Sliding Sleeve With Erosion-Resistant Ring For Multi-Stage Fracturing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional sliding sleeves used in oil and gas well completion and reservoir stimulation face challenges in multi-stage fracturing, including difficulty in opening stages sequentially and ensuring effective sealing to prevent blow-by at upper and lower ends, leading to potential failure and reduced efficiency.
Innovation Solution
A new sliding sleeve design featuring an upper connector, lower connector, outer housing, inner sleeve, and shear pin, with erosion-resistant rings, sealing rubber barrels, and dissolvable structures, along with specific open/close mechanisms and gap configurations to enhance erosion resistance, sealing, and ease of operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sliding sleeves are connected in sequence for multi-stage stimulation, then the number of fracturing stages can be increased, but the difficulty of opening sleeves stage by stage increases and sealing reliability deteriorates
Solution Approach 1:
The sliding sleeve is divided into multiple independent sealing units, each with its own sealing rubber barrel and sealing cavity. This segmentation allows each stage to be sealed independently, ensuring that sealing failure in one stage does not affect other stages, thereby maintaining high reliability across multiple fracturing stages.
Solution Approach 2:
The sealing rubber barrel is nested within the sealing cavity, forming a multi-layer sealing structure. The sealing rubber barrel can expand radially to contact the sealing cavity wall, creating reliable sealing. This nested design allows the sealing mechanism to be compact while maintaining effective sealing across multiple stages.
2Device complexity
If traditional sliding sleeve structures are used, then the device complexity is low, but erosion resistance deteriorates and tool life is reduced
Solution Approach 1:
The sliding sleeve employs composite material design with erosion-resistant rings made of wear-resistant materials and sealing rubber barrels made of elastomeric materials. This combination of different materials provides both erosion resistance and sealing functionality without significantly increasing structural complexity.
3Reliability
If sealing structures are added to prevent blow-by, then sealing reliability improves, but device complexity increases
Solution Approach 1:
The sealing rubber barrel is made of flexible elastomeric material that can deform and conform to the sealing cavity wall. This flexible sealing mechanism provides reliable sealing without requiring complex rigid sealing structures, thereby maintaining relative simplicity while improving sealing reliability.
Data Source
AI summary
A new sliding sleeve relates to the technical field of oil and gas well completion and reservoir stimulation, comprising an upper connector, a lower connector, an outer housing, an inner sleeve and a shear pin. The upper connector and the lower connector are respectively connected to two ends of the outer housing, and the inner sleeve is locked in the outer housing via the shear pin, wherein a flow guiding hole is provided in the outer housing, and the inner sleeve can open or close the flow guiding hole, wherein at least two grooves for engaging with at least two corresponding tooth-shaped elements on a sliding sleeve opening tool are disposed along an axial direction in the inner sleeve, and wherein an erosion-resistant ring is embedded in the groove, and an inner diameter of the erosion-resistant ring is larger than or equal to an inner diameter of the inner sleeve.