observation well

observation well

[‚äb·zər′vā·shən ‚wel]
(petroleum engineering)
A special well drilled in a selected location for the purpose of observing parameters such as fluid levels and pressure changes (for example, within an oil reservoir) as production proceeds.
References in periodicals archive ?
Average molar ratios of N[O.sub.3.sup.-]/[Cl.sup.-], N[O.sub.3.sup.- ]/[Na.sup.+], and N[O.sub.3.sup.-]/[K.sup.+] were calculated for each observation well for both data sets and used for the estimation of the molar ratio slope in the spatially grouped observation wells, which in most cases coincide with the well field's inflow areas (Sasnjak and Zitnjak, Petrusevec, Ivanja Reka, Mala Mlaka, Velika Gorica, Zaprude, and Kosnica; see Figure 1).
(1984) A brief review of kriging and its application to optimal interpolation and observation well selection.
Input values for the initial head were obtained from the observation well of the Keila-Kukruse aquifer and from the knowledge of mine dewatering, in case of which water table lowered down to the bottom layer of oil shale.
The first of these methods involves the installation of a shallow (usually less than ten ft in depth) and deep observation well "nest" located on the edge of the surface water feature.
where h(x, t) [L] is the hydraulic head, x [L] is the distance of the observation well from the tidal boundary, Ss [[L.sup.-1]] is specific storage, K [L/T] is the hydraulic conductivity, and e [L/T] represents accretion.
said Wednesday it has detected very high radioactivity levels in groundwater from an observation well at its Fukushima Daiichi nuclear power plant crippled by the March 2011 earthquake and tsunami.
Observation well HR-6 was drilled in Upper Cretaceous sediments (Turonian marlstones and siltstones) approximately 2.5 km south of the HPFZ, near the town of Hronov.
Nine observation well clusters, located to evaluate conditions in all directions from the collection well, are equipped with continuous water level recorders that will register changes in the water table elevation caused by recharge pumping.
This observation well is situated approximately 10 m from a domestic well, used to supply water.
The Observation wells were completed using HQ sized diamond drill holes, allowing for the installation of 1.5 inch diameter PVC pipe with a slotted well-screen set at targeted depths within the ore zone, overlying sandstone, adjacent sandstone, or underlying basement.
Central Ground Water Board (CGWB) carries out ground water monitoring, four times a year, on regional scale through a network of observation wells in the Country.
In particular, 16 samples from 41 observation wells around Noksapyeong Station on Line 6 revealed levels of benzene 1,170 times higher than the government-set safety limit.
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