Numerical Simulation of Propeller Rotation of a Plunger-shrunk Tube Pump

Design and calculation of the numerical simulation of the propeller of the plunger rotating tube tube pump Lu Guangli1, Zhu Hongwu2, Zhang Jinya2 (1. Beijing Guangli Technology Co., Ltd. 2. China University of Petroleum, Beijing) Suction tube pump. The key part of the pump is the plunger self-rotating body and the hemispherical rotary fixed valve. There is an propeller inside the plunger's rotating body. When the fluid flows through the propeller, it can generate torque for the propeller and push the propeller to rotate together with the plunger. , to achieve the purpose of sand removal. The CFD software was used to do numerical simulation of the flow field at the propeller. The results showed that in one stroke, when the fluid flows through the propeller, it can generate enough force to rotate the propeller with the propeller to rotate 5.72°, which meets the design requirements. Solve the problems of sand cartridge and sand burial of the pump barrel.

Fund Project: Key Project of Mechanical Engineering of the Beijing Municipal Education Commission Key Project (XK114M0594). This product has obtained the national patent, patent number: ZL022 At present, the commonly used domestic oil pump is the American conventional oil pump. This type of pump is a single linear operation during the up and down operation. The problem of sand card and sand burying in the pumping process is quite serious. Taking the situation of the No. 1 Oil Production Plant in Dagang Oilfield as an example, from the analysis of statistical data on the shutdown wells of the oil production plant in 2005, it can be seen that sand cards and sand burial stopped production for 76 times, accounting for 30.65% of the number of shutdowns. Therefore, sand Card and sand buried production wells are still the main content of maintenance operations. The Midway Sunset oil field in the United States is a porous Potter sandstone reservoir. The sand damage makes the failure rate of the pump very high. Although some sand control measures are taken, the effect is not obvious. Within 2 years after the use of the rotary piston pump, the downhole maintenance cost was reduced by 37%, the inspection pump frequency was reduced by 51%, and the pump maintenance cost was reduced by 48%. For this reason, China University of Petroleum (Beijing) and Beijing Guangli Technology Co., Ltd. The company has jointly developed a plunger rotating tube pump with full rotation. It has been tested in oil fields such as Liaohe, Shengli, Dagang, Nanyang and Jianghan since 2002 and has achieved good results. It has solved the sand card in the pumping process. Sand burying problem, increase pumping efficiency 5%~8% at the same time, increase liquid production volume 25%. Structure and working principle Plunger self-rotation The whole barrel type pump is composed of pump barrel, oil tube cyclone, plunger self-rotating body and hemisphere Rotary fixed valve structure. The tubing swirler is located in the upper part of the pump and the hemispherical rotary fixed valve is located in the lower part of the pump. Its structure is shown in the figure.

Plunger rotation tube pump structure of the entire schematic diagram of a sucker rod; 2 - tubing cyclone; 3 - plunger rotation tube pump tube; 4 a self-rotating plunger assembly; 5-hemisphere Rotary fixed valve 2. Working principle The key part of the plunger rotating tube tube sucker is the plunger rotating body and hemispherical rotary fixed valve. When the fluid flows through the self-rotating body of the plunger, the liquid flow spirally rises along the spiral groove of the propeller within the rotating body. During the spiral flow, a pressure difference is generated on both sides of the propeller blade, thereby generating a moment and pushing the propeller to rotate. The upper end of the plunger is connected with the swirling rod, and the propeller pushes the plunger to rotate downwards in the direction of thread tightening. The scraping groove of the outer working surface of the plunger scrapes the scales and sand particles in the gap between the pump cylinder and the plunger. In the tank, keep the working section of the plunger clean and eliminate sand cards. The cyclone at the upper end of the plunger rotates during the process of the plunger siphoning crude oil, agitating the raw liquid to prevent the deposition of sand on the top of the plunger, and solving the problem of sand burying on the top of the plunger.

The main reason for the low performance of conventional chestnuts is that the ball valve has more than one impact on the base and cannot be quickly closed, causing fluid loss.

