Oil-based stuck freeing agent composition for drilling fluid and preparation method for oil-based stuck freeing agent composition

Abstract

The invention provides an oil-bases stuck freeing agent composition for drilling fluid and a preparation method for the oil-based stuck freeing agent composition. The composition contains span-80 or span-60, span-20 or span-40, alkyl benzene sulfonic acid, petroleum acid, poly acid and mineral oil. The preparation method includes pumping raw material components into a reaction kettle, stirring, heating to 65 DEG C-95 DEG C, heat-preserving, stirring for reacting for 120-180 minutes, cooling to the room temperature and discharging for packaging. A using method of the stuck freeing agent includes determining density of stuck freeing spotting fluid according to safe density of the drilling fluid needed on the spot, stirring water, diesel, kerosene, or other mineral oil and the stuck freeing agent, adding barite and stirring to form stuck freeing spotting fluid emulsion, pumping the formed emulsion into a sticking section for soaking to unfreeze, and continuously pumping into the stuck freeing spotting fluid at a speed of 0.16-0.36M3/h at the soaking stage until the sticking is released. The oil-based stuck freeing agent composition for the drilling fluid is convenient to use on the spot, small in using amount, convenient to conventionally carry for drilling crew, the maximum using amount is 8.7% of the stuck freeing spotting fluid, fluctuation range of stuck freeing time is narrow, the stuck freeing time of the stuck freeing spotting fluid with a density of 2.28g.cm<-3> ranges from 80 minutes to 160 minutes.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, in particular to an oil-based jam-releasing agent composition for drilling fluid and a preparation method. Background technique [0002] Adhesion sticking and differential pressure sticking are common accidents in the oil drilling process. Such accidents may lead to the scrapping of the wellbore and cause economic losses ranging from nearly one million to tens of millions for the operating company. One of the methods to solve sticking pipe sticking and differential pressure pipe sticking is to use the jamming solution prepared by the jamming release agent to soak and unjamming. There are two types of anti-jamming agents: oil-based and water-based. Oil-based anti-jamming agents can avoid water-sensitive changes in formations. They are safer and more effective than water-based anti-jamming agents, and are generally trusted by operators. [0003] There are following deficiencies in the d...

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Problems solved by technology

[0005] Long unblocking time: The deposition of oil-dispersed solid-phase colloidal particles such as organic soil and asphalt hinders the penetration of the unblocking agent and diesel oil to the bonding interface between the drilling tool and the well wall, prolonging the unblocking time, and the actual application effect is better than the indoor results It will be worse, and the success rate of solving the card is very low in field application

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