High Pressure RD Circulating Valve Full H2S Service Well Testing
DST Tool
Introudction of Multi Cycle Circulating Valve
Multi-cycle circulating valve is a kind of circulating valve, which
is used in well testing service. The valve made of Inconel alloy
steel is served in Full H2S well condition. The multi-cycle
circulating valve is acceptable for the full-opening formation
testing in cased hole, oil tube tradition perforation, tube string
testing and cycle operation in the conjunction of perforation and
full-opening formation testing. The multi-cycle circulating valve
overcomes the shortcomings of some other circulating valve, at a
certain position, can use the annulus pressure to operate other
tools many times and there is no influence upon the multi-cycle
circulating valve
Working principle of Multi Cycle Circulating Valve
Multi-cycle circulating valve completes the function by increasing
and releasing the annulus pressure .
According to the construction features it can be learned when
increasing the annulus pressure, the piston push the hydraulic oil
to move to the left, and the hydraulic oil push the check valve
assemblies to move to the left until to the upper dead point, then
the hydraulic oil pass the passageway and push the floating piston
in the nitrogen chamber, thus the pressure is saved in the nitrogen
chamber.
When releasing the pressure, because the pressure in nitrogen
chamber is above the annulus
pressure ,the nitrogen pressure push the floating piston in the
nitrogen chamber and then to hydraulic oil move to the right, the
check valve assemblies to move to the right under pushing of
hydraulic oil until
to the lower dead point, the hydraulic oil make the nitrogen
pressure equal to the annulus pressure.
Technical parameter of Multi-cycle circulating valve
| No | Specification | 5” |
| 1 | OD | 127.5mm |
| 2 | ID | 57mm |
| 3 | Length | 6555mm |
| 4 | Working pressure | 105Mpa |
| 5 | Internal Pressure strength | 146Mpa |
| 6 | External pressure strength | 136Mpa |
| 7 | Tensile strength | 2034KN |
| 8 | Torque strength | 31.6KN.m |
| 9 | Circulating Flow area | 2280mm2 |
| 10 | Service | Full H2S |
| 11 | Working temperature | -29℃～+204℃ |
| 12 | Connection thread | 3 7/8″CAS.B×P or 3 1/2″IF.B×P |
Well Testing Multi Cycle Circulating Valve High Pressure Full H2S
Service DST
HSE﹡Safety instructions:
* When running each pressure test, the pressure must be increased
gradually. When the pressure is up
to 20MPa, hold on for one minute, then every 10MPa keep it for one
minute until the rating pressure;
* During pressure testing, the DST tool should be placed in the
test pit and cover the protecting board on
the pressure test plug.
* During the whole testing process, make sure the entire test
operator keep away from plug and joint
which may lapse.
* Test area should set isolation, others except operator not
allowed to enter test area.
* If there is anybody in the test area, it should set isolation,
avoiding test production fly off the test area.
