Plugging composition

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

 

The invention relates to the composition of the cement composition and may find application in the oil and gas industry for well casing and during repair and insulation works.

Known grouting composition containing, in parts by weight: Portland - 100, pam - 0.15-0.25, sodium sulfate - 0,2-0,4, benazolin - 0,1-0,5, water - other (RU # 2035585, publ. 20.05.95).

The closest analogues to the claimed invention is a cement composition comprising, in wt.%: Portland - 61,12-61,96 and mixing water containing water-soluble polymer is polyacrylamide - 0,12-0,18, the hardening accelerator is calcium chloride - 0,62-1,83 (see EN No. 93015575, publ. 27.01.96).

The aim of the present invention is to improve the rheological properties, reduced shrinkage deformation, increasing the fracture toughness.

This goal is achieved due to the fact that cement composition comprising Portland cement, a polymer, a curing accelerator and a plasticizer, optionally contains aluminous cement and dowolny gypsum and/or anhydrite in the following ratio, wt.%:

Polymer - 1-10

the setting accelerator - 6-8

plasticizer - 0,3-0,5

aluminous cement - 7-10

dowolny gypsum and/or anhydrite - 5-8

Portland - rest

Moreover, as the polymer can be used polyacrylamide, gidrolizom the config polyacrylonitrile, polyvinyl alcohol, latex, silicone fluid, cationic bitumen emulsion. As the hardening accelerator can be used chlorides and sulphates of alkaline or alkaline earth metals.

For preparation of the cement composition is used:

Portland PCT-D0 according to GOST 1581-96, aluminous cement “400” according to GOST 969-91, natural gypsum stone of Argutinskogo field corresponding to GOST 4013-82. Stone plaster and gipsoangidritovye for binders.

Polymers:

Polyacrylamide beyond 6-01-1049-81, hydrolysed polyacrylonitrile (gipan) TU 6-01-166-74, polyvinyl alcohol - chain polymer is dissolved in water, has a high resistance to the action of organic solvents. Films of polyvinyl alcohol have a high surface hardness, gas impermeability, latex is a product of copolymerization of butadiene with styrene, representing liquid milky white in color density of 1.07 g/cm3containing solid matter in the amount of 35.5% is produced at the Yaroslavl plant of synthetic rubber, gstelement “Synthesis”cationic bitumen emulsion according to GOST 18659-81. Emulsion bitumen road. As the hardening accelerator used technical sodium sulfate on THE 113-46-18-20-89, the technical will stifle salt is sodium chloride. As plasticizers used superplasticizer C-3, which is a product of condensation β-naphthalenesulfonate with formaldehyde and containing oligomeric chains of different molecular weight produced in accordance with TU 6-14-625-80 as 30-40% aqueous solution and in the form of a fine powder brown and lignosulfonate modified technical - LSTM.

The grouting composition is prepared by mixing the dry components with the subsequent zatvoreniem water to obtain a water/binder relations of 0.45 to 0.6. The compositions of the cement composition and its properties are shown in tables 1 and 2

Table 1
No.Portlander.Glinted.gypsumpolymeraccelerateThe layer.
179,777160,3
276,686360,4
372,696570,4
470,596780,5
569,7751080,3

In example 1 using polyacrylamide, dowolny gypsum, sodium chloride and plasticizer LSTM, in example 2 use of gipan, the mixture dowolnego of gypsum and anhydrite in the ratio of 1:1, sodium sulfate and LSTM. Example 3 use of polyvinyl alcohol, dowolny alcohol, plasticizer S-3 and sodium chloride, in example 4 use of cationic bitumen emulsion, gipsoangidritovye stone ratio dowolnego of gypsum and anhydrite in 1:0.3, the plasticizer S-3 and sodium sulfate, in example 5, - latex, dowolny gypsum, sodium chloride and plasticizer LSTM.

Table 2
No.Rheological properties (flowability, mm)Extension (+),%Casinoroyale Rtechnology/RCW.
Composition 1210+0,20,20
Part 2200+0,180,21
Part 3200+0,180,23
Part 4213+0,220,24
Part 5218+0,150,22

As can be seen from table, all the compositions are non-shrink, high crack resistance (the ratio of the Flexural to compressive strength - Rtechnology/RcJ.), with sufficient fluidity that allows for normal pumping the cement composition into the well.

1. Cement composition comprising Portland cement, a polymer, a curing accelerator and a plasticizer, characterized in that it contains at least one polymer from the group of: polyacrylamide, hydrolyzed polyacrylamide, polyvinyl alcohol, silicone fluid, latex, cationic bitumen emulsion and additionally aluminous cement and dowolny gypsum and/ or anhydrite in the following ratio, wt.%:

The polymer 1-10

The setting accelerator 6-8

The plasticizer 0,3-0,5

Aluminous cement 7-10

Dowolny gypsum and/ or anhydrite 5-8

Portland Else

2. Grouting composition according to claim 1, characterized in that it contains as the hardening accelerator sulfates or chlorides of alkali or alkaline earth metal.



 

Same patents:

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.

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EFFECT: higher efficiency.

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FIELD: oil and gas production.

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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

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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.

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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.

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 extractive industry.

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EFFECT: higher efficiency.

2 tbl

FIELD: oil extractive industry.

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EFFECT: higher efficiency.

1 tbl

FIELD: oil extractive industry.

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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.

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

2 tbl, 4 ex, 2 cl

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