Method for blocking high-penetrable watered oil beds

IPC classes for russian patent Method for blocking high-penetrable watered oil beds (RU 2244820):

E21B43/32 - Preventing gas- or water-coning phenomena, i.e. the formation of a conical column of gas or water around wells

E21B33/138 -

Another patents in same IPC classes:

Composition for confinement of water inflow into well / 2244819

Composition is made up of 90.0-95.0% sodium silicate solution with concentration 1.36 g/cm³ and silica modulus 3.0, 3.0-8.0% alkali metal silicofluoride, 1.0-4.0% wood flour, and 1.0-4.0% triacetine. Composition can be used during repair operations on oil production stings, when disabling formations, and when confining water inflow.

Hydrophobic agent for treatment on bottom area of formation / 2244818

Bottom area of formation is treated with hydrophobic agent, in particular solution of ethylene/vinyl acetate copolymer expressed by general formula [-CH₂-CH₂-C(CH₃COO)H-CH₂-]_n, where n=7000-10000, in hydrocarbon solvent.

Method for isolating penetrable beds in a well / 2244803

Method includes pumping of portion of water-absorbing acryl polymer, exposure of it in a well, pumping of second portion of same polymer, tempered on fresh water with concentration 1-20%, buffer of fresh water dries up, and before and after pumping of second portion of water-absorbing polymer, tempered on hydrocarbon liquid with concentration 10-20%, buffer of hydrocarbon liquid is pumped in, besides, said 2-portion systems are pumped into well multiple times.

Method of insulating formation water inflow / 2244115

Invention relates to insulating formation water inflow in gas and gas condensate wells with the aid of coltubing techniques. In particular, flexible conduit is descended through the tube space of well operated under pressure to the bottom with the aid of coltubing installation. Latches on tube and annulus spaces are opened. Well hole is filled through flexible conduit with gas condensate. Grouting mortar is prepared in preparation block by mixing cement mortar with setting retardant and mortar flowability enhancer in a calculated amount needed to prevent formation water inflow. Further, flushing fluid, e.g. methanol, is pumped through flexible conduit in amount constituting 0.3-0.6 volume of flexible conduit. Annulus space is closed and grouting mortar is pumped through flexible conduit in amount required to fill well hole in interval of water-inflow part of formation. When grouting mortar in hole rises to specified height, tube space is closed and grouting mortar contained in flexible conduit is forced into water-inflow part of formation by in series pumped flushing fluid and displacing solution: for example first methanol in amount 1.0-1.3 volumes of flexible conduit and then gas condensate in required amount, which however does not exceed internal volume of flexible conduit, until grouting mortar begins being pumped in amount of 0.3-0.5 volumes of flexible conduit. Then tube and annulus spaces of well are opened and gas condensate begins being simultaneously pumped into tube and annulus spaces in order to prevent rise of grouting mortar therein above interval of the water-inflow part of formation. Thereafter, bottom of flexible conduit is raised by 1 m above indicated interval and excess of grouting mortar is cut and washed away with gas condensate passed through flexible conduit into tube space, where excess grouting mortar remains in fluid state. After cement setting expectation time, flexible conduit is descended to the top of cement column and tests the latter for strength applying 4.0-5.0 kN loading by means of injector of coltubing installation through flexible conduit. Finally, cement bridging is subjected to hydraulic pressurization and flexible conduit is removed from well.

The composition for the repair and waterproofing works in oil and gas wells / 2242606

The invention relates to the oil and gas industry, in particular for carrying out waterproofing works and fastening the near-well zone of the reservoir (PPP) oil and gas wells

Hydrophobic emulsion / 2241830

The invention relates to the oil industry, in particular to the compounds for waterproofing works, as well as killing fluids oil wells

The way to isolate the flow of formation waters in horizontal oil or gas well / 2235873

The invention relates to the oil and gas industry, in particular to isolate the flow of formation waters in horizontal wells

Way to isolate the ingress of water during drilling and device for its implementation / 2235190

The invention relates to the construction of wells, in particular to a method of isolation ingress of water during drilling

The way to isolate the flow of formation water into the well / 2232265

The invention relates to the oil and gas industry, in particular to the field of operation and maintenance of wells and isolate the flow of formation waters in the horizontal sub-horizontal and vertical wells with open or cased face, and with the shank filter on the bottom

The way to restore productivity and commissioning of idle oil and gas wells / 2231630

The invention relates to the oil and gas industry, namely, to restore the idle oil and gas wells with low reservoir properties and closely spaced oil-water or gas-contacts

Grouting composition / 2244804

Invention provides grouting composition intended for selective insulation of water inflows into wells, including those occurring under low-temperature and high-permeation oil reservoirs, as well as for suppressing lost-circulating zones and brine inflow zones. Composition including product of hydrolytic etherification of chlorine-containing phenyltrichlorosilane still residues with aqueous alcohol solution contains, more specifically, product obtained by hydrolytic etherification of 100 wt parts of indicated residues with 10-32,8 wt parts of 90-93% aqueous alcohol solution in presence of 10-40 wt parts of orthosilicic acid ethyl ester and, additionally, 15-35 wt parts of chlorine-containing phenyltrichlorosilane still residues at summary content of the two components 133.2-161.6 wt parts. Grouting composition may further contain up to 16.8 wt parts of polar solvent.

