Method for making low-permeability screen in porous medium at underground gas storage

FIELD: oil and gas industry.

SUBSTANCE: invention refers to a method for making a low-permeability screen in porous medium at underground gas storage in porous reservoir beds and can be used in oil and gas producing industry. According to the invention, first, required volumes of solutions are determined in interwell spaces; the amount of 0.5-0.55 of design volume of spike solution and spike solution itself are pumped subsequently to injection wells till gases appear in a relief well; after that, design volumes of the solution and gas, which provide minimum required width of a screen, are pumped to the unloading well; waste gas of compressor stations is used as gas for creation of a screen. Nonflammable and/or inert gases are used as gases for creation of the screen.

EFFECT: increasing the screen continuity, reducing the flow rate of foaming agent solution and consumed energy for pumping-in and pumping-out, economy of natural gas and improvement of environmental situation in the underground gas storage location area.

3 cl, 6 tbl, 4 dwg

 

The invention relates to underground gas storage in porous reservoirs, in particular to methods restrict unwanted movement of fluids in porous media, and can be used in the oil and gas industry.

theoretical basis for the creation of the in-situ screens is the reduction of the relative permeability of the porous medium to the reservoir fluid and gas injection through wells in the area of the reservoir, subject isolation, screening of liquids of different nature - cement mortar, water-repellent agent, foams, emulsions, etc.

The most effective means for creating in-situ screens to isolate unwanted movement of the water and especially gas is the formation in a porous medium foam from the foam solution on the basis of surface-active substances (surfactants) and gas. According to the results of the laboratory studies described in the monograph (Operation of underground gas storages. Karimov F, M., Nedra, 1981), the foam formed in the layer of foam solution and gas, is a nonequilibrium disperse system and, depending on the surfactant concentration in solution and the gas saturation of the porous medium, can be several orders of magnitude lower permeability of the porous medium, especially for gas.

There is a method of creating e is wound by injection of foaming agents in the chain of wells in the area of the proposed gas leak in the reservoir (US No. 3393738, 1968 and US No. 3330352, 1967). According to this method in the mechanical mixing of the foaming solution and gas flow in the reservoir, subject isolation, in a porous medium foam which has insulating properties. The recommended concentration of surfactant in the foaming solution is from 0.001% to 10% of the mass. To improve the stability of the formed in the layer of foam in the foaming solution add the thickener. Thus the solution of the foaming agent is injected into the reservoir in an amount sufficient for the formation of a solid screen two portions, and the concentration of the surfactant in the first portion is from 1% to 10 wt. -%, and the second is from 0.001% to 1% of the mass. This way peculiar to the following disadvantages: when the injection of the foaming solution into all wells of the chain to obtain an acceptable result, you need to upload very large volumes of solution. The injection of the foaming agents in the chain of wells with a constant flow of leads to increase reservoir pressure. To maintain a constant flow rate it is necessary to increase the discharge pressure, which is not always feasible, and reducing consumption increases the time of the creation of the screen in the reservoir.

There is a method of creating a screen in the reservoir at which the foamable solution with a concentration of surfactant therein from 0.01% wt. up to 5 wt. -%, download magnetoelectronic, alternating with unloading (US No. 3379260, 1968 and US No. 3306354, 1967). When this relief well leave them open and pouring of liquids control the formation of a continuous barrier on the basis of the control of the surfactant concentration in the liquid.

Describes how to create a screen is more rational due to control excessive increase reservoir pressure and formation of a continuous barrier of foam solution due to the presence of discharge wells. However, due to the heterogeneity of the reservoir, the validity of creating a continuous barrier is lowered, and the flow of foam solution overstated.

There is a method of creating a foam screen (barrier) layer in underground gas storage (SU # 1385438, 1986). According to this invention, the foaming solution into the formation in the area of the proposed isolation of gas flow through alternating pressure and a relief well. In the first stage, the solution is pumped into a series of injection wells alternating with discharge, until the foaming solution selected from the discharging well fluid, and the discharge flow rate of the wells exceed the injection capacity. After introduction of the solution into the discharge wells injection wells stopped and transferred under sakacc the gas for pricing and the foam solution is injected into a relief well, and the volume of solution injected in the second stage, is 2/3 of the volume of solution injected into the reservoir at the first stage. Then in a relief well served gas for pricing.

The disadvantages of the method are as follows. The simulation shows that the volume of foam solution to create a screen depends substantially on the ratio of the flow rate of the discharge and injection wells, from the heterogeneity of the reservoir and the distance between wells. Since the discharge of the well, of which the first stage is selected liquid, produce a solution, uploaded, at least two adjacent injection wells, due to the heterogeneity and different, in the General case, the distance between the wells solutions from a nearby injection wells appear in the discharge wells not synchronously. A specified period of time ΔT is a significant amount. Calculations show that with the known error of shallow wells, such as 10 m, the solution at the rate of injection of 1000 m3/day appears in the discharging well on 3 days later, which would entail the adhesion of parts of the screen and the excess solution and surfactant at 3000 m3and 15 tons, respectively, only one well. In known SPO is both a factor not taken into account. In addition, the known method does not solve the issues of monitoring the reliability of the overlap of the insulated area, the spread of the screen outside at wells and does not determine the volume injected into gas wells to create a sustainable screen.

