Method for underground tunnel reservoir building in rock salt bed having limited thickness

FIELD: transport and storage devices, particularly for building underground reservoirs.

SUBSTANCE: method involves placing adjusting pipe string bottom of directionally drilled well in horizontal position at well outlet; arranging preparation underground excavation for design tunnel reservoir height at initial stage of rock solution between casing and adjusting pipe strings of directionally drilled well; ejecting non-solvent in casing pipe strings along with maintaining non-solvent-brine interface in upper part of preparation excavation or in the case of stepped rock solving at level of each underground tunnel reservoir stage forming; maintaining non-solvent-brine interface in vertical well at level or above level of non-solvent-brine interface of preparation excavation.

EFFECT: increased efficiency of underground tunnel building.

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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 repositories for salt extraction through wells.

There is a method of construction of underground tunnel reservoir in the reservoir rock salt, which includes the drilling of directional wells with access to the horizontal position near the soles of the salt reservoir, installation of casing and technological pillars of the pipe, the flow of solvent and the extraction of the brine on the earth's surface on a suspended pipe columns (RF Patent No. 2213032, publ. 2003, IPC 7 65 G 5/00, E 21 7/06).

The disadvantage of this method is the high period of construction of the underground reservoir due to the limited consumption of the supplied solvent, due to the process of dissolution after one well.

Closest to the claimed technical solution is the method of construction of the underground tunnel reservoir in the reservoir rock salt limited capacity, providing for drilling vertical and directional wells with the release of directional well in a horizontal position near the soles of the salt reservoir, installation of borehole casing and technological pillars of the pipe to the location of the shoes breadboard is x columns of tubes at the base of the salt formation, the linkage of the wells on the salt layer, dissolution of rock by water flow through the process the string of pipe directional bore and selection of brine to process the string of pipe vertical wells (Vasaturo "Underground gazoneftekhimiya in deposits of rock salt". M., "Nedra", 1982, p.129-132).

This method allows you to shorten the construction of an underground reservoir by increasing the flow rate of the supplied solvent because water flow is directed by the well, and the selection of brine - vertical borehole. However, this method involves moving technological pipe string along the length of the horizontal section directional well that technically difficult. In addition, there is uneven development of production in height and unmanaged forming a tunnel underground reservoir, which can lead to the loss of its stability and cannot be used as a store.

Our problem is to increase the efficiency of construction of underground tunnel reservoir in rock salt at the expense management process with herstories.

In comparison with the prototype of the proposed solution has the following advantages:

- Provides managed forming an underground reservoir.

- Decrease the time needed to obtain the required brine, which can be transferred for disposal at russiapetroleum enterprise. This is due to the fact that underground tunnel reservoir processed immediately for the entire project length, the required area of sanyama is achieved in a shorter time.

The essence of the proposed method is to use the method of construction of the underground tunnel reservoir in the reservoir rock salt limited capacity, providing for drilling vertical and directional wells with the release of directional well in a horizontal position near the soles of the salt reservoir, installation of borehole casing and technological pillars of the pipe to the location of the shoes technological pillars of the pipes at the base of the salt formation, the linkage of the wells on the salt layer, dissolution of rock by water flow through the process column pipes directional well with a selection of brine to process the string of pipe vertical wells. According to the proposed method, the boot process the tubing directional wells installed at the outlet of this well in a horizontal position, at the initial stage of dissolution of rocks between the casing and shoes technological columns of tubes directional well create preparatory production on projektowaniu underground tunnel reservoir, in casing pipes both wells serves herstorical to maintain the boundary between herstorical-brine in the upper part of preparatory development, and at speed the dissolution of rocks in the roof of each stage of the formation of underground tunnel reservoir, the boundary herstorical-brine in a vertical well supported at the level or above the level of the boundary line herstorical-brine in the preparatory development.

In addition, as herstories use natural gas.

The location of Shoe technological columns at the end of the slope directional well allows you to create an underground tunnel reservoir without moving technological pipe string.

The creation of preparatory development between the casing and shoes technological columns of tubes directional well design the height of the underground tunnel of the tank at the initial stage of dissolution of rocks provides for the filing of herstories and the maintenance of specified boundary in the underground tunnel reservoir during its construction.