At the same time, fine sand particles are often deposited on the sealing belt of the valve seat, causing damage to the sealing tape. When the sealing tape reaches a certain level, the sealing will not be strict, the leakage will be formed, and the pump efficiency will be reduced. The hemispherical self-rotating fixed valve of the plunger rotation self-rotating tube pump adopts energy storage resetting device, which can shorten the closing time of the half ball valve. The hemispherical valve rotates to agitate the liquid to prevent sedimentation of the sand and prevent damage to the sealing tape during impact. Rotary seal At the same time, it can also eliminate the impact of magnetic, to protect the fixed valve seat. At the same time, the hemispherical design increases the pressure when the ball valve is closed, so that the ball valve can not be bounced twice to avoid liquid leakage and play a role in improving pump efficiency.

The numerical simulation of propeller propeller is a key component of the self-rotating body. It is connected with the plunger through the thread. The force generated by the fluid flow causes the propeller to rotate together with the plunger to achieve the purpose of sand removal. Therefore, the author did a numerical simulation of the flow field at the propeller, and obtained the pressure situation of the propeller blade when the fluid flows through the propeller, and then the torque generated by the fluid to the propeller is obtained, and due to the fluid medium The resistance resulting from stickiness is compared to determine whether the spin prize in the pumping process can be rotated according to the design purpose.

It is a propeller model diagram built in Pro/e. According to the characteristics of the flow field at the propeller, the flow field is divided into two parts to facilitate the division of a more reasonable grid. The total number of flow field grids is 238,700, as shown.

The boundary conditions of the flow field calculation grid map at the propeller: The entrance is a speed population; the exit is extended at the exit of the propeller, and is set as a free outlet boundary condition; the wall surface is a non-slip wall boundary condition.

Under the operating conditions of 104m3/s, the flow field at the propeller was simulated with Fluent software. The medium was crude oil, the density was 9kg/m3, and the dynamic viscosity was 2Pa.s. The Reynolds stress model was selected for the turbulence model and the iteration error was calculated as 1 Iteratively obtained the flow field conditions at the propeller, and 5 is the static pressure distribution cloud diagram of the propeller suction surface and the pressure surface, respectively. Analysis of the two graphs can be clearly found: along the spiral surface, the pressure changes evenly and there is no sudden change; in the same radial position, the static pressure corresponding to the pressure surface is significantly higher than the static pressure corresponding to the suction surface. The output torque of the single blade of the software is 0.0957Nm, then the total torque generated when the fluid flows through the propeller to the three blades is 3x0.095. The static pressure distribution cloud diagram of the propeller pressure surface at the same time, due to the viscosity of the fluid, the opposite direction friction will be generated. Force to stop rotation of propeller. The simulation results show that the viscosity of the fluid can be the moment of resistance of a single blade. 31 Nm, when the fluid flows through the propeller, the effect of the viscosity of the fluid on the 3 blades is the total torque on the propeller blades. 287 10.0930=0.1941Nm, this torque pushes propeller rotation. The radius of the propeller blades is 16mm, which simplifies the force of the fluid to the propeller as the force acting on the tip of the blade. The calculation is available as F = 12.13N0. The propeller and the plunger are connected by threads, and the propeller rotation drives the plunger to rotate. The plug fits in with the pump cylinder clearance, so the plunger is also subject to viscous drag between the pump cylinder and the plunger. According to Newton's internal friction law, the viscous shear stress F - tangential viscous resistance between the pump cylinder and the plunger, F = A - the area between the plunger and the pump cylinder, - the chestnut and the plunger Between the gap speed ladder ay degree; du - tangential speed change between the chestnut and the plunger with the gap; d) one pump cylinder and plunger with clearance, take = set the pump impulse is 5mirT1, The first half of the time required for the conclusion of the first stroke: Lu Guangli, a junior engineer, was born in 1937 and graduated from the Second Institute of Artillery Artillery (now the Missile Academy) in 1959, mainly engaged in research and development of pumping equipment. . Address: (100070) Beijing. Electric-06-29 (Edited by Ding Liping) Through the numerical simulation of the self-rotating plunger tube pump's self-rotating body, it can be concluded that within one stroke, the fluid can produce enough when flowing through the propeller. The propeller is driven to rotate the plunger together with 5.72°, which meets the design requirements and solves the problem of sand card and sand burial of the pump barrel.

As a new type of oil pumping pump, a plunger rotating tube-type oil pump can prevent the phenomenon of sanding in the pump tube, which is one of the means to reduce the workload of maintenance work.

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