RU2343273C1 - Hydro responsive element - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention refers to operation of oil and gas deposits and can be employed at restoration of intake capacity of pressure wells. The aluminium case of hydro responsive element is made as a hollow aluminium cylinder with plugs in form of cartridges turned inside the cylinder, and is filled with water solvent saline insertion below forming upper plug positioned at the low level; the said insertion inhibits interaction with active mass of composite material - dispersion of aluminium in sodium with possibility of change of isocaustic relation.

EFFECT: increased efficiency of complex effect at boundary of conjugation of well and bed system without termination of pumping.

2 cl, 2 dwg

Description

The invention relates to the field of exploitation of oil and gas fields and can be used in reservoir pressure maintenance systems.

The specificity of the domestic oil complex is that in the vast majority of fields being developed, a well-developed reservoir pressure maintenance system is used. In the early stages of development, water resources are used. the source of which is natural bodies of water. As the fields are being exploited, water cut increases and the sources for RPM systems are mainly return water after separation of marketable oil and preliminary treatment for injection. Over time, the injectivity of injection wells of the RPM system decreases. The main reason is the mudding of the interface surface between the well and the reservoir system, called the bottomhole formation zone (FZP), with mechanical impurities and oil products with a high content of asphaltenes.

A known method and device for removing asphalt resin and paraffin hydrate (ASPG) deposits [US Pat. RF 2123101, priority from 01/30/96]. The device for removing ASPG deposits includes a body filled with a chemically active substance capable of interacting with water, and is characterized in that the body is made in the form of a cylindrical shell of aluminum or its alloy, has a free volume inside the shell, and metal sodium is used as a chemically active substance. In this case, the inner diameter of the housing in the lower base is equal to the outer diameter in the upper base for connecting the devices to each other using the free volume inside the shell. In addition, the mass of the housing in relation to the mass of metallic sodium is not more than 1/3.

In the known device due to the active interaction of sodium with water, hydrogen, heat and active alkali are released. The device can be used to destroy asphalt-resinous and paraffin hydrate deposits in the tubing of production wells. The principle of operation is similar to a jet propulsion. Its use in reservoir pressure maintenance systems is possible, but is associated with an unreasonably high parasitic sodium flow during the movement of the device under the action of a reactive component from the wellhead to the bottom.

The hydroreacting element [Ratent of the Russian Federation No. 2275494, priority date 04/05/2004], which includes an aluminum cylindrical glass, is more advantageous. filled with an active mass based on sodium metal, a protective waterproofing layer that is removed before use, the specified protective layer is a paraffin-based composition, an insert made of a mixture of sodium nitrate and sodium hydroxide is placed between the active mass and the protective layer, which provides a delayed interaction specified active mass with an aqueous solution. Moreover, the ratio of the cross-sectional areas of these active mass and the glass is preferably not more than 50.

The latter is adopted as a prototype for the maximum coincidence of essential features. The prototype has one significant drawback. It can be used to treat bottom-hole zones of injection wells during periods combined with underground repairs, or when pumping into wells stops. In existing RPM systems, its use is difficult due to the need to relieve excess pressure to enter the well.

The technical task of the invention is the creation of a hydroreacting element adapted for use in existing systems for maintaining reservoir pressure without stopping the injection.

The technical solution to the problem lies in the fact that the hydroreacting element comprising an aluminum body filled with an active mass based on sodium metal and a salt water-soluble insert, characterized in that the body is made in the form of a hollow cylinder with plugs in the form of glasses facing the hollow cylinder, a water-soluble salt the insert divides the active mass at the lower level of the generatrix of the upper plug filled with sodium, and the body below the salt insert is filled with a dispersion of aluminum in sodium.

The content of the aluminum dispersion is preferably not more than 40 wt.%.

The essence of the claimed technical device lies in the fact that the top cap, which seals GREL from the side of the salt insert, is perforated before using the element to contact water with the active mass. In this form, the element is lowered into a standard lubricator. When the lubricator cavity communicates with the borehole volume by tearing off the buffer valve or a special shut-off device, the aqueous solution comes into contact with the surface of sodium metal through perforations in the plug. Due to the reactive component, the GREL starts from the cavity of the lubricator, is picked up by the flow of an aqueous solution and moves to the bottom. As the active mass in the plug is exhausted, the interaction stops and resumes after the salt insert is dissolved directly at the bottom. To ensure the effectiveness of the processes of leveling the displacement front (depending on the specific geological conditions), there is the possibility of changing the caustic ratio. The predominant ratio in favor of sodium is realized in the early stages of development, when the danger of jet displacement is minimal. In the late stages of development, the possibility of devices with a high content of dispersed aluminum in the active mass is realized when the yield of the solid phase during dilution of the reaction products in the formation is maximum.

The essence of the proposed technical solution is illustrated by drawings.

In Fig.1 presents GREL Assembly and ready to use. The device is presented in a lubricator. The active mass 2 is contained in the hollow cylinder 1 and in the plugs 3.4, isolating the active mass from the access of atmospheric moisture. A water-soluble salt insert 6 is provided at the lower level of the generatrix of the upper plug 3 in the housing. Immediately prior to use, the end surface of the upper plug 3 is perforated and the GRAH is introduced into the lubricator 7. When the perforator cavities communicate with the internal tubing volume (ball valve 8), water fills the lubricator cavity and contacts the active mass through perforation of the end surface of the plug 5. The reactive component of the interaction gives an impulse and GREL starts deep into the tubing. After the active mass in the plug 3 has been exhausted, the active interaction will cease until the water-soluble insert 6 opens access to the main active mass of the GREL.

Figure 2 presents a diagram reflecting the capabilities of the claimed design of the GREL for varying the sediment-forming potential. So, the isocaustic section of OQ leads to the fact that with a slight dilution in reservoir conditions, precipitation of aluminum hydroxide occurs. At the same time, the isocaustic ratio of OS excludes the formation of sediment upon dilution. Intermediate ratios (OL, OK) allow you to vary the intensity of sedimentation in relation to specific conditions.

Claims (2)

1. A hydroreacting element comprising an aluminum body filled with an active mass based on sodium metal, and a salt water-soluble insert, characterized in that the body is made in the form of a hollow cylinder with plugs in the form of glasses facing the inside of the hollow cylinder, the water-soluble salt insert divides the active mass into the lower level of the generatrix of the upper plug filled with sodium, and the body below the salt insert is filled with a dispersion of aluminum in sodium. 2. The hydroreacting element according to claim 1, characterized in that the content of the dispersion of aluminum is preferably not more than 40 wt.%.

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