A fluid end (15) for a multiple reciprocating pump assembly (12) includes at least three plunger bores (61) or (91) each for receiving a reciprocating plunger (35), each plunger bore having a plunger bore axis (65) or (95). The fluid end (15) includes suction valve bores (59) or (89), each suction v
A fluid end (15) for a multiple reciprocating pump assembly (12) includes at least three plunger bores (61) or (91) each for receiving a reciprocating plunger (35), each plunger bore having a plunger bore axis (65) or (95). The fluid end (15) includes suction valve bores (59) or (89), each suction valve bore receiving a suction valve (41) and having a suction valve bore axis (63) or (93), and the fluid end further includes discharge valve bores (57) or (87), each discharge valve bore receiving a discharge valve (43) and having a discharge valve bore axis (63) or (93). The axes of at least one of the suction and discharge valve bores is inwardly offset in the fluid end from its respective plunger bore axis.
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1. A method of cementing, acidizing, or fracturing a subterranean well during oilfield operations, the method comprising: conveying a fluid into a pump chamber formed in a fluid end having opposing first and second side portions horizontally spaced from each other, wherein the fluid is conveyed via
1. A method of cementing, acidizing, or fracturing a subterranean well during oilfield operations, the method comprising: conveying a fluid into a pump chamber formed in a fluid end having opposing first and second side portions horizontally spaced from each other, wherein the fluid is conveyed via a first flowpath that is located below the pump chamber and defines a first longitudinal center axis extending between opposite ends of the first flowpath;pressurizing the fluid within the pump chamber, comprising reciprocatingly driving a plunger in the pump chamber along a second longitudinal center axis that is perpendicular to the first longitudinal center axis; andconveying the pressurized fluid out of the pump chamber via a second flowpath that is located above the pump chamber, is opposed to the first flowpath, and defines a third longitudinal center axis that is perpendicular to the second longitudinal center axis and extends between opposite ends of the second flowpath;wherein reciprocatingly driving the plunger along the second longitudinal center axis comprises moving the plunger away from the pump chamber;wherein conveying the fluid into the pump chamber via the first flowpath comprises actuating, to a first open position, a first valve located in the first flowpath and thus below the pump chamber;wherein the first valve located below the pump chamber is actuated to the first open position in response to moving the plunger away from the pump chamber, the movement of the plunger away from the pump chamber creating a pressure differential across the first valve so that a first pressure in a portion of the first flowpath vertically located below the first valve in its entirety is greater than a second pressure in at least a portion of the pump chamber vertically located above the first valve in its entirety;wherein the at least the portion of the pump chamber in which the second pressure is located is vertically spaced, in a first vertical direction, from the portion of the first flowpath in which the first pressure is located;wherein actuating the first valve located below the pump chamber to the first open position allows the fluid to enter the pump chamber via the first flowpath;wherein reciprocatingly driving the plunger along the second longitudinal center axis further comprises moving the plunger toward the pump chamber;wherein conveying the pressurized fluid out of the pump chamber via the second flowpath comprises actuating, to a second open position, a second valve that is located in the second flowpath and thus above the pump chamber, and that is opposed to the first valve located in the first flowpath and below the pump chamber;wherein the second valve located above the pump chamber is actuated to the second open position in response to moving the plunger toward the pump chamber;wherein actuating the second valve located above the pump chamber to the second open position allows the fluid to exit the pump chamber via the second flowpath;wherein: the second longitudinal center axis, along which the plunger is reciprocatingly driven, is horizontally spaced from the first longitudinal center axis defined by the first flowpath; the third longitudinal center axis defined by the second flowpath is coaxial with the first longitudinal center axis defined by the first flowpath; the first and second valves, which are located in the first and second flowpaths, respectively, lie on the coaxial first and third longitudinal axes; and a plunger horizontal spacing is defined between the second longitudinal center axis, along which the plunger is reciprocatingly driven, and both of the coaxial third and first longitudinal center axes defined by the second and first flowpaths, respectively;wherein the second valve is located vertically above the first valve so that the second valve is vertically spaced from the first valve in a second vertical direction, the second vertical direction being the same as the first vertical direction;wherein the plunger horizontal spacing, which is defined between the second longitudinal center axis along which the plunger is reciprocatingly driven, andboth of the coaxial first and third longitudinal center axes,is such that the second longitudinal center axis is horizontally spaced from both of the coaxial first and third longitudinal center axes in a first horizontal direction;wherein the first horizontal direction, in which the second longitudinal center axis is