Method for non-uniform oil reservoir development

FIELD: oil industry, particularly non-uniform reservoir development.

SUBSTANCE: method involves injecting isolation composition namely Portland cement dispersion and water-soluble polymer in well, wherein the components are taken in proportion of 1:(0.01-0.5) in oil-bitumen product, 5-56 parts by weight of Portland cement and water-soluble polymer are taken for 100 parts by volume of said dispersion; injecting aqueous Portland cement solution along with said dispersion, wherein the solution is taken in proportion of (0.1-0.5) per 1 part of said dispersion.

EFFECT: increased efficiency of stacked oil pool development and highly-permeable watered reservoir zones isolation.

2 cl, 3 tbl, 3 ex

 

There is a method of designing heterogeneous permeability oil reservoirs under the patent of the Russian Federation No. 2158824, CL EV 43/22, 10.11.2000, including injection into the reservoir suspension of water-soluble polymer in the formation of highly mineralized water.

The disadvantage of this method is low efficiency due to degradation of the polymer in highly dispersive medium and clogging of outlet openings, oil saturated intervals particles of partially hydrolyzed polymer.

There is a method of developing a heterogeneous oil reservoirs (RF patent No. 2186938, CL EV 43/22, 33/138, 2002), including the injection of insulating composition containing natural bitumen obtained in-situ burning, and containing up to 10% of water and filler - xerogel.

The disadvantage of this method is inefficient due to low stability of dispersion of Aerosil or aerogel (used as xerogel) in natural bitumen in terms of irrigated high-permeability formations.

The closest in technical essence and the achieved result is a way to develop heterogeneous oil reservoirs (RF patent No. 2140529, CL EV 43/22, 1999), including injection into the reservoir oil and bitumen product extracted from production wells production of heavy oils and bitumens of different and physico-chemical methods - vapor, steam, in-situ combustion, the injection of chemicals or solutions with chemicals or polymers or hydrocarbon solvents, which are used finely ground materials (mineral powders, atactic propylene, chalk, carbon black, epoxy resin, plastic, rubber, sulphur, and others), powdered polyacrylamide, lignosulfonate, hydrocarbon solvents (waste absorbent, isopropanol and others), surfactants (AF-(6-12), OP-10, petroleum sulfonates and others), alumoxane and other

The disadvantage of this method is the necessity of mechano-chemical activation solution of finely ground materials etc product, which is a necessary condition for the effective application of the composition. The activation process is a deterrent to the implementation of the technology, as should be done in energonaprjazhenie mechanisms (for example, planetary mills)related to hazardous industrial facilities and not having industrial applications.

The aim of the proposed method is to increase the efficiency of the method of development of heterogeneous oil reservoirs based on oil and bitumen product in real heterogeneous permeability oil reservoirs by increasing structural-mechanical properties Zack is shivamoga in the layer structure.

This objective is achieved in that in the method of developing heterogeneous oil reservoirs, including the injection of insulating composition on the basis of oil and bitumen product, as an insulating composition upload the variance of Portland cement and a water-soluble polymer in oil and bitumen product number 5-65 parts by weight of Portland cement and a water-soluble polymer, taken in a mass ratio of 1:(0.01 to 0.5) is 100 OBC specified variance.

This goal is achieved by the fact that in parallel or in series with the specified variance of the injected aqueous solution of Portland cement in a volume ratio (0.1 to 0.5):1 to the specified variance. When this plastic strength formed by the compositions is from 1.8 to 60.0 kPa.

The proposed method is based on the ability of high molecular weight components of the oil and bitumen product in the presence of water-soluble polymers and hydraulic binder is Portland cement in water-saturated intervals to form organo-mineral composition, adsorbiruyuschee on the surface of the breed and has high adhesion and strength properties.

From the oil-saturated zone dispersion of Portland cement and polymer in oil and bitumen product taken out of the reservoir oil.

For implementing the method use: technical products industry is using in large quantities. For example, water-soluble polymers of acrylic acid number (PAA on THE 6-16-2531-81, THE 6-01-1049-81, PDA-1020, CS-6, the Pusher 500 and others), water-soluble cellulose ethers grade Alfacell and other

The essence of the invention consists in the following. Into the formation via the production well pump variance of Portland cement and a water-soluble polymer in oil and bitumen product number 5-65 parts by weight of Portland cement and a water-soluble polymer, taken in a mass ratio of 1:(0.01 to 0.5) is 100 OBC specified variance. As fillers in the composition, if necessary, impose more of the same ingredients (chemicals, hydrocarbon solvents, and other), as in the method of the prototype. Concurrently or sequentially with the specified variance of the injected aqueous solution of Portland cement in a volume ratio (0.1 to 0.5):1 to the specified variance.

