A device for washing the tubing of oil and gas wells

 

(57) Abstract:

The invention relates to the field of exploitation of oil and gas wells, complicated asphalt-resinous and palatinolinotype sediments. The device includes a container and a pump mounted on self-propelled vehicle with accessory equipment and components, and the estuarine rebar tying wells. The composition of the peripheral equipment includes a lubricator with a built-in cork crane, Salnikov seal and a hollow rod, matched with Salnikov seal removable cover with possibility of vertical movement and fixation in the extreme positions. The upper tip of the rod has a stop valve and a connection node of the supply line from the pump. In the extreme upper position of the hollow rod its lower tip is located above the cork crane in the lubricator. In the lowest position of the lower tip is located below the centre of the valve. The lower tip has a nozzle for forming pressurewise stream flowing fluid with a pressure higher than linear. The device allows for the displacement of gas by the liquid after stopping the wells directly by filing a displacing agent through prices is, 1 Il.

The claimed technical solution relates to the field of oil and gas production, in particular to devices used for the elimination of asphalt-tar and paraffin-hydrate deposits (ARPD) in wells.

The use of organic solvents for the prevention and removal of asphalt-resin-paraffin deposits known in industrial practice field [1] and has been widely spread. In accordance with [2] the injection of the solvent is carried out in the annulus and pumped to the complete elimination of paraphysomonas deposits at the end of the pumping volume of the solvent with the purpose of its economy replaces the annular gaseous environment to a dynamic level of the well.

A device for dewaxing oil wells by treatment with hot oil, consisting of a heater and pump, mounted on self-propelled vehicle, characterized in that in order to be able to use as coolant oil flow line of the treated wells it is equipped with a separator installed at the inlet of the oil from the flow line bore in the heater the main drawback of the device is that option only direct washing of the wells, this leads to high costs of reagents due to the need to fill the annulus, the volume of which is 5-6 times greater than the volume of the tubing (tubing).

The purpose of the proposed technical solution is the reduction of costs and time for the dewaxing of wells.

This goal is achieved by the fact that in the device for washing the tubing of oil and gas wells, including the tank, pump, mounted on self-propelled vehicle with accessory equipment and components, and the estuarine rebar tying wells, according to the invention in the composition of the peripheral equipment includes a lubricator with a built-in cork crane, Salnikov seal and a hollow rod, matched with Salnikov seal removable cover with possibility of vertical movement and fixation in the extreme positions, the upper tip of the rod has a stop valve and a connection node of the supply line from the pump, in the extreme upper position of the hollow rod its lower tip is located above the cork crane in the lubricator, and in the lowest position of the lower tip is NOK flowing fluid pressure, greater than linear.

The essence of the proposed technical solution is that after you stop the borehole separation of fluids in the Central tube and the deposition of paraffins, as a rule, is in the zone occupied by the gas phase. The inventive device allows for the displacement of gas by the liquid after stopping well not through the annulus, and directly by filing a displacing agent through the Central pipe.

The drawing schematically illustrates the device.

The device consists of a lubricator 3 plug valve 4 and cover with Salnikov device 2, through the gland skipped hollow rod 3 with the lugs 7, 9, connected with shut-off valve 12 and the pipe feeding the reagent from the pump 10. In the upper position of the hollow rod tip 9 is located inside the lubricator 3 above the level of the cork crane 4. In the lower extreme position of the hollow rod passes through the plug valve 4, the tee of the hole 5, the Central valve 6.

The device operates as follows. The lubricator 3 is mounted on the borehole by means of an adapter 11 after stopping work well when closed, the Central valve 6 and line 8. Cap is brichter. Shut-off valve 12 in the closed position. The Central valve 6 comes off hollow rod 1 is translated at the cork open the valve 4 in the lowest position. To shut-off valve 12 in the closed position connects the supply line of the reagent from the pump. Offer linear valve 8, the shutoff valve 12, and turns on the pump reagent. Reagent displaces the gas through a linear gate valve 8 in line and fills the Central tube. After filling the Central tube reagent, aging or carrying out of any operations included the submerged pump and the displacement of the reaction products through the valve 8. Removable tip 9 has a cylindrical shape, the inner surface of which is treated with a purity of not less than 9. The inner diameter of the tip is selected on the basis of operating parameters of pump used.

If necessary, a repeat injection of the reagent. After processing is completed, the shutoff valve 12 is closed, the pipe feeding the reagent is detached, the hollow rod 1 is raised to its extreme upper position. Plug valve 4 is closed, the cover 2 with Salnikov seal and the rod turns away from the lubricator. The lubricator of demonti the ASS="ptx2">

The volume of reagents used for well treatment, is reduced by at least 5 times the cost of time - more than 2 times. It should be noted that using the inventive device provides opportunities for the expansion of methods of influence on aspg-fat:

more expensive and effective solvents due to a sharp decline;

thermochemical charges on the basis of the alkali metals, the use of which sometimes requires the completion of the reaction zone with water.

Sources of information

1. A. C. the USSR 1092164, 09 3 00 E 21 IN 43/00, 1984, BI. 18, 61.

2. A. C. the USSR 1234593, E 21 In 37/06, 1986, B. I. 20, 161.

3. A. C. the USSR 310031, E 21 In 43/00, B. I. 23, 1971.

1. A device for washing the tubing of oil and gas wells, including the tank, pump, mounted on self-propelled vehicle with accessory equipment and components, and the estuarine rebar tying wells, characterized in that the composition of the peripheral equipment includes a lubricator with a built-in cork crane, Salnikov seal and a hollow rod, matched with Salnikov seal removable cover with possibility of vertical movement and fixation in the extreme positions, Ukraine upper position of the hollow rod its lower tip is located above the cork crane in the lubricator, and in the lowest position of the lower tip is located below the centre of the valve.

2. The device under item 1, characterized in that the lower tip has a nozzle for forming pressurewise stream flowing fluid with a pressure higher than linear.

 

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