Polymer backfilling composition for isolation of water influx in high temperature oil and gas wells

FIELD: oil and gas production.

SUBSTANCE: composition includes phenol-formaldehyde resin of resol type, curing agent and mineral or organic filler. Additionally composition contains an activating agent of the process - resorcin and expanding additive EA-100. As ageing agent there is used ferro-chrom-lignosulphonate FCLS-M and additionally expanding additive of type AE-100 at the following ratio of components, wt shares: phenol-formaldehyde resin PFR-3027B 100; ferro-chrom-lignosulphate FCLS-M 1.0-10; resorcin 1.5-10; filler (carbon white CW-120 or talk, or rubber powder, or chalk or barite) 4-8; expanding additive EA 5-15.

EFFECT: reduced water loss of backfilling solution and increased strength and adhesion characteristics of cured composition.

2 cl, 3 tbl, 11 ex

 

The invention relates to oil and gas industry and can be used for repair and insulation works in production wells.

For cement works in wells, the most widely used continue to find cement mortars as the cheapest insulation materials (umrihina E.N., Blazhevich VA Insulation inflow of formation water in oil wells. M.: Nedra, 1966, 164 C.). However, in many cases, their use is inefficient because:

the impossibility of penetration into the formation to the desired depth;

high density;

high water yield;

insufficient mechanical strength.

In recent years, to isolate absorbing horizons have found an extensive use of polymer cement materials on the basis of phenol-formaldehyde, urea -, furan, polyurethane, epoxy, silicone, and other resins (Strizhnev C.V., Strizhnev VA "Select backfill material for the study of technology of repair work", J. "Drilling" No. 9, 2006, s-111). The ability to penetrate to great depths without changing the consistency and be cured within the specified period is a big advantage over conventional cement compositions.

For curing most polymer grouting material is necessary in acidic hardeners (salt, phosphate, silicofluoride and other acids or their acidic salts (aluminum chloride, aluminum sulfate, ferric chloride). A common shortcoming cement compositions of acid-cured is high corrosion ability in relation to breed, cement, metal casing string.

The closest in technical essence to the invention is a polymer cement composition containing a phenol-formaldehyde resin (brand SPI-B), an acidic curing agent is a mineral or organic acid, resorcinol, filler and a foaming agent (isocyanate, methylene chloride, ammonium carbonate, etc.)

However, these compositions have high corrosion activity, which limits their use in terrigenous and especially in carbonate reservoirs. Formed during the curing of cement stone has shrinkage, reduction which is achieved by the introduction of foam. In addition, the disadvantages of known composition (prototype) should also be attributed to high rates of water loss of the polymer suspension, resulting in filtering inert filler for injection grouting composition into the formation.

The technical result of the present invention is to develop a non-acidic method of curing phenol-formaldehyde resin SPI-B rezol type, manufactured Orekhovo-Zuyevo obyedinenie the m "Carbolite", reducing water loss cement slurry and increase in strength and adhesion characteristics of the cured composition.

This technical result is achieved by the fact that the grouting composition to isolate water production in oil and gas wells, consisting of a phenol-formaldehyde resin rezol type of curing catalyst, a mineral or organic filler, characterized in that it further comprises an activator process - resorcinol - expanding additive DR-100, and as a catalyst for use ferrochromolignosulfonat FHLS-M in the following ratio of components (parts):

phenol-formaldehyde resin SPI-B100
ferrochromolignosulfonat FHLS-M1,0-10
resorcinol1,5-10
filler (white carbon black BS-120, or talc,
or crumb rubber, or chalk, or barite)4-8
expanding additive DR-1005-15

Used as a hardener instead of the acid FHLS-M and resorcinol allows about the affirmation of the composition in the temperature range of 55-115C, eliminate breakage of the cement stone and significantly reduce its corrosiveness. At lower temperatures the curing of the composition by using the above reagents is difficult.

FHLS-M in the grouting composition has two functions: catalyst and amendment. The structuring of the reaction mixture leads to an increase in solution viscosity and the formation sedimentation-stable system (with the introduction of the solution of the filler). This can significantly reduce the water loss solution, which compared with the prototype decreases in 3-3,5 times. Resorcinol in the composition performs the function of the activator (or socializaton) of the curing process.

Use as curing agents, compounds of non-acidic type significantly extends the use of cement composition during the RIRs as terrigenous and carbonate reservoirs. Included in the inert fillers (white carbon black BS-120, talc, crumb rubber, chalk, barite) help to reduce water loss and shrinkage, increase the strength characteristics of cement stone. The composition further comprises an expanding additive DR-100, providing a complete liquidation of shrinkage and avoid perforating fluid channels of the cured polymer stone.

