Production String Jet-Hole Structure for Liquid-Unloading Gas Wells
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Solution Overview
Problem
Existing methods for improving the flow rate and gas carrying capacity of oil and gas wells, particularly natural gas wells, are limited, as they either require additional energy or occupy the central passage, leading to liquid slippage and reduced recovery rates.
Innovation Solution
The implementation of an anti-skid degassing hole structure with a jet hole rotary block and anti-skid liquid accumulators in the production string, which accelerates gas flow and uses the Bernoulli principle to form a supporting force, combined with an anti-skid liquid accumulator to prevent liquid slippage and enhance gas-liquid mixture flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gas lift technology is used to reduce liquid density, then the liquid carrying capacity is improved, but the pressure difference required for valve operation is not sufficient in natural gas wells
Solution Approach 1:
The patent changes the operational parameter from pressure-difference-controlled valve opening to temperature-controlled wax melting. The wax coating melts at a specific temperature threshold, automatically opening the flow channel without requiring sufficient pressure difference, thus resolving the contradiction between improving liquid carrying capacity and insufficient pressure difference in natural gas wells.
2Reliability
If one-way valves are installed to prevent liquid column slippage, then liquid slippage is prevented, but the central passage is occupied making it impossible to install other downhole tools
Solution Approach 1:
The patent extracts the flow control function from the central passage by placing the wax-based flow control structure on the inner wall of the production string. This allows the central passage to remain open and accessible for other downhole tools while the wax coating on the wall surface prevents liquid column slippage, resolving the contradiction between preventing liquid slippage and occupying the central passage.
3Quantity of substance
If gas is introduced through straight holes to reduce gas-liquid mixture density, then density reduction is achieved, but the flow rate of gas-liquid mixture is not increased
Solution Approach 1:
The patent introduces a rotatable jet hole block that can rotate under gas flow pressure, dynamically changing the orientation and opening of jet holes. This dynamic adjustment optimizes the gas injection pattern to not only reduce gas-liquid mixture density but also increase the flow rate by creating more effective gas-liquid interaction and upward momentum, resolving the contradiction between density reduction and flow rate increase.
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 improves the flow rate and gas carrying capacity of oil and gas wells without occupying the central passage, effectively preventing liquid accumulation and enhancing recovery rates, applicable to both oil and gas wells.
Implementation Method 1
accelerates gas flow and uses the Bernoulli principle to form a supporting force
Implementation Method 2
a negative pressure zone is formed near the jet hole A of the production string, and the flow rate of the gas-liquid mixture in the production string is improved
Data Source
AI summary
The present application relates to a liquid accumulation-free production and drainage system for oil and gas well, including a casing and a production string, and the casing is arranged in the oil and gas well, and the bottom of the casing is inserted below the oil and gas liquid level, the production string is arranged in the casing, so that an annular gap is formed between the casings and the production string. The production string is formed by connecting a plurality of oil and gas pipes, a plurality of anti-skid liquid accumulators and a plurality of anti-skid gas injectors end to end, one of the anti-skid liquid accumulators or one of the anti-skid gas injectors is arranged at intervals of several of the oil and gas pipes and and one of the anti-skid gas injectors is arranged at intervals of several of the anti-skid liquid accumulators.