300m Taper alloy steel Drilling Fishing Tools

Drilling Tools / Fishing Tools / Female and Male Cones

The male cone and female cone fishing tools are essential equipment for retrieving strings from inner holes. These specialized tools create threads and facilitate fishing operations from the inner holes of various objects including oil pipes, drill pipes, sleeve milling pipes, packers, and water distributors.

• Manufactured from high-quality alloy steel for superior strength and toughness
• Easy thread making capabilities
• Available in right-hand thread (positive thread) and left-hand thread (reverse thread) configurations
• Some models feature chip removal grooves for enhanced performance
• Fishing threads available in serrated and triangular patterns

When the female cone covers one end of a tubular falling object, appropriate weight on bit (WOB) is applied while rotating the drilling tool. This forces the fishing threads to squeeze into the outer wall of the falling fish to create a secure connection. Once the connection can withstand sufficient tension and torque, lifting or reversing methods are employed to retrieve all or part of the fallen objects. The thread-making process operates on an extrusion and feeding principle without cutting.

When the tool approaches 1-2cm from the fish top, initiate the circulating pump for flushing. Gradually lower the tool to the fish top while monitoring pump pressure changes. A sudden pump pressure increase combined with suspended weight reduction indicates successful fish top entry into the female cone, enabling fishing operations.

If hanging weight gradually decreases without pump pressure changes, the fish top has not entered the female cone. In this case, lift the drill string and rotate to align with the fish cavity until noticeable changes in hanging weight and pump pressure occur.

For fish tops with small outer diameters where pump pressure changes are not evident, use guide shoe structures to prevent incorrect thread positioning and potential accidents. Avoid slamming the fish top during operations to prevent damage to either the fish top or fishing threads. Careful analysis and judgment of thread position are critical to avoid serious consequences.

Oilfield taper tap female die coupling geological core drilling fishing tools designed for comprehensive fishing operations in oilfield and geological drilling applications.