SU1254139A1 - Plugging composition - Google Patents

Description

"

The invention relates to the drilling of oil and gas wells, in particular to cementing.

The purpose of the invention is to increase the penetration of the cement stone while simultaneously improving the rheological characteristics of the cement slurry.

When using self-absorbing slag from ferrochrome production as an addition to cement-chalk mixture in an amount of 20–40% of the total weight of the mixture, strong and rheological properties of the tampon mixture, i.e. Compressive strength increases by 18.6%, with bending by 50%, the water demand of the mixture decreases 1.4 times. Improving the rheological properties of the tamponase mixture leads to significant savings in Portland cement.

To prepare the cement mixture, honey, a white-white powder with a density of 2.7- 2.9 g / cm of the following chemical composition, wt.%, Is used:

0.5-0.6 0.2-3.0 0.2-1.5

CaO 52-60

MgO,

SiO,

,

Fe, 0

0.2-1.0

SO,

0.1-0.8

rnin38-44

ZamoraStagousCh slag of ferrochrome production is a fine powder of light gray color, from the course of production of ferroalloys with a density of 2.76 g / cm of the following average chemical composition, mas: CaO50.5

MgO11, 1

Al, 0j5.1

FeO0.66

SiO 26.2

 nnn Else

The mixture is prepared from the indicated components in predetermined proportions, swept up, shut off with water (water percentage is 0.5), then the resulting solution is treated in a disinfector with the aim of actively homogenizing and activating the incorporating components, from which samples are molded. balrchka of 16 cm in size and tested for strength after 2 days of curing in normal conditions at 22 C.

392

The data of physical and mechanical tests are given in the table.

When introducing into the mixture of self-diffusing slag, the production of ferrochrome pains of 40% and chalk 50% of the total mass of the mixture decreases its strength characteristics significantly.

The introduction of a production of ferrochro ya less than 20% into a mixture of self-diffusing slag from the slag and less than 30% of the mixture’s mass leads to a decrease in its rheological characteristics, i.e. the water demand increases significantly, the flowability decreases.

The cement slurry containing, in wt.%: Portland cement 50, chalk 30, self-dissolving slag 20, containing 50% of additives, at filling B / C - 0.7, spreading 23 cm, strength of 2-day samples hardening under normal conditions during bending is equal to 12 kgf / cm, when compressed it is 4Ocgs / cm.

A mixture comprising, in wt.%; Portland cement 50, chalk 50, when mixed with the same amount of B / C 0.7, has a flowability of 23 cm, flexural strength of 8 kgf / cm, and 14 kg.s. / 2 cm hardening under compression, under normal conditions at.

The cement slurry containing, g: Portland Cement 500, chalk 300, self-dissolving slag 200, mixed with water at B / C 0.5, has a flowability of 18 cm and a density of 1.54 g / m. Flexural strength is 12 kg / cm, while compression is 40 kg / cm. The cement slurry, including, g, Portland Cement 300, chalk 400, self-dissolving slag 300, after being filled with water at B / C 0.5, has a flowability of 18 cm. From the treated solution, the bead specimens of size 4 "4 J6 cn are formed and tested on . strength after 2 days of curing in normal conditions at 22 ° C. Flexural strength is 10 kg / cm, while compression is 32 kgf / cm.

Grouting mixture including, g; Portland cement 200, chalk 400, self-disintegrating slag 400, after shutter with water at B / C O, 5 has a flowability of 19 cm, a density of 1.43 g / cm. Sample beams are formed from the solution. 4 "4 -16 cm in size and are tested for strength after 2 days of curing under normal conditions at.

0 50

0 30

20

1.40 14-50

1.42 14-50

G, "2: 14-30

1.48 14-00

1.50 12-10

G, 54 12-00

1.54 10-10

1.54.10-00

I, 54 9-40

Prototype (B / C ° 0.7). 23.0 1.60 12-4514-15

The proposed mixture (B / G 0.7) 25.0 1.54 12-1013-55

Compiled by L. Bestuzheva: Editor K. Voloshchuk Tehred I. Popovich Corrector L. Patay

Order 4695/35 Circulation 548 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, F-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., A

8.0

14.0

12.0

40.0

Claims (1)

GRINDING MIXTURE containing Portland cement and chalk, about t l and -. I want to make sure that, in order to increase the strength of the cement stone while improving rheological characteristics of grouting- solution, it additionally contains self-scattering slag pro- ferrochrome production next ratio of ingredients wt.%: Portland cement 10-50 a piece of chalk 30-50 Self-scattering production slag. ferrochrome 20-40 and self-scattering slag production ferrochrome has following average chemical composition, wt.%: CaO 50,5 MgO 11.1 S A1 „0, 5.1 Z 3 FeO 0.66 ω S10 ₂ to about _{5 hours} 26.2 5.2 from nnn Rest m Bsha sl tasA so o