Roller Cone Drill Bit Pressure Relief Mechanism

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Solution Overview

Problem

Roller cone drill bits face issues with lubricant pressure management, leading to potential damage from excessive pressure and lubricant loss, which reduces drilling efficiency and increases maintenance frequency.

Innovation Solution

Incorporating a pressure release mechanism, such as a floating bead or check valve, within the drill bit's lubricant system to divert excess lubricant from the primary pressure compensation system to an intergland lubrication system, maintaining optimal lubrication levels and preventing lubricant loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If lubricant pressure is maintained to minimize damage to bearings and seals, then reliability is improved, but lubricant loss increases due to expulsion from the reservoir

Engineering Contradiction:

Improvebearing and seal integrityVSAvoidlubricant loss

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

A check valve is introduced as an intermediary component in the lubricant delivery system. The check valve allows lubricant to flow from the reservoir to the bearing chamber when pressure is sufficient, but prevents backflow and expulsion when pressure drops, thereby maintaining reliability while reducing lubricant loss.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system changes the pressure parameter dynamically by using a check valve to control flow direction. When reservoir pressure exceeds a certain threshold, lubricant flows to the bearing chamber; when pressure drops below the threshold, the check valve closes to prevent further loss, thus optimizing both reliability and lubricant conservation.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If lubricant pressure is increased to ensure adequate lubrication, then reliability is improved, but the risk of lubricant expulsion and system damage increases

Engineering Contradiction:

Improvelubrication adequacyVSAvoidpressure damage risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The check valve acts as a pressure-regulating intermediary that allows lubricant to pass when pressure is adequate but blocks further flow when pressure exceeds safe levels, preventing both insufficient lubrication and pressure-related damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The check valve is positioned to preemptively prevent lubricant expulsion before pressure damage can occur. By closing the flow path when pressure exceeds the threshold, it counteracts the harmful effect of excessive pressure before it can damage bearings or seals.

Inventive Principle:

Principle #9Preliminary anti-action

3Loss of substance

If a pressure relief mechanism is added to control lubricant flow, then lubricant loss is reduced, but device complexity increases

Engineering Contradiction:

Improvelubricant conservationVSAvoidlubrication system complexity

Core Design Contradiction:

Loss of substanceVSDevice complexity

Solution Approach 1:

The check valve is a passive, self-regulating component that automatically controls lubricant flow based on pressure differential without requiring external control systems. This minimizes the increase in device complexity while achieving effective lubricant conservation.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The check valve serves as a simple intermediary element that adds minimal complexity to the system. Its one-way flow control mechanism is straightforward in design and operation, providing pressure relief functionality without significantly complicating the overall lubrication system.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This solution prolongs the drill bit's operational life and reduces maintenance needs by maintaining sufficient lubrication levels and preventing lubricant expulsion, thereby enhancing drilling performance and extending the time between servicing.

Implementation Method 1

when lubricant pressure within the lubricant reservoir exceeds pressure of the lubricant in the lubricant chamber

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Implementation Method 2

whenever pressure in the lubricant reservoir exceeds pressure in the lubricant chamber

Methodology Applied

Scientific EffectPressure differential: Pressure Gradient

Data Source

PatentUS9194186B2Methods and system for lubrication pressure relief for a roller cone drill bit

Publication Date: 2015.11.24 HALLIBURTON ENERGY SERVICES INC

AI summary

According to one embodiment, the disclosure relates to a roller cone drill bit including a bit body having at least one support arm extending therefrom, a cone assembly containing bearings or retaining balls and rotatably mounted on a journal extending from each support arm, a lubricant reservoir disposed in each support arm, a lubricant chamber disposed in each support arm and fluidly coupled to the bearings or retaining balls, a bore disposed in each support arm to communicate lubricant between the lubricant reservoir and the lubricant chamber, and a pressure release mechanism disposed within the bore. The pressure release mechanism may be operable to relieve lubricant from the lubricant reservoir into the lubricant chamber when lubricant pressure within the lubricant reservoir exceeds pressure of the lubricant in the lubricant chamber. According to another embodiment, the disclosure relates to methods of relieving lubricant in such a bit.