Procedure for restraint of water production in well

FIELD: oil and gas production.

SUBSTANCE: procedure for restraint of water production in well consists in pumping solution of CL (cultural liquid) into insulated interval. Two equal portions are pumped. The first portion corresponds to solution of CL prepared on soft water of 1000 kg/m3 density at ratio 1:0.5-1, while the second one corresponds to solution prepared on reservoir mineralised water of density up to 1190 kg/m3 at ratio 1:0.3-0.5.

EFFECT: raised efficiency of repair-insulation operations due to creation of more resistant to water outbreak screen of water solutions of silicon-organic liquid - CL with controlled period of gelation excluding their preliminary hardening.

3 tbl

 

The proposal relates to the oil and gas industry, is intended for repair and insulation works well and can be used with the use of coiled tubing.

A known method of limiting water production in the well, including the preparation and injection into the well an aqueous solution of silicone fluid [Stroganoff V.M., Stroganoff A.M. Silicone grouting materials AKOR: pathways and prospects. Interval No. 6, 2006, p.24-30]. Silicone fluid AKOR bn and water with a pH of<about 6.5 at a ratio of 1:3 mix in the tanks of the retainer Assembly CA-320, the resulting composition is pumped through tubing in the well.

The disadvantage of this method is that used in its composition can be used effectively only when the reservoir temperature is above 40°C. the dwell Time of the composition in the reservoir at the time of gelation at temperatures below 40°C is more than 32 hours, which increases the cost of repair and insulation works.

The closest in technical essence to the present invention is a method of restricting the water in the well (patent No. 2360099, E21B 33/138, publ. 27.06.2009, bull. No. 18), which includes the preparation and injection into the well an aqueous solution of silicone fluid (QOL). Before or after the injection of an aqueous solution of silicone fluid Sukacheva is t an aqueous solution of sodium silicate in the following ratio of reactants, volume. %:

an aqueous solution of sodium silicate
density 1050-1100 kg/m320-40
an aqueous solution of silicone fluids60-80,

moreover, an aqueous solution of organosilicon liquid obtained by mixing with formation water density 1000-1180 kg/m in the following ratio, volume. %:

silicone fluid20-70
produced water density 1000-1180 kg/m330-80,

and the injection is produced through a flexible pipe or through the tubing.

The disadvantage of this method is the short time of gelation, QOL in contact with an aqueous solution of sodium silicate instantly forms a gel that prevents deeper penetration of an aqueous solution of QOL in the porous medium of the insulated layer, and in addition, may lead to an emergency situation - premature setting in tubing or flexible pipe.

The technical objective of the proposal is to increase the effectiveness of re is onto insulation works by creating a longer and more resistant to water breakthrough screen from aqueous solutions QOL with adjustable period of gelation, prevent premature curing.

The problem is solved by the method of limiting water production in a well, comprising the sequential injection in the isolated interval fluids silicone fluids (QOL) in water.

What's new is that the injection is produced in two equal portions, the first of which is a solution of QOL, 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.

In the proposed invention may be used various silicone fluids, such as ethylsilicate, cement product 119-204, however, it is preferable to use silicone grouting materials group AKOR-bn - based on a mixture of polyesters orthosilicic acid of varying degrees of polymerization (AKOR-BNWA, AKOR-BN, AKOR-BN, AKOR-BNUS, AKOR-BN and AKOR-BN)that THE 2458-001-01172772-99 represent the liquid from yellow-brown to dark brown color with a freezing point below minus 50°C. and a dynamic viscosity of 1-30 MPa·s (at 20°C). In the presence of water AKOR-bn hydrolyzed with the formation of liquid water-soluble products, which are then otverzhdajutsja (heliroute).

