The processing method of the bottomhole zone of flooded reservoir

 

(57) Abstract:

The invention relates to the oil industry, specifically to methods for processing bottom-hole zone of irrigated hydrophobic layer of powdery materials. The technical result is reducing the removal of polymer particles from the well in the process of oil extraction. In the processing method of the bottomhole zone of irrigated formation comprising pumping into the reservoir under pressure suspension powder of polypropylene in the carrier fluid, followed by exposure time, as specified polypropylene is used, the intermediate product in the production of polypropylene-waste containing, by weight. h· 10-6: titanium 1,3-2,0, magnesium 8,0-12,0, aluminum 40,0-60,0, chlorine 24,0-38,0. Moreover, the contents of the specified waste in the carrier fluid is 1-5 wt.%, the injection of the specified suspension is carried out in an amount of 0.3-1.0 m3for every meter of the effective zone of the thickness of the layer, as a carrier liquid is used PLR(0) or snpch 78/70, or nefras AR 120/200, the specified pressure is from 3 to 15 MPa, the exposure time is 24-48 hours 5 C.p. f-crystals, 2 PL.

The method relates to the oil industry, and specifically to methods of processing the stimulation of oil to producing wells and control their irrigation is the handling of the productive formation with special solutions of chemical reagents, able to provide gidrofobiziruyuschey effect on the breed of collector. The mechanism of waterproofing is based on the fact that in the presence of active centers on the surface of breed components contained in the oil or other systems used as hydrophobic compounds, adsorbed polar groups to the surface, nonpolar - out, so that the surface becomes gidrofobizirovannogo, there is a change in the wettability of the rock, which, ultimately, allows to increase the rate of production wells. As for hydrophobic compounds can be applied as a liquid and the dispersed system containing the smallest hydrophobic particles of comparable size to the pore size of the processed collector. The use of such dispersed systems also allows to reduce the water saturation of the reservoir due to the effect water shut-off.

The known method of intensification of oil production, which is that the bottom-hole zone of the well is treated under pressure with a suspension of hydrophobic powder with a content of 0.1 to 2.5 wt.% in an organic solvent in an amount of from 0.5 to 3.0 m3for each linear meter of the effective thickness of the reservoir, where the powder ispolzuyutsa and others, and as the solvent used light fractions of crude oil, distillate and other, the injection pressure is 4.0-3 8.0 MPa, and the exposure time 12-96 h, high pressure creates a squeezing fluid - oil [U.S. Pat. Of the Russian Federation No. 2125649, E 21 In 43/22 from 27.01.99]. The method allows to increase the rate of production wells 3-10 times and reduce watering to 6-96%.

Closest to the proposed invention is a method of processing permeable underground formation, which consists in forcing into the formation under sufficient pressure liquid having dispersed slowly soluble in oil, water-insoluble solid particles of polymers ranging in size from 1 to 50 μm in an amount of from 1 to 75 wt.%, where as applied polymer particles of polyethylene, polypropylene, copolymer of ethylene and ethyl acetate, a copolymer of ethylene and ethyl acrylate, and a liquid carrier is used, crude oil, drilling fluid is oil-based, the completion fluids oil-based, liquid gap petroleum-based [U.S. Patent No. 3455390 E 21, 43/00, 15.07.1969]. The method can reduce the natural permeability of rocks and as a consequence reduce their water content. When changing the concentration of dispersed particles in a liquid-socialeconomy permeability of oil-saturated formation intervals in the process of filtration of oil to the bottom of a well.

The disadvantage of this method is that its effectiveness may be reduced due to partial removal of the polymer particles, in particular polypropylene, after formation treatment suspensions of these particles in the carrier fluid when returning the well to production mode.

Thus, the problem of increase of efficiency of bottomhole zone treatment water reservoir suspensions of polymer particles in the carrier fluid.

The technical result - the reduction of removal of the polymer particles from the well in the process of oil production.

