Isolation method of water inlux to well

FIELD: oil and gas industry.

SUBSTANCE: isolation method of water influx to well includes injection of organosilicone product to the isolated interval. At mixing to Devonian oil is added to organosilicone product; product 119-296I of B trademark is used as organosilicone product. The water is added with density of 1000-1190 kg/m3, the composite is mixed and injected to the isolated interval with the following ratio of ingredients, parts by volume: product 119-296I of B 100 trademark, water with density of 1000-1190 kg/m3 50-100, Devonian oil 10-20. The composite is reinforced by injection of liquid glass. At that buffer of fresh water is injected between the composite and liquid glass.

EFFECT: improved efficiency of water influx isolation due to regulation of time for gel formation of the injected composite and prevention of its early gel formation.

1 tbl

 

The invention relates to the oil industry, in particular to methods isolation of water influx into the borehole with the use of organosilicon compounds may be used for isolation of water in producing wells and profile control injectivity of injection wells.

There is a method of isolating the water in the well (patent RU №2359003, IPC C09K 8/44, publ. 20.06.2009, bull. No. 17), including injection into the well structure in the following ratio of ingredients, about. including:

product 119-296100
isopropyl alcohol7-17
oil Devonian10-30
hydrochloric acid5,0-20

To the product 119-296 add isopropyl alcohol and oil, mix until a homogeneous solution, then poured the technical solution of hydrochloric acid and mix thoroughly. The curing time ranged from 40 minutes to 7 hours and 10 minutes.

The disadvantage of this method is that if the restriction of water in carbonate reservoirs, the formation of water conveyance channels due to the interaction of hydrochloric acid with the breed that the drive is to increase the water content of the produced oil. Used as a initiator for the curing of hydrochloric acid causes corrosion of the metal casing and tubing (tubing). It should also be noted that when using the known method it is necessary to effect consolidation of the backfill mass of cement, otherwise it is taken out of the reservoir.

The closest technical solution to the present invention is a method of restricting water production in a well, comprising the sequential injection in the isolated interval solutions of silicone fluid (product) water injection to produce two equal portions, the first of which is the solution of silicone product, cooked in fresh water density of 1000 kg/m3in the ratio of 1:0.5 to 1, and the second on the formation of mineralized water density of 1190 kg/m3in the ratio of 1:0.3 to 0.5 (patent RU №2431735, IPC E21B 33/138, publ. 20.10.2011, bull. No. 29).

The disadvantage of this method limits the water in the well is that part of some organosilicon products are distillation residues as waste production, which have volatile composition and contain chlorine in number, causing too rapid reaction and unregulated gelation, which can lead to an emergency situation on the well.

The technical task of the suggestions I have is to increase the efficiency of isolation of water by regulating the timing of gelation of the injected composition and prevent premature gelation.

The technical problem is solved by the proposed method, isolation of water in the well, comprising pumping into the isolated interval organosilicon product.

What is new is that silicon-based product with stirring, add oil Devonian, as organosilicon product use product 119-I grade B, then add water density 1000-1190 kg/m3, mix and inject the composition into the isolated interval in the following ratio of ingredients, about. including:

product 119-I grade B100
water density 1000-1190 kg/m350-100
oil Devonian10-20

fix the composition of the injected liquid glass, and between composition and liquid glass fetch buffer of fresh water.

Product 119-I grade B on THE 2229-519-05763441-2009 with amendment # 1 is a water-soluble composition of amoxicillinum - liquid from yellow to black. In the interaction of product 119-I grade B water density 1000-1190 kg/m3ethoxypropan silicone product is hydrolyzed and formed silanol, resulting in gelation, moreover, is in summer use mostly fresh water density of 1000 kg/m 3and in the winter - salt water density 1000-1190 kg/m3.

Glass sodium liquid (liquid glass) according to GOST 13078-81 is a thick liquid yellow or gray in color, free of mechanical impurities and inclusions that are visible to the naked eye.

Oil Devonian Romashkinskoye field contributes to the homogenization of the composition of the proposed method ensures the stability time of gelation, prevents the formation of gel in the oil-saturated part of the reservoir, that is, contributes to increase the degree of selectivity when plugging flooded areas of the oil reservoir and the efficiency of isolation of water.

The essence of the method consists in the following. In the pump cementing unit CA-320 product mix 119-I grade B and Devonian oil, then add fresh water density 1000-1190 kg/m3and again mix. Into the well through tubing or flexible pipe lowered into the interval isolation, consistently pumped obtained in the measuring device Assembly structure, the buffer of fresh water and fix liquid glass, which cures upon contact with the composition. Well leave it up to the time of melirovanie composition and curing of liquid glass.

Water properties of the composition of the proposed method and its closest analogue investigated the laboratory conditions. The gelation time of the obtained compositions were determined as follows. Three glass cups were placed components of the composition and mixed. Noted the time from the start of the premises glasses with the composition in thermostat, which maintained a temperature of 25°C. the Time after which the composition was begun to flow in a continuous stream from the end of the glass rod after its immersion in the composition, took over the starting time of gelation. Periodically tilting the glasses, recorded the time when the meniscus has ceased to move. Determined in this way time is the end time of gelation of the test composition. The start and end time of gelation is defined as the arithmetic mean value of three measurements. The results of laboratory tests are shown in table.

