CA2382668C - Fluid driven mud pump - Google Patents
Fluid driven mud pump Download PDFInfo
- Publication number
- CA2382668C CA2382668C CA2382668A CA2382668A CA2382668C CA 2382668 C CA2382668 C CA 2382668C CA 2382668 A CA2382668 A CA 2382668A CA 2382668 A CA2382668 A CA 2382668A CA 2382668 C CA2382668 C CA 2382668C
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- Prior art keywords
- mud
- cylinder
- mud cylinder
- pump
- piston
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- Expired - Lifetime
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- 239000012530 fluid Substances 0.000 title claims abstract description 107
- 239000007788 liquid Substances 0.000 claims abstract description 28
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 238000005553 drilling Methods 0.000 claims description 14
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 230000010349 pulsation Effects 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04B15/02—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts the fluids being viscous or non-homogeneous
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/01—Arrangements for handling drilling fluids or cuttings outside the borehole, e.g. mud boxes
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B11/00—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B11/005—Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation using two or more pumping pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
- F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
- F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
- F04B9/111—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members
- F04B9/113—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers with two mechanically connected pumping members reciprocating movement of the pumping members being obtained by a double-acting liquid motor
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
A fluid driven mud pump with a pump body including a fluid drive cylinder axially aligned with a first mud cylinder and a second mud cylinder. The fluid drive cylinder has a first end, a second end, and a double acting reciprocating piston with a first end of the piston positioned in the first mud cylinder and a second end of the piston positioned in the second mud cylinder. As the first end of the piston forces liquid from the first mud cylinder, liquid is concurrently drawn into the second mud cylinder. As the second end of the piston forces liquid from the second mud cylinder, liquid is concurrently drawn the first mud cylinder. In order to further reduce pressure pulsations a group of pump bodies are formed into a single pumping unit with each of the pump bodies operating out of phase to provide a constant sequential discharge.
Description
TITLE OF THE INVENTION:
Fluid Driven Mud Pump FIELD OF THE INVENTION
The present invention relates to a fluid driven mud pump used to pump drilling fluids when earth drilling BACKGROUND OF THE INVENTION
Fluid driven mud pumps presently in use in the oil and gas drilling industry consist crankshaft driven pistons which reciprocate in cylinders. The mud pumps come in duplex and triplex versions.
Triplex mud pumps have three cylinders which alternatively discharge drilling fluids into a flow line. Each cylinder discharges on the forward stroke, and does not create fluid movement on the backward stroke.
Duplex mud pumps have two cylinders which alternatively discharge drilling fluids into a flow line. Each cylinder discharges on both the forward stroke and on the backward stroke. A greater quantity of fluid is pumped on the forward stroke as compared to the back stroke. On the forward stroke the full face of the piston acts against fluid within the cylinder, whereas on the backward stroke the face area of the piston acting upon the fluid within the cylinder is reduced by the diameter of the piston rod. This creates a pressure pulse as the piston shifts between the forward stroke and the backward stroke.
SiTHIIKARY OF THE INVENTION
The present invention is an alternative configuration of fluid driven mud pumps.
According to the present invention there is provided a fluid driven mud pump; the pump body including a fluid drive cylinder axially aligned with a first mud cylinder and a second mud cylinder. The first mud cylinder has a first end, a second end, a first inlet and a first outlet. The first inlet and the first outlet are both positioned toward the first end. The second mud cylinder has a first end, a second end, a second inlet and a second outlet. The second inlet and the second outlet are both positioned toward the second end. The fluid drive cylinder has a first end, a second end, and a double acting reciprocating piston. The fluid drive cylinder is coupled with the second end of the first mud cylinder and the first end of the second mud cylinder. The first end of the piston is positioned in the first mud cylinder. The second end of the piston is positioned in the second mud cylinder. As the first end of the piston forces liquid from the first outlet of the first mud cylinder, liquid is concurrently being drawn through the second inlet into the second mud cylinder. As the second end of the piston forces liquid from the second outlet of the second mud cylinder, liquid is concurrently being drawn through the first inlet into the first mud cylinder.
With the fluid driven mud pump, as described above, the fluid discharged by the forward stroke is substantially the same as the fluid discharged by the backward stroke. There is not a cessation of pumping nor a reduction in output on the backstroke, as with the prior art mud pumps.
Although beneficial results may be obtained through the use of the fluid driven mud pump, as described above, it is desirable to minimize pressure fluctuations. There are a number of reasons for this. Pressure fluctuations tend to cause a pulsing of the drilling fluid which causes the drill bit to "bounce". A bouncing of the drill bit can cause a fracturing of the formation and can cause the drill bit to wander adversely affecting directional control. Pressure is monitored by the drillers to ascertain what is occurring downhole. As pressure changes the drillers must react to anticipate problems. For example, the drillers might respond to a minor change in pressure by altering the viscosity of the i drilling fluid. The drillers might respond to a major decrease in pressure by putting additives in the drilling fluid to seal the formation on the assumption that drilling fluid is being lost to the formation. The drillers might interpret a major increase in pressure as an indication that there has been a loss of circulation of cuttings and take measures to prevent the drill bit from becoming stuck in the hole. The prior art fluid driven mud pumps used two hydraulic cylinders so that one was always discharging while the other was one the backstroke.
