The method of isolation of water and getprotocol in wells

 

The method of isolation of water and getprotocol in wells refers to the oil industry and can be used for isolation of water and getprotocol in wells neftegazonosnyh collectors, predominantly carbonate. The technical result - improving the efficiency and reliability of the method. The method of isolation of water and getprotocol in wells, including injection insulating composition through hydrodynamic oscillation generator installed in the tubing pipes in the interval of injection of the composition into the reservoir, provides prior to injection into the formation of the insulating composition through hydrodynamic oscillation generator download fringe a mixture of water with commercial oil and rims of water or aqueous sedimentation reagents and conducting technological exposure, the insulating composition use composition containing high molecular uglepodgotovitelnyj polymer is butyl rubber with a molecular mass of 16000-60000 or polyisobutylene with a molecular mass of 20000-80000, hydrocarbon solvent and high-viscosity oil in the following ratio, wt.%: the specified high molecular uglepodgotovitelnyj polymer 0,25-0,35, uglevodorodyonogo n-heptane, n-hexane, diesel fuel, kerosene, gasoline, natural gas condensate. And after injection of the insulation composition through hydrodynamic oscillation generator download fringe water, oil, nonionic and/or anionic surfactants in the following ratio, wt.%: nonionic and/or anionic surfactant 0,08-0,2, commodity oil 50,0-54,0, water the rest. Technological exposure can be carried out in a period of time not less than 40 hours as sedimentation reagents can be used solutions of soda ash and liquid glass in fresh water and potassium chloride water with density 1160-1200 kg/m3. Water commodity oil, solutions sedimentation reagents and oil with an aqueous solution of nonionic and/or anionic surfactants - surfactants can be injected into the column tubing simultaneously or separately. 5 C.p. f-crystals, 3 tab., 1 Il.

The invention relates to the oil industry and can be used for isolation of water and getprotocol in wells neftegazonosnyh collectors, predominantly carbonate.

There is a method of isolation of water and getprotocol in squag the ri mixture which is formed vadagadacilebuli material, and after injection solutions madagascariensis intervals of the formation affect the acoustic oscillations. As a result, in these intervals is dynamic acceleration and more efficient mixing of reagents with the formation of a solid insulating material, due to acoustic flows (ed. St. USSR 1640364, CL E 21 In 33/138, publ. in B. I. 13, 1991). The disadvantages of this method are the large amount rims of the injected reagents and excessive consumption of the base reagent is inherent to methods with sequential injection of reagents. Because the impact on the formation of acoustic vibrations produced after injection of the reagents, the dynamic mixing will only occur on the boundary of rims and increase coverage of the processed interlayer insulating effect will be insignificant. And in the case of isolation gazobetona, due to the high penetrating ability of gas, the known method becomes unreliable due to breakthrough of gas in low-permeability intervals isolated interlayer. The low efficiency of this method when applied in carbonate (hydrophobic) reservoirs is also a consequence of bright pyunyh layers, including the injection of the insulation composition of the hydrocarbon-based, characterized in that the insulation composition of the pumped oil solution of the polyolefin in the following ratio, wt. %: polyolefins - 0,8-10, oil - 90-99,2 (RF patent 2081310, CL E 21 In 43/32, publ. in B. I. 16, 1997). The disadvantage of this method is the high consumption of a basic reagent (polyolefins). Applied in the known method, the polyolefin is a low molecular weight polymers (oligomers) which, when dissolved in oil of medium viscosity form a biphasic solution of oil - dispersed phase. Therefore, the isolation mechanism such solutions are close to the movement of a mechanical blockage of the formation, but in a weakened form. Consequently, the known method is ineffective for prolonged restriction of inflow of water into the well. From the above description of the example implementation of this method on the well implies that it is inefficient to limit the flow of gas into the well, as the oil and hydrocarbon gas unlimited mixed together.

Closest to the proposed invention is a method of restricting the inflow of water into the producing wells, providing for the injection IKI it into the reservoir install hydraulic vibrator in the column tubing. Before injection of the insulating composition in the reservoir interval injection is subjected to vibration impacts from hydraulic vibrator in the processing of wells in circulation (RF patent 2168608, CL E 21 In 33/13, 43/32, publ. in BIPM 16, 2001).

