Multi Cycle Circulating Downhole Valve DST Tool Pressure And
Function Test
Introudction of Multi Cycle Circulating Valve
Multi Cycle Circulating Valve is a full opening and annulus
pressure-operated re-closable circulating valve, the valve is
operated by repeatedly cycling the annulus pressure and can be open
and closed many times. Multi Cycle Circulating Valve is acceptable
for the formation testing in cased hole, oil tube tradition
perforating tube string testing and cycle operation in the
conjunction of perforation and full-opening formation testing.
Specification of Multi-cycle circulating valve
| Nominal Size /in. | OD /in. | ID /in. | Thread Connections | Length /in. | Working Pressure |
| 3 7/8 | 3.9 | 2 | 2 7/8 CAS | 30.13 | 15000 psi |
| 5 | 5.03 | 2.28 | 3 7/8 CAS | 41.28 | 15000 psi |
Pressure and Function Test of Multi-cycle circulating valve
The Nitrogen Chamber Seal test
Charge the nitrogen chamber with nitrogen which purity is
99.99%(oxygen content is less than 0.1%)from the nitrogen filler
body after finishing the tool assembly, the charging pressure is
27.5MPa (4000PSI), put the tool in the water. Observe it for two
hours .There should be no bubbles. Then take it out and keep the
pressure for eight hours. There should be no pressure drop.
The Ball Valve seal and inner pressure test:
1. Seal and inner pressure test in the upper of the ball: Install
the test caps to both ends of the tool, increase the pressure to
27.5MPa(4000Psi)from the port of the oil case, then bleed off to
20MPa(2800Psi)to function the tool, make the tool in the blank
position Ⅰor Ⅱ(the circulating port is close, the ball is also
closed),increase water pressure to 35MPa(5000Psi) in the upper end
of the ball, keep the pressure for 15 minutes, there should be no
pressure drop.
2. Seal and inner pressure test in the lower of the ball: Install
the test caps on the lower end of the tool, increase water pressure
to 70MPa (10000Psi) in the lower end of the ball, keep the pressure
for 15 minutes, there should be no pressure drop.
Multi-cycle circulating valve Function Test Chart
Multi-cycle circulating valve Function Test Chart Seal Test
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.