The fluid driven mud pump, as described above, provides equivalent output to the two hydraulic cylinders of the prior art. However, even more beneficial results may be obtained when two or more pump bodies form one pumping unit, with the positioning of the piston of the fluid drive cylinder of each pump body being out of phase to provide a constant sequential discharge. This enables, two, three, four or more pump bodies to pump as a unit. The configuration which will hereinafter be further described uses three pump bodies. In doing so, the present invention is able to maintain a much more constant pressure than was possible with prior art fluid driven mud pumps.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of a first embodiment of fluid driven mud pump constructed in accordance with the teachings of the present invention, using a single pump body.
FIGURE 2 is a top plan view, in section, of a second embodiment of fluid driven mud pump constructed in accordance with the teachings of the present invention, using three pump bodies at the initiation of a pumping cycle.
FIGURE 3 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a first of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 4 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a second of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 5 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a third of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 6 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a fourth of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 7 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a fifth of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 8 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a sixth of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 9 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a commencement of a second pumping cycle with the three pump bodies operating 1/3 out of phase.
FIGURE 10 is a side elevation view, in section, of the second embodiment of fluid driven mud pump illustrated in FIGURE 2.
FIGURE 11 is a block diagram of the position sensors, computer and logic controller for the second embodiment of fluid driven mud pump illustrated in FIGURE 2.
FIGURE 12 is a detailed side elevation view, in section, of the valving for the second embodiment of fluid driven mud i pump illustrated in FIGURE 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a fluid driven mud pump 5 generally identified by reference numeral 10, will now be described with reference to FIGURE 1. A second embodiment of fluid driven mud pump generally identified by reference numeral 100 will be described with reference to FIGURES 2 through 12.
Structure and Relationship of Parts for Fluid Driven Mud Pump 10:
Referring to FIGURE 1, there is provided a first embodiment of a fluid driven mud pump 10, which includes a pump body 12 with a fluid drive cylinder 14 that is axially aligned with a first mud cylinder 16 and a second mud cylinder 18. Support legs 20 are provided on pump body 12 for supporting mud driven pump 10.
First mud cylinder 16 has a first end 22, a second end 24, a first inlet 26 and a first outlet 28. First inlet 26 and first outlet 28 are both positioned toward first end 22 of first mud cylinder 16. A one way valve 30 and a one way valve 31 are provided in first inlet 26 and first outlet 28, respectively. One way valve 30 allows fluids to enter first mud cylinder 16 through first inlet 26, but does not permit fluids to exit first mud cylinder 16 via first inlet 26.
Conversely, one way valve 31 allows fluids to exit first mud cylinder 16 through first outlet 28, but does not permit fluids to enter first mud cylinder 16 via first outlet 28. A first piston 32 is positioned in first mud cylinder 16.
Second mud cylinder 18 has a first end 34, a second end 36, a second inlet 38 and a second outlet 40. Second inlet 38 and second outlet 40 are both positioned toward second end 36 of second mud cylinder 18. A one way valve 42 and a one way valve 43 are provided in a second inlet 38 and a second outlet 40, respectively. One way valve 42 allows fluids to enter second mud cylinder 18 through second inlet 38, but does not permit fluids to exit second mud cylinder 18 via second inlet 38. Conversely, one way valve 43 allows fluids to exit second mud cylinder 18 through second outlet 40, but does not permit fluids to enter second mud cylinder 18 via second outlet 40.
One way valves 30, 31, 42 and 43 are the same in structure and operation as one way valves which will hereinafter be described in greater detail with reference to the second embodiment 100.
A second piston 44 is positioned in second mud cylinder 18.
Fluid drive cylinder 14 has a first end 46, a second end 48, and a double acting reciprocating piston 50. Fluid drive cylinder 14 is coupled with second end 24 of first mud cylinder 16 and first end 34 of second mud cylinder 18. A first end 52 of reciprocating piston 50 is positioned in first mud cylinder 16 and secured by a rod clamp 54 to first piston 32. A second end 56 of reciprocating piston 50 is positioned in second mud cylinder 18 and secured by rod clamp 54 to second piston 44 such that as first end 52 of reciprocating piston 50 forces liquid from first outlet 28 of first mud cylinder 16, liquid is concurrently being drawn through second inlet 38 into second mud cylinder 18, and as second end 56 of reciprocating piston 50 forces liquid from second outlet 40 of second mud cylinder 18, liquid is concurrently being drawn through first inlet 26 into first mud cylinder 16.
A sensor 58 is provided on reciprocating piston 50 to sense the position of reciprocating piston 50 during a compression stroke.
Operation of Fluid Driven Mud Pump 10:
The use and operation of fluid driven mud pump 10 will now be described with reference to FIGVRE 1. The unique aspect of fluid driven mud pump 10 is the action of reciprocating piston 50. Referring to FIGURE 1, when fluid driven mud pump 10 is activated, first end 52 of reciprocating piston 50 forces liquid from first outlet 28 of first mud cylinder 16 while liquid is concurrently being drawn through second inlet 38 into ii second mud cylinder 18. As second end 56 of reciprocating piston 50 forces liquid from second outlet 40 of second mud cylinder 18, liquid is concurrently being drawn through first inlet 26 into first mud cylinder 16.
Although beneficial results can be obtained through the use of fluid driven mud pump 10, even greater benefits are obtained when two or more fluid driven mud pumps 10 are combined to form a pumping unit as will hereinafter be further described in relation to fluid driven mud pump 100.
