Curable leaking stoppage spacer fluid and preparation method thereof

Abstract

The invention relates to a curable leaking stoppage spacer fluid and a preparation method thereof. The spacer fluid comprises the following components according to parts by weight: 450 parts of fresh water, 400-600 parts of curing agent, 3-10 parts of stabilizing agent, 2-20 parts of suspending agent, 10-40 parts of activating agent, 10-60 parts of activating auxiliary agent and 10-700 parts of density regulator, wherein the curing agent is slag powder; the stabilizing agent is clay; the suspending agent is sodium bentonite or calcium bentonite; the activating agent is the mixture of sodium hydroxide and sodium carbonate; the activating auxiliary agent is the mixture of sodium silicate and calcium oxide; and the density regulator can be iron ore powder for well cementation or coal ash hollow microsphere. After the curable leaking stoppage spacer fluid is cured, the lamination capability can reach more than 5MPa, the spacer fluid shows good chemical compatibility with mud and cement paste and good curing performance between 30-130 DEG C; after the spacer fluid is cured, the appearance of a formed cured body has non volume contraction; therefore, the spacer fluid can effectively pack a stratum dropping passage and provides guarantees for the follow-up operation of oil and gas wells.

Description

technical field [0001] The invention relates to a curable plugging spacer fluid used in drilling and cementing in oil and gas fields and a preparation method thereof. Background technique [0002] Lost circulation is the leakage of various working fluids (including drilling fluid, cement slurry, completion fluid and other fluids, etc.) into the ground phenomenon. Drilling fluid loss is a common downhole complication in drilling operations. Lost circulation can occur in shallow, medium and deep formations, and also in formations of different geological ages, and may occur in formations of various lithologies. Once leakage occurs during construction, it will not only delay drilling operation time, lose drilling fluid, damage oil and gas layers, interfere with geological logging work, but also may cause a series of complex situations and accidents such as well collapse, pipe sticking, blowout, and even lead to wellbore scrapping , resulting in significant economic losses. A...

AI Technical Summary

Problems solved by technology

[0003] At present, in order to solve the cementing problem of leaking wells, MTC technology is used for plugging and cementing (Wang Qingkun, Sun Linlin, Shen Cuicui. Overview of leakage prevention, plugging and cementing technology and new equipment[J]. Inner Mongolia Petrochemical , 2009, (7)), but the adjustment of the slurry density range configured by this technology is limited, and sometimes it cannot meet the requirements of plugging site construction

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