SU726307A1 - Cementing composition - Google Patents

Description

.1 The invention relates to the production of cement slurries, in particular for cementing wells, and can be used in oil and gas development, geology and mining. Known cement slurries, including cement, water and additives that regulate water loss and rheological properties of cement slurries, such as flowability. These additives include: condensed sulfite alcohol (BSCP) ,. oxyl starch, carboxymethylcellulose (CMC), hypan, nitrolignin, polyacrylamide (PAA), polyvinyl alcohol, metas ,. PFLH, MOPTs polymers and POE 1. However, these solutions are not very effective, since, along with a reduced value of water loss, they have a low spreadability. The closest to the invention in composition is a cement slurry for cementing wells containing cement, water, and the addition of MMC-BTR (modified methylcellulose) 2 However, the addition of MMC-BTR is poorly soluble in water, foams the solution, is expensive and scarce. The purpose of the invention is to reduce water loss and increase spreadability. The goal is achieved by cement and water based cement slurry, in which polyelectrolyte with general amino group I methylenephosphone grouping is used as a water loss reducing agent; BUT-P-OH where p f- with the following ratios of ingredients, wt.%: 66,625-65,610 Cement Amphoteric polyelectrolyte with aminomethylene phosphonic group, 035-1,050 with firo Remaining. Preparation of cementing: The solution is carried out as follows. The quantity of water-soluble polyelectrolyte with aminomethylene phosphonic group is introduced into the calculated quantity. Then, according to a known technology, cement is mixed in with a prepared aqueous solution. The parameters and properties of the cement slurry are determined according to GOST 1581-63. The results of the experiments on the composition of the prototype and the proposed composition are given in table. 1 and 2.

 Table 1

As can be seen from the table. 1, when it is unknown: the reading supplements of the proposed reagent are reduced and the dosing of the tampon solution of the solution is increased and its absorption increases, i.e. rheological properties are improved.

From tab. 2 it can be seen that with increasing the MMC-BTR supplement above 0.2%, the cement slurry thickens: spreadability becomes less than 18 cm, i.e. it does not require GOST 1581-63, the initial consistency (according to CV-4) is above 30 Yed . with the addition of the MMC-BTR of -0.3% and 8e 1. - at 0.2%. In both cases, the thickening time is 10 min. The thickening time with the addition of 0.1% - 1 hour. 23 min .In increasing, the concentration of MMC-BTR in the cement slurry deteriorates its rheological properties.

T a b b a

. From the above examples, it follows that the proposed cement slurry significantly exceeds the prototype, reducing the yield by 2 times and increasing the spreadability of the cement slurry from 18.3 cm to a value greater than 25 cm. ..

Amphoteric polyislectrolyte is used as an additive. Its properties are as follows: nitrogen content in polyelectrolyte is 8.8%, phosphorus is 16.8 IR spectrum, art: 945 (deformation oscillations P-OH), 1165 (stretching vibrations), 1650 (zwitterion) O

II

-KN-SNO-P-O

1 1 he

 product of the synthesis of a 50% aqueous solution of a dark maroon polyelectrolyte viscous liquid with

density of 1.32 g / cm3; diluted solutions are yellow. After cleaning and drying in a desiccator over phosphorus pentoxide, a yellow-orange crystalline product is obtained that is hygroscopic, highly soluble in water, has weakly acidic properties, and decomposes. This polyelectrolyte improves rheological properties and reduces the water loss of the cement slurry. The cost of an amphoteric polyelectrolyte is lower than the cost of an IMC-BTR and is 2500 rubles. for 1t

The economic effect of the application is about 20 thousand rubles per year.

Invention Formula

Cement slurry for cementing wells, containing as a base, cement slurry, water and a fluid loss additive, which is used in order to increase flowability, using a polymethrolyte with aminomethylene phosphonic grouping as an additive for fluid loss. %

Cement

66,625-65,610

Polyelectrolyte with aminomethylene Phosphonic group 0, 035-1,050

0 Water Else.

Sources of information taken into account in the examination

1. Mariampolsky N.A. et al. Water loss reducers for cement thieves for cementing cold wells. Ser. .Drilling. M., ed. VNIIOENG, 2, 1972.

2.Limanovsky V.M. et al. Modified methylcellulose — effective, reducing fluid loss of cement slurries. Ser. Drilling. M., ed. VNIIOENG, 9, 1976 (prototype).

Claims (1)

The formula of the invention The cement slurry for cementing wells, containing cement slurry, water and a fluid loss reducing agent as a base, characterized in that · in order to increase the spreadability, a polyelectrolyte with an aminomethylene phosphonic group is used as a fluid loss reducing additive in the following ratio of ingredients, ^ EU. %: Cement 66.625-65.610 Aminomethylene phosphate polyelectrolyte group 0,035-1,050 Water The rest.