US 11,078,769 B2 · Multi stage chemical injection

Abstract

Systems and method for injection a chemical into a wellbore. A chemical injection system may comprise a first valve, a chemical line, a pilot line, an injection line, and a backflow prevention valve disposable in the injection line. A production fluid recovery system may comprise a chemical injection system, a first valve, a pilot line, an injection line, a backflow prevention valve, a production tree, a wellhead, and production tubing. A method for actuating a valve in a chemical injection system may comprise pushing a fluid into a chemical line, pressurizing a pilot line to open a first valve, pushing the fluid through the first valve, increasing pressure in the pilot line to open a second valve, pushing the fluid through the second valve, pushing the fluid through a chemical line, and injecting fluid into a wellbore from the chemical line.

Claims20

Dependent claims

A chemical injection system comprising:

a first valve and a second valve;
a chemical line with first and second chemical branch lines connecting the chemical line to the first valve and the second valve, respectively, and operable to transport a fluid from a surface at a well site to the first valve and the second valve;
a pilot line and a plurality of pilot branch lines coupling the pilot line to the first valve and the second valve and operable to open and close the first valve and second valve for controlling flow of the fluid from the chemical line;
an injection line attachable to the first valve and operable to transport the fluid;
a backflow prevention valve disposable in the injection line;
and
a first flow restrictor disposable in the injection line and operable to restrict flow of the fluid.

4 more elements

A production fluid recovery system comprising:

a chemical injection system disposed in a wellbore comprising:
a first valve disposed downhole in a wellbore;
a chemical line attachable to the first valve and operable to transport a fluid from a surface to the first valve;
a pilot line directly attachable to the first valve and operable to flow a pressurized fluid from the surface to the first valve to open and close the first valve, wherein the chemical line and the pilot line are attached to a single source at the surface, so that the pressurized fluid used to open the first valve is from the same single source as the fluid that flows through the open first valve, and wherein the chemical line and pilot line are branches of a single line running from the surface down through an annulus of the wellbore;
an injection line attachable to the first valve and operable to transport the fluid;
and a first flow restrictor operable to restrict flow of the fluid;
a backflow prevention valve disposable in the injection line;
and
a production tree;
a wellhead;
and
a production tubing coupled to the production tree and at least partially disposed in the wellbore.

9 more elements

Dependencies are inferred from the claim text.

Multi stage chemical injection

Life of this patent

Multi stage chemical injection

Life of this patent

Abstract

Claims20