Drill Pipe Connector Without Rotation
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Solution Overview
Problem
The existing methods for connecting drill pipe segments require rotation and the use of power tongs, leading to excessive torque that can damage the pipes and increase operational costs, while also posing challenges in achieving secure and leak-proof connections without wobbling or unscrewing.
Innovation Solution
A drill pipe connector assembly that allows for the connection of drill pipe segments without rotation, using a connector nut with wicker-type or breech lock-type threads and a retaining shoulder to securely affix the segments, ensuring fluid communication and torque transfer while preventing leaks, and utilizing seal means for pressure integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power tongs are used to transmit rotational torque to make up pipe joints, then secure connections are achieved, but excessive torque can stretch or burst the box member or crack or break the pin member
Solution Approach 1:
The patent replaces the rotational mechanical system (power tongs applying torque) with a linear mechanical system (hydraulic or electric actuator applying axial force). The connector uses a screw mechanism that converts linear motion into rotational motion internally, eliminating the need for external rotational torque application that could damage pipe members.
Solution Approach 2:
The patent introduces a connector assembly with a screw mechanism as an intermediary between the drill pipe joints. This screw mechanism acts as a mediator that achieves secure connections through controlled linear-to-rotational conversion, preventing direct application of excessive torque to the pipe members while still ensuring tight connections.
2Reliability
If high make-up torque is applied to ensure tight threading, then leakage and wobbling are prevented, but the drill pipe segments may be damaged
Solution Approach 1:
The patent substitutes the high-torque rotational making-up process with a controlled linear actuation system. The screw mechanism provides gradual, controlled engagement that achieves leak-proof connections without the sudden high torque spikes that cause pipe damage.
Solution Approach 2:
The patent changes the making-up parameter from rotational torque to linear force. By controlling the axial force applied through the actuator and screw mechanism, the system achieves the necessary connection tightness for leak prevention while maintaining force within safe limits to avoid pipe damage.
3Ease of manufacture
If traditional threaded connections are used, then drill pipe segments can be connected, but rotation is required which increases operational complexity and cost
Solution Approach 1:
The patent replaces the complex rotational making-up operation with a simpler linear actuation system. The hydraulic or electric actuator directly pushes or pulls the connector along the drill pipe axis, eliminating the need for power tongs, rotation control, and associated operational complexity.
Solution Approach 2:
The screw mechanism within the connector assembly performs the rotational engagement automatically as the actuator applies linear force. The system is self-contained, with the screw threads providing both the connection mechanism and the rotational motion generation, reducing external equipment requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution eliminates the need for power tongs, reduces the risk of pipe damage, and enhances operational efficiency by allowing for secure, leak-proof connections and torque transfer without rotating the drill pipe, thereby lowering operational costs and improving safety and ease of use.
Implementation Method 1
The frictional properties of the threaded connections affect the torque required to make up the joints. A higher friction coefficient means increased torque transmitting ability.
Implementation Method 2
The lower section of the connector nut may be threadedly affixed to the connector end of the second drill pipe segment. The inner surface of the lower section of the connector nut may include a first set of threads. The outer surface of the connector end of the second drill pipe segment may include a second set of threads.
Implementation Method 3
The assembly may also include seal means. The seal means may prevent leaking of a pressurized fluid flowing through the first and second bores.
Implementation Method 4
The pin end of the first drill pipe segment may include a first rotational torque transfer profile. The inner surface of the connector end of the second drill pipe segment may include a second rotational torque transfer profile. The first and second rotational torque transfer profiles may operatively engage each other to transfer torque from the first drill pipe segment to the second drill pipe segment.
Data Source
AI summary
A drill pipe connector assembly capable of connecting drill pipe segments without rotation. The assembly includes the pin end of a first drill pipe stabbed within the connector end of a second drill pipe. A connector nut is threadedly connected or snap locked to the connector end of the second drill pipe. The connector nut includes a retaining shoulder cooperating with a beveled shoulder on the pin end of the first drill pipe to retain the first drill pipe. The assembly includes seals to provide pressure integrity and prevent leaking. Cooperating rotational torque transfer profiles in the first and second drill pipes enable operational rotation of the drill string.