Study of a reagent-emulsifier for the preparation of reverse water-oil emulsions used for well-killing

UDK: 622.276.7

Key words: water-oil inverse emulsion, well-killing fluid, hydrophobic-emulsion composition, emulsifier, electrical cables, thermal stability, rheological properties

Authors: V.P. Bondarenko, K.S. Nadirov, V.G. Golubev, A.S. Kolesnikov, A.S. Sadyrbaeva (M.O. Auezov South Kazakhstan State University, Kazakhstan, Shymkent)

This work presents the results of laboratory tests of properties of emulsion compositions stabilized with additives obtained on the basis of modified cotton tars that may be used as fluids for overhaul and well killing. Developed the formulation of the emulsion composition, components of which are: oil, water (or brine water), calcium chloride and emulsifier of brand Emulsol – GHM. We experimentally justified that the developed emulsion composition allows to improve such properties of liquids for well killing as aggregate resistance, thermal and electrical stability. The conducted research gave an opportunity to highlight the key parameters and define the dependencies to develop an efficient technological fluid composition, which can be used for killing of wells with high formation temperatures up to 80 ⁰С. It has been proven for improving the aggregative resistance of the process fluid at t= 80^oC within no less than 3 days for the water phase it is necessary to add more than 5% (mass) of  CaCl₂  containing in the composition of emulsifier Emulsol-GHM more than 3% (mass). It has been experimentally defined that the effective viscosity of the hydrophobic-emulsion composition stabilized by emulsifier Emulsol-GHM more than 3% of the masses can change considerably when the content of the aqueous phase is from 50 to 90% and a significant increase of this parameter is observed with increasing of aqueous phase from 75 to 90%. It is found that when the content of the aqueous phase is from 80 to 90% the effective viscosity with increasing the temperature from 20 to 80 °C increases with lower shear rates. This process is accompanied by the decrease in the thickness of the hydrocarbon layer, which creates a layer effect and protects the aqueous phase in the reverse emulsion. It should be noted that increasing the concentration of CaCl₂ in the aqueous phase of the hydrophobic-emulsion composition significantly reduces the effective viscosity.

References

1. Gaydarov M. M-R., Kravtsov S.A., Yusupkhodzhaev M.A., Conservation the

stability of clay rocks by hydrophobic mudding (In Russ.), Gazovaya promyshlennost'

= GAS Industry of Russia, 2007, no. 11, pp. 87-90.

2. Abaturov S.V., Ramazanov D.Sh., Shpurov I.V., About efficiency of gas and

water-gas stimulation of the watered stratum YuK10 of Talinskaya area of Krasnoleninskoye

oil field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2009,

no. 9, pp. 90-91.

3. Bondarenko V.P., Nadirov K.S., Golubev V.G., Sadyrbaeva A.S., Dzhusenov

A.U., Research of properties of hydrophobic and emulsion structures for

muffling of wells, Vestnik Evraziyskogo natsional'nogo universiteta imeni

L.N. Gumileva, 2016, no. 2, pp. 151-156.

4. Kolesnikov A.S., Sadyrbaeva A.S., Shegenova G.K., Amantaeva D.B., Issledovaniya

gliny orangayskogo mestorozhdeniya s tsel'yu sozdaniya na ee osnove

burovogo rastvora (Research of clay of Orangescape deposit in order

to create on its basis the mud), Proceedings of International scientific and

practical conference dedicated to the 60th anniversary USPTU branch in Oktyabrsky

“Sovremennye tekhnologii v neftegazovom dele – 2016” (Modern

technologies in the oil and gas business - 2016), 2016, pp. 446-451.

5. Abramzon A.A., Poverkhnostno-aktivnye veshchestva. Sintez, analiz, svoystva,

primenenie (Surfactants. Synthesis, analysis, properties and application),

St. Petersburg: Khimiya Publ., 2008, 200 p.

6. Nadirov K.S., Bondarenko V.P., Bimbetova G.Zh., Baybotaeva A., Kadyrov

A.A., Preparation the mud component based modified hexahydro resin

(In Russ.), Nauka i obrazovanie Yuzhnogo Kazakhstana, 2012, no. 3/4 (94/95),

pp.122-126.

7. Gaydarov M. M-R., Kurbanov Ya.M., Application of hydrocarbon drilling fluids

at deep holes making (In Russ.), Neftyanoe khozyaystvo = Oil Industry,

2008, no. 4, pp. 41-43.

8. Bondarenko V.P., Nadirov K.S., Golubev V.G., Sadyrbaeva A.S., The research

of aggregate resistance and electrical stability of hydrophobic emulsion solutions

for drilling, Proceedings of International Conference of Indus trial Technologies

and Enginiring (ICITE), Shymkent, October 30-31, 2014, M. Auezov

South Kazakhstan State University, pp. 9-13.

9. Rogachev M.K. et al., Development and selection of water-repellent compositions

at killing of wells at their remedial work (In Russ.), Neftyanoe

khozyaystvo = Oil Industry, 2006, no. 4, pp. 116-118.

10. Basniev K.S., Dmitriev N.M., Rozenberg G.D., Neftegazovaya

gidromekhanika (Oil & Gas Hydromechanics), Moscow - Izhevsk: Publ. of Institute

of Computer Science, 2003, 480 p.

11. Nadirov K.S., Bimbetova G.Zh., Zhantasov M.K., Kolesnikov A.S., Sadyrbaeva

A.S., Orynbasarov A.K., Kutzhanova A.N., Turemuratov R.S., Botabaev N.E.,

Zhantasova D., Examination of optimal parameters of oxy-ethylation of fatty

acids with a view to obtaining demulsifiers for deliquefaction in the system of

skimming and treatment of oil, Chimica Oggi - Chemistry Today, 2016,

V. 34(1), February, pp. 72-77.