Nan Gall — Energy Systems

measured performance

A comprehensive range of oilfield data acquisition systems

Downhole Shut-in Tool

A typical deployment of the downhole shut-in tool is below a lock mandrel and equalising sleeve with a shock absorber situated between the shut-in tool and the memory gauges below.

The shut-in tool is electronic and is set to operate at surface with a time delay, which can be programmed into the tool either via a personal computer or, more typically, through Nan Gall Energy Systems’ hand-held programming device.

Quartz memory gauges, when used in conjunction with a downhole shut-in tool can produce many benefits when compared with shut-ins at surface.

Shut-in Tools

Nan Gall’s downhole shut-in tool, in conjunction with Nan Gall memory gauges, can produce benefits in the following circumstances:

  • Wellbore storage effects during pressure build-up surveys can ‘mask’ the reservoir flow period, thus making interpretation very difficult.
  • Leaking flow-line valves on many older wells can mean that true surface shut-in is never achieved
  • Oil-gas wells, when shut-in at surface, can have a large gas cap forming which gives erroneously high bottom-hole pressures
  • The length of time wells must be shut-in at surface to achieve useful bottom-hole pressure information is excessive
  • Pressure fall-off data following water injection is always distorted by the hydrostatic column above the gauges
  • The downhole shut-in tool eliminates wellbore storage effects during pressure build-up surveys that mask the reservoir flow period and render interpretation extremely difficult.
  • Deployment of the simple-to-operate Nan Gall Energy Systems shut-in tool can remove the disadvantages and provide improved bottom hole condition information.
Tool Type Outside Diameter Maximum Pressure Range Maximum Temperature Maximum Differential Pressure
Downhole Shut-In Tool 1.75” (4.45cm) 10,000psi 150°C (302°F) 5,000psi
Downhole Shut-In Tool 2.55” (6.35cm) 10,000psi 150°C (302°F) 5,000psi
Downhole Shut-In Tool 3.5” (8.89cm) 10,000psi 150°C (302°F) 5,000psi

 

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