Zeolite Drilling Fluids for Cementing Compatibility

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Solution Overview

Problem

Conventional drilling fluids create stable filter cakes that are difficult to remove and are incompatible with cementing compositions, leading to issues with cement gelling and becoming unpumpable, which complicates the cementing process in wellbores.

Innovation Solution

The use of drilling fluids containing zeolite, which are compatible with cementitious materials, allowing for direct cementing operations without prior removal of drilling fluid and filter cake, as zeolite does not cause the cement to gel, enabling efficient bonding of casing to wellbore walls.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If conventional drilling fluids with polymeric viscosifiers and bentonite are used, then the drilling fluid provides stable filter cake formation, but the filter cake becomes difficult to remove and the drilling fluid becomes incompatible with cementing compositions causing gelation

Engineering Contradiction:

Improvefilter cake stabilityVSAvoidcementing operation feasibility

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent changes the chemical composition parameters of the drilling fluid by replacing conventional polymeric viscosifiers and bentonite with zeolite-based additives. This parameter change transforms the drilling fluid from being incompatible with cementing compositions to compatible, preventing gelation while maintaining filter cake stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite drilling fluid system combining zeolite with carrier fluids and other compatible additives. This composite formulation maintains the beneficial properties of traditional drilling fluids while eliminating the incompatibility issue with cementing compositions through the zeolite component.

Inventive Principle:

Principle #40Composite materials

2Reliability

If drilling fluid and filter cake are removed from the wellbore prior to cementing, then the cementing composition can be pumped without gelling, but the cementing process becomes more complex and time-consuming

Engineering Contradiction:

Improvecementing composition pumpabilityVSAvoidcementing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent converts the previously harmful effect of drilling fluid presence (causing gelation) into a beneficial condition by using zeolite-based drilling fluid that is compatible with cementing compositions. The drilling fluid can remain in the wellbore and actually contribute to the cementing slurry without causing gelation, eliminating the need for removal operations.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent merges the drilling fluid and cementing composition into a single compatible system. The zeolite-containing drilling fluid can be directly mixed with cementitious materials to form pumpable slurry, combining two previously separate operations (drilling and cementing) into a more integrated process.

Inventive Principle:

Principle #5Merging (Combining)

3Manufacturing precision

If intermediate fluid removal steps are performed, then the cementing composition can bond properly to wellbore walls, but the overall drilling and cementing time increases

Engineering Contradiction:

Improvecement bonding qualityVSAvoiddrilling and cementing cycle time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent performs preliminary action by formulating the drilling fluid with zeolite before drilling operations begin. This pre-formulation ensures that the drilling fluid will be compatible with cementing compositions, eliminating the need for subsequent fluid removal steps and allowing for more efficient scheduling of cementing operations.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent enables continuity of useful action by eliminating the interruption required for fluid removal. The drilling fluid can remain in the wellbore continuously, and the cementing operation can proceed immediately afterward without requiring intermediate removal steps, thus maintaining continuous productive activity.

Inventive Principle:

Principle #20Continuity of useful action

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 approach eliminates the need for intermediate fluid removal steps, reduces waste, and ensures effective cementing by forming a compatible cementing composition that sets properly, enhancing the efficiency and reliability of wellbore cementing operations.

Implementation Method 1

drilling fluids comprising zeolite as described herein do not gel when contacted with cementitious material, and therefore contact with the drilling fluids described herein will not cause a cementing composition to become unpumpable

Methodology Applied

Scientific EffectChemical compatibility:

Implementation Method 2

The cementing composition sets into a hard impermeable mass, and is intended to bond the casing to the walls of the wellbore whereby the annulus is sealed

Methodology Applied

Scientific EffectCement setting:

Data Source

PatentEP1957602B1Drilling and cementing with fluids containing zeolite

Publication Date: 2012.12.19 HALLIBURTON ENERGY SERVICES INC

AI summary

Methods and compositions for cementing, especially drilling fluids that comprise zeolite and a carrier fluid, and cementing compositions made with such drilling fluids.