Application of X-ray tomography method for estimation of drilling agents influence on sedimentary rocks in the process of borehole drilling and completion

UDK: 552.12(470.53)
DOI: 10.24887/0028-2448-2020-6-40-44
Key words: X-ray tomography, fracture, porosity, experiments, drilling agents, void space maps
Authors: О.V. Garshina (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm), D.А. Кazakov (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm), I.L. Nekrasova (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm), P.А. Khvoshchin (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm), А.А. Predein (PermNIPIneft Branch of LUKOIL-Engineering LLC in Perm, RF, Perm), К.P. Кazymov (Perm State National Research University, RF, Perm), V.М. Zhdanov (Perm State National Research University, RF, Perm), B.М. Osovetsky (Perm State National Research University, RF, Perm), G.V. Коnesev (Ufa State Petroleum Technological University, RF, Ufa)

The results of experimental studies on the influence of drilling fluids on clay rocks which are unstable in the process of borehole drilling and other drilling agents on the sandy rocks for estimation of the changes in void space of collectors are presented. The experiments are executed with the core samples which are placed in drilling agents and stand there in definite time which give the opportunity to model the real processes of their influence on the rocks with high fracture or porosity. The preliminary estimation of the drilling agents influence on the rock void space is produced on the base of visual comparison of X-ray tomography imaginations of experimental samples before and after the agent influence. The quantitative estimation is carried out with application of the original methods of X-ray tomography data processing, with help of which the size distribution of fissures and pores is calculated, as well as the maps of volume fracture and porosity of samples are constructed. Under modeling the processes for clay covers two drilling fluids are used with different content of mineral salts. As to the influence of drilling agents on porosity space of sandy collector there are successively used drilling fluid, stimulation of afflux, and processing by acid composition. The getting data give the opportunity to produce the proved calculation of microcolmatant fractional composition for drilling fluids, to value its inhibiting properties, and to accept the reliable decisions on the use of acid compositions.

References

1. Abrosimov A.A., Razrabotka metodik opredeleniya fil'tratsionno-emkostnykh svoystv i ostatochnoy vodonasyshchennosti gornykh porod po dannym rentgenovskoy tomografii i chislennogo modelirovaniya (Development of the methodology for definition of filtration and capacity properties and residual water-saturation of rocks with application of X-ray tomography and numerical modeling): thesis of candidate of technical science, Moscow, 2017.

2. Zhukovskaya E.A., Lopushnyak Yu.M., Application of X-ray tomography for investigation of terrigenous and carbonate collectors (In Russ.), Geologiya i geofizika, 2008, no. 1, pp. 25–27.

3. Eremenko N.M., Murav'eva Yu.A., Application of the X-ray microtomography for porosity determination in borehole core (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2012, V. 7, no. 3, pp. 1–12.

4. Nekrasova I.L., Kazymov K.P., Predein A.A. et al., Change of the composition and texture of terrigenious rocks under the influence of drilling fluids (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2017, no. 6, pp. 37–43.

5. Shaldybin M.V., Lopushnyak Yu.M., Filimonov S.Yu., Skripkin A.G., Vozmozhnosti komp'yuternoy tomografii kerna dlya prognoza kollektorskikh svoystv osadochnykh gornykh porod (The opportunities of core X-ray tomography for prognosis of collector properties of sedimentary rocks), In: Osadochnye basseyny, sedimentatsionnye i postsedimentatsionnye protsessy v geologicheskoy istorii (Sedimentary basins: sediment and post-sediment processes in geological history), 2013, V. III, pp. 270–273.

6. Van Geet M., Swennen R., Wevers M., Quantitative analysis of reservoir rocks by microfocus X-ray computerized tomography, Sedimentary Geology, 2000, V. 132, no. 1–2, pp. 25–36.

7. Avetisyan N.G., Vybor tipa burovogo rastvora dlya bureniya v neustoychivykh porodakh (The choice of drilling fluid type for drilling in unstable rocks), Moscow: Publ. of VNIIOENG, 1983, 31 p.

8. Gabuzov G.G., The estimation of influence of drilling fluid properties on stability of clay rocks (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1983, no. 9, pp. 34–36.

9. Ivanov M.K., Burlin Yu.K., Kalmykov G.A. et al., Petrofizicheskie metody issledovaniya kernovogo materiala (Terrigennye otlozheniya) (Petrophisical methods of sore material study (Terrigenous deposits), Moscow: Publ. of MSU, 2008, 112 p.

