Techcore Oil Tools Co.,Ltd,
Professional Provider & Manufacture of DST tools, Coiled Tubing Tools & Wireline Tools
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Oil Well Downhole Testing Rupture Disk Safety Circulating Valve Full H2S
The rupture disk (RD) safety circulating valve is the component of the DST toolstring, with the functions of both a safety valve and circulating valve. The RD safety circulating valve workes as a safety valve when the annulus pressure reaches a predetermined value. At that pressure, the valve isolates the workstring below the tool and establishes communication between the annulus and the workstring above the tool. The Rupture Disk Circulating Valve can be converted into a circulating valve when the ball valve section is removed and attach a lower adapter called RD Circulating Valve.
The valve can not be open when closed in downhole operation. RD Circulating valve is the same as RD Safety circulating valve except short of ball valve section, the annulus pressure made RD burst and the pressure goes into RD hole and push circulating mandrel forward, then open the circulating ports.
The RD circulating valve is composed of three major sections:
1. The power section consists of a power mandrel case and rupture disk that is available for a wide range of pressure applications. The rupture disk bursts at a predetermined pressure, allowing annulus pressure to be applied to a differential area on the power mandrel. The power mandrel moves down, first pushing the ball valve closed, and then opening a set of circulating ports.
2. The circulating section consists of a set of ports that are initially sealed by the power mandrel. When the rupture disk bursts, the power mandrel moves down, exposing the ports that allow communication between the annulus and workstring.
3. The safety valve consists of a ball valve, operating pins, and collet fingers. As the power mandrel moves down, the operating arms close the ball valve. The collet fingers expand, allowing the power mandrel to continue traveling down to open the circulating ports
Technical parameter of Hydraulic Circulating Valve
| Specifications | 5" |
| OD | 127.5mm |
| ID | 57mm |
| Length | 2312mm |
| Working Pressure | 105Mpa |
| External Yield Pressure strength (Collapse Pressure) | 139Mpa |
| Working condition | Full H2S |
| Service environment | Mud, Crude Oil, Natural gas NACE MR0175(>175F) |
| Service temperature | --29oC~+204oC |
| End connections | 3 7/8 CAS, 3 1/2" IF |
Advantage of Techcore Oil Tools
Techcore Oil Tools expertise in manufacture of the Drill Stem Testing Tools for more than Ten years, the professional Reserch and Development (R&D) department improves the advanced technology in design of the Drill stem testing tools for well testing service.
Techcore designs and chooses the raw material of DST tools according to the customers' oil well condition, and make all our effort to supply the cost effective well testing tools to satisfy the customer, and improve the test tools to meet the industry’s demand for ultra-high pressure and temperature downhole operation.