Formation permeability control method

FIELD: oil and gas industry.

SUBSTANCE: in formation permeability control method involving subsequent pumping to the well through separating bank of fresh water or oil, liquid wastes of produced zeolites and gel formation initiator, forcing-through of pumped reagents to formation with waste water or oil, the solution of by-product of produced polyethylenepolyamines - reagent of ammonium chloride is used as gel formation initiator.

EFFECT: reducing corrosive activity of composition; increasing technological efficiency for restriction of water and gas breakthrough.

4 ex, 2 tbl, 1 dwg

 

The invention relates to the oil industry, in particular to a method of regulating the permeability of the reservoir, restrictions breakthrough of water and (or) gas in oil wells and the alignment of the profile in injection wells.

There is a method of developing oil deposits, which consists in injecting into the formation through the well emulsionable rims, gelling rims and again emulsionable rims (RF patent No. 2094601, EV 43/22, publ. 27.10.1997). The disadvantage of this method is the low technological and economic efficiency.

The closest to the technical nature of the claimed method is a method of regulating the permeability of the reservoir, including the injection into the formation via the injection or production well separating the rim, working agent, and then separating the rim and pushing uploaded reagents, as a working agent use a liquid waste product of zeolite - mother solution of zeolite and an aqueous solution of a strong acid, and pumped the mother liquor zeolites separate rim or injected simultaneously or sequentially mother liquor zeolite with an aqueous solution of a strong acid, as separating the rims use fresh water, and as podavlivaya fluid use of waste water (p is the tent of the Russian Federation No. 2262584, EV 33/138, EV 43/32, publ. 20.10.2005).

The disadvantages of this method are: the use of corrosion-active agents - strong acids - and not enough high technological effectiveness of the regulation of the permeability of the reservoir.

The invention aims: reducing the corrosiveness of the composition, increase technological efficiency to limit water breakthrough and (or) gas.

This task is achieved in that in the method of regulating the permeability of the reservoir, including sequential injection into the well, through separating the rim of fresh water or oil, liquid waste zeolites and initiator of gelation, punching uploaded reagents in the formation of waste water or oil, as the initiator of the gelation solution is pumped by-product of polyethylenepolyamine - reagent OKHA, and the volume ratio of liquid waste zeolites and 10%reagent solution OKHA is 3...4:1.

As liquid waste zeolites use solutions uterine MP-X MP or-Y, THE 2163-11805766575-2004 (see table 1). Solutions uterine Mr-X and MP-Y are alkaline environment (pH of about 12%).

Table 1
Technical characteristics of the solutions uterine Mr-X, MP-Y
Name of indicatorMr XMP-Y
Appearanceweakly turbid liquid, Pets presence of fine suspended solids (turbidity)
Mass concentration of sodium sulfate, g/DM3withinnot definedfrom 35 to 85
Mass concentration of silicon oxide (IV), g/DM3withinfrom 10 to 15from 40 to 80
Mass concentration of sodium oxide, g/DM3withinfrom 35 to 45from 25 to 40

As the initiator of gelation using a byproduct of the production of polyethylenepolyamine - reagent OKHA on THE 6-00-5751766-2-88, a powder from yellow to light brown. Technical characteristics of the reagent OKHA are given in table 2.

Value
Table 2
Technical characteristics of the reagent OKHA
Name of indicator
Mass fraction of ammonium chloride, %, not less than85
Mass fraction of moisture, %, max10
The measure of hydrogen ions (pH) 20% aqueous solution6±1

As separating rims use of fresh water density of 1000 kg/m3according to GOST 2874-82 or oil GOST 51858-2002.

As the squeezing of the liquid used waste water density 1100-1180 kg/m3or oil.

The use of reagent OKHA, the proposed method allows to reduce the acidity of the environment, because 10-20%aqueous solutions of the reagent OKHA have a pH of 6-7, in contrast to aqueous solutions of strong acids (pH 1), used in the known method.

Reagent OKHA enhances the hydrolysis of sodium silicate, found in solutions uterine MP-S, MP-Y, reducing the pH of the last from 12 to 10, which ensures the formation of insoluble silicic acid:

The latter is capable of polymerization and the formation of bulk gel, shielding breakthrough of water or gas producing wells.

