Method for underground storage facility building in soluble rock

FIELD: construction of underground reservoirs in rock salt.

SUBSTANCE: method involves obtaining solvent by mixing brine with sweet water by supplying low-mineralized solvent from one reservoir under construction having the lesser volume of excavated cavity; solving rock along with maintaining predetermined flow rate of sweet water and conditioned (saturated) brine to be removed; discharging non-conditioned (low-mineralized) brine for following resaturation from above underground reservoir under construction having the lesser volume of excavated cavity; serially finishing construction of underground reservoirs of the group; constructing one or several following reservoirs of above storage facility and uniting the reservoirs with ones under construction.

EFFECT: increased efficiency of storage facility due to improved rationality of rock solution in reservoir group.

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The invention relates to the construction of underground reservoirs through wells in rock salt by dissolution and can be used in oil, gas and chemical industry for the creation of underground storage and extraction of salts through the hole.

There is a method to create underground through wells in soluble rocks, providing for the simultaneous creation of several openings of containers by injection of fresh water into one of the vessels under construction, rise to the surface brackish brine and inject it into other construction output capacity using brackish brine as solvent and obtaining saturated brine [Pemuda. Recolorable. - M.: Nedra, 1986, p.39-41].

The disadvantage of this method is that the concentration of solvent in that its use can reach 300 g/l of salt, which significantly slows down the process of dissolution of rocks in the subsequent openings of the containers and the cost of construction of underground repositories.

The closest is the way to create underground reservoirs in soluble rocks, providing for the simultaneous creation of a group workings capacities through boreholes by dissolving rocks using the mixed solvent and removal of nonconforming (slabomineralizovannogo) brine on Considine in other constructed underground tanks to maintain the level of concentration of substandard (brackish) brine, used as a solvent, by mixing streams substandard (brackish) brines of different concentration and flow rate [RF Patent №2063918, IPC 6 65 G 5/00, epubl,].

The disadvantage of this method is that the solvent when creating workings-tanks of the second stage is used, the brine produced during the construction workings-tanks of the first stage, the concentration of which can reach 300 g/l, which significantly reduces the rate of dissolution of rocks when creating workings-tanks of the second stage and leads to an increase in construction costs of underground tanks.

Our problem is to increase the efficiency of construction of underground storage in soluble rocks through wells by reducing the concentration of the mixed solvent and more rational management of the process of dissolution of solids in the group construction of underground tanks.

The solution of this task is achieved the following advantages of the proposed method:

- Ensuring the lowest concentration of sodium chloride in the solvent and the increase due to this the rate of dissolution of rocks.

- Substandard (brackish) brine as a solvent in the workings of the vessels with a developed inner surface, which allows more rational the material to carry out the process of the construction of underground tanks with a maximum flow rate of the solvent.

- Minimize the consumption of fresh water to prevent the dumping of substandard (brackish) brine in the subsurface.

The solution of the stated problem is achieved by using the method of construction of an underground repository in soluble rocks, providing for the simultaneous creation of a group of underground workings capacities through boreholes by dissolving rocks using the mixed solvent and removal of the resulting substandard (brackish) brine on his Considine in other construction underground storage tanks. According to the proposed method the solvent obtained by mixing the brine with fresh water, the process of dissolution of rocks are maintaining a predetermined water flow and remove conditional (saturated) and brine, removal of nonconforming (brackish) brine on Considine produced from the construction of underground tank group with the lowest amount of output, capacity, completion of underground storage tanks perform consistently, while at the end of the construction of one of the underground tanks of the group proceed to the construction of one or more of the following underground storage tanks with simultaneous introduction into the construction.

The use of solvent, developed the CSOs mixing of the brine with fresh water, increases the rate of dissolution of rocks and simultaneously promotes the full achievement of the project form an underground reservoir in comparison with the dissolution of rocks saturated with a solvent.

Maintenance of specified expenses of the water and sent for recycling conforming brine reduces the total period of construction of an underground repository by providing the maximum possible flow rate of the solvent and the required supply volume of brine russiapetroleum the company.