Structure and Relationship of Parts for Fluid Driven Mud Pump 100:
Fluid driven mud pump 10 will now be described with reference to FIGURES 2 through 12. Referring to FIGURE 2, there is provided a second embodiment of a fluid driven mud pump, which is generally referenced by numeral 100. Second embodiment of fluid driven mud pump 100 differs from first embodiment 10, in that first embodiment 10 has only one pump body, whereas second embodiment 100 includes a group of three identical pump bodies, similar to fluid driven mud pump 10, which form one pumping unit. For the purpose of identification these pump bodies will hereinafter be identified as 112a, 112b, and 112c. Each of pump bodies 112a, 112b, and 112c include fluid drive cylinder 114 that is axially aligned with a first mud cylinder 116 and a second mud cylinder 118.
Referring to FIGURE 10, pump bodies 112a, 112b, and 112c are supported by legs 120. First mud cylinder 116 has a first end 122, a second end 124, a first inlet 126 and a first outlet 128. First inlet 126 and first outlet 128 are both positioned toward first end 122. A first piston 132 is positioned in first mud cylinder 116. Second mud cylinder 118 has a first end 134, a second end 136, a second inlet 138 and a second outlet 140. Second inlet 138 and second outlet 140 are both positioned toward second end 136.
Referring to FIGURE 12, a one way valve 130 and a one way valve 131 are provided in first inlet 126 and first outlet 128, respectively. One way valve 130 allows fluids to enter first mud cylinder 116 through first inlet 126, but does not permit fluids to exit first mud cylinder 116 via first inlet 126.
Conversely, one way valve 131 allows fluids to exit first mud cylinder 116 through first outlet 128, but does not permit fluids to enter first mud cylinder 116 via first outlet 128.
Referring to FIGURE 12, one way valve 142 and one way valve 143 are provided in a second inlet 138 and a second outlet 140, respectively. One way valve 142 allows fluids to enter second mud cylinder 118 through second inlet 138, but does not permit fluids to exit second mud cylinder 118 via second inlet 138. Conversely, one way valve 143 allows fluids to exit second mud cylinder 118 through second outlet 140, but does not permit fluids to enter second mud cylinder 118 via second outlet 140.
Referring to FIGURE 12, each of valves 130, 131, 142 and 143 consists of a plug-like tapered valve member 145 which is received in a circular tapered valve seat 147. Each valve member 145 is biased by a spring 149 into engagement with valve seat 147. Fluid pressure coming in the direction of arrow 151 overcomes the biasing force of spring 149 and moves valve member 145 off valve seat 147 to allow fluid to pass. Fluid pressure coming in the opposite direction presses valve member 145 into engagement with valve seat 147.
Referring to FIGURE 2, fluid drive cylinder 114 has a first end 146, a second end 148, and a double acting reciprocating piston 150. Fluid drive cylinder 114 is coupled with second end 124 of first mud cylinder 116 and first end 134 of second mud cylinder 118. Referring to FIGURE 10, a first end 152 of piston 150 is positioned in first mud cylinder 116 and connected by a rod clamp 154 to first piston 132. A second end 156 of piston 150 is positioned in second mud cylinder 118 and connect by rod clamp 154 to second piston 144. As first end 146 of reciprocating piston 150 forces liquid from first outlet 128 of first mud cylinder 116, liquid is concurrently being drawn through second inlet 138 into second mud cylinder 118, and as second end 156 of reciprocating piston 150 forces liquid from second outlet 140 of second mud cylinder 118, liquid is concurrently being drawn through first inlet 126 into first mud cylinder 116.
Referring to FIGURE 11, sensors 158 are provided on reciprocating pistons 150 for sensing the linear position of reciprocating piston 150 during a compression stroke. In the illustrated embodiment sensors 158 are sonic, however other types of sensors such as laser or radio sensors could also be used. A computer 160 with programmable logic controller 162 is provided for controlling the linear positioning of reciprocating piston 150 during a compression stroke.
The positioning of reciprocating piston 150 of fluid drive cylinder 114 of each of three pump bodies 112 is out of phase by approximately 1/3 during the course of operation, as will hereafter be further described with reference to FIGURES 2 through 9.
Operation of Fluid Driven Mud Pump 100:
The use and operation of fluid driven mud pump 100 will now be described with reference to FIGURES 2 through 12.
The key aspect of fluid driven mud pump 100 is its ability to maintain a constant pressure. An operational cycle of fluid driven mud pump 100 will be followed with reference to FIGURES
2 through 9, to demonstrate how this is accomplished.
Referring to FIGURE 2, upon start up of fluid driven mud pump 100 reciprocating piston 150 of each of pump bodies 112a, 112b, and 112c is in the same position. Reciprocating piston 150 of i pump body 112a is set in motion while reciprocating pistons 150 of pump bodies 112b and 112c remain stationary. The direction of motion is indicated by arrow 202. Referring to FIGURE 3, when reciprocating piston 150 of pump body 112a reaches 1/3 of 5 its stroke, reciprocating piston 150 of pump body 112b is set in motion to follow reciprocating piston 150 of pump body 112a.
The direction of motion is indicated by arrow 204.
Reciprocating piston 150 of pump body 112c remains stationary.
