One of the main purpose of drilling operation is to discover and protect pay zone. Underbalanced drilling has the advantage to discover the pay zone at first time. Downhole deployment valve is a special designed downhole tools to solves the problem of how to perform tripping and logging with pressure during underbalanced drilling operation, which is the key concern of underbalanced drilling.
Applications
■ Isolation to downhole pressure, effective protection to reservoirs;
■ Combined with rotary BOPs to replace snubbing units and increase drilling speed;
Technical specifications
9⅝in-47LB/FT 5K DDV
|
Size |
9⅝in-47lb/ft |
|
O.D. |
12in (304.8mm) |
|
I.D. |
8.681in(220.5mm) |
|
Length |
165in(4.191m) |
|
Maximum Internal Differential Pressure |
5,000 psi(35MPa) |
|
Maximum External Differential Pressure |
5,000 psi(35MPa) |
|
Maximum Differential Pressure Across Valve |
5,000 psi(35MPa) |
|
Maximum Temperature |
300 deg F(150℃) |
|
Valve Type |
Flapper~Metal to Metal Seal |
|
Required Actuation Pressure |
500psi~700psi(3.44MPa~4.80MPa) |
|
Tensile Rating |
850,000 lbf (425t) |
|
Metallurgy |
4140/45 |
7in-32LB/FT 5K DDV
|
Size |
7in-32lb/ft |
|
O.D. |
8.25in (209.55mm) |
|
I.D. |
6.094in(154.79mm) |
|
Length |
120in(3.05m) |
|
Maximum Internal Differential Pressure |
5,000 psi(35MPa) |
|
Maximum External Differential Pressure |
5,000 psi(35MPa) |
|
Maximum Differential Pressure Across Valve |
5,000 psi(35MPa) |
|
Maximum Temperature |
300 deg F(150℃) |
|
Valve Type |
Flapper~Metal to Metal Seal |
|
Required Actuation Pressure |
500psi~700psi(3.44MPa~4.80MPa) |
|
Tensile Rating |
600,000 lbf (300t) |
|
Metallurgy |
4140/45 |
Principle of operation
Downhole deployment valve is a special designed tool, combined with the rotary BOP, to perform fully underbalanced operation. During the the entirely underbalanced operation, the downhole deployment valve is firstly pre-set into the top casing, which is used to separate the borehole into the upper and lower parts as required, like electric logging or running screen. Thus, the related downhole tools will be run smoothly in the hole.
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