Three-Stage Adjustable Downhole Choke with Pressure Measurement
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Solution Overview
Problem
Current downhole chokes lack adjustable orifice diameters, requiring frequent replacement and labor-intensive pressure measurements, leading to high costs and operational inefficiencies in natural gas production.
Innovation Solution
A preset three-stage adjustable downhole choke with choking and pressure measurement functions, featuring an intake assembly for filtration, an electrically-controlled telescopic assembly for positioning, and a three-stage choking assembly with adjustable orifice diameters, enabling convenient installation, measurement, and intelligent control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-stage downhole choke is used, then the device complexity is low, but the productivity is reduced due to the need for multiple chokes in series to meet production needs
Solution Approach 1:
The downhole choke is divided into multiple independent control stages (first-stage, second-stage, third-stage control chokes) arranged in series within a single device. Each stage can be independently adjusted to provide different choking effects, enabling a single multi-stage choke to replace multiple single-stage chokes and satisfy varying production requirements at different depths.
Solution Approach 2:
The multi-stage downhole choke integrates multiple choking functions into a single device, allowing it to perform the roles of multiple single-stage chokes simultaneously. This universal design enables one device to meet diverse production needs that would otherwise require several separate devices installed in series.
2Manufacturing precision
If the orifice diameter of the control choke is fixed, then the manufacturing precision is high, but the adaptability is reduced requiring frequent replacement of chokes
Solution Approach 1:
The control choke is designed with an adjustable orifice diameter that can be dynamically changed after installation. The adjustable component allows the orifice size to be modified according to actual production conditions, transforming a static fixed-orifice design into a dynamic adjustable one, thereby improving adaptability while maintaining precise control over the orifice diameter.
Solution Approach 2:
The orifice diameter parameter of the control choke is made changeable through the adjustable component. By allowing the orifice diameter to be adjusted to different values, the system can adapt to varying production requirements without requiring manufacturing of multiple fixed-orifice chokes, thus improving versatility while preserving manufacturing precision for each specific orifice size.
3Measurement precision
If pressure measurement is performed by lowering a pressure gauge after fishing out the choke, then the measurement precision is high, but the loss of time and labor increases
Solution Approach 1:
The downhole choke is equipped with an integrated pressure measurement function that enables it to measure its own operating parameters directly at the downhole location. This self-measurement capability eliminates the need to fish out the choke and lower separate pressure gauges, allowing continuous monitoring of downhole pressure without additional time loss or labor while maintaining measurement precision.
Solution Approach 2:
The pressure measurement function is merged with the control choke into an integrated device. By combining the choking function and pressure measurement function in one unit, the system eliminates the need for separate measurement operations, thereby reducing time and labor losses while maintaining accurate downhole pressure measurement capability.
Data Source
AI summary
A preset three-stage adjustable downhole choke with choking and pressure measurement functions includes an intake assembly for natural gas filtration, an electrically-controlled telescopic assembly for positioning and clamping the downhole choke with a prefabricated seating nipple, and a three-stage choking assembly for natural gas choking and depressurization. The intake assembly, the electrically-controlled telescopic assembly, and the three-stage choking assembly are sequentially communicated from bottom to top. A first-stage control choke, a second-stage adjustable control choke, and a third-stage control choke are sequentially provided in a gas passage of the three-stage choking assembly from bottom to top. The preset three-stage adjustable downhole choke features convenient installation and removal, three-stage choking and depressurization, and an adjustable orifice diameter of a control choke, and can achieve different choking and depressurization effects.