Impact Jar Delay and Activation Feedback for Stuck Tool Retrieval

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Drilling operations in deeper and more complex wellbores face challenges with tools becoming stuck, leading to equipment damage and operational disruptions, and existing impact jars lack effective activation control and feedback mechanisms.

Innovation Solution

An impact jar apparatus with a dynamic and static portion, featuring a hydraulic manifold for adjustable delay, an activation indicator using a wire coil and magnets for real-time surface confirmation, a relatch assist, and a shock absorber to manage axial shock, enhancing operational control and safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an impact jar is triggered by tension load to dislodge stuck downhole apparatus, then the jar can free the stuck portion, but inadvertent activation may occur causing equipment damage and operational disruption

Engineering Contradiction:

Improvejar activation controlVSAvoidinadvertent activation damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a delay mechanism that activates the jar after a predetermined time period following tension load application. This preliminary delay allows operators to verify that the tension load was intentionally applied and not caused by equipment failure or wellbore conditions, thereby preventing inadvertent activation while still enabling the jar to dislodge stuck apparatus when properly triggered

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent incorporates an activation indicator that provides real-time feedback to surface operators confirming whether the jar has activated. This feedback mechanism allows operators to monitor the downhole condition and verify proper jar function, preventing unintended activation by ensuring the trigger conditions are met before the jar releases

Inventive Principle:

Principle #23Feedback

2Loss of information

If real-time confirmation of jar activation is implemented, then operational control is improved, but device complexity increases

Engineering Contradiction:

Improveactivation confirmation feedbackVSAvoidapparatus structure

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent replaces complex electronic or hydraulic feedback systems with a simple magnetic field-based activation indicator. Magnets and a Hall effect sensor detect the jar's activation state and transmit this information to surface operators through existing wireline or drill pipe telemetry, providing real-time confirmation without adding significant mechanical complexity to the downhole apparatus

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The activation indicator utilizes the jar's own movement and magnetic field changes during activation to generate the feedback signal. The system automatically detects and reports its own activation state without requiring external sensors or complex monitoring equipment, simplifying the overall device architecture while maintaining real-time information transmission

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If shock absorber is added to manage axial shock, then equipment protection is improved, but device complexity increases

Engineering Contradiction:

Improveaxial shock damageVSAvoidapparatus structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent incorporates a shock absorber that is pre-positioned within the jar assembly to cushion axial shock before it can damage sensitive downhole equipment. The shock absorber is integrated into the jar's structural design, providing protective functionality without requiring additional separate components or complex mounting arrangements

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 apparatus provides controlled impact activation, reduces inadvertent jarring, and ensures real-time surface confirmation, minimizing equipment damage and operational costs while improving retrieval efficiency.

Implementation Method 1

The magnets are carried by the dynamic portion and generate a magnetic field such that a voltage pulse is generated in the wire coil in response to the magnetic field passing by the wire coil upon activation of the impact jar apparatus

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12497851B2Impact jar delay, activation indicator, shock absorber, and relatch assist

Publication Date: 2025.12.16 WEATHERFORD TECHNOLOGY HOLDINGS LLC

AI summary

An impact jar apparatus including a dynamic portion connectable to an upper tool string portion, a static portion connectable to a lower tool string portion, and a hydraulic manifold, an activation indicator, a relatch assist, and/or a shock absorber. The hydraulic manifold fluidly communicates with an annulus between the dynamic and static portions. The hydraulic manifold adjusts a delay between application of a trigger tension and consequent activation of the impact jar apparatus. The activation indicator, including a wire coil in the static portion and magnets carried by the dynamic portion, generates a magnetic field whereby a voltage pulse is generated in the wire coil in response to the magnetic field passing the wire coil upon activation of the impact jar apparatus. The relatch assist urges the dynamic and static portions toward a latched position. The shock absorber absorbs axial shock generated by activation of the impact jar apparatus.