Method of creating underground storage in soluble rocks

FIELD: construction of underground reservoirs in rock salt.

SUBSTANCE: according to proposed method, hydrodynamic coupling is formed between casing tube strings to force gaseous nonsolvent from one well into the other. Solvent is delivered along suspended strings of tubes of first well, and brine is taken out along suspended strings of tubes of second well until gas pressure is built on head of first well required for setting gas -brine interface to new stage of rock dissolution, and maintaining of preset thickness of insulating layer of gaseous nonsolvent in top of dissolution stage in process of formation of first underground reservoir of ground is carried out at corresponding pressure rise on head of second well obtained by control of delivery of solvent and taking out of brine.

EFFECT: reduced consumption of gas at building underground reservoirs.

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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 to create underground through wells in soluble rocks, including drilling wells, installing them in the casing and hanging columns of tubes, the dissolution of rocks with the formation of the group consisting of at least two underground tanks, supply of solvent and selection of the resulting brine on a suspended pipe columns (RF Patent No. 2063918, IPC 7 65 G 5/00, published. 1996).

The disadvantage of this method is that it does not provide management process herstories, which complicates the formation of underground storage tanks specified form.

Closest to the claimed technical solution is the way to create underground through wells in soluble rocks, including drilling wells, installing them in the casing and hanging columns of tubes, the dissolution of the rocks forming the group consisting at least of two hydrodynamically connected underground tanks by stepwise dissolution of solids feed solvent and selection of the resulting RA is Sola on a suspended pipe columns with cyclic injection and sampling gaseous herstories (RF Patent No. 2055007, IPC 7 65 G 5/00, published. 1996).

This method, though, and involves the use of gaseous herstories at step formation of underground storage tanks, but there is no control of the process of injection and displacement herstories in the process of transition to each new stage of dissolution of solids in the formation of a group of underground storage tanks, resulting in losses of natural gas and cost of construction.

Our problem is to increase the effectiveness of the group underground reservoirs in rock salt through hole by means of the most complete control of the formation process of the underground tanks.

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

• Reduces the total gas flow to create an underground reservoir.

• reduces construction time due to the combination of the selection process, gaseous herstories with the flow of solvent into the underground tank.

• allows pumping of gaseous herstories one created underground tanks, which reduces gas loss during construction.

The essence of the proposed method is to use the method to create underground through wells in soluble rocks, on the expectation drilling, install them in the casing and hanging columns of pipes, the formation of a group consisting at least of two hydrodynamically connected underground tanks by stepwise dissolution of solids feed solvent and selection of the resulting brine on a suspended pipe columns with cyclic injection and sampling gaseous herstories. Thus, according to the proposed method, the implementation of hydrodynamic connection is produced between the casing strings of pipe wells, the flow of solvent is carried out by hanging columns of tubes of the first well and the selection of brine - hanging columns of tubes of the second well before reaching the end of the first bore of the magnitude of the gas pressure required to determine, in its boundary gas-brine to a new stage of dissolution of solids, maintaining the desired thickness of the insulating layer of gaseous herstories in the roofing stage of dissolution in the formation of the first underground reservoir is produced with a corresponding increase in gas pressure at the tip of the second well which is achieved through regulation of the supply of solvent and selection brine.

The creation of a hydraulic connection between casing strings pipes two wells in the transition to a new stage of dissolution of rocks allows you to reuse the gaseous herstorical, which usually is when it was released into the atmosphere or burned.

The flow of solvent on a suspended pipe columns of the first well and the selection of the brine on a suspended pipe columns of the second well before reaching the end of the first bore gas pressure at which it is establishing its boundary gas-brine at a new stage of dissolution makes it possible to intensify the process of selection of a gaseous herstories from the first well and feeds it into the casing pipe of the second well.

Maintaining a predetermined thickness of the insulating layer of gaseous herstories in the roof level of the underground reservoir of one well by increasing the gas pressure on top of another well permits, as necessary, to return the pumped gas into the previous hole, thereby providing multiple use of gaseous herstories.

The proposed method for the creation of underground storage in soluble rocks is illustrated by the diagrams in figures 1, 2 and 3.

Figure 1 presents the scheme of the method of creating an underground repository in soluble rocks, consisting of two underground storage tanks, at the beginning of the transition to the second stage of dissolution in the process of forming the first storage reservoir.

Figure 2 - the same at the final stage of transition to the second stage of dissolution of solids in the process of forming the first underground reservoir XP the reservoir.

