Directional Wireline Core Drilling Device with Unjamming Mechanism
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Solution Overview
Problem
Conventional wireline core drilling devices fail to accurately determine key parameters such as strike and dip angles of fractures and bedding structures, and directional permeability of rock strata, leading to incomplete strata information and reduced drilling efficiency due to core jamming and fragmentation.
Innovation Solution
A multifunctional directional wireline core drilling device with a core unjamming mechanism and directional coring mechanism, featuring a sliding shaft sleeve, compression spring, suspension shaft, ball check valve, and electronic multi-point inclinometer, which allows for accurate measurement and recording of drilling azimuths and reduces core jamming by utilizing drilling fluid to clear obstructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wireline core drilling methods are used, then drilling operation is simple, but core jamming occurs frequently causing insufficient core recovery and reduced drilling efficiency
Solution Approach 1:
The patent applies preliminary action by installing the core unjamming mechanism before core drilling operations begin. The mechanism includes a suspension shaft with cutting edges that can be advanced into the core barrel to remove obstructions before they cause complete jamming. The ball check valve and compression spring are pre-positioned to enable automatic activation when core jamming occurs, eliminating the need for immediate manual intervention and maintaining continuous drilling efficiency.
Solution Approach 2:
The patent uses drilling fluid as an intermediary substance to address core jamming. The fluid flows through the core barrel and acts on the suspended core, reducing friction and facilitating core removal from the barrel. This intermediary approach allows the core to be extracted without mechanical contact that could cause further fragmentation, thereby improving core recovery rate while maintaining drilling efficiency.
2Measurement precision
If conventional wireline core drilling devices are used, then device structure is simple, but key parameters such as strike and dip angles of fractures and bedding structures cannot be accurately determined
Solution Approach 1:
The patent applies multi-functionality by integrating the directional coring mechanism into the existing core barrel assembly. The same core barrel that collects the core sample also houses the inclinometer and azimuth marker systems. This allows the device to simultaneously perform core collection, directional measurement, and azimuth marking functions, achieving accurate strike and dip angle measurement without proportionally increasing device complexity.
Solution Approach 2:
The patent uses nesting by placing the electronic multi-point inclinometer and azimuth marking components inside the core barrel structure. The inclinometer is housed within the core barrel, and the azimuth marking system is integrated into the same assembly. This nested arrangement allows multiple measurement functions to be incorporated without significantly increasing the external dimensions or overall complexity of the drilling device.
3Loss of information
If conventional wireline core drilling devices are used, then device structure is simple, but obtained strata information is incomplete due to core fragmentation
Solution Approach 1:
The patent applies extraction by removing the core from the core barrel using the suspension shaft mechanism before the core can fragment or become damaged. The suspension shaft with cutting edges extracts the core by cutting it free from the barrel, and the ball check valve system controls the extraction process to minimize mechanical stress on the core. This extraction approach preserves core integrity and ensures complete strata information is obtained without requiring complex external handling equipment.
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
Enables accurate recovery of stratum fracture data, improves core recovery, and enhances drilling efficiency by effectively addressing core jamming and fragmentation issues, providing reliable data for resource evaluations and geological exploration.
Implementation Method 1
a compression spring, wherein the compression spring is disposed around the suspension shaft
Implementation Method 2
a ball valve, wherein the ball valve is arranged in a ball valve seat at a lower end of the suspension shaft
Implementation Method 3
a ball valve, wherein the ball valve is arranged in a ball valve seat at a lower end of the suspension shaft
Implementation Method 4
an electronic multi-point inclinometer and a multi-point inclinometer holder, wherein there is a cavity in the multi-point inclinometer holder
Implementation Method 5
a water hole is formed in the sliding shaft sleeve, and a water hole corresponding to the water hole in the sliding shaft sleeve is formed in the suspension shaft
Data Source
AI summary
A multifunctional directional wireline core drilling device includes an outer assembly, an inner assembly, a core unjamming mechanism, and a directional coring mechanism. According to the present disclosure, wireline core drilling can be fulfilled; in addition, the directional coring mechanism can truly restore the strike and azimuth of a stratum facture by obtaining a core with an azimuth. By controlling the flow of drilling fluid during drilling, the core unjamming mechanism can effectively reduce core abrasion, generated due to jamming in the core barrel, during drilling, so that the core recovery of a fractured stratum prone to causing core jamming and the drilling efficiency are greatly improved.