More specifically, these devices utilize positive displacement technology by trapping a certain volume of air then discharging or forcing it out against the system pressure. Specific gravity specific gravity is used to compare the density of a product to the density of water. In the search for a viable alternative to conventional rotary drilling in which the entire drill string is rotated from surface. The power section of a positive displacement drill motor pdm consists of a steel rotor and a tribe with a molded elastomeric lining stator. These generally produce a continuous, or sometimes a slightly pulsed, water output. Positive displacement motors pdms have three major elements figure 261. The turbodrill, first patented in 1873, provided a means of driving the bit by harnessing the power of the drilling fluid, but the complexity of the tool and the lack of suitable drilling bits prevented it from being. Positive displacement motors equipment and supplies.
A positive displacement pump must not operate against a closed valve on the discharge side of the pump, because it has no shutoff head like centrifugal pumps. A positive displacement downhole mud motor is a downhole tool which is used during field drilling operations to provide rotational power to drill bits and other downhole tools. A positive displacement pump delivers a fixed amount of fluid per revolution. Positive displacement pumps features and a positive displace. Pdf the power section of a positive displacement drill motor pdm consists of a steel rotor and a tribe with a molded elastomeric lining. Thinker, researcher, innovator, thought leader, author, educator, educationist dr. A person without significant exposure to pump selection is often experienced only with centrifugal pump curves. These efficiencies apply for all series 40 motors at maximum displacement. Guide to reading a positive displacement pump curve. Design fabrication and analysis of positive displacement mud motors.
Our aims are to 1 emphasize the basic prin ciple involved in the operation. Positive displacement motor pdm the use of mud motors is greatly dependent on financial ef ficiency. Aerzen manufactures all key components in house, from the assembly through to the control system and, in so doing, the familyrun company places value on quality and. A positive displacement pump operating against closed discharge valves continues to produce flow until the pressure in the discharge. From top to bottom, they are the power section, transmission, and output shaft. Overview of blower technologies and comparison of highspeed. Pumps operate by some mechanism typically reciprocating or rotary, and consume energy to perform mechanical work moving the. The positive displacement motor pdm has been used in directional drilling now for several years and is a key component in bottom hole drilling assemblies. Positive displacement pumps here at pcm, we offer a wide range of positive displacement pumps, designed to meet your needs whatever industry youre working in. Analysis of energy harvesting positive displacement motor. Pdf stator life of a positive displacement downhole. Positive displacement pump pdp is a type of pump in which a moving fluid is captured in a cavity and then discharges that fixed amount of fluid.
The second is to help the user analyze their pumping requirements, make an appropriate pump selection and size the pump, motor and drive for best performance. Positive displacement pump design and calculation tajilapak. Overview of blower technologies and comparison of high. Guide to reading a positive displacement pump curve pumps. Positive displacement pumps are generally used for specialist applications such as for pumping viscous liquids or liquids that contain suspended or fragile solids.
The fpd3000 series positive displacement flowmeters are affordable and accurate. Physics of failure analysis of power section assembly for positive. This pump can provide the mud at varying flow rates and. Todays positive displacement motors are based on the work of rene moineau, a french.
Positive displacement flow meters well suited for viscous fluids which are difficult to meter with a turbine type flow meter. The performance and efficiency of hydraulic pumps and. Reinforced bearing section and shorter bit box to bend. A pump and motor test stand is constructed to measure the ef. Test conditions focused on low displacement and low speed regimes.
Hydraulic pumps and motors are almost exclusively positive displacement devices. A mud motor or drilling motor is a progressive cavity positive displacement pump pcpd placed in the drill string to provide additional power to the bit while drilling. A circulating drilling fluid is pumped through the positive displacement motor, converting the hydraulic power of the fluid into mechanical power to drive the drill bit. What is a positive displacement blower blocker and wallace. An advantage of mud lubricated bearings is that there are no limitations on bit pressure drop compared to a sealed bearing assembly and temperature is not generally an issue. Jan 01, 2015 the positive displacement motors covers the full spectrum of topics in terms of analysis and design of the downhole mud motor that serves the workhorse of the downhole drilling system for several decades. Rotary positive displacement blower series 1746 liplabyrinth air service series 5781 single envelope gastight series 6467 double envelope gastight obsolete 1647 series also included in this manual md pneumatics 4840 west kearney street, p. Positive displacement motor pdm the positive displacement motors pdm of micon downholetools gmbh apply the reverse pumping principle. Drill string rotation can be eliminated by having a motor placed downhole to drive the bit by hydraulic or electrical power. It consist of two archimedes screws that intermesh and are enclosed within the same chamber. Some positive displacement pumps use an expanding cavity on on the suction side and a decreasing cavity on the suction side expands and the liquid flows out of the discharges side. Positive displacement an overview sciencedirect topics.
