Techcore Oil Tools Co.,Ltd,
Professional Provider & Manufacture of DST tools, Coiled Tubing Tools & Wireline Tools
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Cased Hole Drill Stem Downhole Valve High Pressure Tester Valve AISI Alloy Steel
Brief of LPR-N Valve
The LPR - N Valve is the tester valve with a full bore feature, the LPR -N valve is annulus pressure-operated valve. The LPR-N Valve is used in cased holes to measure multiple closed-in pressures where pipe manipulation is restricted and a full-opening string is required. The nitrogen chamber of the LPR-N valve is charged at the surface to a selected pressure determined by surface temperature,bottomhole temperature, and bottomhole pressure. It is served as the master tester valve in drill stem testing operation.
Structure of the LPR-N Valve
Tester valve consists of Ball valve section, Power section and Metering Section.
* Ball valve section
The ball valve section contains the ball valve and related mechanical components that rotate the ball.
When the tool is activated, the ball is rotated to the open position, allowing the reservoir to flow into the
test string
* Power/nitrogen section
The power/nitrogen section contains the shear pins, operating piston, and nitrogen chamber. In the power
section, one side of the piston is exposed to annulus pressure, and the other is exposed to pressurized
nitrogen, which acts as a large gaseous spring.
* Metering section
The metering section of the LPR- N Valve is isolated from the annulus fluid by an oil and floating piston barrier to control the rate of pressure change.
Specification of LPR-N Valve
| Specifications | 5" |
| OD | 127.5mm |
| ID | 57mm |
| Length | 4940mm(3 1/2"IF BXP) |
| Working Pressure | 105Mpa |
| Diff. pressure over ball valve | 70Mpa |
| Diff. pressure to Ball valve open | 35Mpa |
| Internal Yield Pressure strength | 140Mpa |
| External Yield Pressure strength | 130Mpa |
| Tensile Strength(Yield) | 1947KN |
| Torque Strength | 61KN.m |
| Service environment | Mud, Crude Oil, Natural gas NACE MR0175(>175F) |
| Service temperature | --29oC~+204oC |
| End connections | 3 7/8 CAS, 3 1/2" IF |
About Techcore Oil Tools
Techcore Oil Tools has the professional Reserch and Development (R&D) department with skilled engineers whom were committed to the design of downhole tools for more than ten years and Techcore is equiped with advance equipments to manufacture the oil downhole tools and its related parts in high quality.
The drill stem testing tools are applied in cased hole, open hole and slim hole, the main DST tool string includes RTTS packer, circulating valve, safety joint, select tester valve, omni valve, hydraulic jar, shock absorber, RD safety circulating valve, high pressure retrievable packer with bypass, IPO valve, tubing string test valve, and so on.
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