Peculiarities in selection of well-killng fluids composition for difficult conditions

UDK: 622.276.7
Key words: well-killing fluids, carbonate rocks, acid treatment, inverted emulsion, reservoir properties
Authors: Yu.V. Zeygman, V.Sh. Mukhametshin, A.R. Khafizov, S.B. Kharina, E.M. Abutalipova, A.N. Avrenyuk (Ufa State Petroleum Technological University, RF, Ufa)

Studies show that the most effective for deep delivery into the formation of sulfamic acid is the use of stabilized artificial emulsifiers inverse emulsions acid (OER). OER is maintained for a certain time in the acid as the dispersed phase and prevent its entry into the reaction. The result is to be transported to bottom active acid and its penetration into remote areas of the formation. As shown by the results of studies feature of OER is a much smaller dispersion of the globules of sulfamic acid, which helps to improve the uniform admission OER both low and high permeability in porous-fractured rock.

 It proposed to develop oil emulsion formulations (IRC) used in the primary and secondary opening of layers, well-killing operations, treatments of bottomhole formation zone, and in the processes of enhancing oil recovery. We present the results of the research of oil emulsions (NCE) for delivery of reactive acid into the formation. We determined weight loss of sieved and crushed rock deposit of core (Kuyumbinskoye field) when interacting with aqueous solutions of 15% hydrochloric and sulfamic acid at a temperature of 25 ° C. The content of dolomite samples – 99%.Results of studies using filtration acidic solutions show that the maximum increase in permeability of rock samples occurs after filtration through cores about five pore volumes. A further increase in the multiplicity of pumping acid solutions practically does not change the value of the permeability of the samples in the water. Analysis of physical-chemical properties of the test compounds IRC allows us to recommend their use in the hydraulic fracturing of oil reservoirs dedicated to the Riphean deposits.

References

1. Yagafarov A.K., Kleshchenko I.I., Zeygman Yu.V. et al., Razrabotka

neftyanykh i gazovykh mestorozhdeniy (Oil and gas fields development), Tyumen':

Publ. of TSOGU, 2010, 396 p.

2. Ryabokon' S.A., Tekhnologicheskie zhidkosti dlya zakanchivaniya i remonta

skvazhin (Process fluids for completion and workover), Krasnodar: Burenie

Publ., 2009, 337 p.

3. Zeygman Yu.V., Neftegazovoe delo (Oil and gas business), Part 3: Dobycha

nefti i gaza (Oil and gas recovery): edited by Shammazov A.M., St. Petersburg:

Nedra Publ., 2011, 285 p.

4. Umetbaev V.G., Geologo-tekhnicheskie meropriyatiya pri ekspluatatsii

skvazhin: spravochnik rabochego (Geological and technical measures in

the operation of wells), Moscow: Nedra Publ., 1989, 215 p.

5. Basarygin Yu.M., Budnikov V.F., Bulatov A.I., Teoriya i praktika preduprezhdeniya

oslozhneniy i remonta skvazhin pri ikh stroitel'stve i ekspluatatsii (Theory

and practice of prevention of complications and workover of wells during

their construction and operation), Part 5, Moscow: Nedra-Biznestsentr Publ.,

2003, 399 p.

6. Orlov G.A., Kendis M.Sh., Glushchenko V.N., Primenenie obratnykh emul'siy

v neftedobyche (The use of inverse emulsions in oil extraction), Moscow:

Nedra Publ., 1991, 224 p.

7. Mukhametshin V.Sh., Andreev A.V., Akhmetov R.T., Increase of resourse

base usage efficiency in hard removable oil fields (In Russ.), Neftegazovoe

delo, 2015, V. 13, no. 4, pp. 122–125.

8. Ibragimov N.G., Khafizov A.R., Shaydakov V.V. et al., Oslozhneniya v neftedobyche

(Complications in oil extraction): edited by Ibragimov N.G.,

Ishemguzhin E.I., Ufa: Monografiya Publ., 2003, 302 p.

9. Mukhametshin V.Sh., Popov A.M., Goncharov A.M., Field justification the selection

of wells and exposure settings during hydrochloride acid treatment (In

Russ.), Neftyanoe khozyaystvo = Oil Industry, 1991, no. 6, pp. 32–33.

