- 行业: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
- Company Profile:
A completion with only a portion of the productive interval open to flow, either by design or as a result of damage. Limited-entry completions in vertical wells are designed to avoid unwanted fluid production, such as gas from an overlying gas cap or water from an underlying aquifer. The effects of limited entry may be seen in perforated and gravel-packed wells when some of the perforations fail to clean up. This is also called a partial completion. <br><br>The limited entry also results from partial penetration, which occurs when the productive formation is only partly drilled. This partial penetration represents a near-well flow restriction that results in a positive skin effect in a well-test analysis.
Industry:Oil & gas
A component installed near the bottom of the casing string on which cement plugs land during the primary cementing operation. It typically consists of a short length of casing fitted with a check valve. This device may be a flapper-valve type, a spring-loaded ball valve or other type. <br>The check-valve assembly fixed within the float collar prevents flowback of the cement slurry when pumping is stopped. Without a float collar, the cement slurry placed in the annulus could U-tube, or reverse flow back into the casing. The greater density of cement slurries than the displacement mud inside the casing causes the U-tube effect.
Industry:Oil & gas
A device used to control the flow of fluids by directing flow through a restriction or hole of a fixed size. The fluid characteristics and the pressure differential across the choke determine the flow rate through a fixed choke.
Industry:Oil & gas
A device used to handle and temporarily store a coiled tubing string. Spoolers generally are configured with a removable drum that allows transport spools to be inserted, allowing a new string to be spooled onto a reel. The term is also occasionally used to describe the levelwind assembly on a tubing reel.
Industry:Oil & gas
A device used to collect water and heavy hydrocarbons that drop out of a gas stream in a pipeline.
Industry:Oil & gas
A device used to collect small liquid droplets (moisture or hydrocarbons) from the gas stream before it leaves the separator. The two most common types of mist extractors are wire-mesh pads and vanes. Once the small droplets of liquid are collected, they are removed along with the other liquids from the separator.
Industry:Oil & gas
A device used to catch and hold the debris flowing in pipelines. Such foreign materials can cause severe damage to meters or other surface equipment.
Industry:Oil & gas
A device used to attach or hang liners from the internal wall of a previous casing string. Liner hangers are available in a range of sizes and specifications to suit a variety of completion conditions.
Industry:Oil & gas
A device used in stage cementing to open the stage collar or diverting valve through which the second or subsequent cement stage is placed. The opening bomb is dropped down the casing string to land in a seat within the stage collar. Applying pump pressure then activates a sliding collar that opens access ports, enabling circulation across the upper casing interval.
Industry:Oil & gas
A device used in a hydraulic system to store energy or, in some applications, dampen pressure fluctuations. Energy is stored by compressing a precharged gas bladder with hydraulic fluid from the operating or charging system. Depending on the fluid volume and precharge pressure of the accumulator, a limited amount of hydraulic energy is then available independent of any other power source. Well pressure-control systems typically incorporate sufficient accumulator capacity to enable the blowout preventer to be operated with all other power shut down.
Industry:Oil & gas
