The method of regulating the permeability sandstone reservoir

 

(57) Abstract:

The invention relates to the oil industry, in particular to methods limit water production in oil wells and the injectivity profile alignment. The technical result is to increase the efficiency of the permeability reduction flooded high-permeability Sandstone reservoir by creating a durable gel blocks in the reservoir. The method is carried out by injection into the reservoir through injection wells of large amounts of compositions with controlled gelation time as a gelling solution using zeolite and hydrochloric acid. After downloading...0,90 0,40 volume of the gel-forming solution is injected daily gel-forming composition consisting of five consecutive fringes: fringe aqueous hydrochloric acid solution with a mass concentration of 15%, rim freshwater rims gelling composition containing hydrolyzed in alkali waste fibers or fabrics of polyacrylonitrile, rims fresh water and rims aqueous hydrochloric acid solution with a mass concentration of 15%. Moreover, the scope of this daily gel-forming composition is 0,05 0,5...) q at a ratio of 2:1:2 volumes rims of zakachki gelling solution based on the zeolite, m3/day). Then carry out the displacement of waste water volume equal to the daily volume of gel-forming solution on the basis of the zeolite, and stop the hole on technological break. Continue downloading the remaining volume of the gel-forming solution on the basis of the zeolite. Gel-forming solution is forced into the reservoir waste water volume equal to the volume of daily injection, then well stop on technological break. The gelation time of the first rim of the remaining amount calculated by the calculation formula. 2 C.p. f-crystals, 2 PL.

The invention relates to the oil industry, in particular to a method of limiting water inflow into the producing wells and the alignment of the profile in injection wells.

Known gel-forming composition to increase production of oil from heterogeneous reservoirs containing acrylic polymer of a number and a crosslinking agent (patent RF 2058479, IPC E 21 In 43/22, 20.04.96 year).

A disadvantage of the known technical solution is the low technological efficiency in the extraction of residual oil.

The closest in technical essence is a method of regulating the permeability needmore the acidity above the gelation threshold - in the first stage and the second stage pump the same solution with a concentration below the gelation threshold, additionally containing complexing additive (patent RF 2184841, IPC E 21 In 43/22, 10.07.2002,).

The disadvantage of this method is low efficiency due to the slightly lower permeability flushed zones of the formation.

The objective of the invention is to increase efficiency, reduce permeability of flooded high-permeability Sandstone reservoir by creating a durable gel units in the layer.

This task is achieved in that in the method of regulating the permeability of terrigenous reservoir by injection into the formation via the injection well a gelling solution based on zeolite and hydrochloric acid, gelling solution pump with adjustable gelation time and daily rims, and pick up the part, providing a gelation time of each previous rims for 1 day more than the subsequent, after the injection 40,0...90,0% of the volume of the gel-forming solution on the basis of zeolite and hydrochloric acid is injected daily gel-forming composition, and injection carry out successive fringes from the fibre or fabrics of polyacrylonitrile - Gaitan and fresh water; the fringe of fresh water and the rim of an aqueous solution of hydrochloric acid and an aqueous solution of hydrochloric acid, fresh water and hydrolyzed in alkali waste fibers or fabrics of polyacrylonitrile with fresh water served at a ratio of 2:1:2, then gelling the composition pushes the waste water and stop well on technological pause after technological pause upload daily fringes of the remaining volume of the gel-forming solution on the basis of zeolite and hydrochloric acid, and again push the waste water, and the gelation time of the first rim of the remaining amount calculated by the formula

t= (1-M/100)V/q+0,5,

where t is the gelation time of the first rim remaining, day;

M=40...90% of the volume pumped gelling solution, %,

V is the total volume of the injected gel-forming solution and the gel-forming composition, m3,

q - the amount of daily injection of gel-forming solution, m3/day.

Daily gel-forming composition is injected amount equal to 5...50q. Gel-forming composition and gelling the solution pushes the waste water volume equal to the daily volume geleobrazovaniju in alkali waste fibers or fabrics of polyacrylonitrile taking into account the laws of gelation facilitates the rapid formation on the day of injection volume barrier, shut pumped volume of the gel-forming solution on the basis of zeolite and hydrochloric acid from the injection wells. Gel barrier on the basis of alkali-hydrolyzed fibers or fabrics of polyacrylonitrile prevents filtration of the entire volume of the gel-forming solution on the basis of zeolite and hydrochloric acid in the "channels" through which the injected water breaks through into the producing wells. Thus, the channel is “locked” at a given length and prevents removal of the gel-forming solution in a producing well, in case when the amount of injected gel-forming solution exceeds the volume of the pore space channels of water breakthrough at the production wells. When pumping the remaining volume of gel solution gel barrier causes it to be filtered in less permeable water-bearing zone of the formation, there is an increase in helium "body" in width and prevention dagger breakthrough gel in producing wells, thereby expanding the footprint of the proposed flow technology. This greatly increases the effectiveness of the proposed method of stimulation.

Zeolite is a mineral that contains oxides of silicon, sodium, aluminum, Kala is produced in accordance with GOST 857-88. It is an aqueous solution of hydrogen chloride (Hcl) with a concentration of 31.5-35,0% depending on the brand. Appearance clear, colorless, yellowish or yellow liquid.

Hydrolyzed in alkali waste fiber or fabric polyacryl-nitrile produced Ufa "Khimprom" beyond 49560-04-02-90 under the trade name "Gaitan", physico-chemical characteristics of which are given in table.1.

Examples of specific performance.

Example 1. Implementation of the proposed method was carried out on the hearth impact, including one injection and four production wells (layer IV). The injection capacity of the well is 400 m3/day. Effective saturated thickness of 8.4 meters water Cut wells - 94-97%, the average daily oil production rate is 3.0 to 5.7 m3/day. The consumption of reagents for processing amounted to 67.2 per ton zeolite, 250 m3hydrochloric acid (commodity form 24% concentration), 4.0 t Gaitana, 680 m3waste water.