This technical result is achieved in that in the processing method of the bottomhole zone of irrigated formation comprising pumping into the reservoir under pressure suspension powder of polypropylene in the carrier fluid, followed by exposure time, as specified polypropylene is used, the intermediate product in the production of polypropylene - waste containing, by weight.h.·10-6: titanium 1,3-2,0, magnesium 8,0-12,0, aluminum 40,0-60,0, chlorine 24,0-38,0. Moreover, the contents of the specified waste in the carrier fluid is 1-5 wt.%, the injection of the specified suspension is carried out in an amount of 0.3-1.0 m3for each linear meter effectively the e pressure is from 3 to 15 MPa, the exposure time is 24-48 hours

Powdery intermediate product for the production of polypropylene produced according to TU 2211-020-00203521-96 with Alt. # 1,2,3, and is a polymer obtained in the presence of titanium-magnesium catalyst comprising a spherical porous particles of magnesium chloride (MgCl2), which is applied titanium chloride (TiCl4). As socializaton used triethylaluminum (Al(C2H5)3), as a donor - alkoxysilane. The polymerization process is carried out in liquid propylene, which is then evaporated, and the obtained powder, non-commodity products, are steamed and dried. This powdered intermediate product in the production of polypropylene contains the above-mentioned residual amounts of magnesium, titanium, aluminum and chlorine, which have the ability to increase the polarity of the molecule polypropylene. Even small amounts of these components help to improve the adsorption of molecules of the polypropylene to the breed (due to the presence of polar groups) and Orient the nonpolar part of the polypropylene molecules out, resulting in its water properties increase in several times.

The content of aluminium, magnesium is e MA 15794 on automatic Titrimeter.

For commercial polypropylene granulate (prototype) in the intermediate product is administered various stabilizers and additives, is subjected to its extrusion at t=250°C and granulation. After performing these operations, the contents of amplifying the polarity of the molecule polypropylene magnesium, titanium, aluminum, chlorine is almost equal to zero, which leads to a significantly lesser degree of retention of the polymer particles on the surface of the breed and their removal when returning the well to production mode.

Used the concentration of the powder of the intermediate product in the liquid medium as 1-5 wt.%, due to the requirements of the pumpability of the slurry pump cementing unit. The use concentrations of less than 1 wt.% it is impractical, because in this case too a small amount of powder penetrates into the reservoir, which in turn will reduce the reliability of this method.

The volume injected into the borehole suspension as 0.3-1 m3for every meter of the effective zone of the thickness of the layer due to technical and economic efficiency of the process, the pressure of injection is less than 15 MPa, because it is the maximum allowable pressure for pressurization of the production string.

The quality is about THE 39-05765670 OP-339-97, nefras AR/200 - beyond 38104809-80.

The proposed method is confirmed experimentally. Gidrofobiziruyuschey action suspension powder intermediate product in the production of polypropylene (hereinafter powder-1) and specially milled powder of polypropylene, which is a commercial product, similar to the prototype (hereinafter powder-2), was determined by well-known methods of filtration of different reagents through samples of natural or artificial cores [umrihina E. N., Blazhevich Century A. Isolation of the inflow of formation water in oil wells. - M.: Nedra, Moscow (1966).-163 C.].

Primarily in a laboratory setup has determined the coefficients of permeability of the core by air and kerosene. They were: air is 4.45 μm2on kerosene - 3,89 μm2. Then created a model approximating natural conditions of the reservoir, namely in one direction pass through the core first oil, then produced water and determined the coefficients of water and neftepromremont. Moreover, for each type of powder processed by two of the core. The impact of suspensions of these products was evaluated after missed them through these cores in the opposite direction. Permeability of oil PEFC is voncannon direction. It has increased in 1,5-2 times. Changing the relative permeability of water was determined, missing water in the original direction through another pair of processed cores. She fell 1.8-2 times. Table 1 shows the laboratory data for the processing cores of the suspensions of two kinds of powdery polypropylene powder 1 and powder-2. From table 1 it is seen that the compositions on the basis of two kinds of powder exert a significant influence on the permeability of oil and water. But this information is valid for a temporary period not exceeding one hour after processing.

