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Method for preparing waterproof and high-strength oil well plugging agent through miniemulsion method

A fine emulsion method, water-resistant technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as environmental pollution costs, reduce environmental pollution and production costs, ensure plugging strength, and plugging strength increased effect

Active Publication Date: 2015-11-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of polluting environment and high cost existing in existing oil well plugging agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] The oil well plugging agent prepared according to the preparation method of the present invention has excellent performance, and under the condition of the same dosage, it can ensure the strength of downhole plugging of fractures, and the presence of a large amount of water has little influence on its plugging strength.

[0032] The invention introduces the fluorine-containing monomer and the ketone hydrazine crosslinking system into the preparation of the water-based resin polymer to prepare the oil well plugging agent. The water-based resin polymer avoids the use of a large amount of oil or alcohol while ensuring good plugging strength, reducing environmental pollution and production costs. Under the action of oil well temperature (60-90°C), the plugging agent prepared by the present invention can solidify, and achieve the purpose of plugging fractures by wrapping rock cores, gravels, or consolidating on their surfaces, while ensuring plugging strength . The ketohydr...

Embodiment 1

[0038] According to the number of parts by mass, after dissolving 0.6 parts of ammonium persulfate in 63 parts of deionized water, place it in a reactor at 70°C, and then add emulsion A and initiator aqueous solution A dropwise therein, and keep the reaction for 0.5h. The rate of addition of emulsion A is 20 drops / minute, and the rate of addition of initiator aqueous solution A is 5 drops / minute, then add emulsion B and initiator aqueous solution B dropwise, and the rate of addition of emulsion B is 25 drops / minute, triggering The dripping rate of the aqueous solution B of the agent is 7 drops / min. After the dripping is completed, it is incubated and reacted at 75°C for 3 hours. After the reaction is completed, it is lowered to room temperature, and ammonia water is added dropwise to the reactor to adjust the pH value to 8.0, and 0.75 parts of adipic acid are added. Dihydrazide, stirred for 1.0h, filtered out to obtain oil well plugging agent; wherein, in parts by mass, emulsio...

Embodiment 2

[0041] According to the number of parts by mass, after dissolving 1.2 parts of ammonium persulfate in 81 parts of deionized water, place it in a reactor at 75°C, then add emulsion A and initiator aqueous solution A dropwise therein, and keep the reaction for 0.5h. The rate of addition of emulsion A is 20 drops / minute, and the rate of addition of initiator aqueous solution A is 5 drops / minute, then add emulsion B and initiator aqueous solution B dropwise, and the rate of addition of emulsion B is 25 drops / minute, triggering The dripping rate of the aqueous solution B of the agent is 7 drops / min. After the dripping is completed, it is incubated at 75°C for 2.5 hours. After the reaction is completed, it is lowered to room temperature, and ammonia water is added dropwise to the reactor to adjust the pH value to 7.5, and 0.75 parts of adipic acid are added. Dihydrazide, stirred for 0.5h, and filtered out to obtain an oil well plugging agent; wherein, in parts by mass, the emulsion A...

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PUM

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Abstract

The invention relates to a method for preparing a waterproof and high-strength oil well plugging agent through a miniemulsion method. The method includes: dissolving ammonium persulfate in deionized water, and then disposing the deionized water into a reactor at temperature of 70-75 DEG C; adopting modes of mechanical stirring and ultrasonic treating to introduce a ketone-hydrazide crosslinking system and a fluorine-containing monomer into an emulsion; preparing a plugging agent through a miniemulsion polymerizing method, dropwise adding the emulsion and initiator water solution for thermal reaction for 2h, cooling, using ammonia water to adjust pH to 7.5-8.5, adding a certain amount of adipic dihydrazide, stirring and discharging to obtain the oil well plugging agent. The oil well plugging agent is prepared by adopting a mode of miniemulsion polymerizing, so that under the condition of same consumption, strength of downhole crack plugging can be ensured, and existence of a lot of water exerts small influence on plugging strength of the oil well plugging agent.

Description

technical field [0001] The invention relates to a preparation method of an oil well plugging agent, in particular to a method for preparing a water-resistant high-strength oil well plugging agent by a fine emulsion method. Background technique [0002] When producing oil in an oil field, it is necessary to fracture the formation or rock formation to facilitate the seepage of oil. In the construction process of deep oil recovery, oil wells need to be refractured. With the prolongation of oilfield development time, the fractures in the early stage of fracturing are not conducive to oil extraction. In order to increase the daily oil increment of a single well, considering the characteristics of obvious development of natural micro-fractures in low-permeability reservoirs and the small difference in principal stress between the two directions, it is necessary to carry out the process of fracture temporary plugging and repeated fracturing. , artificially add fracture temporary ...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F220/22C08F220/32C08F220/58C08F2/30C08F2/26C09K8/512
Inventor 何衡慕立俊赵振峰李宪文陆红军卜向前吕宝强齐银康博常笃李建辉庞鹏
Owner PETROCHINA CO LTD
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