Method for underground reservoir building in rock salt

FIELD: liquid storage, particularly building underground reservoirs for liquid in soluble rock.

SUBSTANCE: method involves solving rock in several levels, wherein vertical preparation mine is preliminary formed before each layer solving. Natural gas is used as nonsolvent. Gas-brine interface is provided and maintained above top of level to be developed and natural gas is injected in vertical preparation mine. Then interface border is lowered to above top or below it. After level development the interface is increased and maintained above top of next upper level to be developed. All above operations are repeated at the next level.

EFFECT: reduced time of reservoir building and increased reliability.

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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 facilities and for the production of salt in the reservoir of limited capacity.

There is a method of creation and operation of underground gas storage in saline formations, including the drilling of wells, installation of casing it and hanging columns of tubes, dissolution of breeds feed solvent and selection of the resulting brine on a suspended pipe columns, and a stepped formation of the underground reservoir from the bottom up (Patent RF №2055007, IPC 6 65 G 5/00).

There is also known a method of construction of an underground reservoir in rock salt, which includes the drilling of wells, installation of casing it and hanging columns of tubes, dissolution of breeds feed solvent and selection of the resulting brine on a suspended pipe columns, and a stepped formation of the underground reservoir from the bottom up with the movement of external outboard columns before washing each stage (JV 34-106-98 "Underground storage of gas, oil and products of their processing", M., 1999, s-23).

The disadvantage of these methods is poor controllability of the formation of an underground reservoir by dissolving salt in stage associated with the inability to ensure that abulnaga the position of the boundary section herstorical-brine in the well when the pressure fluctuations of the solvent due to the small cross section of the well. In addition, the level section herstorical-brine is the Shoe external hanging the tubing that leads to the ingress of herstories this suspension column and lifting it to the surface, and ultimately - to the disruption of supply of solvent in the well.

Closest to the claimed technical solution is the way to create an underground reservoir in soluble rocks, including the drilling of wells, installation of casing it and hanging columns of tubes, dissolution of rock steps bottom-up flow of solvent and selection of the resulting brine hanging on the columns of the pipes, the formation of an underground reservoir with insulated roof production nerastvorim and displacement boundary line herstorical-brine at the transition from the lower level of dissolution of rocks to the top (JV 34-106-98 "Underground storage of gas, oil and products of their processing", M., 1999, s-23).

This way you can avoid herstories in external hanging a string of pipe, however, does not solve the problem of maintaining a stable level boundary line herstorical-brine in the formation of an underground reservoir.

The current task is to create an underground reservoir in rock salt through the borehole while enhancing the efficiency of extraction of salt.

The solution of this task is in charge of what are stated the following advantages of the proposed method:

- reduction of construction time, because it is easier to control the position of the boundary between herstorical-brine;

- improving the reliability of the formation of an underground reservoir by dissolving rock salt associated with a more stable position PetroChina underground tank at all stages of its formation, provided that the flow at the beginning of the testing stage full herstories needed to cover the roof of the tank.

The solution of the stated problem is achieved by using how to create an underground reservoir in rock salt, which includes the drilling of wells, installation of casing it and hanging columns of tubes, dissolution of rock steps bottom-up flow of solvent and selection of the resulting brine, formation of an underground reservoir with isolation of the roof framing by nerastvorim and displacement boundary line herstorical-brine at the transition from the lower level of dissolution of rocks to the top. According to the proposed method, when performing each step of dissolving rock salt pre-create vertical preparatory production, and as herstories use natural gas. When creating a vertical preparatory development stage of the interface gas-brine in the well establish and support is up above the roof level working level. In the generated vertical preparatory production stage pump natural gas and lower boundary of the gas-brine level or below the level of the roof the same level, after which further development steps lead by dissolving rock salt in a vertical preparatory development. At the end of the testing stage of the formation of an underground reservoir boundary of the section of the gas-brine raise again and installed above the roof level of the subsequent upper stage of dissolution of rock salt. Practicing this step is carried out in the same sequence of operations, which are listed for testing the previous stage.

The difference lies in the fact that part of the vertical displacement of preparatory development created above the roof level of the same level of formation of an underground reservoir, greater than or equal to the volume of natural gas injected into the well.

Another difference lies in that, when the lower boundary of the gas-brine in the generated vertical preparatory development with the establishment of this boundary under the roof of the stage to complete the testing stage pump additional gas-defined area of the roof for the stage.

The use of natural gas as herstories significant snige the cost of construction of an underground reservoir due to the low cost of this gas and reduce costs for its maintenance during the construction of an underground reservoir.

The formation of vertical preparatory development, part of the volume is created above the top level and more volume of natural gas in the well, provided the amplitude of the oscillations of the boundary between the gas-brine within 20 cm when stopping the supply of the solvent into the well, what is acceptable in the construction of underground repositories.

