SU909124A1 - Composition for cementing high-temperature oil and gas wells - Google Patents

Description

one

The invention relates to the oil field business, to the construction of oil and gas wells and can be applied, primarily, in the attachment of high temperature wells.

Portland cement-based cement slurry is known in which tartaric acid (BCC) is used as a setting retarder, which can effectively slow down the setting of cement slurries to 18 ° C HP.

However, VKK is an expensive reagent (1 ton costs 6,000 rubles) and an extremely scarce material that only partially meets the need for it.

Known cement slurry, containing in its composition dopazkumzamellitel - reagent L-7. Reagent L-7 is a very effective moderator, suitable for well cementing.

In a wide range of temperatures from 75 to 250C 2.

However, due to the complexity of the technology, the existing volume of production cannot satisfy the needs of the oil industry. In addition, it is relatively expensive (1 ton of L-7 reagent costs 2300 rubles).

Also known is the cement slurry for cementing high-temperature oil and gas wells, which contains cement oil, water, and a moderator additive — hypane with brompeak, which is applicable for fixing wells to a temperature of 3.

However, hypan thickens the grouting solutions and is relatively expensive.

The purpose of the invention is to increase the heat resistance of the solution to 250 ° C while reducing its cost.

This goal is achieved by the fact that the solution additionally contains green syrup - production waste

glucose in the following ratio of ingredients, weight:

Grouting cement Green treacle 0 ,, Chrompik0.05-0.5

WaterEverything

Green treacle is a waste product of glucose production and is produced according to Specification 18 of the Ukrainian SSR 15-75. In appearance, it is a dark brown syrup-like liquid with a specific odor, it is well soluble in water. By chemical composition, it is a mixture of the products of hydrolysis of glucose starch, products of glucose reversion and incomplete hydrolysis of starch. Green treacle is non-toxic, used in medicine. The cost of 1 ton of green molasses 127 rubles. Introduction of heat resistant retarder

the solution is exceptionally simple.

Green molasses and brompeak are dissolved in the water on which the cement slurry is prepared (from portland cement, slag cement).

Studies show that these supplements of green molasses and chromopic allow slowing the start of the setting of cement slurries at 80250 ° C to 3 hours.

In tab. Figure 1 shows the effect of PZH on the physicomechanical properties of cement mixtures.

Table 1

0,

0.1

Portland cement

0.6

0.12 2.8 0.15 3. 0.17

0.04

0.15

ShPTsS-120

0.06

0.15 0.18

0.2

0.6 0.22

0.32

0.2

ShPTsS-200

0.6 0.2

1.0 0.3 0.4

1.2

2. 0.5 Note. Chromic additives are given in percent.

1.80

80 80

21

1.80

22

1.80

21,100

300

1.80

22.5 100 300

1.81

23 120 300

1.81

23 400 1 130 80 80

18

45

1.78

45

18

1.78

one

45

1.78

18,100

300

45

18

1.78 100 300

45

1.78

19,400,130

45

20,160

1.79 500

45

19,160

1.79 500

, 45 160

19.5

1.79 500

, 45 180

20

1.79 500

45

20

1.79 200 500

45

1.80

21 600 220

45

1.80

Claims (3)

22 600 250 and swelling (green molasses) from the weight of cement. 5909 Chrompeak, used to slow down the setting together with green molasses, is produced according to GOST 220-65. The individual action of green molasses and hrompika on rast-5 thieves in strangers is ineffective. It is not recommended to use chrompeak by yourself as an outgrader. It is mainly used in mixture with PRS and hypane. Green treacle is capable of slowing the setting of oil-well portland cement to 80-90 ° C. At higher temperatures, green syrup does not slow down the seizure of portland cement. When bromine is introduced into the water and diluted with green syrup at the above concentrations, an effective slowdown in the setting of cement slurries is achieved up to 20-250 ° C. Example 1. Optimal composition for portland cement mortars at 130 ° C, weight: Portland cement 6 Chromium 0.17 Green pathocis, Water Others for dl for cf ex 6 Example 2. Optimal owl for SHPSS-120 solution at D: ShPTsS-12069 Hrompik0,22 Green syrup 0,6 Water Remaining Example 3. The optimal composition of the solution ShPTsS-200 at 180 ° C,.: ShPTsS-200 Chrompik Green Treacle Water Else Example k. The boundary composition of the temperature is 80 ° C, wt.%: Portland cement 6 Chrompik 0.05 Green syrup 0.0 Water Remaining Example 5. The boundary composition of the temperature 250 ° C, wt .: WPCS 2006.0 Chrompik 0.5 Green Treacle 2, Water Remaining Table . Figure 2 shows the timing of the test and the test results of the cement solution. Table 2 As can be seen from the table. 2, the cement stone obtained from cement slurries with additives of green molasses and chromepica (ZPH) has good bending and compression strength, which significantly exceeds GOS requirements. As the tests show, when green molasses is stored under field conditions in a closed tank, its properties maintained for 2 years. The economic efficiency of the use of green molasses with bichrophic as a retarder for cement slurry for 1 year will amount to 335 thousand rubles. The claims of the Cement slurry for cementing high-temperature oil and gas wells containing the grouting cement as the basis. Continued table. 2 Strength, kgf / cm, water and chrompeak through the day, characterized in that, in order to increase the heat resistance of the solution to a temperature of 250 ° C with a simultaneous decrease in its cost, it additionally contains green syrup - glucose production waste in the following ratio of ingredients, weight: Cement cement b7-b9 Green treacle 0 ,, Hrompik0.05-0.5 VodaEsalnoe Sources of information taken into account during the examination 1.Shadrin L.N. Technology and organization of well casing. M., Nedra, 1975, p. 122. 2. USSR Author's Certificate No. +07851, cl. С ОА В 13/2, 1971. 3. Danyushevsky B.C. and others. Reference guide for grouting materials. M., Nedra, 1973, p. 132 (prototype).