Patent ID: 11867015
Assignee: NATIONAL OILWELL VARCO, L.P.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 22:
23. A friction reduction system deployable in a wellbore, comprising:
a housing comprising a central axis and defining a central passage extending through the housing;
a valve disposed in the housing and comprising a first valve body and a second valve body, wherein the first valve body is permitted to rotate relative to the second valve body;
a mandrel coupled to the second valve body and permitted to travel axially relative to the housing; and
a biasing member configured to apply a biasing force against the mandrel;
wherein the mandrel is stroked in a first axial direction in response to applying a first net pressure force generated by a drilling fluid against the mandrel when the valve is transitioned from a closed configuration to an open configuration, wherein the first net pressure force is generated by a drilling fluid flowing through the valve; and
wherein the biasing member is configured to stroke the mandrel in a second axial direction that is opposite the first axial direction when the valve is transitioned from the open configuration to the closed configuration whereby a second net pressure force is applied against the mandrel, wherein the second net pressure force is generated by wellbore fluid in an annulus formed in the wellbore surrounding the housing.