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High-temperature resistant polymer fluid loss agent for drilling fluid and preparation method thereof

A fluid loss reducing agent and high temperature resistance technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of large dosage, many types of treatment agents, poor temperature resistance, physical and chemical effects, etc.

Inactive Publication Date: 2011-11-09
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the maintenance treatment of deep and ultra-deep well drilling fluids, there are many types and large amounts of treatment agents added, which makes complex physical and chemical interactions between components with poor temperature resistance in drilling fluids under high temperature and high pressure conditions. effect, affecting the performance and stability of the drilling fluid system

Method used

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  • High-temperature resistant polymer fluid loss agent for drilling fluid and preparation method thereof
  • High-temperature resistant polymer fluid loss agent for drilling fluid and preparation method thereof
  • High-temperature resistant polymer fluid loss agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: In a four-neck flask equipped with a stirrer, reflux condenser, thermometer and heating device, add 200mL of distilled water, add N, N-diethylacrylamide 16.3g, 2-methyl-2 - 21.07g of acrylamidopropanesulfonic acid, 7.6g of N-vinylpyrrolidone and 15.7g of dimethyldiallyl ammonium chloride, adjust the pH to 7.0 with sodium hydroxide, and heat to a temperature of 60°C while stirring, Add 0.04 g of potassium persulfate and react for 3 h. The viscous liquid in the reaction kettle is dried, crushed and passed through a 20-mesh sample sieve to obtain the high-temperature resistant polymer fluid loss reducer. In this polymer, a:b:c:d=6:5:3:2, the viscosity-average molecular weight of the polymer is about 850,000, and the number of structural units is about 1400.

Embodiment 2

[0022] Example 2: In a four-neck flask equipped with a stirrer, reflux condenser, thermometer and heating device, add 200mL of distilled water, add N,N-dimethylacrylamide 15.8g, 2-methyl-2 - 21.07g of acrylamidopropanesulfonic acid, 7.6g of N-vinylpyrrolidone and 18.4g of diethyldiallylammonium chloride, adjust the pH to 7.0 with sodium hydroxide, and heat to a temperature of 60°C while stirring, Add 0.03 g of ammonium persulfate and react for 3 h. The viscous liquid in the reaction kettle is dried, crushed and passed through a 20-mesh sample sieve to obtain the high-temperature resistant polymer fluid loss reducer. In this polymer, e:b:c:f=5:3:2:1, the viscosity-average molecular weight of the polymer is about 900,000, and the number of structural units is about 1500.

Embodiment 3

[0023] Example 3: Evaluation of temperature resistance and fluid loss reduction effect

[0024] Test method: adopt GB / T 16783-1997: Field test procedure for water-based drilling fluid.

[0025] 1. Tested in fresh water base slurry

[0026] Base slurry preparation: Add 400mL tap water to a high stirring cup, add 0.8g of anhydrous sodium carbonate, 16g of secondary bentonite and 12g of evaluation soil under constant stirring, stir for 20 minutes, seal and let stand for 24 hours to prepare the base slurry.

[0027] Experimental pulp preparation and testing: Add 1% of the evaluation samples (Driscal, Example 1 sample, Example 2 sample) to the prehydrated base slurry, stir evenly at high speed, and measure the rheology and fluid loss. Put the experimental slurry into a high-temperature aging tank, heat rolling and aging at 245°C for 16 hours, and measure its rheology and fluid loss by the same method.

[0028] Table 1 Test results in freshwater base pulp

[0029]

[0030] Not...

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Abstract

The invention discloses a high-temperature resistant polymer fluid loss agent for drilling fluid and a preparation method thereof. The polymer fluid loss agent is characterized in that the polymer fluid loss agent is a copolymer generated by olefine acid, alkenyl amide, alkenyl azululanone and alkenyl quaternary ammonium through reaction, molecules of the copolymer contain 800 to 1,800 structuralunits, and viscosity average molecular weight is 500,000 to 1,200,000. The polymer fluid loss agent can resist temperature of more than 245 DEG C in the drilling liquid, has good protective colloid performance to the drilling liquid, improves the quality of a filter cake, has good fluid loss reduction effect in fresh water, aggravated fresh water, salt water and the like, can simultaneously inhibit hydration and dispersion of clay and has good rheology.

Description

Technical field: [0001] The invention belongs to fluid loss reducer for petroleum drilling fluid. technical background: [0002] With the in-depth development of oil and gas exploration and development and the increasing expansion of the drilling industry to foreign markets, the number of ultra-deep well drilling operations has increased year by year. Due to the complex strata encountered in ultra-deep well drilling, downhole high temperature and high pressure, and long operation period, higher requirements are put forward for ultra-deep well drilling fluid technology. Drilling fluids for ultra-deep wells still face technical problems such as high temperature stability (aging), rheological and fluid loss control of drilling fluids with high solid content, and narrow safe density windows for multi-set pressure series formations. [0003] At present, the temperature resistance of fluid loss control agents commonly used in domestic drilling fluids cannot meet the needs of deep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/56C08F226/10
Inventor 黄维安邱正松徐加放薛玉志李公让乔军刘宝锋赵怀珍江琳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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