Method for blocking high-penetrable watered oil beds

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 sulfate, chrome sulfate, iron sulfate, magnesium sulfate, copper sulfate or their mixtures, or their alums with common formula MIMIII(SO4)

.2
12H2O, where MI-Na,K,Pb,Cs,NH4, and MIII-Al,Cr,Fe,Mn.

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.

There is a method of isolation of the water in the wells (A.S. USSR 1421849, 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. The USSR 1797644, 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 of polyacrylamide (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. RF 2176309, IPC 7 E 21 In 33/138, 43/32, 1999). In this way the blocking high is permeable to supply oil reservoirs, including the injection mixture of anhydrous petroleum products - liquid-media - powdery water-soluble polymer and a binder, as specified mixture of anhydrous petroleum products use a mixture of anhydrous oil and light pyrolysis resin in a volume ratio of 9:1-1:9, and as a staple Supplement for additional dry chlorides of magnesium, calcium, barium, aluminum, copper, iron or mixtures thereof in amounts of 0.05-0.2% by weight of the carrier liquid or 30-100% by weight of powdered 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.

This object is achieved 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 Nefteprodukt is, worked in the ratio of 0.1:9,9-9,9:0,1, and as a staple - dry aluminum sulfate, chromium, iron, magnesium, copper, or mixtures thereof, or alum with the General formula MIMIII(SO4)2·12H2O, where MI-Na, K, Pb, Cs, NH4and MIII- Al, Cr, Fe, and Mn (table 1).

Table 1
Metal sulfateSolubility in water, g /100 g/ 1°C
Al2(SO4)338,5/25; 38,9/30
Al2(SO4)3·(NH4)2SO4·24N2O9,19/25; 10,94/30
Al2(SO4)3·To2SO4·24N2O7.23 percent/25; 8,39/30
CR2(SO4)3·(NH4)2SO4·24N2O- 15,7/40
CR2(SO4)3·To2SO4·24N2Osoluble
CR2(SO4)3·N2O64/25;-
FeSO4·(NH4)2SO4·6H2O26,4/20; 33/40
Fe2(SO4)3·(NH4)2SO4·24H2O 124/25;-
Fe2(SO4)3·To2SO4·24N2Osoluble
FeSO4·7H2O32,8/30; 40,1/40
Fe2(SO4)3soluble
gSO437,4/25; 39,7/30
gSO4·7H2Osoluble
uSO422,3/25; 24,4/30
uSO4·5H2Osoluble

The effectiveness of the proposed method block 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 sulfates of metals, in the amount of 20% of the pore volume of the model. Exercised restraint 24 h, and then resumed pumping industrial water. The criterion for evaluating the effectiveness of the proposed CSP is both taken bridging effect (η or 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 given in table 2.

Table 2
no experienceThe addition of sulfates of metals on the weight of the carrier liquid, %The addition of water-soluble polymer on the weight of the carrier liquid, %Bridging effect, %
1-0,160,1
20,010,172,3
30,050,174,3
40,100,178,7
50,150,1of 83.4
60,200,187,5
70,250,190,4
80,010,284, 1
90,050,285, 9
100,100,2of 87.3
110,150,296,8
120,200,2of 97.8
130,250,298,3
Note: as sulfate used Al2(SO4)3; similar results were obtained using homoclinic alum, chromium sulfate, iron sulfate, magnesium sulfate, copper sulfate, or a mixture thereof; (NH4)2SO4·Al2(SO4)3·24H2O, K2SO4·Al2(SO4)3·Al2(SO4)3·24H2Oh, (NH4)2SO4·Cr2(SO4)3·24H2O2SO4·CR2(SO4)3·24N2O, (NH4)2SO4·Fe2(SO4)3·24H2O, K2SO4·Fe2(SO4)3·24H2O and their mixture; as a carrier liquid is used a mixture of anhydrous Devonian oil and light oil products, used in a ratio of 1:1 (other ratios give similar results).

Thus, the optimal quantity is of sulfates of metals 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. A.S. USSR 1421849, 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.

2. Pat. The USSR 1797644, 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.

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

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 phoroshop the importance of 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 a staple - dry aluminum sulfate, chromium, iron, magnesium, copper, or mixtures thereof, or alum with the General formula MIMIII(SO4)2·N2Oh, where MI- Na, K, Pb, Cs, NH4and MIII- Al, Cr, Fe, Mn.



 

Same patents:

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 acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

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

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: increased insulation capacity of grouting compositions.

1 tbl

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: increased source of inexpensive hydrophobic agents with improved adhesion properties, intensified oil recovery due to increased depth of penetration of hydrophobic agent into formation, improved environmental conditions in development of oil formations, and reduced oil production expenses.

2 tbl, 2 ex

FIELD: oil and gas chambers construction.

SUBSTANCE: 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.

EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: enabled formation water inflow insulation without killing of well and restricted pollution of water-inflow part of formation.

3 cl, 1 dwg

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

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

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

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

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 acetate, chrome acetate, iron acetate, magnesium acetate, copper acetate, barium acetate, manganese acetate, calcium acetate or their mixtures.

EFFECT: higher efficiency.

1 tbl

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

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: lowered repair operation cost, enabled utilization in a wide formation temperature range, including that in high-permeation and low-temperature oil reservoirs, and prolonged shelf time of grouting composition.

2 cl, 1 tbl

FIELD: oil and gas chambers construction.

SUBSTANCE: 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.

EFFECT: higher efficiency.

1 ex

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: improved performance characteristics of grouting mortar.

1 tbl

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

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

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

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

FIELD: oil and gas production.

SUBSTANCE: 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.

EFFECT: improved performance characteristics of grouting mortar.

1 tbl

Up!