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Development of technologies for breaking stable water-in-oil emulsions stabilized by solids

UDK: 622.276.8:665.622.43
DOI: 10.24887/0028-2448-2019-7-52-54
Key words: stable water-in-oil emulsion, solids, iron sulfide, emulsion breaking
Authors: E.I. Akhmetshina (TatNIPIneft, RF, Bugulma), R.Z. Sakhabutdinov (TatNIPIneft, RF, Bugulma), F.R. Gubaidulin (TatNIPIneft, RF, Bugulma), A.N. Sudykin (TatNIPIneft, RF, Bugulma), I.I. Urazov (TatNIPIneft, RF, Bugulma), I.R. Mirgaliev (Oil and Gas Production Department Yamasneft, RF, Almetyevsk)

Efforts were made to develop effective technologies to break stable water-in-oil emulsions stabilized by solid particles. The paper presents the results of the research studies. Based on the laboratory research, a number of technologies have been developed for breaking of stable water-in-oil emulsions and obtaining of on-spec oil with water cut up to 1 %, iron sulfide content up to 200 mg/dm3, and solids content up to 0.1 %wt. The technology of thermochemical treatment involves circulation of stable water-in-oil emulsion in the process loop, heating, diluting, and adding chemical agents. The technology of acid treatment involves circulation of stable water-in-oil emulsion in the process loop, heating, and adding acid. The technology of stage combined treatment combines the technology of thermochemical treatment at stage one, using diluents and chemical agents, and the technology of acid treatment at stage two, using acid.

The technologies of acid treatment and stage combined treatment were tested at the Tatneft PJSC battery. The test was very successful: more than 90% of oil contained in the feed water-in-oil emulsion was recovered. The economics of the process was also attractive. Commercialization of these technologies will allow the Company to cut down expenses related to emulsion disposal services of outside companies; also the volume of additional on-spec oil will be increased.

References

1. Sakhabutdinov R.Z., Gubaydulin F.R., Ismagilov I.Kh., Kosmacheva T.F., Osobennosti formirovaniya i razrusheniya vodoneftyanykh emul'siy na pozdney stadii razrabotki neftyanykh mestorozhdeniy (Features of formation and destruction of oil-water emulsions at a late stage of oil field development), Moscow: Publ. of OAO “VNIIOENG”, 2005, pp. 229–236.

2. Sakhabutdinov R.Z., Gubaydulin F.R., Kosmacheva T.F., Tat'yanina O.S., The causes of water-oil emulsion stability increase (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2007, no. 1, pp. 74–77.

3. Sakhabutdinov R.Z., Kosmacheva T.F., Gubaydulin F.R., Makhmutova G.R., Peculiarities of intermediate layers formation while oil dehydration (In Russ.), Neftepromyslovoe delo, 2009, no. 10, pp. 42–46.

4 Shavaleev. I.I., Sakhabutdinov R.Z., Tronov V.P. et al., Tekhnologiya obrabotki promezhutochnykh sloev iz apparatov podgotovki nefti (Processing technology of the intermediate layers of oil treatment apparatus), Proceedings of scientific and technical conference “Bol'shaya neft': realii, problemy, perspektivy” (Big oil: realities, problems, prospects), Al'met'evsk, 2001, pp. 182–189.

5. Akhmetshina E.I., Gubaydulin F.R., Sudykin S.N., Karavashkina L.S., Razrabotka tekhnologiy razdeleniya promezhutochnykh sloev, obrazuyushchikhsya na ob"ektakh podgotovki nefti PAO “Tatneft'” (Development of technologies for the separation of intermediate layers formed at the oil treatment facilities of Tatneft PJSC), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 258–265.

6. STO TN 234-2017, Instruktsiya po primeneniyu tekhnologiy obrabotki promezhutochnykh sloev (Instructions for the use of technologies for processing intermediate layers), Bugul'ma: Publ. of TatNIPIneft' PAO “Tatneft'”, 2017, 48 p.

7. Patent no. 2671565 RF, MPK C 10 G 33/04, 33/06, Method for processing intermediate layer stabilized by iron sulphide, using inhibited salt acid (options), Inventors: Akhmetshina E.I., Gubaydulin F.R., Sudykin S.N.