To make a good choice between these pump types it is important to understand that these two types of pumps behave very differently. Nov 12, 2016 positive displacement pump makes a fluid move by traping a fixed amount and forcing displacing that trapped volume into the discharge pipe. Positive displacement motor an overview sciencedirect. Components of positive displacement motors pdms a positive displacement motor is made up of four basic components. Rforce motors allow intense angle buildup, effective well trajectory control, drill string. Specifying a positive displacement pump without prior training is a difficult task. Selection and integration of positive displacement motors. On a test stand the flow rate is determined for various speeds and total head i. Technical requirements, performance limitations and terminology are presented to assist the person specifying a pd pump.
Design fabrication and analysis of positive displacement. Motor performance as a function of operating speed 5000 0 4000 3000 2000 essur e 0 25 50 75 100 speed % of rated speed psi 345 0 270 210 140 bar 70 80% 85% 88% 89% 8 0. A pump is a device that moves fluids liquids or gases, or sometimes slurries, by mechanical action. A down hole motor used in the oil field to drive the drill bit or other down hole tools during directional drilling or performance drilling applications. Generally, we express density in units of pounds per cubic inch. These rotary lobe machines are typically used for polymer powder or pellet transfer and come in different sizes. Us9206644b2 positive displacement motor pdm rotary. Ideal for many flow measurement applications, including many oil flow applications.
Different types of pumps positive displacement pumps. Also there was some debate originally as to whether or not the positive displacement pump was a constant torque load, on page 19 on the pdf toolbar of the baldor reference the pump is listed as a constant torque load. Understanding a positive displacement pump motor electric. The rotational motion to a drill bit is provided by the drilling fluid which is pumped into the wellbore with the help of a positive displacement motor that. Positive displacement pumps with positive displacement pumps the flow rate q is linear dependent on the pump speed n. The pdm bearing section contains a mudlubricated bearing stack that utilize a stacked ballandrace to handle thrust loads, while carbide radial bearings handle side loads. Series 40 axial piston motors technical information manual. Highspeed permanent magnet motor blower enclosure singlesource responsibility by. Positive displacement flow meter for fuels and oils. Introduction to problem solving positive displacement pumps. What is positive displacement pump definition, types and. Positive displacement pump makes a fluid move by traping a fixed amount and forcing displacing that trapped volume into the discharge pipe.
Positive displacement pump problems 5 overview of pump problems typically found on positive displacement pumps. Positive displacement motors theory and applications robello samuel. Screw pumps are used for high flows at relatively low pressure and are used on board ships. A regenerative loop hydraulic system is used to reduce the power requirements of the test stand. A positive displacement pumps is a constant flow machine a positive displacement pump must never operate against closed valves on the discharge side of the pump it has no shutoff head like centrifugal pumps. Motors transfer fluid power into mechanical power translational or rotary. Positive displacement vs centrifugal pumps guide when to. In general, the downhole positive displacement motor constructed on the moineau principle is composed of four sections. Positivedisplacement pumps frequently are used in hydraulic systems at pressures ranging up to 5000 psi. The pcpd pump uses drilling fluid commonly referred to as drilling mud, or just mud to create eccentric motion in the power section of the motor which is transferred as. Positive displacement motors can also be used for performance drilling, straight hole drilling, coring, underreaming, and milling operations. The performance map provides typical motor overall efficiencies at various operating parameters.
In straight hole drilling, the motor functions as a drilling performance tool to increase the rate of penetration and reduce casing wear by minimizing drillstring rotation. Rvortex is a straighttype motor with a reinforced bearing section for use with rotary steerable systems rss rforce is a new type of motors to be used at maximum drilling parameters in all well types design features. A positivedisplacement downhole mud motor is a downhole tool which is used during field drilling operations to provide rotational power to drill bits and other downhole tools. They also provide a fixed displacement per revolution and, within mechanical limitations, infinite pressure to move fluids.
