Wellhead assembly for injecting a fluid into a well and method of using the same

Abstract

A wellhead assembly comprises an outer housing having a central bore therethrough and an inner housing having a central bore therethrough secured in the central bore of the outer housing. The inner housing has a first end within the outer housing. A first inner casing having a central bore therethrough is secured at a first end in the outer housing and spaced from the first end of the inner housing. A port is provided through the outer housing in communication with the central bore therethrough, the port opening into the central bore of the outer housing between the first end of the inner housing and the first end of the first inner casing. A second inner casing is secured in the wellhead assembly at a first end, whereby the port opens into the central bore of the outer housing between the first end of the first inner housing and the first end of the second inner housing. An annulus is formed between the first and second inner casings. A flowpath for fluid injection into a well in which the wellhead assembly is installed comprises the port in the outer housing and the annulus between the first and second inner casings. A method for injecting fluid into the wellhead assembly and the well along the aforementioned flowpath is also provided. The wellhead assembly and method are particularly suitable for the injection of a slurry of drilling cuttings into the well and underground formations into which the well extends.

Dependencies are inferred from the claim text.