RU178977U1 - DEVICE FOR DELIVERY OF REAGENTS TO A WELL - Google Patents

Abstract

The proposal relates to the oil and gas industry and can be used to deliver chemical reagents to the required interval of the well. A device for delivering reagents to the well contains a choke with a plug located in the bottom of the choke, a sleeve that is located on the lower end of the chute to fix the stub, a tip with a head fixed on top of the bailer. The tip is made deaf, and the plug is made in the form of a check valve with a locking mechanism, the density of which is less than the density of the well fluid. The choke is capable of filling with a reagent with a density greater than the density of the well fluid to ensure that the reagent is replaced in the chunk below by the well fluid in several stages. The proposed design of a reusable device for delivering reagents to the well is simple and cheap. 1 ill.

Description

The proposal relates to the oil and gas industry and can be used to deliver chemicals to the required interval of the well.

It is known “Device for physico-chemical treatment of a well” (Patent RU No. 2588267, IPC ЕВВ 43/00, ЕВВ 36/00, Е21В 43/25, published on 06/27/2016 Bull. No. 18), including a heater-reactor body, inside of which the reactor zone is located, filled with thermally and chemically resistant filler, with electric heating elements placed along the entire length of the reactor zone, centering devices fixed at the inlet and outlet of the reactor zone, and thermal sensors located along the entire length of the reactor zone, the wires of which are insulated in the protective casing and inserted the heater-reactor housing together with power cables of the electric heating elements by means of the hermetic lead-in device, a filter and a plug located at the outlet of the reactor zone, as well as a mixer connected to the heater-reactor housing by means of a connecting element, equipped with an input for supplying technological substances and an input of a liquid reagent, moreover, electric heating the elements are made integral with the possibility of independent connection, the cap of the body is equipped with a check valve, as a mixer Use ejector, the ejector is provided with at least one liquid reactant inlet, equipped with a check valve on the reactor zone inlet in the housing-reactor heater between the connection element and the centering device is pressing mechanism.

The disadvantages of this device are the complexity of manufacturing, assembly and control during operation, the need for work when using electrical equipment and a specialist in working with this equipment, which together makes the operation of this equipment very expensive.

Also known is the "Method for the chemical treatment of oil and gas wells and a device for its implementation" (Patent RU No. 2288357, IPC ЕВВ 43/27, ЕВВ 43/263, published on November 27, 2006 Bull. No. 33) including a device for chemical processing of oil and gas well, containing a housing filled with a dry chemical reagent, a wireline cable for lowering the device into the well and a high explosive charge, while the body is made of silicate material with the ability to protect the chemical reagent from well pressure and temperature and instant destruction from a high explosive explosion charge.

The disadvantage of this device is the high cost of work due to the need to use explosives, which requires the involvement of specialists in working with explosives, while the “human factor” is very large when used, since if the measurement error is made, the reagent will be used before or after the required reset interval .

The closest is the "Device for the delivery of materials to the well" (Patent PM RU No. 60968, IPC ЕВВ 27/02, publ. 02/10/2007 Bull. No. 4), containing a chipper with a cover fixed by a flexible connection and located in the bottom of the chute, a sleeve which is located at the lower end of the choke, a sealing element, a tip with through holes, screwed onto the choke from above, rigid centralizers, and the chipper on the outside is equipped with a self-sealing cuff, which passes upwards and is rigidly fixed on the chipper with the lid in the chipper it is fixed from below using an antler grip connected to a sleeve that is screwed onto the bobbin, while the collet grip is made in the form of levers connected by a hinge between them, with the possibility of radial movement outward and release from fixing the lid in the working position, and the levers of the antler grip connected with a sleeve, made of spring steel, while the sealing element is mounted above the cover and is made in the form of a dish-shaped cuff.

The disadvantages of this device are the complexity of manufacturing and assembly due to the presence of a large number of precisely customized elements, which together makes the use of this device expensive.

The common disadvantages of all devices is that they are disposable, for each subsequent use they must be removed from the well.

The technical task of the alleged invention is the creation of a simple, cheap and reusable design of a device for the delivery of reagents to the well.

The technical problem is solved by a device for delivering reagents to the well, containing a choke with a plug located in the bottom of the choke, a sleeve that is located on the lower end of the choke to fix the stub, a tip with a head fixed on top of the choke.

What is new is that the tip is made deaf, and the plug is made in the form of a check valve with a locking mechanism, the density of which is less than the density of the well fluid, and the bobbin is made with the possibility of filling with a reagent with a density greater than the density of the well fluid to ensure that the reagent is replaced in the bunker from below by the borehole fluid in a few tricks.

The drawing shows a diagram of a device for the delivery of reagents to the well.

A device for delivering reagents to the well includes a choke 1 with a plug located in the bottom of the choke 1, in the form of a check valve 2 with a locking mechanism 3 (for example, a ball, gate, etc.), a sleeve 4 for fixing the check valve 2 , a blind tip 5 with a head 6, fixed on top of the chute 1. The density of the locking mechanism 3 is lower than the density of the well fluid and the density of the reagent (for example, a hydrocarbon solvent for diluting oil, an aqueous acid solution for dissolving salts, etc. can be used) zack Bailer 1 chennogo in more borehole fluid density for substitution reagent in Bailer 1 below wellbore fluid in several steps.

The device operates as follows.

The device is assembled and filled with reagent by means of the head 6 of the tip 5 is connected to the pipe string, rope, cable, swab bottom or the like. and lowered into the well (not shown) to the level of the wellbore fluid (not shown). In the borehole fluid, the locking mechanism 3 pops up and moves away from the seat of the check valve 2, opening the inside of the baffle 1 from below. When this reagent under the action of gravitational forces flows out of the choke 1, being replaced by a borehole fluid. When lifting the device, the locking mechanism 3 overlaps the seat of the check valve 2, excluding the spill of the reagent from the choke 1. If necessary, the reagent treatment process is repeated, lowering the device into the well fluid until the reagent 1 is completely replaced with the well fluid. After that, the device is removed from the well, the sleeve 4 from the choke 1 is unscrewed, disconnecting the check valve 2 to drain the well fluid. The sleeve 4 with a non-return valve is connected to the bailer 1. If further work is necessary, the tip 5 is disconnected from the bailer 1, it is filled with reagent on top, the tip 5 is mounted on the bailer, and the device is ready for operation.

Since the most dangerous processes (deposits on the walls of the borehole, high surface tension of the liquid in bituminous oil, etc.) take place at the liquid-air interface in the well (i.e., at the level of the borehole fluid), reagent delivery directly to this interval of the well gives the greatest the effect of exposure without inefficient reagent costs, and reusable use significantly reduces the cost of manufacturing and operating the device

The proposed design of a reusable device for delivering reagents to the well is simple and cheap.

Claims (1)

A device for delivering reagents to a well containing a bailer with a plug located in the bottom of the bailer, a sleeve that is located on the lower end of the bailer for fixing the plug, a tip with a head fixed on top of the plug, characterized in that the tip is made deaf and the plug is made in the form of a check valve with a locking mechanism, the density of which is less than the density of the borehole fluid, and the baffle is made with the possibility of filling with a reagent with a density greater than the density of the borehole fluid for ensuring the replacement of the reagent in the bottom of the borehole fluid in several stages.

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