Referring to FIGURE 4, when reciprocating piston 150 of pump 10 body 112a reaches 2/3 of its stroke, and reciprocating piston 150 of pump body 112b reaches 1/3 of its stroke, reciprocating piston of pump body 112c is set in motion to follow the reciprocating pistons of pump bodies 112a and 112b. The direction of motion is indicated by arrow 206. Referring to FIGURE 5, as reciprocating piston 150 of pump body 112a completes its stroke, reciprocating piston 150 of pump body 112b is reaching 2/3 of its stroke, and reciprocating piston of pump body 112c is reaching 1/3 of its stroke. Referring to FIGURE 6, reciprocating piston 150 of pump body 112a then changes direction, the change of direction being indicated by arrow 208. As reciprocating piston 150 of pump body 112a reaches 1/3 of its return stroke, reciprocating piston 150 of pump body 112b is completing its initial stroke, and reciprocating piston of pump body 112c is reaching 2/3 of its initial stroke. Referring to FIGURE 7, reciprocating piston 150 of pump body 112b then changes direction, the change of direction being indicated by arrow 210. As reciprocating piston 150 of pump body 112a reaches 2/3 of its return stroke, reciprocating piston 150 of pump body 112b is reaching 1/3 its return stroke, and reciprocating piston of pump body 112c is completing its initial stroke. Referring to FIGURE 8, reciprocating piston 150 of pump body 112c then changes direction, the change of direction being indicated by arrow 212. As reciprocating piston 150 of pump body 112a completes its return stroke, reciprocating piston 150 of pump body 112b is reaching 2/3 its return stroke, and reciprocating piston 150 of pump body 112c is reaching 1/3 its return stroke. Referring to FIGURE 9, reciprocating piston 150 of pump body 112a then changes direction again to repeat the cycle, the change of direction being indicated by arrow 214. As reciprocating piston 150 of pump body 112a reaches 1/3 of a new strokes cycle, reciprocating piston 150 of pump body 112b is completing its return stroke, and reciprocating piston 150 of pump body 112c is reaching 2/3 its return stroke. It can be, therefore, be seen how the discharge phase of each of pump bodies 112a, 112b and 112c is 1/3 out of phase, thereby maintaining a relatively constant pressure. Referring to FIGURE 11, computer 160 with programmable logic controller 162 receives data from sensors 158 to control and maintain the relating positioning of reciprocating pistons 150.
The preferred version of fluid driven mud pump with two or more pump bodies formed as a pumping unit, as described above, provides a number of advantages. It maintains a constant sequential discharge pressure that has fewer pulsations than was possible with prior art mud pumps. It has less weight and puts out a higher volume over a broader range of pressure than mechanical systems that operate off a crankshaft. It is capable of working up to an maintaining a desired pressure when coupled with feedback sensors and computer controls. The pumping unit uses a slower stroke rate to acconplish desired pressure levels. The slower stroke rate extends the life of parts which are prone to wear, such as seals. If greater pump capacity is required, more pumping modules can be added to the described configuration of 3 to from a configuration with greater capacity having 4, 5, 6, 7, or more pumping modules.
The embodiments described above may be used in combination with a drilling rig to supply drilling fluid.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Fluid Driven Mud Pump FIELD OF THE INVENTION
The present invention relates to a fluid driven mud pump used to pump drilling fluids when earth drilling BACKGROUND OF THE INVENTION
Fluid driven mud pumps presently in use in the oil and gas drilling industry consist crankshaft driven pistons which reciprocate in cylinders. The mud pumps come in duplex and triplex versions.
Triplex mud pumps have three cylinders which alternatively discharge drilling fluids into a flow line. Each cylinder discharges on the forward stroke, and does not create fluid movement on the backward stroke.
Duplex mud pumps have two cylinders which alternatively discharge drilling fluids into a flow line. Each cylinder discharges on both the forward stroke and on the backward stroke. A greater quantity of fluid is pumped on the forward stroke as compared to the back stroke. On the forward stroke the full face of the piston acts against fluid within the cylinder, whereas on the backward stroke the face area of the piston acting upon the fluid within the cylinder is reduced by the diameter of the piston rod. This creates a pressure pulse as the piston shifts between the forward stroke and the backward stroke.
SiTHIIKARY OF THE INVENTION
The present invention is an alternative configuration of fluid driven mud pumps.
According to the present invention there is provided a fluid driven mud pump; the pump body including a fluid drive cylinder axially aligned with a first mud cylinder and a second mud cylinder. The first mud cylinder has a first end, a second end, a first inlet and a first outlet. The first inlet and the first outlet are both positioned toward the first end. The second mud cylinder has a first end, a second end, a second inlet and a second outlet. The second inlet and the second outlet are both positioned toward the second end. The fluid drive cylinder has a first end, a second end, and a double acting reciprocating piston. The fluid drive cylinder is coupled with the second end of the first mud cylinder and the first end of the second mud cylinder. The first end of the piston is positioned in the first mud cylinder. The second end of the piston is positioned in the second mud cylinder. As the first end of the piston forces liquid from the first outlet of the first mud cylinder, liquid is concurrently being drawn through the second inlet into the second mud cylinder. As the second end of the piston forces liquid from the second outlet of the second mud cylinder, liquid is concurrently being drawn through the first inlet into the first mud cylinder.
With the fluid driven mud pump, as described above, the fluid discharged by the forward stroke is substantially the same as the fluid discharged by the backward stroke. There is not a cessation of pumping nor a reduction in output on the backstroke, as with the prior art mud pumps.
