SU605935A1 - Method of preventing inflow of stratal water - Google Patents
Method of preventing inflow of stratal waterInfo
- Publication number
- SU605935A1 SU605935A1 SU762365317A SU2365317A SU605935A1 SU 605935 A1 SU605935 A1 SU 605935A1 SU 762365317 A SU762365317 A SU 762365317A SU 2365317 A SU2365317 A SU 2365317A SU 605935 A1 SU605935 A1 SU 605935A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- water
- preventing inflow
- formation
- stratal water
- permeability
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
Landscapes
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Description
Изобретение относитс к способам понижени проницаемости и закупорки продуктивных пластов, в частности дл изол ции притоков пластовых вод к эксплуатационным нефт ным и газовым скважинам. Известен способ изол ции водопри тока к эксплуатационным скважинам, заключающийс в использовании полиме ных материалов на основе солей акриловой кислоты ll. Недостатком известного способа в л етс низкий закупоривающий эффект. Известен также способ изол ции при токов пластовых вод к эксплуатационным скважинам путем закачки в пласт водного раствора гидролизованного полиакрилонитрила (гипана) t lОднако и дл этого способа характерен низкий закупоривающий эффект. Целью изобретени вл етс повыше ние закупоривающего эффекта. Дл достижени поставленной цели в пласт закачивают дополнительно вид ный раствор азотнокислого свинца. Сущностьспособа состоит в том, чт в пласт последовательно закачивают водный раствор гидролизованного поли акрилонитрила (гипана) и водный раст вор азотнокислого свинца. В результате взаимодействи гидролизованного полиакрилонитрила , азотнокислого свинца, а ионов металла и хлора пластовой воды между собой образуетс смесь осадков и гелеобразна масса, представл юща собой комбинацию солей гидролизованного полиакрилонитрила с ионами свинца и с ионами металлов пластовой воды. Пример . В образцы пористой среды с различной проницаемостью закачивают пластовую воду, при этом замер ют проницаемость объемным способом. Затем в образцы под давлением нагнетают водные растворы азотнокислого свинца и гидролизованного полиакрилонитрила, а между ними нейтральную жидкость, например воду, и затем продавочную жидкость . После этого под рабочим давлением образцы выдерживают в течение 7 сутбк , затем их вновь испытывают на проницаемость пластовой водой. Проницаемость, пористых сред в результате обработки по предложенному способу снижаетс в 500-2000 раз, что соответствует уменьшению водопритока на 80-95%.The invention relates to methods for reducing permeability and plugging of productive formations, in particular for isolating the inflow of formation water to production oil and gas wells. There is a method of isolating water flow to production wells, which involves the use of polymeric materials based on acrylic acid salts ll. The disadvantage of this method is low clogging effect. There is also known a method of isolating, when currents of formation water are fed, to production wells by pumping into the formation an aqueous solution of hydrolyzed polyacrylonitrile (hypana) t lHowever, this method also has a low blocking effect. The aim of the invention is to increase the clogging effect. In order to achieve this goal, an additional lead nitrate solution is additionally injected into the formation. The essence of the method is that an aqueous solution of hydrolyzed polyacrylonitrile (hypana) and an aqueous solution of lead nitrate are sequentially pumped into the formation. As a result of the interaction of hydrolyzed polyacrylonitrile, lead nitrate, and metal ions and formation water chlorine, a mixture of precipitates and a gel-like mass are formed, which is a combination of salts of hydrolyzed polyacrylonitrile with lead ions and ions of formation water metals. An example. Produced water is pumped into samples of a porous medium with different permeability, and the permeability is measured in bulk. Then, aqueous solutions of lead nitrate and hydrolyzed polyacrylonitrile are injected into the samples under pressure, and between them a neutral liquid, for example, water, and then a squeezing liquid. After that, under working pressure, the samples are incubated for 7 estub, then they are again tested for permeability with formation water. The permeability of porous media as a result of processing by the proposed method decreases by a factor of 500-2000, which corresponds to a decrease in water inflow by 80-95%.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU762365317A SU605935A1 (en) | 1976-05-24 | 1976-05-24 | Method of preventing inflow of stratal water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU762365317A SU605935A1 (en) | 1976-05-24 | 1976-05-24 | Method of preventing inflow of stratal water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU605935A1 true SU605935A1 (en) | 1978-04-20 |
Family
ID=20663129
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU762365317A SU605935A1 (en) | 1976-05-24 | 1976-05-24 | Method of preventing inflow of stratal water |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU605935A1 (en) |
-
1976
- 1976-05-24 SU SU762365317A patent/SU605935A1/en active
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