Hydraulic jar and a flow control device usable in the hydraulic jar

摘要

A hydraulic jar comprising a housing and a mandrel slidably disposed in the housing forming an annular space therebetween. In an embodiment, the hydraulic jar comprises a flow control device fixedly connected to the mandrel and disposed in the annular space to divide the annular space into a first portion and a second portion. The flow control device comprises an annular member slidably positioned about the mandrel, wherein the annular member comprises a face, an inside surface, and an outside surface, wherein the outside surface of the annular member is disposed against an inside surface of the tubular housing, wherein the outer surface of the annular member and the inside surface of the tubular housing allow fluid flow therebetween at a first flow rate, wherein the inside surface of the annular member and the retaining surface of the retaining assembly allow fluid flow therebetween at a second flow rate.

主权项

1. A hydraulic jar usable for creating a shock in a downhole string, the hydraulic jar comprising:
a tubular housing; a mandrel disposed in the housing forming an annular space therebetween; and a flow control device fixedly connected to the mandrel and disposed in the annular space to divide the annular space into a first portion and a second portion, wherein the flow control device comprises:
a retaining device fixedly connected to the mandrel, wherein the retaining device comprises a first shoulder and a second shoulder to define a first surface extending longitudinally between the first shoulder and the second shoulder; andat least one sleeve slidably positioned about the first surface between the first shoulder and the second shoulder, wherein the at least one sleeve comprises a first end, a second end, and an outer surface between the first end and the second end, wherein the flow control device allows a fluid to flow between the tubular housing and the at least one sleeve at a first rate of flow when the mandrel is moving in a first direction relative to the tubular housing, wherein the first end of the at least one sleeve forms a fluid seal against the first shoulder when the mandrel is moving in the first direction, and wherein the flow control device allows a fluid to flow between the first surface and the at least one sleeve at a second rate of flow when the mandrel is moving in a second direction relative to the tubular housing, wherein the first rate of flow is different from the second rate of flow.