Although beneficial results may be obtained through the use of the fluid driven mud pump, as described above, it is desirable to minimize pressure fluctuations. There are a number of reasons for this. Pressure fluctuations tend to cause a pulsing of the drilling fluid which causes the drill bit to "bounce". A bouncing of the drill bit can cause a fracturing of the formation and can cause the drill bit to wander adversely affecting directional control. Pressure is monitored by the drillers to ascertain what is occurring downhole. As pressure changes the drillers must react to anticipate problems. For example, the drillers might respond to a minor change in pressure by altering the viscosity of the i drilling fluid. The drillers might respond to a major decrease in pressure by putting additives in the drilling fluid to seal the formation on the assumption that drilling fluid is being lost to the formation. The drillers might interpret a major increase in pressure as an indication that there has been a loss of circulation of cuttings and take measures to prevent the drill bit from becoming stuck in the hole. The prior art fluid driven mud pumps used two hydraulic cylinders so that one was always discharging while the other was one the backstroke.
The fluid driven mud pump, as described above, provides equivalent output to the two hydraulic cylinders of the prior art. However, even more beneficial results may be obtained when two or more pump bodies form one pumping unit, with the positioning of the piston of the fluid drive cylinder of each pump body being out of phase to provide a constant sequential discharge. This enables, two, three, four or more pump bodies to pump as a unit. The configuration which will hereinafter be further described uses three pump bodies. In doing so, the present invention is able to maintain a much more constant pressure than was possible with prior art fluid driven mud pumps.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a side elevation view, in section, of a first embodiment of fluid driven mud pump constructed in accordance with the teachings of the present invention, using a single pump body.
FIGURE 2 is a top plan view, in section, of a second embodiment of fluid driven mud pump constructed in accordance with the teachings of the present invention, using three pump bodies at the initiation of a pumping cycle.
FIGURE 3 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a first of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 4 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a second of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 5 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a third of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 6 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a fourth of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 7 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a fifth of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 8 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a sixth of six piston positions with the three pump bodies operating 1/3 out of phase.
FIGURE 9 is simplified top plan view of the fluid driven mud pump illustrated in FIGURE 2, showing a commencement of a second pumping cycle with the three pump bodies operating 1/3 out of phase.
FIGURE 10 is a side elevation view, in section, of the second embodiment of fluid driven mud pump illustrated in FIGURE 2.
FIGURE 11 is a block diagram of the position sensors, computer and logic controller for the second embodiment of fluid driven mud pump illustrated in FIGURE 2.
FIGURE 12 is a detailed side elevation view, in section, of the valving for the second embodiment of fluid driven mud i pump illustrated in FIGURE 2.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a fluid driven mud pump 5 generally identified by reference numeral 10, will now be described with reference to FIGURE 1. A second embodiment of fluid driven mud pump generally identified by reference numeral 100 will be described with reference to FIGURES 2 through 12.
Structure and Relationship of Parts for Fluid Driven Mud Pump 10:
Referring to FIGURE 1, there is provided a first embodiment of a fluid driven mud pump 10, which includes a pump body 12 with a fluid drive cylinder 14 that is axially aligned with a first mud cylinder 16 and a second mud cylinder 18. Support legs 20 are provided on pump body 12 for supporting mud driven pump 10.
First mud cylinder 16 has a first end 22, a second end 24, a first inlet 26 and a first outlet 28. First inlet 26 and first outlet 28 are both positioned toward first end 22 of first mud cylinder 16. A one way valve 30 and a one way valve 31 are provided in first inlet 26 and first outlet 28, respectively. One way valve 30 allows fluids to enter first mud cylinder 16 through first inlet 26, but does not permit fluids to exit first mud cylinder 16 via first inlet 26.
Conversely, one way valve 31 allows fluids to exit first mud cylinder 16 through first outlet 28, but does not permit fluids to enter first mud cylinder 16 via first outlet 28. A first piston 32 is positioned in first mud cylinder 16.
Second mud cylinder 18 has a first end 34, a second end 36, a second inlet 38 and a second outlet 40. Second inlet 38 and second outlet 40 are both positioned toward second end 36 of second mud cylinder 18. A one way valve 42 and a one way valve 43 are provided in a second inlet 38 and a second outlet 40, respectively. One way valve 42 allows fluids to enter second mud cylinder 18 through second inlet 38, but does not permit fluids to exit second mud cylinder 18 via second inlet 38. Conversely, one way valve 43 allows fluids to exit second mud cylinder 18 through second outlet 40, but does not permit fluids to enter second mud cylinder 18 via second outlet 40.
One way valves 30, 31, 42 and 43 are the same in structure and operation as one way valves which will hereinafter be described in greater detail with reference to the second embodiment 100.
A second piston 44 is positioned in second mud cylinder 18.
Fluid drive cylinder 14 has a first end 46, a second end 48, and a double acting reciprocating piston 50. Fluid drive cylinder 14 is coupled with second end 24 of first mud cylinder 16 and first end 34 of second mud cylinder 18. A first end 52 of reciprocating piston 50 is positioned in first mud cylinder 16 and secured by a rod clamp 54 to first piston 32. A second end 56 of reciprocating piston 50 is positioned in second mud cylinder 18 and secured by rod clamp 54 to second piston 44 such that as first end 52 of reciprocating piston 50 forces liquid from first outlet 28 of first mud cylinder 16, liquid is concurrently being drawn through second inlet 38 into second mud cylinder 18, and as second end 56 of reciprocating piston 50 forces liquid from second outlet 40 of second mud cylinder 18, liquid is concurrently being drawn through first inlet 26 into first mud cylinder 16.
A sensor 58 is provided on reciprocating piston 50 to sense the position of reciprocating piston 50 during a compression stroke.