Method for isolating penetrable beds in a well / 2244803

Light-weight grouting mortar / 2244098

Invention relates to grouting mortars used for cementing casing pipes of gas, gas-condensate, and oil wells complicated by presence of formations with low hydraulic rupture pressure as well as presence of permafrost rocks. Light-weight grouting mortar contains 47.0-60.0% special-type cement, 6.6-11.8% clinoptilite as light-weight additive, and water. As a result, casing-pipe annulus incidents during boring and running wells are avoided owing to improved parameters of grouting cement, in particular increased sedimentation stability of mortar, dimensional stability and needed strength of cement stone at low positive and negative temperature in early hardening stages are achieved at simultaneous lowering of grouting mortar density.

Lightweight cement mixture / 2243358

The invention relates to the oil and gas industry and can be used in the cementing of oil and gas condensate wells

Plasticizer-accelerator setting and hardening of cement slurries "camphor-pa / 2242584

The invention relates to the oil and gas industry and can be used for cementing oil, gas, and gas condensate exploration wells

Compositions for grouting / 2241831

The way to eliminate complications in the well / 2241818

The invention relates to the elimination of complications in wells during construction, drilling, operation, repair, reconservation oil, gas and water wells

Combined reagent for aerated cement mortars / 2240421

The invention relates to materials used in construction of oil and gas wells and for the construction of non-autoclaved aerated concrete

Method of making lightweight cement slurry / 2239050

The invention relates to the oil and gas industry, and in particular to methods of preparation of cement slurries for cementing wells

Lightweight cement slurry / 2239049

The invention relates to the oil and gas industry, namely the cement slurries for cementing casing and install the liquidation cement bridges

Light-weight grouting mortar / 2244098

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping, in carrying liquid - waterless mixture of oil products containing waterless oil, of powder-like water-soluble polymer and connector in amount of 0.05-0.2% for mass of carrying liquid or 30-100% for mass of power-like water-soluble polymer, as said mixture a mixture of waterless oil and light oil products processed in relation 0.1:9.9-9.9:0.1 is used, and as connector - dry aluminum nitrate, chrome nitrate, iron nitrate, magnesium nitrate, barium nitrate, calcium nitrate or their mixtures.

EFFECT: higher efficiency.

2 tbl

The invention relates to the oil industry, in particular to a method of blocking to supply high-permeability oil reservoirs, alignment profiles injectivity of injection wells.

The known method of insulation layer (U.S. Pat. 2004772 of the Russian Federation, IPC 5 E 21 In 33/138, 1993), in which the binder is dissolved in the water use of polyacrylamide aqueous solution of chromium nitrate. The use of aqueous compositions for waterproofing works requires careful selection of the concentrations of the components depends on the start time of gelation after mixing the components.

There is a method of isolation of the water in the wells (A.S. 1421849 the USSR, MKI 4 E 21 In 33/138, 1988), in which the staple giana is used an aqueous solution of aluminium chloride. The disadvantage of this method is the high concentration of aluminium chloride (30%), which significantly increases the cost of schweinebraten.

There is a method of isolating the water in the well (U.S. Pat. 1797644 the USSR, MKI 5 E 21 In 33/138, 1993). The method involves the injection of water-soluble polymer and the clay component in powdered state in the carrier fluid, which use oil. The disadvantage of this method is that the clay is ineffective staple for the formation of three-dimensional structure of the gel-like high is a (PAA) due to adsorption of the moving parts of the swollen polymer. The adsorption process is reversible and under certain conditions will prevail reverse process - desorption, which will lead to the violation of the insulation screen.

Closest to the proposed method of blocking high permeability layers (U.S. Pat. 2176309 of the Russian Federation, IPC 7 E 21 In 33/138, 43/32, 1999). This method involves the application as a staple of the water-soluble polymer dry chlorides of polyvalent metals. The method comprises the injection into the carrier fluid mixture of anhydrous petroleum products containing anhydrous oil, powdered water-soluble polymer and a binder in a quantity of 0.05-0.2% by weight of the carrier liquid or 30-100% by weight poroshkoobraznogo water-soluble polymer.

The objective of the invention is to increase the efficiency of blocking permeable to supply oil reservoirs by increasing the stability and strength of waterproofing screen, as well as expansion of the range of chemicals used as staplers water-soluble polymers and liquid media.

