دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see fracture gradient. frac job n: see formation fracturing.

n: The pressure gradient, generally stated in psi/ft [kPa/m], at which a specific formation interval breaks down and accepts fluid. Determining the frac gradient is a key requirement in designing and analyzing a hydraulic fracturing treatment.

n: the pressure gradient (psi/foot) at which a formation accepts whole fluid from the wellbore. Also called frac gradient.

n: a measure of how the strength of the rock (i.e.its resistance to breakdown) varies with depth.

the gradient needed to initiate a fracture.

n: comparison of the sum of the volumes of gas production or receipts with the sum of the volumes of the dispositions of the gas.

n: a discrepancy between a transporters receipts and deliveries of natural gas for a shipper. Most pipelines require that shippers deliveries to the pipeline and receipts from the pipeline remain essentially in balance within certain tolerances, or the pipeline may assess charges or penalties until the imbalance is rectified.

n: the procedure of recovering lost or stuck equipment in an uncased wellbore.

attempts to retrieve pipe of tools lost in the open hole.

pressure temperature survey.

n: (RQ) 1. the quantity of released hazardous materials that, when exceeded, must be reported under CERCLA. The EPA is charged with setting the allowable limits for releases of each hazardous material. If a release exceeds the EPA reportable quantity, CERCLA requires that the owners or operators of the facility notify the National Response Center immediately. 2. SARA (section 304) also requires facilities that release a reportable quantity of an EHS or CERCLA hazardous substance to notify the SERC and the LEPC immediately. This requirement is similar to the CERCLA requirement to notify the NRC in case of reportable releases. Like CERCLA, SARA exempts federally permitted releases, continuous releases, any release contained 00 site, as well as other CERCLA exemptions from RQ reporting requirements. In addition, SARA requires a written followup report to be submitted to the SERC and the LEPC as soon as practicable after the release.

n: 1. an extra support placed under the middle of racked pipe to keep the pipe from sagging. 2. a relatively narrow splinter of a rock formation that is stratigraphically disjointed. interrupts the consistency of another formation. and makes drilling that formation less predictable. A shale formation. for example. may be broken by a stringer of sandstone.

n: 1. a well about which information is restricted for security or competitive reasons. 2. a section of the hole that, for some reason, is undergauge. For example, a bit that is worn undergauge will drill a tight hole.

n: A section of a wellbore, usually openhole, where larger diameter components of the drillstring, such as drillpipe tool joints, drill collars, stabilizers, and the bit, may experience resistance when the driller attempts to pull them through these sections

an exploration well or other project where information is not released to the public.