Compound for water isolation of low-temperature beds

FIELD: oil industry.

SUBSTANCE: compound has carbomide, urotropine and water, additionally has chlorine iron with following relation of components in percents of mass: carbomide 6.0-16, urotropine 5.0-8.0, chlorine iron 5.0-10, water the rest.

EFFECT: higher efficiency.

8 ex, 2 tbl

 

The invention relates to the oil industry and can be used for enhanced oil recovery of low-temperature layers in the processing of flooded wells flooding.

Known composition for enhanced oil recovery - an aqueous solution containing aluminum salts, urea, forming a bulky gel directly into the reservoir, and the temperature at the bottom hole should be at least 70° (RF patent No. 2061856). The disadvantage of this method is that it can only be used for reservoirs with temperatures above 60-70°C.

Known composition for enhanced oil recovery and isolation of water to wells by increasing the resistance formed in the layer of gel (RF patent No. 2076202 from 18.10.94, CL E 21 In 43/22, 33/138). The composition contains aluminum salts, urea, polyacrylamide and water in the following ratio, wt.%: polyacrylamide 0,5-2,5; aluminium chloride 0,4-17,0; urea 1,5-30,0; water - the rest. The disadvantage of this composition is the use at high temperatures 90°C.

Closest to the claimed is a composition containing urea, aluminium salts, water and urotropine (RF patent No. 2066743 from 08.02.93, CL E 21 In 43/22). The composition contains the following components, wt.%: urea 4-16, aluminum chloride or nitric acid (in recalculation on anhydrous) 2-4, methenamine 2-8 and water - the rest. Methenamine (hexamethylene the Ramin) promotes the formation of a gel at low temperatures. However, the strength properties of the gels of the composition deteriorate over time, is the aging of the gels emitting fluid that determines the need for frequent re-treatments.

The aim of the invention is to improve the strength and adhezionih properties of the proposed structure by reducing fluid in the aging process of the gel.

The authors propose a composition for water insulation low temperature formations containing urea, methenamine and water, which further comprises ferric chloride in the following ratio, wt.%:

Urea 6,0-16

Methenamine 5,0-8,0

Ferric chloride 5,0-10

Water - the rest

Ferric chloride (TU 6-00-05763458-129-91) is a pasty mass of brownish-orange color.

The essential difference is the use of ferric chloride in combination with urotropine, the use of which allows to form strong gels in the low-temperature reservoir without fluid in the aging process. Over time is not the destruction of the gel.

One of the main characteristics of gel-forming compositions for enhanced oil recovery is to preserve the strength of the gels over time.

Experimental verification of the ability to form strong gels was performed by incubation of compounds, you need a kitchen is by using ferric chloride, urea, methenamine at low temperature for 30 days. For comparison thermostatically compositions proposed in the patent of Russian Federation №2066743 from 08.02.93, CL E 21 In 43/22 - aqueous solutions on the basis of ferric chloride, urea and hexamine. Each composition was prepared in a quantity of 50 ml of the gel Formation occurred after 8-10 hours.

Then the compositions were thermostatically at a temperature of 20°C. After 3, 10, 20, 30 days were measured singled fluid in the process of aging gels.

Example 1 (the prototype, the composition according to the patent of the Russian Federation 2066743 from 08.02.93, CL E 21 In 43/22). Prepared aqueous composition of 50 ml, containing 14 wt.% urea, 8 wt.% urotropine, 3 wt.% aluminum chloride, the rest is water. The composition is well stirred. 8 hours later formed a gel. Gel thermostatically at 20°C. the Amount of discharged liquid in the aging process are presented in the table.

Examples 2-3, analogous to example No. 1, are structures on the basis of urea, methenamine, aluminum chloride.

Example No. 4-8 - compositions using ferric chloride, urea, methenamine. The compositions were also prepared in a quantity of 50 ml each. The gelation time of 8-10 hours. Temperature control was carried out at 20°C. the table presents the results of the temperature control composition No. 1-8 at 20°C.

To assess the effectiveness of the waterproofing properties of the proposed structure (nutropin - 8%, urea - 16%, ferric chloride - 10%) were filtrazione experiments. The study was conducted on a natural sample of quartz Sandstone, absolute permeability which amounted ToVOD=603 MD. First measured the permeability of the core, water-saturated (KVOD=45,6 MD), this was followed by filtration of the gel-forming composition. Then the core was placed for 24 hours in water and then conducted a second filtering water. Permeability amounted ToVOD=5,4 MD. The permeability of water after the injection of a gel-forming composition decreased 8.5 times.

Thus, the proposed structure can be used at low formation temperatures for more efficient isolation of water by improving the strength properties of the composition.

Table
Composition, wt%Discharge of fluid, ml %
72 hours10 days20 days30 days
1Urea 14%6142030
Methenamine 8%    
Alumar 3%     
2Urea 6%461113
Methenamine 8%    
Alumar 3    
3Urea 12%561018
Methenamine 7%    
Alumar. 3%    
The proposed composition    
4Urea 6%----
Ferric chloride 5%    
Methenamine 8%    
5Urea 16%----
Ferric chloride 5%    
Methenamine 5%    
6Urea 16%----
Ferric chloride 5%    
Methenamine 8%    
7Urea 6%----
Ferric chloride 10%    
Methenamine 5%    
8Urea 6%    
Ferric chloride 10%    
Methenamine 8%    

Composition for water insulation low temperature formations containing urea, methenamine, and water, wherein the composition further comprises ferric chloride in the following ratio, wt %:

p num="28"> Urea 6,0-16

Methenamine 5,0-8,0

Ferric chloride 5,0-10

Water the Rest



 

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