Table 1
Nitrate	Solubility in water, g /100 g/ if a 1°C
Mg(NO₃)₂	75,1/25; 81,2/40
CA(NO₃)₂	soluble
VA(NO 3)₂	10,32/25; 14,3/40
Al(NO₃)₃·N₂O	65,3/25; 75,4/40
SG(NO₃)₃·N₂O	soluble
Fe(NO₃)₂·6N₂O	82/18; 87/52
Fe(NO₃)₂·9H₂O	87/25; 105/40

The problem is solved due to the fact that in method block to supply high-permeability oil reservoirs, including injection into the carrier fluid is a mixture of anhydrous petroleum products containing anhydrous oil, powdered water-soluble polymer and a binder in a quantity of 0.05-0.2% by weight of the carrier liquid or 30-100% by weight of powdered water-soluble polymer as the above-mentioned mixture, a mixture of anhydrous oil and light oil products, used in a ratio of 0.1:9,9-9,9:0,1, and as the staple is dry nitrate of magnesium, calcium, barium, aluminum, chromium, iron or mixtures thereof.

Studies on the patent and scientific literature has shown that such a set of essential features is new and not previously used, and this, in turn, allows to make a conclusion about the technical solutions according to the criterion of "novelty".

The effectiveness of the proposed method blocked the I to supply high-permeability oil reservoirs were tested in laboratory conditions on the linear reservoir models with artificial crack. The linear model of the reservoir was filled fraction of quartz sand (0.05-0.2 mm). Next, the model was evacuated, filled the reservoir with water, saturated with anhydrous oil, replaced oil technical water to oil displacement (modeled completely flushed areas).

In the washed model was pumped blocking composition containing anhydrous liquid carrier powdered water-soluble polymer and dry nitrate of the metals, in the amount of 20% of the pore volume of the model, and then resumed pumping industrial water. The criterion for evaluating the effectiveness of the proposed method is used to seal effect (η ) or the degree of isolation, which is determined on the basis of the data obtained during the test, calculated by the formula:

where K₀- permeability model of the formation prior to injection of the blocking material, μm²; K - coefficient of permeability of the formation model after injection of the blocking material, μm².

The results of the experiments are shown in table 2.

Table 2
no experience	The addition of nitrates of metals on the weight of the carrier liquid, %	The addition of water-soluble polymer on the weight of the carrier liquid, %	Bridging effect, %
1	-	0,1	to 58.1
2	0,01	0,1	64,3
3	0,05	0,1	70,5
4	0,10	0,1	76,4
5	0,15	0,1	82,1
6	0,20	0,1	84,1
7	0,25	0,1	88,7
8	0,01	0,2	to 78.3
9	0,05	0,2	82,1
10	0,10	0,2	85,7
11	0,15	0,2	for 91.3
12	0,20	0,2	a 94.2
13	0,25	0,2	95,0
Note: as nitrate used Al(NO₃)₃; similar results were obtained using CR(NO₃)₃·N₂O; magnesium nitrate, calcium nitrate, barium nitrate, Fe(NO₃)₂·6N₂O, Fe(NO₃)₂·N₂O or mixtures thereof as a carrier liquid is used a mixture of anhydrous Devonian oil and light oil, otrb is produced in a ratio of 1:1 (other ratios give similar results).

Thus, the optimum amount of metal nitrates can be considered of 0.05-0.2% by weight of the carrier liquid or 30-100% by weight of powdered water-soluble polymer.

Using the proposed method provides in comparison with known methods of increasing the stability and durability of waterproofing of the screen, which significantly improves the efficiency of blocking permeable rocks and, consequently, provides a longer turnaround mileage well. In addition, the proposed method extends the range of powdery staplers water-soluble polymers and liquid media.

Sources of information

1. Pat. 2004772 of the Russian Federation, IPC 5 E 21 In 33/138. Way isolation layer / Antiromance, Nckia (RF). No. 4930931/03; Claimed 23.04.91; Publ. 15.12.93. Bull. No. 45-46.

2. A.S. 1421849 the USSR, MKI 4 E 21 In 33/138. The method of isolation of the water in the wells / Rev, Higbee, Isconova and others (USSR). No. 4109751 / 22-03; Claimed 25.08.86; Publ. 07.09.88. Bull. No. 33.

3. Pat. 1797644 the USSR, MKI 5 E 21 In 33/138. The method of isolation of water in the well / Nevelsky, Mcclimon (USSR). No. 4915996/03; Claimed 05.03.91; Publ. 23.02.93. Bull. No. 7.

4. Pat. 2176309 of the Russian Federation, IPC 7 E 21 In 33/138, 43/32. The method of locking the high-permeability layers / Mhitarov, Grandora, Needitnow etc. (RF). No. 99124518/03; Claimed 23.11.1999; Publ. 27.11.2001. Bull. No. 33.

p num="28"> The method of locking to supply high-permeability oil reservoirs, including injection into the carrier fluid is a mixture of anhydrous petroleum products containing anhydrous oil, powdered water-soluble polymer and a binder in a quantity of 0.05-0.2 % by weight of the carrier liquid or 30-100 % by weight of powdered water-soluble polymer, characterized in that the above-mentioned mixture, a mixture of anhydrous oil and light oil products, used in a ratio of 0.1:9,9 - 9,9:0,1, and as the staple is dry nitrate of magnesium, calcium, barium, aluminum, chromium, iron or mixtures thereof.