دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

The equivalent mud weight felt by the formation when circulating with a certain mud weight and holding a backpressure. A 10 lb/gal mud in a 10,000 ft well with 1000 psi backpressure would generate an equivalent mud weight of about 11.9 lb/gal.

wellbore tubulars run in like conventional completions but mechanically enlarged downhole once in place. Can include combinations of sand screens, blank pipe and annular isolation seals used in lieu of gravel packs.

n: the solid stratum granulosum which forms on the borehole wall after the fluid dehydrations in the layer with cellules




filtration control established on the surface of the wellbore by particles large enough to bridge on the entry of the pores.

n: the factors leading stuck are as follow:(1)the cuttings not being cleared (2).borehole wall sloughing (3) wellbore
leaking (4) key slot or pressure difference

n: in drilling, the entrance of formation fluids into the wellbore because hydrostatic pressure is less than formation pressure.

influx into the well bore.

v: to pump drilling fluid into the wellbore while the pipe is being withdrawn to ensure that the wellbore remains full of fluid enen though the pipe is being withdrawn to ensure that the wellbore remains full of fluid even though the pipe is withdrawn. Filing the hole lessens the danger of a kick or caving the wall of the wellbore.

n: pour fluid into the well during hoisting to fill up the wellbore so as to prevent blowing and slough caused by less fluid column pressure

n: Pumping drilling fluid continuously or intermittently into the wellbore to maintain the fluid level in the hole near the surface. The purpose is to avoid danger of blowout, water intrusion and/or caving of the wellbore.

materials that reduce the fluid loss from a wellbore fluid. May include Bentonite clays, lignite, CMC, etc.

n: an object that is left in the wellbore during drilling or workover operations and that must be recovered before work can proceed. It can be anything froo1 a piece of scrap metal to a part of the drill stem. v: 1. to recover from a well any equipment left there during drilling operations, such as a lost bit or drill collar or part of the drill string. 2. to remove from an older well certain pieces of equipment (such as packers. liners, or screen liner) to allow reconditioning of the well.

n: Any object in a well that obstructs drilling or operation;usually pipe or junk.

a lost piece of equipment in the well.

n: the procedure of recovering lost or stuck equipment in the wellbore. See fish. fishing assembly n: seefishing string.

n: The application of tools, equipment, and techniques for the removal of junk, debris, or fish from a wellbore. The key elements of a fishing operation include an understanding of the dimensions and nature of the fish to be removed, the wellbore conditions,