Downhole Sand Gas Separation System for Rod Pump Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The operating life of rod pumps in hydrocarbon production is reduced due to the presence of sand and gas in production fluids, and existing technologies are inadequate in effectively separating these from wellbore fluids before they are pumped to the surface.
Innovation Solution
A sand and gas separation system comprising an upper separator for gas separation and a lower separator for sand separation, coupled together, which includes a gas plug and a cyclone housing with helically arranged fins to create a vortex for centrifugal separation, allowing sand to be funneled into a tailpipe and gas to be contained in a gas separation annulus within the upper separator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sand and gas are present in production fluid, then the rod pump can pump fluid to surface, but the operating life of the rod pump is significantly reduced
Solution Approach 1:
The separation system is divided into two distinct functional segments: a lower separator for sand removal and an upper separator for gas removal. This segmentation allows each component to specialize in removing one type of harmful substance, thereby effectively protecting the rod pump from both sand and gas without requiring a single complex separator that would be less efficient at handling both substances simultaneously.
Solution Approach 2:
The separation system performs preliminary removal of sand and gas from the production fluid before the fluid enters the rod pump. By implementing this preliminary action, the harmful substances are eliminated in advance, preventing them from causing wear and operational issues during the pump's normal operation, thus extending the pump's operating life.
2Reliability
If existing separation technologies are used, then some sand and gas removal is achieved, but the separation is inadequate and sand and gas still affect pump operation
Solution Approach 1:
The patent merges the sand separation function and gas separation function into a single integrated downhole separation system. The lower separator and upper separator are combined in a vertical arrangement within the production string, allowing both separation functions to operate simultaneously in one location. This merging provides comprehensive separation effectiveness while avoiding the complexity of multiple separate systems or post-pump separation equipment.
Solution Approach 2:
The separation system employs a nested structure where the lower separator and upper separator are arranged vertically one above the other within the production string. The inner tube of the upper separator is positioned within the housing of the lower separator, creating a compact nested configuration that maximizes separation effectiveness within the constrained downhole space.
3Productivity
If sand is not separated, then the fluid can flow freely, but sand causes wear and reduces pump efficiency
Solution Approach 1:
The lower separator extracts sand particles from the production fluid through centrifugal separation using a spinny separator with helically arranged fins. This extraction process removes the harmful sand component while allowing the cleaned fluid to continue flowing freely to the rod pump, thereby maintaining productivity while eliminating sand-induced wear and efficiency loss.
4Productivity
If gas is not separated, then the fluid can be pumped continuously, but gas accumulation reduces pump performance and can cause operational issues
Solution Approach 1:
The upper separator acts as an intermediary device between the lower separator and the rod pump. It receives desanded fluid from the lower separator, separates gas from the liquid phase using a gas plug and gas separation annulus, and delivers degassed fluid to the rod pump. This intermediary separation ensures continuous pumping capability while preventing gas accumulation that would otherwise harm pump performance.
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
Effectively separates sand and gas from wellbore fluids, extending the operational life of rod pumps by ensuring that only desanded and degassed fluids are pumped to the surface, thereby reducing wear and increasing production efficiency.
Implementation Method 1
a lower separator configured to separate out sand from wellbore fluids; helically arranged fins to create a vortex for centrifugal separation
Implementation Method 2
cyclone housing with helically arranged fins to create a vortex for centrifugal separation
Implementation Method 3
an upper separator configured to separate out gas from wellbore fluids; a gas plug disposed in the top sub, wherein the inner tube is coupled to the gas plug; and a gas separation annulus between the inner surface of the top sub and the outer surface of the inner tube
Implementation Method 4
a tailpipe coupled to the lower end of the separator through which sand separated out by the lower separator flows into
Data Source
Figure 1~2
AI summary
A sand and gas separation system for use with a rod pump. The system comprises an upper separator configured to separate out gas from wellbore fluids prior to flowing into the rod pump. The system further comprises a lower separator configured to separate out sand from wellbore fluids prior to flowing into the upper separator. The upper and lower separators are coupled together by a mechanical coupling.