The disadvantage of this method is low efficiency from the use of gel-forming compounds on carbonate rocks, the increased consumption of basic chemicals, the need for preliminary laboratory study for each processed borehole core samples from the reservoir to determine the ion-exchange activity breed of collector when interacting with the gel-forming composition and associated water - to establish the process of precipitation during its interaction with this song.

The objective of the invention is to improve the efficiency and reliability of the method is mainly applied to carbonate reservoirs by increasing the uniformity of coverage of the formation rims filterable liquids and increasing isolation steps used in the method of insulating composition in conjunction with the proposed technological operations, along with the reduction of the consumption of the basic reagent.

The problem is solved Theo composition through hydrodynamic oscillator, installed in the tubing pipes in the interval of injection of the composition into the reservoir, according to the invention, prior to injection into the formation of the insulating composition through hydrodynamic oscillator pumped a slug of a mixture of water with commodity oil, then the rim of the water or aqueous solution precipitation forming reagents, and conduct technology exposure, the insulating composition use composition containing high molecular uglepodgotovitelnyj polymer is butyl rubber with a molecular mass of 16000-60000 or polyisobutylene with a molecular mass of 20000-80000, hydrocarbon solvent and high-viscosity oil in the following ratio, wt.%: High-molecular uglepodgotovitelnyj polymer - 0,25 - 0,35 Hydrocarbon solvent - 8,0 - 10,0 high-Viscosity oil - the Rest as a hydrocarbon solvent using n-heptane, n-hexane, diesel fuel, kerosene, gasoline, natural gas condensate.

After injection of the insulation composition suitable for improving the reliability of the method to upload via hydrodynamic vibrator constituting water, crude oil, nonionic surfactant - surfactant type ethoxylated alkylphenol and/or anionic the second surfactant type ethoxylated alkylphenol and/or anionic surfactants of the type NP sulfonic acid-3 - 0,08 - 0,2 Marketable oil - 50,0 - 54,0 Water - the Rest as nonionic surfactants can be used OP-6, OP 10, disolve-4411, AF9-6, AF9-12, separol-25 and other

As anionic surfactants can be used surfactant type sulfonic acid NP-3.

Technological exposure it is advisable to set for at least 40 hours.

As sedimentation reagents can be used soda ash solution with liquid glass in fresh water and potassium chloride water with a density of 1160 - 1200 kg/m3.

To obtain a stable inverse emulsions and maximum sediment at the output of the generator is advisable water with commodity oil, sedimentation reagents and marketable oil with an aqueous solution of nonionic and/or anionic surfactant injected into the column tubing simultaneously and separately.

The technical result in the proposed method is achieved by forming in the rock around the wellbore solid, uniform gas-tight screen held in the reservoir by a continuous rim offer insulating composition. The creation of such a screen is possible by increasing the uniformity of coverage of the insulated pays for the expense of obtaining fine dispersion in the reservoir in the field of elastic waves, and thanks to the destruction of these field fluctuations polymolecular layers of physically bound water and their mass removal from the surface of rocks. Download fringes formed in the layer of the inverse emulsion and aqueous sedimentation reagents in these conditions creates favorable preconditions for the subsequent hydrophobic interaction sites emerging spatial grid proposed insulation composition with a hydrophobic surface pores and cracks carbonate rocks. Thus, the application of the proposed sequence of fringes in the field of elastic waves provides after technological excerpts getting in the hydrophobic layer is rigidly coupled with the rock two-phase system consisting of mobile and immobile phases, which makes the phase constant of water gastight screen insignificant.

Increasing isolation steps in the present invention is achieved qualitatively new properties offered insulating composition, the main of which is the phase transition "viscous solution - pseudogene - gel after preparation of the solution depending on the type of high-molecular polymer and selected for it pliopithecus from 20 to 65oFor butyl rubber with a molecular weight of 16,000 - 60000 and polyisobutylenes with a molecular weight of from 20,000 to 80,000. In the drawing for a demonstration of this transition shows the dependence of macroviscosity from the time that has elapsed after its preparation, for insulating composition containing 0.3% butyl rubber with a molecular weight of 16,000, 9.7% of diesel fuel and 90% of high-viscosity oil with a kinematic viscosity of 136 mm2/s, measured at a temperature 30oC. a Solution of butyl rubber in the diesel fuel was prepared within 3 days with periodic stirring, its viscosity was 3 mm3/s, i.e. it is true. Then it was mixed with the heavy oil in the ratio that satisfies the proposed composition. When using polymers with the above-mentioned molecular mass was phase transition "viscous solution - pseudogene - gel". Similar dependencies were obtained for the entire claimed range of concentrations of the used polymer.

