RU134251U1 - PUMPING WATER PUMPING STATION IN OIL LAYER - Google Patents

Abstract

A pumping station for injecting water into an oil reservoir, comprising a main and standby pumps for increasing the pressure of the injected water, an inlet duct for supplying water to the pump and a high-pressure discharge duct from the pump to the distribution comb, automation and control of technological parameters of the pumps, that the inlet and outlet water conduits are equipped with sensors for the content of oil products in water with the function of transmitting information to the control room and controller of the pumping station.

Description

Adjusted description on request of FIPS dated 04/18/13 The utility model relates to the oil industry, in particular, to

stationary or block pumping stations for pumping water into the reservoir and to the preliminary water discharge installations. It can be used in oil gathering and formation water treatment systems in oil companies of the country.

The well-known "Installation of separation and purification of associated produced water with oil of water" (RF patent for the invention No. 2460568, publ. 09/10/2012), in which to prevent the ingress of oil particles into the intake pipe of the pumping station, the quality of the water supplied to the consumer is controlled using a sensor in as an interphase level meter located in a section of water from oil. The interphase level gauge shows the transition zone from water to oil and does not control the quality of the water itself. Meanwhile, according to well-known regulatory requirements, the content of petroleum products in the water pumped into the oil reservoir should not exceed 50-60 mg / l. For reservoirs with low permeability, this indicator is even lower. According to the invention, after such an installation, it is not excluded that water with finely dispersed oil with a concentration exceeding the normative can get into the intake of the pumping station.

Known installation of discharge of associated water (RF patent for the invention No. 2314140, publ. 10.01.2008, bull. No. 1) by which the transition zone from oil to water is cut off in advance by a mechanical device, namely a ball with an intermediate density that blocks the flow of water. The installation has the same drawback as the first prototype.

Known application for invention No. 2007117763/15 of 01/01/2005 "Method and installation for removing organic matter from the associated water of the oil field." The invention obtained by the authors proposed more than 30 technical methods for the treatment of produced water from oil products, in particular, the use of adsorbents and an electrolyzer for the decomposition of organic compounds. But according to the invention, the issue of continuous monitoring of the quality of the water supplied to the pumping station for injection into the reservoir is not resolved.

Today, the quality control of the water injected into the oil reservoir is carried out periodically by taking water samples from the discharge conduit and further studying it in the laboratory.

The objective of the claimed utility model is to ensure at the pumping station constant quality control of the injected water into the oil reservoir by the parameter "concentration of oil products in water". The technical result of the proposed solution should be the impossibility of water entering the pumping station from water treatment plants with a concentration of oil and oil products above the permissible value for a given development object - an oil reservoir or its section.

The stated technical problem is solved in a pumping station for pumping water into an oil reservoir, containing a primary and backup pumps to increase the pressure of the injected water, an inlet duct for supplying water to the pump and a high-pressure discharge duct from the pump to the distribution comb, automation equipment and control of technological parameters of work pumps, in that the inlet and outlet water conduits are equipped with sensors for the content of oil products in the water with the function of transmitting information to the control room and controller of the pumping station .

If the concentration of oil products in the water exceeds the normalized value, according to at least one of the two installed sensors in the control room or the pump station controller, a decision is made to stop the working pump to prevent the supply of water with oil to the injection wells of the reservoir.

The proposed pumping station is shown schematically in the diagram, where 1 - pumps for pumping prepared water into the oil reservoir, 2 - inlet pipe for supplying water to the pumps, 3 - discharge pipe - pressure pipe from the pump to the distribution comb, 4 - sensor for the content of oil products in the water inlet water conduit, 5 - sensor for the content of petroleum products in water at a flow conduit.

The indicated sensors at the station should be two for two reasons. It is well known that the state of water according to the “homogeneity” parameter in the inlet and outlet water conduits of the station is different due to the presence in the water of oil products, gases in a different state (free and dissolved) and mechanical impurities in the form of particles of oil reservoir rocks and corrosion products of oilfield equipment. The oil products contained in the water are in the inlet and outlet water conduit in various volumetric forms. As a rule, in the inlet conduit, water moves in a laminar mode with a small pressure of 0.2-0.8 MPa. In such "calm" water, finely dispersed petroleum products float and collect in the upper part of the water conduit. To determine the volume concentration of oil products in such water, one type of sensor is required. Due to the intensive mixing of water and oil products in the discharge water conduit by the working parts of the pump, oil products are evenly distributed in the volume of water moving in the water conduit. In this case, a different type of sensor is used - a sensitive capacitor with plates placed along the inner generatrix of the water conduit can be used.

The second reason is the possibility of failure of one of the sensors. During its recovery, the quality control of the water injected into the reservoir will be carried out using a second sensor.

Despite the different types of sensors, their readings on the concentration of oil products in the water in the existing pumping station should be the same or differ by an acceptable and regulated value.

Consider the operation of the pumping station at various concentrations of petroleum products (KH) in the injected water in tabular form. For this oil production facility, the design documents adopted two limit values of oil products:

1. 60 mg / l - the maximum allowable value of oil products in water during normal operation of the water treatment plant and pump station.

2. 600 mg / l - the maximum allowable value of oil products in water during emergency operation of the water treatment plant and pump station.

The concentration of petroleum products in water, mg / l Decisions made and pump station operating mode On the sensor at the inlet conduit According to the sensor at the outlet 0-60 0-60 The water treatment plant (UPV) and the pumping station (NS) are operating normally 61-600 61-600 Based on a signal from the control center, the personnel of the UPV and the NS find out the reason for the situation of excess of oil products in the water. The pump station is working or not working by decision of the technical director of the enterprise. 601 and more 601 and more The operation of the pumping station is stopped by the controller after repeated notification to the personnel of the National Assembly and the UPV.

The use of sensors for the concentration of oil products in water at the pipelines of the pumping station solves the technical problem posed with a positive result - it will become impossible for the oil and oil products to fall above acceptable limits. Such sensors should play a particularly important role at night with limited personnel in the water treatment plant and pump station.

Claims (1)

A pumping station for injecting water into an oil reservoir, comprising a main and standby pumps for increasing the pressure of the injected water, an inlet conduit for supplying water to the pump and a high-pressure discharge conduit from the pump to the distributor comb, means of automation and control of the technological parameters of the pumps, that the inlet and outlet water conduits are equipped with sensors for the content of oil products in the water with the function of transmitting information to the control room and controller of the pumping station.

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