Adjustable Servo Valve Pulser for Deep Well Data Transmission
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Solution Overview
Problem
Existing pulser technologies in oil drilling face issues such as clogging, lack of proper lubrication, and weak pressure pulses, particularly in deep wells, making it challenging to efficiently and reliably transmit measurement data from the bottom of a bore hole to the surface.
Innovation Solution
A pulser device with a tubular housing, pressure compensation piston, electric motor, servo valve, and metal screens that allow drilling fluid to enter, featuring a unique two-part servo valve configuration with adjustable orifice and poppet sizes to generate strong pressure pulses, and a method to select the appropriate orifice and poppet diameter based on the drilling depth and required pulse amplitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing pulser technologies are used to transmit data from the bottom of the well, then data transmission is achieved, but the pressure pulses are weak and unreliable, especially in deep wells
Solution Approach 1:
The servo valve is made adjustable with variable orifice size, allowing the pulser to dynamically adapt pressure pulse strength to match drilling depth and formation conditions. This dynamic adjustment capability enables strong, reliable pulses in deep wells while maintaining optimal performance across varying operational conditions.
Solution Approach 2:
The system changes the physical parameter of orifice diameter to control pressure pulse characteristics. By providing multiple orifice size options and allowing adjustment, the pulser can optimize pressure pulse strength for different well depths and transmission requirements, directly addressing the weakness of fixed-parameter existing technologies.
2Force
If smaller orifices are used in the servo valve, then the pressure pulses can be stronger, but the orifice is more prone to clogging
Solution Approach 1:
The adjustable servo valve allows dynamic selection of orifice size based on drilling conditions. When clogging is a concern, larger orifices can be selected or adjusted to maintain flow, while still capable of producing strong pulses when smaller orifices are appropriate. This adaptability resolves the trade-off between pulse strength and clogging resistance.
Solution Approach 2:
By changing the orifice diameter parameter, the system can balance between generating strong pressure pulses and preventing clogging. The ability to select or adjust orifice size allows optimization for specific drilling conditions, preventing the reliability issue of clogging while maintaining pulse strength when needed.
3Reliability
If larger orifices are used in the servo valve, then the system is less prone to clogging, but the pressure pulses become weaker
Solution Approach 1:
The adjustable servo valve enables dynamic adaptation of orifice size to operational requirements. In conditions where clogging is a primary concern, larger orifices are selected. When strong pulses are the priority and clogging risk is low, smaller orifices are used. This dynamic capability resolves the fixed trade-off in existing technologies.
Solution Approach 2:
The system changes the orifice diameter parameter to balance clogging resistance and pulse strength. By providing a range of orifice sizes and adjustability, the system can optimize for either parameter depending on drilling conditions, eliminating the need to accept the compromise inherent in fixed-orifice designs.
4Ease of manufacture
If fixed-size orifices are used in the servo valve, then the device is simpler to manufacture, but the pulser cannot adapt to different drilling depths and conditions
Solution Approach 1:
The servo valve is segmented into separate components (valve body, orifice inserts, poppet) that can be manufactured independently using standard processes. This modular segmentation maintains manufacturing simplicity while allowing different orifice size inserts to be swapped or adjusted, providing adaptability to different drilling conditions without complicating the base manufacturing process.
Solution Approach 2:
The servo valve is designed with universal adaptability through adjustable orifice size and interchangeable components. A single valve design can serve multiple drilling depths and conditions by changing the orifice parameter, eliminating the need for multiple fixed-size valve designs and maintaining manufacturing efficiency while achieving versatility.
5Adaptability or versatility
If adjustable servo valves with variable orifice sizes are used, then the pulser can generate optimal pressure pulses for different depths, but the device complexity increases
Solution Approach 1:
The adjustable servo valve introduces dynamic adaptability through controlled variation of orifice size. While this increases device complexity compared to fixed-orifice designs, the complexity is managed through modular architecture and standardized adjustment mechanisms, enabling optimal pressure pulse generation across different drilling depths and conditions.
Solution Approach 2:
The system changes the orifice diameter parameter to adapt to different drilling depths. This parameter variation capability increases device complexity but is implemented through practical adjustment mechanisms that balance the need for adaptability with acceptable complexity levels, enabling optimization of pressure pulses for various operational conditions.
6Length of stationary object
If the pulser operates in deep wells, then data transmission is achieved from greater depths, but the pressure pulses become weaker due to fluid column pressure
Solution Approach 1:
The adjustable orifice size in the servo valve allows parameter changes to compensate for the weakening effect of the fluid column in deep wells. By selecting or adjusting appropriate orifice sizes, the pulser can generate stronger pressure pulses that overcome the dampening effect of the deeper fluid column, maintaining adequate pulse amplitude for reliable surface detection.
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 solution enables reliable and efficient transmission of pressure pulses through the drilling fluid, effectively overcoming clogging and weak pulse issues, ensuring accurate data transmission from the bottom of the bore hole to the surface, even in deep wells.
Implementation Method 1
a valve mechanism in the pulser that opens and closes an orifice to generate pressure pulses in the drilling fluid that propagates through a mud column to a pressure sensor on the surface
Implementation Method 2
one or more metal screens affixed to a surface of the distal portion of the tubular housing, configured to allow the drilling fluid to enter the tubular housing
Implementation Method 3
a pressure compensation piston separating the tubular housing into a proximal portion and a distal portion
Data Source
AI summary
A pulser for generating pressure pulses propagating through a column of drilling fluid in the drill string to the surface during drilling. The pulser may include a screen in the surface of a tubular housing to permit mud from the mud stream to enter into the pulser; an adjustable servo valve configured to receive the mud and including a removable servo poppet and a removable servo orifice member positioned in the tubular housing, wherein the adjustable servo valve is configured to allow the removable servo poppet and the removable servo orifice member to be replaced by another removable servo poppet and another removable servo orifice member to alter an inner diameter of an orifice of the adjustable servo valve to accommodate drilling conditions to increase a performance of the pulser generating pressure pulses for the mud stream returning to the surface.