SU1654540A1 - Grouting mixture - Google Patents

Abstract

The invention relates to the drilling and exploitation of oil and gas wells. The goal is to provide heat resistance and reduce the permeability of the cement stone under cyclic heating to 400 ° C while simultaneously increasing its adhesion to casing pipes. The backfill material contains the following components at their ratio, wt.%: Cementing portland 55-77; quartz sand 20- 35, synthetic lime-alumina slag 3-10. The latter is a waste when refining steel. The addition of lime-alumina slag contributes to the formation of hydro-garnet type minerals most resistant at 350 410 ° C. When preparing the cement material, first sand and slag are ground together, then water is added and the table is thoroughly mixed.

Description

The invention relates to the drilling and operation of oil and gas wells and can be used in the application of thermal methods to enhance oil recovery.

The purpose of the invention is to increase the heat resistance and reduce the permeability of the cement stone with cyclic heating up to 400 ° C while simultaneously increasing its adhesion to the casing.

Backing material contains components in a ratio,% in May:

Cement Portland cement 55-77 Quartz sand 20-35

Slag synthetic lime-alumina3-10

Synthetic lime-alumina slag is a waste in steel refining and has the following chemical composition, wt.% 7-10. A1203 35-37, CaO 40, MDO 8; FeO 5, S 0.7; impurities - up to 1.3

The addition of synthetic calciferous alumina slag to method i formation of hydrogranate type minerals most stable at 350-4 Synthesis of these minerals is possible if the modulus of basicity in the material is

.. Cao Mo ST02

- 1 15

MO

m2. “8 activity spoons is equal to

-0.1.

The grouting material, when it contains a synthetic limestone-alumina slag in the specified quantity, has exactly such parameters. In addition, the formation of minerals of hydroelectric type is accompanied by a reduction in gel-like pores, which reduces the permeability of the cement stone.

In case of cyclic warm-ups during 0 cycles, the grouting stone is

with

about

2 g

about

This material has stable physical and mechanical properties. In addition, when synthetic limestone-alumina slag additives are added to the cement material in the contact layer of the cement stone with iron-containing minerals in the casing, the single calcium aluminate with iron oxides reacts chemically. As a result of the chemisorption of this mineral, calcium hydroaluminorite is formed on the surface of the metal (steel), which causes an increase in the adhesion force of the stone to the surface of the metal (casing), which ultimately results. determines the amount of adhesion.

Over the entire temperature range of 20-300 ° C, the grouting stone has high adhesive characteristics.

In tab. 1 shows the properties of the solution and the cement stone.

PRI me R 1. To prepare 1 kg of grouting material, 700 g of grouting portland cement, 250 g of quartz sand and 50 g of synthetic lime-alumina slag are needed. First, a joint grinding of slag and sand is carried out. Then, 300 g of the obtained slag-and-sand mixture is mixed with 700 g of cement Portland cement. Then, to the obtained 1000 g of material, 420 ml of water are added. The prepared cement slurry is poured into the molds to form standard samples of cement stone. The resulting cement stone has the following properties:

Strength, MPa, after 24 h at 22 ± 2 ° С:

bend1,3

compression1.8

after the 1st cycle of thermal exposure:

bend 10,6

compression316

after the 10th heat cycle:

bending 11,3

compression 34.5

15 2

Permeability K x Yu-, m, when tep

fishing effects:

After the 1st cycle 0.04

after the 10th cycle 0.03.

PRI mme R 2. To prepare 1 kg of grouting material, 650 g of grouting portland cement, 270 g of quartz sand and 80 g of synthetic lime-alumina slag are needed. First, a joint grinding of slag and sand is carried out. Then 350 g of obtained slag dough

5 0 5

0

five

0

five

Noah mixture is mixed with 650 g of cement Portland cement. Then, to the obtained 1000 g of material, 420 ml of water are added. The prepared cement slurry is poured into the molds to form standard samples of cement stone. The resulting cement stone has the following properties:

Strength, MPa, after 24 h at 22t ± 2 ° С:

bend1,4

compression2.0

After the 1st cycle of thermal exposure, bending 11.0

compression 32,0

After the 10th cycle of heat exposure

bending 11.40

compression 36,7

Permeability K x, under thermal effects:

after the 1st cycle 0.01

after the 10th cycle0.02

EXAMPLE 3. To prepare 1 kg of grouting material, 550 g of grouting portland cement, 350 g of quartz sand and 100 g of synthetic lime-alumina slag are needed. First, a joint grinding of slag and sand is carried out. Then, 450 g of the resulting slag – sand mixture is mixed with 550 g of cement Portland cement. Then, 450 ml of water is added to the obtained 1000 g. The prepared cement slurry is poured into the molds to form standard samples of cement stone. The resulting cement stone has the following properties:

Strength, MPa, after 24 h at 22t ± 2 ° С:

bend 1,5

compression2,1

after the 1st cycle of thermal exposure:

bending 11,2

compression34,1

after the 10th heat cycle

bending 11.8

compression38.2

Permeability, K x. m2, with thermal effects:

after the 1st cycle0.02

after the 10th cycle 0.01

The use of exorbitant values of the proposed grouting material changes the magnitude of the modulus of basicity and the modulus of activity, as a result of which the conditions for synthesizing hydrogranes and

the physical and mechanical properties of the stone are deteriorated.

In tab. 2 presents the test results of cement stone for adhesion to steel (tear-off method).

As can be seen from Table 2, the bonding force of the cement stone with the introduction of lime-alumina slag increases by more than 40%.

The use of the proposed cementing material makes it possible to increase the tightness of the well annular space during thermal impact on the formation and to reduce the number of repairs during operation.

0

five

Claims (1)

The invention has a backing material, including backfill Portland cement, quartz sand and slag, characterized in that, in order to provide heat resistance and reduce the permeability of backfill stone with cyclic heating up to 400 ° C while simultaneously increasing its adhesion to casing pipes, it contains slag as a slag synthetic lime-alumina in the following ratio, wt.%: Cement Portland cement 55-77 Quartz sand 20-35 Synthetic lime-alumina slag3-10 Table I 11,31,810,631,60,04 21,42,011,032,00,0 31,52,111,234,10,02 41,11,68,817,91,34 Continuation of table 1