Pump pump positive displacement pumps positive displacement pumps, which lift a given volume for each cycle of operation, can be divided into two main classes, reciprocating and rotary. The displacement of fluid takes place by some parts like plunger, piston, diaphragm etc. Box 2877 springfield, missouri usa 658012877 tel 417 8658715 800 8256937 fax 417. Positive displacement multistage singlestage centrifugal. Look inside positive displacement motor sigma quadrant. Positive displacement motor an overview sciencedirect topics. A centrifugal pump transfers the kinetic energy of the motor to the liquid by a spinning impeller. There is a reason behind the proverbial reliability of the machines. This book presents functional, operational and technical aspects of positive displacement motor.
One primary feature is the ability to maintain consistent accuracy despite changing viscosity conditions. Positive displacement blowers pd blowers, roots blowers. Positive displacement motors theory and application. In straight vertical holes, the mud motor may be used solely for increased rate of penetration rop, or to minimize erosion and wear on the drill string, since the drill string does not need to be turned as fast. Therefore, it can be frustrating to get the data required from a positive displacement curve. Request pdf physics of failure analysis of power section assembly for positive displacement motor power section assembly is the core part of positive. Unfortunately, hydraulic pumps and motors have many leakage paths from high pressure to low pressure, so a signi. Positive displacement flow meters omega engineering. Aug 18, 2016 a down hole motor used in the oil field to drive the drill bit or other down hole tools during directional drilling or performance drilling applications. Sep 07, 2017 positive displacement pump pdp is a type of pump in which a moving fluid is captured in a cavity and then discharges that fixed amount of fluid. A positive displacement pump operating against a closed discharge valve continues to produce flow and the pressure in the discharge line increases until the line bursts, the pump is. When to use a centrifugal or a positive displacement pump pd pump is not always a clear choice. Pumps can be classified into three major groups according to the method they use to move the fluid.
Positive displacement pd pump technologies vary, as do the curves for these pumps. Pumps are available with a sensitive adjustable relief valve for rapid opening and damped closing and can be fitted with relief valve jacking device for manual by passrecirculation of liquid. The baker hughes navidrill tool is a positive displacement motor pdm used as a downhole drive in deep drilling operations. Stator life of a positive displacement downhole drilling motor. Definitions and terms density density is the mass of a substance per unit volume. Positive displacement pumps features and a positive. A principal advantage of hydraulic power is the high power density power per unit weight that can be achieved. The positive displacement motor pdm has been used in directional drilling now for several years and is a key component in bottom hole. A positive displacement motor is made up of four basic components. Atmospheric pressure, centrifugal force, positive displacement and movement of columns of fluid caused by differences in specific gravity. Ideal for many flow measurement applications, including. We take a life cycle costs lcc approach to pump design, enabling us to provide you with the right technology for your fluids and operating environment. Geological repository systems for safe disposal of spent nuclear fuels and radioactive waste second edition, 2017 related terms.
These pumps are typically not capable of such a high flow rate as say, a centifrugal pump, but they are capable of producing much higher pressures. It is mainly used in directional drilling operations. Pdf stator life of a positive displacement downhole drilling motor. These downhole drilling motors, coupled with measurements while drilling mwd tools and proper stabilization allow directional wells to be drilled with one bottom hole assembly.
Reciprocating pumps include piston, plunger, and diaphragm types. As drilling fluid is pumped through the positive displacement motor, it converts the hydrauli. Selection and integration of positive displacement motors into. The meters solid construction and excellent dynamic response are well suited to the measurement of fuels and oils as well as other nonabrasive lubricating. Positive displacement pumps are characterised by an operation that moves fluid by trapping a fixed volume, usually in a cavity, and then forces that trapped fluid into the discharge pipe. Positive displacement pumps is a current reference guide for positive displacement pumps for both traditional and stateoftheart testing methods, and serves as a bridge between textbooks and manufacturers literature by providing equipment testing practices based on technical knowhow, practical experience, and academic theory. The company positive displacement blowers are efficient, longlasting, robust and are used around the world. The performance and efficiency of hydraulic pumps and motors. Request pdf analysis of energy harvesting positive displacement motor drilling operations in deep and ultradeep water are increasing around the. A positive displacement blower, otherwise known as a pd blower or rotary air blower, is a type of machine that is used to move gas or air for a variety of applications. The pd pump range of operating conditions is presented in several. Stator life of a positive displacement downhole drilling motor article pdf available in journal of energy resources technology 1212 june 1999 with 2,227 reads how we measure reads. Pumps are classified on the basis of mechanical principles of operation as positive displacement pumps a reciprocating pump b rotary pump variable displacement pumps a centrifugal pump b turbine pump a.
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