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The study of the drilling mud fluid loss reducing agents based on carboxymethyl starch and cellulose

UDK: 622.244.442
DOI: 10.24887/0028-2448-2017-11-102-105
Key words: carboxymethyl starch, carboxymethyl cellulose, drilling mud, fluid loss reducing agent
Authors: R.R. Sagitov, K.M. Minaev, A.S. Zakharov, A.S. Korolev (Tomsk Polytechnic University, RF, Tomsk), D.O. Minaeva (Tomsk State University, RF, Tomsk)

Low-viscosity carboxymethyl cellulose (CMC) and low-viscosity polyanionic cellulose (PAC) are commonly added to modern drilling mud compositions as fluid loss reducing agents. Currently, starch-based reagents are not widely used due to their high biodegradation (биодеградии) and low heat resistance. However, when carboxymethyl is added to starch, its bacterial and thermal resistance increases. Therefore, taking into consideration the fact that the cost of carboxymethyl starches (CMC) is 30-50% lower than and low-viscosity polyanionic cellulose (PAC), the most crucial goal of the research is to understand if it is possible to substitute PAC for CMC in some types of the drilling muds. However, in our research is it shown that in order to get some comparable properties of the various systems of the drilling muds, it is necessary to keep the content of the active and inert solid phases at a certain level. It is not possible to adequately substitute PAC for CMC when solid phase is in the low content. However, it is common knowledge that the content of the active and inert solid phase in the drilling mud composition is higher than it is minimally required in order to obtain equal properties when CMC is used instead of PAC. Also, the production-scale CMC, which degree of substitution in carboxymethyl is about 30, does not have sufficient thermo- and salt resistance. Moreover, they are subjected to the quick biodegradation in the fresh system (пресная система). That is why the samples of reagents with the degree substitution more than 60 were synthesized. The properties of CMC when it is used as fluid loss reducing agent have comparable filtration drilling mud properties to the mud compositions under study, therefore, they can be recommended to be used in the drilling muds instead of PAC.

References

1. Belenko E.V., Research into biodestruction processes of polysaccharide agents (In Russ.), Zashchita okruzhayushchey sredy v neftegazovom komplekse, 2007, no. 8, pp. 32–36.

2. Rogovin Z.A., Khimiya tsellyulozy (Chemistry of cellulose), Moscow: Khimiya Publ., 1972, 520 p.

3. Caenn R., Darley H.C.H., Gray G.R., Composition and properties of drilling and completion fluids, Gulf Professional Publishing, 2016, 748 r.

4. Koshelev V.N., Nauchnye i metodicheskie osnovy razrabotki i realizatsii tekhnologii kachestvennogo vskrytiya produktivnykh plastov v razlichnykh geologo-tekhnicheskikh usloviyakh (Scientific and methodological foundations for the development and implementation of technology for the qualitative drilling-in in various geological and technical conditions): thesis of candidate of technical science, Krasnodar, 2004.

5. Anisimov A.V., Lodina I.V., Comparison of the properties of starch reagents in a system of mineralized drilling mud (In Russ.), Neft'. Gaz. Novatsii, 2014, no. 9, pp. 43–47.

6. Navard P., The European polysaccharide network of excellence (EPNOE), Springer-Verlag, 2012, 407 p.

7. Richardson S., Gorton L., Characterization of the substituent distribution in starch and cellulose derivatives, Analytica Chimica Acta, 2003, V. 497, pp. 27–65.

8. Sagitov R.R., Minaev K.M., Zakharov A.S., Sravnitel'noe issledovanie ponizitelya fil'tratsii na osnove karboksimetilirovannogo krakhmala i tsellyulozy (A comparative study of a filtering agent based on carboxymethylated starch and cellulose), Collected papers “Burenie v oslozhnennykh usloviyakh” (Drilling in complicated conditions), Proceedings of International Scientific and Practical Conference, St. Petersburg: LEMA Publ., 2016, pp. 90–94.

9. BeMiller R., Whistler starch: Chemistry and technology, Elsevier, 2002, 900 p.

10. Shirokov V.A., Issledovanie i razrabotka modifikatsii polisakharidnykh reagentov dlya povysheniya kachestva promyvochnykh zhidkostey pri stroitel'stve neftyanykh i gazovykh skvazhin (Research and development of modification of polysaccharide reagents to improve the quality of drilling fluid for oil and gas wells): thesis of candidate of technical science, Krasnodar, 2010.

