Acid wash system for wireline and slickline
AssigneeSaudi Arabian Oil Company
InventorsMohammed Y. Al Daif, Ahmed A. Al Jaafari
Life of this patent
Estimating the term…
Abstract
A system for acid treating a section of a well includes a wireline or slickline extending from a surface of the well into the well and a bailer tool assembly attached to an end of the wireline or slickline. The bailer tool assembly includes a first piston positioned in a first piston housing at an axial end of at least one bailer, the first piston being slidable through the at least one bailer, at least one rotatable nozzle positioned at a lower end of the bailer tool assembly and fluidly connected to a fluid reservoir in the at least one bailer, and a depth indicator tool attached to an upper end of the bailer tool assembly.
Claims18
A system for acid treating a section of a well, comprising:
- a wireline or slickline extending from a surface of the well into the well;
- a bailer tool assembly attached to an end of the wireline or slickline, the bailer tool assembly comprising:
- a first piston positioned in a first piston housing at an axial end of at least one bailer, the first piston being slidable through the at least one bailer;
- a nozzle assembly positioned at a lower end of the bailer tool assembly and fluidly connected to a fluid reservoir containing acid in the at least one bailer, wherein the nozzle assembly comprises at least one rotatable nozzle;
- wherein the at least one rotatable nozzle comprises an interior flow path extending therethrough, and wherein the at least one rotatable nozzle is rotatable about an axis extending along the interior flow path;
- and
- a depth indicator tool comprising at least one of a casing collar locator and a gamma ray unit attached to an upper end of the bailer tool assembly.
A downhole tool assembly, comprising:
- a first bailer comprising a first fluid reservoir containing acid;
- a first piston positioned at an axial end of the first bailer and slidable through the first fluid reservoir, wherein the first piston is a weight bar releasably held by a support;
- a plurality of nozzles positioned at an opposite axial end of the first bailer from the first piston;
- and
- a position indicator selected from at least one of a gamma ray device and a casing collar locator.
A method of acid treating a section of a well, comprising:
- sending a bailer tool assembly down a well on a wireline or slickline, the bailer tool assembly comprising:
- a first bailer comprising a first fluid reservoir;
- a first piston positioned at an axial end of the first bailer and slidable through the first fluid reservoir;
- a plurality of rotatable nozzles positioned at an opposite axial end of the first bailer from the first piston, wherein the plurality of rotatable nozzles have at least one helical channel formed along an interior flow path of each rotatable nozzle, such that the plurality of rotatable nozzles are self-rotating and hydraulically rotated when the acid flows through the rotatable nozzles;
- and
- a position indicator selected from at least one of a gamma ray device and a casing collar locator;
- receiving location signals from the position indicator as the bailer tool assembly is sent down the well;
- positioning the bailer tool assembly at a downhole location based on the location signals;
- and
- activating the first piston to slide through the first fluid reservoir to push an acid out of the first fluid reservoir and through the plurality of rotatable nozzles.
A downhole tool assembly, comprising:
- a first bailer comprising a first fluid reservoir containing acid;
- a first piston positioned at an axial end of the first bailer and slidable through the first fluid reservoir;
- a first motor positioned proximate to and powering the first piston;
- a plurality of nozzles positioned at an opposite axial end of the first bailer from the first piston;
- a second bailer positioned on an opposite side of the first piston from the first bailer, the second bailer comprising a second fluid reservoir;
- a second piston positioned at an opposite axial end of the second bailer from the first piston;
- a second motor positioned proximate to and powering the second piston;
- at least one bypass line extending between and fluidly connected to the first fluid reservoir and the second fluid reservoir;
- and
- a position indicator selected from at least one of a gamma ray device and a casing collar locator.
Dependencies are inferred from the claim text.