Fluid end with threaded dynamic section

Abstract

A high-pressure hydraulic fracturing pump. The pump is in-line in orientation, with a static section having a high-pressure discharge chamber and a dynamic section having a dynamic internal bore threaded to the static section. A fluid routing plug is disposed within a bore which includes the dynamic internal bore. The pump is designed for ease of access and for reducing wear. Large, external threads on the dynamic section pair with internal threads on the static section to reduce wear associated with repeated pressurization of hydraulic fracturing fluid found within the pump. Seals and wear rings are found at a nose of the dynamic section to further prevent wear and damage.

1 . A high-pressure pump, comprising:
 a fluid end body, comprising:
 a static section comprising at least one internal flow bore having internally-disposed threads; and 
 a dynamic section comprising a dynamic internal flow bore, the dynamic section having external threads disposed about an external surface of the dynamic section; 
 wherein the dynamic section is configured for threaded attachment to the static section such that the at least one internal flow bore and the dynamic internal flow bore are aligned. 
   
     
     
         2 . The high-pressure pump of  claim 1  further comprising:
 a plunger system installed within the dynamic internal flow bore, comprising:
 a packing; 
 a plunger, partially disposed within the packing; and 
 a threaded packing nut disposed about the plunger and configured to retain the packing in the dynamic internal flow bore. 
 
 
     
     
         3 . The high-pressure pump of  claim 2  further comprising:
 a retainer affixed to the dynamic section and configured to retain the threaded packing nut within the dynamic internal flow bore. 
 
     
     
         4 . The high pressure pump of  claim 3  in which the retainer is affixed to the dynamic section by a plurality of studs. 
     
     
         5 . The high pressure pump of  claim 3  in which the threaded packing nut is threaded to an internal surface of the retainer. 
     
     
         6 . The high pressure pump of  claim 1  further comprising:
 an inlet manifold, in communication with the internal flow bore of the static section; 
 an outlet manifold, in communication with the internal flow bore of the static section; and 
 a fluid routing plug disposed within the internal flow bore, the fluid routing plug having a suction surface and a discharge surface and defining:
 a first fluid flow path from the inlet manifold, through the fluid routing plug, to the suction surface; and 
 a second fluid flow path from the suction surface to the discharge surface. 
 
 
     
     
         7 . The high pressure pump of  claim 6  further comprising:
 a suction valve disposed within the dynamic internal flow bore and configured to cover the first fluid flow path at the suction surface; and 
 a discharge valve disposed within the static section and configured to cover the second fluid flow path at the discharge surface. 
 
     
     
         8 . The high pressure pump of  claim 1  further comprising a discharge manifold, the discharge manifold attached to the static section and comprising:
 a first discharge conduit, the first discharge conduit extending from the static section and comprising:
 a first flange; 
 a boss extending from the first flange; and 
 a second flange, disposed on the discharge conduit at an end opposite the first flange, in which:
 the boss extends into a counterbore formed on the static section and; 
 the first flange is attached to the static section with a plurality of bolts. 
 
 
 
     
     
         9 . The high pressure pump of  claim 8  in which the discharge manifold further comprises:
 a manifold body having a plurality of inlet ports, the manifold body comprising a plurality of third flanges, each disposed about each of the plurality of inlet ports; and 
 a clamp joint, joining one of the plurality of third flanges to the second flange of the discharge conduit. 
 
     
     
         10 . The high pressure pump of  claim 1  in which the first discharge conduit is located above the static section, and further comprising:
 a second discharge conduit, the second discharge conduit extending from and being located below the static section and comprising:
 a first flange; 
 a boss extending from the first flange; and 
 a second flange, disposed on the discharge conduit at an end opposite the first flange, in which:
 the boss extends into a counterbore formed on the static section and; 
 the first flange is attached to the static section with a plurality of bolts. 
 
 
 
     
     
         11 . The high pressure pump of  claim 10  in which the discharge manifold further comprises:
 a top manifold body having a plurality of inlet ports, the top manifold body comprising a plurality of third flanges, each disposed about each of the plurality of inlet ports of the top manifold body; 
 a bottom manifold body having a plurality of inlet ports, the bottom manifold body comprising a plurality of fourth flanges, each disposed about each of the plurality of inlet ports of the bottom manifold body; 
 a first clamp joint, joining one of the plurality of third flanges to the second flange of the first discharge conduit; and 
 a second clamp joint, joining one of the plurality of fourth flanges to the second flange of the second discharge conduit. 
 
     
     
         12 . The high pressure pump of  claim 1  in which the static section comprises five internal flow bores. 
     
     
         13 . The high pressure pump of  claim 12  wherein five dynamic sections are threaded to the static section at corresponding internal flow bores. 
     
     
         14 . The high pressure pump of  claim 1  wherein the dynamic section comprises a front section extending into the static section further than the external threads of the dynamic section. 
     
     
         15 . The high pressure pump of  claim 14  further comprising an axial face seal disposed in the static section and contacting a front surface of the front section of the dynamic section. 
     
     
         16 . The high pressure pump of  claim 14  further comprising at least one radial seal disposed in the static section and contacting an outside surface of the front section of the dynamic section. 
     
     
         17 . The high pressure pump of  claim 16  further comprising an axial face seal disposed in the static section and contacting a front surface of the front section of the dynamic section. 
     
     
         18 . The high pressure pump of  claim 14  wherein the front section of the dynamic section comprises a chamfered nose. 
     
     
         19 . The high pressure pump of  claim 14  further comprising:
 a fluid routing plug disposed within the static section and configured to route fluid from a fluid inlet into the dynamic internal flow bore and, thereafter, across the fluid routing plug to a fluid outlet; and 
 an insert disposed between the fluid routing plug and a shoulder of the front section of the dynamic section. 
 
     
     
         20 . The high pressure pump of  claim 19  in which the internal flow bore is closed by a threaded front retainer. 
     
     
         21 . The high pressure pump of  claim 20 , further comprising:
 a suction valve configured to seal a first side of the fluid routing plug;   a discharge valve configured to seal a second side of the fluid routing plug, in which the discharge valve comprises a stem; and   a discharge plug seated in the threaded front retainer, the discharge plug having a blind hole configured to receive the stem of the discharge valve.   
     
     
         22 . The high pressure pump of  claim 21  further comprising a discharge plug insert disposed within the blind hole of the discharge plug, the discharge plug insert disposed about the stem. 
     
     
         23 . The high-pressure pump of  claim 22  further comprising:
 a plunger system installed within the dynamic internal flow bore, comprising:
 a packing; 
 a plunger, partially disposed within the packing; and 
 a threaded packing nut disposed about the plunger and configured to retain the packing in the dynamic internal flow bore. 
 
 
     
     
         24 . The high-pressure pump of  claim 23  further comprising a power end, wherein reciprocation of the plunger within the dynamic internal flow bore is driven by the power end.