Water loss reducing composition, cement composition containing water loss reducing composition, and preparation method and use of water loss reducing composition

A technology of fluid loss reducer and composition, which is applied in drilling compositions, chemical instruments and methods, earth square drilling, etc., and can solve problems such as poor salt resistance of polyvinyl alcohol fluid loss reducers

Active Publication Date: 2012-11-21
CHINA UNITED COALBED METHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patents ZL 011309792, ZL 2005101190057 and ZL 200510119070X disclose the composition and preparation method of polyvinyl alcohol fluid loss reducers, but these methods still do not change the deficiency of poor salt resistance of polyvinyl alcohol fluid loss reducers
However, there is no report on the preparation of fluid loss reducer by copolymerization of N-vinylpyrrolidone and acrylamide at present.

Method used

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  • Water loss reducing composition, cement composition containing water loss reducing composition, and preparation method and use of water loss reducing composition
  • Water loss reducing composition, cement composition containing water loss reducing composition, and preparation method and use of water loss reducing composition
  • Water loss reducing composition, cement composition containing water loss reducing composition, and preparation method and use of water loss reducing composition

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preparation example Construction

[0063] In the method for preparing the fluid loss reducer composition of the present invention, there is no specific limitation on the temperature and mixing time for mixing the components, as long as the mixing conditions used allow the components to be mixed uniformly.

[0064] Preferably, in the embodiment of preparing the fluid loss reducer composition, the mixing can be carried out at a temperature ranging from normal temperature to 60° C. for 10 to 30 minutes. In another embodiment of preparing the fluid loss reducer composition, the mixing is carried out at 40-60° C. for 10-30 minutes. Without being limited by theory, it is believed that the method for preparing the fluid loss reducing agent composition of the present invention is carried out under such conditions, which is conducive to making N-vinylpyrrolidone-acrylamide The complexation between the copolymer and the organic amine early strength agent containing active hydrogen atoms such as hydroxyl groups and the su...

Embodiment 1

[0083] Example 1. Preparation of N-vinylpyrrolidone-acrylamide copolymer

[0084] Add 5 parts by weight of N-vinylpyrrolidone, 1.2 parts by weight of acrylamide and 85 parts by weight of deionized water into a reactor equipped with a stirrer and a thermometer to stir. The reaction temperature is controlled at 60 ° C. After nitrogen gas is passed for 15 minutes, 0.20 Parts by weight of potassium persulfate initiator, the polymerization reaction was carried out for 120 minutes, and the N-vinylpyrrolidone-acrylamide copolymer with a weight-average molecular weight Mw of 300,000 was obtained. The measurement method of the molecular weight was a light scattering method, and the infrared Spectral graph such as figure 1 shown in . Through carbon nuclear magnetic resonance spectrum and hydrogen spectrum analysis, it is determined that the proportion of structural units in the synthesized polymer is consistent with the proportion of monomers in the reactants.

[0085] figure 1 The i...

Embodiment 2

[0086] Example 2. Preparation of fluid loss reducer composition A1

[0087] The N-vinylpyrrolidone-acrylamide copolymer (NVP-AM) prepared in Example 1, the sulfonated formaldehyde acetone polycondensate and triethanolamine were mixed under ambient conditions in a weight percentage of 65.5:33.0:1.5 to obtain a liquid The fluid loss reducer composition A1.

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Abstract

The invention relates to a water loss reducing composition, a cement composition containing the water loss reducing composition, and a preparation method and a use of the water loss reducing composition. The water loss reducing composition comprises 55-75 parts by weight of an N-vinyl pyrrolidone-acrylamide copolymer, 28-45 parts by weight of a sulfonated formaldehyde-acetone polycondensate, and 0.7-2.0 parts by weight of an organic amine early strength agent, wherein the N-vinyl pyrrolidone-acrylamide copolymer is prepared through a polymerization reaction of N-vinyl pyrrolidone and acrylamide with the weight ratio of the N-vinyl pyrrolidone to the acrylamide of 1:0.12-1:0.4, and preferably 1:0.2-1:0.3.

Description

technical field [0001] The invention relates to a fluid loss reducer composition, a cement composition containing it, a preparation method thereof, and an application in the fields of oil field chemistry and oil and gas well cementing. The water loss reducing agent composition of the invention can be used for reducing the water loss of cement slurry in the cementing process of oil, natural gas and coal bed gas, and is especially suitable for the cementing of coal bed gas wells. Background technique [0002] The main component of coalbed methane is methane, the calorific value can reach 8000 kcal, and the product after combustion is mainly CO 2 and H 2 O is a new type of energy that is cleaner, more efficient and safer. The total reserves of coalbed methane in my country within the range of burial depth of 300-2000m reach 31.46 trillion m 3 , ranking third in the world after Russia and Canada. Coal bed methane is an important realistic alternative energy in my country, an...

Claims

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Application Information

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IPC IPC(8): C09K8/487C04B28/04C04B24/30E21B33/13C08F226/10C08F220/56
Inventor 孙建平王成文孙晗森王瑞和周卫东
Owner CHINA UNITED COALBED METHANE
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