The formation of vertical preparatory development before working through each stage and the displacement of the boundary between the gas-brine within the specified limits in the process of testing the individual level and at the transition to level the upper level of the underground reservoir formation provide a stable position of the boundary between the gas-brine at the development stage and at the same time reduce the consumption of herstories, natural gas injected into the well to isolate the roof from unintended regulations construction dissolution of rock salt.

In addition, the establishment of the boundary between the gas-brine below the roof level stage before working out, and also calculated the amount of additionally injected gas provide a more stable position PetroChina underground reservoir by creating a thicker layer of herstories in the initial period of testing stage testing stage.

The proposed method of construction of an underground reservoir in the stone Sol is illustrated by the diagrams in figures 1-4.

The figure 1 presents the scheme of the method of construction of underground installations in rock salt when developing the first stage of its formation (option 1 - lower boundary of the gas-brine in the vertical preparatory development at the roof level of the first stage).

The figure 2 presents the scheme of the method of construction of underground installations in rock salt during the mining of the second (upper) stage of its formation (option 1 - lower boundary of the gas-brine in the vertical preparatory development at the roof level of the second stage).

The figure 3 shows a diagram of the method of construction of underground installations in rock salt when developing the first stage of its formation (option 2 - establishing a boundary between the gas-brine in the vertical preparatory development under the roof of the first stage).

The figure 4 shows a diagram of the method of construction of underground installations in rock salt during the mining of the second (upper) stage of its formation (option 2 - establishing a boundary between the gas-brine in the vertical preparatory development under the roof of the second stage).

Image 1-4 include casing 1 pipe of a well equipped with 2 external and Central 3 outboard columns of tubes. The flow of solvent 4 p is izvodyat external 2 hanging the string of pipe, and the selection of the brine 5 - Central 3 hanging the string of pipe. In the process of dissolution of rock salt first create vertical preparatory generation 6, which form an underground reservoir 7 develop the first 8 and second 9-speed dissolution of rock salt. Managing forming an underground reservoir 7 is performed by feeding or pumping gaseous herstories 10 with a change in the boundary between the gas-brine 11.

The method is performed in the following sequence.

As shown in figa and 1B drilled in rock salt wells will be equipped with casing pipe 1, in which the set of external 2 Central 3 suspended pipe string. This Shoe external 2 suspended pipe string is placed below the top level 8 of the first stage of dissolution of rock salt (figa). In casing pipe 1 serves herstorical - natural gas 10 under the pressure necessary to displace brine 5 and the boundary of the partition, the gas-brine 11 at 1-2 m above level 8 of the first stage of dissolution of rock salt (figa). For testing the first step in external hanging column 2 pipes serves solvent 4, and the Central 3 hanging the string of pipe remove the brine 5 on the day surface. This creates a vertical preparatory generation 6, the diameter of which is 4-5 meters

After the building vertical preparatory generation 6 (figa) at the first stage of formation of underground tank 7 again produce the injection of natural gas 10, and the interface of the gas-brine 11 is reduced to level 8 first stage (the roof of the first stage of creating an underground reservoir) dissolution of rock salt (figb) and support the interface of the gas-brine 11 at this level for periodic pumping of natural gas 10 to cover the roof this stage, thus conducting further dissolution of rock salt to achieve the design capacity of the first stage of the formation of underground tank 7 (pigv).

After the formation of the first level of the underground reservoir 7 (pigv) start creating the second stage, shown in figure 2. The interface of the gas-brine 11 raise in the borehole at 1-2 m above the level 9 of the second stage (Figo), giving further dissolution of rock salt, create a vertical preparatory production 6 second stage.

After creating the elaboration 6 at the second stage of the dissolution of the boundary gas-brine 11 is reduced by setting it on level 9 of the second stage (figb) and implement the dissolution of rock salt to the design scope of this stage of the formation of underground tank 7 (pigv).

Similarly create the subsequent stages of dissolution to complete the formation of the design capacity of the underground reservoir 7.

The outlet pressure of the brine 5 can vary from 0, when there is no injection Rast is orites 4, to 0.5 MPa, where the solvent co-injection 4 at the maximum flow rate. Fluctuations in the position of the boundary between the gas-brine 11 should not exceed the thickness of a layer of natural gas, equal to 5-10 cm, insulating the roof of an underground tank 7 at levels 8, 9 stages of dissolution.

When the amount of natural gas in the vertical preparatory generation 6 is equal to the volume of gas in the well, comprising 25-30 m3when the well depth of about 1000 m, the pressure attributable to the injected natural gas, 5%, and the change in total volume of gas (50-60 m3) is equal to 2.5-3.0 m3. Thus, fluctuations in the position of the boundary between the gas-brine 11 in the vertical preparatory formulation 6 with a diameter of 4 m is 5, see Here part of the vertical displacement of preparatory development 6 created above the roof level working level should be made equal to or slightly greater than the volume of natural gas in the well.

To facilitate the task of monitoring the thickness of a layer of natural gas 10, located on levels 8, 9 stages of dissolution when creating an underground reservoir 7 may be implemented in the second variant of the proposed method, illustrated in figure 3 and 4.

