Method for blocking high-penetrable watered oil beds

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

 

The invention relates to the oil industry, in particular to a method of blocking to supply high-permeability oil reservoirs, alignment profiles injectivity of injection wells.

There is a method of isolation of the water in the wells (A.S. 1421849 the USSR, MKI 4 E 21 In 33/138, 1988), in which the staple giana is used an aqueous solution of aluminium chloride. The disadvantage of this method is the high concentration of aluminium chloride (30%), which significantly increases the cost of schweinebraten.

There is a method of isolating the water in the well (U.S. Pat. 1797644 the USSR, MKI 5 E 21 In 33/138, 1993). The method involves the injection of water-soluble polymer and the clay component in powdered state in the carrier fluid, which use oil. The disadvantage of this method is that the clay is ineffective staple for the formation of three-dimensional structure of the gel of polyacrylamide (PAA) due to adsorption of the moving parts of the swollen polymer. The adsorption process is reversible and under certain conditions will prevail reverse process - desorption, which will lead to the violation of the insulation screen.

Closest to the proposed method of blocking high permeability layers (U.S. Pat. 2176309 of the Russian Federation, IPC 7 E 21 In 33/138, 43/32, 1999). This method of blocking wysoker nicemy to supply oil reservoirs involves the injection of anhydrous mixture of oil products the carrier fluid powdered water-soluble polymer and a binder, as specified mixture of anhydrous petroleum products use a mixture of anhydrous oil and light pyrolysis resin in a volume ratio of 9:1-1:9, and as a staple Supplement for additional dry chlorides of magnesium, calcium, barium, aluminum, copper, iron or mixtures thereof in amounts of 0.05-0.2% by weight of the carrier liquid or 30-100% by weight of powdered water-soluble polymer.

The problem is solved due to the fact that in method block to supply high-permeability oil reservoirs, including injection into the carrier fluid is a mixture of anhydrous petroleum products containing anhydrous oil, powdered water-soluble polymer and a binder in a quantity of 0.05-0.2% by weight of the carrier liquid or 30-100% by weight of powdered water-soluble polymer as the above-mentioned mixture, a mixture of anhydrous oil and light oil waste in the ratio of 0.1:9,9-9,9:0,1, and staple dry acetate of magnesium, calcium, barium, aluminum, iron, manganese, chromium or their of the mixture.

The effectiveness of the proposed method block to supply high-permeability oil reservoirs were tested in laboratory conditions on the linear reservoir models with artificial crack. The linear model of the reservoir was filled with quartz fraction is th sand (0.05-0.2 mm). Next, the model was evacuated, filled the reservoir with water, saturated with anhydrous oil, replaced oil technical water to oil displacement (modeled completely flushed areas).

In the washed model was pumped blocking composition containing anhydrous liquid carrier powdered water-soluble polymer and dry acetates of the metals, in the amount of 20% of the pore volume of the model. Exercised restraint 24 h, and then resumed pumping industrial water. The criterion for evaluating the effectiveness of the proposed method is used to seal effect (η) or the degree of isolation, which is determined on the basis of the data obtained during the test, calculated by the formula

where K0- permeability model of the formation prior to injection of the blocking material, μm2; K - coefficient of permeability of the formation model after injection of the blocking material, mm.

The results of the experiments are shown in the table.

Thus, the optimal number of sulfates of metals can be considered of 0.05-0.2% by weight of the carrier liquid or 30-100% by weight of powdered water-soluble polymer.

Using the proposed method provides in comparison with known methods of increasing the stability and durability of waterproofing of the screen, which significantly increases the efficiency of the unit is by permeable rocks and as a consequence, provides a longer turnaround mileage well. In addition, the proposed method extends the range of powdery staplers water-soluble polymers and liquid media.

Table
no experienceThe addition of acetates of the metals on the weight of the carrier liquid, %The addition of water-soluble polymer on the weight of the carrier liquid, %Bridging effect, %
1-0,153,2
20,010,162,1
30,050,170,4
40,100,175,3
50,150,180,7
60,200,1to 83.5
70,250,187,2
80,010,273,4
90,050,2to 78.3
100,100,2an 80.2
110,150,285,7
120,20 0,293,9
130,250,294,0
Note: as acetate used SG(CH3Soo)3; similar results were obtained using magnesium acetate, calcium acetate, barium acetate, aluminum acetate, iron acetate, manganese acetate, or mixtures thereof; a carrier liquid is used a mixture of anhydrous Devonian oil and light oil used in the ratio of 1:1 (other ratios give similar results).

Sources of information

1. A.S. 1421849 the USSR, MKI 4 E 21 In 33/138. The method of isolation of the water in the wells / Rev, Higbee, Isconova and others (USSR). No. 4109751/22-03; Claimed 25.08.86; Publ. 07.09.88. Bull. No. 33.

2. Pat. 1797644 the USSR, MKI 5 E 21 In 33/138. The method of isolation of water in the well / Nevelsky, Mcclimon (USSR). No. 4915996/03; Claimed 05.03.91; Publ. 23.02.93. Bull. No. 7.

3. Pat. 2176309 of the Russian Federation, IPC 7 E 21 In 33/138, 43/32. The method of locking the high-permeability layers / Mhitarov, Grandora, ITV etc. (RF). No. 99124518/03; Claimed 23.11.1999; Publ. 27.11.2001. Bull. No. 33.

The method of locking to supply high-permeability oil reservoirs, including injection into the carrier fluid is a mixture of anhydrous petroleum products containing anhydrous oil, powder soluble in water is first polymer and a binder in a quantity of 0.05-0.2 % by weight of the carrier liquid or 30-100 % by weight of powdered water-soluble polymer, characterized in that the above-mentioned mixture, a mixture of anhydrous oil and light oil products, used in a ratio of 0.1:9,9 - 9,9:0,1, and staple dry acetate of magnesium, calcium, barium, aluminum, iron, manganese, chromium or their mixtures.



 

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EFFECT: higher efficiency.

2 tbl

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