Foam cement slurry system and composition

Abstract

The invention provides a novel chemical nitrogen-charge foam cement slurry, mainly solves the problems that the density is high and the stability is poor in a conventional chemical nitrogen-charge foam cement slurry, and is applicable to the field of oil and gas well cementing. The novel chemical nitrogen-charge foam cement slurry system comprises the components in parts by weight as follows: 100 parts of oil well cement, 0.5-2.0 parts of a foaming agent I, 0.5-2.0 parts of a foaming agent II, 0.7-2.5 parts of a foam stabilizing agent, 1.0-10 parts of a fluid loss agent, 1.0-1.5 parts of powder, 0.3-1.0 part of a retarder, 1.0-4.0 parts of an early strength agent and 48-70 parts of water. The density of the chemical nitrogen-charge foam cement slurry can be adjusted in a range of 0.80-1.50 g / cm <3>, the slurry is applicable to oil and gas well cementing operations in a range of 10-95 GEG C and has the advantages of simple site operation and foam cement cost reduction, the problems of low pressure leakiness and formation cementing leakage can be effectively solved, pollution of the cement slurry to an oil and gas production layer is reduced, and the application prospect is wide.

Description

technical field [0001] The invention relates to a chemical nitrogen-filled foam cement cementing technology, in particular to a novel chemical nitrogen-filled foam cement slurry system and its composition. Specifically, the present invention directly generates nitrogen in the cement slurry through a chemical method to prepare foam low-density cement slurry with stable performance. Background technique [0002] Foamed cement slurry is to fill the cement slurry with gas and improve the foam stability with surfactants or polymer substances, so as to prepare a stable and uniform low-density three-phase viscous fluid with low density and low permeability. Rate, low water loss, low thermal conductivity, compressibility, unique rheological properties, appropriate thixotropy and high strength, etc., can effectively solve the problems of low-pressure leaky formations, fractured formations, high permeability formations and cave formations. Well leakage, as well as solving the problem...

AI Technical Summary

Problems solved by technology

However, sodium alkyl sulfonate is easy to foam but difficult to stabilize the foam, and the foam stability is poor, so that it is impossible to prepare foam cement slurry with lower density, and the prepared foam cement stone has uneven pore structure, high permeability and resistance. low compressive strength

In addition, sodium alkylsulfonate and sodium alkylbenzenesulfonate foam stabilizers have poor biodegradability and will cause serious pollution to the environment

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