Example 1

Laboratory studies to determine the effectiveness of the water shut-off high permeability washed zones of the formation of the proposed method was performed on a layer-by-layer inhomogeneous model of oil reservoir, a section of 100 mm and a length of 2000 mm, consisting of highly permeable (1500-2000 MD) and low permeability (150-200 MD) zones separated by an impermeable membrane and connected to a single pressure vessel. The required values of permeability was achieved by the degree of grinding disintegrated core real months is orogeny.

Then through the model consistently implemented filtering of produced water, the model oil and injected water in an amount of 5 pore volumes (Vp) each. Simulated conditions close to real for multilayer oil deposits at the late stage of development.

Next I downloaded the insulation composition according to the invention in amounts of 0,2Vp.

The results of the experiments are given in table 1.

As follows from table 1, the application of the proposed method can improve the insulation of high-permeability layers in comparison with the prototype by 12-27% while reducing the water content of selected liquid 59-93%.

From the data in table 1 it follows that using the proposed method improves the quality of isolation of high-permeability layers. So the pressure break fluid on the high-permeability formation in experiment 1 is less than 1.7 MPa/m, and in experiment 3*-7* - 5,9-to 13.2 MPa/m ceteris paribus. Parallel or sequential injection of an aqueous solution of Portland cement in a volume ratio (0.1 to 0.5):1 to dispersion of Portland cement and a water-soluble polymer in oil and bitumen product increases the value of this indicator to the values of 6.7-15.0 MPa/m smaller (0,05:1) or large (0,6:1) ratio is impractical due to the lack of breadboard is th effect of the application of an aqueous solution of Portland cement and stronger clogging low-permeability oil-saturated layers.

Example 2

Efficiency of method development in conditions of nonuniform permeability of the layers was determined by the increase of the coefficient of oil displacement in linear hydrodynamically linked models of petroleum formation permeability, connected to one of the pressure container. At the output of the models kept the pressure that provides the most permeable bed filtration rate at the level of the real reservoir (not more than 1 m/day). Used model length of 1.16-1.20 m, the cross-sectional area of 1.00 and 1.35·10-4m2, porosity of 0.29 to 0.33%filled disintegrated core real fields.

59
Table 1
no experienceCompositionConcentration, wt.%The volumetric ratio of the aqueous solution of Portland cement and dispersion of Portland cement and a water-soluble polymer in oil and bitumen productThe sequence of injection of an aqueous solution of Portland cement and dispersion of Portland cement and a water-soluble polymer in oil and bitumen productInsulating properties, %Reduce wateringPressure break, MPa/m
you ECOPOLICY interlayer low-permeable interlayer
123456789
The way the prototype
1Etc product
Polymer5--73839<1,7
IPV (mech.-chem. act.).10
The proposed method
2Etc productof 0.05:1serial822,655the 5.7
Polymer: Portland 0,01:15
3Etc product--852,55,9*
Polymer: Portland 0,01:150,1:1serial872,3656,7
4Etc product--892,3679,6*
Polymer: Portland 0,03:1200,2:1parallel912,26910,0
5Etc product--922,17510,3*
Polymer: Portland 0,05:1350,3:1serial952,07910,8
6Etc product--971,78312,4*
Polymer: Portland 0,10:1500,4:1parallel991,68613,5
7N is habitancy product --991.38813,2*
Polymer: Portland 0,50:165of 0.5:1serial1001,29315,0
8Etc product0,6:1serial1001,69114,7
Polymer: Portland 0,50:165
*) - injection dispersion of Portland cement and a water-soluble polymer in oil and bitumen product without an aqueous solution of Portland cement

The oil located in the models, squeezed water oil fields to achieve full water content (up to 99%) of selected products. Then in pairs model was introduced dispersion of Portland cement and a water-soluble polymer in oil and bitumen product (5-65 parts by weight of Portland cement and a water-soluble polymer, taken in a mass ratio of 1:(0.01 to 0.5), and 100 OBC specified dispersion) and an aqueous solution of Portland cement (commonly used In a/C, e.g. the, 0,5) in a volume ratio (0.1 to 0.5):1 to the specified variance.

The injection solutions were made simultaneously or sequentially rims to align conductivity raznoprofilnyh zones. Then resumed pumping the water. Determined the increase of the coefficient of oil displacement as the difference between end of oil displacement efficiency when using the inventive method and the displacement coefficient in water to achieve 99%of the water content of the extracted oil.

The research results are summarized in table 2.

According to table 2 shows that the application of the proposed method in the development of oil fields can significantly increase the oil recovery factor 21.8-29.0% as compared with the known method.

Example 3.

Handled well, operating carbonate sediments, lying at a depth of 1264,2-1273,2 meters liquid Flow at the time of implementation of the method was 16.0 m3/day oil - 0.1 tons/day, the water content was 99.4%.