Submission of herstories in the casing pipe wells to maintain the boundary between herstorical-brine in the upper part of preparatory development, and at speed the dissolution of rocks to level the roof of each stage provides controlled the formation of the underground tunnel of the tank as the height, in the construction in one step, and along the length, at step forming an underground reservoir.

The maintenance of the boundary line herstorical-brine in a vertical borehole at or above the level of the boundary line herstorical-brine in the preparatory development achieves the desired height of the underground reservoir and allows to capture the moment of completion when herstorical of the underground tunnel of the tank connects to nerastvorim contained in a vertical well, or begins to flow in a vertical well.

The use of natural gas as herstories helps reduce the total cost of construction of an underground reservoir in comparison with the similar construction produced with the use of liquid herstories, for example diesel fuel, as well as to shorten the commissioning of an underground reservoir for subsequent storage in it's natural gas.

The proposed method of construction of the underground storage tanks in the rock salt is illustrated by the diagrams in figures 1-6.

Figure 1 presents the scheme of the method of construction of underground tunnel reservoir in the reservoir rock salt limited capacity in the process of breakthrough wells.

Figure 2 - the same at the end of the preparatory create in the processing.

The figure 3 presents the scheme of the method of construction of underground tunnel reservoir in the reservoir rock salt limited capacity at one stage of its dissolution in the initial period of formation of the tank.

Figure 4 - the same for the final period of the formation of underground tunnel of the tank when a single-stage dissolution of rock salt.

Figure 5 presents a diagram of the method of construction of underground tunnel reservoir in the reservoir rock salt limited capacity at the intermediate stage of dissolution of rocks at speed the dissolution of rock salt.

Figure 6 - the same for the final stage of dissolution of rock salt at step forming an underground tunnel of the tank.

The image in figure 1-6 include vertical 1 and 2 aimed wells that have the linkage on the sole of the salt layer 3 limited capacity. Vertical well 1 is equipped with a casing 4 and process 5 columns, pipes, and directional bore 2 of the casing 6 and 7 technological columns of tubes, this Shoe technological pipe string 7 is installed at the output of directional borehole 2 in the horizontal position. We construct an underground tunnel tank 8 (2-6) create through preparatory production 9 formed between the pads of the casing 6 and t is logical to 7 columns of pipe directional bore 2. Control of the formation of the underground tunnel of the tank 8 is realized by means of gaseous herstories, in particular natural gas, setting boundaries section herstorical - brine 10 and 11, respectively, in the preparatory development 9 in a vertical well 1.

The method is as follows. Initially producing drilling vertical 1 and 2 aimed wells in the salt layer 3 limited power output directional borehole 2 in a horizontal position near the soles of the salt layer 3 (figure 1). In a vertical well 1 is mounted casing 4 and process 5 the tubing and directional borehole 2 - casing 6 and 7 technological pipe string, this Shoe technological pipe string 7 set output directional borehole 2 in the horizontal position. If drilling operations 1 vertical and directional 2 wells were not connected, then carry out the works on the salt stratum 3 one of the known methods, for example by hydraulic fracturing of the salt layer 3 or dissolution of rocks in a vertical well 1 water supply for technological column pipe 5 and the selection of the brine on the casing pipe 4.

In accordance with the image 2 at the initial stage of construction of underground tunnel reservoir 8 create preparatory exp is processing 9 between the shoes of the casing 6 and 7 technological pillars pipe directional bore 2. For this process the string of pipe 7 serves water, and the resulting brine to be selected for casing pipes 6 directional borehole 2 and process the string of pipe 5 vertical wells 1. Preparatory production 9 create a design height of the underground tunnel of the tank 8 with the amount of dissolved salts raised on casing pipes 6 directional borehole 2.

At one stage the dissolution of rock salt, is shown in figure 3, 4, after the creation of preparatory development 9 in the casing pipe 4 and 6 vertical 1 and 2 aimed wells respectively serves gaseous herstorical (figure 3). The boundary herstorical-brine 10 with single-stage dissolution of rock salt shall establish and maintain in the upper part of preparatory development 9 design height formed underground tunnel of the tank 8, the boundary herstorical-brine 11 in a vertical borehole 1 is supported above or on the same level as in the preparatory development 9. In a production string of pipe 7 directional borehole 2 serves water, and the resulting brine to be selected for processing string of pipe 5 vertical wells 1 to the surface. After the roof of an underground tunnel tank 8 reaches the level of the interface Neretva Italy-brine 10 in the preparatory development 9, as shown in figure 4, there will be equalization of the border section herstorical - brine 10 and 11 or the level shift boundary line herstorical-brine 11 in a vertical well 1, which would indicate the completion of the construction of the underground tunnel of the tank 8. This technology provides a protective pillar of salt in the roof of an underground tunnel reservoir 8.