The prototype of the present invention is a method of creating a permeable screen in a porous medium with underground gas storage (the Russian Federation No. 2375281, 2008), which eliminated these drawbacks through the use of individual markers for injection of fluids into injection wells that are discharging wells identifies continuity of the distribution of the solution, which creates a screen between these wells, and limits the overhead of the solution (reagents, solvents and energy on it to download. After the second token into the discharge hole in her inject the solution in an amount which is sufficient to education in the formation of the isthmus, providing the minimum necessary width of the screen. The formation of a reliable deposition of the screen is achieved by injection into all wells of a chain of gas, equal in situ 3-5 volumes pumped into individual wells of a solution.

The disadvantage of this method consists in the following. In the prototype after the first marker is handling the hole in the first injection well start pumping gas, and after the second token of the discharge bore means in the discharge pressure and start the injection of the surfactant solution in the amount required for the formation of calculated values of the isthmus. Recent studies have shown that the consumption of materials and energy exceeds a multiple of the amount necessary and sufficient to create a screen.

As shown by experiments and computer studies, substitution of the solution of the foaming agent gas in a porous medium is almost reciprocating manner with the ratio of front-line saturation of 0.7-0.8 (figure 1). Recent experiments have shown that when the front gas saturation of 0.7-0.8 of one volume of solution foaming surfactants in situ formed 1.8-2.8 volume steady nonequilibrium deposition foam. Hence, out of the pumped volume of the solution between wells 1-2, 2-3 can be formed by further gas injection 1.8-2.8 volume steady nonequilibrium deposition of foam instead of a single volume, which is an inefficient spending of the solution energy for its pumping and pumping reservoir fluid and its disposal. Considering objectively the lack of accurate information about the reservoir, you can enter a factor of 1.1, increasing the minimum required amount of solution to improve the reliability of t is hnologie.

The tasks described invention is to improve the reliability of the active screen that is generated through a group of wells by injection of the solution and the gas, easing the creation of the deposition of the screen and the improvement of ecological situation in the area of UGS.

This object is achieved in that in the known method of creating a permeable screen in a porous medium under the underground storage of gas, including injection into injection wells foaming solution, the labeled individual markers, each of which corresponds to the injection well until foaming solution with a token corresponding to a given injection well, at least one discharge hole, the selection of the reservoir fluid from the discharge of the wells with a total flow rate, a large total flow rate injected into injection wells foaming solution, the injection of the foaming agents in the relief well after the occurrence of these solutions foam marker, relevant, at least two injection wells, according to the invention, pre-determine the required volumes of the solutions in the inter-well spaces, sequentially pumped into injection wells 0,5-0,55 estimated volume is EDINOGO foaming solution and labeled gas before the appearance of labeled gas into the discharge hole, then into the discharge bore pumping estimated volumes of solution and gas, providing the minimum necessary width of the screen, as a gas for creating a screen using the exhaust gas compressor stations, non-flammable and/or inert gases.

In addition, when there is no possibility to use these gases as a gas to create a screen used to be the storage of gas, which is somewhat costly creation screen.

A method of creating a permeable screen in a porous medium under the underground storage of gas is illustrated by drawings, where:

figure 1 - shows the dependence of the front gas saturation from the used foaming solution;

2 is a diagram illustrating non-synchronous flow of solution from the injection wells into the discharge;

figure 3 is a diagram illustrating a visualization of the solution of a system of equations for determining the amount of foam solution for filling interwell spaces;

4 is a diagram illustrating the final form of the deposition (solid) of the screen between the three wells; where positions 1, 2, 3 indicated wells: 1 and 3 - injection and 2 handling.

The proposed method is as follows.

To create a permeable screen produce drilling injection and discharge of SLE is Jin, for example, on the periphery of reservoir storage or lithological a "window"or synclinal mulde, or use the available wells in the isolated zone of the well.

Computer modeling to determine the volume V11foaming solution injected at the first stage in SLE. No. 1 to fill the interwell distance until loop tracer solution into the discharge hole No. 2.

In the same way that computer modeling to determine the volume V31solution required to fill the first stage interwell distances №3 and №2 to the calculated appearance of tracer solution into the discharge hole No. 2.

Prepare the estimated concentration of the foaming solution in the amount of 0,5-0,55 V11and mark it with a marker No. 1, and then is injected into the injection well No. 1 and connect the injection tracer gas (e.g., exhaust gas).

Prepare the estimated concentration of the foaming solution in the amount of 0,5-0,55 V31and mark it with a marker No. 3, is injected into the injection well No. 3 and connect the injection tracer gas (e.g., mixture of natural and waste or inert gas and exhaust gas).

In the case of a larger number of wells do likewise.

Since the creation of the screen is carried out through all of the wells, then DL the optimization process, the flow rate of a relief well must exceed the total flow injection wells.

After appearing in the discharge wells labeled gases from wells No. 1 and No. 3 discharge hole # 2 is translated injection foaming solution design volume V22providing the subsequent injection of gas, the formation of the isthmus, not less than the calculated width of the screen.

