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High temperature and salt resistant polymer fluid loss additive for drilling fluid and preparation method of high temperature and salt resistant polymer fluid loss additive

A technology of fluid loss control agent and high temperature resistance, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of uncommon fluid loss control agents, and achieve ideal high temperature and salt resistance performance, good quality, and oxidation resistance The effect of low degree of hydrolysis

Inactive Publication Date: 2013-11-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many types of fluid loss control agents at present, it is not common to have fluid loss control agents that are resistant to high temperature and compound brine

Method used

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  • High temperature and salt resistant polymer fluid loss additive for drilling fluid and preparation method of high temperature and salt resistant polymer fluid loss additive
  • High temperature and salt resistant polymer fluid loss additive for drilling fluid and preparation method of high temperature and salt resistant polymer fluid loss additive
  • High temperature and salt resistant polymer fluid loss additive for drilling fluid and preparation method of high temperature and salt resistant polymer fluid loss additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 Synthesis of fluid loss control agent TSC-1:

[0024] 20.7 g of 2-acrylamide-2 methylpropanesulfonic acid (AMPS) was dissolved in deionized water, and the solution was neutralized to pH=7-8 with about 4 g of NaOH. Mix 21.3g of acrylamide (AM), 8.3g of N-vinylpyrrolidone (NVP), 5.2g of sodium p-styrene sulfonate (SSS) with the neutralized AMPS solution, and add it to a four-necked flask with a thermometer and a reflux device Medium, stirring, passing nitrogen and deoxygenating. The reaction temperature was set at 45°C. After passing nitrogen for 30 minutes, 0.2% initiator was added, and the total monomer concentration was 20%. After reacting for 8 hours, the jelly was dried and pulverized to obtain the product TSC-1 with a yield of 91.7%. Its reaction formula is as follows:

[0025]

Embodiment 2

[0026] Example 2 Synthesis of fluid loss reducer TSC-2:

[0027] 20.7 g of 2-acrylamide-2 methylpropanesulfonic acid (AMPS) was dissolved in deionized water, and the solution was neutralized to pH=7-8 with about 4 g of NaOH. Mix 24.8g of N-vinyl-N-methylacetamide (VMA), 8.3g of N-vinylpyrrolidone (NVP), 15.5g of sodium vinylbenzene sulfonate (SSS) with the neutralized AMPS solution, add In a four-necked flask equipped with a thermometer and a reflux device, stir, pass nitrogen and exhaust oxygen. The reaction temperature was set at 60°C. After passing nitrogen for 30 minutes, 0.3% initiator was added, and the total monomer concentration was 20%. After reacting for 10 hours, the jelly was dried and pulverized to obtain the product TSC-2 with a yield of 90.1%. Its reaction formula is as follows:

[0028]

[0029] 2. Structural characterization of fluid loss control agent TSC

[0030] see figure 1 , figure 1 It is the infrared spectrogram of TSC-1, and the characteristic...

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Abstract

The invention relates to a high temperature and salt resistant polymer fluid loss additive for a drilling fluid and a preparing method of the high temperature and salt resistant polymer fluid loss additive. The fluid loss additive is a copolymer generated during the reaction of alkenyl amide, alkenyl benzene sulfuric acid, alkenyl flavanone and alkenyl sulfuric acid. The preparing method comprises the following steps: (1), weighing the four materials; (2) mixing the alkenyl sulfuric acid liquor with the alkenyl amide, the alkenyl flavanone and the alkenyl benzene sulfuric acid in a reactor, mixing, stirring, and adding nitrogen while discharging oxygen; (3) reacting at the temperature of 30 to 90 DEG C, adding initiating agents (namely, potassium persulfate and sodium hydrosulfite) with the contents of 15 to 30 percent by weight respectively, and reacting for 2 to 12 h so as to obtain a viscous-elastic jelly; and (4) pelletizing the jelly, and drying and crashing at high temperature to obtain the fluid loss additive. At high temperature, the oxydrolysis degree is low, and the action effect between functional groups on a lateral chain and clay particles is remarkable, the quality of a mud cake formed according to the method is better, and the fluid loss effect is favorable in both fresh water and a composite salt water drilling fluid.

Description

technical field [0001] The invention relates to a salt-resistant drilling fluid fluid loss reducer used for high-temperature and high-pressure formation drilling in the oil drilling process and a preparation method thereof, in particular to a polymer fluid loss reducer and a preparation method thereof. Background technique [0002] With the increasing demand for oil and gas resources and the depletion of shallow oil and gas resources, more and more attention has been paid to the exploration and development of oil and gas resources in deep formations, and the number of ultra-deep well drilling operations has increased year by year. As the formation depth increases, the formation temperature will also become higher and higher, and during the drilling process, salt formations are often encountered. Therefore, fluid loss control agents suitable for deep wells, high temperature resistance, salt resistance, and calcium and magnesium resistance have become a direction of drilling f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/58C08F226/10C08F212/14C08F220/54
Inventor 陶怀志蒲晓林王贵苏俊林赵磊
Owner SOUTHWEST PETROLEUM UNIV
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