RU1818463C - Plugging material - Google Patents

Abstract

Usage: oil and gas industry. Essence: grouting material contains, wt.%: Grouting Portland cement 90-99; furfuramide 1-10. The use of this grouting material provides an increase in the durability of the service of cement stone under conditions of hydrogen sulfide aggression by increasing its corrosion resistance and reducing its water permeability. 1 tab.

Description

hydrides and acids, as well as undergo cyclization upon interaction with sulfur in accordance with the general scheme

+ Sse-s

+ - N -3S6

 with

The third center is the CH center, which has its own specific reactions, including the ability to cyclize, and the likelihood of a carbon-nitrogen bond is not excluded.

The listed reaction centers and their properties characterize furfuramide as a very reactive compound that binds various chemicals, and sufficiently illustrate the increase in corrosion resistance of cement cement materials with its additives under conditions of aqueous hydrogen sulfide aggression.

The research data on the physicochemical properties of the grouting material for cementing wells and the resulting stone are given in the table.

For the production of grouting material, grouting Portland cement (HOMT 1581-85) and furfuramide were used.

The technology for preparing cementing material for cementing wells is no different from the preparation of conventional cementing materials.

Grouting Portland cement and furfuramide are delivered to the drilling rig, where they are mixed and mixed with water according to the conventional technology for producing grouting cement mortars without additional operations. A dry cement slurry base (Portland cement + furfuramide) can also be prepared in the factory.

Example 1 Take 0.99 kg of cement Portland cement. It kg kg of furfuramide and shut with water at a B / C basis of 0.5. The mixture is mixed on a mechanical stirrer and a cement slurry with a density of 1710 kg / m3 is obtained, Spreadability along the cone of AzNII - 230 mm, water separation - 2.3%, thickening time - 245 and 110 minutes at 22 and 75 ° C, respectively. A cement stone obtained from this composition is characterized by a tensile strength (after 48 hours) under compression of 10.6 MPa and a bending of 7.2 MPa, and after holding for 270 days in aqueous H2S (3.7 g H2S per 1 liter of water ) at 20 ° С - permeability of 4.5 x m2 with a corrosion resistance coefficient of 0.86.

Example 2. Take 0.97 kg of grouting Portland cement, 0.03 kg of furfuramide and mix with water at the rate of B / C 0.5.

The mixture is stirred on a mechanical stirrer and a cement slurry with a density of 1670 kg / m3 is obtained. AzNII cone spreadability is 215 mm, water separation is 1, 9%, thickening time is 250 and 106 minutes at 22 and 75 ° C, respectively. A cement stone obtained from the reduced composition of a cement slurry is characterized by a tensile strength (after 48 hours) at

compression of 11.3 MPa and with a bend of 8.1 MPa, and after exposure for 270 days in aqueous HaS (3.7 mg H2S per 1 liter of water) at 20 ° C - permeability of 1 x m and a coefficient of corrosion resistance of 0.96 .

5 Example 3. Take 0.9 kg of cement Portland cement, 0.1 kg of furfuramide and shut with water at the rate of B / C 0.5. The mixture is mixed on a mechanical mixer and a cement slurry with a density of 1550 kg / m3 is obtained. AzNII cone spreadability is 180 mm, water separation is 2.2%, thickening time is 270 and 130 minutes at 22 and 75 ° C, respectively. Cement stone obtained from the specified composition,

5 is characterized by a tensile strength (after 48 hours) with a compression of 10.3 MPa and a bending of 7.4 MPa, and after holding for 270 days in aqueous H2S (3.7 g J25 per 1 liter of water) at 20 ° C permeability 2 , 5 x m2 and a coefficient of corrosion resistance of 0.88.

Other formulations are prepared in a similar manner.

The tests were carried out in accordance with GOST26798.0-266798.2-85.

5 Well cementing technology for cementing wells is simple and uses non-toxic materials.

As can be seen from the table, when decreasing

With a furfuramide content of less than 1% and an increase of more than 10%, the object of the invention is not achieved.

Thus, the use of grouting material for cementing wells5 will significantly increase the durability of the service of cement stones under conditions of hydrogen sulfide aggression, and t will also significantly increase the overhaul period of wells.

Claims (1)

0 Claims Grouting material, including grouting Portland cement and an additive, characterized in that, in order to increase its corrosion resistance and 5 to reduce water permeability, it contains furfuramide as an additive in the following ratio of components, wt.%: Grouting Portland cement 90-99 Furfuramide 1-10. "The composition of the cement material was tested in sulfur-containing water at a concentration of., 5, 3.7 g / l. The grouting composition according to the prototype was tested in sulfur-arodsolera water at a concentration of II s 0, li3 g / l.