SU1263822A1 - Method of underground dissolving of salt deposits - Google Patents

Abstract

DISSOLUTION METHOD FOR UNDERGROUND salt deposit, vklyuchayupschy drilling, creating gidrovruba, nonsolvent -VOZdzpsa supply, creating the separating layer - between the air and oil brine, measuring the pressure in the product chamber on the well and the well center pole, feeding solvent and pumping the brine, characterized in that , in order to reduce costs and reduce the complexity of the underground dissolution of salt deposits, when creating a hydraulic pipe, oil products are used as a non-solvent, separating the layer between the air and brine is created after creating the hydraulic pipe by dispensing the oil products until zero pressure is established on the well head and using the oil products left in the well after they are released (L start-up, and air is supplied after the oil products are released.

Description

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The invention relates to the technology of underground salt dissolution and can be used in the extraction of brines through boreholes, as well as in the creation of underground oil and gas storages in salt deposits.

The known method (the Tramp method) involves pumping water and air into the lower part of the salt pool. At the same time, due to its limited solubility in brine, air is released from brine and water and accumulates at the roof of the chamber, forming an air cushion several centimeters thick, which prevents the roof of the chamber from dissolving.

The disadvantage of this method is the need to continuously monitor the state of the pad and frequent air supply to the well. This is due to the large air losses due to its high solubility in water and brines in the dissolution chamber. In addition, the method has high energy consumption for the operation of compressor equipment. .

The closest to the technical essence and the achieved result to the proposed is a method of underground salt dissolution, including drilling a well, creating a hydraulic pipe, supplying a non-solvent - air, creating a separation layer - oil between air and brine, measuring the pressure of products in the well and chamber. wellhead, solvent supply and brine pumping.

The disadvantages of this method are the large laboriousness due to the operations of metering, mixing, control and supply of petroleum products, air and bottoms of BZhS, the creation of preparatory workings of irregular shape due to the air supply from the very beginning of the development of salt deposits, a sufficiently large amount of oil products and VZhS and a large amount of equipment for monitoring, dosing and transportation of these products.

The known method can be implemented only with the presence of HWS in the area of the brine industry or at an acceptable distance from it, which significantly narrows the scope of its application,

When using oil as a non-solvent, after pumping the latter out of the chamber, part

oil remains in it, settling on the surface of the roof last, and forms a layer of several centimeters, closing the 1st roof, which can be used as a separating layer between the air-solvent and the brine in the chamber

The purpose of the invention is to reduce costs and reduce the complexity of the underground dissolution of salt deposits.

5 The goal is achieved by the fact that in the method of underground dissolution, including drilling a well, creating a hydraulic pipe, supplying a non-solvent — air, creating

0 separating layer - oil products between air and brine, measuring the pressure of products in the well and chamber at the well head, supplying solvent and pumping out brine,

5, when creating a hydrovrub, petroleum products are used as a non-solvent; a separating layer between air and brine is created after creating a hydrovrub by tapping oil products before establishing zero pressure on the wellhead and using petroleum products left in the well after their release, and air is supplied after the oil is released .

The method is carried out as follows.

Salt seam open wells; Noah. Well equip casing,

 water supply and brine-lifting columns. In the space between the casing and water-supplying columns, petroleum products, such as petroleum oils, kerosene are supplied, after which water is pumped into the well and brine is extracted to the surface. The process continues until the formation of a preparatory production of a hydrovrub of a given size. Then, pumping out of the production of petroleum products is started, while at the tip of the well they continuously monitor the pressure change in the nonsolvent column. The pumping process is stopped after

55 - achieve zero pressure. This indicates that a certain part of the oil products that were used as a non-solvent in the formation of a hydraulic pipe has been removed. On the surface of the roof there remains a layer of oil products several centimeters thick, sufficient for use as a separating layer between air and salt in the chamber. I then lift the technological columns to the height of the operational stage and begin to pump water into the well. At the same time, air is supplied to the column of non-solvent or simultaneously with water to the water supply column, which pushes aside the layer of oil products remaining in the chamber and occupies a position at the roof of the chamber, preventing the latter from dissolving. An insulating layer of petroleum products prevents the penetration of air from the air cushion at the roof into the brine, which reduces its losses and, consequently, reduces energy consumption for the operation of pumps. The cost of salt extraction by the proposed method is small due to the insignificant consumption of petroleum products. The process of dissolving the chamber is carried out until reaching the design dimensions. At the same time, oil products are not pumped using the remaining ones to maintain the separating layer during the entire operating period. The thickness of the layer in the process of scouring the chambers is reduced, however, it remains sufficient for the separation of air and brine. The need for additional pumping of petroleum products and the time of this operation can be established by calculation, taking into account the volume and area of the roof of the hydraulic pipe, the design volume and area of the chamber in salt water and the thickness of the non-solvent layer. Applying the method significantly reduces air loss when using the latter non-solvent by stabilizing the air layer near the roof of the chamber while at the same time minimizing oil products to create a separating layer. All this reduces the costs for the formation of chambers by 30-40%, simplifies the process.

Claims (1)

METHOD FOR UNDERGROUND SALT SALT DEPOSITS, including drilling a well, creating a hydraulic pipe, supplying a non-solvent-air, creating a separating layer of oil products between air and brine, measuring the pressure of the products in the well and the chamber on the well head, supplying solvent and pumping out the brine, characterized in that, in order to reduce costs and reduce the complexity of the underground dissolution of salt deposits, when creating a hydraulic pipe, oil products are used as a non-solvent, which separates the layer between air and scrap is created after the creation of a hydraulic pipe by releasing oil products until zero pressure is established on the well head and using oil products <g remaining in the well after they were launched, and air is supplied after the release of oil products. >