SU1218090A1 - Method of determining salt deposition in oil well - Google Patents
Method of determining salt deposition in oil well Download PDFInfo
- Publication number
- SU1218090A1 SU1218090A1 SU843782089A SU3782089A SU1218090A1 SU 1218090 A1 SU1218090 A1 SU 1218090A1 SU 843782089 A SU843782089 A SU 843782089A SU 3782089 A SU3782089 A SU 3782089A SU 1218090 A1 SU1218090 A1 SU 1218090A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- oil well
- buffer pressure
- determining
- deposition
- salt deposition
- Prior art date
Links
- 230000008021 deposition Effects 0.000 title claims description 6
- 238000000034 method Methods 0.000 title claims description 6
- 150000003839 salts Chemical class 0.000 title claims description 5
- 239000003129 oil well Substances 0.000 title claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-M Bicarbonate Chemical compound OC([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-M 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000005323 carbonate salts Chemical class 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Description
Изобретение относитс к добыче нефти, в частности к исследованию насосно-ком- прессорных труб (НКТ) при эксплуатации нефт ных скважин.The invention relates to the production of oil, in particular to the study of pump-compressor pipes (NCP) in the operation of oil wells.
Целью изобретени вл етс повышение точности определени отложени солей в скважине.The aim of the invention is to improve the accuracy of determining the deposition of salts in the well.
Сущность способа заключаетс в следую- ш,ем.The essence of the method is as follows.
В пробах попутно добываемых вод измер ют величину рН и концентрацию соле- образующих ионов и рассчитывают показатель стабильности (ПС), который характеризует способность воды к осадкообразованию:In samples of produced water, the pH value and the concentration of salt-forming ions are measured, and the stability index (PS) is calculated, which characterizes the ability of water to precipitate:
ПС рН -рСаPS pH rca
2f2f
рНСОз - К,rnsoz - K,
где рН, рСа, рНСОз - отрицательные логарифмы концентрации ионов водорода , кальци и гид рокарбоната; К - функи,и температуры и ионной силы раствора (определ етс по номограмме ) .where pH, pCa, pHCO3 are the negative logarithms of the concentration of hydrogen, calcium and bicarbonate ions; K - functions, and temperature and ionic strength of the solution (determined by nomogram).
Если , то система стабильна; при вода способна продуцировать карбонатные соли; при вода недонасыщена по карбонату кальци .If, then the system is stable; when water is able to produce carbonate salts; when water is undersaturated in calcium carbonate.
С целью вы влени скважин с наиболее интенсивным процессом солеотложени одновременно с отбором проб провод т измерение буферного давлени на устье скважины,In order to identify wells with the most intensive scaling process, at the same time as sampling, the buffer pressure at the wellhead is measured,
г о наличии отложени солей в скважине и интенсивности процесса суд т по величине буферного давлени и значению показател стабильности. Буферное давление характеризует напор жидкости, создаваемый электроцентробежным насосом, так как производи 0 тельность дл каждого электроцентробежного насоса величина посто нна , то увеличение буферного давлени на устье скважины может произойти только по причине уменьшени проходного сечени насосно- компрессорных труб в результате отложени солей. Нормальна рабоча величина буферного давлени при механизированном способе добычи (в частности, ЭЦН) и использовании в системе нефтесбора дожимных насосных станций 1 -1,5 МПа.The presence of salt deposition in the well and the intensity of the process is judged by the magnitude of the buffer pressure and the value of the stability indicator. Buffer pressure characterizes the liquid head generated by an electric centrifugal pump, since the production rate for each electric centrifugal pump is constant, the increase in buffer pressure at the wellhead can occur only due to a decrease in the flow cross section of the tubing as a result of salt deposition. The normal working value of the buffer pressure at the mechanized method of production (in particular, ESP) and the use of booster pumping stations 1-1.5 MPa in the oil collection system.
При одновременном измерении величины буферного давлени и расчете показател стабильности видно, что после перехода значений показател в положительную область начинаетс увеличение буферного давлени на 1,5-2,0 МПа по сравнению с первоначальным . После проведени кислотной обработки величина буферного давлени резко падает до первоначального, а значение показател стабильности становитс отрицательным .With simultaneous measurement of the buffer pressure and the calculation of the stability indicator, it can be seen that after the transition of the values of the indicator to the positive region, an increase in the buffer pressure of 1.5-2.0 MPa begins as compared with the initial one. After the acid treatment, the buffer pressure drops sharply to the initial value, and the value of the stability indicator becomes negative.
1515
2020
2525
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU843782089A SU1218090A1 (en) | 1984-05-18 | 1984-05-18 | Method of determining salt deposition in oil well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU843782089A SU1218090A1 (en) | 1984-05-18 | 1984-05-18 | Method of determining salt deposition in oil well |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1218090A1 true SU1218090A1 (en) | 1986-03-15 |
Family
ID=21135274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU843782089A SU1218090A1 (en) | 1984-05-18 | 1984-05-18 | Method of determining salt deposition in oil well |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU1218090A1 (en) |
-
1984
- 1984-05-18 SU SU843782089A patent/SU1218090A1/en active
Non-Patent Citations (1)
| Title |
|---|
| Авторское свидетельство СССР № 643632, кл. Е 21 В 47/12, 1979. Авторское свидетельство СССР № 747383, кл. Е 21 В 47/12, 1980. * |
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