A kind of acrylamide/nanocellulose composite gel and preparation method thereof

Abstract

The invention discloses acrylamide / nano cellulose composite gel and a preparation method thereof. The preparation method comprises the following steps: adding acrylamide, an initiator and a crosslinking agent into a suspension of nano cellulose, and carrying out gelatinization to obtain the acrylamide / nano cellulose composite gel. As conventional polymer gel is of a three-dimensional hole networkstructure which takes water molecules as a main component, the gel is loose in chain structure and relatively low in intensity, has certain flowability, and cannot reach the intensity required by a gel valve applied to an oil field; particularly for a high-pressure stratum, the conventional polymer gel cannot effectively prevent overflowing of oil gas; in view of the problem, an effect of increasing the intensity of the composite gel is achieved by adding the nano cellulose into the polymer gel, so that the mechanical intensity of the gel valve is increased, and the performance of the gel valve in a sleeve is improved. According to the acrylamide / nano cellulose composite gel, the interaction between the nano cellulose and a polymer is also investigated, and the action mechanism of the nanocellulose for increasing the gel intensity is researched; the acrylamide / nano cellulose composite gel has an instruction significance on improving the mechanical property of the gel valve.

Description

technical field [0001] The invention relates to a composite gel and a preparation method thereof, in particular to an acrylamide / nanocellulose composite gel and a preparation method thereof. Background technique [0002] In order to meet the demand for oil in the world's economic development, the current focus of oil exploration and development has shifted to medium and small oil fields, oil fields with complex geological and surface conditions, unconventional oil and gas resources, and the transformation and potential tapping of oil fields in the middle and later stages. This form increases the difficulty of exploration and development, and increases the input cost. There is an urgent need for new technologies for oil and gas exploration and development. Reducing the cost of oil exploration and development is one of the important tasks in the upstream field of the petroleum industry. As far as my country is concerned, special oil and gas resources are distributed in major o...

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Problems solved by technology

Organic jelly is used to form a high-strength colloid section in the wellbore between the middle of the reservoir and the bottom of the tubing string to achieve safe isolation of the wellbore during drilling, completion and workover, and to separate mud, drilling fluid and storage Layers can be effectively separated, which can effectively prevent the killing fluid from entering the formation, and at the same time prevent the hydrogen sulfide and other gases accumulated in the formation from escaping.

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