Casing Transmission Crossovers for Precise Interwell Fluid-Front Tracking
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Solution Overview
Problem
Existing hydrocarbon recovery techniques face challenges in tracking the fluid front position due to the lack of effective monitoring systems, leading to suboptimal operations and premature breakthrough, which reduces the efficiency of hydrocarbon extraction.
Innovation Solution
The use of casing segments with transmission crossover arrangements that include coil antennas and adapters for electromagnetic signal transmission, enabling interwell tomography and multi-lateral control, allowing for precise tracking of fluid fronts and optimizing recovery operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring systems are used, then the system complexity is low, but the measurement precision of fluid front position is insufficient
Solution Approach 1:
The patent replaces traditional mechanical monitoring systems with electromagnetic sensing technology. Sensors mounted on casing segments detect electromagnetic signals transmitted through the formation, enabling precise fluid front position tracking without complex mechanical intervention devices in the wellbore.
Solution Approach 2:
The patent introduces electromagnetic signals as an intermediary to indirectly measure fluid front position. Instead of directly observing the fluid front, the system uses electromagnetic wave propagation characteristics through the reservoir formation to infer the position, achieving high precision measurement without direct contact with the fluid front.
2Productivity
If no monitoring system is deployed, then the device complexity remains low, but premature breakthrough cannot be detected, reducing productivity
Solution Approach 1:
The patent implements a feedback mechanism where sensors continuously monitor electromagnetic signal changes indicating fluid front position, and this information feeds back to control systems that adjust injection rates in real-time. This closed-loop control prevents premature breakthrough by maintaining optimal injection production ratios, thereby maximizing hydrocarbon recovery efficiency.
Solution Approach 2:
The patent employs preliminary monitoring and prediction capabilities that detect fluid front movement before breakthrough occurs. By analyzing electromagnetic signal trends, the system predicts potential premature breakthrough scenarios and takes preventive actions, such as adjusting injection rates, before the problem manifests, thus maintaining optimal productivity.
3Measurement precision
If seismic surveys and monitoring wells are used, then measurement precision improves, but the device complexity and operational difficulty increase significantly
Solution Approach 1:
The patent makes the production and injection wells multi-functional by equipping them with electromagnetic sensors that serve dual purposes: standard hydrocarbon production/injection operations and fluid front monitoring. This eliminates the need for separate dedicated monitoring wells, reducing operational complexity while maintaining high measurement precision through electromagnetic sensing.
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
Enhances the ability to monitor and control fluid fronts within reservoirs, reducing premature breakthrough and improving the efficiency of hydrocarbon extraction by providing accurate data for interwell operations.
Implementation Method 1
a coil antenna that encircles an exterior of the casing tubular... conveying transmission signals from the surface interface to the at least one transmission crossover arrangement via the conductive path
Implementation Method 2
conveying the EM measurements obtained by the at least one transmission crossover arrangement to the surface interface via the conductive path
Data Source
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AI summary
An interwell tomography method includes casing a first borehole with a casing tubular having at least one transmission crossover arrangement, each transmission crossover arrangement having an adapter in communication with a coil antenna that encircles an exterior of the casing tubular. The method also includes deploying, inside the casing tubular, a conductive path that extends from a surface interface to the at least one transmission crossover arrangement. The method also includes providing a set of one or more antennas in a second borehole. The method also includes obtaining electromagnetic (EM) measurements for interwell tomography using the at least one transmission crossover arrangement and the set of one or more antennas, where said obtaining involves conveying data or power between the at least one transmission crossover arrangement and the surface interface via the conductive path.