Preparation method of horizontal well plugging agent

A technology for horizontal wells and plugging agents, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor temperature and salt resistance, short validity period, etc., and achieve poor permeability, long validity period, good water resistance and The effect of oil resistance

Active Publication Date: 2019-12-31
四川瑞冬科技有限公司
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Problems solved by technology

The disadvantage is that the validity period is short, the ability to resist temperature and salt is poor, and it is not suitable for use in high-temperature and high-salt formations

Method used

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  • Preparation method of horizontal well plugging agent
  • Preparation method of horizontal well plugging agent
  • Preparation method of horizontal well plugging agent

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Embodiment

[0050] A preparation method of horizontal well plugging agent, comprising the following steps:

[0051] A. Take 200g of montmorillonite, place it in 800mL of dilute hydrochloric acid with a mass fraction of 7.5%, stir and make slurry for 12h, after suction filtration and distillation of hydrochloric acid, wash repeatedly with distilled water until the pH is 7.0, put the treated montmorillonite in Dry at 100°C for two days and reserve;

[0052] B. Take 20g of dried montmorillonite in step A, uniformly disperse it in 400mL of deionized water at a stirring speed of 300 rpm, age for 24h, heat up to 65°C, add 6.56g of hexadecyltrimethyl bromide Ammonium chloride, stirred at a high speed of 300rpm for 1.5h; cooled to 25°C, filtered under reduced pressure, washed with pure water, until silver nitrate was added to the filtrate without precipitation, dried in vacuum at 80°C for 12h, ground, crushed and sieved , the sieve mesh number is 325 orders, makes modified montmorillonite (O-MMT...

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Abstract

The invention belongs to the technical field of development of horizontal wells, and particularly relates to a preparation method of a horizontal well plugging agent. The preparation method comprisesthe steps: modifying montmorillonite so as to expand interlayer spacings, then distributing urea-formaldehyde resin among layers of the modified montmorillonite, adding a complexing agent finally, andperforming curing so as to obtain the horizontal well plugging agent. The horizontal well plugging agent has a dense structure, high strength and few pores, the permeability of the plugging agent ispoor, and a better plugging effect is achieved; and meanwhile, the plugging agent has good water resistance and oil resistance, a wellbore of a horizontal well can be plugged by the plugging agent, and a long period of validity is achieved.

Description

technical field [0001] The invention belongs to the technical field of horizontal well development, in particular to a preparation method of a horizontal well plugging agent. Background technique [0002] Horizontal well development technology, as an important technology in the development of complex reservoirs, is now widely used in major oilfields at home and abroad. Production practice shows that horizontal wells can tap potential in mature areas, produce marginal reserves, develop thin layers, bottom water reservoirs and The vertical well ratio has obvious advantages and provides strong technical support for the efficient development of the block. Although horizontal well development has many advantages, it also has many disadvantages. Its biggest disadvantage is that the horizontal well whose wellbore is parallel to the oil reservoir is easy to produce water during production, resulting in a sharp drop in oil production, a sharp increase in the water content in the pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/504C09K8/508
CPCC09K8/5045C09K8/5086
Inventor 赖南君陈庆源乔东宇唐雷郑学成韩利娟袁琳郝丹
Owner 四川瑞冬科技有限公司
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