Thus, to create a screen between the wells there is no need to inject solution into the injection well until the token into the discharge hole, as indicated in the prototype (the Russian Federation No. 2375281, 2008), as it is a wasteful expenditure of solution energy on his pumping in and pumping out of the reservoir fluid and its disposal, and it is enough to inject into the injection well a solution of 0,5-0,55 of the volume of the generated screen, and then connect the injection well injection gas and wait for the advent of gas into the discharge hole.

For the organization guaranteed the continuity of the screen, the gas must be labeled in the sense that it should differ from hole to hole, through which the generated screen. After appearing in the discharge hole of the two markers gases injected into the injection well in a relief well starts pumping solution in the estimated extent that the subsequent injection of gas, the formation of the isthmus, not less than the calculated width of the screen. Volumes RA the solutions are determined by computer simulation.

Natural gas used to create the screen remains in the reservoir and practically cannot be extracted for use; moreover, the screen once every few years, and then erecycling, depending on the geological characteristics of the aquifer, reversed, because sorption and convective-diffusion phenomena is subject to destruction; therefore the replacement of expensive natural gas is economically relevant.

As a gas for foaming using the exhaust gases of the compressor stations of the UGS, non-flammable gases and inert gases.

Exhaust gases must be collected, cleaned in a standard way and served in a booster compressor, after which the usual way can be pumped by the same compressor in the wells involved in the creation screen.

Achievable economic result is the reduction of the cost of materials (surfactants, solvents, natural gas) and energy for pumping produced water and injection of the solution, increasing the reliability and efficiency of the deposition of the screen and improve the environmental situation of the area of UGS by recycling exhaust gases and reducing the volume of pumped highly mineralized formation water to be recycled. In the monograph [Karimov F Operation of Pozen the x gas storage, M., Nedra, 1981, p.41, table 3.3] shows that interest us information on a range of gas pumping units installed at compressor stations, underground gas storage (table 1).

Table 1
The quantity and temperature of exhaust gases of a gas engine, mounted on UGS
IndexGT-750-4GT-750-5GTK-5GT-750-6SCC-10GTK-6-750GHP-9-750STC-16
Number
exhaust gas, kg/s43,345,245,2548647,682110
Count the number of exhaust
gas, million3/day5,8a 3.9a 3.97,211,49to 9.9317,9724,192
Temperature
exhaust, °C260270270275268270270450

Theoretical and computational basis for creating a permeable screens are empirical dependence of relative permeability, which have the following form (Karimov F Operation of underground gas storages, Feet, Entrails the, 1981, str):

fW(s, C)=0, when: 0,8<C≤1;

fg(s, C)=0, at: 0<s≤0,1;

a=3,5+12 ln[1+(100C)1,5].

where:

s is the saturation of the porous medium, dimensionless quantity;

C - concentration of foaming surfactant wt. -%;

fW- relative permeability of the porous medium of the liquid, dimensionless quantity;

fg- relative permeability of the porous medium gas, dimensionless quantity.

As foaming agents use solutions of various surfactants. It is preferable to use solution synergistic surfactant compositions, consisting of a main foaming nonionic surfactants and auxiliary anionic surfactant in the formation water. For example, the composition consisting of the primary foaming nonionic surfactants in the form of an ethoxylated alkylphenol brand OP-7 or OP-10, or sodium salts karboksimetilirovaniya polyoxyethylene isofemale Sinterol AFM-12 and auxiliary anionic surfactant in the form of a sulfite-alcohol stillage (PRS) has a synergistic effect due to the high adsorption of the PRS on the surface of rocks (Hydrodynamics and filtering of single-phase and multiphase flows, proceedings of the GUBKIN state enterprise named after Gubkin, M., Nedra, 1972, p.76). When this occurs, the loss reduction OS is ESD surfactant to 60% of the mass. Preferably, the synergistic compositions using the above surfactant OP-10: PRS) in the ratio of from 0.6:1% of the mass. to 1:1, % mass. In the preparation of the solution is important is the use of produced water in the horizon, where it is planned to create the screen. This ensures maximum preservation of the strength and structure of the reservoir. The concentration of the synergistic composition of produced water is not less than 0.8%-1,0% of the mass.

To ensure sustainable of the screen width, the number of injected gas pricing in a relief well in situ is preferably from 2 to 4 volumes of the used amount of the foaming agent.

The concentration of surfactant in the foaming solution needed to create an effective screen, make with regard to the chemical composition of produced water, the sorption properties of the porous medium and surfactant (table 2).

The experimental values of the front gas saturation and value of the front gas saturation at the substitution in porous medium of surfactant solutions gas, calculated using formulas (1) and (2), shown in figure 1, where the adopted notation: M=1% - substitution of gas solutions of surfactants in the formation water hydrocarbonate-sodium type with a salinity of 1% wt.; M=15% replacement gas solutions of surfactants in the formation water potassium chloride type with the minelayer is essential 15% of the mass.

