WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRS
Link for citation: Sentemov A.A., Dorfman M.B. Well-killing fluid influence on decline of permeability during well completion in carbonate reservoirs. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 6, рр.35-46. In Rus. Relevance. Carrying out repair oper...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | Russian |
| Published: |
Tomsk Polytechnic University
2023-06-01
|
| Series: | Известия Томского политехнического университета: Инжиниринг георесурсов |
| Subjects: | |
| Online Access: | http://izvestiya-tpu.ru/archive/article/view/4067 |
| _version_ | 1797787376575053824 |
|---|---|
| author | Andrey A. Sentemov Mikhail B. Dorfman |
| author_facet | Andrey A. Sentemov Mikhail B. Dorfman |
| author_sort | Andrey A. Sentemov |
| collection | DOAJ |
| description |
Link for citation: Sentemov A.A., Dorfman M.B. Well-killing fluid influence on decline of permeability during well completion in carbonate reservoirs. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 6, рр.35-46. In Rus.
Relevance. Carrying out repair operations in production and injection wells with improperly selected well-killing fluid can lead to significant decrease in the permeability of the bottomhole formation zone. The important problem of well operations is the preservation of reservoir filtration properties. The main aim of this work is to study the effect of various additives in the well-killing fluid compositions on the reservoir properties and to identify approaches to prevent complications during workover and well servicing. Methods: empirical and analytical methods. Under laboratory conditions, the chemical composition, optical density and light transmission coefficient of well-killing fluids and formation water were determined. Modeling of formation fluids filtration was performed on a core study unit. Results. The main bottomhole zone permeability decrease reason during well-killing operations in the Timan-Pechora oil and gas province is the high iron ions content in formation waters. Formation waters of the Famennian horizon contain 60–70 mg/l of iron. To solve the problem of bottomhole zone filtration characteristics decline, it is necessary to significantly reduce the iron content in the well-killing fluids or prevent precipitation of iron compounds. Analysis of the solutions optical density results show effectiveness of the oxyethylene diphosphonic acid and AKSIS-KS for clarification and stabilization of well-killing fluids with the content of hydrated iron ions up to 70 mg/l. Based on the conducted filtration experiments, in order to reduce the negative effect of iron compounds on the permeability, it is recommend the use an iron stabilizer oxyethylene diphosphonic acid 2,0 % (with an iron ion content up to 70 mg/l) and a hydrophobiser Neftenol-K 1 %.
|
| first_indexed | 2024-03-13T01:21:02Z |
| format | Article |
| id | doaj.art-149eba7d20fa49169021bf16631b8432 |
| institution | Directory Open Access Journal |
| issn | 2500-1019 2413-1830 |
| language | Russian |
| last_indexed | 2024-03-13T01:21:02Z |
| publishDate | 2023-06-01 |
| publisher | Tomsk Polytechnic University |
| record_format | Article |
| series | Известия Томского политехнического университета: Инжиниринг георесурсов |
| spelling | doaj.art-149eba7d20fa49169021bf16631b84322023-07-04T21:17:38ZrusTomsk Polytechnic UniversityИзвестия Томского политехнического университета: Инжиниринг георесурсов2500-10192413-18302023-06-01334610.18799/24131830/2023/6/4067WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRSAndrey A. SentemovMikhail B. Dorfman Link for citation: Sentemov A.A., Dorfman M.B. Well-killing fluid influence on decline of permeability during well completion in carbonate reservoirs. Bulletin of the Tomsk Polytechnic University. Geo Аssets Engineering, 2023, vol. 334, no. 6, рр.35-46. In Rus. Relevance. Carrying out repair operations in production and injection wells with improperly selected well-killing fluid can lead to significant decrease in the permeability of the bottomhole formation zone. The important problem of well operations is the preservation of reservoir filtration properties. The main aim of this work is to study the effect of various additives in the well-killing fluid compositions on the reservoir properties and to identify approaches to prevent complications during workover and well servicing. Methods: empirical and analytical methods. Under laboratory conditions, the chemical composition, optical density and light transmission coefficient of well-killing fluids and formation water were determined. Modeling of formation fluids filtration was performed on a core study unit. Results. The main bottomhole zone permeability decrease reason during well-killing operations in the Timan-Pechora oil and gas province is the high iron ions content in formation waters. Formation waters of the Famennian horizon contain 60–70 mg/l of iron. To solve the problem of bottomhole zone filtration characteristics decline, it is necessary to significantly reduce the iron content in the well-killing fluids or prevent precipitation of iron compounds. Analysis of the solutions optical density results show effectiveness of the oxyethylene diphosphonic acid and AKSIS-KS for clarification and stabilization of well-killing fluids with the content of hydrated iron ions up to 70 mg/l. Based on the conducted filtration experiments, in order to reduce the negative effect of iron compounds on the permeability, it is recommend the use an iron stabilizer oxyethylene diphosphonic acid 2,0 % (with an iron ion content up to 70 mg/l) and a hydrophobiser Neftenol-K 1 %. http://izvestiya-tpu.ru/archive/article/view/4067Well-killing fluidpermeabilitybottomhole formation zonecarbonate reservoirsiron compounds |
| spellingShingle | Andrey A. Sentemov Mikhail B. Dorfman WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRS Известия Томского политехнического университета: Инжиниринг георесурсов Well-killing fluid permeability bottomhole formation zone carbonate reservoirs iron compounds |
| title | WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRS |
| title_full | WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRS |
| title_fullStr | WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRS |
| title_full_unstemmed | WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRS |
| title_short | WELL-KILLING FLUID INFLUENCE ON DECLINE OF PERMEABILITY DURING WELL COMPLETION IN CARBONATE RESERVOIRS |
| title_sort | well killing fluid influence on decline of permeability during well completion in carbonate reservoirs |
| topic | Well-killing fluid permeability bottomhole formation zone carbonate reservoirs iron compounds |
| url | http://izvestiya-tpu.ru/archive/article/view/4067 |
| work_keys_str_mv | AT andreyasentemov wellkillingfluidinfluenceondeclineofpermeabilityduringwellcompletionincarbonatereservoirs AT mikhailbdorfman wellkillingfluidinfluenceondeclineofpermeabilityduringwellcompletionincarbonatereservoirs |