As high-molecular uglepodgotovitelnyj polymers can be used butyl rubber with a molecular mass of 16000-60000 or polyisobutylene with a molecular mass of 20000-80000. The upper limit of the molecular weight due to the solubility of the polymer that at a given molecular weight, the polymer is still able to cause a phase transition in the insulating composition "viscous solution pseudogene - gel" For similar insulating composition, but on the basis of low-molecular-weight butyl rubber or polyisobutylene identical represented in the drawing dependence was observed only the first step, i.e., recorded only a transition viscous solution - pseudogene".

Table 1 shows the values of macroviscositytime of rotationR6oil-soluble nitroxyl radical R6measured using the spin probe for the above insulating composition at different points in time after its preparation. Macroviscosity composition was measured at a temperature of 20oC. According to the formula of Stokes-Einstein time of rotationR6directly proportional to microviscosity insulating composition.

Formally defined at time t = 0 and 24 hours of activation energy probe Uasmall in size, and the corresponding time t=5 hours the temperature dependenceR6near the temperature of the 35oWith characterized by inflection (formally calculated two values Ua), which suggests that in this case the standard concept of activation energy are not applicable. With the growth and liquids), due to the phase transition in time t > 5 hours. For time t = 51 hour enthalpic component similar in magnitude to the known values of the activation energy for free liquids. Regularities of changes in macroviscosity in time similar to that shown in the drawing, macroviscosity studied insulating composition with the growth time is increased, and the microviscosity is reduced, due to microrasbora this composition. The obtained regularities of changes in time of the parameters Ua,andR6due to the formation in the insulating composition of net supramolecular structures such as gel after 29 hours after its preparation. The base nodes of the spatial grid of the gel are gearing macromolecules of high molecular weight polymers, which unlike macromolecules oligomers have the structure of a Gaussian coil, and/or associates segments of these macromolecules. Kinetic unit of this grid is mainly composed of associates resins.

Hydrodynamic modeling of the process of isolation of the PPP was carried out according to OST 39-195-86 Oil. The method of determining the coefficient of oil displacement by water in the laboratory is Le full irrigation of carbonates at the specified OST was measured permeability for water carbonate core, then were injected into the core of the proposed insulating composition or water-oil emulsion with a surfactant. Emulsions were prepared using a propeller stirrer for 40 minutes. After a time of technological extracts was determined by the permeability of the core on the water and was calculated insulating effect.

In table. 2 and 3 shows the results of the studies for the proposed structures.

The mechanism of increase of the chemical steps used in this method, the insulating composition is mainly determined by two factors. In the field of long-range surface forces hydrophobic carbonate rocks in pumped into her composition over time phase transition occurs for organizing spatial grid of gel on its surface, leading ultimately to the formation of structures of type tverdometallicheskih (molecular crystals) with abnormal physical-mechanical properties (static structure). In the Central area of pores and cracks over time formed a gel-like structure, the phase transition viscous solution - pseudogene - gel". Factor hard sealing composition on the surface of carbonate rocks to a considerable extent determined by th water from the surface of rocks. In the proposed method creates favorable conditions for hydrophobic interaction sites emerging spatial grid insulating composition with a hydrophobic surface pores and cracks carbonate rocks (bonding sites by surface) and adsorption kinetic units of the grid on the surface.

The use of sedimentation reagents, such as aqueous solutions of soda ash, sodium silicate and potassium chloride water with density 1160-1200 kg/m3allows you in addition to create a gas-tight screen to reduce the volume of the rim of the insulation composition. When dual injection of these chemicals into the well at the outlet of the hydrodynamic oscillation generator is formed an aqueous solution gidrofobizirovannogo thin-dispersed sediment, and because directionspoint physically bound water is removed from the zone to be isolated, with this method of injection, the sediment yield is maximum.

The method is as follows.

Producing well, discover carbonate reservoirs, subject to isolate the flow of water or gas, if the water content of the product exceeds 70% (or actually the well production was gas). Factors plieuse shall be cement sheath in the perforated interval of the reservoir, the history of the exploitation wells (the efficiency of the method above, if earlier, the well was not conducted water or gas insulation work or pilot injection of chemicals in the bottomhole formation zone).