Primestarinternational resin rezol type CFG-B is a clear liquid, light brown, THE 2221-103-05015227-04. Resorcinol technical GOST 997074 is a colourless crystalline substance, soluble in phenol-formaldehyde resin. FHLS-M on THE other 2458-015-20672718-2001 - modified product of the interaction of lignosulfonate salts of chromium and iron, water-soluble disperse the powder brown. Expanding additive DR-100 (calcium oxide) production of NPK SON", THE 5744-002-82475767-08, is analogous to expanding additives RD (TU 5744-002-59758749-06).

The grouting composition in comparison with the prototype has a neutral nature of the reaction mixture, characterized by homogeneity, low viscosity (viscosity 27-35 s B3-246, the nozzle diameter 4 mm)with adjustable time loss of fluidity and curing in the temperature range 55-110C. In the curing process produces a homogeneous insulating material without shrinkage, with increased in comparison with the prototype mechanical strength and adhesion to the rock collector and to the metal, resistant to acid and aqueous solutions of salts.

When studying the properties of polymer cement compositions was determined by the following parameters:

the viscosity VZ-246 (4 mm), sec;

the rate of filtration in the VM-6 (cm3/30 min);

bending strength, MPa (GOST 26798.1-96);

adhesion to metal, MPa.

The adhesion properties of the resulting cured material from powerestimator was determined on the device with a cylindrical holder and punch in methodology (Danyushevsky B.C., Aliyev P.M., Thick F reference manual backfill materials, 2nd ed. revised and enlarged extra - M.: Nedra, 1987. - S-353).

Below are examples confirming the possibility of carrying out the invention.

Example 1.

Into the flask was loaded with 100 g of a phenol-formaldehyde resin with a viscosity of 31 seconds (at 20C). Then when the stirrer in the flask is introduced in 5.0 g of resorcinol. After dissolving resorcinol, which lasted 10 minutes, gradually over a period of 5 min was added 5.0 g FHLS); Stirring was continued until complete dissolution of the reagent within 20 minutes the viscosity of the solution was 83 C. In the resulting structured solution gradually over a period of 5 min was introduced filler - white soot BS-120 - in the amount of 4.5 g and 10 g of an expanding additive DR-100. Stirring is continued for another 5 min with stirring speed paddle stirrer 800 rpm

Thanks to the amendment FHLS-M deposition of a filler and an expanding additive from the solution was observed within 3 hours.

Note that this time is sufficient for the preparation of cement slurry, injection and produce it into the reservoir.

After preparation of the solution were tested on water yield (f), which amounted to 31 cm3/30 minutes Yield known cement slurry (prototype)consisting of phenol-formaldehyde resin, an acid curing agent (HCl) and n is politely BS-120 (see example 2) in analogous conditions is 110 cm3/30 minutes

The resulting suspension was placed in a heat chamber with a temperature of 75C and periodically observed the change in the consistency of the cement slurry. Time loss of yield strength was determined from the moment of mixing the components to the point of loss of mobility in the absence of displacement of the meniscus when the inclination of the vessel with the reaction mixture. The full cure time was determined by the absence of forcing backfill material when pressed with a needle.

Loss of yield occurred after 3 h, and the complete curing of the composition occurred within 24 hours of the Formed stone has high mechanical properties, high chemical resistance in saline water and hydrochloric acid, significantly greater than the resistance of the cement stone. After 2 days of storage of solidified samples in formation water at 75C the adhesion value of the metal was 1.32 MPa (in the same conditions for cement without additives, this value does not exceed 0.9 to 1.0 MPa). Linear expansion of the cured sample in the form of a bar length of 10 cm was 2.5%, the bending strength of 8.6 MPa.

Example 2 (prototype).

Operating temperature 75C.

Into the flask was placed 100 g of a phenol-formaldehyde resin with a viscosity of 31 seconds (at 20C). Then when the stirrer in the flask was introduced a curing catalyst (8 ml of 18%HCl). P the following stratification of the mixture of the upper aqueous layer was decanted, and the lower resin layer added filler (4.5 g BS-120) and 0.2 g of ammonium carbonate, which is a foaming agent. Stirring is continued for another 10 minutes

The viscosity of the formed suspension was 120 C. the Suspension was placed in a heat chamber with a temperature of 75C. At this temperature for a time of fluidity loss amounted to 1.5 hours, full cure has taken place for 20 hours. Below in table 1 comparative rheological and physico-mechanical properties of the cement compositions of examples 1 and 2.