The second stage of laboratory research is a comparative analysis of the degree of attachment (holding) of the particles of the powder 1 and powder-2 to breed within 3 days. For this pre-prepared cores, as described above, was treated with formulations based on powder 1 and powder-2 in the solvent ALR(OH) concentration of 2 wt.% The initial permeability of oil was of 1.80 and 1.85 μm2for the 1-St and 2-nd cores, respectively. The permeability to oil after treatment (considering the time required for response - 24 h) was 3,70 and 3,50 for compositions on the basis of the powder 1 and powder-2 respectively. Then through the cores treated with the described composition is 4 hours was selected liquid (oil + solvent POLR ()), passed through the core to determine the mass made of polypropylene particles. In liquids, the particles were filtered, dried and weighed, thereby determining the percentage removal of particles of polypropylene. Experiments were performed for composition-based powder-1 and composition-based powder-2. Data on the change in filtration characteristics, including the percentage removal of particles of polypropylene, are presented in table 2. Table 2 shows that for composition-based powder-1 percentage removal of particles of polypropylene is 5-10%, which is considerably less than for composition-based powder-2 (9-61%), which acts as a prototype that proves the claimed technical result, namely that the presence in the structure of the powder-1 even small amounts of titanium, aluminum, magnesium, chlorine increases the degree of retention of the substance in the breed (2-6 times) that, in turn, will contribute to the intensification of oil.

As a result of this effect within 3 days, an increase of 2-2,3 times the permeability of oil with further stabilization of these values, as well as reduced in 2 times the permeability of water after treatment with composition-based powder-1. For composition-based powder-2 pre values, more original only 1.4 times. Reduction of the permeability of oil due to a significant removal of the powder particles-2 (25-61%) after 24 to 72 hours.

The following is an example of the proposed method in an industrial environment.

The proposed method is as follows. Before working on the treatment of bottom-hole zone of flooded reservoir were carried out geophysical studies, which determined that the flow of fluid occurs from the interval 1573-1575 m (bottom layer). The beveled end of the tubing was installed at a depth of 1580 m prepared hydrophobic compound in the following components: 5 m3solvent snpch 78/70 and 45 kg of powdery intermediate product in the production of polypropylene, which corresponds to a 1% increase in the solvent. As the squeezing of the liquid used commodity anhydrous oil. In the tubing was injected 0.5 m3oil and 4.2 m3water-repellent composition, closed annulus and pumped the remaining 0.8 m3the specified composition and 6 m3commodity anhydrous oil. When jacking the solution in the reservoir pressure is increased from 8 to 15 MPa. The hole left on eagerly, which is a tributary of the plantar part of the formation is absent, and in the work including roofing part in the range of 15 70-15 72 m Watering wells as a result of the operation decreased from 95% to 45%, and the average daily oil production rate increased from 0.4 to 4.1 tons/day.

Thus, the proposed method along with the known methods, using dispersions of polymers in organic solvents to stimulation, allows to intensify oil production.

1. The processing method of the bottomhole zone of irrigated formation comprising pumping into the reservoir under pressure suspension powder of polypropylene in the carrier fluid, followed by exposure time, characterized in that, as specified polypropylene is used, the intermediate product in the production of polypropylene - waste containing, by weight. h· 10-6: titanium 1,3-2,0, magnesium 8,0-12,0, aluminum 40,0-60,0, chlorine 24,0-38,0.

2. The method according to p. 1, characterized in that the contents of the specified waste in the carrier fluid is 1-5 wt.%.

3. The method according to p. 1, characterized in that the injection of the specified suspension is carried out in an amount of 0.3-1.0 m3for each linear metre of effective soalr(0), or snpch 78/70, or nefras AR 120/200.