10. Osipov V.I.,Sokolov V.N., Eremeev V.V., Glinistye pokryshki neftyanykh i gazovykh mestorozhdeniy (Clay covers of oil and gas deposits), Moscow: Nauka Publ., 2001, 238 p.

11. Abrams A., Mud design to minimize rock impairment due to particle invasion, JPT, 1977, no. 6, pp. 586–592.

The results of experimental studies on the influence of drilling fluids on clay rocks which are unstable in the process of borehole drilling and other drilling agents on the sandy rocks for estimation of the changes in void space of collectors are presented. The experiments are executed with the core samples which are placed in drilling agents and stand there in definite time which give the opportunity to model the real processes of their influence on the rocks with high fracture or porosity. The preliminary estimation of the drilling agents influence on the rock void space is produced on the base of visual comparison of X-ray tomography imaginations of experimental samples before and after the agent influence. The quantitative estimation is carried out with application of the original methods of X-ray tomography data processing, with help of which the size distribution of fissures and pores is calculated, as well as the maps of volume fracture and porosity of samples are constructed. Under modeling the processes for clay covers two drilling fluids are used with different content of mineral salts. As to the influence of drilling agents on porosity space of sandy collector there are successively used drilling fluid, stimulation of afflux, and processing by acid composition. The getting data give the opportunity to produce the proved calculation of microcolmatant fractional composition for drilling fluids, to value its inhibiting properties, and to accept the reliable decisions on the use of acid compositions.

References

1. Abrosimov A.A., Razrabotka metodik opredeleniya fil'tratsionno-emkostnykh svoystv i ostatochnoy vodonasyshchennosti gornykh porod po dannym rentgenovskoy tomografii i chislennogo modelirovaniya (Development of the methodology for definition of filtration and capacity properties and residual water-saturation of rocks with application of X-ray tomography and numerical modeling): thesis of candidate of technical science, Moscow, 2017.

2. Zhukovskaya E.A., Lopushnyak Yu.M., Application of X-ray tomography for investigation of terrigenous and carbonate collectors (In Russ.), Geologiya i geofizika, 2008, no. 1, pp. 25–27.

3. Eremenko N.M., Murav'eva Yu.A., Application of the X-ray microtomography for porosity determination in borehole core (In Russ.), Neftegazovaya geologiya. Teoriya i praktika, 2012, V. 7, no. 3, pp. 1–12.

4. Nekrasova I.L., Kazymov K.P., Predein A.A. et al., Change of the composition and texture of terrigenious rocks under the influence of drilling fluids (In Russ.), Geologiya, geofizika i razrabotka neftyanykh i gazovykh mestorozhdeniy, 2017, no. 6, pp. 37–43.

5. Shaldybin M.V., Lopushnyak Yu.M., Filimonov S.Yu., Skripkin A.G., Vozmozhnosti komp'yuternoy tomografii kerna dlya prognoza kollektorskikh svoystv osadochnykh gornykh porod (The opportunities of core X-ray tomography for prognosis of collector properties of sedimentary rocks), In: Osadochnye basseyny, sedimentatsionnye i postsedimentatsionnye protsessy v geologicheskoy istorii (Sedimentary basins: sediment and post-sediment processes in geological history), 2013, V. III, pp. 270–273.

6. Van Geet M., Swennen R., Wevers M., Quantitative analysis of reservoir rocks by microfocus X-ray computerized tomography, Sedimentary Geology, 2000, V. 132, no. 1–2, pp. 25–36.

7. Avetisyan N.G., Vybor tipa burovogo rastvora dlya bureniya v neustoychivykh porodakh (The choice of drilling fluid type for drilling in unstable rocks), Moscow: Publ. of VNIIOENG, 1983, 31 p.

8. Gabuzov G.G., The estimation of influence of drilling fluid properties on stability of clay rocks (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 1983, no. 9, pp. 34–36.

9. Ivanov M.K., Burlin Yu.K., Kalmykov G.A. et al., Petrofizicheskie metody issledovaniya kernovogo materiala (Terrigennye otlozheniya) (Petrophisical methods of sore material study (Terrigenous deposits), Moscow: Publ. of MSU, 2008, 112 p.

10. Osipov V.I.,Sokolov V.N., Eremeev V.V., Glinistye pokryshki neftyanykh i gazovykh mestorozhdeniy (Clay covers of oil and gas deposits), Moscow: Nauka Publ., 2001, 238 p.

11. Abrams A., Mud design to minimize rock impairment due to particle invasion, JPT, 1977, no. 6, pp. 586–592.



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