Oil well cement gas expansion agent

Abstract

The invention discloses an oil well cement gas expansion agent, which consists of 30-40 parts by weight of a gas generating agent and 60-70 parts by weight of a stabilizer. The gas generating agent is a sulfohydrazide compound, and the stabilizer is at least one of silicon dioxide and calcium silicate. The oil well cement gas expansion agent can be used for daily dry blending work, and also can be used for on-the-spot wet blending work. When the oil well cement gas expansion agent acts on cement paste, the temperature reaches 35DEG C under an alkaline condition, nitrogen release starts. By means of the effect of the stabilizer in the components, small bubbles can be evenly distributed in the cement paste, and the only generated gas is nitrogen, which has no corrosion to pipes. In addition, the oil well cement gas expansion agent has good compatibility and compatibleness with other cement additives, also can effectively compensate the pressure loss and volume shrinkage when the cement paste solidifies, and prevents well cementing oil gas and water channeling.

Description

technical field [0001] The invention relates to the technical field of oil and gas well cementing engineering operations, in particular to an oil well cement gas expansion agent. Background technique [0002] The channeling of oil, water and gas in the annular space of oil and gas wells has always been a prominent problem in the oil industry at home and abroad. It has not been fundamentally solved so far, and has caused great economic losses to the oil industries of various countries. Annulus channeling after cementing and poor cement sheath cementation have always been prominent problems that affect productivity evaluation, water injection effect, and oil and gas well production. If interlayer sealing is poor, fluid from the high-pressure layer will inevitably flow into the low-pressure layer, resulting in the loss of oil and gas resources or Reservoir damage is also a huge threat to environmental protection. In recent years, various oilfields at home and abroad have adopt...

AI Technical Summary

Problems solved by technology

The gas expansion agent reacts quickly under alkaline conditions to produce a large amount of hydrogen, which is not conducive to the on-site slurry mixing construction, and hydrogen corrodes the casing, which is likely to cause hydrogen embrittlement accidents; currently, the nitrogen expansion agent mainly uses azo compounds as gas Source, through the addition of gas aids to make it react under a certain temperature of alkaline conditions to release nitrogen to produce expansion effects, can be dry mixed or wet mixed, and the on-site slurry is convenient, but the accompanying gas CO, NH 3 And some products will cause different degrees of corrosion to the pipe

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