Before carrying out the insulation work on the selected well prepared in the required number of true solution of high-molecular uglevodorodyonogo polymer in hydrocarbon solvent concentration of 2.5 - 3.5%. The kinematic viscosity of the true solution is 3-6 mm2/s In washed to the bottom selected for isolation of the well down in the isolated perforation interval of the reservoir cavity with a hydrodynamic oscillation generator of the type HDV and mechanical packer type MVP-118-350 with an anchor on the column tubing (tubing). On the wellhead fixture install aerator for dual injection into the tubing string two dissimilar liquids. After filling the wells to the mouth water through the drill pipe and the generator determine its acceleration through the water and produce planting packer. Consistently in the reservoir through the aerator, the tubing and the generator pumped simultaneously and separately two pump units of the type CA-320M rim water and twuu technical water with density 1160-1200 kg/m3the fringe prepared immediately before injection of the insulating composition by mixing appropriate ratios of high molecular weight uglevodorodyonogo polymer in a hydrocarbon solvent with high viscosity oil. Improving the reliability of isolation can be achieved by injection into the reservoir through the hydraulic vibrator behind the rim of the insulation composition of the rim of a mixture of water, crude oil and surfactant. Download this rim corrects a possible incorrect assessment of different reasons and time consuming process extracts duringin the flow of water or gas into the well. Commodity oil, water, or water with a surfactant is injected through the aerator into the tubing string at the same time separately, receiving the output of the hydraulic vibrator fine reverse emulsion, is additionally stabilised by the surfactant, which is under the influence of elastic waves in the reservoir is not stratified and gets high penetrating ability and stability, i.e., increases its efficiency as a material for temporary isolation layer. The upper and lower limits for the components of this rim is defined in accordance with the rules of preparation of the inverse emulsion. The total volume of Estonia, less than half the distance to the border zone of effective elastic oscillations (4 - 5 m). It is obvious that the volume of the rim water or aqueous sedimentation reagent should be at least half the total volume of the injected rims (50 - 60%). Because rim: a mixture of water with commodity oil, a mixture of water with commercial oil and surfactant (when the output of the hydraulic vibrator into the reservoir, they are converted into a stable inverse emulsion) and insulating composition perform similar functions in isolation (the first two rims responsible for temporary and last for a continuous insulation tributaries water and gas), their amounts should be comparable in magnitude. In the injection process, rims are in control of the injection pressure. After the end of injection rims the hole left on the technological holding, then test it on the pickup on the water.

In the case of establishing the characteristics of absorption of water of selected wells or increased throttle response, its annulus is filled with oil up to the upper holes of the perforated interval of the reservoir and the injection rims fluid is carried out in the stated sequence without setting the packer.

Examples of specific implementation of the JV is 59 and 2860 - 2868 m Reservoir pressure of 26.5 MPa. Reservoir temperature 53oC. Operating the column diameter 168,3 mm, the Well flowed with oil output Qn= 6 - 8 tons/day at high gas content, which broke from the gas cap on the interval 2839 - 2849 m the decision to restrict the flow of gas into the well through the interval 2839 - 2849 m Before the beginning of the gas insulation work was prepared with 1.3 m3the true solution of the butyl rubber-1675 in gasoline a-76 with a concentration of 2.7 wt. % by periodic intensive mixing 30 kg crushed butyl rubber in gasoline in steel covered container for three days. In the hole 73 mm tubing was lowered resonator oscillator type DG 2B, is made on the basis of vortex centrifugal atomizers, with the installation of cracks resonator at a depth 2844 m In the annular space of the well water was replaced with oil to a depth 2839 m Measured by means of the pump unit CA-320M pickup well in water amounted to 576 m3/day at a pressure of 6 MPa. Through the aerator, a tubing string, a generator with two resonator units CA-320M in isolated interlayer were simultaneously and separately pumped 10 m3water and 10 m3commercial oil with a viscosity of 27 mm23/s, 5 m3technical water with surfactant (9 kg sulfonic acid PP-3 ) and 6 m3oil with a viscosity of 160-170 mm2/s

In the injection process, the rims of the injection pressure increased from 4 to 9 MPa. The well was left for 48 hours to process the extract, after using the unit of CA-320M was measured injection wells for water, the discharge gas was not detected. The injection wells after isolation of the reservoir interval 2839-2849 m amounted to 411 m3/day at a pressure of 6 MPa, i.e. it decreased by 1.4 times. After completion of the insulation work and putting the well into operation, she began to work with oil output Qn= 12-28 t/day. In 1.5, the flow rate was 10 t/d in the gas factor of 500 m3/t normal for oil mined seam KT-1. Effective isolate the flow of gas is high and is accompanied by a clear effect on additional oil production.