Table 1
Properties of cement compositions before and after curing at a temperature of 75C
# exampleViscosity, secF, cm3/30 minFlexural strength, MPaAdhesion to metal, MPaThe coefficient. Lin. expansion, %
183318,61,322,5
2120ON7,2 0,430,5

Comparing the data presented in table 1, we can conclude that almost all characteristics of the developed cement composition superior to similar data of known composition. Especially these differences in water yield (> 3.5 times) and in adhesion to metal (> 3.1 times). In addition, replacement of the curing catalyst (acidic to neutral) significantly alters the pH of solutions, components for examples 1 and 2 of 7.6 and 2.1, respectively.

In the curing process (example 1) is formed of a homogeneous insulating material without shrinkage, with increased in comparison with the prototype mechanical strength and adhesion to the rock and metal, resistant to acid and aqueous solutions of salts.

Examples 3-11.

Recipe of cement composition has set a time of fluidity loss, which should not be less than 2-2,5 hours This time is necessary to prepare the solution, injection tubing and produce it in the interval leaks. The results are shown in table 2.

Table 2
The definition of the modes of loss of fluidity and curing cement composition in the temperature range of 55-115C
# example Composition, partsTemperature, CTime fluidity loss, hThe full cure time, hours
SFG-BresorcinolFHLS-Mfiller
31001010-551548
41001010BS-120,4551548
510088-657,530
610088Res. CR.,6658,030
71006,56,5chalk, 1075524
810055talc, 5852,424
91001,51,5talc,3952,018
10100-1,0other flour, 4,5ON1,512
11x100-1,0other flour, 4,51152,515
xthe composition additionally contains 30 parts of a curing inhibitor - crepitus-40.

As seen from the data in table 2, adjusting the concentration of FHLS-M and resorcinol, manages to achieve the time of the loss of fluidity of cement mortar not less than 2 h, which is needed for carrying out insulation works well. And only at a temperature of 115C to achieve the desired curing parameters in composition must also be entered retarders process (example 11).

The presence in the solution of inert fillers in the amount of 4-8 wt.% with respect to the polymer resin does not have significant effect on the curing rate, but reduce water loss solution and increase the strength characteristics of cement stone. Thus, the rate of filtration (f) freshly prepared cement slurries of examples 3 and 4 was 77 and 35 cm3/30 min, respectively, i.e. in the presence of 4 parts filler f decreased more than 2 times.

Apart from reducing water loss introduction into the composition of the filler increases the strength characteristics of the cured cement composition. So the strength in static bending of solidified samples of examples 3 and 4 was 7.7 and 9.0 MPa, respectively. For cement grade PCT-I-G without additives under the same conditions after 7 days of hydration (maturation) strength in static bending of the sample is equal to 7.0 MPa.

The concentration of russiauses the supplements DR-100 was established on the basis of the existing knowledge about the curing of the cement stone, linear expansion which should not exceed 3% (Kosterin VI Grouting materials and chemicals. - M.: Nedra, 1989). With a large expansion in the cement stone in the mountainous pressure cause internal stresses and microcracks, resulting in the destruction of the insulation material.

In addition to the expansion coefficient was taken into account the change in the adhesion of the cured stone to metal casing (see table 3).

Table 3
The influence of the content of extender additives on the properties of cured at 75C cement compositions.
# exampleThe content of the DR-100 (parts) per 100 parts SFG-BThe coefficient. LINEST. expansion, %Adhesion to metal, MPa
1230,150,23
1351,30,70
14102,01,30
1515 2,71,29
16204,41.11

Shown in table 3 data show that the optimum concentration range of the PD-100 is 5-15 parts: below 5 parts extending tamping of the material is negligible, and above 15 parts the coefficient of linear expansion becomes greater than the allowable 3%. In addition, as can be seen from the table, the increase in the content of the expanding additive to more than 15% leads to decrease adhesion of the cured composition to the metal.

With the use of phenol-formaldehyde resin SPI-B at lower temperatures (below 55C) unable to obtain dimensionally stable material in a reasonable time loss of fluidity necessary for carrying out the RIRs in wells.

Thus, the proposed polymer cement composition corresponds quality indicators, allowing to apply it to rose during the operation of drilling and high-temperature wells.

1. The grouting composition to isolate water production in oil and gas wells, consisting of a phenol-formaldehyde resin rezol type of curing catalyst, a mineral or organic filler, characterized in that the composition further comprises an activator process - resorce and expanding additive DR-100, and as the catalyst use ferrochromolignosulfonat FHLS-M in the following ratio of components, parts:

phenol-formaldehyde resin SPI-B100
ferrochromolignosulfonat FHLS-M1,0-10
resorcinol1,5-10
filler (white carbon black BS-120, or talc, or crumb rubber, or chalk, or barite)4-8
- expanding additive DR-1005-15

2. The grouting composition according to claim 1, characterized in that at temperatures above 110C in the composition is further added to 30 parts of a curing inhibitor - binder BP-40.



