Swellable Lost Circulation Material for Drilling Fluid Loss Control
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Solution Overview
Problem
Lost circulation during drilling operations poses challenges due to excessive fluid loss, leading to well control issues, borehole instability, and formation damage, particularly in naturally fractured, cavernous, and high-permeable formations, where conventional methods fail to effectively control fluid loss.
Innovation Solution
A swellable Lost Circulation Material (LCM) device comprising a permeable membrane and swellable particles, designed to transition from a non-swollen to a swollen state when exposed to drilling fluid, is introduced into the target lost circulation zone, forming a plug to prevent fluid migration and minimize loss. The device can be mass-produced using a teabag machine and includes additives to enhance sealing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lost circulation materials are used in high-permeable formations, then fluid loss control is attempted, but the materials fail to effectively prevent severe or total fluid loss when pore size is greater than three times the particle size
Solution Approach 1:
The LCM particles undergo a parameter change by swelling when exposed to drilling fluid, transitioning from a small non-swollen state that can be pumped through the wellbore to a large swollen state that effectively plugs large pores and fractures. This swelling capability allows the particles to adapt their size to match the pore dimensions, overcoming the limitation where conventional fixed-size particles cannot effectively seal pores larger than three times their diameter.
Solution Approach 2:
The LCM particles are enclosed within a membrane structure, creating a nested configuration where the swellable material is contained inside the membrane. This nested structure allows the particle to maintain structural integrity during pumping while enabling volume expansion upon contact with drilling fluid, effectively deploying a smaller inner structure that expands to fill a larger space needed for plugging.
2Reliability
If LCM particles are introduced to plug large pores and fractures, then fluid loss is reduced, but the particles may be too large to be pumped into the wellbore
Solution Approach 1:
The LCM particles exhibit dynamic size adjustment capability, transitioning from a small non-swollen state during pumping operations to a large swollen state once deployed in the target zone. This dynamic behavior allows the same particle to satisfy both requirements: being small enough to be pumped through the wellbore and large enough to effectively plug pores and fractures, eliminating the need to choose between pumpability and sealing capability.
Solution Approach 2:
The critical parameter of particle size is changed by exposing the LCM particles to drilling fluid, which triggers swelling. This parameter change occurs after the particles have already been successfully pumped into position, allowing the system to achieve both pumpability (small initial size) and effective plugging (large final size) through a temporal sequence of size states.
3Reliability
If swelling LCM materials are used to control lost circulation, then fluid loss is reduced by up to 80%, but the materials require exposure to drilling fluid to activate swelling
Solution Approach 1:
The LCM particles are pre-positioned in the wellbore and at the lost circulation zone before actual fluid loss problems escalate. By introducing the non-swollen particles first and allowing them to be distributed to the target zone, the system is prepared in advance. When drilling fluid contacts the particles, swelling activates immediately, providing rapid response. This preliminary positioning reduces activation time by eliminating the need to pump larger volumes of swollen material to achieve the same plugging effect.
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 swellable LCM device effectively reduces fluid loss by up to 80% or makes it negligible, maintaining structural integrity and preventing formation damage by plugging lost circulation zones, thereby ensuring well stability and efficient drilling operations.
Implementation Method 1
allowing a fluidic component to permeate into the swellable LCM device through the membrane such that the fluidic component is in contact with the swellable LCM particle and the swellable LCM device transitions to a swollen state
Implementation Method 2
The membrane is permeable. The swellable LCM particle includes a swellable material. The swellable LCM particle is enclosed within the membrane.
Data Source
AI summary
Embodiments of the disclosure provide a method and device for controlling lost circulation in a target lost circulation zone in a borehole. A swellable lost circulation material device includes a permeable membrane and a swellable lost circulation material enclosed within the membrane. The swellable lost circulation material device in a non-swollen state is introduced to a target lost circulation zone where a fluidic component permeates into the swellable lost circulation material device through the membrane such that the fluid component is in contact with the swellable lost circulation material such that the swellable lost circulation material device transitions to a swollen state.