Combined reagent for cement slurries

 

The invention relates to the fastening of oil and gas wells and can be used for bulk blending or cement slurries in the first place lightweight curing at low and moderate positive temperatures. Combined reagent for cement slurries, including aluminum sulfate, additionally contains aluminum hydroxide chloride, polyaluminium hydroxide chloride in the following ratio, wt.%: aluminum hydroxide chloride, polyaluminium hydroxide chloride 40-55, aluminum sulfate 45-60. The technical result - developing reagent, providing a stable technological properties of cement slurries regulating the dielectric strength and setting time. table 1.

The invention relates to the fastening of oil and gas wells and can be used for bulk blending or cement slurries in the first place lightweight curing at low and moderate positive temperatures.

A known solution on the basis of Portland cement and water, which includes an integrated reagent hydrochloric aluminum [1].

Combined reagent in this solution the Yu is the grouting composition, containing cement, additive-reagent and water, and in addition it contains a complex reagent, consisting of several components in the following ratios, wt.%: aluminum hydroxide 0,45-0,7; sodium aluminate - 0,9-1,5; aluminium sulphate - 0,45-0,7 [2].

The disadvantage of a complex of a reagent of the prototype is its lack of ability to provide a stable technological properties of the cement slurry.

The objective of the invention is to develop a reagent that provides a stable technological properties of cement slurries, especially lightweight, hardening at low and moderate temperatures.

The problem is solved in that the complex reagent for cement slurries, including aluminum sulfate, additionally contains aluminum hydroxide chloride, polyaluminium hydroxide chloride in the following ratio, wt.%: Aluminum hydroxide chloride, polyaluminium hydroxide chloride - 40-55 Aluminum sulfate 45-60 the Totality of the claimed features provides the reagent ability to control such properties of cement slurry as insulating ability, time setting, stability, sedimentation and uniformity.

That is), provides deformation properties of the cement stone. The introduction of the reagent ions SO42-in the claimed amount significantly increases the number of ettringite, the crystals of which are reinforced delevigne the slightly basic hydrosilicate and thereby significantly increase the rate of hydration of cement mortars, reducing the duration of the seizure.

Anions of strong acids Cl-and SO42-have a coagulating effect on the dispersion system and it provides integrated reagent ability to influence the properties of the cement slurry in the manner described above.

Combined reagent is prepared by mechanical mixing in the specified proportions of its constituent components. To the obtained reagent depending on the geotechnical conditions of the wells may be added known plasticizers, accelerators, and fluid loss in known quantities.

Example 1 Into the mixer with spout enter 6,0 kg of dry aluminum sulfate (TU 12966-85) and with constant stirring served 4.0 kg of dry aluminum hydroxide chloride, polyaluminium hydroxide chloride (TU 6-09-05-14-56-96). Mix the components within 20 minutes. The received complex reagent in Yo and test it according to the existing industrial standards and state Standards. As knitting take, for example, a lightweight cement containing 25% of the microspheres, for example, which is more indicative of the effectiveness of the obtained reagent.

The test results of cement slurry are presented in table 1 (experiment 1).

Example 2 Into the mixer with spout injected 4.5 kg of dry aluminum sulfate and with constant stirring served 5.5 kg of dry aluminum hydroxide chloride, polyaluminum hydroxide chloride. Mix the components within 20 minutes. The received complex reagent in the amount of 1% by weight of cement injected into the liquid mixing cement slurry. Prepare cement slurry and test it according to the existing industrial standards and state Standards. As knitting take, for example, a lightweight cement containing 30% of the microspheres.

The test results of cement slurry are presented in table 1 (experiment 2).

The table shows that at low positive temperatures lightweight cement mortars harden quickly enough, the deformation properties of cement stone rise.

Despite the diluted dispersion medium containing 1.0% reagent, water segregation remains zero. The solution sedimentation sustainable.

Sources in the Soberania

Combined reagent for cement slurries, including aluminum sulfate, characterized in that it additionally contains aluminum hydroxide chloride, polyaluminium hydroxide chloride in the following ratio, wt. %: Aluminum hydroxide chloride, polyaluminium hydroxide chloride - 40-55 Aluminum sulfate 45-60

 

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