2. Production well depth 1203,5 m reveals tournaisian carbonate reservoir layer in the perforation interval 1195 -1204 m pressure 9 MPa, reservoir temperature 26oC. the density of the formation water 1160 kg/m3. The flow rate of fluid QW= 4 m3/day, the water content of 100%. The diameter of operational colonialization work was prepared 0,41 m3the true solution of the butyl rubber-1675 in aviation kerosene at a concentration of 2.7 wt.% by periodic mixing 10 kg of crushed butyl rubber in kerosene at a speed of 130 rpm in the apparatus of SIN in "P" for 3 days. As a high-viscosity oil was used a solution of marketable bitumen (0.7 m3in the Devonian oil (4.0 m3with viscosity= 160-170 mm2/s

In the hole 73 mm tubing was lowered resonator oscillator type HDV and packer type PV-M-118-350 with the installation of cracks resonator at a depth 1201 m According to hydrodynamic studies of well method of flow measurement (RGD) its acceleration on the water was 180 m3/day at a pressure of 6 MPa.

After the landing of the packer through the aerator, a tubing string, a generator with two resonator units CA-320M in isolated interlayer were simultaneously and separately injected 2.5 m3saline water and 2.5 m3Devonian oil, 7 m3solution of liquid glass and soda ash in fresh water and 9 m3technical potassium chloride water with a density of 1180 kg/m3; 4,1 m3insulating composition; 2.5 m3fresh water with the addition of sulfonic acid and 2,5 m3Devonian oil.

The pressure at the beginning sole it is finished using the unit of CA-320M was measured injection wells for water, it amounted to 120 m3/day at a pressure of 10 MPa. The specific injection wells for water restrictions water flow over the interval 1195 - 1204 m decreased 2.5 times.

After completion of the insulation work and putting the well into operation oil output amounted to 1.9 t/day when the water content of 5%. After a year, the well continued to work in the same mode.

The efficiency and reliability of the proposed method isolation of the water in the well is high and is accompanied by a clear effect on additional oil production.

Thus, the method provides effective insulation of water and getprotocol in wells with a significant reduction of consumption of basic chemicals insulating composition - uglevodorodyonogo polymer. Its consumption is approximately 10 times lower compared to similar and more than 100 times in comparison with the prototype.


Claims

1. The method of isolation of water and getprotocol in wells, including injection insulating composition through hydrodynamic oscillation generator installed in the tubing pipes in the interval of injection of the composition into the reservoir, characterized in that prior to injection into the formation of the insulating composition through hidrogo solution sedimentation reagents and conduct technology exposure, at the same time as insulating composition use composition containing high molecular uglepodgotovitelnyj polymer is butyl rubber with a molecular mass of 16000-60000 or polyisobutylene with a molecular mass of 20000-80000, hydrocarbon solvent and high-viscosity oil in the following ratio, wt.%:
High-molecular uglepodgotovitelnyj polymer - 0,25-0,35
Hydrocarbon solvent - 8,0-10,0
High-viscosity oil - Rest
2. The method according to p. 1, characterized in that as a hydrocarbon solvent using n-heptane, n-hexane, diesel fuel, kerosene, gasoline, natural gas condensate.

3. The method according to each of paragraphs.1 and 2, characterized in that after the injection of the insulating composition through hydrodynamic oscillator pumped a slug of water, crude oil, nonionic and/or anionic surfactants - surfactants in the following ratio, wt.%:
Nonionic and/or anionic surfactants - 0,08-0,2
Commodity oil - 50,0-54,0
Water - the Rest
4. The method according to each of paragraphs.1 -3, characterized in that the technological exposure is carried out in a period of time not less than 40 hours

5. The method according to each of paragraphs.1-4, characterized in that as sedimentation R will bind water with density 1160-1200 kg/m3.

6. The method according to each of paragraphs.1-5, characterized in that the water product oil solutions sedimentation reagents and oil with an aqueous solution of nonionic and/or anionic surfactant is injected into the column tubing simultaneously or separately.

 

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1 tbl

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