Tandem Single String Reactive LCM Pill Applications
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for sealing lost circulation zones in wellbore drilling operations are inefficient, as they often result in significant fluid loss and require costly chemical sealants or particulate materials, which may not effectively address large vugular or fractured formations.
Innovation Solution
A method involving the sequential pumping of a first reactant pill, a spacer, and a second reactant pill through a drill string to create a seal in lost circulation zones, where the reactants react to form a hardened seal, allowing continued drilling operations without fluid loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical sealants or particulate materials are used to seal lost circulation zones, then sealing effectiveness may be improved, but fluid loss increases and operational interruptions occur
Solution Approach 1:
The treatment fluid is divided into multiple segregated reactant pills (first reactant pill, second reactant pill) that are pumped sequentially through the drill string. Each pill contains different reactive components that remain separated during pumping but react upon contact in the lost circulation zone, creating a seal without requiring large volumes of conventional sealants.
Solution Approach 2:
The invention changes the chemical state and reactivity parameters of the treatment fluid by using reactive components that transform from inactive segregated states to an active reactive state upon contact in the formation. This allows the system to achieve effective sealing with minimal fluid volume by controlling when and where the chemical reaction occurs.
2Reliability
If conventional sealants are pumped into lost circulation zones, then sealing may be achieved, but drilling operations must be interrupted
Solution Approach 1:
The reactive components in the treatment fluid automatically react with each other upon contact in the lost circulation zone, creating a seal without requiring external intervention or interruption of drilling operations. The system self-activates the sealing mechanism through the natural mixing of reactants in the formation, allowing continuous drilling while the seal forms.
3Reliability
If large volumes of treatment fluid are pumped to seal lost circulation zones, then sealing coverage may be improved, but fluid loss to the formation increases
Solution Approach 1:
The invention transforms the treatment fluid from a passive volumetric sealant into an active reactive system where small volumes of segregated reactant pills create a seal through chemical reaction. The reactive components expand or transform in situ upon contact, providing enhanced sealing coverage from minimal pumped volumes without proportionally increasing fluid loss to the formation.
4Reliability
If reactive components are mixed before pumping, then reaction efficiency may be improved, but premature reaction in the drill string occurs
Solution Approach 1:
The treatment fluid is segmented into multiple separate reactant pills that are pumped sequentially through the drill string. This segmentation maintains physical separation of reactive components during pumping, preventing premature reaction, while ensuring efficient reaction occurs when the segregated pills contact and mix in the lost circulation zone.
Solution Approach 2:
A spacer pill acts as an intermediary element between the first and second reactant pills during pumping. The spacer maintains separation between reactive components in the drill string, preventing premature reaction, while allowing controlled mixing and efficient reaction to occur when all elements reach the lost circulation zone and the spacer dissolves or disperses.
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
This method effectively seals lost circulation zones, reducing fluid loss and enabling uninterrupted drilling by using a combination of reactants that form a stable seal, compatible with both water-based and oil-based drilling fluids, and can be tailored for specific drilling conditions.
Implementation Method 1
the one or the plurality of first reactants to react, within the lost circulation zone, with the one or the plurality of second reactants for a reaction time to provide a seal of the lost circulation zone
Data Source
AI summary
A method of sealing a lost circulation zone (LCZ) during a drilling operation by: positioning a bottom hole assembly (BHA) at an initial position proximate a LCZ in a wellbore, wherein the BHA includes a drill bit fluidly connected with a surface of the wellbore via a drill string; and pumping first and second reactant pills and a spacer into the LCZ via the drill string and the drill bit, wherein the first reactant pill includes one or more first reactants, wherein the second reactant pill includes one or more second reactants, wherein the first reactant pill is pumped into the LCZ prior to the second reactant pill due to introducing of the spacer into the drill string between the first and second reactant pills, and wherein, after a reaction time, reactants comprising the one or more first and second reactants react within and provide a seal of the LCZ.