Method for chemically treating hydrocarbon fluid in a downhole wellbore
First Claim
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1. A method for chemically treating a hydrocarbon fluid in a downhole wellbore, comprising:
- a. forming a downhole chemical treatment assembly, the downhole chemical treatment assembly comprising;
(i) a blank tubular having a first end, a second end, a central axis and an outer diameter, and wherein the blank tubular consists of;
1. an upper blank tubing section;
2. a first perforated section with a plurality of first perforations in series with the upper blank tubing section;
3. a middle blank tubing section formed adjacent the first perforated section;
4. a second perforated section formed in series with the middle blank tubing section having a plurality of second perforations, wherein 200 percent to 2000 percent more second perforations are formed than first perforations; and
5. a lower blank tubing section formed adjacent the second perforated section;
(ii) an upper collar secured around the first end with an upper collar outer diameter;
(iii) a lower collar secured around the second end with a lower collar diameter, and each collar has an outer diameter larger than the blank tubular outer diameter;
(iv) a dissolving solid chemical treating material filling the blank tubular from the upper blank tubing section to the lower blank tubing section, comprising a chemical adapted to dissolve upon contact with the hydrocarbon fluid from the downhole wellbore to treat a member of the group comprising;
1. carbonate scale buildup;
2. chloride scale buildup;
3. iron scale buildup;
4. paraffin buildup;
5. corrosion;
6. asphaltene buildup; and
7. combinations thereof;
(v) a first tubular filtering screen encircling the first perforated section, wherein the first tubular filtering screen comprises;
1. a plurality of longitudinally oriented first ribs disposed around the central axis; and
2. a continuous wrapped first wire wound around the longitudinally oriented first ribs forming a plurality of first slots between the continuous wrapped first wire, and the first slots are dimensioned to control a rate of dissolution of the dissolving solid chemical treating material though the first slots while forming a first annulus between the continuous wrapped first wire and the first perforated section;
(vi) a second tubular filtering screen encircling the second perforated section, the second tubular filtering screen comprising;
1. a plurality of longitudinally oriented second ribs and disposed around the central axis; and
2. a continuous wrapped second wire wound around the longitudinally oriented second ribs forming a plurality of second slots, and the second slots are dimensioned to control a rate of dissolution of the dissolving solid chemical treating material through the second slots while forming a second annulus between the continuous wrapped second wire and the second perforated section;
(vii) a plurality of weld rings, wherein each weld ring secures an end of one of the tubular filtering screens;
(viii) a no-flow nipple secured to the upper collar to seal the downhole chemical treatment assembly; and
(ix) a bull plug secured to the lower collar to seal the downhole chemical treatment assembly;
b. attaching the formed downhole chemical treatment assembly to a member of the group consisting of;
tubing to be run into the well bore;
a bottom hole assembly for running into a wellbore;
a wireline for running into a wellbore;
a sand screen filter intake for use in a wellbore;
a gas separator for use in a wellbore;
a perforated lifting sub;
or a seating nipple for use in a wellbore;
c. running the attached downhole chemical treatment assembly into the wellbore;
d. securing the downhole chemical treatment assembly to a member of the group consisting of;
a perforating lifting subs, a sand screen filter intake, a gas separator, a seating nipple;
an electric submersible pump (ESP), a plunger lift, a jet pump, a gas lift, and combinations thereof;
which have been run into the wellbore after the downhole chemical treatment assembly; and
e. allowing well fluid to penetrate slots of the tubular filtering screens and dissolve the dissolving solid chemical treating material of the downhole chemical treatment assembly at a dissolution rate from 10 ppm to 180 ppm into the hydrocarbon fluid.
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Abstract
A method for downhole delivering of chemicals to a wellbore at the level of a hydrocarbon-bearing formation using an assembly formed form a blank tubular with first and second perforation sections, a no-flow nipple connected on one end and a bull plug connected on the other end, wherein the chemical is in solid phase, and slowly dissolves when exposed to wellbore fluids forming a method that can be repeated with the same equipment but additional charges of chemical.
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Citations
19 Claims
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1. A method for chemically treating a hydrocarbon fluid in a downhole wellbore, comprising:
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a. forming a downhole chemical treatment assembly, the downhole chemical treatment assembly comprising; (i) a blank tubular having a first end, a second end, a central axis and an outer diameter, and wherein the blank tubular consists of; 1. an upper blank tubing section; 2. a first perforated section with a plurality of first perforations in series with the upper blank tubing section; 3. a middle blank tubing section formed adjacent the first perforated section; 4. a second perforated section formed in series with the middle blank tubing section having a plurality of second perforations, wherein 200 percent to 2000 percent more second perforations are formed than first perforations; and 5. a lower blank tubing section formed adjacent the second perforated section; (ii) an upper collar secured around the first end with an upper collar outer diameter; (iii) a lower collar secured around the second end with a lower collar diameter, and each collar has an outer diameter larger than the blank tubular outer diameter; (iv) a dissolving solid chemical treating material filling the blank tubular from the upper blank tubing section to the lower blank tubing section, comprising a chemical adapted to dissolve upon contact with the hydrocarbon fluid from the downhole wellbore to treat a member of the group comprising; 1. carbonate scale buildup; 2. chloride scale buildup; 3. iron scale buildup; 4. paraffin buildup; 5. corrosion; 6. asphaltene buildup; and 7. combinations thereof; (v) a first tubular filtering screen encircling the first perforated section, wherein the first tubular filtering screen comprises; 1. a plurality of longitudinally oriented first ribs disposed around the central axis; and 2. a continuous wrapped first wire wound around the longitudinally oriented first ribs forming a plurality of first slots between the continuous wrapped first wire, and the first slots are dimensioned to control a rate of dissolution of the dissolving solid chemical treating material though the first slots while forming a first annulus between the continuous wrapped first wire and the first perforated section; (vi) a second tubular filtering screen encircling the second perforated section, the second tubular filtering screen comprising; 1. a plurality of longitudinally oriented second ribs and disposed around the central axis; and 2. a continuous wrapped second wire wound around the longitudinally oriented second ribs forming a plurality of second slots, and the second slots are dimensioned to control a rate of dissolution of the dissolving solid chemical treating material through the second slots while forming a second annulus between the continuous wrapped second wire and the second perforated section; (vii) a plurality of weld rings, wherein each weld ring secures an end of one of the tubular filtering screens; (viii) a no-flow nipple secured to the upper collar to seal the downhole chemical treatment assembly; and (ix) a bull plug secured to the lower collar to seal the downhole chemical treatment assembly; b. attaching the formed downhole chemical treatment assembly to a member of the group consisting of;
tubing to be run into the well bore;
a bottom hole assembly for running into a wellbore;
a wireline for running into a wellbore;
a sand screen filter intake for use in a wellbore;
a gas separator for use in a wellbore;
a perforated lifting sub;
or a seating nipple for use in a wellbore;c. running the attached downhole chemical treatment assembly into the wellbore; d. securing the downhole chemical treatment assembly to a member of the group consisting of;
a perforating lifting subs, a sand screen filter intake, a gas separator, a seating nipple;
an electric submersible pump (ESP), a plunger lift, a jet pump, a gas lift, and combinations thereof;
which have been run into the wellbore after the downhole chemical treatment assembly; ande. allowing well fluid to penetrate slots of the tubular filtering screens and dissolve the dissolving solid chemical treating material of the downhole chemical treatment assembly at a dissolution rate from 10 ppm to 180 ppm into the hydrocarbon fluid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification