Light-weight grouting mortar

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 cement mortars used in the cementing of gas, gas condensate and oil wells, complicated by the presence of loosely coupled, prone to fracturing of rocks, and rocks with low positive and negative temperature.

Known lightweight cement slurry [1], containing Portland cement, facilitating mineral Supplement - gidrofobizirovannogo clinoptilolite rock in the following ratio of components in the solution, wt.%:

cement 30,0-40,0

gidrofobizirovannym

clinoptilolite rock 13,0-23,0

water the rest

The disadvantages of this solution is its shrinkage during curing, resulting in deteriorating the adhesion of cement to casing strings and low for geocryological conditions of sedimentation stability.

The closest in composition and purpose cement is a solution of the reduced density [2], containing the grouting cement SNUB facilitating mineral Supplement - vermiculite.

A disadvantage of the known cement slurry is that the vermiculite is an inert filler, not involved in the hydration reactions of cement, therefore, does not increase its strength.

The objective of the invention is to improve the parameters of a lightweight cement slurry and stone, providing high-quality cementing in the range of permafrost), preventing annular manifestations, lifting cement to the wellhead.

The technical result of the claimed invention is to improve the sedimentation stability and strength of cement cement, reducing the contractions.

The essence of the invention is that the inventive lightweight cement slurry includes grouting cement SNUB facilitating additive - ceritadewasa rock clinoptilolite, actively participating in the formation of cement and water in the following ratio, wt.%: cement low temperature SNUB - 60,0-47,0; clinoptilolite - 6,6-11,8; water - the rest.

Comparative analysis of the prototype allows us to conclude that the proposed lightweight cement slurry is different from the known to the introduction of new components, namely clinoptilolite when the above ratio of the components, i.e. the claimed invention meets the criterion of “novelty”.

Cement cement SNUB contains: finely ground gypsum-free Portland cement clinker (90%), annealed solid residue soda production (10% of the content of clinker), plasticizing additive - NTF (0.1 to 0.13% of the weight of the dry mixture), the electrolyte is sodium carbonate (3.8 to 5.0% of the dry weight is th mixture). Cement production SNUB established in Sterlitamak JSC “Soda”.

The composition of zeolites are framework silicates, in particular, clinoptilolite - (Na, K)4Sa Al6Si30O7024 H2O. It is natural microporous frame silicate, in its structure there are four types of channels of capillary dimensions. The main structural parameters of clinoptilolite following: the effective diameter of the input Windows of 0.43-0.35 nm; the amount of free intracrystalline space of 30-40%. Clinoptilolite lies a powerful formations in many fields tseolitopodobnyh tuff (Sokolnice, Azami, Eastern Siberia, and others).

The effect of supplementation of clinoptilolite is not only to reduce the density of the solution, but also in reducing contraction and hardening of cement stone.

This is because in zeolites, as a rule, part of the silicon ions substituted for aluminum. This substitution leads to an excess negative charge, which should be more than offset by additional ion located in the intracrystalline cavities of the structure. In addition, ion-exchange centers can occur on the surface of minerals in connection with deviations from electroneutrality at the phase boundaries. The presence of a charge on the outer surface contributes to the interaction of particles of clinoptilolite with ions and what sociate Zola cement dispersion. Physico-chemical status of colloidal particles in the cement-zeolite solution meets the conditions subsequent formation of a strong individual contacts in the microstructure of the stone, the hydration process is constantly renewed on purified from tumors sites of the zeolite.

Because the grouting cement SNUB represented mainly calcium oxide, the solubility of which at low temperatures is high enough, the system assumes its interaction with the surface of the particles of clinoptilolite with the formation of hydrated compounds. Thus, clinoptilolite will facilitate the creation of lightweight cement slurry, forming a stone with increased strength and insulation properties.

A high content of active calcium oxide in the calcined solid residue soda production activates the process of hardening of gypsum-free Portland cement, increases sedimentation stability and provides expanding properties of the cement stone.

Comparison with known cementing slurries was performed for compounds that meet the requirements of GOST 1881-96 for density lightweight cement slurries.

The presented experimental data used cement grouting SNUB on STF-1-39-91 (“arcticmorneftegasrazvedka), zeolite on THE 113-12-98-852, the water in dobrovolny according to GOST 2874-82.