In the well was pumped 13.6 m3dispersion of Portland cement and a water-soluble polymer, taken in the ratio of 1:0.06 to, and pushed 6 m3formation water. For the preparation of compositions used 4,32 tons of Portland cement and 0.260 t water-soluble polymer (polyacrylamide).

The pressure at the beginning of the injection (PH) was 4.1 MPa, at the end of produce (RK) And 8.6 MPa, which indicates the size of the state waterproofing composition working in highly permeable fractured zone of the reservoir (1264,2-1266,4 m).

Table 2
№№ p/pThe volumetric ratio of the aqueous solution of Portland cement and dispersion of Portland cement and a water-soluble polymer in oil and bitumen productThe method of injectionPermeability models, the components of the layer, μm210-3The growth rate of oil recovery compared to the prototype, %
10,1:1synchronous/

serial
3547

2625
21,8/22,3
20,2:1synchronous/

serial
3627

1329
25,4/25,0
30,3:1synchronous/

serial
4193

1846
26,5/27,1
40,4:1synchronous/

serial
1937

926
28,7/28,9
5of 0.5:1synchronous/

serial
2618

1274
29,0/28,5

Next, the well is closed in response to 24 hours.

After the expiration of the time required for the formation of the insulating layer composition, the well is put into operation. Pairs of the format works well for the months shown in table 3.

Table 3
MonthThe oil production rate, tWater cut wells, %
110,5634
210,2436
39,1243
48,845
58,4847
68,3248
77,6852
87,255
94,9669
104,4872
11475
123,6877

The table shows the result of field experiment is achieved as the shutoff of the high-permeability water-saturated areas of the reservoir as a result of their isolation, and increase the productivity of wells for oil 3.5-10.5 tons per day. For the 12 months well received additional oil production in the amount of 2589,6 tons of oil.

1. The way to develop heterogeneous oil reservoirs, including the injection of insulating composition on the basis of oil and bitumen p is oduct, characterized in that the insulation composition of the obtained dispersion of Portland cement and a water-soluble polymer in oil and bitumen product number 5-65 parts by weight of Portland cement and a water-soluble polymer, taken in a mass ratio of 1:(0.01 to 0.5), and 100 OBC specified variance.

2. The method according to claim 1, characterized in that in parallel or in series with the specified variance of the injected aqueous solution of Portland cement in a volume ratio (0.1 to 0.5):1 to the specified variance.



 

Same patents:

FIELD: underground well repair, particularly methods to create behind-casing screen in productive reservoir of oil, water and gas wells.

SUBSTANCE: method involves injecting foamed polymeric solution including water-soluble polymer in amount of 1.5-2.5 % by weight, foaming agent in amount of 1-3% by weight, cross-linking foam stabilizing agent in amount of 0.2-0.6% by weight and water in bottomhole formation zone; injecting porous plugging composition including cement grout with 0.3-0.5 water-cement rate taken in amount of 60-80% by weight, above mentioned foamed polymeric solution in amount of 20-40% by weight in bottomhole formation zone. Each of said solutions is characterized by viscosity η and yield point τ change during injection and cross-linkage thereof.

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8 cl, 4 tbl, 5 dwg, 1 ex

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20 cl, 5 ex, 3 tbl

FIELD: oil and gas production industry, particularly to treat bottomhole formation zone during oil and gas production.

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FIELD: petroleum industry; natural gas industry; methods of isolation of the productive strata overlapped by the casing strings and the grouting mortar for its realization at the productive strata overhaul repair.

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2 cl, 2 dwg, 1 tbl

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1 tbl

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2 tbl

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3 cl, 3 tbl, 34 ex

FIELD: gas and oil production industry.

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6 tbl, 1 ex

FIELD: gas and oil production industry.

SUBSTANCE: invention relates to chemical composition used in treatment of holes, among them, absorbing holes, for decreasing the content of hydrogen sulfide in gaseous space in carrying out repairing, research and other works, and can be used in gas and oil production industry under conditions of normal and low seam pressures. Proposed composition comprises the following components, wt.-%: sodium peroxocarbonate, 10-40; surfactant (surface-active substance), 0.5-10; polyacrylamide, 0.02-0.1; sulfamic acid, 17-53, and sodium nitrite, 21-52. The slid-phase composition can comprise water glass also. Invention provides development of effective and simple in preparing and technological composition used for neutralization of hydrogen sulfide in holes.

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2 cl, 7 tbl, 2 ex

FIELD: oil and gas extracting industry.