Operation of Fluid Driven Mud Pump 10:
The use and operation of fluid driven mud pump 10 will now be described with reference to FIGVRE 1. The unique aspect of fluid driven mud pump 10 is the action of reciprocating piston 50. Referring to FIGURE 1, when fluid driven mud pump 10 is activated, first end 52 of reciprocating piston 50 forces liquid from first outlet 28 of first mud cylinder 16 while liquid is concurrently being drawn through second inlet 38 into ii second mud cylinder 18. As second end 56 of reciprocating piston 50 forces liquid from second outlet 40 of second mud cylinder 18, liquid is concurrently being drawn through first inlet 26 into first mud cylinder 16.
Although beneficial results can be obtained through the use of fluid driven mud pump 10, even greater benefits are obtained when two or more fluid driven mud pumps 10 are combined to form a pumping unit as will hereinafter be further described in relation to fluid driven mud pump 100.
Structure and Relationship of Parts for Fluid Driven Mud Pump 100:
Fluid driven mud pump 10 will now be described with reference to FIGURES 2 through 12. Referring to FIGURE 2, there is provided a second embodiment of a fluid driven mud pump, which is generally referenced by numeral 100. Second embodiment of fluid driven mud pump 100 differs from first embodiment 10, in that first embodiment 10 has only one pump body, whereas second embodiment 100 includes a group of three identical pump bodies, similar to fluid driven mud pump 10, which form one pumping unit. For the purpose of identification these pump bodies will hereinafter be identified as 112a, 112b, and 112c. Each of pump bodies 112a, 112b, and 112c include fluid drive cylinder 114 that is axially aligned with a first mud cylinder 116 and a second mud cylinder 118.
Referring to FIGURE 10, pump bodies 112a, 112b, and 112c are supported by legs 120. First mud cylinder 116 has a first end 122, a second end 124, a first inlet 126 and a first outlet 128. First inlet 126 and first outlet 128 are both positioned toward first end 122. A first piston 132 is positioned in first mud cylinder 116. Second mud cylinder 118 has a first end 134, a second end 136, a second inlet 138 and a second outlet 140. Second inlet 138 and second outlet 140 are both positioned toward second end 136.
Referring to FIGURE 12, a one way valve 130 and a one way valve 131 are provided in first inlet 126 and first outlet 128, respectively. One way valve 130 allows fluids to enter first mud cylinder 116 through first inlet 126, but does not permit fluids to exit first mud cylinder 116 via first inlet 126.
Conversely, one way valve 131 allows fluids to exit first mud cylinder 116 through first outlet 128, but does not permit fluids to enter first mud cylinder 116 via first outlet 128.
Referring to FIGURE 12, one way valve 142 and one way valve 143 are provided in a second inlet 138 and a second outlet 140, respectively. One way valve 142 allows fluids to enter second mud cylinder 118 through second inlet 138, but does not permit fluids to exit second mud cylinder 118 via second inlet 138. Conversely, one way valve 143 allows fluids to exit second mud cylinder 118 through second outlet 140, but does not permit fluids to enter second mud cylinder 118 via second outlet 140.
Referring to FIGURE 12, each of valves 130, 131, 142 and 143 consists of a plug-like tapered valve member 145 which is received in a circular tapered valve seat 147. Each valve member 145 is biased by a spring 149 into engagement with valve seat 147. Fluid pressure coming in the direction of arrow 151 overcomes the biasing force of spring 149 and moves valve member 145 off valve seat 147 to allow fluid to pass. Fluid pressure coming in the opposite direction presses valve member 145 into engagement with valve seat 147.
Referring to FIGURE 2, fluid drive cylinder 114 has a first end 146, a second end 148, and a double acting reciprocating piston 150. Fluid drive cylinder 114 is coupled with second end 124 of first mud cylinder 116 and first end 134 of second mud cylinder 118. Referring to FIGURE 10, a first end 152 of piston 150 is positioned in first mud cylinder 116 and connected by a rod clamp 154 to first piston 132. A second end 156 of piston 150 is positioned in second mud cylinder 118 and connect by rod clamp 154 to second piston 144. As first end 146 of reciprocating piston 150 forces liquid from first outlet 128 of first mud cylinder 116, liquid is concurrently being drawn through second inlet 138 into second mud cylinder 118, and as second end 156 of reciprocating piston 150 forces liquid from second outlet 140 of second mud cylinder 118, liquid is concurrently being drawn through first inlet 126 into first mud cylinder 116.
Referring to FIGURE 11, sensors 158 are provided on reciprocating pistons 150 for sensing the linear position of reciprocating piston 150 during a compression stroke. In the illustrated embodiment sensors 158 are sonic, however other types of sensors such as laser or radio sensors could also be used. A computer 160 with programmable logic controller 162 is provided for controlling the linear positioning of reciprocating piston 150 during a compression stroke.
The positioning of reciprocating piston 150 of fluid drive cylinder 114 of each of three pump bodies 112 is out of phase by approximately 1/3 during the course of operation, as will hereafter be further described with reference to FIGURES 2 through 9.
Operation of Fluid Driven Mud Pump 100:
The use and operation of fluid driven mud pump 100 will now be described with reference to FIGURES 2 through 12.
The key aspect of fluid driven mud pump 100 is its ability to maintain a constant pressure. An operational cycle of fluid driven mud pump 100 will be followed with reference to FIGURES
2 through 9, to demonstrate how this is accomplished.
