Oil extraction method

FIELD: oil industry.

SUBSTANCE: method includes treatment of face area of oil bed by hydrophobic agent in organic solvent and pressing oil from collector with following delivery of oil from face area of product well for treatment of oil terrigenic bed, in form of hydrophobic agent solution of ethylene copolymer with vinylacetate in ethylbenzol or fraction thereof is used in relation 1:1 - 10, treatment of face area is performed with following ratio of components, in percents of mass: ethylene copolymer with vinylacetate 0.05-2.0, ethylbenzol or fraction 0.05-20.0, organic solvent - the rest.

EFFECT: higher efficiency.

2 tbl, 2 ex

 

The invention relates to the oil industry, and in particular to methods for increasing oil production due to the physico-chemical effects on the bottomhole zone wells.

In the extraction of oil from wells gradual deterioration of reservoir properties of the oil reservoir due to swelling clay, the formation of stable emulsions precipitation of various salts, hydration, rocks, asphalt-maloperation sediments and increased watering, as a result the performance of the wells decreases over time.

In order to restore the filtration parameters and productivity of oil wells, there are many different ways of formation treatment: heat, gas, microbiological and acoustic impact, fracturing, means of hydrochloric acid and mud acid treatment, abrasive jet perforating, the method of phase transfer catalysis and in-situ burning, as well as their various combinations.

However, most of them does not show a sufficiently high efficiency in the production and consuming of energy and the use of expensive materials. Particularly low efficiency of application of physico-chemical methods of stimulation.

There is a method of increasing oil recovery by simultaneous injection into the injection and provides the appropriate well of a suspension of hydrophobic powder. As hydrophobic powder uses fine-grained hydrophobic silica in an organic solvent with a concentration of from 0.05 to 1.0 wt.%. /patent RF №2105142, IPC 6 E 21 In 43/22, published 20.02.98/.

This method allows to increase the flow rate of oil wells up to 2.5 times with a slight decrease in water content of produced fluids (5-10%).

There is a method of extracting oil from oil-containing carbonate reservoirs, including the treatment of bottom-hole zone of injection or production well superfine water and kislotoustoichivam hydrophobic material, the injection of the acid or its solutions, displacement and delivery of oil from the well bottom-hole zone. As the hydrophobic material is used, the suspension is fine hydrophobic silica in an organic solvent /patent RF №2149989, IPC 6 E 21 In 43/22, published 27.05.2000/.

There is a method of enhanced oil recovery using suspension in an organic solvent, a hydrophobic - water repellent powder with a chemically modified surface (superfine powders on the basis of highly dispersed materials tetrafluoroethylene, polyvinyl alcohol, titanium oxide, silicon, iron, chromium, aluminum, zinc with boundary wetting angles from 114 to 178°, and the degree of hydrophobicity from 96,0% to 99.99%), including downloading the suspension into the well, creating high pressure in the wellbore area and squeezing the liquid, the exposure under this pressure /patent RF №2125649, IPC 6 E 21 In 43/22, published 27.01.99/.

To the greatest extent the technical result is achieved by treatment of bottom-hole zones of oil wells suspension of hydrophobic powder with a content of from 0.5 to 2.5 wt.% in an organic solvent.

In the study of well-known ways you can make the following conclusions: the most effective for the stimulation of oil in the processing methods of producing wells using well-known hydrophobic powders in a hydrocarbon solvent with a concentration of not less than 0.5-2%, a decrease which may lead to flooding of the bottom wells. During long-term operation inevitably lower concentrations (0.5 to 2%) of hydrophobic powder on the surface of the collector due to its desorption and removal of the bottom-hole formation zone (PPP), this affects the duration of action of hydrophobic agent is at lower concentrations there is an inversion of wetting, that is, the surface of separation of the phases becomes hydrophilic and there is danger of breaking the produced water to the bottom oil wells, which will lead to adverse effects (increased production of produced water). In addition, it shortens the turnaround of events to operate the operating wells.

The disadvantages of the known methods using hydrophobic agents is that uploading them at elevated concentrations often leads to plugging of the pore space of the bottomhole zone of the formation due to the comparability of the pore size with a particle size of suspensions of hydrophobic powder, which limits their use in low-permeability reservoirs. In addition, the suspension is an unstable system and prepared immediately before injection, which requires additional equipment. Technology solution preparation of highly dispersed hydrophobic powder of oxides of silicon and oxides of metals requires special conditions (respirators). Modified oxides are very expensive components, and use them in the processing of wells, at the late stage of development unprofitable.

The objective of the invention is to increase the efficiency of the method by preventing the decrease with time of the hydrophobic effect.

The problem is solved by the method of oil extraction, including the treatment of bottom-hole zones of oil-containing layer of a hydrophobic agent in an organic solvent, and the displacement of oil from the reservoir with subsequent delivery of oil from the bottom zone of the production well. Moreover, for processing neftesoderzhashchikh layer as a hydrophobic agent use a solution of a copolymer of ethylene with vinyl acetate in benzene or etilbenzene fraction in a ratio of 1:1-10, the treatment of bottom-hole zone is carried out at the following ratio, wt.%: a copolymer of ethylene with vinyl acetate 0,05-2,0, ethylbenzene or ethylbenzene fraction of 0.05 to 20.0, organic solvent - rest.

Table 1 - assessment of the hydrophobic effect of the compounds, depending on the concentration of components used in table 2 - change in permeability of water and oil in the processing of 0.1% claimed hydrophobic agent in a hydrocarbon solvent.

