Method of joined development of oil and potassium deposits

FIELD: mining industry.

SUBSTANCE: invention comprises following scheme. Oil is produced from producing wells. Potassium salts are extracted from mines and processed. Solutions are pumped into deep lying porous rock formations preliminarily revealed between oil-bearing and potassium formations. Those porous rock formations are chosen which are located below underlying stone salt. Pumping of solutions is effected through injecting wells until pressure drop in oil-bearing formation is compensated to a value sufficient to prevent deformation in potassium formations, this value being calculated using special math formula. Oil formation is then run while maintaining compensating pressure in chosen porous formation.

EFFECT: significantly reduced environmental loading and increased safety of mining operations.

3 cl, 1 dwg

 

The invention relates to the mining industry and can be used for joint development of oil and potash deposits.

The known method the joint development of oil and potash deposits, including oil from production wells and water flooding of the oil reservoir through injection wells, extraction in mines, processing of potash and disposal of liquid waste disposal in deep horizons (Tolkachev G.M., etc. Some results of research on integrated development of mineral resources of the Central part of Solikamsk depression: Sat. //The petroleum potential of the regions ancient neptunalia. - Novosibirsk, Nauka, 1982, - p.75-78).

The disadvantage of this method is the rapid reduction in permeability reservoirs due to swelling of clay fraction.

The closest in technical essence of the present invention is a method for the joint development of oil and potash deposits, including oil production and water flooding of oil reservoirs, production in the mining and processing of potash salts, and water flooding of oil reservoirs using chloride solutions with Na concentration 5-28%, which is prepared from excess brine potash production. (Patent No. 2095556, MKI6E 21 In 43/22, E 21 41/20, publ. in BI No. 31, 1997).

The disadvantage of this method is to create a large pressure is to pump brine directly into the oil reservoir to maintain reservoir pressure.

The technical result of the invention is to reduce the harmful effects on the environment due to disposal of liquid chloride or sulphate waste potash production and improving the safety of mining in potash mines by preventing deformation at the level of potash seams.

This technical result is achieved in that in the method the joint development of oil and potash deposits, including oil from production wells, production in the mining and processing of potash salts, the injection of fluids into deep porous rock strata, pre-reveal layers of porous rock that are between the oil and potash strata of which select the layer below the underlying rock salt, and then produce the injection of fluids through injection wells to compensate for the pressure drop in the oil reservoir by an amount sufficient to prevent deformation in the potash layers, which are calculated according to the formula

where Np- depth of a selected porous reservoir for pumping solutions;

Hnthe depth of the oil reservoir;

ΔPnthe magnitude of the reduction of pressure in the oil-bearing formation,

and refinement of oil is Lasta produce while maintaining the compensating pressure in the selected porous layer, at the same time as solutions using liquid chloride or sulphate waste potash production, and mining of potash layer takes place simultaneously with the oil reservoir.

The invention is illustrated in the drawing, which shows a diagram of the location of the reservoir for pumping liquid waste.

With the joint development of potash salts and oil fundamental is the question of priority of their development and mutual negative influence.

When first working on potassium beds, which occur at depths of 200-400 m, their influence on the oil-bearing strata with depth ≈2000 m is negligible and will not complicate their development.

However, ahead of oil will cause a change in the stress-strain state of all of the overlying rock mass, including potash seams, which greatly complicate the notch potash seams or make it completely impossible.

Oil production will cause a change in reservoir pressure on the value of ΔPnwhile out of equilibrium system of forces: gravitational force of the overlying rocks (R=γNnis the reaction of the formation.

The value of the reservoir pressure will be

P1=γNn-ΔPn,

where P - pressure;

γ - volumetric weight breeds;

Hnthe depth of the oil place the A.

This will cause deformation of rocks resting in the roof of a petroliferous reservoir and then the entire thickness of the rocks.

To prevent the occurrence of these deformities is necessary to create the compensating pressure in the reservoir, located above the working oil reservoir, the largest reservoir pressure which will be

P2=γNp-ΔPR

where P2- the value of the reservoir pressure in the porous reservoir;

Hpthe depth of the porous layer;

ΔPp- change the pressure in the porous layer.

To do this, choose deep porous permeable layer between oil and potash strata and below the underlying rock salt, which performs gidroizoliruschim function, and carry out the injection of liquid waste into the porous layer.

The method is performed in the following way.

Initial development of the oil reservoir 1 through the oil hole 2 causes deformation of rocks resting in the roof of a petroliferous reservoir, and further, the entire thickness of the rocks on some size εn- 7. This will cause deformation of the potassium layer 3, which must be addressed at a later date.

In order to avoid deformation at the level of potash layers 3, it is necessary to provide a compensating pressure in rocks located between cal the emergency and oil reservoirs. To do this, first identify the layers of porous rocks, located between the oil and potash strata of which select the layer below the underlying rock salt 4. Next to the oil well 2 are injection well 5 to the selected porous rock formation.