The essence of the invention consists in the following. Into the well through tubing eligible pipe, launched in the interval isolation, sequentially inject an aqueous solution of QOL prepared in the ratio RY: fresh water density of 1000 kg/m3equal to 1:0.5 to 1. Next, inject the same volume of an aqueous solution QOL prepared on the formation of mineralized water density 1100-1190 kg/m3in the ratio of 1:0.3 to 0.5. This method of injection is due to the fact that the time of gelation of an aqueous solution of QOL, cooked in fresh water density of 1000 kg/m3longer than solution, prepared by formation of mineralized water density 1100-1190 kg/m3. The first solution due to this and a low viscosity penetrates deeper into the porous medium of the insulated layer, and the second solution helium before the first and prevents extrusion of the layer, forming a gel with a higher density.

When testing water properties of silicone grouting materials group AKOR-bn (QOL) it was found that the results differ slightly, so all tests will be illustrated on the example of the most typical representative of these materials - reagent AKOR-bn 102.

Viscosity of aqueous solutions of QOL measured by the unit FBG-1, in laboratory conditions studied their gelation at a temperature of 20°C. the Results of laboratory studies are shown in table 1, which have, that compounds containing water of density 1000 kg/m3in the ratio RY: water of 1:0.5 to 1, the gelation time is longer (8 h 20 min to 28 h), and a viscosity less than that of compositions containing stratiform mineralized water density of 1190 kg/m3that promotes deeper penetration of the solution of QOL in the pores of the formation. When the ratio RY: formation mineralized water density 1100-1190 kg/m31:0,2, the gelation time is 1 h 20 min and 1 h, which is insufficient for safe injection and may lead to an emergency situation. The ratio RY: formation mineralized water density 1100-1190 kg/m3equal to 1: 0.3 to 0.5, gives the optimal time of gelation within 2 h 30 min - 6 h 10.

Table 1
No.The solution quality of life in fresh water density of 1000 kg/m3The solution QOL in minutes produced water density 1100 kg/m3The solution QOL in minutes produced water density of 1190 kg/m3The gelation time, hour-min
Quantity of water per 100 ml AKOR-BN, mlSrvc. the viscosity of the solution, the Quantity of water per 100 ml AKOR-BN, mlSrvc. the viscosity of the solution, withQuantity of water per 100 ml AKOR-BN, mlSrvc. the viscosity of the solution, with
11507,538-00
21508,231-00
31508,326-00
4100a 12.728-00
510013,1 24-40
610013,519-30
77013,120-00
87013,916-50
97014,710 : 00 am
105014,18-20
11 5014,86-10
125015,74-20
133014,74-30
1430the 15.63-30
153016,12-30
162015,22-00/td>
172016,01-20
182016,61-00

The quality of the resulting gel depends on the concentration of reagent and water salinity mixing. It is known that with increasing water salinity and the concentration of the solution QOL density gel-like material increases (Pies CENTURIES, Pasinkov VG, Lymar IV, Ageenko E.V., Demyanenko N.A., Stroganoff V.M., Stroganoff A.M. Effectiveness of new technologies limit water production, proven oil fields Republican unitary enterprise "production Association "Belorusneft" in 2002-2003, the Search for and development of petroleum resources of the Republic of Belarus: Sat. scient. works. - Issue 5, part 2. - Gomel: BelNIPIneft, 2004. - C-83). This is confirmed by the results of tests that were performed on models of the formation length of 120 cm and an inner diameter of 2.7 cm, filled with quartz sand. The selection of the fractional composition of quartz sand got the model with permeability of 0.9 to 1.7 μm2. the La modeling watered oil reservoir via a pre-filled oil reservoir model used to pump water. Then in a different model of the reservoir was pumped solutions QOL fresh water density of 1000 kg/m3in the ratio RY: water of 1:0.5 to 1, and the solutions QOL on the formation of mineralized water density of 1100 and 1190 kg/m3in the ratio RY: water of 1:0.3 to 0.5, on a "well-formation". Next, the model was left to react for 24 hours, then pumping the water to a reservoir-well", was determined by the pressure of the water breakthrough.

