Method for increasing coal and hydrogen yield of fuel bed

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling long horizontal wells in bed and effecting on bed through them. Most of bed is covered by these wells. Along whole length of them explosive substance is placed to provide explosion temperature for length unit of well from 3500 to 1400 kcal/m and filling volume of horizontal wells by explosive substance from 5 to 20% during filling of remaining wells volume by liquid. After explosion, a packer is lowered into cased portion of wells.

EFFECT: higher efficiency.

3 cl, 1 tbl, 1 dwg

 

The invention relates to the problem of increasing uglevodosoderjati fuel reservoirs, including oil recovery from oil reservoirs, coal methane output and the condenser base(gas)return condensate reservoirs.

There is a method of increasing uglevodosoderjati fuel reservoir by drilling long deviated horizontal wells /1, 2/. Uncased horizontal portion of the well has a higher inflow thereto of hydrocarbons, primarily due to the large length of the drilling channel (compared to vertical wells). However, using only the natural permeability of the fuel reservoir limits uglevodorodami from him.

Another known technical solution is the method of thermal (fire) effect on the horizontal part of the well to active fracturing in the array adjacent to drilling the horizontal well bore /3, 4/. However, this method has the disadvantage primarily in educational opportunities legkonastraivaemy gas mixture and its explosion in an oil production well.

The closest technical solution is used to improve ProductCode fuel reservoir explosives on the bottom of the wells /5/. However, this method is not optimized placement of the explosion is atih substances and technological regulation of the explosion, and therefore, not achieved the maximum effect from the effects of blast waves on the fuel reservoir.

The aim of the invention is to increase uglevodosoderjati the fuel reservoir through the maximum use of the blast wave in a mountain array.

This goal is achieved by the fact that along the length of the horizontal wells are placed in a solid shell, explosive, provide warmth explosion per unit length of channel from 3500 to 14000 kcal/m, and the occupancy volume horizontal wells explosive perform equal to from 5 to 20%, and before the time of the explosion in the cased portion of the horizontal well lower packer. For maximum coverage of the mountain massif drilling a series of horizontal and vertical wells. In addition, for part-time work and nudebody fuel reservoir Buryats, respectively, in the soil and the roof horizontal wells, carrying them above the explosions. To improve the recovery rates of hydrocarbons in horizontal wells (as of fall of the output) pump special components such as carbon dioxide, nitrogen and other

Comparative analysis of the claimed solutions to the prototype and analogues shows that the proposed method offers specific proposals for the placement of explosives along the horizontal wells, including the heat of the explosion at unit length of the channel and the occupancy of the last volume. For more coverage of the mountain massif is proposed to drill a series of horizontal wells including in the soil and the roof of the fuel reservoir, respectively, for processing and nudebody.

All these differences correspond to the criterion “novelty” of the claimed invention. In a known way /5/ not specified technical parameters of placing explosives and thermal characteristics of the explosion. In addition, the drilling of horizontal wells in the ground and the roof of the fuel reservoir favors unloading and loss of strength of the rock mass in General, and therefore, intensive extraction of hydrocarbon raw materials. This allows to make a conclusion on the conformity of the proposed method inventive with the criterion of “significant differences”.

The drawing shows a fragment of the tilt-horizontal wells placed in her explosive.

The proposed method of increasing uglevodosoderjati fuel reservoir are presented for the case of a coal seam and learn from hell(AB)sorbed methane. Implemented it as follows.

On coal seam 1 drilled deviated horizontal wells with 2 lined 3 (cement ring 4) and uncased part 5. The length of horizontal wells placed in the solid shell of the regular explosive 6. The rest of the volume Horiz is Stalnoy wells filled with water 7 (in the case of oil or gas condensate channels, respectively, of oil or condensate). After installation in the cased part 3 of the well packer device 8 is triggered by the explosion of the explosive 6 along the entire length of horizontal wells 5.

An explosion of matter 6, placed under water, is characterized by weak attenuation of shock waves due to the low compressibility of water. The explosion occurs, the gas bubble, the pressure inside reaches several thousand atmospheres. When this occurs is due to the expansion of the gas shock wave that is compressed, it expands. As a result of mechanical stresses in the layers of coal seam mechanically destroyed and there are significant permanent deformation.

Experimentally it was recorded that when the diameter of the horizontal channel is about 150 mm at a distance of 1 m from the pressure reaches 1500 ATM, with the pulsation period of the shock wave (gas bubble) is only 0.3 to 0.5 C.

A separate experiment was aimed at determining the density of the explosive (TNT) along the length of the horizontal channel. The results of this experiment are presented in the table.

