- Settore: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
- Company Profile:
A type of packer that uses an inflatable bladder to expand the packer element against the casing or wellbore. In preparation for setting the packer, a drop ball or series of tubing movements are generally required, with the hydraulic pressure required to inflate the packer provided by carefully applying surface pump pressure. Inflatable packers are capable of relatively large expansion ratios, an important factor in through-tubing work where the tubing size or completion components can impose a significant size restriction on devices designed to set in the casing or liner below the tubing.
Industry:Oil & gas
A type of packer that is set by applying tension to the running string. These packers are less common than compression-set packers due to the potential difficulties associated with retrieval. However, in applications where there is insufficient string weight to set a compression packer, a tension packer is a useful option.
Industry:Oil & gas
A type of packer that is run and retrieved on a running string or production string, unlike a permanent production packer that is set in the casing or liner before the production string is run. Retrievable packers are most commonly used in well intervention activities, although some completion designs are more suited to retrievable packers than permanent packers.
Industry:Oil & gas
A type of packer than utilizes an assembly of friction blocks and slips to set and anchor the packer on the casing or liner wall. Hookwall packers generally are run on tubing or drillpipe and typically require some rotation of the packer assembly to activate or set the packer slips. Subsequent application of tension or compression, depending on packer design, will set the packer elements.
Industry:Oil & gas
A type of packer designed for use in openhole applications such as drillstem testing. Openhole packers are typically configured with one large element that can be deformed easily to contact the uneven formation surface, yet retain strength and sufficient integrity to withstand the anticipated differential pressures.
Industry:Oil & gas
A type of oxygen activation technique for measuring water flow in which a short neutron burst is followed by a long observation period, during which the activated flowing oxygen is recognized at the detector by its signature. Stationary oxygen gives a gradually decaying signal, whereas flowing oxygen can be distinguished by a peak at a time after the neutron pulse that is related to its velocity. To cover a wide range in water velocity, several detectors at different spacings are needed. The flow volume can be estimated from the area under the peak. While recordings are typically made with the tool stationary, continuous logs are also possible. <br><br>In an alternative type of impulse method, the neutrons are emitted in regular bursts until the count rate from the activated oxygen reaches a constant level. Then, after terminating the bursts, the time for the count rate to decrease by one half is measured. This time can be related to the water velocity.
Industry:Oil & gas
A type of organic fluid, such as acetic or formic acid, used in oil and gas well-stimulation treatments. The use of inhibited HCl at elevated temperatures is limited to relatively short exposure times because of the risk of increased corrosion. Inhibited organic acids are much less reactive with metals than are HCl or mixtures of HCl and HF. For this reason, organic acids are commonly used successfully at high bottomhole temperatures or when long contact times between acid and pipe are needed, such as during perforating. Organic acids also are used to protect exotic alloys, such as aluminum or chrome-plated parts.
Industry:Oil & gas
A type of nuclear magnetic resonance (NMR) log that is designed to record properly only the bound fluid. Bound fluid is characterized by a fast relaxation time, typically less than 33 ms in sandstones and 100 ms in carbonate rocks. Therefore, the wait time for a bound fluid log can be much shorter than for standard NMR logs, with the result that logging speeds are much faster.
Industry:Oil & gas
A type of multistrand wireline used for slickline applications in which higher tension or weight-carrying ability is required. The most common size of braided line is 3/16-in. Diameter, although special heavy applications use 1/4-in. And 5/16-in. Sizes. When larger sizes are used, it may be necessary to kill the well due to the effect of wellhead pressure on the relatively large cross-sectional area of the line entering the wellbore.
Industry:Oil & gas
A type of mixer used in various oil- and gas-well service activities to prepare treatment fluids or slurries. Recirculating mixers are configured with a tank or vessel, a pump to circulate the fluid, and a manifold system to control recirculation and delivery of the fluid to storage or to the high-pressure treatment pumps. Recirculating the fluid induces turbulence to help ensure a homogeneous fluid.
Industry:Oil & gas
