The first PCP pump run in an oil well was done by Griffin Pumps in September of 1980 at Lloydminster Saskatchewan Canada and, based on the conclusions of the test, 5 additional were run in January 1981. These kinds of applications were bleary heavy sandy oil wells. As then the PCP pushes have been applied in lighter, higher water slice wells of up to 35 API and 95 % water and quantities as high as 600 m3/day. pompederelevage.info
The screw pump advantage over other varieties of artificial lift such as beam pumping and ESP is that it can deal with solids such as sand and operate in an additional monetary cost with less maintenance.
The PCP pump can greatly increase the economics of a field in two ways
A) decrease capital cost
B) lower functioning cost
Another good thing about the screw pump system is which it uses the same tubing and rods as conventional beam pumps and the rotor landing methods act like that of space out the plunger on a conventional rod pump. This results in minimum amount practicing service rig employees.
The principle of the PCP pump is to generate pressure and lift up the fluid. This is done by creating identical and distinct cavities everywhere over the pump length as the rotor rotates in the stator. Some pumps will have as many as 50 or additional major, depending on lift requirement. The differential pressure necessary to lift the fluid is then split up evenly of most the major. Therefore, over a pump with 50 cavities, the differential box pressure across each tooth cavity is 1/50th of the total requirement.
Together with the differential box so low across each cavity, softer elastomers that can handle sand can be used.
Pump action occurs when the brake disc is turning in a clockwise direction in the stator and each rotable of the rotor will displace 2 cavities and create 2 cavities at the inlet of the pump. The main reason for this is the fact that, in a PCP pump, the brake rotor is an external sole helical gear and the stator is a two times internal helical gear. This kind of is what is commonly termed as a 1: 2 angles pump.
Therefore you can increase and minimize the output of the pump by merely changing the rotor speed. Speed is pertinent to production. In theory, the faster the rotable of the rotor, the higher the outcome of PCP pumps. Some of the creation of the pump will vary and will be somewhat less that the theoretical production, due to pump slip. As you may improve the differential pressure over the pump the slip volume boosts. To offset the go also to keep a frequent development volume, you can improve the speed.
As you sketch the fluid level down, the differential pressure boosts and the slip will also increase resulting in a decrease production rate. This is what is referred to as pump efficiency.
The PCP pump slip can be manipulated by rotor /stator fit, by by using a tighter fit for higher efficiency and low speed for heavy oil and a sagging fit for lower efficiency and higher speed for light oil.
The pump has two parts: the rotor and the stator. As much as repair and maintenance of these two components is concerned, once the stator is damaged or the rubber is inflammed, it must be replaced; the rotor can be rechromed if there is no injury to the core itself.
The drivehead contains 3 parts: the bearing that holds the rod weight, the back spin control and the drive device. There are many types and styles of pushes made all over the world; nevertheless , they all incorporate the three basic functions of the drivehead.
All drive heads include a backspin retarder or brake that controls the spring torque stored in the rod string.
The moment the unit is close down or looses ability, the rod torque will unwind and, as the fluid level equalizes, the downhole screw pump converts into a motor, making the rod string above the bottom. Therefore, it is very important to have a check regulators on the flow range as near the well head as possible, to quit the fluid from streaming from the flow series back down the well.