Methods of assessment hydrophobic elevation of water in the capillary

The solution is hydrophobic agent in an organic solvent impregnated activated and inactivated quartz sand with a diameter of 0.14 to 0.25 μm, activated sand - hydrophilic (Hcl treated) and inactivated sand (not processed Hcl, partially hydrophobic). Dried in a drying Cabinet for twenty-four hours or until dry. Sand, soaked and dried, rolled up in a tube height of 16 cm with a Shoe through the funnel. Condense laboratory shaker 250 cycles per minute at an amplitude of 4 for 15-20 minutes. Filled tubing with active and neaktivirovannye sand treated with the investigated solutions, put in a conical flask with distilled water (always the same). Note the time. Stand for five hours, replace the Yaya height of rise of water in capillary through every 10 minutes.

Example 1. Prepare the hydrophobic agent is a mixture of CMEA with ethylbenzene (EB) in a 1:1 ratio. This agent is mixed with an organic solvent (diesel fuel - diesel fuel) at a concentration of CMEA 0,05%, DL - a 0.05%, organic solvent - rest. At the present methodology prepared by the reagent impregnated with quartz sand (activated and non-activated) with a diameter of 0.14 to 0.25 μm.

Dried within twenty-four hours or in a drying Cabinet to dry. Sand, soaked and dried, rolled up in a tube height of 16 cm with a Shoe through the funnel. Condense laboratory shaker 250 cycles per minute at an amplitude of 4 for 15-20 minutes. Filled tubing with active and neaktivirovannye sand treated with the reagent solution in diesel fuel, put in a conical flask with distilled water (always the same). Note the time. Stand for five hours, measuring the height of rise of water in capillary through every 10 minutes.

The results of the experiments are shown in table 1.

However, when the transition to industrial testing is necessary to take into account the complex geopoliticheskie conditions; the heterogeneity of sites with different degree of saturation and the water content, the degree of desorption of water-repellent with rocks, the fact that low concentrations and possible Hydrophilidae his behavior, which can the lead to the formation water breakthrough. It was therefore conducted a series of experiments by determining the change in the permeability of water and oil before and after treatment with the composition of the reservoir models with different filtration characteristics, different water and oil saturation, assessed the degree of desorption of water-repellent surface species during filtration of oil and water. After what has been estimated coefficients of the relative permeability of oil and water before and after processing a hydrophobic agent, the calculated degree (ratio) increase for oil and reduce water.

Example 2. In models of the reservoir as the porous medium used medium-grained quartz sand (0,140-0,315 mm). As a "dry" sand were calcined quartz sand; "initial wet" "dry" sand, through which was filtered one pore volume of water; "initial saturated" -"initial water-saturated sand through which was filtered one pore volume of oil; "residual oil" - "initial oil-saturated sand through which was filtered volume of water required to achieve full water coming from the reservoir model fluid.

To determine the relative permeability of the formation model measuring the transit time of each 20 ml (1 pore volume) of water or oil through the reservoir. The experiment is carried out when the OS is enough pressure of 0.01 ATM. (8 mm RT. Art.). Vacuum stop after the alignment phase boundary liquid - air interface liquid - breed.

Similar experiments were carried out with disintegrated core carbonate rocks after processing the inventive reagent.

The calculation of the coefficients of permeability of oil and water before and after processing of the inventive composition is made according to the law Darcy.

From the obtained data shows (table 2)that in the General case for all models of the reservoir there is a decrease in the relative permeability for water (up to 11 times) and a significant increase in the relative permeability to oil (up to 9 times).

It should also be noted that the pumping 30 pore volumes of water under laboratory conditions corresponding to the complete washing of oil-saturated model of reservoir water, does not lead to desorption of hydrophobic agent from the surface of the breed, this can be judged by a constant rate of filtration of water through the formation model.

The results of the experiments are given in the table show that the proposed method effectively increases the permeability intervals with an initial saturation and thus practically does not reduce the productivity of high-permeability intervals with residual oil saturation, and the productivity of high-permeability intervals is restored to the original is. The latter is important to extract residual oil is washed out and transported by water flow, and the better, the higher the filtration rate in the bottom hole zone of the well.

Our method allows to increase the permeability of oil up to 9 times and lower permeability for water up to 11 times (see tab. 2). Known hydrophobic powder in the hydrocarbons under the same conditions leads to a decrease of the permeability of high permeability that impedes their effective development and can lead to lower final oil recovery.

In addition, the use of the proposed method with CMEA, highly adhesive, acid - and water-repellent properties, reduces corrosion of oilfield equipment. Used in the way that the hydrophobic agent is cheaper than the known silicone hydrophobic powder in 20 times, thereby reducing the cost of technology for hydrophobic powders.

The oil extraction method, comprising the treatment of bottom-hole zones of oil-containing layer of a hydrophobic agent in an organic solvent, and the displacement of oil from the reservoir with subsequent delivery of oil from the bottom zone of the production well, wherein for processing oily terrigenous square is one hundred as a hydrophobic agent use a solution of a copolymer of ethylene with vinyl acetate in benzene or etilbenzene fraction in a ratio of 1:1-10, the treatment of bottom-hole zone is carried out at the following ratio, wt.%:

A copolymer of ethylene with vinyl acetate 0,05-2,0

Ethylbenzene or ethylbenzene fraction of 0.05 to 20.0

Organic solvent Else



 

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EFFECT: higher productiveness.

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FIELD: oil and gas extractive industry.

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EFFECT: higher efficiency.

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EFFECT: higher efficiency.

2 tbl, 2 ex

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EFFECT: increased yield of biogas to continuously effecting culturing of microorganisms.

1 dwg, 2 tbl

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