Drill Pipe Casing Collar Locator Using Magnetic Detection
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Solution Overview
Problem
Conventional techniques for locating casing collars in oilfield settings are inefficient, time-consuming, and costly, often requiring additional service providers and equipment for wireline tool deployment.
Innovation Solution
A drill pipe sub-assembly with a detection apparatus that includes a bypass port, an annular sleeve, magnetized coils generating an electromagnetic field, and a weight loss detection device, which allows for simultaneous detection and location of casing collars during drill string deployment, eliminating the need for separate wireline tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireline logs are used to locate casing collars, then measurement capability is achieved, but service provider costs and operational time increase significantly
Solution Approach 1:
The patent combines the casing collar detection function with the drill string deployment operation itself. The drill string is equipped with a detection apparatus that includes magnetized coils and a bypass port system, allowing collar location to be detected during the normal running process without requiring a separate wireline tool deployment. This merging of functions eliminates the need for additional service providers and reduces operational time.
Solution Approach 2:
The drill string serves multiple functions simultaneously: it performs the mechanical task of deploying equipment into the wellbore while also functioning as a detection platform for locating casing collars. The detection apparatus integrated into the drill string enables it to perform both deployment and detection roles, eliminating the need for specialized wireline tools and reducing overall operational complexity.
2Measurement precision
If wireline tools are deployed to detect casing collars, then detection capability is achieved, but additional equipment and service providers are required
Solution Approach 1:
The detection apparatus is integrated directly into the drill string, combining the deployment function and detection function into a single system. This eliminates the need for separate wireline tools and reduces the number of equipment types required. The drill string itself becomes the detection platform through the integrated magnetized coils and bypass port system.
Solution Approach 2:
The drill string is designed to perform multiple functions: mechanical deployment of equipment and electromagnetic detection of casing collars. This multi-functionality reduces the overall equipment complexity by eliminating the need for specialized detection tools, as the drill string itself performs both roles.
3Measurement precision
If conventional detection methods are used, then casing collar location can be determined, but operational efficiency decreases due to additional service providers
Solution Approach 1:
The drill string performs self-detection of casing collar locations through its integrated detection apparatus. The system uses its own magnetized coils and bypass port mechanism to detect collars during deployment, eliminating the need for external service providers to run separate detection tools. This self-service capability significantly improves operational efficiency.
Solution Approach 2:
The detection function is merged with the deployment operation, allowing both tasks to be performed simultaneously by the same equipment. This integration eliminates the sequential nature of conventional methods where deployment and detection are separate operations requiring different service providers, thereby improving productivity.
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 reduces costs and rig time by enabling accurate casing collar detection while running a drill string, applicable to various well orientations without the need for additional equipment or fluid pumping, enhancing operational efficiency.
Implementation Method 1
two magnetized coils which interact to generate an electromagnetic field
Implementation Method 2
a predetermined voltage generated by the magnetized coils when the coils displace past a casing collar
Implementation Method 3
a weight loss detection device which detects a loss of weight in the drill pipe segment after closing of the bypass port
Data Source
AI summary
A system for locating a casing collar includes a drill pipe sub-assembly with a drill pipe segment and detection apparatus. The detection apparatus includes a bypass port disposed in a wall of the drill pipe segment; an annular sleeve which directs fluid through the bypass port and into a drill pipe segment interior portion; an actuator which opens and closes the bypass port; and two magnetized coils which generate an electromagnetic field. The actuator closes the bypass port in response to a predetermined voltage generated by the magnetized coils when they displace past a casing collar. Also included are a weight loss detection device which detects a loss of weight in the drill pipe segment, and a depth determination device which determines a depth of the casing collar, based on detected loss of weight. Also disclosed and described are a related method and drill pipe sub-assembly.