11. Minaev K.M., Martynova D.O., Zakharov A.S. et al., Synthesis of Carboxymethyl Starch for increasing drilling mud quality in drilling oil and gas wells, IOP Conf. Ser. Earth Environ, 2016, V. 43, pp. 1–7.

Low-viscosity carboxymethyl cellulose (CMC) and low-viscosity polyanionic cellulose (PAC) are commonly added to modern drilling mud compositions as fluid loss reducing agents. Currently, starch-based reagents are not widely used due to their high biodegradation (биодеградии) and low heat resistance. However, when carboxymethyl is added to starch, its bacterial and thermal resistance increases. Therefore, taking into consideration the fact that the cost of carboxymethyl starches (CMC) is 30-50% lower than and low-viscosity polyanionic cellulose (PAC), the most crucial goal of the research is to understand if it is possible to substitute PAC for CMC in some types of the drilling muds. However, in our research is it shown that in order to get some comparable properties of the various systems of the drilling muds, it is necessary to keep the content of the active and inert solid phases at a certain level. It is not possible to adequately substitute PAC for CMC when solid phase is in the low content. However, it is common knowledge that the content of the active and inert solid phase in the drilling mud composition is higher than it is minimally required in order to obtain equal properties when CMC is used instead of PAC. Also, the production-scale CMC, which degree of substitution in carboxymethyl is about 30, does not have sufficient thermo- and salt resistance. Moreover, they are subjected to the quick biodegradation in the fresh system (пресная система). That is why the samples of reagents with the degree substitution more than 60 were synthesized. The properties of CMC when it is used as fluid loss reducing agent have comparable filtration drilling mud properties to the mud compositions under study, therefore, they can be recommended to be used in the drilling muds instead of PAC.

References

1. Belenko E.V., Research into biodestruction processes of polysaccharide agents (In Russ.), Zashchita okruzhayushchey sredy v neftegazovom komplekse, 2007, no. 8, pp. 32–36.

2. Rogovin Z.A., Khimiya tsellyulozy (Chemistry of cellulose), Moscow: Khimiya Publ., 1972, 520 p.

3. Caenn R., Darley H.C.H., Gray G.R., Composition and properties of drilling and completion fluids, Gulf Professional Publishing, 2016, 748 r.

4. Koshelev V.N., Nauchnye i metodicheskie osnovy razrabotki i realizatsii tekhnologii kachestvennogo vskrytiya produktivnykh plastov v razlichnykh geologo-tekhnicheskikh usloviyakh (Scientific and methodological foundations for the development and implementation of technology for the qualitative drilling-in in various geological and technical conditions): thesis of candidate of technical science, Krasnodar, 2004.

5. Anisimov A.V., Lodina I.V., Comparison of the properties of starch reagents in a system of mineralized drilling mud (In Russ.), Neft'. Gaz. Novatsii, 2014, no. 9, pp. 43–47.

6. Navard P., The European polysaccharide network of excellence (EPNOE), Springer-Verlag, 2012, 407 p.

7. Richardson S., Gorton L., Characterization of the substituent distribution in starch and cellulose derivatives, Analytica Chimica Acta, 2003, V. 497, pp. 27–65.

8. Sagitov R.R., Minaev K.M., Zakharov A.S., Sravnitel'noe issledovanie ponizitelya fil'tratsii na osnove karboksimetilirovannogo krakhmala i tsellyulozy (A comparative study of a filtering agent based on carboxymethylated starch and cellulose), Collected papers “Burenie v oslozhnennykh usloviyakh” (Drilling in complicated conditions), Proceedings of International Scientific and Practical Conference, St. Petersburg: LEMA Publ., 2016, pp. 90–94.

9. BeMiller R., Whistler starch: Chemistry and technology, Elsevier, 2002, 900 p.

10. Shirokov V.A., Issledovanie i razrabotka modifikatsii polisakharidnykh reagentov dlya povysheniya kachestva promyvochnykh zhidkostey pri stroitel'stve neftyanykh i gazovykh skvazhin (Research and development of modification of polysaccharide reagents to improve the quality of drilling fluid for oil and gas wells): thesis of candidate of technical science, Krasnodar, 2010.

11. Minaev K.M., Martynova D.O., Zakharov A.S. et al., Synthesis of Carboxymethyl Starch for increasing drilling mud quality in drilling oil and gas wells, IOP Conf. Ser. Earth Environ, 2016, V. 43, pp. 1–7.


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