horizontally spaced from both of the coaxial first and third longitudinal center axes, is perpendicular to both the first vertical direction, in which the at least the portion of the pump chamber in which the second pressure is located is vertically spaced from the portion of the first flowpath in which the first pressure is located, and the second vertical direction, in which the second valve is vertically spaced from the first valve; andwherein: the coaxial first and third longitudinal center axes and the first and second flowpaths including said ends thereof are located horizontally between: the second longitudinal center axis along which the plunger is reciprocatingly driven, andan additional longitudinal center axis along which an additional plunger is adapted to be reciprocatingly driven, the additional longitudinal center axis being spaced in a parallel relation from the second longitudinal center axis and being located horizontally between the second side portion and the second longitudinal center axis,the second longitudinal center axis along which the plunger is reciprocatingly driven is located closer to the first side portion of the fluid end than the second side portion, anda first horizontal distance between the first side portion and both of the coaxial first and third longitudinal center axes is greater than a second horizontal distance between the first side portion and the second longitudinal center axis. 2. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 1, further comprising delivering the pressurized fluid from the second flowpath to a wellbore to cement, acidize, or fracture the subterranean well. 3. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 1, wherein pressurizing the fluid within the pump chamber further comprises actuating, to a first closed position, the first valve located below the pump chamber to prevent the fluid from exiting the pump chamber via the first flowpath. 4. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 1, wherein, during moving the plunger toward the pump chamber, the plunger is located within the pump chamber, the first valve is located below the plunger, and the second valve is located above the plunger, so that the plunger is located between the first and second valves. 5. A method of cementing, acidizing, or fracturing a subterranean well during oilfield operations, the method comprising: conveying a fluid into a pump chamber formed in a fluid end having opposing first and second side portions horizontally spaced from each other, wherein the fluid is conveyed via a first flowpath that is located below the pump chamber and defines a first longitudinal center axis extending between opposite ends of the first flowpath;pressurizing the fluid within the pump chamber, comprising reciprocatingly driving a plunger in the pump chamber along a second longitudinal center axis that is perpendicular to the first longitudinal center axis; andconveying the pressurized fluid out of the pump chamber via a second flowpath that is located above the pump chamber, is opposed to the first flowpath, and defines a third longitudinal center axis that is perpendicular to the second longitudinal center axis and extends between opposite ends of the second flowpath;wherein the second longitudinal center axis is horizontally spaced from the first longitudinal center axis defined by the first flowpath; the third longitudinal center axis is coaxial with the first longitudinal center axis; and a plunger horizontal spacing is defined between the second longitudinal center axis and both of the coaxial third and first longitudinal center axes; andwherein: the coaxial first and third longitudinal center axes and the first and second flowpaths including said ends thereof are located horizontally between: the second longitudinal center axis, andan additional longitudinal center axis along which an additional plunger is adapted to be reciprocatingly driven, the additional longitudinal center axis being spaced in a parallel relation from the second longitudinal center axis and being located horizontally between the second side portion and the second longitudinal center axis,the second longitudinal center axis is located closer to the first side portion of the fluid end than the second side portion, anda first horizontal distance between the first side portion and both of the coaxial first and third longitudinal center axes is greater than a second horizontal distance between the first side portion and the second longitudinal center axis. 6. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 5, further comprising delivering the pressurized fluid from the second flowpath to a wellbore to cement, acidize, or fracture the subterranean well. 7. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 5, wherein conveying the fluid into the pump chamber via the first flowpath comprises actuating, to a first open position, a first valve located in the first flowpath; and wherein conveying the pressurized fluid out of the pump chamber via the second flowpath comprises actuating, to a second open position, a second valve that is located in the second flowpath, and that is opposed to the first valve located in the first flowpath. 8. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 7, wherein pressurizing the fluid within the pump chamber further comprises actuating, to a first closed position, the first valve located below the pump chamber to prevent the fluid from exiting the pump chamber via the first flowpath. 9. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 7, wherein reciprocatingly driving the plunger along the second longitudinal center axis comprises moving the plunger away from the pump chamber; and wherein the first valve located below the pump chamber is actuated to the first open position in response to moving the plunger away from the pump chamber. 10. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 9, wherein the movement of the plunger away from the pump chamber creates a pressure differential across the first valve so that a first pressure in a portion of the first flowpath vertically located below the first valve in its entirety is greater than a second pressure in at least a portion of the pump chamber vertically located above the first valve in its entirety. 11. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 7, wherein actuating the first valve located below the pump chamber to the first open position allows the fluid to enter the pump chamber via the first flowpath; and wherein actuating the second valve located above the pump chamber to the second open position allows the fluid to exit the pump chamber via the second flowpath. 12. A method of cementing, acidizing, or fracturing a subterranean well during oilfield operations, the method comprising: conveying a fluid into a pump chamber formed in a fluid end having opposing first and second side portions horizontally spaced from each other, wherein the fluid is conveyed via a first flowpath that is located below the pump chamber and defines a first longitudinal center axis extending between opposite ends of the first flowpath;pressurizing the fluid within the pump chamber, comprising reciprocatingly driving a plunger in the pump chamber along a second longitudinal center axis that is perpendicular to the first longitudinal center axis; andconveying the pressurized fluid out of the pump chamber via a second flowpath that is located above the pump chamber, is opposed to the first flowpath, and defines a third longitudinal center axis that is perpendicular to the second longitudinal center axis and extends between opposite ends of the second flowpath;wherein the second longitudinal center axis is horizontally spaced from at least one of the first and third longitudinal center axes defined by the first and second flowpaths, respectively, such that a plunger horizontal spacing is defined between the second longitudinal center axis and the at least one of the third and first longitudinal center axes; andwherein: the at least one of the first and third longitudinal center axes and the corresponding one of the first and second flowpaths including said ends thereof are located horizontally between: the second longitudinal center axis, andan additional longitudinal center axis along which an additional plunger is adapted to be reciprocatingly driven, the additional longitudinal center axis being spaced in a parallel relation from the second longitudinal center axis and being located horizontally between the second side portion and the second longitudinal center axis,the second longitudinal center axis is located closer to the first side portion of the fluid end than the second side portion, anda first horizontal distance between the first side portion and the at least one of the first and third longitudinal center axes is greater than a second horizontal distance between the first side portion and the second longitudinal center axis. 13. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 12, further comprising delivering the pressurized fluid from the second flowpath to a wellbore to cement, acidize, or fracture the subterranean well. 14. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 12, wherein conveying the fluid into the pump chamber via the first flowpath comprises actuating, to a first open position, a first valve located in the first flowpath; and wherein conveying the pressurized fluid out of the pump chamber via the second flowpath comprises actuating, to a second open position, a second valve that is located in the second flowpath, and that is opposed to the first valve located in the first flowpath. 15. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 14, wherein pressurizing the fluid within the pump chamber further comprises actuating, to a first closed position, the first valve located below the pump chamber to prevent the fluid from exiting the pump chamber via the first flowpath. 16. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 14, wherein reciprocatingly driving the plunger along the second longitudinal center axis comprises moving the plunger away from the pump chamber; and wherein the first valve located below the pump chamber is actuated to the first open position in response to moving the plunger away from the pump chamber. 17. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 16, wherein the movement of the plunger away from the pump chamber creates a pressure differential across the first valve so that a first pressure in a portion of the first flowpath vertically located below the first valve in its entirety is greater than a second pressure in at least a portion of the pump chamber vertically located above the first valve in its entirety. 18. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 14, wherein actuating the first valve located below the pump chamber to the first open position allows the fluid to enter the pump chamber via the first flowpath. 19. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 14, wherein reciprocatingly driving the plunger along the second longitudinal center axis comprises moving the plunger toward the pump chamber; and wherein the second valve located above the pump chamber is actuated to the second open position in response to moving the plunger toward the pump chamber. 20. The method of cementing, acidizing, or fracturing the subterranean well during oilfield operations of claim 14, wherein actuating the second valve located above the pump chamber to the second open position allows the fluid to exit the pump chamber via the second flowpath.
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