Special aspects of chemical reagents use under high mineralization of produced waters

UDK: 622.276.72
DOI: 10.24887/0028-2448-2020-9-59-62
Key words: halites, hydrates, inhibitory protection, complicated well stock, scaling
Authors: R.M. Salihov (Irkutsk Oil Company LLC, RF, Irkutsk), E.О. Chertovskih (Irkutsk Oil Company LLC, RF, Irkutsk), B.R. Gilmutdinov (Irkutsk Oil Company LLC, RF, Irkutsk), I.P. Lebedeva (Irkutsk Oil Company LLC, RF, Irkutsk), I.I. Kostyuk (Irkutsk Oil Company LLC, RF, Irkutsk), M.K. Paraschenko (Irkutsk Oil Company LLC, RF, Irkutsk), А.А. Uryadnov (Irkutsk Oil Company LLC, RF, Irkutsk), А.R. Kolesnikova (Irkutsk Oil Company LLC, RF, Irkutsk)

Currently, scaling is the main factor complicating the development of the Yaraktinskoye oil-gas-condensate field. The paper provides general information on types of inorganic scales. Mainly they are halite, gypsum and calcium carbonate. The dynamics of the complicated well stock shows that the operation of most of them was complicated because of halite deposits. The share of production wells with halite scaling is currently 40%. Scaling occurs from the bottomhole formation zone to the wellhead which leads to a decrease in well productivity. The article presents data on the chemical composition of formation natural brines and describes the conditions contributory to scaling. Physicochemical analysis of scales obtained from pumping equipment was conducted. The methods for scales removal from downhole equipment and bottomhole formation zone are considered. It is discussed methods for prevention and technological solutions for dealing with halite deposits in production oil wells, equipped with electric centrifugal pumps, in Yaraktinskoye oil and gas condensate field. It is also described the methods of testing halite inhibitors in a saturated sodium chloride solution, as well as on actual formation water. The morphology of halite crystals before and after treatment with an inhibitor is described. The results of experimental-industrial application of halite inhibitor are given. The inhibitor was selected during the laboratory tests in order to protect downhole equipment in the production oil stock of the Yaraktinskoye oil-gas-condensate field. For inhibitor injection the technology of constant dosing the casing annulus were applied. There was gained good operating and scientific experience of using the inhibitor in wells, the operation of which was complicated by the formation of halite.

References

1. Voloshin A., Ragulin V., Nevyadovsky E., Ganiev I., Technical and economic strategy in the scale deposition management is an important factor in enhancement the efficiency of oil production (In Russ.), SPE 138066-RU, 2010.

2. Chertovskikh E.O., Kachin V.A., Karpikov A.V., Halite sedimentation under oil and gas extraction on Verkhnechonsk oil and gas-condensate field (In Russ.), Vestnik IrGTU, 2013, no. 5 (76), pp. 82–91.

3. Cheremisin A.N., Gorlanov A.A., Romanova D.D. et al., Problems of scaling when producing oil and gas in Yaraktinsky and Danilovsky deposits (In Russ.), Neftepromyslovoe delo, 2017, no. 10, pp. 45–51.

4.  Kashchavtsev V.E., Mishchenko I.T., Soleobrazovanie pri dobyche nefti (Salt formation in oil production), Moscow: Orbita-M Publ., 2004, 432 p.

5. Shablya V.V., Experience of Kogalymneftegas TPP  with salt-forming well stock (In Russ.), Inzhenernaya praktika, 2009, Pilot issue, pp. 24–28.

Currently, scaling is the main factor complicating the development of the Yaraktinskoye oil-gas-condensate field. The paper provides general information on types of inorganic scales. Mainly they are halite, gypsum and calcium carbonate. The dynamics of the complicated well stock shows that the operation of most of them was complicated because of halite deposits. The share of production wells with halite scaling is currently 40%. Scaling occurs from the bottomhole formation zone to the wellhead which leads to a decrease in well productivity. The article presents data on the chemical composition of formation natural brines and describes the conditions contributory to scaling. Physicochemical analysis of scales obtained from pumping equipment was conducted. The methods for scales removal from downhole equipment and bottomhole formation zone are considered. It is discussed methods for prevention and technological solutions for dealing with halite deposits in production oil wells, equipped with electric centrifugal pumps, in Yaraktinskoye oil and gas condensate field. It is also described the methods of testing halite inhibitors in a saturated sodium chloride solution, as well as on actual formation water. The morphology of halite crystals before and after treatment with an inhibitor is described. The results of experimental-industrial application of halite inhibitor are given. The inhibitor was selected during the laboratory tests in order to protect downhole equipment in the production oil stock of the Yaraktinskoye oil-gas-condensate field. For inhibitor injection the technology of constant dosing the casing annulus were applied. There was gained good operating and scientific experience of using the inhibitor in wells, the operation of which was complicated by the formation of halite.

References

1. Voloshin A., Ragulin V., Nevyadovsky E., Ganiev I., Technical and economic strategy in the scale deposition management is an important factor in enhancement the efficiency of oil production (In Russ.), SPE 138066-RU, 2010.

2. Chertovskikh E.O., Kachin V.A., Karpikov A.V., Halite sedimentation under oil and gas extraction on Verkhnechonsk oil and gas-condensate field (In Russ.), Vestnik IrGTU, 2013, no. 5 (76), pp. 82–91.

3. Cheremisin A.N., Gorlanov A.A., Romanova D.D. et al., Problems of scaling when producing oil and gas in Yaraktinsky and Danilovsky deposits (In Russ.), Neftepromyslovoe delo, 2017, no. 10, pp. 45–51.

4.  Kashchavtsev V.E., Mishchenko I.T., Soleobrazovanie pri dobyche nefti (Salt formation in oil production), Moscow: Orbita-M Publ., 2004, 432 p.

5. Shablya V.V., Experience of Kogalymneftegas TPP  with salt-forming well stock (In Russ.), Inzhenernaya praktika, 2009, Pilot issue, pp. 24–28.



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