«Equipment and technologies for oil and gas complex»

Development and implementation of cavitation dispersant mixer when preparing grouting solution for wells’ repair in the deposits of Krasnodar territory

UDC: 622.279.7
DOI: -

Authors:

¹ Kuban State Technological University, Krasnodar, Russia

Keywords: dispersion, homogenization, grouting solution, cavitation, shock waves, micro-jets, strength, cavitation dispersant mixer

Annotation:

The issue of equipping well overhauls with modern technologies for preparing small-volume cementing slurries is becoming increasingly relevant. This is due to the annual increase in the volume of work on abandoned and old production wells in oil and gas fields. Simple mixing of cement with water does not guarantee the required quality of the slurry. It is necessary to implement processes for dispersing and homogenizing the mixture, which ultimately increases the strength of the slurry, reduces water loss, and ensures the long-term and safe operation of wells. Solving this problem involves the development of high-tech devices – dispersers that combine cavitation and vortex effects. The article provides calculations of the maximum dynamic pressure of a microjet on the inner wall of a bubble and the solid surface of an adjoining particle. It also presents the operating principle and technical characteristics of the cavitation disperser-mixer, whose novelty and uniqueness are confirmed by a patent. Pilot-industrial tests of the developed device for processing cementing slurries during cementing and isolation works were conducted in wells in the Krasnodar region. The aim of the tests was to verify the cavitation properties of the device and assess their impact on the strength of the cement stone during cementing operations. During laboratory testing, the water separation of the slurry decreased by 3...5 times, and the average compressive strength of the cement stone increased by 15 %.

Bibliography:

1. Bulatov A.I., Makarenko P.P., Proselkov Yu.M. Burovye promyvochnye i tamponazhnye rastvory. – M.: Nedra, 1999. – 424 s.
2. Proselkov Yu.M., Pakhlyan I.A., Mishchenko S.V. Progressivnye tekhnologicheskie skhemy prigotovleniya tamponazhnykh rastvorov // Oborudovanie i tekhnologii dlya neftegazovogo kompleksa. – 2013. – № 4. – S. 37–46.
3. Sobolev A.S. Tamponazhnye raboty: optimizatsiya oborudovaniya // Burenie i neft'. – 2008. – № 12. – S. 47–48.
4. Patent US 6454457, Int. Cl. B01F 5/04, B01F 5/10. Mixing apparatus with rotary jet water valve / M.J. Banse, P.O. Padgett, C. Sneed; Assignee: Halliburton Energy Services Inc. – Appl. No.: 09/687,556; Filed: Oct. 13, 2000; Date of Patent: Sep. 24, 2002.
5. Plesset M.S., Chapman R.B. Collapse of an initially spherical vapour cavity in the neighbourhood of a solid boundary // J. of Fluid Mechanics. – 1971. – Vol. 47, Issue 2. – P. 283–290. – DOI: 10.1017/s0022112071001058
6. Chahine G.L. Modeling of Cavitation Dynamics and Interaction with Material // Advanced Experimental and Numerical Techniques for Cavitation Erosion Prediction. – Springer, 2014. – P. 123–161. – DOI: 10.1007/978-94-017-8539-6_6
7. Linzheng Ye, Xijing Zhu. Analysis of the effect of impact of near-wall acoustic bubble collapse micro-jet on Al 1060 // Ultrasonics Sonochemistry. – 2017. – Vol. 36. – P. 507–516. – DOI: 10.1016/j.ultsonch.2016.12.030
8. Peters A., Lantermann U., el Moctar O. Numerical Modelling and Prediction of Erosion Induced by Hydrodynamic Cavitation // J. of Physics: Conf. Series. – 2015. – Vol. 656. 9th Int. Symposium on Cavitation (CAV2015), Lausanne, Switzerland, Dec. 6–10, 2015. – DOI: 10.1088/1742-6596/656/1/012054
9. Pat. na polez. model' 116068 Ros. Federatsiya, MPK B01F 5/00. Kavitatsionnyy dispergator-smesitel' / M.V. Omel'yanyuk, I.A. Pakhlyan; patentoobladatel' FGBOU VPO "Kubanskiĭ gos. tekhnolog. un-t". – № 2011143283/05; zayavl. 26.10.2011; opubl. 20.05.2012, Byul. № 14.