Development and Application of Multifunctional Long Plunger Pump

Key words: Suction pump, Heavy oil mining, Steam injection, Long plunger, Traditional 1 Overview The types of injection pump and dual-purpose pump currently used for heavy oil thermal recovery There are many types of injection and production dual-purpose pumps currently used in Xinjiang Oilfield. Pump, full house pump and traditional long plunger pump. These dual-use pumps have their own advantages and disadvantages. The thermal rod pump is not reliable when the oil viscosity is high, and the maintenance of the pump is relatively tedious. Due to its structural limitations, the feedback pump can easily cause tripping between the upper and lower pump cylinders, resulting in workover operations. Full house pump before the injection of steam need to lift the ball in the process of Vernier, difficult to determine, the actual operation often missed the ball. Although the traditional long plunger pump has unique advantages, both the pump cylinder and the plunger are two-body, it is difficult to ensure the concentric requirements of the upper and lower two sections, and the unreasonable position of the steam injection collar causes the pump to be in operation. Excessive pump efficiency decreases. In order to solve the above problems, we proposed a new design idea. Based on the advantages of the traditional long plunger pump, the multi-functional long plunger pump adopts the integral pump barrel and integral plunger structure to optimize the structure and position of the steam injection hole, and the performance is more superior.

The working principle of the 2 multi-functional long plunger pump The multi-functional long plunger pump In the production of steam injection, only the plunger needs to be pushed down (or rely on the gravity of the sucker rod) so that the plunger falls into the pump cylinder (pump The structure of the cylinder is as shown. The upper steam injection hole is open. At this time, the steam is guided into the bottom of the well through the steam injection hole on the pump cylinder and the injection guide (shown in Fig. !) is completed. steam.

The multi-functional long-piston pump can lift the injection hole on the pump cylinder by lifting the plunger during the pumping process and the effective sealing section of the plunger will always seal the pump barrel during the entire stroke range of the plunger. At the steam hole, and there is always a section of the plunger exposed on the outside of the pump cylinder, which reduces the gap between the plunger and the pump cylinder to reduce the wear of the sand cylinder to the pump barrel and the plunger, so it has a certain function of sand control.

The multi-functional long-piston pump is more reliable than other types of pumping pumps when it performs steam injection.

3 Structure features The structure of the traditional long plunger pump is shown in the figure. The pump barrel and plunger of the pump are divided into two bodies. The pump sleeve is located in the middle of the pump barrel and serves to connect the upper and lower pump tubes and act as a steam injection channel.

The plunger is also connected through the plunger collar. Due to the separate structure of the pump cylinder and the plunger, it is difficult to guarantee the concentricity of the upper and lower two sections of the traditional long plunger pump. At the same time, the injection collar is located in the middle of the pump cylinder. 1The engineer knows that - the material graduated from the Xinjiang Petroleum Institute of Chemical Engineering Ashing traditional long plunger pump structure schematic - pump tube steam coupling; 2- plunger coupling to make the pump in the work of the clearance volume is too large, pump efficiency reduce.

The multi-functional long-piston oil pump has improved design based on the shortcomings of the traditional long-piston pump, combined with advanced processing technology.

The structure is as shown, the improved long plunger pump cylinder replaces the traditional split structure with an integral structure, and a steam injection hole is opened in the plunger to replace the traditional steam injection coupling. Before considering the improvement of design, factors such as the size requirements of the steam injection channel, the strength requirements of the pump hole opening, the required amount of leakage of the pump and other factors shall be taken into consideration. The position of the injection hole, the structure of the hole and the size of the hole shall be reasonably designed. The improved pump cylinder structure solves the problem of pump cylinder misalignment of conventional long plunger pumps. The plunger also uses an integral structure to solve the misalignment of the plunger due to the segmented structure.

The multi-functional long-piston pump is designed with a steam-injection shroud to guide and inject steam. This reduces the high-temperature, high-pressure steam damage to the casing and improves the reliability of the pipe string. Introduction of steam injection guide cover Bu 2 Bu 5 Multi-function long plunger suction pump Structure schematic diagram Injection steam injection As shown, the arrows indicate the flow of injected steam.

The structure of the multi-functional long plunger pump not only has the advantages of the traditional long plunger pumping structure, but also carries out the necessary improvement design, making the performance more superior.

4 Technical parameters The length of the pump barrel can be divided into 3 plunger lengths according to different strokes. According to different strokes, it can be divided into 2 sucker rod connection threads and sucker rod buckles.

5 Field applications Multi-functional long-piston oil pump From October 2004 to November 2005, 193 wells have been applied in the oil production plant of Xinjiang Oilfield, with good results, and it has been praised by the users. The production data of the oil pump for the DY025, DY026, DY035, and DY041 wells in the No. 951386 well, No. 951106 well, and the low-efficiency oil field in the company's operations are shown in Table 1. All six pump units have been pumped and produced. So far, the multi-functional long-piston pump works well.

Table 1 Multi-function Long Plunger Pumping Pumping Production Statistics Statistics No. Note Elapsed time (2) Wellhead pressure (MPa) Vapor vapor dryness t6) Steam injection (t) Draw (2) Liquid production (t) Oil The oil temperature (8) multi-functional long-piston pump was used for steam injection in all six wells. The steam injection process did not show the pressure of the steam injection boiler during normal operation of the steam injection process, demonstrating the multi-functional long plunger pump injection steam channel. The size of the design is reasonable, to meet the steam injection production requirements. At the same time, the multi-functional long-piston pump works well in pumping production and the oil well output is stable.

Responsibility editor Zhou Jiang 1 on the coupling; 2- injection steam guide hood; 3- pump cylinder; 4- plunger;

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