In accordance with a second embodiment of the process shown in figure 3 and 4, vertical preparatory myrabo the ku 6 at each stage of dissolution of rock salt to create the same as described above (figa, 4A). The difference between this version of the method is that at the completion of preparatory development stage of the interface gas-brine 11 set at the level (roof) (figb, 4B). To do this, perform an additional injection of natural gas 10 in the quantity necessary to fill them in on the part of the vertical displacement of preparatory development 6, which is above the level of the stage, and to isolate the roof level at the final stage of its return, i.e. the maximum area of the roof of this stage of dissolution. According to the scheme in figure 3, when forming the first stage of creating an underground reservoir 7 the interface gas-brine 11 set at level 8 of the first stage (roof) (figb). When the initial excess volume of natural gas 10 first lead mining project volume up to level 8 first stage underground reservoir 7 (pigv). The thickness of the layer of natural gas 10, insulating the roof level, at the end of its return will be reduced to the specified design thickness of 5-10 cm, which can further stabilize the position of the boundary between the gas-brine at the beginning of the testing stage. Similarly work out the second (pigv) and the subsequent step of forming an underground reservoir 7 (figure 4).

An example of the method.

The underground is nom store natural gas underground storage tank 7 by the amount of 100 thousand m 3constructed in the depth interval 1173-1214 M. the Construction is done in 5 steps. Pre through a hole drilled in rock salt, create a vertical preparatory production 6 with a diameter of 5 m depth interval 1206-1214 m this Shoe external outboard columns 2 pipes set at $ 1208 m, and the boundary of the gas-brine 11 supported at the level of 1206 m (figa). After creating vertical preparatory development 6 the specified threshold is lowered to the level of 1207 m (figb) and produce erosion of the first stage underground reservoir 7 in the depth interval 1207-1214 m to volume 13 thousand m3(pigv). After that, natural gas 10 is removed from the wells, and the Shoe external outboard columns 2 pipes set at the level 1198 m Then produce the injection of natural gas 10 in the casing 1 of the pipe to the level of 1196 m and create vertical preparatory production 6 in the depth interval 1196-1206 m (figa). After that, the interface gas-brine 11 is lowered to the level of 1197 (figb) m and dilute the second step the volume of 13.5 thousand m3underground tank 7 (pigv). At the next level of dissolution of the position of the boundary between the gas-brine 11 raise to the level of 1188 m and create vertical preparatory production 6 with a diameter of 4-5 m depth interval 1188-1196 m, then the interface of the gas-brine 11 is lowered to 1 m isostat third degree displacement of 12.5 m 3. At the fourth stage of dissolving the boundary gas-brine 11 raise to the level of 1180 m and create vertical preparatory production 6 with a diameter of 4-5 m depth interval 1180-1188 m After swap natural gas 10 and the lower boundary of the gas-brine 11 at 1 m work fourth stage volume 33.3 thousand m3. On the fifth and final stage of construction, the interface gas-brine 11 raise to the level of 1172 m, create vertical preparatory production 6 in the depth interval 1172-1180 m lower boundary of the gas-brine 11 at 1 m run fifth step volume 29 thousand m3. Thus, the total volume of underground tank 7 was 100 thousand m3. Fluctuations in the position of the boundary between the gas-brine 11 not exceed 5 cm, and the thickness of the layer of natural gas 10, insulating the roof of an underground tank 7 in the process of its construction amounted to 10 cm

This method allows to increase the reliability of the protection interval salt over working the stage from dissolution, which ensures strict observance of the rules of construction of an underground reservoir and ensures the achievement of a given size and geometric shape of the underground tank to ensure its stability during long-term operation.

1. The method of construction of an underground reservoir in rock salt, is with the drilling of a well, the installation in it of the casing and hanging columns of tubes, dissolution of rock steps bottom-up flow of solvent and selection of the resulting brine hanging on the columns of the pipes, the formation of an underground reservoir with insulated roof production nerastvorim and displacement boundary line herstorical-brine at the transition from the lower level of dissolution of rocks to the top, wherein when developing the next stage of dissolution of rocks pre-create vertical preparatory production, as herstories use natural gas, while the interface of the gas-brine establish and maintain above the roof level working level, in a horizontal preparatory production stage pump natural gas and reduce the position of the boundary between the gas-brine to or below the roof level of the same level, and after testing the specified threshold, raise again and installed above the roof level of the subsequent upper stage, the testing of which is carried out in the same sequence.

2. The method according to claim 1, characterized in that the part of the vertical displacement of preparatory development created above the roof level working level of soluble rocks, greater than or equal to the volume of natural gas injected into the well.

3. The method according to claim 1, characterized in that the at the lower boundary of the gas-brine in the vertical preparatory development with the establishment of this boundary under the roof of the working speed underground tank pumped additional volumes of natural gas-defined area of the roof in this step.



 

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