Sliding Sleeve Valve Sampling System for Cased Well Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for sampling and testing reservoir fluids in mature wells face challenges such as contamination, limited access, and damage to casing integrity, restricting continuous monitoring and optimization of recovery strategies.
Innovation Solution
A sampling system utilizing telescoping sleeve valves and inflatable sealing elements within the tubing, allowing for repeated and continuous fluid sampling without damaging the casing, and enabling monitoring throughout the well's life by isolating sections with swellable elastomers and PVT gauges for parameter measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a tool penetrates the casing to withdraw samples, then sampling can be conducted in cased wells, but casing integrity is compromised and restoration is difficult, dangerous, and costly
Solution Approach 1:
The production tubing string is divided into multiple isolated sections using packers, allowing sampling operations to be performed on individual sections without affecting the entire wellbore structure or casing integrity
Solution Approach 2:
A sliding sleeve valve acts as an intermediary mechanism that can be opened to allow sampling tools to access the formation through the tubing without penetrating or damaging the outer casing structure
2Ease of operation
If sampling is conducted before well casing and cementing, then sampling is simplified with drilling mud providing hydrostatic pressure, but the well cannot be used as a cased hole observation well during production
Solution Approach 1:
The sliding sleeve valve provides dynamic control over fluid flow paths, allowing the well to transition between different operational modes (sampling, production, observation) throughout its lifecycle without requiring permanent structural modifications
Solution Approach 2:
The cased well configuration with the sliding sleeve valve enables multiple functions including continuous sampling, production, and observation throughout the well's production life, eliminating the need to choose between early sampling simplicity and long-term versatility
3Productivity
If repeated sampling is conducted in mature wells, then recovery strategies can be optimized over time, but contamination and limited access increase operational complexity
Solution Approach 1:
The well is prepared in advance with pre-installed packers creating isolated sections and sliding sleeve valves positioned at strategic locations, enabling repeated sampling operations without requiring complex real-time interventions or risking contamination
Solution Approach 2:
The system enables continuous sampling operations throughout the well's production life by maintaining sealed sections and allowing repeated access through the sliding sleeve valve without compromising sample integrity or requiring system reconfiguration
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, repeated, and continuous fluid sampling and monitoring without damaging the tubing or casing, facilitating better recovery strategies by tracking changes in reservoir conditions over the well's life.
Implementation Method 1
swellable elastomers positioned between the tubing and the bore walls can substantially form a seal
Implementation Method 2
PVT gauges positioned outside the tubing can be used to measure parameters of the reservoir fluid
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
A well completion system (10) includes tubing (16), and packers (19) that seal the annulus (24) of the well outside the tubing (16). The packers (19) are spaced to define voids in the annulus (24) that are substantially free from hydrostatic pressure. Also included are hollow sleeve valves (18) having upper and lower sealing elements (28, 30), and that have closed and open positions. Each sleeve valve (18) is positioned within the tubing (16) at a depth corresponding to a void in the annulus (24). Ports (26) extend through the sleeve valve (18) and tubing (16), so that when the sleeve valve (18) is closed, the port is closed, and when the sleeve valve (18) is open, the port is open. Also included is a sampling tool (32) having top and bottom sealing elements (34, 36), the bottom sealing element (36) for engaging the lower sealing element (30) of a sleeve valve (18), and the top sealing element (34) for engaging the upper sealing element (28) of the sleeve valve (18) when the sleeve valve (18) is open.