Research and Application of Electric Submersible Pump Unit with Shroud
Research and application of electric submersible pump unit with shields Li Bo, Shao Lei, Cheng Shiquan, Wang Quansheng (Shengli Petroleum Administration, Rodless Extraction Pump Company). It will cover the centrifugal pump inlet, motor protector and submersible motor in it, forcing oil and wellhead influent from the lower end of the shroud through the submersible motor into the inlet of the centrifugal pump, which is beneficial for cooling the submersible motor and reducing crude oil. Viscosity increases the operating life of the electric submersible pump unit. Tests have proved that: (1) The ESP submersible pump unit equipped with a shield can be used in a low-yield thick oil well with a daily fluid volume of less than 30m3 and a crude oil viscosity of 1000mPa-s in combination with a surface water-mixing process; (2) the pump unit is brought down to production. Below the horizon, it can be continuously and normally operated in a well with a gas-liquid ratio of 400m3/t; (3) it can be successfully operated in large-diameter cased wells; (4) it can be run into a single-layer casing pocket well on the ground and can be used for low-pressure water supply. Implement leak-free pressurized water injection. Subject heading: Submersible oil pump guard Development and application of shroud is a kind of device that protects the normal operation of the submersible motor in the application process of the electric submersible pump (ESP). It will pump the population, the motor protector and the submersible motor by the centrifugal pump. Covering it, forcing the well fluid and wellhead injection fluid to flow from the lower end of the shroud through the submersible motor into the centrifugal pump suction population. Electric protective submersible pumps with hoods are suitable for the following four aspects. In the low-yield heavy oil wells, the electric submersible pump is equipped with a shroud, which can inject viscosity reducer or water from the wellhead, thereby reducing the viscosity of crude oil and increasing the flow rate through the submersible motor, not only meeting the requirements of multi-stage centrifugal pump lifting. , And is conducive to cooling the submersible motor and extend the operating life of the entire unit. In high oil-gas ratio oil wells, ESP substations with shields are installed in the lower part of the oil layer. Gases cannot enter the centrifugal pump, preventing air locks and ensuring continuous operation of the electric submersible pump unit. In low-production large-diameter cased wells, forced fluid flows through the annular flow path between the submersible motor housing and the shroud, increasing the heat dissipation of the submersible motor, and preventing the electromagnetic winding of the motor from being electrically insulated due to excessive temperature Rapid aging causes short-circuit faults and improves the operating life of the submersible motor. Install a hooded ESP in a sealed pocket well at the bottom of a single casing to provide a leak-free pressurized water injection for low pressure water. Structure and Auxiliary Covers Structure of ESP Unit with Shroud The structure of the submersible pump unit is shown. * Li Bo, Assistant Engineer, born in 1971, graduated from the Daqing Petroleum Institute in 1994 with a major in mechanical manufacturing. He is currently engaged in research, promotion and application of electric submersible pumps. Address: The upper part of the oil machinery cover is arranged with several suspension holes radially along the circumference of the housing. The screw is connected with the corresponding screw hole on the base of the separator to fix the shield on the electric submersible pump unit. The outer circle of the separator base assembled with the upper part of the shroud is designed to be eccentric with the axis a of the electric submersible pump unit (eccentricity is s), and a rectangular slot is introduced at the maximum eccentricity through the lead cable so that the lead cable can pass through the shroud The inner cavity is connected with the lead of the submersible motor. The upper housing of the shroud is inserted into the outer circle of the shaft center A of the gas separator centered on the axis A of the electric submersible pump unit. The matching of the shroud and the electric submersible pump unit improves the design of shrouds of different specifications according to the requirements of different series of electric submersible pump units. The length of the shroud depends on the length of the submersible motor and protector. In order to facilitate the manufacture and transportation, the length of each guard is not more than 5.5m. The matching use of the guard and the components of the ESP unit is shown in Table 1. Table 1 Dimensions of the guard outer diameter of the shield and the components of the ESP unit Model Centrifugal Pump Model Separator Model Protector Model Applicable Minimum Diameter Bushing Field Test ~September, an electric submersible pump with shroud was tested on three low-yield thick oil wells. s, The pump hanging depth is 2350m, and the daily production volume is 27.1m3. To cool the submersible motor, 60 to 70 feet of hot water is added at a flow rate of 1.41.6m3/h from the oil casing annular space. Initially due to the uneven mixing of water on the ground, the unit was often under-loaded and shut down. After uniformly mixing water as required, the production was normal. The total volume of oil wells per day was 63.lm3, and the daily oil production was 10t. No. 2 wells were produced with conventional electric submersible pumps. Less than one month after operation, the submersible motor was changed to an electric submersible pump unit with a shroud due to an overheated short circuit of the submersible motor. The well has a crude oil viscosity of 387 mPas, a daily fluid production volume of 21.65 m3, a wellhead water content of 1.5 m3/h, an oil well total discharge volume of 57.65 m3, and an average daily oil production of 624 tons. The well was brought under protection in September 1998. The electric lagoon unit has a viscosity of up to lmPas at normal temperature, a daily output of 30m3, a daily output of 10 tons, and a wellhead water intake of L5m3. From the operation of the above three-way shielded electric wells, the wellhead is controlled. The amount of water is very important. If the amount of water is not enough, the unit will cause under-load shutdown. Compared with conventional electric submersible pumps, there is a significant increase in the period of trouble-free operation of shunt-charged electric snorkeling in low-yield thick oil wells. Application in high oil/gas ratio oil wells In high oil/gas ratio wells that seriously affect the normal operation of multi-stage centrifugal pumps, the shroud ESPs can be brought below the production horizon, using the gravity separation of oil and gas in the wellbore. Limit or avoid gas through multi-stage centrifugal pumps. By releasing part of the gas from the well casing valve, the pressure in the annular space of the oil casing is controlled to prevent the under-load shutdown of the electric submersible pump unit due to the air lock of the multi-stage centrifugal pump. The increase in the degree of sinking of the multi-stage centrifugal pump facilitates the suction of the pump. In 1999, a hooded ESP was applied in No. 4 well. The well depth was 2400m, and it was covered with a hood electric submersible pump down to 2450m. The pump was mounted 50m below the reservoir, and the daily production volume was 30m3 after startup. The gas-liquid ratio was 40m3/t. , Well casing pressure up to 12MPa, casing production gas 12000m3, gas and liquid separation, can always pumping. In the case of large-casing low-production oil wells, large-scale low-production oil wells and small-diameter submersible electric submersible pump units require an electric submersible pump with a shroud to increase the flow rate of the well fluid around the submersible motor casing. In October 2000, a 0244.5mm (9% inch) production casing was drilled into the YQY116 electric dirigion unit. The 0138mm shroud was used to ensure the cooling conditions of the submersible motor at a daily output of 50m3. To maintain the normal production of oil wells. The electric submersible pump with shield can be used in a single-layer casing pocket well. The water injection pump station pressurizes the water to enter the pocket well from the wellhead, and returns from the outer side of the shield to the bottom of the human shield and the submersible motor. The annular space reaches the centrifugal pump and sucks the population. After being pressurized by a multi-stage centrifugal pump, it injects a water injection well. This provides a simple and convenient method for improving the water injection pressure at certain well points. In October 1998, this method was used to inject water for two injection wells in Shengli Oilfield. The water pressure at the injection pump station was lOMPa, the multistage centrifugal pump increased the injection pressure to 25MPa, and the total daily water injection volume was 300m3. The pump unit operating noise was small. Pollution, there is no need to build a factory building, and the daily maintenance workload is small, and it has been operating normally. The ESP submersible pump unit with cover can be applied in the low-yield heavy oil well with the daily output of less than 30m3 and the viscosity of the crude oil up to 1000mPas. The electric-submersible pump unit with the shield can be applied below the production floor and can be used in gas and liquid. More than 400m3/t of the wells are continuously operating normally; the shroud ESPs can operate successfully in low casing oil production wells; ground-single pocket wells are equipped with shrouds and electric submersible pumps, which can be used to pressurize certain wells. Water injection. (This article edited by Wang Zhiquan)
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