Wyniki wyszukiwania - BazTech

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Tehnologia gidrorazryva plasta s odnovremennoj vodoizolaciej tehnologiceskimi zidkostami na uglevodorodnoj osnove

Magadova L., Efimov N. N., Cerygova M. A.

Prace Naukowe Instytutu Nafty i Gazu

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2012

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nr 182 wyd. konferencyjne

811--814

EN

The method of oil and gas reservoir engineering by hydraulic fracturing (HF) is used worldwide. The practice shows а continuous decrease of production rates after fracturing and а water cut increase. The analysis of published data and HF field experience showed that design of the method for preventive or HF combined waterproof is urgent.

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Rezultaty primenenia kompleksnoj tehnologii selektivnoj vodoizolacii na neftanyh mestorozdeniah zapadnoj Sibiri i Turkmenistana

Efimov N. N., Magadova L., Efimov M. N., Tejmurov V. N., Kozlov A. N., Sidginov Z. A.

Prace Naukowe Instytutu Nafty i Gazu

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2012

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nr 182 wyd. konferencyjne

815--818

EN

То improve the efficiency of squeeze jobs using selective compounds on the basis of waterless cement slurry (WCS) there was developed the соmрlеx technology of selective water shut-off in which а selective composition — hydrocarbon solution of а water-repellent surfactant and (or) inverse emulsion based on it — is injected before the WSC, depending on the well injectivity. In the process of injection waterproofing composition occurs the destruction of the water fi1m, squeezing out water from the bottom zone. The hydrophobic agent is attached to the rock surface, preventing its resaturation. High selective and isolating properties of the given соmрlех technology of selective water shut-off by the ехаmрlе of the oilfields of the Western Siberia and Turkmenistan are confirmed.

3

Kompleksnaa tehnologia remontno-izolacionnyh rabot v dobyvausih skvazinah s primeneniem vodoizoliruusih selektivnyh sostavov na uglevodorodnoj osnove

Efimov N. N., Silin M. A., Magadova L. A., Efimov M. N.

Prace Naukowe Instytutu Nafty i Gazu

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2010

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nr 170 wyd. konferencyjne

873--879

EN

The use of waterless, oil-based slurry (WOBS) for selective water isolation in oil wells has shown high efficiency in squeeze jobs in which the kill fluid was replaced with oil after killing а well, and after that the slurry was рumped in the perforation interval. When the WOBS was pumped in the water-cut oil well with a small volume of the oil spacer, the efficiency was very low. During the period of well operation, well control, squeeze jobs, and stimulation jobs, the bottomhole formation zone is affected by water. Water from the reservoir gets into the oil wells during the late stage of reservoir development. As a result of this, a water saturation zone forms around the well, decreasing the reservoir pore volume. This is especially characteristic for low permeable hydrophilic formations. Water permeability grows with the growth of water saturation; whereas oil permeability falls because of capillary strength, and the blocking of the bottomhole zone with bound water. During the pumping of the hydrophobic compositions, the water layer is destroyed, and water is taken away from the bottomhole zone. The hydrophobic reagent is adsorbed on the formation surface preventing recurrent hydration. The new, complex technology of squeeze jobs using the selective oil-based solutions was designed for improving the efficiency of squeeze jobs. This technology consists in the pumping of a hydrocarbon solution of surfactant-oil wetting agent and/or an inverted emulsion based on surfactant-oil wetting agent before the use of WOBS.

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Tamponaznye rastvory na uglevodorodnoj osnove v neftedobyce

Efimov N. N., Efimov M. N., Magadova L. A.

Prace Instytutu Nafty i Gazu

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2008

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nr 150 wydanie konferencyjne

699--701

EN

In a squeeze job, after the pumping in of the water shut-off agent, after placing the cement plug, and eliminating the cross flow behind the casing, cement slurry is usually used. Cement slurry is prepared without any agents which lower filtration, which regulates the sedimentary stability and the Theological quality of the cement solution. The success of a squeeze job does not usually exceed 60%. At the Gubkin Russian State University of Oil and Gas, oil-based cement slurries were developed. They are: a waterless, oil-based cement slurry (WOBCS) and oil-based, emulsion cement slurry (EOBCS). WOBCS can be used for the following operations: isolation of whatever zones of ingress water (water underlying in the water-bearing bed, pulled up by vertical coning, or in the interstratal water-bearing bed) in oil wells and isolation of zones of ingress water by well drilling, fracturing with isolation water-bearing intake beds of productive areas, casing leak repair, and elimination of the cross flow behind the casing. The distinctive peculiarities of the oil-based, emulsion cement slurry (EOBCS) are that it has a high sedimentological stability, insulating property, and high plasticity. In response to these qualities, EOBCS can be recommend for use in the elimination of the cross flow behind the casing, including the oil cross-flow to the incumbent water-bearing bed, and for the placing of the cement plug with following punching. Cement does not crack under perforation due to its high plasticity and it maintains its insulating properties at variable well loads by repression and depression of the productive layer.