SU1633099A1 - Method of forming underground receptacle in rock salt deposits - Google Patents

Description

(21) 4365696/03

(22) 22,01.88

(46) 03/07/91. Pul R f |

(71) All-Union Scientific Research Institute, Institute of Gas Use in the National Economy, Underground Storage of Oil, Oil Products and Liquefied Gas

(72) V.P. Neupgkoev, P.M. Sonin, Yu.S. Vasyuta, L. G.Pozdnkov, I) .T.Fa- and V.Vologin

(53) 622.277 (088.8)

(56) Lreng V.; K. A well hole is more useful than minerals. - I., 1986,

with. 163.

Copyright certificate of the USSR K 1265293, cl. K 21 B 43/28, 1986.

(54) METHOD OF CREATING LODYYSH: CAPACITIES IN DEPOSITS OF KATSHOY SAL

(57) The invention relates to the creation of underground reservoirs in rock salt deposits for storing hydrocarbons. The goal is to increase the rate of capacity creation while reducing costs by reducing the flow of fresh water. The method is carried out as follows. During the production period, fresh water is supplied through the well into the tank. There is a dissolution of salt and the formation of brine (P). The concentration of P is determined and, at a concentration of 140-150 kg / m, P is withdrawn from the underground tank to the surface. At the same time, the extraction of salt from P with the separation of water is carried out by reverse osmosis in an osmotic installation. Saturated P is withdrawn through the pipeline for disposal or pumped through an absorption well into an absorptive formation. Fresh water is recycled through a pipeline to a process well. 2 Il.

(ABOUT

V

The invention relates to the field of creating underground reservoirs in sediments of rock salt for the storage of fragile materials.

The aim of the invention is to increase the speed of capacity creation and reduce costs for reducing the flow of fresh water.

Figure 1 is a diagram of an apparatus for carrying out the method; in fig. 2 - curves explaining the proposed method.

The device is a circuit for creating an underground tank 1.

in deposits of rock salt 2 by dissolving the salt with water. The scheme includes a technological well consisting of casing 3, external working column 4 and internal working column 5. Ground pipeline 6 creates a technological well and a brine well 7. Ground communications are equipped with control valves 8 and pumps 9. The flow chart includes pipeline 10 for feeding brine from the brine solder 7 to the osmotic installation 11, equipped with a semi-permeable pemb05

with with about x with

Wound 12. The scheme includes a pipeline 13 for withdrawing saturated brine from the osmotic unit 11 to the absorption well 14, drilled into subsurface formation 15. The feed pipe 16 and the pipeline 17 for draining fresh water to the process well are connected to the osmotic cell.

The method for producing an underground mine is as follows.

B underground tank 1 after the end of the preparatory period and the creation of the initial chamber, fresh water is supplied to the process well through the external working column 4 via pipeline 17. After contact with rock salt 2, the salt salt dissolves - the formation of brine. During the washout, the concentration of brine formed is determined. The resulting brine at a concentration of 140-150 kg / m is discharged to the day surface through the internal working column 5 via line 6 to the brine separator 7. After the sludge, the brine at a concentration of 140-150 kg / m is poured into the osmotic unit 11, where the received flow grew on a semipermeable membrane 12 (permeable to fresh water and impermeable to ion salts)., concentrated brine (saturated ifbin) - T12-314 kg / m and fresh water. Poured brine through line 13 is diverted for disposal or pumped through an absorption well 14 into an absorbent layer 15. Fresh (desalinated) water after membrane 12 is removed and recycled through line 17 into a process well. The pumping of the dissect and the fresh water during the creation of the underground reservoir is carried out by pumps 9, and the flow control - by the valves 8.

5, due to the recycling of fresh water, the process of creating the underground reservoir by the proposed method only feeds fresh water through pipes 16. The formation of reservoir I is carried out with non-solvent feed fed into the annular casing and outer working column 4.

Figure 2 shows the mane of the change in time of the concentration of brine withdrawn to the day surface at a sampling rate of 88-93 m / h in production.

0

five

0

five

Q

0

five

40

45

55

The process of creating an underground tank without reverse osmosis (by a known method) at a temperature of 293.15 K. As can be seen from figure 2, curve 1, the creation of a tank by a known method is carried out in the main period at a concentration of 300 kg / m. This is due to the fact that, by a known method, the selection of lower concentrations is not economically feasible due to the need to inject large volumes of diluted brines into the absorbing reservoir.

The decisive parameter of the mass transfer process in the tank during its formation is the coefficient of dissolution of rock salt, kcp .. It depends on the nature of the solute, physical and chemical properties of the solvent, characterized by concentration pressure, average dynamic viscosity coefficient and temperature, speed of movement solvent, the height of the soluble salt surface and its angle of inclination to the vertical. Figure 2, curve 2, shows the experimental values of the rate of dissolution of rock salt at different brine concentrations. From a comparison of curves 1 and 2, it can be seen that the course of dependences 1 and 2 is antibath. And in the course of washing the reservoir by dissolving the salt, according to a known method, a sharp decrease in the rate of dissolution of the salt occurs, and consequently, a decrease in the rate of creation of the underground reservoir.

According to the proposed method, the maximum concentration of brine in the tank during the washout period (main period) is 150 kg / m3 - curve 3, FIG. 2. Curve 4, Fig. 2, describes the salt dissolution rate (experimental dissolution rate coefficient) at a concentration of 150 kg / m5 of brine discharged to the day surface. Comparison of curves 4 and 2 shows that maintaining the brine concentration in the tank of 150 kg / m leads to a sharp increase (1.7 times) in the rate of dissolution of the coke, and consequently, to accelerate the time required for the creation of an underground tank in comparison with the known method.

At the same time, from the very beginning of the creation of an underground reservoir for disposal, according to the proposed method, highly concentrated and purified brine with a concentration of 312-314 kg / mea is discharged. In this case, the yield of fresh water by the brine supplied for desalination is 50-95%. During the sreddanie underground reservoir erosion lead recirculation of fresh water and its partial feed.

Claims (1)

Claims of the invention: A method of creating an underground tank in sediments of rock salt, including the supply of fresh water during the operational period through the well into the tank and removal of brine one + Phyz, 1 1633099 0 extracting salt from brine with water separation and recirculation of separated water into the tank, differing from the tank to the day surface, in order to increase the capacity of the tank while reducing costs by reducing the flow of fresh water, the removal of brine from the underground containers on the day surface are carried out at a concentration of 140-150 kg / m3, while the salt is extracted from the brine with water separation produced by reverse osmosis. Ksr36-yu / s YUG 500 C, kg1n MO -400 350 - 300 250 -200 150 V yo 50 1000 2000 3000 T, h FIG. 2