Table 2
A number of preferred applicability of surfactants to create screens depending on the salinity of the reservoir water
Replacement gas surfactant solution into the formation water hydrocarbonate sodium mineralization M=0,1%The critical concentration, C*, % of the mass.Replacement gas surfactant solution into the formation water potassium chloride type with mineralization M=15%The critical concentration, C* % of the mass.
OP THK0,3OP THK0,5
OP-70,3OP THK, Sinterol AFM-120,5
Arcopol0,3OP-70,5
Prevotsell WON0,3Arcopol0,5
Prevotsell WOF1000,3Tergitol0,5
OP THK, Sinterol AFM-120,3Prevotsell WOF1000,5
Tergitol0,3Lissabon0,5
Prevotsell EO0,3Prevotsell EO0,5
Prevotsell FO0,3Prevotsell FO0,5
Prevotsell FPS0,3Prevotsell FPS0,5
PRS1,0PRS2,5

From the presented data it follows that education in a porous medium pen nonequilibrium disperse systems provides increased gas saturation already at the displacement front to 0.7 to 0.8. This reduces permeability for water. Therefore, nonequilibrium dispersed system can effectively be used as a shielding gas volume flow beyond a certain isohypse, and to escape the invasion of water into the gas-saturated volume of storage.

The main option screen, determining efficiency is the efficiency of its functioning, is the width of the screen. The width of the screen is determined on the assumption that the particle gas or water must be filtered through the screen at a time θ (equal parts cycle injection or sampling), which is technologically justified from the condition reliable isolation of the gas flows outside storage or invasion of the edge of the water in the gas-bearing region during cyclic operation of the UGS. Depending on geological and technological features UGS time θ can be 90-100 days.

The width of the screen, i.e. the transverse size of lgfor reliable isolation of the gas volume is determined from the expression:

where P1and P2pressure value at the boundaries of the screen, MPa; kg- coefficient phase gas permeability, m2; m - porosity; µgthe viscosity of the gas in situ, MPa*s; θ is the time required shielding gas volume, C.

For a particle of water filtered through the screen in the gas-bearing zone, the required width of the screen lindetermined from the expression:

here kin- coefficient phase permeability for water, m2;

µinthe viscosity of water at reservoir conditions, MPa*s; θ is the time required shielding produced water, C.

From the formula it is seen that the width of the screen depends on the parameters of the reservoir permeability k and is Aristote m.

In these formulas, setting the necessary time shielding gas volume or invading brine water, determine the width of the screen.

Calculations performed using the main field characteristics of the underground storage facilities "Gazprom", show that the maximum width of the screen when the permeability of the formation of 0.65 μm2for isolation of the gas is 19-20 m, and to isolate the invading water enough screen width in 9-10 m width Calculation screen is shown in the example.

Determining the number of holes depends on the size of the insulated zone configuration screen and geological conditions, location of storage facilities. The total duration of the process of creating a screen through a group of wells is determined by the time of the injection of the surfactant compound in a well-to merge their paths in the reservoir with the formation of the project configuration screen TV and gas injection, foaming upload the solution before the formation of a stable screen.

When straightforward the location of wells, the time of injection of a solution of T1in injection wells until a solution of at least one adjacent the discharge hole, depending on the distance between the wells z and the flow rate Q is determined from the expression:

thus

where:

L is the length of the screen is a, m;

z is the distance between the wells in the chain;

n is the number of wells in the chain;

Q - the charge injection wells, m3/day;

m is the porosity of the shares;

h is the reservoir thickness, m,

S is the dimensionless outer radius of the screen, depending on the relationship of the flow rate of the injection wells to the rate of discharge, N=QAccel/ΣQZackthat is determined by the formula:

S=0,5609-0,2032ln(N);

where:

σ2- coefficient Wicke, b/R.

The coefficient Wicca is determined by the expression

where:

C, amaxaccordingly, the initial concentration and the maximum adsorption of the surfactant on the surface of the breed. Table 3 shows the values of coefficient Wicca for solutions of ethoxylated ALKYLPHENOLS in layers of different porosity, providing a stable deposition of the screen.

d is the coefficient of interference, depending on the relationship of the flow rate of the injection wells to the rate of discharge, N=Qtimes/ΣQZackthat is determined by the formula:

d=0,2048N-0,7256.

The volume of foam solution from a synergistic surfactant composition is determined depending on the number of wells, flow injection wells (rate of injection and the time of creation screen.

In the known invention patent of the RF No. 2375281 considered an analytical method for determining parameters of the screen, and the process of its creation, who is one only in straight-line arrangement of chains of wells. In the General case, the determination of the parameters of the create screen produced by numerical integration of systems of differential equations (8):

m=0.15
Table 3
Values of the coefficient Vicki σ2for solutions of ethoxylated ALKYLPHENOLS in layers of different porosity
OP SRC, Sinterol AFM-12S, % mass.0.50.60.70.80.91
porous mediumm=0.150.530.580.610.640.670.69
m=0.200.620.660.690.720.740.76
m=0.250.680.720.75 0.770.790.81
Prevotsell WOF-100S, % mass.0.50.60.70.80.91
porous mediumm=0.150.290.320.350.380.400.43
m=0.200.360.400.430.460.490.52
m=0.250.430.470.500.530.560.59
Prevotsell WONS, % mass.0.50.60.70.80.91
porous medium0.230.260.290.320.350.37
m=0.200.290.330.370.400.430.46
m=0.250.360.400.440.470.500.53

Qi=k Δp is determined by the results of the test wells.

