TTGM-7 Flush Joint
Specification: 2-3/8 In ~ 13-3/8 In
Non-API standard deflected trapezoidal thread is adopted with high-strength connection. Processed on the medium –or thick- walled casing, thread gages can be used directly to detect and test various parameters of the thread.
Conical surface – Conical surface metal seal ensures the seal surface to have sufficient contact width and reasonable contact pressure. Metal – Metal seal system guarantees the excellent air-tight capability under the composite load. The good tightness still can be met after multiple makeups and breakouts. Sealed surface geometric parameters can guarantee its excellent property of anti-gluing.
The torque ledge provides the precise screwed position, and reinforces metal - sealing capability for metal seal surface.
Inner and outer surfaces are really flush to provide the maximum clearance.
Joint low stress design:
It can ensure the joint to be safe and reliable under the corrosive environment.
Straight connection without coupling to maximize annular clearance;
Joint connection efficiency can achieve 50% -60% of pipe strength;
Really flush inner and outer surfaces;
Processed on the medium and thick walled casing.
Downhole Motor Manual