Fluid-loss control pills comprising breakers that comprise orthoesters and/or poly(orthoesters) and methods of use

a technology of fluid-loss control pills and breakers, which is applied in the direction of fluid removal, fluid removal, chemistry apparatus and processes, etc., can solve the problems of long cleanup periods, severe damage to near-well bore areas, and relatively limited invasion of formation faces of polymer-based fluid-loss control pills

Inactive Publication Date: 2007-03-01
HALLIBURTON ENERGY SERVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] The present invention relates to methods and compositions for treating subterranean formations, and more specifically, to self-destructing fluid-loss control pills for fluid-loss control in drilling, completion, and stimulation applications, and their associated methods.
[0009] One embodiment of the present invention provides a method comprising: providing a fluid-loss control pill that comprises an aqueous base fluid and a gelling agent, and a delayed-release acid breaker that

Problems solved by technology

Further, crosslinked fluid-loss control pills have demonstrated that they require relatively limited invasion of the formation face to be fully effective.
After their application, fluid-loss control pills can cause severe damage to near-well bore areas due to polymer filtration or filter-cake formation.
Polymer-based fluid-loss control pills often require long cleanup periods.
Such fluid circulation may not be feasible.
), it is often difficult to find an internal breaker for the fluid-loss control pills that will work effe

Method used

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examples

[0029] The following procedure was used to incorporate an orthoester breaker into a fluid-loss control pill. First, 1000 mL of 13.5 calcium bromide brine were poured into a blender jar (the brine was 88.07% 14.2 calcium bromide brine and diluted with 11.93% H2O to make up 13.5 calcium bromide brine with a pH of 4.46 (ideal is 4.4)). 100 mL of the above solution was retained for purging and CL-30 processing. The blender was mixed at a 20% blender speed. 48 g of “WG-33” gelling agent, which is available from Halliburton Energy Services, was placed into a plastic beaker and 40 mL of propylene glycol were added to it. The mixture was mixed by hand using a spatula to form a WG-33 / glycol dispersion. The WG-33 / glycol dispersion was then added to the brine in the blender at a slow stirring rate that was sufficient to mix the components but slow enough that air did not get introduced into the system. The mixing beaker was then purged of the dispersion by rinsing it with 95 mL of retained bri...

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PUM

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Abstract

Provided herein are methods and compositions for generating acids for use downhole, for example, to break fluid-loss control pills. The delayed-release acid breakers of the present invention comprise orthoesters and/or poly(orthoesters).

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to methods and compositions for treating subterranean formations, and more specifically, to self-destructing fluid-loss control pills for fluid-loss control in drilling, completion, and stimulation applications and their associated methods. “Fluid loss” refers to the undesirable migration or loss of fluids (such as the fluid portion of a drilling mud or cement slurry) into a subterranean formation. [0002] Providing effective fluid-loss control for well treatment fluids is highly desirable. A “well treatment fluid” is a fluid used in a subterranean application. The term “treatment” herein does not imply any particular action by the fluid or any component thereof. Fluid-loss control materials are additives specifically designed to lower the volume of a filtrate that passes through a filter medium. Most attain their fluid-loss control from the presence of solvent-specific solids, or from hydrated linear polymers that rely...

Claims

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Application Information

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IPC IPC(8): C09K8/00E21B43/00
CPCC09K8/506C09K8/514C09K8/512
Inventor SAINI, RAJESH K.SAVERY, KAREN
Owner HALLIBURTON ENERGY SERVICES INC
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