Wall fixing agent modified resin polymer for drilling fluid

Abstract

The invention discloses a wall fixing agent modified resin polymer for drilling fluid. The wall fixing agent is prepared from the following raw materials: 200 to 220 parts of clear water, 20 to 30 parts of starch, 8 to 10 parts of 40% sodium hydroxide aqueous solution, 5.0 to 10.0 parts of 2-chloroethyl trimethyl ammonium chloride, 20 to 30 parts of acrylamide, 10 to 20 parts of methacryloyloxyethyl trimethyl ammonium chloride, 0.5 to 1 part of initiator, 10 to 20 parts of potassium nitrohumate, 10 to 20 parts of pseudo-boehmite, 0 to 12 parts of poly(1,3-propylidene pyridine chloride) and 20to 30 parts of adjuvant. The performance of the wall fixing agent is as follows: the water content is less than or equal to 10.0%, the low-temperature medium-pressure filtration loss is less than or equal to 10 mL, the wall fixing agent is aged for 16 h at normal temperature, high temperature of 150 DEG C and 180 DEG C, and the high-temperature high-pressure filtration loss is less than or equal to 30.0 mL. The drilling fluid can resist the high temperature of 180 DEG C or above, the filter loss is effectively reduced, the cementing force between rocks is enhanced, and the breaking strength isimproved, so that the well wall is stabilized, collapse is avoided, the safety of drilling engineering is ensured, and the drilling fluid also has the advantages of environmental friendliness and good biodegradability.

Description

technical field [0001] The invention relates to a wall-solidifying agent for drilling fluid, in particular to a resin polymer modified by the wall-solidifying agent for drilling fluid, which belongs to petroleum drilling aids. The invention also relates to a preparation method of the wall-solidifying agent-modified resin polymer for drilling fluid. Background technique [0002] In oil and gas drilling engineering, the wellbore stability problem has always been a difficult problem in the drilling industry at home and abroad, and the economic loss due to wellbore instability is huge every year. Wellbore stability is the guarantee of high-quality drilling engineering, and it is of great significance to stabilize the wellbore for soft and easily collapsed formations and shale sections. [0003] The common liquid cementing agents for drilling fluid only start from the aspect of reducing the instability of drilling fluid. Since they cannot completely inhibit the hydration expansi...

AI Technical Summary

Problems solved by technology

Although these anti-slump agents have a certain ability to inhibit shale, they are not effective in enhancing the bonding force between rocks, and some materials have certain toxicity and pollution, which cannot guarantee the quality of drilling construction and the protection of environmental resources.

[0005] The above technologies have no effect on how to make the wall cementing agent for drilling fluid resistant to high temperature, effectively reduce the fluid loss, effectively enhance the bonding force between rocks, improve the damage resistance strength, thereby stabilizing the well wall, avoiding collapse, and being environmentally friendly. give specific guidance

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