables is important for the selection of a viable geometry program. Pipe Selection. Casing availability is a priority consideration in hole geometry selection. High-strength casing often required for deep wells...

Types of Casing and Tubing

Oil Drilling Production Casing

production also known as an oil string Fig. 5-1 shows the relationship of some of these casing strings. In addition, the illustration shows some of the problems and drilling hazards that the strings are designed to control. All wells will not use each type of casing. The conditions to he encountered in each well must be analyzed to determine the types and amount of pipe necessary to drill it. The general functions of all casing strings are as follows segregate and isolate various formations to...

Rig Sizing and Selection

Drilling rigs are used to drill the hole, lower and cement casing in the well, and provide a means to perform various auxiliary functions such as logging and well testing. Today's rigs are complicated and require highly experienced, trained personnel for efficient operations. If improperly selected, the rig can be the cause for low penetration rates, formation damage from poor solids control, and high ultimate well costs. In past years, rig selection was often based on footage rating. A...

Accumulator Drawdown Test

Accumulator Unit Drilling Oil Well

Close bag ''Open valves Open bag ' Close valves fnr --- Preventer valve Valve 6-in. D minimum Riser pipe Fig. 16-68 Typical diverter stack Courtesy PennWell Publishing The lines should be as large as possible with a suggested minimum ID of 6 in. Angles and bends should be minimized in the diveiter lines to avoid unnecessary restrictions. The preventer may be a low-pressure sphcrical preventer or some type of diverter bag used to direct the flow into the lines. Choke Manifold. The choke manifold...

Table Common Brine Systems

Clay Hydration

Potassium chloridc K.Ci Sodium chloride NaCl Calcium chloridc CaCE Calcium bromide CaBr, Three-Salt Brines Calcium chloride calcium bromide zinc The potassium ion is particularly effective at plugging the clay lattice to minimize hydration of formation clays, as shown in Fig. 8-7. A sodium chloride system NaCl is probably the most common brine water used in drilling, completion, and workover operations due to its availability. The maximum density for a sodium chloride brine is 10.0 lb gal at 60...

Surface and Subsurface Completion Equipment

Surface Safety Valve Otis

Well completions involve placing flow control equipment at the surface and indie tubing string. These items may include the following major categories surface and subsurface automatic shutdown systems The equipment must be sized and selected for each reservoir and its flow characteristics. The drilling plan should include a wellhead and geometry to accommodate this production equipment. Production Tree. The production, or Christmas, tree provides the connection between the wellbore and the...

Offshore Oil Rig Layout

Oil Rig Layout

Fig. 16-12 Slot-type jackup rig Courtesy Western Oceanic Inc. Fig. 16-13 Cantilever-type jaekup rig Courtesy Western Oceanic Inc. Fig. 16-13 Cantilever-type jaekup rig Courtesy Western Oceanic Inc. of semisubmersibles is stability. They are more frequently out of the range of motion-creating wave periods than are ship vessels. Therefore, their range of acceptable operating conditions is greater. The special designs used for environment operating efficiency have some disadvantages Semis have...

Well Cost Estimation AFE Preparation

Projected Drilling Time, Time Categories, Time Consideration, Cost Categories, Tangible and Intangible Costs, Location Preparation, Drilling Rig and Tools, Drilling Fluids, Rental Equipment, Cementing, Support Services, Transportation. Supervision and Administration. Tubulars, Wellhead Equipment, Completion Equipment A Case study homework problem 774 F Casing and tubing tables 847