Well-cementation working fluid system prepared from waste drilling fluid and drill cuttings

Abstract

The invention discloses a well-cementation working fluid system prepared from waste drilling fluid and drill cuttings. The well-cementation working fluid system prepared from the waste drilling fluid and drill cuttings is prepared from the following components in parts by weight: 100 parts of the waste drilling fluid, 10 to 100 parts of the waste drill cuttings, 30 to 100 parts of curing agent, 0.5 to 5 parts of activating agent, 0.5 to 5 parts of activation accessory ingredient, 0.1 to 3 parts of antipollution agent and 0.1 to 3 parts of diluting agent, wherein the curing agent is formed by compounding slag and sepiolite in a mass ratio of 50 to 2; the activating agent is sodium hydroxide or potassium hydroxide; the activation accessory ingredient is one or a mixture of sodium metasilicate nonahydrate, sodium carbonate and calcium carbonate; the antipollution agent is one or a mixture of sodium salicylate, potassium citrate and sodium pentaborate; the diluting agent is one or a mixture of sodium lignin sulfonate, calcium lignosulphonate and hydroxyethyl cellulose. The well-cementation working fluid system prepared from the waste drilling fluid and drill cuttings is reliable in principle and low in cost, is environment-friendly and is convenient in field application; a resource is saved; the well-cementation working fluid system is particularly applied to cementing operation of an oil gas well with low abundance, low pressure and low permeability on a leaky block.

Description

technical field [0001] The invention relates to a cementing working fluid system prepared from waste drilling fluid and cuttings and a supporting reinjection technology, which is especially suitable for oil and gas wells in low-abundance, low-pressure, low-permeability, and leakage-prone areas that require a full range of ultra-long open-hole sections. Sealed cementing operations. Background technique [0002] With the proposal of the National Thirteenth Five-Year Oil and Gas Strategic Plan, natural gas resources have become one of the important forms of energy for my country's national economic and social development, featuring high efficiency, environmental protection, and cleanliness, and will be the preferred clean energy for future air pollution control in my country. On the one hand, the vigorous development of shale gas resources in the world has made shale gas an economical and practical clean energy, which poses an industry challenge of "reducing costs and increasin...

AI Technical Summary

Problems solved by technology

This method solves the problem of cuttings disposal to a certain extent, but due to the high cost of excavating reinjection wells and the fact that the reinjection liquid does not have the property of being solidified, the reinjection liquid has a great impact on the plugging of the formation and the improvement of the pressure bearing capacity of the formation. The function is very limited, and it cannot be used as a cementing working fluid

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