Here k is the coefficient of performance of the reservoir, m3/day/MPa;

Δp is the repression of strata, MPa;

νx, νyprojection of the velocity of the particle solution on the coordinate axes x and y;

the x, y coordinate of the contour distribution of the active component of the solution;

aiinicoordinates of the i-th well;

σ2- coefficient Wicke, b/R.

To determine the volume V1and V2depending on the changes of N=QAccel/ΣQZackin a wide range, perform the numerical integration of equations (8) and determine the volume of injection solution composition, providing the necessary width of the screen l (10 m the Lee 20 m). By computer simulation of the process of creating a screen visualization solutions system allows us to consider different ways of ratios of flow rates and unloading expenses injection wells, which are shown in tables 4 and 5. However, it should be borne in mind that the realization of N=QAccel/QZackdepends on the possibility of using existing equipment - submersible and ESP and MCPK.

Table 4
The ratio of the volumes V1and V2depending on N=QAccel/ΣQZackwhen the screen width, 10 m
l=10 mQthe loading/QZack12345678910
V1%of 97.895,693,389,285,983,9an 80.2 77,775,871,7
V2%2,24,46,710,814,116,119,822,324,228,3

Table 5
The ratio of the volumes V1and V2depending on N=QAccel/ΣQZackwhen the screen width is 20 m
l=20 mQthe loading/QZack12345678910
V1%br93.1and 88.882,977,771,867,362,4 of 58.956,052,1
V2%6,9to 12.017,122,328,232,737,641,144,047,9

The weight of the surfactant composition required to create a screen is determined by the selected concentration of the foaming solution and its volume.

The installation screen should start at the end of the season selection to ensure the greatest repression on the layer.

Example: Determine the number of wells, the size of the screen, the surfactant composition and the volume of solution required to create a screen.

For comparison with the results of the prototype select the same data source.

The curvilinear length of the shielded zone of the mould, lithological window, peripheral abnormally high permeability zone) L=300 m;

The depth of the stratum H=1000 m;

Produced water potassium chloride type Sulino with General mineralization of M=150 g/l;

Pressure changes within 8-10 MPa, i.e. the maximum load on the screen is 2 MPa,

The thickness of the layer h=10 m;

The permeability k=0.65*10-12m2;

Porosity m=0,20;

The viscosity of the gas of 0.014 MPa*s;

The viscosity of the reservoir water of 1.8 MPa*S.

1) On the table (Karimov F Operation of underground gas storages, M., Nedra, 1981) select the main foaming surfactant OP-10 SNHC with a critical concentration above 0.5% and add synergistic surfactant component is 0.5% of the PRS.

2) curves, shown in figure 1, determine the front saturation s depending on the concentration (not less than 0.5% wt.) s=0,7.

3) By the formulas (1) and (2) determine the relative permeability to gas and liquid at

s=0,7: k*g=0,0001, k*W=0,003, therefore, kg=0,0001*0,65*10-12m2and kW=0,003*0,65*10-12m2.

4) Calculate the design width (transverse dimension) of the screen l. The transverse size of the screen l in synclinal mulde (or lithological window, or in the peripheral zone UGS) is determined from the condition of passing of gas particles through the screen at a time θ (a period of intense gas injection - 90 days) when pumping gas into underground storage facilities and particles of the edge or bottom water for a period of intensive selection - 90 days) in the selection of gas from underground storage facilities. The value of l is determined from the expression (3):

.

where P1and R2pressure value at the boundaries of the screen, MPa; kg- coefficient phase gas permeability, m2; m - porosity; µgthe viscosity of gas at reservoir conditions is s, MPa*S.

For a particle of water filtered through the screen in the gas-bearing zone, according to the formula (4) determine the minimum width of the screen l:

Thus, the width of the screen, created to prevent the flow of gas has a double stock for isolation of produced water.

5) the Optimum is an odd number of wells and 2-stage creation screen, when at the first stage in the odd (injection) wells have pumped with a flow rate of QZackand from even (unloading) wells produce pumping with flow rate Qthe loading>QZackwhere QAccel=k Δp is determined by the results of the test wells. Here k is the coefficient of performance of the reservoir, m3/day/MPa; Δp is the depression on the formation MPa.

6) For comparison with the results given in the prototype, for this example, the number of wells is equal to 3. Use existing wells, the layout of which is shown in figure 2.

7) Estimated time to approach the solution in a relief well is determined according to the visualized solution (2 and 3), and in the case of straight-line screen - according to the formula (5). This time compare with the actual time of receipt of markers of SLE. No. 1 and No. 3 and carry out the refinement of the parameters.

8) Estimated volumes of solutions V11and V31determine according to the visualized solution (2 and 3), in case the straight-line screen - according to the formula (7).

9) the Volume of solution V22, 50% of which will be pumped to the second stage in even a relief well # 2 after the arrival of the second gas of the marker is determined by the table 4 or 5, or computer modeling. This volume of solution after injection into the well # 2 pumped exhaust gas is equal to the in situ 2-3 volumes of pumped solution, provides the minimum required width of the screen.

