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Stimuli Responsive Polymers for Temporary Fluid Loss Control and Water Shut off Applications for Subterranean Formations

IP.com Disclosure Number: IPCOM000242331D
Publication Date: 2015-Jul-07
Document File: 6 page(s) / 1M

Publishing Venue

The IP.com Prior Art Database

Abstract

Stimuli responsive polymer is a class of functional polymers that change their properties and performance depending on the external stimuli1. The stimuli can include pH, temperature, light, electrical and magnetic field etc. The responses can include polymer swelling or shrinking, change in shape, solubility, and conductivity etc. In the present invention, the stimuli responsive polymer, poly (N, N Dimethylaminoethyl methacrylate-co-Styrene-co-Ethylene glycol dimethacrylate) was evaluated as a temporary fluid loss control pill and as a conformance application sealant to plug water producing zones within a subterranean formation. The disclosed method and compositions can be useful in general for all wellbore fluid loss control applications and in all formations that require conformance solution and more particularly when increased radial penetration within the reservoir is desired.

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Stimuli Responsive Polymers for Temporary Fluid Loss Control and Water Shut off Applications for Subterranean Formations

Abstract:

Stimuli responsive polymer is a class of functional polymers that change their properties and performance depending on the external stimuli1. The stimuli can include pH, temperature, light, electrical and magnetic field etc. The responses can include polymer swelling or shrinking, change in shape, solubility, and conductivity etc. In the present invention, the stimuli responsive polymer, poly (N, N Dimethylaminoethyl methacrylate-co-Styrene-co-Ethylene glycol dimethacrylate) was evaluated as a temporary fluid loss control pill and as a conformance application sealant to plug water producing zones within a subterranean formation. The disclosed method and compositions can be useful in general for all wellbore fluid loss control applications and in all formations that require conformance solution and more particularly when increased radial penetration within the reservoir is desired.

Introduction:

Stimuli responsive polymer for temporary fluid loss control and water shut-off

Figure1. Stimuli responsive polymer for enhanced oil recovery

Containment of fluid loss is one of the biggest / severest challenge that operators face during various completion and work-over operations2,3. This is even more critical when dealing with highly permeable zones as expensive completion fluids are pushed into the porosity of the formations, usually resulting in permeability damage. Although widely used, mechanical techniques have associated drawbacks, such as, plug failure especially at HPHT conditions, requiring additional trips. With industry need for a low cost and better fluid loss control (FLC) system, many chemical systems have been developed to overcome such issues. These include linear polymers, CaCO3 + polymer gel, sized salt + polymer gel and oil-soluble resins etc. Although effective, these are very expensive and additionally they can leave residue behind as a result of incomplete break. This disclosure here is related to use of stimuli responsive polymers for the above mentioned application. Polymer is selected based on its swelling and de-swelling properties in acidic and alkaline environment respectively.

This disclosure is further targeted to be used as a water shut-off sealant. Excessive water production is a serious issue faced by the oil industry and is extremely detrimental to the economics of producing wells. Treating produced water can be extremely costly and disposal or re-injection requires compliance to local environmental regulations. Various chemical shut-off systems have been used as water control techniques to control unwarranted production4,5. The above described swellable polymer composition can be pumped downhole in the target region and swelled to conform to the dimensions of the fractures, fissures and voids and prevent the inflow of water and thus function as a water shut-off sealant. The formulation ca...