Downhole assembly for treating wellbore components, and method for treating a wellbore

摘要

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.

主权项

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; andthe 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.