10. Khafizov A.R., Chizhov A.P., Chibisov A.V. et al., Complex technologies of

influence on gravely extracted and residual stocks of oil (In Russ.), Neftegazovoe

delo, 2011, no. 3, pp. 40–44.

Studies show that the most effective for deep delivery into the formation of sulfamic acid is the use of stabilized artificial emulsifiers inverse emulsions acid (OER). OER is maintained for a certain time in the acid as the dispersed phase and prevent its entry into the reaction. The result is to be transported to bottom active acid and its penetration into remote areas of the formation. As shown by the results of studies feature of OER is a much smaller dispersion of the globules of sulfamic acid, which helps to improve the uniform admission OER both low and high permeability in porous-fractured rock.

 It proposed to develop oil emulsion formulations (IRC) used in the primary and secondary opening of layers, well-killing operations, treatments of bottomhole formation zone, and in the processes of enhancing oil recovery. We present the results of the research of oil emulsions (NCE) for delivery of reactive acid into the formation. We determined weight loss of sieved and crushed rock deposit of core (Kuyumbinskoye field) when interacting with aqueous solutions of 15% hydrochloric and sulfamic acid at a temperature of 25 ° C. The content of dolomite samples – 99%.Results of studies using filtration acidic solutions show that the maximum increase in permeability of rock samples occurs after filtration through cores about five pore volumes. A further increase in the multiplicity of pumping acid solutions practically does not change the value of the permeability of the samples in the water. Analysis of physical-chemical properties of the test compounds IRC allows us to recommend their use in the hydraulic fracturing of oil reservoirs dedicated to the Riphean deposits.

References

1. Yagafarov A.K., Kleshchenko I.I., Zeygman Yu.V. et al., Razrabotka

neftyanykh i gazovykh mestorozhdeniy (Oil and gas fields development), Tyumen':

Publ. of TSOGU, 2010, 396 p.

2. Ryabokon' S.A., Tekhnologicheskie zhidkosti dlya zakanchivaniya i remonta

skvazhin (Process fluids for completion and workover), Krasnodar: Burenie

Publ., 2009, 337 p.

3. Zeygman Yu.V., Neftegazovoe delo (Oil and gas business), Part 3: Dobycha

nefti i gaza (Oil and gas recovery): edited by Shammazov A.M., St. Petersburg:

Nedra Publ., 2011, 285 p.

4. Umetbaev V.G., Geologo-tekhnicheskie meropriyatiya pri ekspluatatsii

skvazhin: spravochnik rabochego (Geological and technical measures in

the operation of wells), Moscow: Nedra Publ., 1989, 215 p.

5. Basarygin Yu.M., Budnikov V.F., Bulatov A.I., Teoriya i praktika preduprezhdeniya

oslozhneniy i remonta skvazhin pri ikh stroitel'stve i ekspluatatsii (Theory

and practice of prevention of complications and workover of wells during

their construction and operation), Part 5, Moscow: Nedra-Biznestsentr Publ.,

2003, 399 p.

6. Orlov G.A., Kendis M.Sh., Glushchenko V.N., Primenenie obratnykh emul'siy

v neftedobyche (The use of inverse emulsions in oil extraction), Moscow:

Nedra Publ., 1991, 224 p.

7. Mukhametshin V.Sh., Andreev A.V., Akhmetov R.T., Increase of resourse

base usage efficiency in hard removable oil fields (In Russ.), Neftegazovoe

delo, 2015, V. 13, no. 4, pp. 122–125.

8. Ibragimov N.G., Khafizov A.R., Shaydakov V.V. et al., Oslozhneniya v neftedobyche

(Complications in oil extraction): edited by Ibragimov N.G.,

Ishemguzhin E.I., Ufa: Monografiya Publ., 2003, 302 p.

9. Mukhametshin V.Sh., Popov A.M., Goncharov A.M., Field justification the selection

of wells and exposure settings during hydrochloride acid treatment (In

Russ.), Neftyanoe khozyaystvo = Oil Industry, 1991, no. 6, pp. 32–33.

10. Khafizov A.R., Chizhov A.P., Chibisov A.V. et al., Complex technologies of

influence on gravely extracted and residual stocks of oil (In Russ.), Neftegazovoe

delo, 2011, no. 3, pp. 40–44.



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