Deformable plugging block, and preparation method and application thereof

Abstract

The invention relates to a deformable plugging block, and a preparation method and application thereof, belonging to the field of plugging during petroleum drilling. The deformable plugging block comprises, by weight, 100 parts of water, 1 to 38 parts of acrylic monomers, 1 to 40 parts of acrylamide monomers, 1 to 38 parts of sulfonate monomers, 1 to 7 parts of a cross-linking agent, 1 to 13 partsof a curing agent, 0 to 19 parts of a weighting agent and 0 to 7 parts of an initiator. The deformable plugging block and the preparation method and a construction process thereof in the invention are directed at large-crack and karst-stricken complex formation leakage, particularly have good plugging effect on malignant leakage containing flowing strata and karst-bound formation water, improve plugging effect, reduce the cost of plugging construction, and guarantee the normal operation of drilling construction.

Description

technical field [0001] The invention relates to a deformable plugging block in the oil drilling plugging field, and furthermore, relates to a deformable plugging block, a preparation method and an application thereof. Background technique [0002] In the process of oil drilling, vicious leakage often occurs in broken formations, such as large cracks and caves in the formation, or fixed and flowing water in the formation, which need to be plugged to prevent leakage and ensure the safety of drilling construction. . The downhole complexity caused by severe lost circulation due to malignant lost circulation seriously affects the drilling efficiency. At the same time, in complex formations, cracks, caves, underground rivers and water flow exist alone or at the same time, and the plugging materials are easily diluted or cannot be retained. High water loss plugging technology, chemical gel plugging technology, cement slurry plugging technology and other special plugging technolog...

AI Technical Summary

Problems solved by technology

High water loss plugging technology, chemical gel plugging technology, cement slurry plugging technology and other special plugging technologies are generally used to deal with malignant well leakage. Large, plugging success rate is also relatively low, and re-leakage is prone to occur in the later drilling process; when cement-based consolidation slurry is under pressure, due to the good fluidity of the slurry, it is not easy to stay in the leakage channel, and it is difficult to achieve the ideal pressure-bearing effect

[0003] The Chinese patent with publication number CN105441046A provides a hydrogen-bonded hydrogel suitable for leak plugging of cracks and caves.

The Chinese patent with publication number CN102146280A provides a controllable expansion plugging agent. The product can control the expansion time, but the expansion rate is small, and it cannot play the role of bridging and retention in the cave, and cannot play a role in vicious leakage. good effect

The Chinese patent with the publication number CN101435317A provides a lost-return leakage cross-linked gel plugging process. Its technical solution does not involve the plugging construction process of large cracks and karst caves. There is a possibility of breaking the cross-linked gel. Unable to meet the follow-up safe drilling needs

The Chinese patent with the publication number CN101525985A provides a drilling plugging process for forming a soft plug for plugging. The plugging process of making a cement plug in the prior art is replaced by making a soft plug, which improves the construction efficiency and increases the plugging capacity. The success rate reduces the construction steps and construction cost, but the technical plan does not involve the characteristics of gel and resin soft plugs, and directly introduces the construction effect of simple plugging plugging, and does not involve the formula and proportion of plugging materials. The plugging effect has not been introduced

The plugging effect of simple soft thiophene is not obvious, and there is a risk of pipe sticking and re-leakage

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