The ability of the reagent OKHA to initiate gelation solutions uterine MP-S, MP-Y investigated in laboratory conditions.

Mixing of the components occurs MH is public education a rich gelatinous precipitate. As a result of laboratory studies (see figure) found that the largest amount of sediment (100%, 80%) is produced by the interaction of the solutions uterine (respectively MP-Y, Mr X) and a 10%aqueous solution of OKHA during their three-dimensional relationships 3...4:1.

The effectiveness of the proposed method is estimated to reduce the permeability of the formation model when filtering working agent. As the reservoir model used bulk core of quartz sand with a length of 300 mm, diameter 50 mm, the Initial permeability of the core is selected by changing the fractions of sand. Saturation and determining the permeability of the reservoir model (start and end respectively To1and K2) is performed for filtering waste water density 1100-1180 kg/m3. The pressure drop remains constant.

The effect of isolation is calculated as follows:

Example 1. Bulk core is saturated waste water density 1100 kg/m3determined by its initial permeability, then, between the separation of the rim of fresh water, pumped 40 ml uterine Mr-X and 10 ml of 10%aqueous solution of the reagent OKHA. Carry out punching uploaded reagents waste water. Filtering stop for 24 hours to respond, then determine the permeability and calculate the effect of isolation. He is 96%.

Por what measures 2. The core is saturated waste water density of 1180 kg/m3determined by its initial permeability, then, between the separation of the rim of fresh water, sequentially inject the solution uterine MP-Y and 10%reagent solution OKHA when the volume ratio of 3:1. After jacking reagents waste water core is left for 24 hours to respond. Subsequent filtering the waste water through the core is significantly reduced. The high isolation effect (99,6%) due to the formation of larger seal of the gel due to the higher content in the solution uterine MP-Y gelling component - SiO2(40-80 g/DM3), compared with the solution of the fallopian Mr X. By a known method cannot achieve the effect of isolation above 95.3 per cent, which is below the proposed method (99,6%).

The proposed method of regulating the permeability of the formation by conventional technological methods and technical means used in the construction, maintenance and operation of producing wells.

Technology method of regulating the permeability of the reservoir to limit water production (breakthrough gas) in oil wells and the alignment of the profile in injection wells is characterized by its simplicity. For this purpose, after the preparatory work, the well pumped sequentially, che is ez split rim, solutions uterine MP-X MP or-Y and 10%reagent solution OKHA. Next, perform the punching composition from the wellbore into the formation of waste water or oil, and conduct technology exposure for 24 h Then the well is put into operation.

In practice, the method is implemented as follows.

Example 1. The object of exposure is the injection well, in which perforated Sandstone terrigenous Devonian (D). Effective saturated thickness of the formation is 7.4 m permeability of the formation varies from 0.12 to 0.85 μm2. The density of the injected water is 1100 kg/m3. The injectivity of the reservoir when the pressure of the water pump 10 is 320 MPa m3/day. Technological efficiency is determined by the 5 surrounding oil wells. The cut oil wells varies from 78 to 98%, the average daily oil production rate from 0.8 to 5.4 tons/day.

In the specified hole through the separating b - fresh water - consistently pumped 32 m3solution uterine Mr-S and 8 m3the 10%reagent solution OKHA. Technological exposure is carried out within 24 hours production Watercut in the surrounding oil wells as a result of implementation of the proposed method decreased by 20-40%.

The proposed method is also applied in producing wells to perfo is exporting oil and gas, gas or oil deposits, to prevent breakthrough of the gas (the education of the gas cone) or limit the flow of water, i.e. improve the reliability of blocking the gas-saturated part of the reservoir from the oil-saturated or water-saturated part of the reservoir from the oil. Or to eliminate cross-flows of gas or water coming from above or underlying layers of leaky cement ring.

Example 2. Target for the proposed method is producing well. Effective saturated thickness of the formation is 19,0 m Buffer pressures up to 14 MPa. Average daily oil production rate is 0.5 t/d water cut wells was 2.0%. After determining the injectivity of the productive formation into the borehole sequentially via buffer - oil pump 24 m3solution uterine MP-Y and 8 m3the 10%reagent solution OKHA. The bursting of the reagents in the reservoir is realized by the oil. After the process of aging well at responding within 24 h buffer pressure decreased to 0.3 MPa, about 40 times. Average daily oil production rate increased to 0.9 tons/day twice, in the complete absence of water in crude production.

