Liner With Selective Ports And Treatment String Assembly
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Solution Overview
Problem
Current wellbore fluid treatment methods require frequent tripping in and out of the wellbore, which is time-consuming and costly, and often fail to efficiently treat the wellbore without causing annular fluid migration and cementing issues.
Innovation Solution
A wellbore treatment apparatus and method utilizing a liner with selectively openable ports and a treatment string assembly that includes a tubing string with a fluid conduit and an annular seal, allowing for controlled fluid communication between the annulus and the wellbore, enabling efficient treatment without tripping, by positioning the liner and treatment string to create isolated annular spaces and using a port-opening tool to manage fluid flow through the ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional wellbore treatment methods are used, then fluid treatment can be applied, but frequent tripping in and out of the wellbore is required which increases time and cost
Solution Approach 1:
The liner is divided into multiple segments with selective ports at different intervals along its length. This segmentation allows treatment fluid to be introduced at multiple locations simultaneously, enabling treatment of multiple wellbore intervals in a single operation without requiring repeated tripping to access different zones.
Solution Approach 2:
The treatment string assembly is nested within the liner's inner bore. The treatment string includes a tubing string with a fluid conduit that is positioned within the liner, creating a nested configuration that allows fluid to be conveyed through the liner wall ports without requiring the treatment string to be tripped in and out.
2Productivity
If frequent tripping is performed to treat different wellbore intervals, then comprehensive treatment can be achieved, but operational cost increases
Solution Approach 1:
The liner is divided into multiple segments with selective ports at different intervals along its length. This segmentation allows treatment fluid to be introduced at multiple locations simultaneously, enabling treatment of multiple wellbore intervals in a single operation without requiring repeated tripping to access different zones.
Solution Approach 2:
The treatment string assembly remains continuously positioned within the liner during the treatment operation. The fluid conduit continuously conveys treatment fluid through the liner walls to multiple intervals simultaneously, eliminating the need to interrupt the operation for tripping and restoring the treatment string.
3Productivity
If ports are opened for fluid treatment, then fluid can be pumped into the wellbore, but annular fluid migration and cementing issues occur
Solution Approach 1:
The liner includes selective ports at specific locations along its length, allowing fluid treatment to be applied locally at targeted intervals rather than requiring open ports throughout the entire liner. This localized approach prevents unwanted annular fluid migration in sections where treatment is not intended.
Solution Approach 2:
The treatment string assembly acts as an intermediary component that controls fluid flow from the surface through the liner ports into the wellbore. The annular seal on the treatment string provides a barrier that prevents uncontrolled fluid migration in the annulus between the liner and wellbore wall.
4Productivity
If multiple ports are used for simultaneous treatment, then treatment efficiency improves, but device complexity increases
Solution Approach 1:
The liner is designed as a multi-functional component that provides both structural support and fluid delivery capabilities through its integrated ports. The treatment string assembly similarly serves multiple functions including positioning, sealing, and fluid conveyance, reducing the need for separate specialized components for each function.
Data Source
AI summary
A method for wellbore treatment includes running a liner into a wellbore, the liner including a wall, an inner bore defined by the wall, a first port through the wall, a second port though the wall spaced axially from the first port, a first removable closure for the first port and a second removable closure for the second port; positioning the liner in an open hole section of the wellbore to create an annulus between the liner and a portion of the wellbore wall and with the second port downhole of the first port; inserting a treatment string assembly into the liner, the treatment string assembly including a tubing string and an annular seal about the tubing string and being insertable into the inner bore of the liner; setting the annular seal to create a seal between the tubing string and the liner downhole of the second port; and while the first port is closed to fluid flow therethrough, pumping wellbore treatment fluid into an annular area between the tubing string and the liner such that the fluid passes through the second port and into the annulus to treat the open hole section of the wellbore adjacent the second port. The treatment string assembly may further include a port-opening tool and a fluid communication port permitting fluid communication between the tubing string outer surface and a fluid conduit through the tubing string adjacent an upper side of the annular seal.