RU2069736C1 - Method for supply of reagents to oil-gas well - Google Patents

Abstract

FIELD: oil and gas production, particular, supply of reagents to oil-gas well in container. SUBSTANCE: run into well is container with reagent. Container has body with ports and plug, head with charge of explosive and unit for its blasting. Reagent is supplied to well in sectional container. Sections are hydraulically and mechanically connected to one another by connecting units. The latter have passage channels, load-bearing members and flexible material. Load-bearing members form separate hollows in connecting units. Flexible material, for instance, rubber, is placed in hollows. Hollows are made for producing in flexible material of acting opposite compression and tension stresses. EFFECT: higher efficiency of supply to well of any amount of reagents without wedging of container. 2 dwg

Description

 The invention relates to oil and gas production, and more particularly to a technique for supplying reagents (cement mortar, acid, surfactants), etc.) to an oil or gas well.

 These reagents are used to repair wells and isolate formations (cement mortar) or to stimulate the recovery of oil and gas formations (acids, surfactants, etc.).

A known method of supplying reagents to an oil and gas well under pressure, which consists in pumping them into the desired zone through the tubing lowered into the well by a pump located at the wellhead [1]
The specified method is reliable and widely used, however, it is very laborious due to the need to first lower the tubing into the well, and then remove them from there.

This drawback is eliminated in another known method of supplying reagents to an oil and gas well under pressure, adopted as a prototype [2]
This method of supplying reagents to an oil and gas well at a pressure of 6 greater than the hydrostatic pressure in the working interval of the well includes feeding the reagent into the well in a container containing a case with windows and a plug, a head with an explosive charge and an explosive assembly.

 In this method, the reagent is lowered into the well in a container on a geophysical cable, in the planned interval, a current pulse is fed through the cable to the head with an explosive charge, the explosive is blown up, which creates a pressure exceeding hydrostatic in the working area of the well, as a result of which the plug is removed into the well, and the reagent is poured under pressure, penetrating the perforation channels into the reservoir. After blasting, the geophysical cable is removed from the well by lifting the container to the surface for recharging. To perform the method, neither installation of pumps at the wellhead, nor installation, nor dismantling of tubing is required.

 However, the widespread use of the method is restrained by the fact that the container cannot be made longer than 3-4 m because of the possibility of jamming in curved sections of the well, and therefore the amount of reagent delivered is only 20-30 liters.

 The aim of the invention is to eliminate this drawback and increase the efficiency of the method of container delivery of reagent to the well by creating a method that allows you to deliver to the well any amount of reagent without jamming the container in the well. In addition, the creation of a new method will expand the list of reagents delivered to the well.

 This is achieved by the fact that in the known method of supplying reagents to an oil and gas well under pressure exceeding the hydrostatic pressure in the working interval of the well, including supplying reagent to the well in a container containing a case with windows and a plug, a head with an explosive charge and an explosive assembly, supply in the well of the reagent is carried out in a sectional container, sections of which are hydraulically and mechanically connected to each other by connecting nodes made with passage channels, power elements, conductive connecting nodes isolated in the cavity and an elastic material such as rubber, placed in the cavities, wherein the cavity is configured to receive in the elastic material of oppositely acting compression and tensile stresses.

 A positive effect in the proposed method is achieved due to the fact that the delivery of the reagent is carried out in a sectional container, allowing you to deliver any required amount of any reagent to the well.

 A sectional container allowing the implementation of the proposed method is shown in the drawing, where in FIG. 1 shows a sectional container, a longitudinal section; in FIG. 2 is an enlarged view of the connecting unit 1 of the container sections (in FIG. 1).

 The device contains reagent 1, cement mortar, acid, surfactant, etc., delivered to the well. housing 2 sections of the container; a window 3 in the body of the container section 2; plug 4 in window 3; plug 5; head 6 with a charge of explosive; explosive detonation unit 7; passage channel 8 of the connecting node; power elements 9 forming separate cavities in the connecting unit; elastic material 10, for example rubber, placed in cavities.

 The proposed method is as follows.

 The reagent 1 is poured into the container, placing it in the buildings 2 of the container sections by moving the reagent 1 from section to section through the passage channel 8. A plug 5, power elements 9 and elastic materials 10 ensure the tightness of the container. After that, the head 6 is mounted with the explosive charge and the node 7 for undermining this substance and then the container is lowered on the geophysical cable into the well. Since the container is flexible, it passes into the well at any curvature.

 After the container reaches the level planned by the technological process, a geophysical cable supplies electric current to the explosive detonation unit 7. An explosion of this substance raises the pressure that is transmitted to the reagent in all sections. The plug 4 is pressurized from the window 3, and the reagent is poured into the well, penetrating under pressure under pressure through the perforation channels.

 Then the container is removed, charged with reagent and explosives, and used in other wells.

 The proposed method allows you to deliver the required amount of reagent to the well in one run instead of 3-5 runs according to the known method.

Claims (1)

 A method of supplying reagents to an oil and gas well at a pressure exceeding the hydrostatic pressure in the working interval of the well, comprising supplying reagent to the well in a container containing a case with windows and a plug, a head with an explosive charge and a blast assembly, wherein the reagent is fed into the well carried out in a sectional container, the sections of which are hydraulically and mechanically connected to each other by connecting nodes made with passage channels, power elements forming in connect ln nodes separate cavities, and an elastic material, for example rubber, placed in the cavities, while the cavity is configured to receive opposing compressive and tensile stresses in the elastic material.

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