Table
No. p.pThe occupancy rate of the drilling channel explosive, %Specific heat of explosion, kcal/mThe pressure in the shock wave, and the m The injectivity of horizontal channel, m3/h·m
1. 2. 3.1,0

2,0

3,0
706

1415

2120
852

1010

1243
25

43

52
4.

5.

6.
5,0

15,0

20,0
3530

10560

13847
1431

1520

1600
64

68

71
7. 8.25,0

30,0
17662

21120
1515

1345
61

59

Horizontal wells with a diameter of 146 mm and a length of 100 m was subjected to the proposed method of coal seam methane output. The performance criteria were adopted and the pressure pulse shock wave and pick-up after the explosion. According to experimental data, the optimal value of the packing density of TNT in the channel, i.e. the specific heat of the explosion was adopted value 3500; 14000 kcal/m After reaching the heat of the explosion 14000 kcal/m starts to decrease pressure in the coal at the border with water and as a consequence drop the specific pickup processed by the explosion of horizontal wells.

When the values of heat of explosion below 3500 kcal/m was observed a sharp decrease in pressure in the gas bubble on the border with water and specific injectivity of horizontal wells.

In a separate experiment ante was also recorded, when completing horizontal wells explosive from 5% to 20% of the pressure in the shock wave is maximum. When filling more than 20% of the shock wave in a small volume of water is weakened, and when filling fewer than 5% of the explosive charge is not enough to increase the pressure in the shock wave and intensive softening of the fuel (coal) seam.

For wide coverage razuprochnenie fuel layer in the inventive method provides for the drilling of multiple oblique-horizontal wells, the location of which may be different and should be determined by the specific geological conditions of occurrence of the fuel reservoir.

Also provides a very effective means of influence on the discharge of the fuel reservoir is his job and nadrabotki. This is accomplished by drilling into the ground and the roof of the fuel (coal) seam horizontal wells which are explosions in the aquatic environment on the above technologies.

Explosion in wells carried out only after the installation at the end of their cemented part of the packer device. This is necessary to preserve the integrity of the well, in General, and without which it is impossible to resist high pressures in the horizontal part of the well after the explosion.

At the last stage of extraction of hydrocarbon raw materials in Appl the reception invention provides for the injection razuprochnenie layer of CO 2N2and other components that facilitate desorption of methane (in the case of a coal seam) or the displacement and liquefaction of hydrocarbons (in the case of oil or gas condensate reservoir).

Thus, the inventive method is based on the destructive effect of the shock wave in the fuel reservoir filled with liquid (water, oil, condensate). Its use ensures intensive microfracture solid particles of the fuel reservoir, the weakening of the latter. This naturally leads to uglevodorodami fuel reservoir, the main elements of the proposed technologies to raise uglevodosoderjati fuel reservoirs tested in field and laboratory conditions.

It is planned to implement in the southern Kuzbass coal seam, in the Krasnodar territory in depleted oil reservoirs in North-Western Siberia (Vuktylskoye gas condensate field) in the gas-condensate reservoirs with large residual condensate.

Economic and energy efficiency of the proposed method can be very high and is primarily due to the involvement in the energy sector new sources of hydrocarbons (coal bed methane, oil medium and high viscosity, gas condensate).

Sources of information

1. Bourget J. and other Thermal methods of EOR, M.: Nedra, 1988.

2. Yar is NIN S.A. and other Experience of carrying out gas-dynamic impact on hydrocarbon array through the borehole with a horizontal end of the barrel. M: Coal, 1990, No. 6, p.18-20.

3. Patent No. 2054557, E 21 F 7/00, 1996.

4. Patent No. 2054557, E 21 In 43/24, 1996.

5. Adushkin V.V. Tikhomirov A.M. Wave compression in the explosion of a cylindrical charge in hard environment. J. “journal of mining science”, 1986, No. 4, ñ.38-47.

1. The way of increase of uglevodosoderjati fuel reservoir, which consists in drilling through the formation of the mountain massif long horizontal wells and exposed to through them on the fuel reservoir, characterized in that a large portion of the fuel reservoir cover horizontal wells along the entire length of which is laid in a continuous shell of the explosive with the provision of the heat of explosion per unit length of the borehole from 3500 to 14000 kcal/m and filling the explosive volume horizontal wells from 5 to 20% when filling the remaining volume of borehole fluid, in this case, before the time of the explosion in the cased portion of the horizontal wells lower packer device.

2. The method according to claim 1, characterized in that the ground and the roof of the fuel reservoir are drilling horizontal wells, carried out through them explosions and accordingly work and nakabatay fuel reservoir.

3. The method according to claim 1 or 2, characterized in that a horizontal well after the conduct is of explosions pump carbon dioxide, the nitrogen.



 

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