The average of the results presented in table 2, it is obvious that the pressure of the water breakthrough in models where the injected solution QOL with mineralized water more than in models with fresh water, increasing the concentration of QOL in solution also leads to an increase in pressure of water breakthrough in the models.

Table 2
No.The composition of the solution (the ratio of QOL:water)Pressure breakthrough model after the reaction for 24 hours, MPa/m
The solution quality of life in fresh water density of 1000 kg/m3The solution QOL on the formation of mineralized water density 1100 kg/m3The solution QOL on the formation of mineralized water density of 1190 kg/who 3
11:11,5
21:12,3
31:12,8
41:0,72,7
51:0,73,6
61:0,7a 3.9
71:0,5the 3.8
81:0,54,3
91:0,5 5,1
101:0,3a 4.9
111:0,3of 5.4
121:0,3the 5.7

The increase in pressure breakthrough with increasing water salinity up to 1190 kg/m3and the concentration of CR in the solution until the ratio RY: water of 1:0.3 to 0.5, confirms the increase in the density of the obtained gel, therefore, the application of the method of sequential injection solutions QOL fresh water density of 1000 kg/m3in the ratio RY: water of 1:0.5 to 1, and the formation of mineralized water density 1100-1190 kg/m3in the ratio RY: water of 1:0.3 to 0.5, contributes to the fact that the first solution due to the low viscosity penetrates deeper into the porous medium of the insulated layer, and the second solution helium before the first and prevents extrusion of the layer, forming a gel with a higher density.

To determine the optimum ratio of the portions of QOL solutions prepared with fresh and mineraliza the Noi water in the reservoir model, I downloaded two portions solutions QOL in different proportions, the results of the tests are presented in table 3.

Table 3
No.The ratio of the portions of aqueous solutions of QOL in fresh water density of 1000 kg/m3and formation miner, water density of 1190 kg/m3respectivelyPressure breakthrough model after the reaction for 24 hours, MPa/m
The solution quality of life in fresh water density of 1000 kg/m3in a 1:1 ratio with a solution of QOL on the reservoir miner. water density of 1190 kg/m3in the ratio of 1:0,5The solution quality of life in fresh water density of 1000 kg/m3in the ratio of 1:0.7 with a solution of QOL on the reservoir miner. water density of 1190 kg/m3in the ratio of 1:0,5The solution quality of life in fresh water density of 1000 kg/m3in the ratio of 1:0.5 in solution QOL on the reservoir miner. water density of 1190 kg/m3in the ratio of 1:0.3 to
11:0,31,62,93,5
21:0,5 2,73,3the 3.8
31:0,73,2a 3.94,3
41:14,0the 4.75,5
51:1,54,04,85,6

From the presented results in table 3 it follows that the optimum is equal to the ratio of the portions, as at a ratio of 1:0.5 pressure breakthrough model after the reaction for 24 hours was 2.7, 3.3 and 3.8 MPa/m, with a 1:1 ratio increased to 4.0, 4.7 and 5.5 MPa/m, when the magnification ratio to 1:1.5 pressure did not change significantly: about 4.0, and 4.8 and 5.6.

Thus, in this proposal results - improving the efficiency of repair and insulation works by creating a longer and more resistant to water breakthrough screen from aqueous solutions QOL with adjustable period of gelation preventing their premature curing. The method can reduce the volume of produced water in comparison with the prototype by 25-30%, respectively, to reduce material costs n the oil.

A way of limiting water production in a well, comprising the sequential injection in the isolated interval solution of silicone fluid - QOL in water, characterized in that the injection produce two equal portions, the first of which is a solution of QOL, 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.



 

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20 cl, 1 tbl

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20 cl, 1 tbl

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20 cl, 1 tbl

Gelling composition // 2428451

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3 ex, 3 tbl

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EFFECT: reduced power inputs for well drilling, as well as reduced coefficient of friction between drilling tool and well wall.

1 tbl

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