The total volume injected gel-forming solution was 1000 m3volume one daily rims 100 m3. On the basis of specific volumes and taking into account the optimal concentrations of the components in the gel-forming solution calculated the CSOs gelling solution. Moreover, the gelation time of each previous rims for 1 day more than the subsequent. Therefore, the start time of the gelation 1 rims will be 8 days, the necessary flow of reagents: zeolite - 5.0 t, hydrochloric acid commodity form (24% concentration) to 18.6 m3and, given that daily fringe is 100 m3volume of wastewater will be 76 m3. The gelation time II rims will be 7 days, spent 5.5 tons of zeolite, 20.5 m3hydrochloric acid (24% concentration), the rest is water. The following volumes rims III, IV, V, VI, VII, VIII are also 100 m3from them the necessary flow of zeolite: 6,6 t (III b ), 6.7 tonnes (IV b), 6.8 t (V b), 7,0 t (VI b), 7,7 t (VII b), 7.9 (VIII b), trade (24%) form of hydrochloric acid: 24,6 m3for III rims, 24,9 m3for IV rims, 25.3 m3for V rims, 26,0 m3for VI rims, 28,6 m3for VII rims and 29.4 m3for VIII rims. Thus, using the specified volumes of reagents for injection daily rims can improve the effectiveness of the proposed method by regulating the time of gelation and the simultaneous formation of bulk gel in situ.

After sociopathology composition, consisting of five successive rims: 10 m3aqueous hydrochloric acid solution with a mass concentration of 15%; 5 m3fresh water; rims, containing 3 t Gaitana and 17 m3fresh water; 5 m3fresh water and 10 m3aqueous hydrochloric acid solution with a mass concentration of 15%. This amount of daily gel-forming composition is 50 m3with a ratio of 2:1:2 volumes rims aqueous solution of hydrochloric acid, fresh water and Gaitana with fresh water. In the injection of this gel-forming composition, the formation of the barrier, which enables you to securely maintain the bottomhole zone of wells without contamination of the gel-forming solution on the basis of zeolite and hydrochloric acid. Then carry out the displacement of waste water of 100 m3. Well stop on technological pause for 24 hours.

After technological pause continue to pump daily fringes of the remaining 150 m3gel-forming solution on the basis of zeolite and hydrochloric acid. Moreover, the gelation time of the first rim of the remaining volume is t=(1-80/100)1000/100+0,5=2,5 days. Download 7 t zeolite, 26 m3commodity hydrochloric acid (24%) and 67 m3the country: Russia>waste water.

Gel-forming solution is forced into the reservoir 100 m3waste water. Then well stop on technological pause.

In the application of the method decreased water cut crude production wells from 18 to 65. Additional production was 12820 tons of oil.

Example 2. The object of the tests on the prototype - hearth, presented as a single injection and four producing wells, operates inhomogeneous layer, stacked Sandstone reservoirs with permeability of 0.21 μm2, porosity is 0.22. The injection capacity of the well is 145 m3/day, production watercut wells - 93-96%. The average daily oil output of 1.1-2.8 t (average value of 1.9 t).

In injection well pump 16 m38% solution of nepheline 8% hydrochloric acid, forced into the reservoir 30 m3waste water (density 1118 kg/m3and stop the reaction for 4 days. Then pumped into the reservoir 60 m3acid solution containing 1% of nepheline and 0.5% synthetic acetic acid 5% hydrochloric acid, and then continue to discharge waste water from the system reservoir pressure maintenance.

In resulto oil on average per well has increased by 0.55 tons/day, i.e. by 28.9%.

Reviewing key performance centers of influence as by a known method, and the proposed (table. 2), we can conclude that the proposed impacts observed a significant reduction in water cut crude production wells, which entails a reduction of the permeability of the flooded area of the reservoir, the oil production increase site exposure and increasing oil recovery.

The most suitable sites for impacts of the proposed method are the oil fields with heterogeneous Sandstone reservoirs located on the middle or late stages of development.

1. The method of regulating the permeability of terrigenous reservoir by injection into the formation via the injection well a gelling solution based on zeolite and hydrochloric acid, wherein the gel-forming solution pump with adjustable gelation time and daily rims, and select the composition of the gelling solution, providing a gelation time of each previous rims for 1 day more than the subsequent, after the injection 40,0...90,0% of the volume of the gel-forming solution on onetrack aqueous solution of hydrochloric acid; the rim of fresh water; the rim hydrolyzed in alkali waste fibers or fabrics of polyacrylonitrile - Gaitan and fresh water; the fringe of freshwater and again the rim of an aqueous solution of hydrochloric acid and an aqueous solution of hydrochloric acid, fresh water and hydrolyzed in alkali waste fibers or fabrics of polyacrylonitrile served when the mixing ratio 2:1:2, then gelling the composition pushes the waste water and stop well on technological pause after technological pause upload daily fringes of the remaining volume of the gel-forming solution on the basis of zeolite and hydrochloric acid, and again push the waste water, thus the gelation time of the first rim of the remaining amount calculated by the formula

t=(1-M/100)V/q+0,5,

where t is the gelation time of the first rim remaining, day;

M = 40...90% of the volume pumped gelling solution, %;

V is the total volume of the injected gel-forming solution, m3;

q - the amount of daily injection gelling restorati, m3/day.

2. The method according to p. 1, characterized in that daily gel-forming composition is injected amount equal to 5...50q.

indicate the waste water volume, equal to the daily volume of gel-forming solution on the basis of zeolite and hydrochloric acid.



 

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