Referring to FIGURE 2, upon start up of fluid driven mud pump 100 reciprocating piston 150 of each of pump bodies 112a, 112b, and 112c is in the same position. Reciprocating piston 150 of i pump body 112a is set in motion while reciprocating pistons 150 of pump bodies 112b and 112c remain stationary. The direction of motion is indicated by arrow 202. Referring to FIGURE 3, when reciprocating piston 150 of pump body 112a reaches 1/3 of 5 its stroke, reciprocating piston 150 of pump body 112b is set in motion to follow reciprocating piston 150 of pump body 112a.
The direction of motion is indicated by arrow 204.
Reciprocating piston 150 of pump body 112c remains stationary.
Referring to FIGURE 4, when reciprocating piston 150 of pump 10 body 112a reaches 2/3 of its stroke, and reciprocating piston 150 of pump body 112b reaches 1/3 of its stroke, reciprocating piston of pump body 112c is set in motion to follow the reciprocating pistons of pump bodies 112a and 112b. The direction of motion is indicated by arrow 206. Referring to FIGURE 5, as reciprocating piston 150 of pump body 112a completes its stroke, reciprocating piston 150 of pump body 112b is reaching 2/3 of its stroke, and reciprocating piston of pump body 112c is reaching 1/3 of its stroke. Referring to FIGURE 6, reciprocating piston 150 of pump body 112a then changes direction, the change of direction being indicated by arrow 208. As reciprocating piston 150 of pump body 112a reaches 1/3 of its return stroke, reciprocating piston 150 of pump body 112b is completing its initial stroke, and reciprocating piston of pump body 112c is reaching 2/3 of its initial stroke. Referring to FIGURE 7, reciprocating piston 150 of pump body 112b then changes direction, the change of direction being indicated by arrow 210. As reciprocating piston 150 of pump body 112a reaches 2/3 of its return stroke, reciprocating piston 150 of pump body 112b is reaching 1/3 its return stroke, and reciprocating piston of pump body 112c is completing its initial stroke. Referring to FIGURE 8, reciprocating piston 150 of pump body 112c then changes direction, the change of direction being indicated by arrow 212. As reciprocating piston 150 of pump body 112a completes its return stroke, reciprocating piston 150 of pump body 112b is reaching 2/3 its return stroke, and reciprocating piston 150 of pump body 112c is reaching 1/3 its return stroke. Referring to FIGURE 9, reciprocating piston 150 of pump body 112a then changes direction again to repeat the cycle, the change of direction being indicated by arrow 214. As reciprocating piston 150 of pump body 112a reaches 1/3 of a new strokes cycle, reciprocating piston 150 of pump body 112b is completing its return stroke, and reciprocating piston 150 of pump body 112c is reaching 2/3 its return stroke. It can be, therefore, be seen how the discharge phase of each of pump bodies 112a, 112b and 112c is 1/3 out of phase, thereby maintaining a relatively constant pressure. Referring to FIGURE 11, computer 160 with programmable logic controller 162 receives data from sensors 158 to control and maintain the relating positioning of reciprocating pistons 150.
The preferred version of fluid driven mud pump with two or more pump bodies formed as a pumping unit, as described above, provides a number of advantages. It maintains a constant sequential discharge pressure that has fewer pulsations than was possible with prior art mud pumps. It has less weight and puts out a higher volume over a broader range of pressure than mechanical systems that operate off a crankshaft. It is capable of working up to an maintaining a desired pressure when coupled with feedback sensors and computer controls. The pumping unit uses a slower stroke rate to acconplish desired pressure levels. The slower stroke rate extends the life of parts which are prone to wear, such as seals. If greater pump capacity is required, more pumping modules can be added to the described configuration of 3 to from a configuration with greater capacity having 4, 5, 6, 7, or more pumping modules.
The embodiments described above may be used in combination with a drilling rig to supply drilling fluid.
In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are not excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (2)
1. A fluid driven mud pump, comprising:
a group of three pump bodies forming one pumping unit, each of the pump bodies including a fluid drive cylinder axially aligned with a first mud cylinder and a second mud cylinder;
the first mud cylinder having a first end, a second end, a first inlet and a first outlet, the first inlet and the first outlet both being positioned toward the first end;
the second mud cylinder having a first end, a second end, a second inlet and a second outlet, the second inlet and the second outlet both being positioned toward the second end;
the fluid drive cylinder having a first end, a second end, and a double acting reciprocating piston, the fluid drive cylinder being coupled with the second end of the first mud cylinder and the first end of the second mud cylinder, the first end of the piston being positioned in the first mud cylinder, the second end of the piston being positioned in the second mud cylinder, such that as the first end of the piston forces liquid from the first outlet of the first mud cylinder, liquid is concurrently being drawn through the second inlet into the second mud cylinder, and as the second end of the piston forces liquid from the second outlet of the second mud cylinder, liquid is concurrently being drawn through the first inlet into the first mud cylinder;
the positioning of the piston of the fluid drive cylinder of each of the three pump bodies being out of phase by approximately 1/3, such that a third of the fluid drive cylinders commences a compression stroke, a second of the fluid drive cylinders is already advanced by 1/3 and a first of the fluid drive cylinders is already advanced by 2/3;
a position sensor associated with the piston of each pump body for sensing the linear position of each pump body; and a controller for controlling the relative phase of the pump bodies based on input from the position sensors, the controller independently controlling each pump body.