 

Same patents:

FIELD: oil and gas industry.

SUBSTANCE: isolation method of water influx to well involves pumping via tubing string to water influx interval of isolation compound, gelling agent and cement solution, technological exposure and development of well. Isolation compound contains the following, wt %: sodium silicate with silica module 2.6-5.0 4-20, water-soluble polymer 0.05-0.3, and fresh water is the rest. Water solution (10-15%) of chlorhydric acid in quantity of 0.5-5.0% of compound volume is used as gelling agent for isolation. Gelling agent is pumped separately after isolation compound is pumped and pumping is performed in cycles. During the first 1 to 3 cycles there used is aerated isolation compound and gelling agent; in next cycles there used is non-aerated isolation compound and gelling agent; then, cement mortar is pumped and process exposure is performed.

EFFECT: increasing efficiency of isolation works.

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17 cl, 7 dwg

FIELD: oil and gas production.

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2 tbl, 1 ex

FIELD: oil and gas industry.

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2 tbl, 1 ex

FIELD: oil and gas industry.

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20 cl, 2 dwg, 1 tbl, 1 ex

FIELD: oil and gas industry.

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EFFECT: reducing the costs for well construction and well flushing in cavern formation and caving conditions.

FIELD: construction.

SUBSTANCE: invention proposes compositions, capable of setting and including water and cement furnace dust. Compositions, capable of setting, may optionally include an additive, which contains at least one component of the group below: ash dust, slate, slag cement, zeolite, metakaolin and their combinations. Compositions, capable of setting, may be optionally foamed with gas. Also methods of cementing are proposed, which include the following operations: preparation of composition capable of setting; introduction of composition, capable of setting, into a section to be cemented; and making it possible to set and form a hardened mass in this area. Section to be cemented may be located over earth surface or in subsurface bed.

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35 cl, 25 tbl, 25 ex

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17 cl, 25 tbl

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34 cl, 1 ex, 1 tbl

FIELD: oil and gas industry.

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EFFECT: increasing insulation efficiency of gas wells in conditions of formations with abnormally low formation pressure, and increasing flow rate of the above wells.

2 ex, 1 tbl

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

FIELD: oil and gas chambers construction.

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EFFECT: higher efficiency.

1 ex

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.

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2 cl, 1 tbl

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

2 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 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.

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

EFFECT: higher efficiency.

2 tbl

FIELD: oil and gas extractive industry.

SUBSTANCE: method includes feeding water-isolating compound along tubing pipes, containing polyvinyl spirits and consisting of components forming an impenetrable zone in case of mixing in the bed, pressing it into bed, washing and exposure of well for forming of impenetrable zone, tubing column is lowered for 2-3 meters below perforation range, and into isolation range along tubing pipes hydro-repelling liquid is first pumped, in volume, exceeding volume of water-isolating composition in at least two times, water-isolating composition includes special liquid except from polyvinyl spirits, its pumping is performed in sequence - first goes polyvinyl spirits, then buffer liquid, special liquid, buffer liquid, repeating these operations until reaching required height of isolation interval and fixing of well-adjacent area, after that said pressing, washing of well and said polymerization exposure are performed.

EFFECT: higher efficiency.

1 dwg, 1 ex

Plugging mix // 2245989

FIELD: oil and gas production.

SUBSTANCE: plugging mix intended for cementation of oil, gas, and gas condensate wells under moderate and elevated temperatures contains 50-76% Portland cement, 20-40% finely ground quartz, and caustic magnesite powder.

EFFECT: reduced filtration and shrinkage of plugging mortar.

1 tbl

FIELD: oil and gas production.

SUBSTANCE: Portland cement-based composition contains, wt %: polymer 1-10, hardening accelerator 6-8. plasticizer 0.3-0.5, alumina cement 7-10, gypsum dihydrate and/or anhydrite 5-8, said polymer being selected from the group comprising: polyacrylamide, hydrolyzed polyacrylonitrile, polyvinyl alcohol, organosilicon liquid, latex and cationic bitumen emulsion, and said hardening accelerator being alkali or alkali-earth metal sulfates or chlorides.

EFFECT: improved properties, reduced shrinkage deformations, and under conditions resistance to fissuring.

2 cl, 2 tbl

FIELD: mining engineering, in particular improving of reservoir recovery.

SUBSTANCE: claimed composition contains (mass parts): resin 100; liquid curing agent (e.g., alkali solutions) 15.1-60; ammonium carbonate 0.1-9.9. Composition of present invention afford the ability to limit the water and sand inflow, to increase strength and permeability of formed reservoir.

EFFECT: improved reservoir recovery, increased turnaround time, reduced underground equipment in well.

2 tbl, 4 ex, 2 cl

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