Ground crosslinked acid liquid for acid fracturing and preparation method thereof
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A technology of cross-linking acid and ground, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problems of unstable cross-linking agent and precipitation, etc. High viscosity effect
Inactive Publication Date: 2012-06-20
中国石油化工股份有限公司西北油田分公司工程技术研究院 +1
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[0005] In order to overcome the shortcomings of existing cross-linking agents that are unstable and precipitate when placed for a long time, the present invention provides a ground cross-linking acid solution and its preparation method
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Embodiment 1
[0031] Embodiment 1: the synthesis of zirconium acetylacetonate
[0032] Dissolve 12.0g of zirconium oxychloride in 15.0g of distilled water, stir until completely dissolved, pour it into a four-necked reaction flask equipped with a reflux condensation device, raise the temperature to 50°C±1°C, then add 15.0g of acetylacetone and ethylene glycol Aldehyde 1.0g, react for 4.0h, heat up to 80°C±1°C, continue to react for 1h to obtain zirconium acetylacetonate.
Embodiment 2
[0035] Embodiment 2: ground cross-linking acid solution, by mass percentage component is as follows:
[0036] Concentrated hydrochloric acid 55.6% (equivalent to 20% of pure hydrogen chloride), thickener 1.0%, organometallic crosslinking agent 4.0%, and the rest is water.
[0037] Preparation of ground cross-linking acid solution: Add 39.4 parts of water, 55.6 parts of concentrated hydrochloric acid and 1.0 part of thickener in order by mass parts, stir evenly and add 4.0 parts of freshly prepared organometallic cross-linking agent zirconium acetylacetonate.
[0038] The cross-linking time of the ground cross-linking acid solution of the present embodiment is 4.0min (30 DEG C), after cross-linking, form a colorless transparent jelly that can be hung (see attached figure 1 ), at 140℃, 170S -1 Conditional shear 0.5h, viscosity 126mPa.s. The sedimentation velocity of quartz sand is 0.0055cm / s.
Embodiment 3
[0040] As described in Example 2, the difference is that the organometallic crosslinking agent zirconium acetylacetonate prepared in Example 1 was used after standing for 50 days. After being placed for 50 days, the zirconium acetylacetonate was clear without precipitation. The crosslinking time of the ground crosslinking acid solution was 4.1min (30°C), and a jelly that could be hung was formed after crosslinking. Performance is unchanged.
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Abstract
The invention relates to a ground crosslinked acid liquid for acid fracturing and a preparation method thereof. The ground crosslinked acid liquid comprises the following components by weight percent: 15-25% of hydrochloric acid (calculated by pure hydrogen chloride), 0.6-1.2% of EVA (ethylene-vinyl acetate)-180 thickener, 1-5% of organometallic crosslinking agent zirconium acetylacetonate and the balance water. The preparation method comprises the following steps of: adding a defined amount of thickener in a hydrochloric acid solution at the room temperature, quickly stirring to ensure that the thickener is completely dissolved, then standing for 2-4h to obtain uniform thick liquid, and finally adding the organometallic crosslinking agent to stir evenly. The crosslinking agent used in the method has good stability, precipitate can not appear after long-time standing, and the obtained ground crosslinked acid liquid can perform ground crosslinking in a strong acid environment to form gel which can be picked and hung and be used for oilfield acid fracturing.
Description
technical field [0001] The invention relates to the technical field of oil field reservoir reformation, in particular to a ground cross-linked acid liquid for acid fracturing and a preparation method thereof. Background technique [0002] Acid fracturing is the main technological measure for increasing production and injection of carbonate rock oil and gas layers. In acid fracturing construction, acid liquid or prefluid is injected into the formation at a flow rate greater than the absorption capacity of the formation to rupture the formation and form cracks. Dissolves crack walls. Because the acid solution dissolves in a non-uniform manner, the flow path can still be maintained when the fracture is closed, thereby achieving the purpose of increasing production. This technology is generally highly valued at home and abroad, and it provides a strong guarantee for the discovery of oil and gas, verification of production, stable and enhanced recovery, and economical and effici...
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