New approach in estimation of strengthening compositions effectiveness for solidification of unstable formations during drilling

UDK: 622.245.3
DOI: 10.24887/0028-2448-2022-11-24-27
Key words: strengthening compositions, filtration in low-permeability rocks, stability of mudstones, assessment of reinforcing properties
Authors: D.V. Evdokimov (Samara NIPIneft LLC, RF, Samara), О.V. Nozhkina (Samara NIPIneft LLC, RF, Samara), V.А. Каpitonov (Samara NIPIneft LLC, RF, Samara; Samara State Technical University, RF, Samarа), А.S. Kozyrev (RN-Centre for Peer Review and Technical Development, LLC, RF, Tyumen), N.I. Еrmolaev (RN-Centre for Peer Review and Technical Development, LLC, RF, Tyumen), N.R. Loginovа (Samotlorneftegas JSC, RF, Nizhnevartovsk), D.D. Krepostnov (Rosneft Oil Company, RF, Moscow)

The complexity of processes, which occur during drilling unstable mudstone formations, and absence of proven methods for estimation of drilling fluid filtrate influence on low-permeability rocks give motivation for search of ways to perform such estimation. The volume of drilling fluid filtrate is one of key factors for stability of mudstone formations. Generally, the increase of filtrate volume decreases the time of stable condition for such formations. In order to reduce the impact of this factor the compositions that used in industrial and civilian construction for ground strengthening were examined. Strengthening compositions consist of strengthening component and solidification / activation component. Sodium silicate and different modifications of carbamide resin can be used as a strengthening component. Water solutions of acids and salts can be used as a solidification component.

This article describes a single-solution formation strengthening compositions in which the mixing of strengthening and solidification component is made on the surface and multi-solution compositions which imply the one-by-one transfer of components to the unstable interval. For quantitative estimation of an effect of strengthening solutions was deigned the approach that at first step includes the bridging of ceramic disk with the lowest allowable permeability. The change of ceramic disk permeability allows to quantify the bridging effect of compositions. At second step the estimation of reaction of strengthening compositions and model rock samples which are loaded at 2,5% of the sample strength limit at constant temperature. The method of forming samples from core material allows to achieve good convergence of results. The time from the start of experiment till the crash of sample or its 15% deformation comparing to initial length is the sample stability time. The result of this work can initiate the process of integration of technologies that used in industrial and civilian construction for ground strengthening in oil and gas wells construction process.


1. Kapitonov V.A., Fedosenko O.V., Yurchenko V.V., Considering the factors that affect the stability of argillites (In Russ.), Neft'. Gaz. Novatsii, 2017, no. 10, pp. 22–25.

2. Korolev A.V., Ryabtsev P.L., Mosin V.A. et al., Regulation of drilling mud density while drilling an interval of production casing string in West Siberian fields (In Russ.), Stroitel'stvo neftyanykh i gazovykh skvazhin na sushe i na more, 2013, no. 1, pp. 23–27.

3. Kozhin V.N., Koval' M.E., Evdokimov D.V. et al., Basic approaches to the selection of drilling fluid systems and the technology of their application to prevent complications in the interval of the Koshaisky sediments at the Samotlorsky field (In Russ.), Neftepromyslovoe delo, 2021, no. 9(633), pp. 37–40, DOI 10.33285/0207-2351-2021-9(633)-37-40

4. Nozhkina O.V., Nechaeva O.A., Lelyakov A.D., Identification of factors in qualitative penetration of deposits with the tendency to collapse at the fields of Western Siberia (In Russ.), Neft'. Gaz. Novatsii, 2021, no. 1, pp. 44–47.

5. Bochko E.A., Nikishin V.A., Uprochnenie neustoychivykh gornykh porod pri burenii skvazhin (Hardening of unstable rocks during well drilling), Moscow: Nedra Publ., 1979, 168 p.

6. Iler R., The chemistry of silica: Solubility, polymerization, colloid and surface properties, and biochemistry, N.Y.: Chichester: Wiley-lnterscience Publ., 1979, 866 p.

7. Minibaev V.V., Gryaznov I.V., Konovalov E.A. et al., Elaboration and using experience of silico-gel reagents and drilling fluids (In Russ.), Burenie i neft', 2010, no. 2, pp. 47-48.

8. Li Tszin'yan, Experimental study and application prospect on alkali metal silicate in the process of drilling (In Russ.), Neftegazovoe delo, 2012, no. 3, pp. 81–91.

9. Posobie po khimicheskomu zakrepleniyu gruntov in"ektsiey v promyshlennom i grazhdanskom stroitel'stve (k SNiP 3.02.01-83) (Manual on the chemical fixation of soils by injection in industrial and civil engineering (to SNiP 3.02.01-83)), Moscow: Stroyizdat Publ., 1986, 128 p.

10. Boykov E.V. et al., Razrabotka vosproizvodimoy metodiki odnoosnogo szhatiya iskusstvennykh kernov dlya otsenki ingibiruyushchego deystviya burovykh rastvorov (Development of a reproducible technique for uniaxial compression of artificial cores to assess the inhibitory effect of drilling fluids), Collected papers “Reagenty i materialy dlya stroitel'stva, ekspluatatsii i remonta neftyanykh, gazovykh skvazhin: proizvodstvo, svoystva i opyt primeneniya. Ekologicheskie aspekty neftegazovogo kompleksa” (Reagents and materials for the construction, operation and repair of oil and gas wells: production, properties and application experience. Environmental aspects of the oil and gas complex), Proceedings XX International Scientific and Practical Conference, 7–10 June 2016, Vladimir: Arkaim Publ., 2016.

To buy the complete text of article (a format - PDF) or to read the material which is in open access only the authorized visitors of the website can. .

Mobile applications

Read our magazine on mobile devices

Загрузить в Google play