8. Patent no. 2678589 RF, MPK C 10 G 33/04, Method of complex processing of an intermediate layer stabilized by iron sulfide, Inventors: Akhmetshina E.I., Gubaydulin F.R., Sudykin S.N., Karavashkina L.S., Urazov I.I., Mirgaliev I.R.

Efforts were made to develop effective technologies to break stable water-in-oil emulsions stabilized by solid particles. The paper presents the results of the research studies. Based on the laboratory research, a number of technologies have been developed for breaking of stable water-in-oil emulsions and obtaining of on-spec oil with water cut up to 1 %, iron sulfide content up to 200 mg/dm3, and solids content up to 0.1 %wt. The technology of thermochemical treatment involves circulation of stable water-in-oil emulsion in the process loop, heating, diluting, and adding chemical agents. The technology of acid treatment involves circulation of stable water-in-oil emulsion in the process loop, heating, and adding acid. The technology of stage combined treatment combines the technology of thermochemical treatment at stage one, using diluents and chemical agents, and the technology of acid treatment at stage two, using acid.

The technologies of acid treatment and stage combined treatment were tested at the Tatneft PJSC battery. The test was very successful: more than 90% of oil contained in the feed water-in-oil emulsion was recovered. The economics of the process was also attractive. Commercialization of these technologies will allow the Company to cut down expenses related to emulsion disposal services of outside companies; also the volume of additional on-spec oil will be increased.

References

1. Sakhabutdinov R.Z., Gubaydulin F.R., Ismagilov I.Kh., Kosmacheva T.F., Osobennosti formirovaniya i razrusheniya vodoneftyanykh emul'siy na pozdney stadii razrabotki neftyanykh mestorozhdeniy (Features of formation and destruction of oil-water emulsions at a late stage of oil field development), Moscow: Publ. of OAO “VNIIOENG”, 2005, pp. 229–236.

2. Sakhabutdinov R.Z., Gubaydulin F.R., Kosmacheva T.F., Tat'yanina O.S., The causes of water-oil emulsion stability increase (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2007, no. 1, pp. 74–77.

3. Sakhabutdinov R.Z., Kosmacheva T.F., Gubaydulin F.R., Makhmutova G.R., Peculiarities of intermediate layers formation while oil dehydration (In Russ.), Neftepromyslovoe delo, 2009, no. 10, pp. 42–46.

4 Shavaleev. I.I., Sakhabutdinov R.Z., Tronov V.P. et al., Tekhnologiya obrabotki promezhutochnykh sloev iz apparatov podgotovki nefti (Processing technology of the intermediate layers of oil treatment apparatus), Proceedings of scientific and technical conference “Bol'shaya neft': realii, problemy, perspektivy” (Big oil: realities, problems, prospects), Al'met'evsk, 2001, pp. 182–189.

5. Akhmetshina E.I., Gubaydulin F.R., Sudykin S.N., Karavashkina L.S., Razrabotka tekhnologiy razdeleniya promezhutochnykh sloev, obrazuyushchikhsya na ob"ektakh podgotovki nefti PAO “Tatneft'” (Development of technologies for the separation of intermediate layers formed at the oil treatment facilities of Tatneft PJSC), Proceedings of TatNIPIneft' / PAO “Tatneft'”, 2018, V. 86, pp. 258–265.

6. STO TN 234-2017, Instruktsiya po primeneniyu tekhnologiy obrabotki promezhutochnykh sloev (Instructions for the use of technologies for processing intermediate layers), Bugul'ma: Publ. of TatNIPIneft' PAO “Tatneft'”, 2017, 48 p.

7. Patent no. 2671565 RF, MPK C 10 G 33/04, 33/06, Method for processing intermediate layer stabilized by iron sulphide, using inhibited salt acid (options), Inventors: Akhmetshina E.I., Gubaydulin F.R., Sudykin S.N.

8. Patent no. 2678589 RF, MPK C 10 G 33/04, Method of complex processing of an intermediate layer stabilized by iron sulfide, Inventors: Akhmetshina E.I., Gubaydulin F.R., Sudykin S.N., Karavashkina L.S., Urazov I.I., Mirgaliev I.R.



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