Side Pocket Mandrel for Controlled Chemical Injection
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Solution Overview
Problem
Current methods of chemical injection for treating scale in hydrocarbon producing wells are difficult to control, costly, and can cause formation damage, leading to reduced production and potential well abandonment.
Innovation Solution
A downhole injection system using a side pocket mandrel that houses a removable, pressurized chemical vessel, allowing for controlled and targeted injection of chemicals directly into the production tubing at known rates and near downhole temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical injection methods (e.g., bullheading) are used, then chemical injection can be performed, but the injection is difficult to control or meter and results in formation damage
Solution Approach 1:
The injection system is segmented into distinct functional components: a chemical vessel for storage, a metering device for precise dosage control, and an injection mechanism for targeted delivery. This segmentation allows each component to be optimized independently, enabling precise control of chemical injection rates and minimizing formation damage through controlled dosing.
Solution Approach 2:
The system incorporates feedback mechanisms through the metering device that monitors and regulates chemical flow rates in real-time. This feedback control ensures that chemicals are injected at predetermined rates, preventing over-injection that could cause formation damage while maintaining effective scale treatment.
2Reliability
If conventional chemical injection methods are used, then chemical injection can be performed, but large amounts of specialized equipment and personnel are required
Solution Approach 1:
The patent merges multiple functions into a single integrated downhole tool: the chemical vessel, metering device, injection mechanism, and triggering system are combined into one compact assembly. This consolidation eliminates the need for separate surface equipment and multiple personnel operations, reducing overall system complexity while maintaining reliable chemical injection capability.
Solution Approach 2:
The system is designed to be self-contained and self-operating once deployed. The chemical vessel stores sufficient chemical to complete the treatment, the metering device automatically regulates flow rates, and the injection is triggered by downhole conditions or remote signal, eliminating the need for continuous surface equipment support or personnel intervention.
3Productivity
If scale formation is left untreated, then production can continue temporarily, but scale coats tubulars and adheres to formation reservoir, resulting in reduced production and potential well abandonment
Solution Approach 1:
The system performs preliminary chemical injection treatment by delivering scale inhibitor chemicals to the wellbore and formation ahead of significant scale buildup. This preventive action maintains tubular flow paths and formation permeability before they are compromised by scale, ensuring long-term production sustainability rather than merely delaying the inevitable decline.
Data Source
AI summary
A well system includes a wellbore, production tubing extended into the wellbore and thereby defining an annulus between the production tubing and an inner wall of the wellbore, and a side pocket mandrel interposing upper and lower sections of the production tubing and including a body that provides a lateral projection extending radially outward from the body, and a pocket defined within the lateral projection. The well system further includes a chemical vessel receivable within the pocket and operable to discharge an injection fluid stored within the chemical vessel into the production tubing via one or more apertures provided in the chemical vessel.