A method of manufacturing a sealed capsule

 

The invention relates to the oil industry and can find application in the production of sealed capsules for treatment of oil and gas wells. A method of manufacturing a sealed capsule involves placing pieces of alkaline, alkaline-earth metal or of an alloy based on it in the form. Is then formed by pressing the inner part of the sealed capsule. After it is placed in a metal sheath and sealed metal casing. Sealed capsule is prepared in the form of a semicylinder with the inner part in the form of a circular rod with a longitudinal axial recess. When molding by pressing the inner part of the sealed capsule is formed into first semicircular rod. Then punch in the form of a round rod or cylinder is formed into a longitudinal axial semi-circular recess in the rod. In forming longitudinal recesses punch in the form of a round rod or cylinder crank. Before placing in a metal sheath inner part of the sealed capsule wipe cleaning cloths moistened with hydroxyl-containing organic compound. Improved manufacturability and reliability Hermetists the label in the production of sealed capsules for treatment of oil and gas wells.

A known method of manufacturing a device for thermo-chemical treatment of wells, including filling aluminum perforated tube melt of sodium and fill the perforations and the ends of the tube with a water-repellent composition (patent of the Russian Federation 2098605, CL E 21 In 37/06, published. 1997).

The method of ethnological, flammable and explosive.

A known method of manufacturing a device (capsules) to remove asphaltoresinparaffin and/or parfenovitch deposits, including the manufacture of the rod from alkaline, alkaline-earth metal or of an alloy based on it, placing the rod in a metal sheath, and applying an insulating coating (patent RF 2122628, CL E 21 In 37/06, published. 1998).

The known method of ethnological, does not provide reliable sealing device (capsules).

Closest to the invention to the technical essence is a method of manufacturing a sealed capsule, including the application of an insulating coating on the inner surface of the metal shell, cutting the amount of alkaline, alkaline-earth metal or alloy on the basis of bars, the location of the bars one after the other in the mold with the nozzle of circular cross section made of antifriction material is practical form for final impart a cylindrical rod, the location of the rod in the metal mold, the settling of the rod to its adhesion to the walls of the metal casing, the free ends of the metal shell coating the insulating coating and sealing ends (RF patent 2153573, CL E 21 In 37/06, published 2000 - prototype).

The known method of ethnological, does not provide a reliable sealing of the capsule.

The invention solves the problem of improving the manufacturability and reliability of the sealing of the capsule.

The task is solved in that in the method of manufacturing a sealed capsule that includes the location of workpieces from alkaline, alkaline-earth metal or of an alloy based on it in the form, molding by pressing the inner part of the sealed capsule, its location in a metal sheath and the sealing metal shell according to the invention, to prepare a sealed capsule in the form of a semicylinder with the inner part in the form of a circular rod with a longitudinal axial recess in the molding by pressing the inner part of the sealed capsule is formed into first semicircular rod, and then punch in the form of a round rod or cylinder is formed into a longitudinal axial semi-circular recess in the rod, when foam in a metal sheath inner part of the sealed capsule wipe cleaning cloths, soaked hydroxyl-containing organic compound.

The invention is Sealed capsules are intended for processing bottom-hole zone of the well, for cleaning oil and gas wells from asphaltoresinparaffin and/or parfenovitch sediments. In the manufacture of sealed capsules it is necessary to ensure the integrity of each capsule. During the descent sealed capsules into the well when unwanted or untimely contact with alkaline, alkaline-earth metal or of an alloy based on it with the water of the well fluid is late reaction, resulting in useless expenditure of sealed capsules, from achieving the goals of the treatment well and perhaps to the emissions from a well-heated liquids. In the proposed method solves the problem of increasing the reliability of the sealing of the capsules and improve the manufacturability of the capsules. This uses the plasticity of alkaline, alkaline-earth metal or of an alloy based on it, i.e., the ability to change shape under load at room temperature and high pressures.

The method is as follows.

Prepare a sealed capsule in the form of a semicylinder. In Fig.1 .2 presents the cross-section a-a in Fig. 1. Here 1 - metal (aluminum) shell, 2 - inner part of the sealed capsules of alkali, alkaline-earth metal or of an alloy based on it.

In the manufacture of the inner part of the sealed capsules from the amount of alkaline, alkaline-earth metal or alloy on the basis of cut (cut) of the workpiece, usually in the shape of a bar with uneven edges. The bar compresses to align the edges and placed in a mold. In Fig.3 shows a diagram of the molding with a flat punch. In the form 3 is formed into a flat punch 4 the inner part of the sealed capsule 2 in the form of a circular rod. Pressing is carried out by pressing of the formed parts. Pressing necessary because during compaction in a single pass, the item usually is destroyed. Then in the same form is formed into a longitudinal axial recess with a round punch. In Fig.4 shows a scheme of forming a round punch. In the same form 3 in a semi-circular rod 2 is formed into a longitudinal axial recess 5 by the punch 6 having the shape of a rod or cylinder. In forming the longitudinal recess of the punch 6 in the form of a round rod or cylinder crank. This leads to the improvement of the quality (smoothness) of the moldable surface is given the rubbing material, soaked hydroxyl-containing organic compound. As hydroxyl-containing organic compounds using methanol, ethanol, propanol, isopropanol, butanol, etc., as a cleaning material used cotton fabric, wool, etc., Wiping promotes removal from the surface of the inner part of the film hydroxide of alkaline, alkaline-earth metal or of an alloy based on it and the conversion of the surface layer in the alcoholate. The alcoholate at a time prevents the formation on the surface of the inner part of the film of oxide hydrate and protect the metal casing from corrosion from the inside. Then, the inner part 2 is placed in the metal shell 1 and seal it. As the metal shell used aluminum foil. For sealing use molten bitumen or water-resistant adhesives glue type 88, waterproof point and so on, Glue the ends of the foil and wrap the inner part of the aluminum foil.

An example of a specific implementation.

Prepare a sealed capsule in the form of a semicylinder. In the manufacture of the inner part of the sealed capsules from the amount of sodium cut the workpiece in the shape of a bar with uneven edges. Bryology rod with a diameter of 58 mm and a length of 400 mm Pressing is carried out by pressing, gradually upsetting detail by 0.2-0.5 mm Punch in the form of a round rod with a diameter of 14 mm and a length of 500 mm is formed by pressing the longitudinal axial recess 7 mm half-round rod. In forming the longitudinal axial recess punch in the form of a round rod or cylinder crank clockwise and counterclockwise the number of turns 4-6 minutes Molded so the inner part of the sealed capsule is extracted from the mold and wipe it with cotton wool moistened with ethanol. Then, the inner portion is wrapped in aluminum foil. For sealing use molten bitumen. Glue the ends of the foil molten bitumen.

The proposed method is simpler than the method on the prototype. High quality sealed capsules is determined by the absence of corrosion of the aluminum shell on the inside.

The application of the proposed method will improve the manufacturability and reliability of the sealing of the capsule.

Claims

A method of manufacturing a sealed capsule that includes the location of workpieces from alkaline, alkaline-earth metal or alloy-based form, forming with the situation of the metal shell, characterized in that the prepared sealed capsule in the form of a semicylinder with the inner part in the form of a circular rod with a longitudinal axial recess in the molding by pressing the inner part of the sealed capsule is formed into first semicircular rod, and then punch in the form of a round rod or cylinder is formed into a longitudinal axial semi-circular recess in the rod, in forming longitudinal recesses punch in the form of a round rod or cylinder crank, and before being placed in the metal shell, the inner part of the sealed capsule wipe cleaning cloths moistened with hydroxyl-containing organic compound.

 

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