Figure 3 - the same after working two stages of dissolution in the formation of the first underground reservoir and the first stage of the second underground storage reservoir.

The images in figures 1, 2 and 3 include the well 1 is equipped with a casing tube 2, the outer 3 and the Central 4 outboard columns of tubes. Through the end 5 of the bore 1 is supplied with solvent in an external 3 internal and 4 of the suspended pipe string. In the process of working out the speed of dissolution of rocks set the boundary gas-brine 6 in the roof of each level of the underground reservoir 7. Casing pipe 2 wells 1 through ground line 8 is connected with casing pipe 9 well 10. The outer 11 and inner 12 suspended pipe string bore 10 is connected to the cap 13. The interface of the gas-brine 14 is installed in the roof working speed underground reservoir 15 that is generated through the borehole 10. The solvent from the pumping station on the pipeline 16 is applied to the end walls 5 and 13 wells 1 and 10, respectively, and the brine from these wells is pressed into the ground recolored 17. Gaseous herstorical served in the casing tube 2 and 9 wells 1 and 10 from the compressor through the pipeline 18.

The method is as follows. As shown in figure 1, drilled in the thickness of the rocks of the borehole 1 equip casing colon the second pipe 2, it sets the outer 3 and the Central 4 suspended pipe string. From the pump through the top 5 in the outer hanging the string of pipe 3 serves the solvent, and the Central outboard column pipe 4 through the head 5, the brine to displace the surface. The interface of the gas-brine 6 support the roof of the stage of dissolution of the rock by paging gaseous herstories to cover the roof and produce washing steps up to its design capacity.

After testing the same degree of dissolution of rocks to create an underground reservoir 7 the interface gas-brine 6 well 1 was raised to the level of the next stage of dissolution of rocks (figure 2). To do this, create a hydraulic connection between casing strings pipes 2 and 9 wells 1 and 10, opening the valve of the pipeline 8. On top 5 wells 1 open the valve of the pipe 16 for supplying solvent suspended in the column of pipes 3 and 4, and the valve for discharge of brine in rasoolabad 17 closed. The well 10, on the contrary, close the valve on the cap 13 for supplying the solvent from the pipe 16 in the suspended pipe string 11 and 12 and open the valve on the discharge of brine in rasoolabad 17. When applying solvent into the well 1, the pressure in the underground reservoir 7 increases and gaseous herstorical on the casing pipe 2 and the pipe 8 is pressed into the casing is Olonne pipe 9 well 10.

The displacement of gaseous herstories from well 1 to produce until the boundary gas-brine 6 is set at the level of the next stage of the formation of underground tank 7 (figure 2). The gas pressure (P) on top of the well 1 is at a new stage of dissolution is determined by calculation according to the formula:

Pgas=PRast-RHYDR+Harticle·γRast,

where Rgas- the gas pressure at the well head of the well 1;

PRast- pressure of the solvent at the top of the well 1;

Harticledistance from tip 5 wells 1 to level a new stage of dissolution of rocks;

γRastthe density of the solvent supplied into the well.

PHYDRhydraulic losses during the movement of the solvent on a suspended columns with a flow rate Q and the path length of the Narticle.

Upon reaching the calculated gas pressure at the tip 5 wells 1 to enter a further construction of underground tanks 7 and 15 through wells 1 and 10, respectively. The top 5 well 1 block valve for supplying the solvent from the pipe 16 in the Central outboard column pipes 4 and open valve on the discharge of brine in rasoolabad 17 of the Central suspended pipe string 4. On the tip 13 of the bore 10 opens the valve for supplying the solvent from the pipelines is and 16 in the outer hanging a string of pipe 11 and close the gate valve on the discharge of brine in rasoolabad 17 from the external suspended pipe string 11.

To maintain a predetermined thickness of the insulating layer of gaseous herstories in the roof level of the underground reservoir 7 wells 1, increasing the area of the roof stage in the process of dissolution of rocks that make the return gas herstories from an underground reservoir 15 10 wells into the underground tank 7 wells 1. This increases the pressure in the underground reservoir 15 wells 10, increasing the flow of solvent from the pipe 16 to the tip 13 of the well 10 or reducing the selection of the brine from the suspended pipe string 12 in rasoolabad 17 through valves on the tip 13 of the well 10. When the gas from the casing pipe 9 through the pipe 8 enters the casing pipe 2 wells 1.

