Temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and preparation method thereof

Abstract

The present invention provides a temperature resistant, non-crosslinked and biodegradable gel leak-stopping agent and a preparation method thereof. The gel leak-stopping agent of the present invention has the following advantages that: the gel leak-stopping agent has extra-wide temperature adaptability, can adapt to a temperature range of 25-180 DEG C, and can meet requirements of oil field construction; the gel leak-stopping agent has rapid dissolution rate, and forms the structure type gel with good shear thinning behavior after dissolving, wherein the structure type gel is the liquid which can be pumped and flow; the gel leak-stopping agent does not require cross-linking; the real fluid leak-stopping is realized; the construction is convenient; the product is completely dissolved in water, no precipitate and flocculent insoluble matter are generated during the whole process, no insoluble matter is generated after the product is degraded, such that the flow back is easy or the flow back is not required, the reservoir is not damaged; the product is safe and environmental protection, and is synthesized by the multi-stage initiation, such that the product conversion rate is high, the stability is good, no toxic damage is generated to the stratum, the production layer can be protected.

Description

technical field [0001] The invention relates to an engineering material, in particular to a temperature-resistant, non-crosslinking and degradable gel plugging agent and a preparation method thereof. Background technique [0002] The plugging material for drilling is an essential material in the process of drilling leakage prevention and plugging. The success rate of drilling leakage prevention and plugging directly depends on the performance of the plugging material. In my country, in the 1960s, lost circulation materials were used to deal with lost circulation, and some basic research work was carried out. In the 1970s and before, the whole period belonged to the original plugging stage. During this period, the method used to deal with the lost circulation was to block the leakage when it was seen, so as to use high-viscosity drilling fluid and bridge plugging (sawdust, mica, straw, mud balls, etc.). Bricks, etc.) materials and methods such as cement plugging are the main...

AI Technical Summary

Problems solved by technology

The disadvantage is that these materials play a temporary plugging role by accumulating at the fracture opening and consolidating particles after filtration, so it is easy to encounter resistance when running down after static plugging, and it requires a movable pipe string to run smoothly and run smoothly. Under the conditions of drilling, vibration, liquid flow and other conditions, it is easy to leak again, and the validity period is short

At the same time, this kind of plugging material is very easy to return to the wellbore from the fracture opening during the drilling process and when the pressure in the leaky zone increases, resulting in plugging failure; the plugging material existing in the wellbore cannot Degradation or incomplete degradation will cause pollution to oil production channels and oil layers in subsequent construction operations, causing serious damage

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