10) the Results of calculations performed by the above formulas, are summarized in Table 6.

11) the Required amount of produced water for solution preparation for beginning work on the first stage, the pre-extracted from the reservoir.

12) After the completion of injection of the solution into each injection well spend the injection of exhaust gas until the token into the discharge hole.

13) the duration of the full cycle of creation screen includes the time of the injection solution and the gas injection: Tscreen=Tsacrist+TZach. The duration of each operation depends on the capacity of the well for injection solution for injection gas.

From the Table 6 data suggest that when carrying out the method according to the invention, while providing a guaranteed continuity of the screen savings on reagents is in the medium is 50%, accordingly, the energy of the injected solution, the pumping and disposal of produced water, and on the replacement of natural combustible gas in the exhaust gas savings ranges from 63 to 79 million rubles and environmental improvement in the area of UGS.

1. A method of creating a permeable screen in a porous medium under the underground storage of gas, including injection into injection wells foaming solution, the labeled individual markers, each of which corresponds to the injection well until foaming solution with a token corresponding to a given injection well, at least one discharge hole, the selection of the reservoir fluid from the discharge of the wells with a total flow rate, a large total flow rate injected into injection wells foaming solution, the injection of the foaming agents in the relief well after the occurrence of these solutions foam marker corresponding to at least two injection wells, characterized in that pre-determine the required volumes of the solutions in the inter-well spaces, sequentially pumped into injection wells 0,5-0,55 estimated volume labeled foaming solution and labeled gas prior to introduction of the program labeled gas into the discharge hole, then into the discharge bore pumping estimated volumes of solution and gas, providing the minimum necessary width of the screen.

2. The method according to claim 1, characterized in that the gas quality to create a screen using the exhaust gas compressor stations.

3. The method according to claim 1, characterized in that the gas quality to create a screen using non-combustible and (or) inert gases.



 

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22 cl, 2 dwg

FIELD: transport.

SUBSTANCE: invention relates to making underground reservoirs in rock salt formations. Reservoir is profiled using concentrically arranged tubes to lift brine, feed water and production pipes. Thereafter, water feed pipe is withdrawn to feed water feed column composed of flexible water feed pipe. Then, reservoir shape is corrected by feeding solvent at reservoir correction point via gap between brine lift tube and flexible water feed pipe of said column. Additionally, device comprises water feed column with flexible water feed pipe ropes arranged in symmetry about is cross-section and passed through rings rigidly secured to flexible pipe at regular spacing to connect flexible pipe bottom end with auxiliary winches.

EFFECT: expanded operating performances.

2 cl, 2 dwg

FIELD: mining.

SUBSTANCE: extracted rock is unloaded from a trolley to a bunker, from which it is supplied to a crusher and after that to a sump, in which a hydraulic fluid mixture of the required consistency is formed from crushed hard rock and water, which is pumped out of the sump with a low-pressure soil pump and supplied in turn to each segment of tubular loading device (TLD) arranged in the mine. Besides, pressure water is supplied from the reservoir installed on the surface by means of a pump via the pipeline arranged in the mine shaft to wash out the hydraulic fluid mixture from TLD and transport it via pressure pipeline to the surface to a sludge pond or a concentration plant, and the rest water in the segment after hydraulic fluid mixture washing-out is supplied via drain pipeline to the sump to form hydraulic fluid mixture.

EFFECT: creation of stepless single-flow scheme of hydraulic transportation for any development depth of mineral deposits at construction and operation of mines.

1 dwg

FIELD: transport.

SUBSTANCE: proposed plant comprises air blower, pressure pipeline, loading bin and feeder to supply cargo into pressure pipeline. Pressure pipeline consists of one or several plug-and-socket parts on blower side. Note here that arc-cross-section troughs are welded to said one or several parts with flange joints to make external bottom sections of said tube parts. Said troughs are connected via extra pipeline with gate to pressure pipeline adjoining air blower. Inner radii of curvature of trough R and pressure pipeline section R0 are interrelated by relationship R=R0+2δ, where δ is pressure pipeline wall thickness. Said external bottom sections of said tube parts confined by said trough is provided with holes. Sealed gate outlet tube is arranged at trough end section.

EFFECT: simplified design, lower costs.

1 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to woodworking and may be used for timber single-piece feeding to subsequent processing equipment. Buffer magazine comprises transverse chain conveyor. Stopping mechanism is arranged at the conveyor end. Said stopping mechanism consists of two composite sector blocks. Said blocks are bolted to bushes to be fitted on bevel drive shafts. The latter are engaged via rack and spur gear with crank mechanism. Angle between block sectors defines operating width of stopping mechanism.

EFFECT: simplified design, expanded operating performances.

6 dwg

FIELD: transport.