The known method is tested in a production well. The buffer pressure is 12 MPa. Average daily oil production rate is 0.4 tons/day. In the well after vetelino, buf oil pump 12 m3solution uterine MP-Y and 12 m3hydrochloric acid solution. Carry out punching reagents in the reservoir and technological shutter speed to react within 24 hours After the start of the well buffer the pressure decreased slightly and amounted to 8 MPa. Average daily oil production rate has not changed (0.4 tons/day).

Thus, the proposed method allows you to adjust the permeability of the formation in the injection wells, as well as to reduce production watercut or significantly limit gas breakthrough at the production wells.

The method of regulating the permeability of the reservoir, including sequential injection into the well through dividing the fringe of fresh water or oil, liquid waste zeolites and initiator of gelation, punching uploaded reagents in the formation of waste water or oil, characterized in that as the initiator of the gelation download solution a by-product of polyethylenepolyamine - reagent OKHA, and the volume ratio of liquid waste zeolites and 10%reagent solution OKHA is 3-4:1.



 

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1 ex

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21 cl, 9 ex, 16 tbl, 5 dwg

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1 ex, 1 dwg

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3 cl, 3 tbl, 1 ex, 3 dwg

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2 cl, 1 tbl, 24 ex

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24 cl, 4 ex

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24 cl

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2 cl

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3 cl, 2 tbl, 2 ex, 1 dwg

FIELD: oil and gas industry.

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4 cl, 3 ex

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12 cl, 2 tbl, 8 dwg

FIELD: oil and gas industry.

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16 cl, 15 ex, 15 dwg

FIELD: process engineering.

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EFFECT: higher efficiency of reducing friction.

23 cl, 1 ex, 3 tbl

FIELD: chemistry.

SUBSTANCE: liquid composition contains the following: suspension on oil basis, which includes base oil, organophilic clay, polar activating agent, wetting agent, and composition improving the operability in winter conditions, which contains one or many composite monoesters of polyols and/or composite diesters of polyols. Composition is meant for hydraulic fracturing of underground formation, removal of combined wafer from productive underground formation. Hydraulic fracturing method of underground formation involves pumping to the formation under the pressure which is enough for fracturing, liquid for fracturing, which contains propping agent and suspension on oil base, which includes base oil, organophilic clay, polar activating agent, wetting agent and the above composition, or according to the other version - fracturing liquid containing the above suspension, and pumping to the formation subjected to fracturing under pressure which is enough for protection of cracks against joining of carrying liquid with propping agent. Production method involves circulation and/or pumping to production well of the liquid including the above suspension.

EFFECT: improving operability in winter conditions.

25 cl, 18 tbl, 3 ex, 4 dwg

FIELD: oil and gas production.

SUBSTANCE: invention provides a method of developing oil pool allowing production of oil from water-rich oil reservoir under difficult geological-tectonic conditions in the last development stage. In the method, neutral salt of carbonic acid and acid solution are forced into formation through injecting well with water generated in gas-liquid fringe created in formation. After pumping of neutral salt of carbonic acid, acid solution is pumped by portions alternating with water pumping. Before pumping of acid solution portions beginning by at least second portion, selective insulation of high-permeable formation intervals is performed. Aforesaid neutral salt of carbonic acid utilized is sodium carbonate aqueous solution or aqueous suspension of calcium carbonate and aforesaid acid solution is aqueous hydrochloric acid solution. Selective insulation of high-permeable formation intervals involves use of freshly prepared controllable viscoelastic composition containing water-soluble acrylic polymer, cross-linking agent, thermal stabilizer, surfactant, and water. Summary concentration of acid solution is determined from concentration of neutral salt of carbonic acid on the base of stoichiometric proportions.

EFFECT: increased efficiency of maintaining formation pressure and thereby oil recovery of formation due to leveled displacement front and reduced probability of the rupture of formation rock backbone, and simplified control of phase state of gas-liquid fringe by changing pressure of pumped acid solution portions.

8 cl

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