An example of using the method. When creating underground storage of natural gas simultaneously construct two underground tank 7 and 15 volume of 100 thousand m3each depth interval 1173-1214 m as herstories use natural gas. Construction lead to a 5-speed manual. The level of the boundary between the gas-brine 6 and 14 supported above the Shoe external outboard columns 3 and 11.

First construct the first stage of underground storage tanks 7 and 15 with the installation of external outboard columns 3 and 11 at the level of 1206 m and an internal hanging columns of tubes 4 and 12 level 1214 m Boundary gas-brine 6 and 14 support to mark the e 1205 m

After testing the first level of the underground reservoir 7 wells 1 create a hydrodynamic connection between casing strings pipes 2 and 9 wells 1 and 10 by opening the valves on the pipeline 8. From the pumping station the solvent through the pipeline 16 serves only in well 1 through the cap 5 in the inner 4 and outer 3 suspended pipe string, while the valve on the discharge of brine in rasoolabad 17 on the cap 5 is closed. On the tip 13 of the bore 10 opens the valve to discharge brine into recolored 17 and close the valve on the flow of solvent from the pipe 16 in the outer hanging a string of pipe 11. Thus increase the pressure in the underground reservoir 7 and reduce the pressure in the underground reservoir 15, and natural gas from an underground reservoir 7 and the casing pipe 2 displace the pipe 8 in casing pipes 9 and underground tank 15. The displacement of natural gas to produce until the gas pressure at the well head 5 does not decrease to a value of 1789 MVS This calculated value obtained in the following way:

The pressure on the gas in the top 5 at the position of the boundary between the gas-brine 6-level 1189 m is:

R=RRast-RHYDR+H· γRast=800-200+1189· 1=1789 MVS,

where RRast=800 MWS - pressure solvent on top 5 wells 1 manometer;

Harticle=1189 m - RAS is a being from tip 5 wells 1 to the border of the roof of a new stage;

γRast=1 is the density of the solvent supplied into the borehole 1;

PHYDR=200 MVS - calculation of hydraulic losses during the movement of the solvent on a suspended columns with a flow rate of Q=180 m3/h and when the path length Harticle=1189 m

The initial gas pressure at the tip 5 of the bore 1 in the transition to a new stage will be:

R=RRast-RHYDR+H· γRast=800-200+1205· 1=1805 MVS

The gas pressure at the tip 13 of the well 10 respectively will be

Pgas=Narticle·γRast+PHYDR=1205· 1,2+200=1646 MVS

Thus, the pressure difference on the top 5 in the casing tube 2 and the cap 13 in the casing pipe 9 (1805-1646=159 MVS) provides pumping gas from the well 1 into the borehole 10. By reducing the gas pressure to 1789 MVS stop the process of pumping gas from well 1 to well # 10.

Then resume the process of creating underground storage tanks 7 and 15 in the above sequence, moving from lower levels to dissolution in the underground tanks to the top of the steps to achieve the project volume of these tanks.

Excess gas as the roof in an underground reservoir 7 is pumped from an underground tank 15 through the pipe 8 into the casing pipe 2 wells 1. At the same density displacement R is sole the gas pressure at the tip 13 of the well 10 19 MVS higher than in the top 5 wells 1, so the gas will flow into the well 1. To increase the gas flow rate is taken from an underground reservoir 15 wells 10, close the gate valve on the discharge of brine in rasoolabad 17 wells 10. This increases the pressure of the brine in the underground tank 15 and the gas pressure at the well head 13, which increases the gas flow to be pumped into the well 1.

How to create underground in soluble rocks, including drilling wells, installing them in the casing and hanging columns of pipes, the formation of the group consisting of at least two hydrodynamically connected with an underground tanks by stepwise dissolution of solids feed solvent and selection of the resulting brine on a suspended pipe columns with cyclic injection and sampling gaseous herstories, characterized in that the implementation of hydrodynamic connection is produced between the casing strings of pipe wells, the supply of the solvent are carried out by hanging columns of tubes of the first well and the selection of brine - hanging columns of tubes of the second well to achievements on top the first well the magnitude of the gas pressure required to determine, in its boundary gas-brine to a new level of dissolved species, and maintain the desired thickness of the insulating layer hazoor the knowledge herstories in the roofing stage of dissolution in the formation of the first underground reservoir group is produced with a corresponding increase in gas pressure at the tip of the second well, achieved by regulating the supply of solvent and selection of the brine.



 

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