In a glass beaker with a volume of 300 ml was poured about 100. h (100 ml) product 119-I grade B, about 20. tsp (20 ml) oil Devonian, was stirred for 1 min until a homogeneous solution. To the resulting solution was added about 100. h (100 ml) of water density of 1000 kg/m3and the resulting composition was thoroughly mixed. The time of gelation was 15 h (see table No. 8). Other experiments were made similarly. Gelation of the composition in experiment No. 8 was uniformly without buildup and premature precipitation. For preparation of the composition is and pumping it into the well requires from 3 to 15 h, thus the optimal gelation time is from 3 to 15 h In the experiments№№1, 3, 5, 10, 12, 14, 16, 18, 21, 22, in which has not been used for oil Devonian, and in experiments No. 6 and 24 using 5 ml of Devonian oil when mixing occurred sticking to the bottom of the Cup, and after 10 minutes the bottom formed a gel in the amount of 30% of the total. Adding oil Devonian within 10-20 ml (optimal amount) build-up did not occur, and the gel in the experiments№№7, 8, 11, 13, 15, 17, 19, 20 formed in the optimum time. Adding 25 ml of oil Devonian increased the gelation time and the excess oil remained on top of the gel (experiment No. 9).

According to the results presented in the table, we can see that content in the oil composition of Devonian less than 10 and more 20 about. including making the composition unsuitable for use in insulation works, and is optimal oil content of Devonian within 10-20 ml (about 10-20. hours) per 100 ml of product 119-I mark B. Based on the optimal time of gelation was chosen as the optimal ratio of product 119-I grade B, Devonian oil and water. Compositions No. 21-26 with a gelation time of less than 3 h and No. 1-4, 9 with the gelation time more than 15 hours were excluded because the time is less than 3 hours is not enough for implementing the method on a well, and more than 15 hours too long, the composition for this time can betweenan from the isolation zone. Based on the data in the table were selected optimum ratio of ingredients (experiments№№7, 8, 11, 13, 15, 17, 19, 20), about. including:

product 119-I grade B100
water density 1000-1190 kg/m350-100
oil Devonian10-20

An example of the proposed method. The proposed method was applied for isolation of Obvodnogo the formation in well with the current slaughter 1752 m and perforation interval uncovered productive horizon in the interval 1735-1737,5 meters

Well with the help of cementing unit CA-320M prepared composition, which in the first half of the dipstick retainer Assembly CA-320M gained about 100. h (1.5 m3product 119-I grade B and about 10. hours (0.15 m3) Devonian oil, mixed. In the second half of the dipstick got about 100. h (1.5 m3water density 1000 kg/m3and the contents of the dipstick Assembly was mixed for 30 minutes tubing with a diameter of 73 mm lowered to a depth of 1736 m and pumped 3.15 m3the composition prepared in the pump cementing unit, a buffer of water density of 1000 kg/m3of 0.4 m3, 1 m3liquid glass and water in the volume is of 5.7 m 3for jacking composition in isolated interlayer. Tubing is raised to 200 m to avoid them sticking hardened composition and the left hole on the response within 24 hours Then well mastered and put into operation. In the result, the water cut wells decreased by 20%, additional oil production was at 2 tons per day.

Thus, the proposed method improves the efficiency of isolation of water by regulating the timing of gelation of the injected composition and prevent premature gelation.

td align="center"> 100tr>
The results of laboratory tests.
No.No. 119-I grade B, vol. h (ml)Quantity of water density of 1000 kg/m3about. h (ml)Quantity of water density of 1100 kg/m3about. h (ml)Quantity of water density of 1190 kg/m3about. h (ml)Qty oil Devonian, about. h (ml)The gelation time, hrsNotes
1100150- --30*
21001502036**
3100-150--22*
4100-1501024**
5100100-12*
6100100512*
71001013**
81001002015**
91001002520***
10100-100--9*
11100--1001510**
1210050---8*
1310050--1510**
14100-50--6*
15100--50107**
1610040---5*
1710040--106**
18100-40- -4,5*
19100--40104**
2010025--103**
2110025---2,5*
22100-25--2*
23100--25101,5**
2410015 51*
25100-15--The gel was formed by mixing
26100--151515 min**
* After 10 minutes the bottom of a gel is formed, ~30% of the volume;
** Gel prematurely is not formed;
*** Gel prematurely is not formed, but increases the gelation time and the excess oil remains on top of the gel.

The way to isolate water production in a well, comprising pumping into the isolated interval silicone product, wherein the organosilicon product with stirring, add oil Devonian, as organosilicon product use product 119-I grade B, then add water density 1000-1190 kg/m3/sup> , mix and inject the composition into the isolated interval in the following ratio of ingredients, about.h.:

product 119-I grade B100
water density 1000-1190 kg/m350-100
oil Devonian10-20

fix the composition of the injected liquid glass, and between composition and liquid glass fetch buffer of fresh water.



 

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1 ex, 2 tbl, 3 dwg

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2 ex, 1 tbl

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FIELD: chemistry.

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2 tbl, 1 dwg

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1 tbl

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