- 行业: Oil & gas
- Number of terms: 8814
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A well shut in slightly above the producing formation by use of special downhole tools containing a valve that can be preprogrammed or controlled from the surface. This practice is commonly associated with drillstem tests. Technology exists to employ bottomhole shut-in in suitably equipped completed wells.
Industry:Oil & gas
A well shut in at the surface, rather than downhole. Most transient well tests are conducted in this manner for convenience.
Industry:Oil & gas
A well produced by use of some kind of downhole pump. Pumps are required when the formation pressure is not sufficient to allow flowing production of fluids at the desired or necessary rate. The performance of well tests on pumping wells is always complicated by the presence of the pump, which often must be removed to take downhole pressure measurements. Downhole pressure measurements in pumping wells are usually made by measuring the rise in liquid level in the well. This is often accomplished by sonic devices, like well sounders, that measure the response time of sound waves bounced off the downhole liquid surface. Most oil wells are eventually put on pumps as pressure declines during production. The exceptions are in strong waterdrive reservoirs or in settings where pressure maintenance by gas or water injection is sufficient to maintain a high reservoir pressure.
Industry:Oil & gas
A well in which the wellhead, Christmas tree and production-control equipment is located on the seabed.
Industry:Oil & gas
A well in which the formation pressure is sufficient to produce oil at a commercial rate without requiring a pump. Most reservoirs are initially at pressures high enough to allow a well to flow naturally.
Industry:Oil & gas
A well in which the maximum production rate is fixed by law. These laws were developed by producing states primarily to control the market and avoid periodic price collapses.
Industry:Oil & gas
A well in which fluids are injected rather than produced, the primary objective typically being to maintain reservoir pressure. Two main types of injection are common: gas and water. Separated gas from production wells or possibly imported gas may be reinjected into the upper gas section of the reservoir. Water-injection wells are common offshore, where filtered and treated seawater is injected into a lower water-bearing section of the reservoir.
Industry:Oil & gas
A well equipped with monitoring equipment and completion components that can be adjusted to optimize production, either automatically or with some operator intervention.
Industry:Oil & gas
A well completion that has no casing or liner set across the reservoir formation, allowing the produced fluids to flow directly into the wellbore. This type of completion suffers the major disadvantage that the sandface is unsupported and may collapse. Also, without any casing or liner installed, selective treatments or remedial work within the reservoir section are more difficult.
Industry:Oil & gas
