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Compositions and processes for downhole cementing operations

a cementing operation and cementing process technology, applied in the direction of chemistry apparatus and processes, wellbore/well accessories, sealing/packing, etc., can solve the problems of inability to prevent fluid migration, inability to control the fluid flow of the cavity or wellbore, and the cement employed for the aforementioned operations is often prone to a variety of deficiencies

Inactive Publication Date: 2018-11-08
PUMPROCK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a new method of cementing a well that solves problems with conventional cements used in downhole oil and gas operations. The new method involves pumping a suspension made of a thermosetting resin, a microscopic filler, an aggregate, and an intercalatable or exfoliatable nanoclay. The suspension cures when exposed to a catalyst, resulting in a strong and flexible cement that can withstand high pressures and corrosion. The new cement composition has superior strength, flexibility, and toughness compared to conventional cements. The technical effects of this patent are improved well construction and reduced risk of failure and damage to the well.

Problems solved by technology

Initially a hole is drilled in the earth to a depth at which earth cave-in or wellbore fluid control become potential issues.
While the casing may structurally prevent cave-in, it will not prevent fluid migration along a length of the well in the annulus.
Unfortunately, the cements employed for the aforementioned operations often suffer from a variety of deficiencies.
For example, the cements may not have sufficient strength, flexibility, or toughness to withstand the pressures, corrosion, and other stresses that may often be encountered downhole.
Failure of the cement may lead to disastrous and expensive consequences to the well and / or the surrounding environment.
Similarly, currently available cements may be cumbersome to process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051]41% by weight of an unsaturated polyester resin is mixed with 41% by weight of calcium carbonate with a particle size distribution ranging from 5 to 20 microns and 18 percent by weight of chopped glass fiber. The mixture is stirred until it appears to be a substantially homogeneous suspension. The suspension can then be mixed with a curing agent such as benzoyl peroxide or methyl ethyl ketone peroxide and pumped or placed in a desired location such as an annulus of a wellbore.

[0052]Depending upon resin chemistry and particle size distribution the cured compositions may yield the following range of properties using the ASTM testing methods described above:

[0053]Density of 1.3 to 1.7 gm / cc; Tensile Strength of 1000-5000 psi; Flex strength of 5000-10000 psi; Compressive strength in the range of 7000-20000 psi; a fracture toughness of 0.2 to 1.3 MPa root meter; and a glass transition temperature of 60 to 150° C.

example 2

[0054]In a similar manner as Example 1, 15% by weight of an unsaturated polyester resin is mixed with 30% sand (#12 and #20), 35% of #5 gravel, and 20% of CaCO3 to form a substantially homogeneous suspension. The suspension can then be mixed with a curing agent such as benzoyl peroxide or methyl ethyl ketone peroxide and pumped or placed in a desired location such as an annulus of a wellbore.

[0055]Depending upon resin chemistry and particle size distribution the cured compositions may yield the following range of properties using the ASTM testing methods described above:

[0056]Tensile strength of 1000-1400 psi; Compressive Strength of 8000-22000 psi; Flex strength of 2000-8000 psi; Density of 2.2-2.5 gm / cc; glass transition temp of about 60-150 C; and a fracture toughness of 0.3 to 0.6 MPa root meter.

example 3

[0057]Example 1 is repeated except that 10-30% by weight of glass beads or microspheres are substituted for an equal portion of the resin and filler.

[0058]Depending upon resin chemistry and particle size distribution the cured compositions may yield the following range of properties using the ASTM testing methods described above:

[0059]Tensile strength of 1000-3000 psi; Compressive Strength of 6000-20000 psi; Flex strength of 2000-8000 psi; Density of 0.7-1.3 gm / cc; glass transition temp of about 60-150 C; and a fracture toughness of 0.3 to 0.6 MPa root meter.

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Abstract

The present invention relates to methods of cementing, for example, an oil or gas well. The method may involve pumping a suspension of a filler mixture and at least about 5 weight percent of a thermosetting resin based on the total weight of resin and filler mixture. Advantages may include superior properties and reliability as compared to conventional cementing operations often involving Portland cement.

Description

FIELD OF THE INVENTION[0001]The instant invention pertains to, for example, novel compositions and processes for downhole cementing operations.BACKGROUND AND SUMMARY OF THE INVENTION[0002]As part of the wellbore construction process, a hole or wellbore is typically drilled into the earth and then often lined with a casing or liner. Usually sections of casing or liner are threaded together or otherwise connected as they are run into the wellbore to form what is sometimes referred to as a “string.” Such casing may comprise a steel tubular “pipe” having an outer diameter that is smaller than the inner diameter of the wellbore. Because of the differences in those diameters, an annular area occurs between the inner diameter of the wellbore and the outer diameter of the casing. Absent the presence of anything else, wellbore fluids and earth formation fluids may migrate lengthwise along the wellbore in that annular area.[0003]Wells are typically constructed in stages. Initially a hole is d...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K8/44C04B26/10C04B26/18C04B26/28E21B33/13C04B26/04C04B14/02C04B14/04C04B14/06C04B14/10C04B14/28C04B20/00
CPCC09K8/44C04B26/10C04B26/18E21B33/13C04B26/04C04B26/285C04B20/008C04B20/0096C04B26/14C04B14/02C04B14/022C04B14/04C04B14/042C04B14/06C04B14/106C04B14/28C04B14/34C04B14/10C04B14/104C04B2103/0085C04B2103/44C04B2103/445
Inventor SHANBHAG, RUCHIR
Owner PUMPROCK