Removal of nonconforming (brackish) brine on his Considine of the construction of an underground reservoir group, in the course of construction, which received the lowest amount of output, capacity, contributes to the most efficient management of the process of dissolution of rocks while also creating a group workings tanks underground tanks.

Consistent completion of underground storage tanks while construction group workings tanks underground tanks allows within this group to form underground reservoirs large enough volume with different expiration dates of their construction and to dissolution of rocks with maintaining constant performance brine sent for recycling, and the flow of solvent that is substantially the forgiving process management facilities underground storage in General.

The implementation of the start of construction of one or several regular underground storage tanks at the completion of the construction of one of the underground tanks of the group under construction with simultaneous construction starts next underground tanks in the mode of dissolution of rocks for this group maintains a constant total consumption of fresh water and to a certain extent optimizes its use.

The proposed method of construction of an underground repository in soluble rocks is illustrated by the scheme shown in figure 1 and 2.

Figure 1 shows a fragment of the General scheme of construction of underground storage presented in the form of groups of three simultaneously constructed workings tanks underground storage tanks.

Figure 2 shows a fragment of the General scheme of construction of underground storage presented in the form of groups of three simultaneously constructed workings tanks underground storage tanks at the time of completion of one underground reservoir group and start construction next underground storage reservoir, enter in this group.

Image 1 and 2 include water supply 1 in ground pool 2, which get mixed solvent, line 3 supply of solvent and highway 4 selection of nonconforming brine, construction pozitsionirovany 5, 6, 7, 8 storage highway 9 for removal of conditional brine.

The method is as follows.

In the formation of rock salt drilling of wells through which at equal intervals produce simultaneous dissolution of rock to create the workings of tanks underground storage tanks 5, 6 and 7, forming a group consisting of three constructed underground storage tanks (Figure 1). In the initial period of formation of this group of fresh water from a natural spring on highway 1 serves in ground pool 2, then from line 3 are sent sequentially in a well created underground storage tanks 5, 6, 7 for conducting simultaneous dissolution of solids with the creation of the three openings of the containers. And from a production-capacity of the underground reservoir 7 with the lowest volume, low quality (brackish concentration of less than 170 g/l of sodium chloride) brine through line 4 return in ground pool 2 mixing with fresh water supplied through line 1. Thus obtained mixed solvent through line 3 is directed through the well into production-capacity underground storage tanks 5 and 6, where in the process of further dissolution of solids is Considine solvent. This forms a conforming (saturated) and brine, the concentration of which depends on the temperature of the other natural factors ranges from about 170 to 317 g/l of sodium chloride. This conditioning of the brine through line 9 is taken away for disposal rasolofosaon enterprise. Getting squared away the brine in the construction of underground reservoir 7, a portion of the brine away on highway 9 for recycling, and the remaining conditional brine return on highway 4 in ground pool 2. Thus maintain a constant total volume of conditioned brine sent for recycling, which reduces the consumption of solvent is directed through the wells into production-capacity underground storage tanks 5 and 6. Thus, while creating groups of three developments-the tanks underground storage tanks 5, 6, 7 support permanent water and selection of the required liquid.

Upon reaching the design capacity of the underground reservoir 5 building complete with a supply of solvent through line 3 and selecting the required brine through line 9 (Figure 2). At the same time start building the next regular underground reservoir 8 store, introducing him to the group construction of underground tanks 6 and 7. When this mixed solvent through line 3 serves in the hole through which the construction of a production-capacity of the underground reservoir 8, and substandard brine from this output capacitance is taken through line 4 and send in ground pool 2 for mixing it is fresh water. By this time, the volume of output-capacity underground storage tank 7 becomes sufficient to generate the required brine generated in the process of filing the mixed solvent. This conditioning of the brine is also taken through line 9 and sent for recycling rasolofosaon enterprises.

In addition to the construction of an underground reservoir 8 in group workings tanks underground tanks 6, 7 it is possible to simultaneously carry out the construction of several of the following underground storage tanks (not shown in figure 2), due to which the number of simultaneously constructed workings capacities of the specified group will be increased accordingly. While the total maximum number of co-constructed roadways-tanks in the group is determined by the total specified consumption of fresh water on the creation of underground storage in General.

