Wellbore chemical injection with an adaptor flange

Abstract

Devices and methods for wellbore chemical injection with an adaptor flange is provided. In one aspect, an adaptor flange includes a body. The body defines a through opening. The body includes a first portion terminating at a first end of the adaptor flange and defining a first inner diameter of the through opening. The first portion includes a valve removal (VR) plug profile. The body includes a second portion terminating at a second end of the adaptor flange and defining a second inner diameter of the through opening smaller than the first inner diameter. The body further includes a neck portion connecting the first portion to the second portion. An inner diameter transitions from the first inner diameter to the second inner diameter along a longitudinal length of the neck portion. An outer dimension of the first portion is greater than an outer dimension of the second portion.

1 . A wellbore chemical injection assembly, comprising:
 an adaptor flange comprising a body defining a through opening, the body comprising:
 a first portion terminating at a first end of the adaptor flange and defining a first inner diameter of the through opening, the first portion comprising a valve removal (VR) plug profile; 
 a second portion terminating at a second end of the adaptor flange and defining a second inner diameter of the through opening smaller than the first inner diameter of the through opening; and 
 a neck portion connecting the first portion to the second portion, wherein an inner diameter of the through opening transitions from the first inner diameter to the second inner diameter along a longitudinal length of the neck portion, 
   wherein an outer dimension of the first portion is greater than an outer dimension of the second portion; and   a VR plug configured to be installed in the adaptor flange such that, together with the adaptor flange, the VR plug serves, with the VR plug engaged with the VR plug profile, as a fluid barrier that allows removing a valve from the first portion of the adaptor flange,   wherein the first portion of the adaptor flange defines a plurality of first holes evenly spaced in a first circle, the second portion of the adaptor flange defines a plurality of second holes evenly spaced in a second circle, and wherein a diameter of the first circle is greater than a diameter of the second circle.   
     
     
         2 . The adaptor flange of  claim 1 , wherein the adaptor flange comprises a single, unitary structure. 
     
     
         3 . The adaptor flange of  claim 1 , wherein the outer dimension of the first portion is a maximum distance between two opposite outer edges of the first portion, and the outer dimension of the second portion is a maximum distance between two opposite outer edges of the second portion. 
     
     
         4 . The adaptor flange of  claim 3 , wherein each of the first portion and the second portion has a circular shape, and wherein the outer dimension of the first portion is an outer diameter of the first portion, and the outer dimension of the second portion is an outer diameter of the second portion. 
     
     
         5 . (canceled) 
     
     
         6 . The adaptor flange of claim  5 , wherein the first holes are configured to receive first bolts that couple the adaptor flange to a gate valve configured to be fluidically coupled to a chemical reservoir. 
     
     
         7 . The adaptor flange of claim  5 , wherein the second holes are configured to receive second bolts that couple the adaptor flange to a tubing spool inlet of a wellhead installed at a surface of a wellbore formed through a subterranean zone. 
     
     
         8 . The adaptor flange of  claim 1 , wherein the VR plug profile is configured to receive the VR plug. 
     
     
         9 . A wellbore chemical injection assembly, comprising:
 an adaptor flange comprising a body defining a through opening, the body comprising:
 a first portion terminating at a first end of the adaptor flange and defining a first inner diameter of the through opening, the first portion comprising a valve removal (VR) plug profile; 
 a second portion terminating at a second end of the adaptor flange and defining a second inner diameter of the through opening smaller than the first inner diameter of the through opening; and 
 a neck portion that connects the first portion to the second portion, wherein an inner diameter of the through opening transitions from the first inner diameter to the second inner diameter along a longitudinal length of the neck portion, 
   wherein an outer dimension of the first portion is greater than an outer dimension of the second portion; and   a check valve configured to be installed in the adaptor flange and comprising an exterior plug profile that engages with the VR plug profile of the adaptor flange, wherein the VR plug profile is based on an American Petroleum Institute (API) standard.   
     
     
         10 . The wellbore chemical injection assembly of  claim 9 , wherein the outer dimension of the first portion is a maximum distance between two opposite outer edges of the first portion, and the outer dimension of the second portion is a maximum distance between two opposite outer edges of the second portion. 
     
     
         11 . The wellbore chemical injection assembly of  claim 10 , wherein each of the first portion and the second portion has a circular shape, and wherein the outer dimension of the first portion is an outer diameter of the first portion, and the outer dimension of the second portion is an outer diameter of the second portion. 
     
