High-Temperature Filter Cake Breaker with Delaying Agent
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Solution Overview
Problem
Existing filter cake removal compositions are ineffective at high temperatures, leading to uncontrolled acid release and operational challenges in wellbores, particularly in high-temperature environments such as those found in the Middle East, which hampers the efficient recovery of natural resources like oil and gas.
Innovation Solution
A high-temperature filter cake breaking system (HT-BS) comprising an acid precursor and a delaying agent, such as sodium hexametaphosphate (SHMP), which slows down the hydrolysis of esters, allowing for controlled acid release and effective filter cake removal at temperatures ranging from 30°C to 180°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ester-based acid precursor compositions are used for filter cake removal, then the compositions are neutral at surface and easy to operation, but the rate of acid release becomes uncontrolled at high temperatures
Solution Approach 1:
A delaying agent is introduced as an intermediary substance that moderates the hydrolysis reaction of the ester-based acid precursor. The delaying agent controls the rate at which acid is released from the ester, preventing uncontrolled acid release at high temperatures while maintaining the neutral nature and ease of operation of the composition at surface conditions.
Solution Approach 2:
The invention changes the chemical parameters of the system by adding a delaying agent that alters the hydrolysis kinetics of the ester. This parameter change allows the composition to maintain controlled acid release across a wide temperature range (30°C to 180°C), transforming the temperature-sensitive reaction into a controllable process suitable for high-temperature wellbore environments.
2Ease of operation
If existing filter cake removal compositions are used at high temperatures, then operational simplicity is maintained, but the compositions become ineffective and cause uncontrolled acid release
Solution Approach 1:
The invention creates a composite composition by combining the ester-based acid precursor with a delaying agent. This composite material maintains the operational simplicity of the original ester-based composition while adding the functionality of temperature control and extended effectiveness, allowing reliable operation from 30°C to 180°C.
3Productivity
If the temperature in wellbores increases, then the rate of acid release increases, but the control over acid release is lost
Solution Approach 1:
The delaying agent serves as a mediator between temperature and acid release rate. It intercepts the temperature effect on ester hydrolysis, converting the uncontrolled temperature-dependent reaction into a controlled process where acid release remains manageable even at elevated temperatures up to 180°C.
Solution Approach 2:
The delaying agent provides preliminary anti-action by pre-establishing control mechanisms against the anticipated harmful effect of high temperature. Before uncontrolled acid release can occur, the delaying agent is already in place to moderate the hydrolysis reaction, preventing the loss of control.
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 HT-BS effectively delays the hydrolysis of esters, reducing the rate of acid release and maintaining operational efficiency across a wide temperature range, thereby facilitating the removal of filter cake while minimizing formation damage and corrosion, thus enhancing hydrocarbon recovery processes.
Implementation Method 1
These esters mostly get activated at elevated temperatures to release acid by hydrolysis however, the rate of acid release increases with increasing temperature
Data Source
AI summary
A breaker composition comprising: (i) an acid precursor, (ii) a delaying agent and (iii) an aqueous fluid wherein the breaker composition has an effective operating temperature range of from about 25° C. to about 180° C. A wellbore servicing system comprising (a) an aqueous-based drilling fluid, wherein the aqueous-based drilling fluid forms water-wet solids in the wellbore; and (b) a breaker composition comprising (i) an acid precursor, (ii) a delaying agent and (iii) an aqueous fluid. A method of dissolving a filtercake comprising contacting the filtercake with a breaker solution comprising (i) an acid precursor, (ii) a delaying agent and (iii) an aqueous fluid wherein the filtercake comprises calcium carbonate.