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A polysaccharide polymer, hydrogel technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of small applicable temperature range and pollute the environment, and achieve the effect of wide temperature applicable range
Inactive Publication Date: 2016-07-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
The water plugging gel can overcome the problems of the existing water plugging gel, such as the small applicable temperature
Method used
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Embodiment 1
[0035] According to the polysaccharide main agent chitosan 5%, the crosslinking agent (N, N-methylenebisacrylamide) 2%, the cosolvent (acetic acid) 3%, the concentration range of the gelation regulator (sodium chloride) is 0 ~10%, the rest is water components to configure the water blocking gel system and put into the oven. The experimental temperature is 130°C, and the gelation time is between 6 and 12 hours. The gelation conditions are shown in Table 2. As shown in Table 2, the final setting strength can reach grade I, and no syneresis occurs in 90 days.
[0036] Table 2 embodiment 1 gelation situation
[0037] Gelling Regulator Concentration (%)
Embodiment 2
[0039] According to the variation range of polysaccharide main agent chitosan concentration is 2.5~5%, cross-linking agent (polyethylene glycol (600) diacrylate 1.5%, N, N-methylenebisacrylamide 0.5%) 2%, auxiliary The solvent (hydrochloric acid) is 1%, the gel-forming regulator (sodium chloride) is 3%, and the remaining components are water to configure a water-blocking gel system and put it into an oven. The experimental temperature is 35°C, and the gelation time is between 20 and 72 hours. The gelation conditions are shown in Table 3. As shown in Table 3, the final setting strength can reach grade I, and no syneresis occurs in 90 days.
[0040] Table 3 embodiment 2 gelation situation
[0041] Concentration of polysaccharide main agent (%)
Embodiment 3
[0043] According to the polysaccharide main agent chitosan 3%, the crosslinking agent (N, N-methylene bisacrylamide) concentration variation range is 1-2%, cosolvent (acetic acid) 2%, gelation regulator (sodium chloride ) is 10%, and the rest is water components configured into a water-blocking gel system and put into an oven. The experimental temperature was 130°C, and the gelation time was between 20 and 32 hours. The gelation conditions are shown in Table 4. As shown in Table 4, the final setting strength can reach grade I, and no syneresis occurred in 90 days.
[0044] Table 4 embodiment 3 gelation situation
[0045] Cross-linking agent concentration (%)
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Abstract
The invention discloses polysaccharide polymer water plugging gel which is prepared from the following ingredients by mass: 2.5 to 5 percent of a main polysaccharide agent, 1 to 2 percent of a cross-linking agent, 1 to 3 percent of a cosolvent, 0 to 10 percent of a gelatinizing regulator, and the balance of water, and is prepared according to the following steps: preparing a water plugging gel system according to the proportion; sealing the water plugging gel system; putting the water plugging gel system into a 35 to 130 DEG C oven for gelatinizing; controlling the gelatinizing time to be 6 to 72 hours according to different concentrations of the ingredients and different mineralization degrees of an aqueous solution; judging the gelatinizing time according to a visual inspection coding method, that is, gelatinizing is stopped when final set strength reaches rigid gelatinizing I level, and dehydration shrinking does not happens in 90 days after the water plugging gel system is gelatinized. According to the invention, the gel system is wide in temperature application range, and can be used for not only high-temperature reservoir water plugging operation, but also low-temperature reservoir water plugging operation; the final set strength can reach visual estimation code I level; the long-time stability is excellent; the gel system is biodegradable.
Description
technical field [0001] The invention relates to a water blocking gel used for enhancing oil recovery, in particular to a polysaccharide polymer water blocking gel, which belongs to the field of oil field chemistry. Background technique [0002] The chemical profile control and water shutoff technology is a relatively mature technology in oilfields for "controlling water to stabilize oil production" and "controlling water to increase oil production", which can effectively improve the sweep coefficient of injected water and achieve the purpose of improving oil recovery. Among chemical profile control water shutoff agents, organic gel water shutoff agents have the advantages of strong plugging ability and selective water shutoff, and are widely used in profile control and water shutoff operations. The most commonly used and effective organic water plugging gel system in oilfields is the polyacrylamide gel system, which is mainly composed of polyacrylamide polymers and different...
Claims
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Application Information
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