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Copy of drill stem testing ( EXPRO )
Transcript of Copy of drill stem testing ( EXPRO )
Hesham Khaled What is DST ? A fast and safe way to evaluate the productive zones.
Measures and record downhole formation pressures & temperature versus time.
DST tools allow formation fluids flow to the surface.
In 1926 Johnston brothers developped the first downhole testing tool
The first tool incorporated a tester valve and a conical packer
The 1930s saw the introduction of water cushion
During 1940s reverse circulating sub was invented
In the 1950s, tubing conveyed perforating was introduced DST Investment strategy Initial $50m investment budgeted over 3 years
Year 1 targets – bring existing tools to full operational capability, manufacture and ship new tool packages and ancillaries, giving us 20 job capability ex-works by April 2011
Year 2 targets – bring the base capacity from 20 to 40 jobs
Year 3 targets – achieving long term development goals Operational experience in more than 10 international countries
More than 380 jobs completed by Expro
Core tools have a proven track record over the last 20 years with major operators (see below) Track Record DST – MENA regional capability 4 mobile support workshops & 30’ tool basket sets nearing completion 3 x job capability in MENA
Function Isolate the target zone
Convey fluid to the surface
Acquire Downhole data
Control the well flow at depth History of DST Drill Stem Test Equipment DST Basic Tools Any questions ?? Agenda 1-Introduction
3-DST Equipment Slip Joint (SLPJ) Multi-cycle Circulating Valve Single-cycle Circulatin Valve Tubing Tester Valve
(TTV) Slip joint It is a telescoping tool joint run in the tool string , allow five feet travel .
It compensate for internal volume due to temprature It gives unrestricted flow between tubing and annulus, once opened ,the tool is retained in this position by locking ring and cannot be reclosed Annulus Operated Reverse Valve Multi Reverse Spot Tool It provides a means of establishing communication between the annulus and the drill string. It has three functional positions: closed, reverse, and circulate, and may be run in the well in either the closed or reverse positions.
Pressure Operated Tester Valve Annulus pressure operated downhole ball valve.
Run with nitrogen section which compensates for changes in annulus hydrostatic pressures.
Work with either retrievable or permanent packers
Pressure Operated Tester Valve Gauge Carrier Gauge Carrier Normally run directly below the POTV to record pressure Transient data.
Expro GC can carry up to 6 1.25'' O.D. guages for recording annulus & tublar pressure and temprature versus time. TTV is a ' single shot ' ball valve used for pressure testing tublars as they are run in the hole , it holds up to 15000 PSI.
Once the test string is at depth the tool is opened by bursting a high accuracy rupture disc. ( Locked Open ) Tubing Tester Valve Hydraulic Jar Hydraulic Jar it is used for the purpose of freeing stuck pipe and tools in the wellbore by delivering heavy impact blows to the test spring by storing energy within the tool The safety joint provides for an emergency release between the work string and the packer.
Over shoot can be run to reconnect the work string with the packer assembly. Safety Joint
Large internal bypass area maximizes running and circulating rates
Hydraulic hold-down slips hold packer in place with differential pressure from below Retreivable Packer Retreivable Packer Safety Joint Prove reservoir potential
Confirm well performance
Improve field productivity
Help investors to take the right decision Importance of testing for investors