Down Hole Shut In Tool

To access client resources.Electronic Memory Recorders.Cased Hole Logging Tools.PDHMS (Permanents).Client Resources.Primary Features and Applications. Simultaneous multi-zone testing. Interference tests. High temperature rating. Eliminates wellbore storage effect. Sour service available.

Modular configuration. Windows OS: Vista/XP/NT/2000.DescriptionThe Multi-Cycle Shut-In Tool (SIT) has been engineered for improved reliability. The instrument has been tested thoroughly, and our engineers have implemented a double-tier mount system that virtually eliminates shock to the electronics. The Multi-Cycle SIT has proven to be a valuable tool in tests where wellbore storage or access to location are factors. The reduction in wellbore storage minimizes test time, and usually improves data quality for analysis, especially when evaluating the effects of near wellbore damage (skin).

The ability to shut-in the well downhole and have it reopen automatically means production need not be lost if the location is not accessible. A single SIT or multiple Shut-In Tools can be deployed in a particular well to facilitate build-up surveys, dependent on the number of independent zones in the wellbore completion profile. This flexibility can provide vital test information at minimal costs to the operator.

Contents.Operation These valves are commonly uni-directional flapper valves which open downwards such that the flow of tries to push it shut, while pressure from the surface pushes it open. This means that when closed, it will isolate the reservoir fluids from the surface.Most downhole safety valves are controlled hydraulically from the surface, meaning they are opened using a hydraulic connection linked directly to a well control panel. When hydraulic pressure is applied down a control line, the hydraulic pressure forces a sleeve within the valve to slide downwards.

This movement compresses a large spring and pushes the flapper downwards to open the valve. When hydraulic pressure is removed, the spring pushes the sleeve back up and causes the flapper to shut. In this way, it is failsafe and will isolate the wellbore in the event of a loss of the. The full designation for a typical valve is 'tubing retrievable, surface controlled, subsurface safety valve', abbreviated to TR-SCSSV.Positioning The location of the downhole safety valve within the is a precisely determined parameter intended to optimise safety. There are arguments against it either being too high or too low in the and so the final depth is a compromise of all factors. MMS regulations state that the valve must be placed no less than 100' below the mudline.Reasons to keep it high The further down the the DHSV is located, the greater the potential inventory of above it when closed. This means that in the event of loss of containment at surface, there is more fluid to be spilled causing environmental damage, or in the worst case, more fuel for a fire.

Shut In Free

Therefore, placing the valve higher limits this hazard.Another reason relates to the hydraulic control line. Hydraulic pressure is required to keep the valve open as part of the design. However, if the valve is too far down the, then the weight of the alone may apply sufficient pressure to keep the valve open, even with the loss of surface pressurisation.Reasons to keep it low As part of the role of the DHSV to isolate the surface from wellbore fluids, it is necessary for the valve to be positioned away from the well where it could potentially come to harm. This implies that it must be placed subsurface in all circumstances, i.e.

In offshore wells, not above the seabed. There is also the risk of cratering in the event of a catastrophic loss of the topside facility. The valve is specifically placed below the maximum depth where cratering is expected to be a risk.If there is a risk of (clathrate) plugs forming as the pressure changes through the valve due to, then this is a reason to keep it low, where the rock is warmer than an appropriately-calculated temperature.Deploying and retrieving Most downhole safety valves installed as part of the design are classed as 'tubing retrievable'. This means that they are installed as a component of the completion string and run in during completion. Retrieving the valve, should it malfunction, requires a.

Downhole Shut In Tool Supply

The full name for this most common type of downhole safety valve is a Tubing Retrievable Surface Controlled Sub-Surface Valve, shortened in completion diagrams to TRSCSSV.If a tubing retrievable valve fails, rather than go to the expense of a workover, a 'wireline retrievable' valve may be used instead. This type of valve can fit inside the and is deployed on after the old valve has been straddled open.Legal requirement The importance of DHSVs is undisputed. Graphic images of in on fire after the after their were removed, demonstrate the perils of not using the components (at the time, they were deemed unnecessary because they were onshore wells).

Downhole Shut In Tool Repair

It is, however, not a direct legal requirement in many places. In the, no law mandates the use of DHSVs. However, the requires that measures are taken to ensure that the uncontrolled release of wellbore fluids is prevented even in the worst case. The brilliance of the act is that it does not issue prescriptive guideline for how to achieve the goal of health and safety, but merely sets out the requirement that the goal be achieved. It is up to the to decide how to achieve it and DHSVs are an important component of that decision. As such, although not a legal requirement, it is company policy for many operators in the.Issues While the DHSV isolates the, a loss of integrity could allow wellbore fluid to bypass the valve and escape to surface through the. For using, it may be a requirement to install a safety valve in the 'A' of the well to ensure that the surface is protected from a loss of annulus containment.

However, these valves are not as common and they are not necessarily installed at the same position in the well, meaning it is possible that fluids could snake their way around the valves to surface.See also.