High-strength refractory cement mortar in petroleum industry and construction process thereof

Abstract

The invention discloses high-strength refractory cement mortar in a petroleum industry and a construction process thereof. The high-strength refractory cement mortar is prepared from the following technical formula (weight percentage): 10-18% of silicate cement, 8-16% of powdered refractory cement, 5% of silica powder, 12-20% of corundum, 3-6% of alumina micro powder, 5-10% of high-alumina bauxite, 1-5% of sodium nitrate, 30-50% of river sand and proper amount of water. Firewalls constructed with the refractory cement mortar have high stability and safety; the high-strength refractory cement mortar is simple in production and low in production cost; the construction process of the high-strength refractory cement mortar is simple to operate; the high-strength refractory cement mortar is applicable to high temperature of up to about 1,700 degrees centigrade and can be widely applied to the firewalls in the petroleum industry and independent chimney flues and small kilns in the other industries.

Description

technical field [0001] The invention relates to a refractory material, in particular to a high-strength refractory cement mortar and its construction technology, belonging to the field of petrochemical industry. Background technique [0002] In the process of oil and gas exploitation, blowout operation is required after oil test. In order to prevent the jet flame from burning the surrounding vegetation, crops or structures, a firewall must be built at the outlet of the blowout prevention pipeline. Because the oil test blowout operation is due to the difference in underground natural gas pressure , The spraying operation time ranges from a few days to dozens of days, so the oil industry firewall must have the pressure strength to withstand the natural gas injection, and be able to work under long-term high temperature conditions. The state stipulates that the fire resistance limit of firewalls in the construction field is 4 hours. Common building materials cannot withstand lo...

AI Technical Summary

Problems solved by technology

However, the refractory mortar has inhomogeneity in its internal strength after high-temperature calcination, and the fire-facing surface of the mortar is directly sprayed by a high-temperature flame, and the surface moisture is dried, the porosity increases, and the density decreases, resulting in a decrease in strength, while the back of the mortar is affected. Sintering increases the strength, which seriously affects the stability and safety of the firewall; in order to improve the stability of the firewall and reduce the strength loss after calcination of the fire-facing surface, CN201310671273 provides a fire-resistant pointing material, which is applied to the fire-facing surface of the firewall. Form a protective layer on the surface of the mortar, thereby reducing the loss of strength on the fire-facing surface of the mortar, and avoiding quality hazards caused by the reduction in the strength of the fire-facing surface

In this process, when constructing the fire wall for oil testing and spraying operations, refractory mortar must be used to build fire bricks to build the fire wall, and then two jointing procedures are performed, which makes the construction complicated and increases the operating cost; in addition, due to the small joint area, it can reduce Limited loss of strength on the fire side