SUBSTANCE: invention relates to damping holes in their overhaul repair. Proposed technological liquid used in damping oil and gas holes comprises the following components, wt.-%: microbial xanthane biopolymer, 0.5-2.0; modified starch, 0.2-2.5; surfactant (surface-active substance), 0.01-0.2; sodium carbonate, 0.1-1.0; aluminum power, 0.005-0.08, and water, the balance. Method for preparing indicated aphron-containing technological liquid used in damping oil and gas holes involves mixing its components to obtain two solution wherein one solution contains sodium carbonate and surface-active substance obligatory, and other solution contains aluminum powder. Mixing these solution is carried out at temperature from 50°C to 90°C. Invention provides preparing aphron-containing liquid for damping under static conditions without using special gas-dispersing equipment and based on available reagents.

EFFECT: improved and valuable technical properties of liquid.

2 cl, 3 tbl, 3 ex

Grouting mortar // 2322471

FIELD: gas and oil industry.

SUBSTANCE: invention relates to grouting mortars used in cementing casing strings in gaseous, gas-condensate or petroleum holes in zone of productive seam at moderate temperatures. Proposed grouting mortar comprises the following components, wt.-%: grouting Portland cement, 64.41-66.24; sulfacell, 0.13-0.40; microsilica MK-85, 0.33-1.99, and water, 33.20-33.30. Invention provides preparing grouting mortar of reduced water yield in face conditions and with simultaneous enhance of strength of cohesion of cement stone with a casing string.

EFFECT: improved and valuable properties of grouting mortar.

1 tbl, 1 ex

FIELD: organic chemistry, chemical technology.

SUBSTANCE: invention relates to synthesis of unknown early N-[alkylphenoxypoly(ethyleneoxy)carbonylmethyl]-morpholinium chlorides. Invention proposes novel compounds - N-[alkylphenoxypoly(ethyleneoxy)carbonylmethy]-morpholinium chlorides of the general formula: wherein R means aliphatic hydrocarbon radical comprising 8-12 carbon atoms; n means an average degree of oxyethylation equal to 3, 6, 7, and a method for synthesis of these compounds. Synthesized compounds possess property of inhibitors of asphalt-resin-paraffin deposits and can be used in oil industry for prevention of precipitation of asphalt-resin-paraffin deposits from the oil in its extraction, preparing and transporting.

EFFECT: improved and valuable properties of compound.

2 tbl, 7 ex

FIELD: oil production, particularly to block bottomhole reservoir zone and to kill gas well drilled in highly-permeable productive reservoir, as well as well workover.

SUBSTANCE: method involves serially injecting blocking liquid and killing liquid in bottomhole reservoir zone. Blocking liquid is magnesium hydrogel comprising microshperes added in proportion of 10:4. Microsphere dimensions are selected to provide total bottomhole reservoir zone mudding and following microsphere flushing-out from bottomhole reservoir zone.

EFFECT: increased efficiency of reservoir blocking and gas well killing along with reservoir rock property retention and decreased well workover costs.

FIELD: oil production, particularly to block bottomhole reservoir zone and to kill gas well drilled in highly-permeable productive reservoir, as well as well workover.

SUBSTANCE: method involves serially injecting blocking liquid and killing liquid in bottomhole reservoir zone. Blocking liquid is magnesium hydrogel comprising microshperes added in proportion of 10:4. Microsphere dimensions are selected to provide total bottomhole reservoir zone mudding and following microsphere flushing-out from bottomhole reservoir zone.

EFFECT: increased efficiency of reservoir blocking and gas well killing along with reservoir rock property retention and decreased well workover costs.

FIELD: oil and gas production.

SUBSTANCE: invention relates to treatment of drilling fluids prepared using industrial-grade potassium chloride products produced according to GOST4568-95. Reagent for treating drilling fluids contains industrial-grade potassium chloride product together with anti-conglomeration reagent, namely aliphatic C16-C20-amines, added thereto during production. Reagent is composed of 75% orthophosphoric acid, 22.76-63.88%, double superphosphate, 18.06-38.62%, and water. In a method of preparing such reagent, double superphosphate is stirred in water at 1:1 ratio for 2-4 h at 40-50°C to form mixture, which is cooled to 20-30°C, and after addition of orthophosphoric acid vigorously stirred.

EFFECT: enabled preparation of sedimentation-stable compositionally uniform high-efficiency reagent preventing release of ammonia from drilling fluids and extended assortment of reagents for controlling drilling fluids.

2 cl, 1 tbl

FIELD: production and exploratory well drilling, particularly foaming drilling fluids used during penetration through incompetent rock intervals and during primary productive oil and gas deposit opening in the case of abnormally low formation pressure.

SUBSTANCE: foam composition comprises surfactant, foam stabilizer, water, water hardness control additive and lubricant. The water hardness control additive is sodium silicate. The lubricant is VNIINP-117 emulsion. The foam stabilizer is polyacrylamide, the surfactant is sulphonole. All above components are taken in the following amounts (% by weight): sulphonole - 0.8-1.5, sodium silicate - 0.2-0.5, polyacrylamide - 0.1-0.5, VNIINP-117 - 0.5-2, remainder is water.

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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