a group of three pump bodies forming one pumping unit, each of the pump bodies including a fluid drive cylinder axially aligned with a first mud cylinder and a second mud cylinder;
the first mud cylinder having a first end, a second end, a first inlet and a first outlet, the first inlet and the first outlet both being positioned toward the first end;
the second mud cylinder having a first end, a second end, a second inlet and a second outlet, the second inlet and the second outlet both being positioned toward the second end;
the fluid drive cylinder having a first end, a second end, and a double acting reciprocating piston, the fluid drive cylinder being coupled with the second end of the first mud cylinder and the first end of the second mud cylinder, the first end of the piston being positioned in the first mud cylinder, the second end of the piston being positioned in the second mud cylinder, such that as the first end of the piston forces liquid from the first outlet of the first mud cylinder, liquid is concurrently being drawn through the second inlet into the second mud cylinder, and as the second end of the piston forces liquid from the second outlet of the second mud cylinder, liquid is concurrently being drawn through the first inlet into the first mud cylinder;
the positioning of the piston of the fluid drive cylinder of each of the three pump bodies being out of phase by approximately 1/3, such that a third of the fluid drive cylinders commences a compression stroke, a second of the fluid drive cylinders is already advanced by 1/3 and a first of the fluid drive cylinders is already advanced by 2/3;
a position sensor associated with the piston of each pump body for sensing the linear position of each pump body; and a controller for controlling the relative phase of the pump bodies based on input from the position sensors, the controller independently controlling each pump body.
2. In combination:
a drilling rig;
a fluid driven mud pump supplying drilling fluid to the drilling rig, the fluid driven mud pump including a group of pump bodies forming one pumping unit, each of the pump bodies including a fluid drive cylinder axially aligned with a first mud cylinder and a second mud cylinder;
the first mud cylinder having a first end, a second end, a first inlet and a first outlet, the first inlet and the first outlet both being positioned toward the first end;
the second mud cylinder having a first end, a second end, a second inlet and a second outlet, the second inlet and the second outlet both being positioned toward the second end;
the fluid drive cylinder having a first end, a second end, and a double acting reciprocating piston, the fluid drive cylinder being coupled with the second end of the first mud cylinder and the first end of the second mud cylinder, the first end of the piston being positioned in the first mud cylinder, the second end of the piston being positioned in the second mud cylinder, such that as the first end of the piston forces liquid from the first outlet of the first mud cylinder, liquid is concurrently being drawn through the second inlet into the second mud cylinder, and as the second end of the piston forces liquid from the second outlet of the second mud cylinder, liquid is concurrently being drawn through the first inlet into the first mud cylinder;
the positioning of the piston of the fluid drive cylinder of each of the pump bodies being out of phase, thereby providing a constant sequential discharge;
a position sensor associated with the piston of each pump body for sensing the linear position of each pump body; and a controller for controlling the relative phase of the pump bodies based on input from the position sensors, the controller independently controlling each pump body.
a drilling rig;
a fluid driven mud pump supplying drilling fluid to the drilling rig, the fluid driven mud pump including a group of pump bodies forming one pumping unit, each of the pump bodies including a fluid drive cylinder axially aligned with a first mud cylinder and a second mud cylinder;
the first mud cylinder having a first end, a second end, a first inlet and a first outlet, the first inlet and the first outlet both being positioned toward the first end;
the second mud cylinder having a first end, a second end, a second inlet and a second outlet, the second inlet and the second outlet both being positioned toward the second end;
the fluid drive cylinder having a first end, a second end, and a double acting reciprocating piston, the fluid drive cylinder being coupled with the second end of the first mud cylinder and the first end of the second mud cylinder, the first end of the piston being positioned in the first mud cylinder, the second end of the piston being positioned in the second mud cylinder, such that as the first end of the piston forces liquid from the first outlet of the first mud cylinder, liquid is concurrently being drawn through the second inlet into the second mud cylinder, and as the second end of the piston forces liquid from the second outlet of the second mud cylinder, liquid is concurrently being drawn through the first inlet into the first mud cylinder;
the positioning of the piston of the fluid drive cylinder of each of the pump bodies being out of phase, thereby providing a constant sequential discharge;
a position sensor associated with the piston of each pump body for sensing the linear position of each pump body; and a controller for controlling the relative phase of the pump bodies based on input from the position sensors, the controller independently controlling each pump body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2382668A CA2382668C (en) | 2002-04-19 | 2002-04-19 | Fluid driven mud pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2382668A CA2382668C (en) | 2002-04-19 | 2002-04-19 | Fluid driven mud pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2382668A1 CA2382668A1 (en) | 2003-10-19 |
| CA2382668C true CA2382668C (en) | 2010-05-11 |
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ID=29256185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2382668A Expired - Lifetime CA2382668C (en) | 2002-04-19 | 2002-04-19 | Fluid driven mud pump |
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| Country | Link |
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| CA (1) | CA2382668C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2663348C (en) | 2009-04-15 | 2015-09-29 | Shawn J. Nielsen | Method of protecting a top drive drilling assembly and a top drive drilling assembly modified in accordance with this method |
| ITTO20100273A1 (en) * | 2010-04-09 | 2011-10-10 | Drillmec Spa | DEVICE AND METHOD OF CONTROL FOR CEMENT PISTON PUMPS. |
| CN106050895B (en) * | 2016-08-04 | 2019-01-18 | 兰州兰石集团有限公司 | Six cylinder slush pump of Double gear-ring |
-
2002
- 2002-04-19 CA CA2382668A patent/CA2382668C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CA2382668A1 (en) | 2003-10-19 |
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