Cementing equipment and control method

Abstract

A cementing equipment and a control method. The cementing equipment includes a centrifugal pump, a plunger pump, and a lubrication system. The lubrication system includes: a lubricating oil pump, including a first lubricating oil outlet and a second lubricating oil outlet; a first distribution valve, including a first inlet, at least one first outlet, and a third outlet, where the first outlet is communicated with a packing lubricating end of the centrifugal pump, the first lubricating oil outlet is communicated with the first inlet; and a second distribution valve, including a second inlet and at least one second outlet, where the second outlet is communicated with a packing lubricating end of the plunger pump, the second lubricating oil outlet is communicated with the second inlet or the second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet.

What is claimed is: 
     
         1 . A cementing system comprising a cementing equipment, the cementing equipment comprising a centrifugal pump, a plunger pump, and a lubrication system, wherein the lubrication system comprises:
 a lubricating oil pump, comprising a first channel and a second channel, a first lubricating oil outlet communicated with the first channel and a second lubricating oil outlet communicated with the second channel, wherein a first pump head is arranged in the first channel, and a second pump head is arranged in the second channel;   a first distribution valve, comprising a first inlet, at least one first outlet, and a third outlet, wherein the first inlet is communicated with the at least one first outlet, the first outlet is communicated with a packing lubricating end of the centrifugal pump, and the first lubricating oil outlet is communicated with the first inlet; and   a second distribution valve, comprising a second inlet and at least one second outlet, wherein the second inlet is communicated with the at least one second outlet, the second outlet is communicated with a packing lubricating end of the plunger pump, and the second lubricating oil outlet is communicated with the second inlet, or   the second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet.   
     
     
         2 . The cementing system according to  claim 1 , wherein:
 the lubricating oil pump further comprises an oil tank comprising a first oil return port;   the cementing equipment further comprises a first three-way valve comprising a first port, a second port, and a third port, the first port being communicated with the first outlet, the second port being communicated with the packing lubricating end of the centrifugal pump, and the third port being communicated with the first oil return port;   the first three-way valve has a first state and a second state;   when the first three-way valve is in the first state, the first port is communicated with the second port; and   when the first three-way valve is in the second state, the first port is communicated with the third port.   
     
     
         3 . The cementing system according to  claim 2 , wherein:
 the oil tank further comprises a second oil return port;   the cementing equipment further comprises a second three-way valve comprising a fourth port, a fifth port, and a sixth port, the fourth port being communicated with the second lubricating oil outlet or the third outlet, the fifth port being communicated with the second inlet, and the sixth port being communicated with the second oil return port;   the second three-way valve has a third state and a fourth state;   when the second three-way valve is in the third state, the fourth port is communicated with the fifth port; and   when the second three-way valve is in the fourth state, the fourth port is communicated with the sixth port.   
     
     
         4 . The cementing system comprising a plurality of cementing equipment of  claim 1  comprising a plurality of centrifugal pumps and a plurality of first outlets, the plurality of centrifugal pumps being in one-to-one correspondence to the plurality of first outlets, and each of the plurality of first outlets being communicated with the packing lubricating end of each of the plurality of centrifugal pumps. 
     
     
         5 . The cementing system according to  claim 4 , wherein:
 the first distribution valve further comprises at least two third outlets;   there are at least two second distribution valves;   there are at least two plunger pumps;   the third outlets, the second distribution valves, and the plunger pumps are in one-to-one correspondence; and   each of the third outlets is communicated with one of the second inlets.   
     
     
         6 . The cementing system according to  claim 1 , further comprising a first sensor arranged on the centrifugal pump; a second sensor arranged on the plunger pump; and an electronic control unit, wherein the first sensor and the second sensor both being electrically connected to the electronic control unit. 
     
     
         7 . The cementing system according to  claim 1 , further comprising an overflow valve and a pressure switch arranged at each of the first lubricating oil outlet and the second lubricating oil outlet, and/or a one-way valve arranged on a pipeline where the first outlet is communicated with the packing lubricating end of the centrifugal pump. 
     
     
         8 . The cementing system according to  claim 1 , wherein the packing lubricating end of the plunger pump comprises a plurality of lubricating points, and there are a plurality of third outlets, the plurality of lubricating points being in one-to-one correspondence to the plurality of third outlets, and the plurality of lubricating points being communicated with the plurality of third outlets. 
     
     
         9 . A method for controlling a cementing equipment, the cementing equipment comprising a centrifugal pump, a plunger pump, and a lubrication system, wherein:
 the lubrication system comprises:
 a lubricating oil pump, comprising a first channel, a first lubricating oil outlet communicated with the first channel, a second channel, and a second lubricating oil outlet communicated with the second channel, wherein a first pump head is arranged in the first channel, and a second pump head is arranged in the second channel; 
 a first distribution valve, comprising a first inlet, at least one first outlet, and a third outlet, wherein the first inlet is respectively communicated with the at least one first outlet, the first outlet is communicated with a packing lubricating end of the centrifugal pump, and the first lubricating oil outlet is communicated with the first inlet; and 
 a second distribution valve, comprising a second inlet and at least one second outlet, wherein the second inlet is respectively communicated with the at least one second outlet, the second outlet is communicated with a packing lubricating end of the plunger pump, and the second lubricating oil outlet is communicated with the second inlet, or 
 the second lubricating oil outlet is communicated with the first inlet, and the second inlet is communicated with the third outlet; and 
 the method comprises: 
 detecting whether the centrifugal pump operates; 
 controlling the first lubricating oil outlet of the lubricating oil pump to be open to provide the packing lubricating end of the centrifugal pump with lubricating oil when the centrifugal pump is in an operating state; 
 detecting whether the plunger pump operates; and 
 controlling the second lubricating oil outlet of the lubricating oil pump to be open to provide the packing lubricating end of the plunger pump with lubricating oil when the plunger pump is in an operating state. 
   
     
     
         10 . The method according to  claim 9 , wherein:
 the lubricating oil pump further comprises an oil tank comprising a first oil return port;   the cementing equipment further comprises a first three-way valve comprising a first port, a second port, and a third port, the first port being communicated with the first outlet, the second port being communicated with the packing lubricating end of the centrifugal pump, and the third port being communicated with the first oil return port;   the first three-way valve has a first state and a second state;   when the first three-way valve is in the first state, the first port is communicated with the second port;   when the first three-way valve is in the second state, the first port is communicated with the third port; and   the method further comprises:
 controlling the first three-way valve to be in the second state when the centrifugal pump is in an operation suspending state. 
   
     
     
         11 . The method according to  claim 10 , wherein:
 the oil tank further comprises a second oil return port;   the cementing equipment further comprises a second three-way valve comprising a fourth port, a fifth port, and a sixth port, the fourth port being communicated with the second lubricating oil outlet or the third outlet, the fifth port being communicated with the second inlet, and the sixth port being communicated with the second oil return port;   the second three-way valve has a third state and a fourth state;   when the second three-way valve is in the third state, the fourth port is communicated with the fifth port; and when the second three-way valve is in the fourth state, the fourth port is communicated with the sixth port; and   the method further comprises:
 controlling the second three-way valve to be in the fourth state when the plunger pump is in an operation suspending state.