High-temperature-resistant plugging agent for drilling fluid and preparation method thereof

Abstract

The invention relates to a high-temperature-resistant plugging agent for a drilling fluid and a preparation method thereof. The high-temperature-resistant plugging agent is prepared from the following components by weight: 10 to 20 parts of a mineral fiber material, 10 to 30 parts of an asphalt particle, 20 to 30 parts of an inorganic elastic particle, 5 to 20 parts of fine rubber powder, 20 to 30 parts of ultrafine calcium carbonate and 0 to 5 parts of brown coal resin. The invention has the following beneficial effects: the plugging agent exerts a substantial plugging effect on holes and cracks and can form a plugging layer at a place near a borehole wall around a borehole in a short time, so invasion of solid particles and a filtrate is prevented, and borehole wall stabilizing and reservoir stratum protecting effects are exerted; and materials for preparation of the plugging agent are widely available, and the plugging agent has stable performance and adaptability to temperature, is environment friendly and can withstand a high temperature of 180 DEG C.

Description

Technical field [0001] The invention relates to an oilfield drilling plugging agent and a preparation method thereof, in particular to a high temperature resistant plugging agent for drilling fluid and a preparation method thereof. Background technique [0002] Well collapse, lost circulation and oil and gas layer protection are technical problems that restrict the smooth progress of drilling projects. For formations with well-developed bedding and fissures, in order to prevent the formation from collapsing and leakage, and to reduce damage to the oil and gas layer, the drilling fluid is required to have strong plugging properties to effectively seal the formation and fissures and prevent the drilling fluid and its filtrate from entering the formation. , To achieve the purpose of improving the pressure bearing capacity of the formation, stabilizing the well wall, preventing lost circulation, and protecting the oil and gas reservoir. [0003] Existing water-based drilling fluid sup...

AI Technical Summary

Problems solved by technology

[0003] The existing water-based drilling fluid suppression and plugging technology and materials are insufficient in field practice. The drilling fluid’s plugging ability is not enough during use, causing the well wall to collapse and block, causing a series of complicated problems

The fluid loss of oil-based drilling fluid is small, and the filtrate is oil phase, although it will not cause hydration expansion of the formation, and has little damage to the formation, but the price of oil-based base fluid is expensive, and the loss of oil phase will increase the drilling cost, so Improving the plugging ability of oil-based drilling fluid is of great significance to the smooth progress of drilling engineering and cost control

[0004] Chinese patent CN103013478 discloses a plugging material for oil-based drilling fluid and its preparation method, which adopts a synthetic preparation method, and requires drying and grinding, and the preparation method is complicated

In the sixth issue of "Drilling Fluids and Completion Fluids" published in November 2013, a document entitled "Development of Nanopolymer Plugging Agents for Oil-based Drilling Fluids" published a nanopolymer plugging agent, Its decomposition temperature is as high as 393.4 ℃, but it also needs to be synthesized, and a pre-emulsion needs to be prepared. The synthesis requires a certain temperature, stirring speed, reaction time, etc., and the synthesis process is more complicated.

[0005] Chinese patent CN103113863A discloses a preparation method of a non-permeable plugging agent, which is simple mixing. Part of the preparation materials such as calcium carbonate and wollastonite fiber are similar to this patent, but the plugging agent is used in water-based drilling fluids and does not involve Application in oil-based drilling fluid

And the above-mentioned plugging agent patent did not explain the temperature resistance of its invention

Images