Downhole assembly for treating wellbore components, and method for treating a wellbore
First Claim
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1. A downhole assembly for delivering chemical treatment to a wellbore, comprising:
- a first tubular body;
a second tubular body residing substantially concentrically within the first tubular body, the second tubular body being porous to provide fluid communication between the first tubular body and a bore within the second tubular body;
an annular region between the second tubular body and the surrounding first tubular body;
a chemical treating material, wherein;
the chemical treating material is in solid phase but is dissolvable upon contact with a wellbore fluid and is designed to (i) inhibit a build-up of precipitate on components in the wellbore, (ii) remove scale on components in the wellbore, (iii) prevent a build-up of bacteria in the wellbore, (iv) prevent a build-up of paraffin in the wellbore, or (v) combinations thereof;
the chemical treating material resides within either a bore of the second tubular body or the annular region around the second tubular body; and
the chemical treating material is a continuous solid material in the shape of one or more discs; and
the discs reside in the annular region between the second tubular body and the surrounding first tubular body; and
the second tubular body is a perforated tubing; and
the surrounding first tubular body is a wire-wrapped screen having slots dimensioned to control a rate of dissolution of the solid chemical treating material.
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Abstract
A downhole assembly for delivering chemical treatment to a wellbore at the level of a hydrocarbon-bearing formation is provided. The chemical treatment is in solid phase, and slowly dissolves when exposed to wellbore fluids. A method of treating a wellbore using a solid chemical is also provided.
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Citations
39 Claims
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1. A downhole assembly for delivering chemical treatment to a wellbore, comprising:
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a first tubular body; a second tubular body residing substantially concentrically within the first tubular body, the second tubular body being porous to provide fluid communication between the first tubular body and a bore within the second tubular body; an annular region between the second tubular body and the surrounding first tubular body; a chemical treating material, wherein; the chemical treating material is in solid phase but is dissolvable upon contact with a wellbore fluid and is designed to (i) inhibit a build-up of precipitate on components in the wellbore, (ii) remove scale on components in the wellbore, (iii) prevent a build-up of bacteria in the wellbore, (iv) prevent a build-up of paraffin in the wellbore, or (v) combinations thereof; the chemical treating material resides within either a bore of the second tubular body or the annular region around the second tubular body; and the chemical treating material is a continuous solid material in the shape of one or more discs; and
the discs reside in the annular region between the second tubular body and the surrounding first tubular body; andthe second tubular body is a perforated tubing; and
the surrounding first tubular body is a wire-wrapped screen having slots dimensioned to control a rate of dissolution of the solid chemical treating material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A downhole assembly for delivering chemical treatment to a wellbore, comprising:
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a first tubular body defining a wire-wrapped screen; a second tubular body residing substantially concentrically within the first tubular body, the second tubular body defining a section of perforated tubing that provides fluid communication between the first tubular body and a bore within the second tubular body; a plug at a lower end of the second tubular body providing a fluid seal to a bottom of the downhole assembly; a first section of blank pipe disposed at an upper end of the second tubular body and having a bore that is in fluid communication with the bore of the second tubular body; and a chemical treating material, wherein; the chemical treating material is in a solid phase but is dissolvable upon contact with a wellbore fluid and is designed to (i) inhibit a build-up of precipitate on components in the wellbore, (ii) remove scale and corrosion on components in the wellbore, (iii) prevent a build-up of bacteria in the wellbore, (iv) prevent a build-up of paraffin in the wellbore, or (v) combinations thereof; the chemical treating material resides within the bore of the second tubular body and in the bore of the section of blank pipe; and the chemical treating material is in the form of two or more substantially solid cylinders. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of treating a wellbore using a solid treating material, comprising:
running a downhole assembly into a wellbore, the downhole assembly comprising; a first tubular body; a second tubular body residing substantially concentrically within the first tubular body, the second tubular body being porous to provide fluid communication between the first tubular body and a bore within the second tubular body; an annular region between the second tubular body and the surrounding first tubular body; a chemical treating material, wherein; the chemical treating material is in solid phase but is dissolvable upon contact with a wellbore fluid and is designed to (i) inhibit a build-up of precipitate on components in the wellbore, (ii) remove scale and corrosion on components in the wellbore, (iii) prevent a build-up of bacteria in the wellbore, (iv) prevent a build-up of wax or paraffin in the wellbore, or (v) combinations thereof; the chemical treating material resides within either the second tubular body or the annular region around the second tubular body; and the chemical treating material is a continuous solid material in the shape of one or more discs; and
the discs reside in the annular region between the second tubular body and the surrounding first tubular body; andthe second tubular body is a perforated tubing; and
the surrounding first tubular body is a wire-wrapped screen having slots dimensioned to control a rate of dissolution of the solid chemical treating material.- View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
Specification