An acidic high-temperature fire-resistant pointing agent for petroleum industry and its construction technology

Abstract

The invention discloses an acid high-temperature fire-resistant crack sealer in the petroleum industry. The crack sealer adopts the following technical formula (w / %): 20-35 percent of Portland cement, 25-45 percent of powdery refractory cement, 5-10 percent of MgO micro powder, 5-20 percent of boric acid, 10-20 percent of chromic oxide micro powder, 10-20 percent of phosphoric acid, 5-10 percent of alumina micro powder and water in balancing amount. Since the chromic oxide micro powder is added into the crack sealer prepared by the invention, the moisture in the crack sealer can be reduced fully and the crack sealer has a better anti-cracking effect; the crack sealer has good acid resistance, good corrosion resistance and high adhesive strength; after being solidified, the crack sealer has high pressure resistance and impact resistance and is not liable to fall; the applicable temperature of the crack sealer is high and can up to about 1,700 DEG C, so that the crack sealer can be widely applied to firewalls in the petroleum industry as well as independent flues, small-sized kilns and the like in other industries.

Description

technical field [0001] The invention relates to a refractory material, in particular to an acidic high-temperature refractory pointing agent and its construction technology, belonging to the field of petrochemical industry. Background technique [0002] In the process of oil and gas exploitation, blowout operation needs to be carried out after oil testing. In order to prevent the jet flame from burning the surrounding vegetation, crops or structures, a fire wall for blowout pit must be built at the outlet of the blowout prevention pipeline. Depending on the pressure, the spraying operation time varies from a few days to dozens of days. Therefore, the firewall in the oil industry must have the pressure strength to withstand natural gas injection and be able to work under long-term high temperature conditions. Therefore, the wall built with refractory bricks is not only a fire-proof and heat-insulating structure, but also a load-bearing structure. [0003] The state stipulate...

AI Technical Summary

Problems solved by technology

[0004] In the prior art, Chinese patent CN201210502740 provides a Portland cement mortar. After the wall is built with the mortar described in this invention, the strength after curing for 28 days under standard conditions and the strength after high-temperature calcination can reach 7.5 Mpa, but the internal strength of the firewall is uneven after high-temperature calcination. The mortar facing the fire is directly sprayed by the high-temperature flame, 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 sintered The strength is increased, which seriously affects the stability and safety of the firewall; in order to improve the stability of the firewall and reduce the strength loss of the fire-facing surface after calcination, in view of this, Chinese patent CN201310671273 provides a fire-resistant pointing material, which is applied Form a protective layer on the fire-facing surface of the firewall, reduce the strength loss of the fire-facing surface of the mortar, and avoid quality hazards caused by the reduced strength of the fire-facing surface

However, the blowout prevention firewall in the petroleum industry must withstand the erosion of acid gas under the instantaneous high-intensity natural gas injection pressure. After being used under long-term high temperature conditions, the mortar joints of the wall will still crack and fall off due to acid corrosion. If it is not repaired in time Maintenance will cause great safety hazards