5. The method according to p. 1, wherein the specified pressure is from 3 to 15 MPa.

6. The method according to p. 1, characterized in that the processing time is 24-48 hours



 

Same patents:

The invention relates to the field of gas and gas condensate, namely the removal vodokanalstroi mixture from the well

The invention relates to the field of gas and gas condensate, namely the removal vodokanalstroi mixture from the wells containing produced water and gas condensate, especially from wells with abnormally low formation pressure

The invention relates to the oil industry

The invention relates to reagents having the ability to remove hydrogen sulfide and mercaptans from gases, oil, oil, produced water, drilling fluids, and can be used on objects of oil production, refining, petrochemicals for their neutralization by neutralizing biogenic sulfur compounds

The invention relates to the oil industry

The invention relates to the oil industry, in particular, compositions based biopolymer, namely, an exopolysaccharide produced by a strain of Azotobacter vinelandii (Lipman) FC-1 VKPM B-5933, to regulate the development of oil fields

The invention relates to the oil industry, in particular to a method of processing a heterogeneous oil reservoir

The invention relates to the oil industry, and in particular to compositions for enhanced recovery to limit water shut-in producing wells and enhanced oil recovery

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

FIELD: oil and gas production.

SUBSTANCE: invention aims at increasing productivity of oil- and gas-producing and injecting wells exposing high-temperature low-permeable oil reservoirs. In the treatment method according to invention including forcing enzyme substrate and separate enzyme into formation and creating conditions to enzymatically convert substrate into acid, geologic and productive characteristics for each interval of bottom zone are determined in order to pick out low-permeable intervals of oil reservoir for treatment, whereupon properties of enzyme substrate and separate enzyme as well as conditions for their pumping are chosen. Substrate utilized in the method is head fraction of methyl- and/or ethyl-, and/or butyl acetate production, to which aliphatic alcohols are added, and enzyme is an acid solution. Substrate is pumped simultaneously and/or before, and/or after pumping of enzyme, after which well is closed for some time and then opened and placed under predetermined operational conditions.

EFFECT: enhanced efficiency of acid treatment due to increased phase permeability for oil and deepness of active acid-treated zone of low-permeable oil reservoirs.

25 cl, 1 tbl, 3 ex

FIELD: oil and gas production.

SUBSTANCE: invention is intended for use during development of oil pools at different waterflooding phase for intensifying functioning of producing wells and increasing current oil recovery of formation. Composition contains, wt %: liquid hydrocarbon 10.0-20.0, oil-soluble surfactant 0.3-5.0, water-soluble or water-oil-soluble surfactant 0.1-1.0, superfine hydrophobic material 0.1-2.0, and water (the rest). Composition may further contain 0.3-5.0% calcium chloride. Oil recovery is increased owing to hydrophobization of formation structure, reduction of surface tension in water/rock/oil phase boundary, increase in detergent power of polluted surface, increase in composition viscosity, and increase of relative permeability of the formation for hydrocarbon phase as compared with water phase.

EFFECT: increased oil recovery.

2 cl, 2 tbl, 2 ex

FIELD: oil and gas production.

SUBSTANCE: composition contains 0.05-2.5% of hydrophobic power, 0.05-10% of ethylene/vinyl acetate copolymer, and organic solvent. Composition intensifies oil production owing to increased effective radius of formation bottom area treatment, prevention of moistening inversion effect upon fall of hydrophobic agent concentration, and, consequently, decreased volume of simultaneously produced water.

EFFECT: increased oil production, prolonged overhaul period, improved environmental safety, and lowered production expenses.

2 tbl, 3 ex

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes drilling product and force wells, forcing gas and water through force wells into separate zones of productive bed and extraction of hydrocarbons from product wells, forming separate gas, water and hydrocarbon saturated areas with major contents of respectively gas, collected therein for later use, water and hydrocarbons, periodical pumping of collected gas from formed gas saturated zones to water saturated zones, periodical pumping of water to gas saturated zones is performed. It is possible to pump collected gas to water saturated zones in form of gas-water mixture. It is possible to pump in passing gas of current deposit. It is possible to pump hydrocarbon or non-hydrocarbon gas from other sources. It is possible to pump water with admixture of specifically selected chemical reagents or compositions thereof. When gas content in water saturated zones reaches from 0.1 to 28% from water content in water saturated zones it is reasonable to generate resilient waves with frequency within range from 0.0001 to 45 KHz and amplitude within range from 0.02 to 2.8 MPa. It is reasonable to pump gas and water to separate areas of productive bed with concurrent generation of resilient waves in there with frequency within range from 0.0001 to 45 KHz and amplitude within limits from 0.02 to 2.8 MPa.

EFFECT: higher efficiency.

