SU889835A1 - Deep-well agent batcher - Google Patents

Description

(54) REAGENT WELLS

one

The invention relates to a technique for the extraction of oil, in particular, to devices for the dosed supply of liquid chemical products into the well to prevent corrosion, equipment and deposition of paraffin and salts.

Known depth metering devices, including the container and the cylinder connected to it with the porch, equipped with suction and discharge valves 1.

A disadvantage of the known devices is that they do not allow the use of chemical products that dissolve in the wellbore fluid or whose density is equal to or higher than the density of the wellbore fluid, since the chemical product in it is displaced only due to the difference in density.

Also known is a downhole reagent dispenser, which includes a container with two chambers communicated through channels with a well space, one of which houses the reagent control mechanism, and the second is filled with reagent and the piston 2 is located in it.

However, the known device does not allow for the periodic supply of the inhibitor, leads to its excessive consumption, premature cessation of the supply and necessitates the need for more frequent removal of the device to recharge it.

The purpose of the invention is to ensure the rational consumption of the reagent.

The goal is achieved by the fact that the chambers communicate with each other, the mechanism for regulating the supply of the reagent is made in the form of a gas-filled cylinder communicating with the mouth, and check valves are installed in the channels informing the chambers of the container with the well space.

The drawing schematically shows 5 downhole reagent dispenser, general view.

The dispenser consists of a container containing container pipes 1 and 2, interconnected by coupling 3, covered bottom by bottom 4 and top by cover 5. The container forms two chambers A and B communicating through channels 6 and 7 with the well space. In channels 6 and 7, check valves 8 and 9 are installed. In chamber A, a reagent nodule control mechanism is installed, made in the form of a cylinder 10 filled with gas, through a tube 11 with a valve 12. Chamber B is filled with a reagent, and a piston 13 is placed in it The coupling 3 has a channel 14 for communicating the chambers A and B. In the channel 6 there is a flow restrictor of a known construction, for example a fitting 15 with a calibrated orifice. A downhole reagent dispenser is installed in the well below the pump. It is connected to the pump with a cap 5 by means of a pipe, a shaft or a rope. Before descending into the well, chambers A and B are filled with reagent, and cylinder 10 through valve 12 is filled with compressed air or an inert gas. The gas pressure should be approximately equal to the lowest pressure of the well fluid at the depth of the installation of the metering device after the well is started up. The dispenser works as follows. When the well pressure increases in the well, the well fluid enters chamber B through non-return valve 9. At the same time, the piston 13 moves upward, part of the pearenfa from chamber B through channel 14 of clutch 3 enters chamber A, compressing the cylinder 10 with compressed gas. When the pressure in the well decreases, the compressed gas expands, increasing the volume of the cylinder 10 to its original state, and the corresponding amount of reagent is forced out of chamber B through the non-return valve 8, the hole 6 in the coupling 3 and the fitting 15. The piston 13 prevents the incoming into chamber B of the well fluid with a reagent. A temporary increase in pressure in the well is made from the ground by temporarily stopping the pump or pouring a portion of the product into the annulus. The amount of reagent displaced from the container tubes for each pressure change cycle is controlled by the magnitude of these changes. The greater the amplitude of the oscillation pressure, the greater. the volume of the reagent displaced. The duration of each dose is controlled by a flow limiter 15. The flow of reagent into the production of a well is controlled by analyzing product samples, by well flow rate, pressure changes at the wellhead and in the annulus. To simplify control, indicator substances can be added to the reagent, and control samples are installed on the discharge line.

Claims (2)

The use of this metering unit, providing control over the process of supplying the reagent from the surface of the earth, allows reducing the consumption of expensive reagents, simplifying the process of their use, increasing the efficiency of this process and increasing the turnaround time of the wells. The mechanism for regulating the supply of a reagent in the form of a cylinder ensures high reliability of the dispenser, since it has no movable compaction, is not sensitive to the presence of mechanical particles in the working medium, and withstands large excess gas pressures due to the fact that the container tube, lid and sleeve limit the deformation of the cylinder and perceive the pressure acting on it. The invention Borehole reagent dispenser, including a container with two chambers communicated through channels with a well space, one of which houses the reagent supply control mechanism, and the second is filled with reagent and contains a reservoir characterized in that in order to ensure rational consumption of reagent , the chambers communicate with each other, the mechanism for regulating the supply of the reagent is made in the form of a gas-filled cylinder communicating with the mouth, and in the channels informing the chambers of the container with the well space, check valves are installed. Sources of information taken into account during the examination 1. USSR author's certificate No. 649832, cl. E 21 B 43/00, 1976. 2. USSR author's certificate for application no. 2666032, cl. E21 B 43/00, 1978 (prototype). P