Multifunctional low-density curing working solution system

Abstract

The invention discloses a multifunctional low-density curing working solution system which is prepared from the following components in parts by mass: 100 parts of waste drilling fluid, 30-70 parts ofa curing agent I, 10 parts of a curing agent II, 1-5 parts of a flexibilizer, 1-6 parts of an activating agent, 0.5-5 parts of a strength enhancer, 0.1-3 parts of an anti-pollution agent, 0.1-3 partsof diluent and 0.1-3 parts of a suspension stabilizer, wherein the curing agent I is blast furnace slag; the curing agent II is pumice powder; the flexibilizer is a mixture of modified basalt fibersand rubber latex; the activating agent is sodium hydroxide or potassium hydroxide; and the strength enhancer is sodium metasilicate nonahydrate, calcium sulfate, sodium carbonate or a mixture thereof.The multifunctional low-density curing working solution system disclosed by the invention has the characteristics of low temperature early strength, low elasticity modulus, high cementing between twointerfaces, excellent plugging effect and the like, is low in cost, environment-friendly and convenient in site construction and has wide market application prospects.

Description

technical field [0001] The invention relates to a multifunctional low-density solidified working fluid system, which belongs to the field of petrochemical industry. technical background [0002] In recent years, sustained and rapid economic growth and extensive development methods have made China's oil and gas energy shortages and environmental degradation more and more serious, especially the environmental hazards of waste drilling fluids have not been resolved. With the awareness of environmental protection in my country The problem of disposal of waste drilling fluid needs to be solved urgently. On the other hand, with the development and depletion of oil and gas energy, oil exploration and development continue to expand to complex and deep oil and gas reservoirs, and the difficulty of cementing is also increasing, especially for complex formations, In low-pressure leaky formations and long sealing sections, single-function cementing fluids can no longer meet the requirem...

AI Technical Summary

Problems solved by technology

However, the traditional MTC technology has defects such as high brittleness, poor deformation ability, low low-temperature strength, and poor compatibility with cement slurry, making it unable to adapt to complex oil and gas wells.

[0004] Although the slag MTC cementing fluid disclosed in the invention patent "Slag MTC Cementing Fluid and Its Preparation Method" (CN103627375A) solves the problem of low compressive strength under low temperature conditions and makes it suitable for shallow wells and low temperature formations, it does not consider Chemical pollution of cementing fluid and cement slurry

[0005] The invention patent "a curable plugging spacer and its preparation method" (CN101857799A) discloses a curable plugging spacer. Although it has the functions of spacer and stoppage, it needs to prepare a base liquid in advance. The on-site process is relatively complicated, and it cannot solve the problem of environmental pollution caused by waste drilling fluid on site

[0006] The invention patent "a cementing working fluid system prepared from waste drilling fluid and cuttings" (CN105925254A) uses the water absorption and slow release of sepiolite to solve the problem of high temperature cracking of MTC solidified body, but it only considers the solidified body caused by high temperature Cracking is far from enough, and the problem of cracking has not been considered from the aspects of high brittleness and high modulus of elasticity of the solidified body itself, and the effect of only physical slow release of sepiolite is also very limited

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