SUBSTANCE: invention relates to conveyors and may be used for receiving, conveying and keeping grain as well as venting and discharging the latter. Aerodynamic conveyor comprises blower, conveying channel with discharge opening and shutter, air distribution channel and air control web arranged there between. Said web consists of several interconnected sections and is controlled by air jet escape angle variation mechanism. Said air distribution web is composed of slot jets turning through 0°-180°. Said air jet escape angle variation mechanism is made up of links rigidly secured to slot jets axles on one side and, on the other side, to dog. Note here that said link feature L shape with threaded ends. Central links are provided with arrows rigidly secured thereon and aligned with graduated sector rigidly secured to said dog.

EFFECT: expanded performances, higher quality.

5 dwg

FIELD: oil and gas industry.

SUBSTANCE: invention refers to underground storage and reservation system of LNG for its accumulation and distribution to the consumer. LNG US is located below the ground level 1 at the elevation preventing the freezing of ground surface at the most long-term estimated storage of LNG. It is blocked off and protected along the perimeter from ground mass with a concrete wall of "wall in ground" type 2. It includes reinforced-concrete tank 5 located at the bottom from compacted ground 3 and heat-insulating intermediate layer 4, which is enveloped on external side surface with soft intermediate layer 6, and on the inner side it is covered with layers of heat insulation 7 and waterproof insulation 8 from LNG. LNG US is equipped with process shaft 9 with pipelines 10, which comes out of reinforced-concrete reservoir to ground surface 1, tight hatches 11 and stairs 12. Top of concrete reservoir is filled with a layer of light heat-insulating material 13. Vertical wall of reinforced-concrete reservoir 5 is made of single-type elements of constant curvature in the form of solid reinforced-concrete units 14 of constant section with surfaces 15 adjacent to each other. Along the perimetre of end surfaces 15 of reinforced-concrete blocks 14 and their centre there made are grooves of rectangular section with tightening horizontal and vertical 18 reinforcement installed in them (vertical 17 and horizontal 18 tightening reinforcement rods).

EFFECT: use of the invention ensures reliability of horizontal tightening of reinforced-concrete blocks; simplifying the construction procedure of side walls of reservoir; improving construction quality and operating reliability of LNG US.

5 dwg

FIELD: transport.

SUBSTANCE: device for batching and transportation of powder and/or loose solid material in a range of low or high pressure has housing containing inlet with input valve in input area, outlet with output valve in output area and linear drive actuating piston with variable speed of forward movement respectively back. The piston is made at least partially as hollow body with internal piston space and with at least one inward hole to accept material into internal piston space and outward hole to extract material from internal piston space. The piston at driving side rests on sealing support and is sealed by it relative to atmosphere, and at nondriving side the piston rests on scraping support which seals input area from output area relative to passage of solid material. In this device, there is bypass connecting input area and output area and there are pressure reducing valve and loading valve to establish pressure in internal device space including input area and output area.

EFFECT: invention provides better batching and transportation of materials without their compaction while providing equal pressures before and behind scraper support and excluding material throw-over.

22 cl, 8 dwg

FIELD: oil and gas production.

SUBSTANCE: proposed device comprises water feed tube with bottom head Note here that the latter features length exceeding radius of reservoir and is made of flexible water feed tube furnished with mechanical muscles secured thereto and pneumatically or hydraulically communicated with pressure source to control every muscle for positioning tube end in space.

EFFECT: higher efficiency.

3 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes performing a test pumping of liquid waste into absorbing well before operational pumping, while changing flow step-by-step. From equation of absorption base hydrodynamic parameters are determined for calculation of predicted coefficients of operation characteristics of absorbing well and reserve well. During operational pumping of liquid waste together with thermometry along absorbing well shaft, registration of actual pressures and flow on pump devices, actual pressures on mouth in tubing pipes of absorbing well, actual pressures on face are additionally registered in absorbing well as well as pressures on mouth in behind-pipe space, actual loss at mouth in behind-pipe space, actual loss of waste on mouth, actual positions of face well, upper and lower limits of absorption range from well mouth. In reserve well actual pressures on face are registered, as well as actual positions of liquid level from reserve well mouth, upper and lower limits of absorption range. Prediction coefficients are compared for operation characteristics of absorbing well and reserve well to actual coefficients. 9 conditions of hydrodynamic bed conditions at reserve well and absorbing well are considered during pumping of waste. Specific actions of operator on each condition are described.

EFFECT: higher reliability and trustworthiness.

1 ex

FIELD: mining industry.

SUBSTANCE: method includes compressing gas at compressor station to required feed pressure, and utilization of drop liquid, containing drops of compressor oil and gas, before gas-distributing substation with following pumping of gas into well. Utilization of drop liquid is performed via slanted cylindrical separator of centrifugal type and deep chemical cleaning block in form of two parallel-placed absorbers, operating alternately with replacement of processed absorbents. Separator and two absorbers are mounted at tank for collecting compressor oil.

EFFECT: higher efficiency.

2 dwg, 1 tbl

FIELD: materials handling facilities.

