تعريف الترب تانك واستخدماته اثناء الحفر والترب-Trip Tank in Drilling & Tripping
A calibrated trip tank in drilling is typically used for the accurate dimension of slush volumes and changes to slush volumes while tripping. It must be available on all equipages & be equipped with a position index fluently readable from the drillmaster’s position. Such an index must be accurate to within one- half barrel volume.It's considered unsafe to trip without a trip tank and as similar, spare corridor for the hole fill pump/ motor should be kept at the carriage point
Drilling Trip Tank Definition
A trip tank is a low- volume, calibrated tank that can be insulated from the remainder of the face drilling fluid system and used to directly cover the quantum of fluid going into or coming from the well. A trip tank may be of any shape handed that it's calibrated directly and a means is handed for reading the volume contained in the tank at any liquid position.The readout may be direct or remote, rather both. The size of the tank and readout arrangement should be similar that volume changes in the order of one- half barrel can be fluently detected. Tanks containing two chambers with covering arrangements in each cube are preferred as this facilitates removing or adding drilling fluid without interposing carriage operations.
Trip Tank Application In Drilling
The primary use of the trip tank is to measure the quantum of drilling fluid needed to fill the hole while pulling pipe to determine if the drilling fluid volume matches pipe relegation. Other uses of the trip tank include measuring drilling fluid or water volume into the annulus when there's lost rotation & returns are lost, covering the hole while logging or following containing cement job, calibrating drilling fluid pumps, etc. The trip tank is also used to measure the volume of drilling fluid bled from or pumped into the well as the pipe is stripped into or out of the well.If the fluid position in the hole falls as the pipe is removed a reduction in nethermost hole pressure will do. If the magnitude of the reduction exceeds the trip periphery or safety overbalance factor a well kick may do( this is considered one of the major causes of kicks). The hole must be kept full with a lined- up trip tank that can be covered to insure that the hole is taking the correct quantum ofmud.However, it can be detected, If the hole fails to take the correct slush volume. A trip tank lineup is shown in Fig 1.
Useful Tips
*While pipe tripping, for the first 5 to 10 daises off bottom cover the hole through the rotary. This is to check that the annulus is falling as the drill pipe is removed from the hole. The pipe wiper should thus be installed only after the first daises have been pulled. The trip tank shouldn't be overfilled at this stage to insure that swabbing is easily indicated, should it do. The circulating pump should be switched off at this stage and the hole filled from the trip tank, after each stage.*At any stage while tripping out of the hole, and if the hole doesn't take the correct volume of drilling slush, the pipe should be run back to bottom using the trip tank, and bottoms- up circulated.
*In stripping operations, line over choke manifold so that returns are taken to the trip tank allowing accurate measures to be recorded. Preference is to have a calibrated stripping tank take off from the triptank.However, the worksheet will reflect any net gain over calculated destined unrestricted- end pipe relegation, If this isn't installed.
*A trip tank and hole watcher should be considered if vessel movement creates any problem in measuring drilling fluid conditions on passages.
*It's recommended for floating drilling units that flow checks be performed on the trip tank with the hole fill pump circulating across the bell nipple to exclude carriage stir as much as possible.
*In any shut- in procedure, it's prudent to line up the annulus to the trip tank above the annular BOP or rams. This will help in double- checking to see if they're oohing.
*In Choke Drill, it's desirable to discharge into a trip tank to directly cover inflow rates for correlation with choke opening, pump rates, and pressure drops in the Drilling circulating system and across the choke. This is particularly important for subsea shindig preventer heaps in deep water, which may have significant circulating pressure losses in the choke lines.
*While drilling, the trip tank should be kept half full of slush when pumps are out. During a connection well should be lined up on trip tank as the most likely time to swab or take a kick is when APL is lost with pumps out.
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