Optimizing the acidizing operations of horizontal wells in carbonate reservoirs

Authors: G.T. Bulgakova (Ufa State Aviation University, RF, Ufa), R.Ya. Kharisov, A.R. Sharifullin (RN-UfaNIPIneft, RF, Ufa), A.V. Pestrikov (Rosneft Oil Company OJSC, RF, Moscow)
Key words: horizontal well, carbonate reservoirs, interval acid treatment, mathematical model
The objective of the paper is to develop a mathematical model of acid treatment of horizontal wells in carbonate reservoirs to control the distribution flows of acid solutions and chemical diverters. The model presented in the paper has been constructed for an openhole well. Treatment is performed by pumping treatment fluids under pressure through coiled tubing (CT). The model assumes a radially symmetric initial profile of permeability. The mathematical model predicts the location of the injected fluids by tracking the advance of the fronts. Mathematical simulation enables one to solve the problem of determining the optimal positioning of the CT end to uniformly cover the whole treatment interval. In the course of a computational experiment the parameters are studied which influence the improvement of permeability and porosity of the borehole environment. Also determined are their optimal values to ensure maximal efficiency of acid treatments of horizontal wells in carbonate reservoirs.

References

1. Butler R.M., Horizontal wells for the recovery of oil, gas and bitumen,

Petroleum Society of the Canadian Institute of Mining,

Metallurgy and Petroleum, 1994, 228 p.

2. Suchkov B.M., Gorizontal'nye skvazhiny (Horizontal wells),

Moscow – Izhevsk, RKhD Publ., 2006, 422 p.

3. Economides, M.J., Naceu, K.B., Klem, R.C., Matrix stimulation

method for horizontal wells, JPT, July 1991, pp. 854-860.

4. Liu Hai, Coston C., Yassin M., Uddin Sh., Al-Dhafeeri F., A novel

stimulation technique for horizontal openhole wells in carbonate

reservoirs—a case study in Kuwait, SPE 105127, 2010.

5. Al-Dhufairi M., Al-Ghamdi S., Noya V., Al-Aradi Kh., Al-Sarakbi

S., Al-Dossary A., Krueger E., Moore B., Merging tapered in

Coiled Tubing (CT) and well tractor technologies to effectively stimulate extended

reach open hole horizontal wells, SPE 130642, 2011.

6. Patent no. 2082880 RF, Method of acid treatment of oil formation, Inventors:

Orlov G.A.; Muslimov R.Kh.; Yusupov I.G.; Musabirov M.Kh., 1997.

7. Kharisov R.Ya. , Bulgakova G.T. , Sharifullin A.R., Makatrov A.K., Telin A.G.,

Pestrikov A.V., Geologiya, geofizika i razrabotka neftyanykh i gazovykh

mestorozhdeniy, 2010, no. 7, pp. 44–50.

8. Sorbie K.S., Scaled miscible floods in layered beadpacks investigating viscous

crossflow, SPE 20520, 1990.

9. Frick T.R., Economides M.J., Horizontal well damage characterization and

removal, SPE Production and Facilities, February 1993.

10. Bulgakova G.T., Kharisov R.Ya., Sharifullin A.R., Pestrikov A.V., Nauchnotekhnicheskiy

vestnik OAO “Rosneft'”, 2010, no. 2, pp. 16–20.

11. Bulgakova G.T., Kharisov R.Ya., Sharifullin A.R., Pestrikov A.V., Territoriya

NEFTEGAZ, 2010, no. 11, pp. 18–22.

12. Idel'chik I.E., Spravochnik po gidravlicheskim soprotivleniyam (Handbook

on hydraulic resistance), Moscow: Mashinostroenie Publ., 1992, 672 р.

13. Patankar S.V., Numerical Heat Transfer and Fluid Flow, Hemisphere Publ.

Co., 1980.

Key words: horizontal well, carbonate reservoirs, interval acid treatment, mathematical model
The objective of the paper is to develop a mathematical model of acid treatment of horizontal wells in carbonate reservoirs to control the distribution flows of acid solutions and chemical diverters. The model presented in the paper has been constructed for an openhole well. Treatment is performed by pumping treatment fluids under pressure through coiled tubing (CT). The model assumes a radially symmetric initial profile of permeability. The mathematical model predicts the location of the injected fluids by tracking the advance of the fronts. Mathematical simulation enables one to solve the problem of determining the optimal positioning of the CT end to uniformly cover the whole treatment interval. In the course of a computational experiment the parameters are studied which influence the improvement of permeability and porosity of the borehole environment. Also determined are their optimal values to ensure maximal efficiency of acid treatments of horizontal wells in carbonate reservoirs.

References

1. Butler R.M., Horizontal wells for the recovery of oil, gas and bitumen,

Petroleum Society of the Canadian Institute of Mining,

Metallurgy and Petroleum, 1994, 228 p.

2. Suchkov B.M., Gorizontal'nye skvazhiny (Horizontal wells),

Moscow – Izhevsk, RKhD Publ., 2006, 422 p.

3. Economides, M.J., Naceu, K.B., Klem, R.C., Matrix stimulation

method for horizontal wells, JPT, July 1991, pp. 854-860.

4. Liu Hai, Coston C., Yassin M., Uddin Sh., Al-Dhafeeri F., A novel

stimulation technique for horizontal openhole wells in carbonate

reservoirs—a case study in Kuwait, SPE 105127, 2010.

5. Al-Dhufairi M., Al-Ghamdi S., Noya V., Al-Aradi Kh., Al-Sarakbi

S., Al-Dossary A., Krueger E., Moore B., Merging tapered in

Coiled Tubing (CT) and well tractor technologies to effectively stimulate extended

reach open hole horizontal wells, SPE 130642, 2011.

6. Patent no. 2082880 RF, Method of acid treatment of oil formation, Inventors:

Orlov G.A.; Muslimov R.Kh.; Yusupov I.G.; Musabirov M.Kh., 1997.

7. Kharisov R.Ya. , Bulgakova G.T. , Sharifullin A.R., Makatrov A.K., Telin A.G.,

Pestrikov A.V., Geologiya, geofizika i razrabotka neftyanykh i gazovykh

mestorozhdeniy, 2010, no. 7, pp. 44–50.

8. Sorbie K.S., Scaled miscible floods in layered beadpacks investigating viscous

crossflow, SPE 20520, 1990.

9. Frick T.R., Economides M.J., Horizontal well damage characterization and

removal, SPE Production and Facilities, February 1993.

10. Bulgakova G.T., Kharisov R.Ya., Sharifullin A.R., Pestrikov A.V., Nauchnotekhnicheskiy

vestnik OAO “Rosneft'”, 2010, no. 2, pp. 16–20.

11. Bulgakova G.T., Kharisov R.Ya., Sharifullin A.R., Pestrikov A.V., Territoriya

NEFTEGAZ, 2010, no. 11, pp. 18–22.

12. Idel'chik I.E., Spravochnik po gidravlicheskim soprotivleniyam (Handbook

on hydraulic resistance), Moscow: Mashinostroenie Publ., 1992, 672 р.

13. Patankar S.V., Numerical Heat Transfer and Fluid Flow, Hemisphere Publ.

Co., 1980.



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