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Tamponaznye rastvory na uglevodorodnoj osnove v neftedobyce

100%

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

tom nr 150 wydanie konferencyjne

699--701

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.

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

75%

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

tom nr 182 wyd. konferencyjne

815--818

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.