Multi-Section Storage Well Drilling for Gas-Liquid Separation
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Solution Overview
Problem
Existing methods for deep geological storage of gas-liquid mixed fluids face challenges such as an unreasonable well structure, sealing issues, and gas-liquid separation problems, particularly in the context of combined storage of wastewater containing waste gas and liquid.
Innovation Solution
A drilling method involving multiple well casings with specific configurations and support rods to facilitate gas-liquid separation and sealing, including vent holes, drain holes, and a helical flow tube for centrifugal separation, supported by a system of support rods to maintain stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate geological storage of gas or liquid is implemented, then the sealing and degradation properties of the deep geological environment are utilized to prevent fluid participation in material cycles, but there are few studies on gas-liquid mixed fluid or combined storage, leading to unreasonable well structure and sealing problems
Solution Approach 1:
The storage well is divided into multiple sections with different casings (first section well casing, second section well casing, third section well casing) corresponding to different storage layers. Each section has specialized functions: the first section handles gas storage with vent holes, the second section handles liquid storage with drain holes, and the third section provides additional sealing. This segmentation allows each section to be optimized for its specific function while maintaining overall system reliability.
Solution Approach 2:
The well structure employs a nested configuration where the second section well casing is placed inside the first section well casing, and the third section well casing is placed inside the second section well casing. This nested arrangement allows multiple storage functions to be integrated within a single well structure, reducing the need for separate wells while maintaining specialized sealing for each fluid type.
2Adaptability or versatility
If gas-liquid combined storage is attempted, then research on subsurface migration and diffusion mechanisms can be applied, but gas-liquid separation becomes a problem that requires specialized components
Solution Approach 1:
The well structure separates gas and liquid storage functions into different sections. The first section well casing is dedicated to gas storage with vent holes for gas discharge, while the second section well casing is dedicated to liquid storage with drain holes for liquid discharge. This segmentation eliminates the need for complex gas-liquid separation components by preventing mixing at the source.
Solution Approach 2:
The third section well casing acts as an intermediary structure that provides additional sealing and support between the gas and liquid storage sections. It includes a gas-liquid separation component that facilitates controlled interaction between gas and liquid phases while maintaining their separate storage zones, enabling combined storage capability without requiring complex separation systems.
3Reliability
If multiple well casings are used for different storage layers, then gas and liquid can be stored separately, but the structure becomes more complex requiring multiple drilling operations
Solution Approach 1:
The drilling method employs preliminary actions by first drilling to the gas storage layer and installing the first section well casing and second section well casing before drilling to the liquid storage layer. The third section well casing is then installed inside the second section. This sequential installation with preliminary positioning of inner casings allows the complex multi-section structure to be built systematically, reducing overall drilling time compared to attempting to install all sections simultaneously or requiring multiple separate drilling operations.
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
Enables efficient and stable gas-liquid separation and storage in underground formations, reducing drilling costs and ensuring the integrity of the storage well structure.
Implementation Method 1
a helical flow tube for centrifugal separation
Implementation Method 2
a sidewall of a second section sub-well casing, corresponding to a gas storage layer, of the multiple segments of second section sub-well casings is uniformly provided with multiple vent holes for venting gas injected from the second section well casing into the gas storage layer
Implementation Method 3
a sidewall of one, corresponding to a liquid storage layer, of the multiple segments of third section sub-well casings is uniformly provided with multiple drain holes for draining the liquid injected from the third section well casing into the liquid storage layer
Data Source
AI summary
Provided is a drilling method for a storage well for liquid-gas two-phase combined geological storage, including the following steps: drilling down from a ground to the bottom of a potable aquifer, and installing a first section wellbore; dividing a second section wellbore into multiple segments of second section sub-wellbores, arranging multiple first bases on an inner wall in advance, forming an vent hole in a sidewall of the second section sub-wellbore corresponding to a gas storage layer, and closing a bottom surface of the second section sub-wellbore at the bottom, with a drill-through hole at the center; drilling down to the bottom of the gas storage layer, and installing the second section wellbore; dividing a third section wellbore into multiple segments of third section sub-wellbores, and arranging multiple second bases on an outer wall in advance.