7 cl, 5 dwg

FIELD: oil extractive industry.

SUBSTANCE: method includes pumping of Sulfacella water dispersion into bed through force well and extraction of oil through extracting well, said dispersion additionally containing non-ionogenic surfactant AF9-12 with following ratio of components, in percents of mass: Sulfacella 0.5-1, AF9-12 0.01-0.1, water- the rest, while, before pumping of said dispersion mineralized water is pumped with total mineralization until 290 g/l in amount of 10% from volume of said dispersion, when pumping said dispersion prepared in fresh water, drain water is previously pumped, and when pumping said dispersion made from drain or bed water, bed water is previously pumped. For preparation of said dispersion fresh, drain or bed water is used with mineralization till 290 g/l.

EFFECT: higher efficiency.

2 cl, 2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes examination of operation well for gas-condensation and periodical cleaning of face-adjacent well area from precipitating hydrocarbon condensate by pumping hydrocarbon condensate solvent into bed, exposure of well for period of condensate dissolution and following removal of received solution from face-adjacent area during well launch, as solvent binary mixture is used with unlimited mutual solubility of components, while at least one of them has unlimited mutual solubility with hydrocarbon condensate, and relation of binary mixture components is determined from previously built phase diagram of three-component system, formed during dissolution of hydrocarbon condensate. As binary mixture with unlimited mutual solubility of components a mixture of acetone and methanol is used, or chloroform and methanol, or chloroform and aniline, or chloroform and acetone.

EFFECT: higher productiveness.

2 cl, 3 ex, 6 tbl, 2 dwg

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes placing water solution of carnallite ore, either modified, concentrated, or mixtures thereof, said solution is used at maximal for well temperature conditions concentration and is pumped in amount, necessary and enough for forming a hydraulic column in well shaft above ceiling of productive bed and along remaining shaft height well is filled with water up to mouth. Carnallite ore used has composition, in percents of mass: potassium chloride 20.5-21.5; sodium chloride 19.5-22.5; magnesium chloride 24.0-27.0; crystallization water 29.5-30.5. Modified ore has composition, in percents of mass: potassium chloride 23.0-29.5; magnesium chloride 31.8-46.0; crystallization water - the rest. Said water solution is prepared by dissolving ore in fresh technical water, drained from oil preparation plants, or in bed water. In case of dissolving in bed water, the latter is pumped from well at temperature 60-90°C. During perforation of well, value of technological liquid hydraulic column above productive bed ceiling is taken equal to (1.03-1.07)-(1.05-1.1)Pb, where Pb - productive bed pressure. Water solution of carnallite ore is used at density 1.23-1.37 t/m3. During use of said solution as working body of force wells it is used at density 1.05-1.20 t/m3, and solution also contains swelling inhibitor for argillaceous component of oil and gas bearing bed, like oxyethylenedendiphosphone acid, in amount 0.05-0.15% of used dissolved ore mass.

EFFECT: higher efficiency.

1 cl, 4 ex

FIELD: oil industry.

SUBSTANCE: method includes treatment of face area of oil bed by hydrophobic agent in organic solvent and pressing oil from collector with following delivery of oil from face area of product well for treatment of oil terrigenic bed, in form of hydrophobic agent solution of ethylene copolymer with vinylacetate in ethylbenzol or fraction thereof is used in relation 1:1 - 10, treatment of face area is performed with following ratio of components, in percents of mass: ethylene copolymer with vinylacetate 0.05-2.0, ethylbenzol or fraction 0.05-20.0, organic solvent - the rest.

EFFECT: higher efficiency.

2 tbl, 2 ex

FIELD: mining industry and alternative fuels.

SUBSTANCE: coal is affected by methanogenic consortium of microorganisms with culture medium utilizing continuous pumping of culture medium through wells and tank wherein methanogenic consortium of microorganisms with culture medium is placed. Tank is installed on the surface above wells and pumping of culture medium from the bottom of tank through methanogenic consortium of microorganisms. Process produces biogas and coal-water fuel.

EFFECT: increased yield of biogas to continuously effecting culturing of microorganisms.

1 dwg, 2 tbl

Up!