     
         12 . The wellbore chemical injection assembly of  claim 9 , wherein the check valve is configured to be removably installed within the adaptor flange. 
     
     
         13 . The wellbore chemical injection assembly of  claim 9 , wherein the first portion of the adaptor flange defines a plurality of first holes evenly spaced in a first circle, the second portion of the adaptor flange defines a plurality of second holes evenly spaced in a second circle, and wherein a diameter of the first circle is greater than a diameter of the second circle. 
     
     
         14 . A method, comprising:
 providing an adaptor flange comprising a body defining a through opening, the body comprising:
 a first portion terminating at a first end of the adaptor flange and defining a first inner diameter of the through opening, the first portion comprising a valve removal (VR) plug profile; 
 a second portion terminating at a second end of the adaptor flange and defining a second inner diameter of the through opening smaller than the first inner diameter of the through opening; and 
 a neck portion that connects the first portion to the second portion, wherein an inner diameter transitions from the first inner diameter to the second inner diameter along a longitudinal length of the neck portion, 
 wherein an outer dimension of the first portion is greater than an outer dimension of the second portion; 
   coupling the first portion of the adaptor flange to a first gate valve configured to be fluidically coupled to a chemical reservoir;   coupling the second portion of the adaptor flange to a tubing spool inlet of a wellhead installed at a surface of a wellbore formed through a subterranean zone;   injecting chemicals through the first gate valve and the adaptor flange into the tubing spool inlet;   installing a first check valve in the tubing spool inlet of the wellhead; and   installing a second check valve in the adaptor flange.   
     
     
         15 . The method of  claim 14 , wherein coupling the second portion of the adaptor flange to the tubing spool inlet of the wellhead comprises:
 coupling the second portion of the adaptor flange to a second gate valve; and   coupling the second gate valve to the tubing spool inlet of the wellhead.   
     
     
         16 . (canceled) 
     
     
         17 . (canceled) 
     
     
         18 . (canceled) 
     
     
         19 . The method of  claim 14 , comprising:
 removing the first check valve from the tubing spool inlet of the wellhead;   installing a first VR plug in the tubing spool inlet of the wellhead; and   performing an inflow test to assess effectiveness of isolation provided by the first VR plug.   
     
     
         20 . (canceled) 
     
     
         21 . The wellbore chemical injection assembly of  claim 1 , further comprising a gate valve coupled with the first portion of the adaptor flange such that, with the VR plug detached from the adaptor flange, the adaptor flange allows a fluid to be injected through the gate valve and the adaptor flange, into a wellhead coupled with the adaptor flange. 
     
     
         22 . The wellbore chemical injection assembly of  claim 9 , wherein the check valve is configured to be installed in the adaptor flange such that, together with the adaptor flange, the check valve serves, with the check valve coupled with the adaptor flange profile, as a fluid barrier that allows removing a valve from the first portion of the adaptor flange. 
     
     
         23 . The wellbore chemical injection assembly of  claim 22 , further comprising a gate valve coupled with the first portion of the adaptor flange such that, with the check valve detached from the adaptor flange, the adaptor flange allows a fluid to be injected through the gate valve and the adaptor flange, into a wellhead coupled with the adaptor flange. 
     
     
         24 . An adaptor flange, comprising:
 a body defining a through opening, the body comprising:   a first portion terminating at a first end of the adaptor flange and defining a first inner diameter of the through opening, the first portion comprising a valve removal (VR) plug profile adapted to receive a VR plug such that, together with VR plug, the adaptor flange serves, with the VR plug engaged with the VR plug profile, as a fluid barrier that allows at least one of (i) attaching a valve to the first portion of the adaptor flange, or (ii) removing a valve from the first portion of the adaptor flange;   a second portion terminating at a second end of the adaptor flange and defining a second inner diameter of the through opening smaller than the first inner diameter of the through opening; and   a neck portion connecting the first portion to the second portion, wherein an inner diameter of the through opening transitions from the first inner diameter to the second inner diameter along a longitudinal length of the neck portion,   wherein an outer dimension of the first portion is greater than an outer dimension of the second portion.   
     
     
         25 . The adaptor flange of  claim 24 , wherein the first portion is coupled with a gate valve such that, with the VR plug detached from the adaptor flange, the body allows a fluid to be injected through the gate valve and the body, into a wellhead coupled with the body.