Abstract

To obtain a high quality of well fastening, it is necessary to regulate the basic properties of cement mortars using various chemical reagents. One of the most interesting reagents in this regard is polyelectrolyte VPK-402, which belongs to the class of cationic polymers.

The results of studies of the VPK-402 and the experience of its application in the fixation of wells showed the effectiveness of this reagent. A disadvantage of this reagent is that it is released only in liquid form. One of the analogues of VPK-402 is powdered cationic polyelectrolyte (PAC), manufactured under the brand name Praestol.

It was shown that when using the PAC reagent in a concentration of 0.1%, the water supply of the solution did not exceed 50 cm3/30 minutes. The mobility of the solutions, both from cement PCT1-50 and cement PCT I-G, with the addition of PAC decreases, therefore, plasticizers are needed, the best results were obtained with ReoTeck. To accelerate the solubility of PAC in water, the possibility of its additional dispersion together with cement in a disintegrator is considered.

The article presents the results of changing the hydrostatic pressure of the cement mortar to a "gas formation", showing that the highest rate of reduction in hydrostatic pressure was observed in non-addition cements, and solutions with polyelectrolytes (VPK-402 and PAC) retained pressure on the formation longer and prevented gas from breaking through the cement mortar, while through solutions from non-collection cements gas breakthrough occurred after 15-45 minutes.

The mechanism of action of polyelectrolytes on cement mortars is that the reagents can inhibit the hydration reaction of C3A in the cement mortar and prevent the growth of the static shear stress of the solution, which causes a drop in the hydrostatic pressure of the cement mortar column, contributing to the gas breakthrough.

Key words:

gas occurrence, waiting for cement hardening, pressure on the formation, structuring of cement mortar, polyelectrolytes, gas blockers

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Authors

F.A. Agzamov, Dr.Sc,, Professor, Oil and Gas Well Drilling Department, Ufa State Petroleum Technological University
1, Kosmonavtov st., Ufa, 450064, Russian Federation
E-mail: faritag@yandex.ru

E.F. Tokunova, Ph.D.,, Associate Professor, Oil and Gas Well Drilling Department, Ufa State Petroleum Technological University
1, Kosmonavtov st., Ufa, 450064, Russian Federation
E-mail: etokunova@yandex.ru

S.F. Komleva, Ph.D.,, Associate Professor, Oil and Gas Well Drilling Department, Ufa State Petroleum Technological University
1, Kosmonavtov st., Ufa, 450064, Russian Federation
E-mail: svet1001@yandex.ru

A.A. Kabdushev, Dr.Sc,, Associate Professor, Oil and Gas Engineering Department, M. Kh. Dulaty Taraz Regional University
7, Sulejmenova st., Taraz, 080012, Republic of Kazakhstan
E-mail: arman-kz@mail.ru

For citation:

F.A. Agzamov, E.F. Tokunova, S.F. Komleva, A.A. Kabdushev Primenenie polijelektrolitnyh reagentov dlja regulirovanija svojstv tamponazhnyh rastvorov [Application of polyelectrolyte reagents for regulation of the properties of grouting solution]. Neftyanaya Provintsiya, No. 4(28), Part 2, 2021. pp. 468-491. DOI https://doi.org/10.25689/NP.2021.4.468-491 (in Russian)