Plugging mix

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

 

The invention relates to the oil and gas industry and can be used for cementing oil, gas and gas condensate wells in the conditions of moderate and high temperatures.

Known cement mixture comprising Portland cement and silica sand [1]. The disadvantages of this mixture, along with a slow chemical interaction of quartz sand with Portland cement hydration products, is a high density cement slurry, due to its low water content.

Closest to the technical essence and purpose to the alleged invention is a cement mixture PCTP 50-150, including Portland cement, ground quartz sand and manufactured according to THE 39-0147-001-170-97 and GOST 1581-91 [2]. The specified mix though and is characterized by high reactivity of ground quartz sand with Portland cement hydration products, but it has such disadvantages as increased filtration rate and shrinkage of cement slurry. High speed filtering the solution promotes the formation of permeable cement, shrinkage - the emergence of oil and gas shows were observed in the period of the RFQ. Together, these shortcomings lead to the deterioration of the mounting holes in the conditions of moderate and high temperatures.

In the claimed invention R is sales the goal of improving the quality of well casing by reducing the filtration rate and the shrinkage of the cement slurry.

The technical result of the invention is to develop a heat-resistant, non-shrink grouting mortar with reduced filtration rate.

This object is achieved in that the cement mixture comprising Portland cement and silica additive, as the silica-containing additive contains quartz powder pulverized grade “B”, and further comprises a caustic magnesite powder PMC-87 at the following content, wt.%:

Portland cement - 50-76,

quartz powder pulverized grade “B” - 20-40,

powder caustic magnesite PMC-87 - the rest.

Quartz powder pulverized grade “B” are produced according to GOST 9077-82 and is a gray powder density of 2600 kg/m3and specific surface 4708 cm2/, Granulometric composition, %: residue on sieve No. 016-0,80; residue on sieve No. 010-2,30; residue on sieve No. 0063-9,50; pass through a sieve No. 005-83,30. Mineralogical composition, wt.%: silicon oxide (SiO2) 98,30; metal iron (Fe meth) 0,40; aluminum oxide (Al2O3) 0,80; calcium oxide (Cao) of 0.15.

Powder caustic magnesite PMC-87 is obtained by dust generated during the production of sintered magnesia powder is produced according to GOST 1216-87.

It is used as helices the CSO product for various purposes and binder. The powder is produced faction 2-0; 009-0 mm Mineralogical composition represented by wt%: magnesium oxide is not less than 87; calcium oxide is not more than 1.8; the silica is not more than 1.8; oxide (iron + aluminum) - not more than 2.2.

High dispersion of ground quartz dust contributes to the formation of a less permeable filtration sludge cement slurry and accelerate its reaction with the products of hydration of Portland cement, especially at moderate temperatures. Thanks to the combination of cement mixture of ground quartz dust and powder caustic magnesite helps increase stability, reduce shrinkage and a filtration rate of cement slurry.

Preparation of grouting mixture is carried out centrally in the shop of dry cement compositions. For example, in the mixing chamber alternately load 630 kg of Portland cement, 300 kg of quartz ground pulverized grade “B” and 70 kg of caustic magnesite powder PMC-87 to obtain a mixture in the amount of 8000 kg. Then the components are mixed for 30-40 min and cooked homogeneous mixture of the dried compressed air is fed into cement trucks or bins cementoossifying machines. Optionally, in field conditions is more repacking a mixture of one cementarnica Inoi machine to another.

Comparative data properties of the proposed cement mixture and of the prototype shown in the table.

In our experiments we used Portland cement sandy PCTP 50-150 on THE 39-0147-001-170-97 (prototype), and a mixture of Portland cement PCT 1-100 (according to GOST 1581-96) with quartz crushed, pulverized grade “B” (according to GOST 9077-82) and caustic magnesite powder PMC-87 (according to GOST 1216-87) fractions 009-0.

Were taken known tamping mixture and three part cement mixture in accordance with the invention (Portland cement, ground quartz dust grade “B” and the caustic magnesite powder PMC-87) with the boundary and the average value of the components. Preparing samples of cement mixtures, determination of density, water separation, shrinkage of cement slurry and strength of cement was produced in accordance with GOST 26798.0-26798.2-96.

The filtration rate of cement slurry was measured in accordance with the methodology proposed in [3] and was expressed by the value of the conditional filtering for 30 minutes

The data in the table show that the proposed cement mixture with the optimum ratio of components has better properties than known: cement slurry is characterized by a lower filtration rate (average 45%) and minimal shrinkage (up 1%).

Sources of information and

1. Ustanovki, Remalia, IfElse. Reference guide backfill materials. - M.: Nedra, 1987, s-136.

2. THE 39-0147-001-170-97. Portland cement sandy. - NPO Burenie, Krasnodar, 1997

3. RD 39-0014001-767-2000. Instructions for fastening of oil and gas wells, Moscow, 2000

The grouting mixture comprising Portland cement and silica additive, characterized in that as the silica-containing additive contains quartz powder pulverized grade “B”, and further comprises a caustic magnesite powder PMC-87 at the following content, wt.%:

Portland cement 50-76

Quartz powder pulverized grade “B” 20-40

Powder caustic magnesite PMC-87 Else



 

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