Plugging and water plugging system and preparation method thereof

A water system and hydraulic technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of poor retention, long thickening time, insoluble, etc., and achieve the effect of high strength

Pending Publication Date: 2022-08-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For example, the cement system-based water plugging and leakage plugging agent provided by the related technology has the disadvantages of long thickening time and insolvability after misplugging, and, for reservoirs with serious leakage, its retention and poor adaptability

Method used

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  • Plugging and water plugging system and preparation method thereof

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preparation example Construction

[0058] On the other hand, the embodiment of the present invention also provides the preparation method of any of the above-mentioned leakage and water plugging systems, and the preparation method of the leakage and water plugging system comprises the following steps:

[0059] Step 1. According to the mass parts of each component, put α-type hemihydrate gypsum, wetting material and oil in a reaction kettle and stir evenly.

[0060] Step 2: Raise the temperature inside the reaction kettle to the first set temperature, add surfactant to the reaction kettle while stirring, and stir evenly.

[0061] Step 3, cooling the internal temperature of the reaction kettle to the second set temperature, adding reinforcing material and hydraulic material to the reaction kettle, and stirring evenly to obtain a leakage and water blocking system.

[0062] Through the above preparation method, the different components are added in sequence in the above order, and a system for plugging leaks and wa...

Embodiment 1

[0080] The present embodiment 1 provides a system for plugging leaks and water, and the system for plugging leaks and water includes the following components by weight: 100 parts by weight of α-type hemihydrate gypsum;

[0081] 130 parts by weight of No. 3 white oil;

[0082] 40 parts by weight of Portland oil well cement;

[0083] 0.5 parts by weight of polyoxyethylene sorbitan monostearate;

[0084] 0.5 parts by weight of polypropylene fibers;

[0085] 2 parts by weight of modified asphalt powder.

[0086] The plugging and water blocking system is prepared by the following method: pour the designed amount of α-type hemihydrate gypsum, modified asphalt powder and No. 3 white oil into a 1000L enamel reaction kettle, open and stir until the above-mentioned α-type hemihydrate gypsum and Portland oil well cement dissolves uniformly in oil.

[0087] Heating was carried out to make the internal temperature of the enamel reaction kettle rise to 35°C, and the designed amount of p...

Embodiment 2

[0092] This embodiment 2 provides a system for plugging leaks and water, and the system for plugging leaks and water includes the following components by weight: 100 parts by weight of α-type hemihydrate gypsum;

[0093] 140 parts by weight of No. 5 white oil;

[0094] 50 parts by weight of Portland oil well cement;

[0095] 0.7 parts by weight of polyoxyethylene sorbitan monostearate;

[0096] 1 part by weight of polyester fiber;

[0097] 4 parts by weight of modified asphalt powder

[0098] The leak and water plugging system is prepared by the following method: pour the designed amount of α-type hemihydrate gypsum, modified asphalt powder and No. 5 white oil into a 1000L enamel reaction kettle, open and stir until the above-mentioned α-type hemihydrate gypsum and Portland oil well cement dissolves uniformly in oil.

[0099] Heating was carried out to make the internal temperature of the enamel reaction kettle rise to 33 ° C, and the designed amount of polyoxyethylene sor...

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Abstract

The invention discloses a plugging and water plugging system and a preparation method thereof, and belongs to the field of petrochemical industry. The plugging and water plugging system comprises the following components in parts by weight: 100 parts of alpha-type semi-hydrated gypsum; 120 parts by weight to 250 parts by weight of oil; 15 to 60 parts by weight of a hydraulic hard material; 0.2 to 1 part by weight of a surfactant; 0.3 to 1.5 parts by weight of a reinforcing material; and 1-5 parts by weight of a wetting material. The plugging and water plugging system has the advantages of oil-water phase selectivity, flash solidification, high strength, dissolvability after plugging and the like. After the alpha-type semi-hydrated gypsum is injected into a water outlet layer, the alpha-type semi-hydrated gypsum adsorbs water to generate an oil-water replacement effect, wettability is reversed, an oil film adsorbed on the surfaces of particles in the plugging and water plugging system is replaced, the particles are separated out from an oil phase, absorb water and are hydrated, and the particles are deposited at the throat of a crack until the particles are rapidly condensed, solidified and accumulated, and the rapid plugging effect is achieved.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a system for plugging leaks and water and a preparation method thereof. Background technique [0002] As oilfield exploration and development gradually drill into complex formations, drilling leakage and formation water production are becoming more and more common. For example, there are more and more cases of drilling into high permeability layers, fractures and even caves. Serious reservoir leakage is a serious problem in the drilling process. It has the characteristics of large leakage and secondary leakage. If the leakage cannot be effectively controlled in time, the drilling fluid will be transmitted in the pores and fractures and extend to the depths of the reservoir. Vicious leakage is formed, and the working fluid is in and out, resulting in huge losses. In addition, as the oilfield enters the late stage of high water-cut production, the heterogeneity of the reservo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/502
CPCC09K8/502
Inventor 闫海俊谢刚余吉良张黎黎刘莎莎史磊井继哲魏爱军秦忠海郝惠军
Owner PETROCHINA CO LTD
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