When saving the three openings of containers in one group after you have completed the construction of an underground reservoir 6, again start to build the next underground storage reservoir (not shown in figure 2) using the simultaneous dissolution of solids in three wells constructed underground tanks. The same thing is produced on completion of underground storage tanks 7, 8 and so on, each time replacing them in the group constructed the creation of the m new ordinary workings of tanks underground storage tanks. Thus, constantly adding to the group simultaneously constructed of three or more openings of containers, producing each time the beginning of the new plant is the common mode of dissolution of solids in the group, carry out the sequential completion of each underground storage reservoir.

Example.

When creating underground storage of natural gas in three wells have been drilled in the thickness of rock salt are simultaneously building workings tanks underground tanks 5, 6 and 7 with a design volume of 300 thousand m3each. The period of construction of one of the underground tank is about 3 years. When you first begin the construction of an underground reservoir 5, then the facility continues in the mode of joint facilities with a production-capacity of the underground reservoir 6, and after some time they start building production-capacity underground storage tank 7. So form a group of three simultaneously constructed workings tanks underground storage tanks 5, 6, 7 store with different dates of commencement of their construction. The flow rate of the solvent supplied to each production-capacity group, is 100 m3/hour. This fresh water through line 1 with a flow rate of 200 m3per hour served in ground pool 2, which is also referred substandard (clomipramina the config) brine through line 4 of the output capacity of the underground reservoir 7 with the consumption, approximately 100 m3/H. With the change in the concentration of the resulting brine from 0 to 300 g/l concentration of the mixed solvent is from 0 to 100 g/l (on average 50 g/l). The mixed solvent is directed through line 3 in the construction of underground tanks 5, 6 and 7 with a total consumption of about 300 m3/h and with a flow rate of 100 m3per hour in each production-capacity underground storage tanks 5, 6, 7. Conforming (saturated) and brine workings of tanks underground tanks 5 and 6 through line 9 is directed to russiapetroleum enterprise with a total flow rate of 200 m3/hour. After the formation of conditioned brine part of his production-capacity underground storage tank 7 is selected and sent through line 9 for recycling, and the remaining brine through line 4 return in ground pool 2. As you increase the amount of underground reservoir 7 consumption taken from him and recyclable conforming brine increases from 0 to 100 m3per hour, the total flow rate of the solvent supplied into the developing tanks underground tanks 5 and 6, is reduced from 200 to 100 m3/h and correspondingly reduces the overall consumption taken from them and recyclable brine.

After the useful volume of the underground storage tank 5 reaches a value of 300 thousand m3feeding solvent into him stop and start creating materialized at ODI-capacity underground reservoir 8 with a simultaneous introduction of a group constructed underground tanks 6 and 7 (figure 2). When this mixed solvent through line 3 serves in production-capacity underground storage tanks 6, 7 and 8 of the group with the selection of the output capacity of the underground reservoir 8 substandard (brackish) brine, which is on highway 4 return in ground pool 2. This conditioning of the brine is withdrawn from the openings of the tanks underground tanks 6 and 7 and line 9 is sent to the consumer for recycling. Similarly alternately complete the construction of other underground tanks 6, 7, 8 group, carrying out each time the beginning of the construction of another new underground storage tanks, adding to their group at the same time constructed workings tanks with sequential completion of each projected underground storage reservoir.

The method of construction of an underground repository in soluble rocks, providing for the simultaneous creation of a group workings tanks underground tanks through boreholes by dissolving rocks using the mixed solvent and removal of the resulting substandard (brackish) brine on Considine in other construction underground storage tanks, characterized in that said solvent obtained by mixing the brine with fresh water, the process of dissolution of rocks are supp is a neigh-defined costs of fresh water and remove conditional (saturated) and brine, removal of nonconforming (brackish) brine on his Considine produced from the construction of underground tank group with the lowest amount of output, capacity, completion of underground storage tanks perform consistently, while at the end of the construction of one of the underground tanks of the group proceed to the construction of one or several of the following underground storage tanks with simultaneous introduction into the construction.



 

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