Comparison with known solution was produced according to the density, effective flowing property, odottelen, duration of seizure, cement slurry and strength formed of stone. All compounds (known and declare) have the same conditions of curing, the samples at a temperature of minus 2°and atmospheric pressure. Determination of the basic properties of the lightweight cement slurry and stone were carried out in accordance with GOST 267981-96, 267982-96 “Cement grouting”, “test Methods and methodology, proposed in [3]. The density of the cement slurry is determined by hydrometer AG-1, the flowing - in cone of lubricant additives, the timing setting device vetch, the tensile strength of cement stone on a bend, on a test machine to the STAND-100, water segregation using a measuring cylinder.

To identify distinctive features and technical of the modified mass ratio of ingredients in a wide range of values.

Lightweight cement slurry is prepared as follows. The required amount of zeolite is mixed with cement SNUB, and the mixture is then shut water at a given water-cement ratio.

Example:

To prepare 1 kg lightweight cement slurry (composition No. 6) it is necessary to take 601 g of cement SNUB mixed with 66 g of zeolite (clinoptilolite) and shut 333 g of water.

The composition is stirred for 3 minutes is, then determine its density, flowability, water segregation. For definitions of terms, tensile strength of cement stone bending the prepared solution is poured in a mold and maintained at a temperature of minus 2°C. Backfill stone are tested for strength after 2 days from the beginning of his mixing. The results are given in the table.

The prepared structure 6 has a density of 1660 kg/m3the flowability - 180 mm, start setting after 7 h 15 min, the end of the stiffening - 10 hours, the tensile strength of stone on the curve is 0.95 MPa, water segregation of 1.4%. Shrinkage deformation of the cement was observed.

Examples of the preparation and testing of other compounds listed in the table, the same algorithm.

To identify distinctive features and positive effect changed the mass ratio of ingredients in a wide interval of values. It is established that the mortar compositions No. 6, 10, 14, 15 are optimal.

As can be seen from the table, declared cement slurry has low water separation from 0.0% (composition 14) to 1.4% (6) at a density 1610-1660 kg/m3. Strength of stone, formed from the inventive cement is in the range of from 0.90 MPa (solution No. 15) to 0.97 MPa (solution No. 10) at a density 1510-1640 kg/m3.

The proposed grouting solution allows you to improve the shape quality of the low-temperature fixing wells and prevent neopolyol cement to wellheads, taking place during cementing known compounds.

Comparative characteristics of known and proposed a lightweight cement slurry (test temperature -2°)
no PPThe composition of the cement slurry, wt.%Density, kg/m3Fluidity,

mm
The hardening period, the hours-minutesStrength, MPa

·(2 day)
The water segregation, %
 SNUBLightweight and strong. additiveWaterStartEnd
Known lightweight cement slurry (prototype)
1.to 59.4Vermiculite

3,1
37,516002005-2511-100,907,4
Offer a lightweight cement slurry
2.63,43,.333,317401906-208-151,102,4
3.to 59.43,137,5620 2406-309-301,00the 4.7
4.55,92,941,215102506-359-550,906,0
564,37,128,617801705-408-251,060,0
6.60,16,633,316601857-1510 : 00 am0,951,4
7.56,36,237,515502407-2010-200,814,1
8.52,95,941,214902507-2010-400,855,3
9.60,710,728,617501706-309-001,00,0
10.56,710,033,316401856-509-350,970,5
11.53,19,4 37,515302307-1010-300,912,3
12.50,08,841,214702507-2510-450,883,6
13.57,114,328,617201656-509-451,00,0
14.53,413,333,316101806 : 45 a.m.10 : 00 am0,920,0
15.50,012,537,515102157-4010-300,900,9
16.47,011,841,214402407-2010-500,802,4

Sources of information:

1 A.S. USSR №1099051, CL E 21 In 33/138.

2 Ovchinnikov V., Frolov A.A., A. A. Shatov, Vyakhirev V.I. Sorokin V.F., Ovchinnikov PV Salt and cement compositions on the basis of secondary material resources of production of soda. - M.: OOO “Nedra-business Center”, 2000. - 214 S.

3. Khlusov A.A., Lanew E.N., Nikulin VA and other Features tested plugging the s materials for low-temperature wells// Overview. Series Drilling of gas and gas condensate wells. - M.: Negatron, 1989, No. 2, 30 S.

Lightweight cement slurry comprising cement cement SNUB facilitating mineral Supplement - ceritadewasa rock and water, characterized in that as ceritadewasa breed contains clinoptilolite in the following ratio, wt.%:

Cement SNUB 47,0-60,0

Clinoptilolite of 6.6 to 11.8

Water the Rest



 

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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.

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 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

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EFFECT: higher efficiency.

1 tbl

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

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2 tbl

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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.

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2 cl, 2 tbl

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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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