Then via the injection well 5 have pumped fluids in porous rock layer 6 to achieve it compensating pressure sufficient to prevent deformation in the potash layers, which is determined by the relation

where Np- depth of a selected porous reservoir for pumping solutions;

HNthe depth of the oil reservoir;

ΔPpthe magnitude of the reduction of pressure in the oil-bearing formation.

As solutions for injection into a porous rock formation can be used to excess chloride brines or sulphate solutions of potash production, cooked in a special way (KNOW-HOW).

The use of the present invention will significantly reduce the environmental tensions in the industrial area due to the placement of excess liquid chloride or sulphate waste of potash production in deep horizons, to undertake the testing of oil, and the ATEM potash layers by preventing deformation of the latter.

1. The way the joint development of oil and potash deposits, including oil from production wells, production in the mining and processing of potash salts, the injection of fluids into deep porous rock layers, wherein the pre-reveal layers of porous rock that are between the oil and potash strata of which select the layer below the underlying rock salt, and then produce the injection of fluids through injection wells to compensate for the pressure drop in the oil reservoir by an amount sufficient to prevent deformation in the potash layers, which are calculated according to the formula

where Npthe depth of the porous reservoir for pumping solutions;

Hnthe depth of the oil reservoir;

ΔPnthe magnitude of the reduction of pressure in the oil-bearing formation,

and refinement of the oil reservoir is produced while maintaining the compensating pressure in the selected porous layer.

2. The method according to claim 1, characterized in that the quality of the solutions used liquid chloride or sulphate waste of potash production.

3. The method according to claim 1, characterized in that the mining of the potash layer takes place simultaneously with the oil reservoir./p>



 

Same patents:

The invention relates to mining and can be used in the development of salt deposits

The invention relates to the mining industry and can be used when developing outburst plots potash seams by means of longwall mining with dredging complexes

The invention relates to techniques for mining underground salt dissolution in mineral resources, mainly to the mining and chemical industries, and can also be used in other industries, manufacturing production brines through boreholes
The invention relates to mining and can be used in underground development of potash deposits in zones of influence of local changes
The invention relates to mining and can be used in underground development of potash deposits in areas replacement of sylvinite rock salt

The invention relates to the development of deposits of mineral salts in the safety pillars around exploration wells, where up to 20% of the stock of minerals

The invention relates to the development of salt deposits chamber system with rigid roof maintenance

The invention relates to mining and can be used in underground development of deposits of mineral salts containing ancient microorganisms in a viable state
The invention relates to mining and can be used in the development of potash deposits, occurring in salt sadiah, in the roof which are bromantically patterns

FIELD: oil extractive industry.

SUBSTANCE: method includes electro-hydraulic treatment of bed at resonance frequency and extraction of oil from bed. According to invention bed is excited by resilient pulses at broad frequency range from 0 to 10 kHz. Frequencies are set, at which bed is treated. Resonance frequency is kept by singular, periodical, radially focused electro-hydraulic pulses with generation frequency, divisible by bed resonance frequency. Concurrently in adjacent well bed excitation frequency is controlled by resilient pulses and corrected according to measurements results.

EFFECT: higher efficiency.

2 dwg

The invention relates to the oil industry and can be used in the development of oil fields with the use of horizontal wells, mainly in layered and choppy layers

The invention relates to the oil and gas industry, in particular to methods of enhanced oil recovery medium and high viscosity, and can be used for processing bottom-hole formation zone and the oil reservoir as a whole

The invention relates to the oil industry and is intended for maintaining reservoir pressure at oil fields
The invention relates to the oil and gas industry, and in particular to methods of enhanced oil recovery and injection of the agent into the reservoir

The invention relates to the field of development and exploitation of oil fields, in particular to methods of optimization of process of extraction of oil from the reservoir
The way oil and gas // 2239697
The invention relates to the oil and gas industry and can be used in the extraction of hydrocarbons
The invention relates to the mining industry and can be used in the extraction of methane from coal seams

The invention relates to the oil industry, specifically to the development of oil fields with contour injection of the displacing agent, especially at low and low initial oil saturation, respectively, with a low coefficient of oil displacement of the injected water

The invention relates to the oil and gas industry and can be used for extraction of heavy viscous oil

FIELD: oil extractive industry.

SUBSTANCE: method includes electro-hydraulic treatment of bed at resonance frequency and extraction of oil from bed. According to invention bed is excited by resilient pulses at broad frequency range from 0 to 10 kHz. Frequencies are set, at which bed is treated. Resonance frequency is kept by singular, periodical, radially focused electro-hydraulic pulses with generation frequency, divisible by bed resonance frequency. Concurrently in adjacent well bed excitation frequency is controlled by resilient pulses and corrected according to measurements results.

EFFECT: higher efficiency.

2 dwg

Up!