SUBSTANCE: invention relates to sphere of creation of fixing of rates of powder materials of different friability delivered for consumption at different ambient pressures. Method includes vibration of powder material in fill-in container insulated from ambient atmosphere, formation of suspension and delivery of suspension into transport main line. Suspension is formed by aeration of powder material by carrier gas in allotted volume of lower part of fill - in container separated by screen and is delivered into transport main line through jet. Rate of material is regulated by changing pressure of carrier gas in fill-in container or replacing jet with jet of other flow area. Suspension delivery into transport main line is cut off by discharge of carrier gas pressure from fill-in container into transport main line. Device for implementing the method has vertical housing forming fill-in container with charge and discharge holes and branch pipe to supply gas, pressure regulator, transport main line connected with discharge hole, second branch pipe to supply gas into zone of aeration of powder material. Device includes channel with shutoff valve connecting gas supply branch pipe with transport main line, spill screen forming zone of aeration of powder material in lower part of fill-in container with discharge hole, housing with holes separating zone of aeration from upper part of fill-in container with charge hole, vibrator arranger in its lower part and movable attachment unit of housing upper part.

EFFECT: provision of continuous delivery of materials of different properties, possibility of quickly cut off delivery.

8 cl, 2 dwg

FIELD: gas, oil, oil refining and other industries.

SUBSTANCE: invention relates to building and operation of underground reservoir in stable rocks, for instance, soluble salt deposits. Method includes delivery of water and putting out brine along water feed and brine lifting pipes placed one inside the other, charging and storing of gas in underground reservoir. After brine lifting, reservoir is dried and then is filled up with alternating layers of absorbent and inert porous material, volume ratio 2:1, delivered along clearance between water feed and brine lifting pipes. Brine lifting pipe is perforated in lower part in height of reservoir and it is installed in lower part of reservoir. Difference between angles of repose of absorbent and inert material does not exceed 10 degrees. This done, reservoir is filled with gas delivered along perforated brine lifting pipe.

EFFECT: increased productive volume of reservoir owing to sorption of gas on surface of absorbent, reduced cost of gas storing.

1 dwg

FIELD: materials handling facilities; transportation devices.

SUBSTANCE: invention can be used for taking loose material from pile. Proposed device contains horizontal transport channel with mating ports and pockets into which loose material gets and it is furnished with transport material line with support wheels and intake branch pipe for air flow means of which loose material from transport channel is delivered into transport material line. Inlet branch pipe is furnished with wedge like driver to deepen device into loose material. Ports of transport channel are provided with gates to adjust capacity of device.

EFFECT: enlarged operating capabilities, reduced energy consumption.

4 dwg

FIELD: mining industry.

SUBSTANCE: method includes driving a mine for cleaning sump and connecting it to sump in such a way, that mine soil for cleaning sump in place of connection is placed at level of shaft bottom, construction of water collector, located outside the shaft, and its connection with mine for cleaning sump, mechanized cleaning of sump. Transporting slope is driven to level of sump cleaning. Then water collector is driven. Mine for cleaning sump is driven with deflection towards water collector. Sump cleaning is performed by delivering spillage along transporting slope.

EFFECT: simplified operations, lower laboriousness.

6 cl, 5 dwg

FIELD: material conveying equipment, particularly pneumatic transport devices.

SUBSTANCE: pump comprises chamber with inlet valve for material feeding and air-discharge valve, compressed air pipeline having valve for delivering compressed air to chamber and material transportation pipeline. Pump is provided with expansion pipe having rectilinear section, opened end and curved end. Curved end of above pipe is located near transportation pipeline inlet. Connected to curved end are nozzle and dispersing means forming turbulent jet of air-and-dust mixture at transportation pipeline inlet. Pump also has aeration means arranged at compressed air pipeline outlet to provide counterflow heat exchange between compressed air and material located between aeration means and opened end of expansion pipe.

EFFECT: reduced consumption of transportation agent for powder and fine-grained materials conveyance.

1 dwg

FIELD: power engineering.

SUBSTANCE: proposed device contains service tank with two valves. Upper valve of service tank is normally open, and lower one is normally closed. Tubular shanks are connected coaxially and hermetically to lower surfaces of each valve. Each shank is installed for vertical shifting onto corresponding outlet end of pipe for impulse delivery of gas. Hydraulic restrictor is installed at outlet end of pipe for impulse delivery of gas.

EFFECT: increased distance of transportation of powder-like material.

1 dwg

FIELD: power engineering.

SUBSTANCE: proposed device contains service tank with two valves. Upper valve of service tank is normally open, and lower one is normally closed. Tubular shanks are connected coaxially and hermetically to lower surfaces of each valve. Each shank is installed for vertical shifting onto corresponding outlet end of pipe for impulse delivery of gas. Hydraulic restrictor is installed at outlet end of pipe for impulse delivery of gas.

EFFECT: increased distance of transportation of powder-like material.

1 dwg

FIELD: mechanical engineering; pneumatic transportation.

SUBSTANCE: proposed plant contains hopper, drum-type sluice feeder, material line, material separator and air duct to direct dust-laden air from material separator to dust trap. Plant is furnished with cross-flow fan with port made on base of scroll housing in zone of maximum air velocities and negative static pressure. Outlet branch pipe of drum-type sluice feeder is connected to said port to act onto material in fan housing by air jet and subsequent delivery of air and material along material line into material separator. Lower part of outer of housing of drum-type sluice feeder is directed along tangential line drawn through lower point of scroll housing port.

EFFECT: simplified design, reduced metal usage.

1 dwg

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