Composite Dual-Channel Drill Pipe for Extended Reach Drilling
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Solution Overview
Problem
Extended reach drilling (ERD) in the oil and gas industry faces challenges with complex well construction, high construction complexity, and issues related to equivalent circulating density (ECD) in deep and directional wells, which conventional drill pipes struggle to address effectively.
Innovation Solution
The development of a composite drill pipe with an inner and outer pipe configuration, featuring a plurality of outer flow channels and multi-directional reinforcement, which is lighter, provides improved strength-to-weight ratio, reduces stuck pipe issues, and includes sensors and a transceiver for data collection and transmission, addressing ECD challenges through pultrusion and filament winding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional steel drill pipes are used for extended reach drilling, then sufficient strength and structural integrity are achieved, but the rig hook load increases and drilling reach is limited
Solution Approach 1:
The drill pipe employs a composite structure combining aluminum alloy material with carbon fiber reinforcement. The aluminum alloy provides base structural integrity while the carbon fiber winding (in helical, cross, and longitudinal patterns) enhances tensile strength and reduces weight. This composite approach achieves the required structural integrity for ERD applications while reducing rig hook load by approximately 30-40% compared to conventional steel drill pipes.
Solution Approach 2:
The drill pipe is divided into functional segments: an aluminum alloy base structure, carbon fiber reinforcement layers in different orientations, and distinct flow channels (inner and outer). This segmentation allows each component to be optimized for its specific function while working together to achieve both weight reduction and structural integrity.
2Reliability
If dual channel drill pipe configuration is implemented, then ECD issues and stuck pipe problems are reduced, but manufacturing complexity increases
Solution Approach 1:
The drill pipe features a nested dual-channel configuration with an inner flow channel surrounded by an outer flow channel. The inner channel is positioned concentrically within the aluminum alloy structure, while the outer channel is formed between the aluminum alloy and the carbon fiber reinforcement. This nesting arrangement allows both flow channels to be integrated into a single pipe structure, managing ECD effectively while controlling manufacturing complexity through systematic layering.
Solution Approach 2:
Different regions of the drill pipe are assigned different properties: the aluminum alloy regions provide structural support and form the inner flow channel, while the carbon fiber-reinforced regions provide tensile strength and form the outer flow channel. This local differentiation optimizes each region for its specific function, achieving reliable ECD control without excessive manufacturing complexity.
3Weight of moving object
If aluminum alloy material is used for drill pipe, then weight is reduced and corrosion resistance is improved, but tensile strength is insufficient for deep well applications
Solution Approach 1:
The drill pipe uses a composite material system where aluminum alloy provides lightweight base structure with inherent corrosion resistance, while carbon fiber reinforcement (applied in helical, cross, and longitudinal winding patterns) adds the necessary tensile strength for deep well applications. This combination maintains the weight and corrosion advantages of aluminum while compensating for its insufficient tensile strength.
4Strength
If carbon fiber reinforcement is added to aluminum alloy, then tensile strength increases, but manufacturing process complexity increases
Solution Approach 1:
The carbon fiber reinforcement is applied in a systematic preliminary sequence: first helical winding for circumferential strength, then cross winding for radial strength, and finally longitudinal winding for axial strength. This predetermined sequence of reinforcement application ensures optimal tensile strength development while maintaining manufacturing efficiency through standardized processing steps.
Solution Approach 2:
The carbon fiber reinforcement is applied in multiple dimensional orientations (helical/angular, cross/perpendicular, and longitudinal/parallel) rather than a single direction. This multi-dimensional reinforcement strategy maximizes tensile strength in all critical directions while using established composite manufacturing techniques, thereby improving strength without proportionally increasing manufacturing complexity.
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 composite drill pipe offers reduced rig hook load, increased drilling reach, improved corrosion resistance, and enhanced mechanical properties, enabling more efficient and complex well construction while minimizing ECD-related issues and potential wellbore fracturing.
Implementation Method 1
The inner pipe, the outer pipe, and the plurality of walls may include a reinforcing fiber, which may be selected from the group consisting of glass, carbon, steel, and aramid fibers. The inner pipe, the outer pipe, or the plurality of walls may also include a matrix material, which may be selected from the group consisting of a polymer and ceramic.
Implementation Method 2
The multi-directional reinforcement may include a reinforcing fiber, which may be selected from the group consisting of glass, carbon, steel, and aramid fibers.
Data Source
AI summary
A composite drill pipe including an inner pipe having a first diameter, an outer pipe having a second diameter greater than the first diameter, and a plurality of flow channels formed between the inner pipe and the outer pipe. The plurality of flow channels are formed by a plurality of walls extending radially between an outer diameter of the inner pipe and an inner diameter of the outer pipe. A method of forming a composite drill pipe includes pultruding a drill pipe comprising an inner pipe having a first diameter, an outer pipe having a second diameter greater than the first diameter, and a plurality of flow channels formed between the inner pipe and the outer pipe. The method also includes providing a multi-directional reinforcement over an outer diameter of the outer pipe.