At step dissolution of the salt layer 3 limited capacity, which is shown in figure 5, 6, the volume of the underground tunnel of the tank 8 is conventionally divided by height in several stages. The boundary herstorical-brine 10 support in the preparatory development 9 at the level of the design elevation of the roof of each stage of dissolution of the salt layer 3 up until herstorical located in the preparatory development 9, reaches the vertical well 1 (figure 5). Then the boundary herstorical-brine 10 in the preparatory development 9 raised to the level of the next stage of dissolution, continuing the process of dissolution until then, until it reaches the design capacity of the underground tunnel of the tank 8 (6). Stepwise formation of the reservoir 8 requires more herstories, however, achieves a more uniform formation of its length.

The example used is for. During the construction of underground storage of natural gas underground tunnel reservoir 8 with a volume of 350 thousand m3invented in the depth interval 1150-1200 m salt layer 3 limited capacity. Originally Buryats vertical bore 1 to the bottom of the salt layer 3, it is set casing 4 and process 5 the pipe string. When the supply of water for technological column pipe 5 and the selection of the resulting brine to the casing 4 blur the production target of 5 thousand m3. After that are drilling a directional borehole 2 with output to the horizontal position near the soles of the salt layer 3 and the linkage with development-target vertical well 1. The length of horizontal section of a directional borehole 2 about 300 m In directional borehole 2 is mounted casing 6 and 7 technological pipe string, this Shoe technological pipe string 7 installed on the outlets of this well in a horizontal position near the soles of the salt layer 3. In a production string of pipe 7 directional borehole 2 apply water with a flow rate of 300 m3/h, and the resulting brine with a flow rate of 100 m3/h selected casing pipes 6 directional borehole 2, and process the string of pipe 5 vertical well 1 with a flow rate of about 200 m3/H. After the casing 6 with the brine will be removed about 2 thousand tons of salt, completed the formation of preparatory development 9 between the shoes of the casing 6 and 7 technological pillars pipe directional bore 2. In casing pipes 4 and 6 vertical 1 and 2 aimed wells respectively serves herstorical natural gas. The boundary herstorical-brine 10 is installed in the preparatory development 9 at elevation 1150 m and in the vertical bore 1 pair 1148 m In the construction of underground tunnel reservoir 8 water with a flow rate of 300 m3/h serves on the technological pillar of the pipes 7 directional borehole 2, and the brine is taken through the process column pipe 5 vertical wells 1. After the roof of an underground tunnel tank 8 reaches the boundary between herstorical-brine 10 in the preparatory development 9 produce the pumping of natural gas in the casing pipe 6 to isolate the increasing size of the roof of the underground tunnel of the tank 8 from the water. The construction of the reservoir 8 finish when herstories from his roof in a vertical bore 1, as evidenced by the level change of the boundary line herstorical-brine 11 in this well.

Thus creating the underground tunnel reservoir 8 preset forms and project sizes.

1. The method of construction of the underground tunnel R is servoir in the formation of rock salt limited capacity, providing drilling vertical and directional wells with the release of directional well in a horizontal position near the soles of the salt reservoir, installation of borehole casing and technological pillars of the pipe to the location of the shoes technological pillars of the pipes at the base of the salt formation, the linkage of the wells on the salt layer, dissolution of rock by water flow through the process column pipes directional well with a selection of brine on technological column pipes, vertical wells, characterized in that the Shoe technological pipe string directional wells installed at the outlet of this well in a horizontal position, at the initial stage of dissolution of rocks between the casing and shoes technological columns of tubes directional well create preparatory production the design height of the underground tunnel of the tank, the casing pipe wells serves herstorical to maintain the boundary between herstorical-brine in the upper part of preparatory development or stepwise dissolution of rocks at the roof level of each stage of the formation of underground tunnel of the tank, a vertical well the boundary herstorical-brine support level or above the level of the boundary line herstorical-brine in preparation is erabotka.

2. The method according to claim 1, characterized in that as herstories use natural gas.



 

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