Downhole Laser Steam Generator for Viscous Oil Recovery
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Solution Overview
Problem
High viscosity oil in unconventional reservoirs poses challenges for drilling and recovery, as existing steam injection methods suffer from heat loss and decreased steam quality with increasing wellbore depth, necessitating more efficient well stimulation techniques.
Innovation Solution
A steam generating apparatus is deployed in the wellbore, utilizing a laser source to convert water into steam in situ, reducing heat loss and increasing energy efficiency by generating steam proximate target zones, thereby enhancing hydrocarbon production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If steam is injected from surface into deep wellbore, then well stimulation is achieved, but heat loss increases and steam quality decreases with increasing wellbore depth
Solution Approach 1:
The patent transitions from surface-level steam generation to downhole steam generation, changing the spatial dimension where steam is produced. By placing the steam generating apparatus at the target depth within the wellbore, steam is generated in situ rather than being transported from the surface, thereby eliminating heat loss during long-distance transmission and maintaining high steam quality at the treatment zone.
Solution Approach 2:
The patent introduces a laser beam as an intermediary energy transmission medium. The laser beam transmits energy from the surface through the wellbore to the downhole steam generating apparatus, enabling remote activation of steam generation without direct mechanical connection or physical transport of steam from surface equipment.
2Productivity
If steam is generated at surface and injected downhole, then stimulation operation is performed, but energy efficiency decreases due to heat loss during transmission
Solution Approach 1:
The invention changes the spatial location of steam generation from surface to downhole environment. This dimensional shift allows steam to be produced exactly where it is needed, eliminating energy-wasting heat loss during vertical transmission through the wellbore and improving overall energy efficiency of the stimulation operation.
Solution Approach 2:
The downhole steam generating apparatus is self-contained and autonomously converts water to steam at the target location using laser energy. The system serves itself by having all necessary components (water container, laser receiver, steam generation chamber) integrated in the downhole environment, eliminating dependency on surface infrastructure and reducing energy transmission losses.
3Reliability
If conventional steam injection is used, then oil recovery is enhanced, but high viscosity oil remains difficult to extract due to heat loss
Solution Approach 1:
The patent relocates the steam generation process from surface level to downhole target zone, fundamentally changing where thermal energy is applied. This spatial repositioning ensures that steam is generated at the exact location where high viscosity oil needs treatment, maintaining high temperature effectiveness without the degrading heat loss that occurs during surface-to-downhole steam transmission.
Solution Approach 2:
The invention changes the physical state and temperature parameters of water by using laser energy to directly convert water to high-temperature steam in situ. This parameter transformation occurs at the target depth, creating localized high-temperature zones that effectively reduce oil viscosity and improve recovery without relying on long-distance thermal transmission.
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
The solution effectively reduces viscosity of high viscosity oils, increasing hydrocarbon production and energy efficiency by generating steam directly at the target zones, minimizing heat loss and maintaining steam quality.
Implementation Method 1
The steam generating apparatus converts water inside the container into steam using a laser signal transmitted to the container from the laser source
Data Source
AI summary
An apparatus may include an inlet and an enclosure includes a container that is coupled to the inlet. The container may receive water from the inlet. The apparatus may further include various check valves coupled to the container. The apparatus may further include a laser head coupled to the container. The laser head may receive a laser signal that converts the water inside the container into steam. The check valves may release the steam outside the enclosure.