公开(公告)号：US20180142533A1

公开(公告)日：2018-05-24

申请号：US15799176

申请日：2017-10-31

Applicant: WEATHERFORD TECHNOLOGY HOLDINGS, LLC

Inventor： Sven C. JOERPELAND ,  Kaj STOKKELAND ,  Brian M. STERNAMAN ,  Zlatko X. SALIHBEGOVIC

IPC: E21B34/10 ,  F16K47/04

CPC classification number: E21B34/10 ,  E21B34/063 ,  E21B37/06 ,  E21B41/02 ,  F16K17/0466 ,  F16K17/162 ,  F16K17/40 ,  F16K17/403 ,  F16K47/04

Abstract: A chemical injection valve can include a valve stem reciprocably disposed relative to a primary seal, and a variable flow restrictor upstream of the primary seal relative to a direction of flow through the chemical injection valve. The variable flow restrictor restricts the flow when the valve stem is disengaged from the primary seal. A chemical injection system can include a chemical treatment pumped through a chemical injection valve and into an interior of a tubular string in a well, the chemical injection valve including a valve stem, a primary seal sealingly engaged with the valve stem in a closed position and disengaged from the valve stem in an open position, and a flow restrictor that restricts the flow of the chemical treatment downstream from the primary seal in the open position.