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Temperature-resistant salt-resistant nano anti-collapse filtrate reducer for drilling fluid and preparation method thereof

A technology of temperature resistance and salt resistance and fluid loss control agent, which is applied in the field of drilling fluid and completion fluid, and can solve problems such as poor resistance to salt.

Active Publication Date: 2016-02-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Published patents CN103897094A and CN103936914A disclose two nanomaterials with anti-slump function and fluid loss control function and their preparation methods that can be applied in the drilling fluid field. Vinyl monomers and oil-soluble vinyl monomers are polymerized from reactive monomers, and the temperature resistance can reach 220°C, but the salt resistance of these two nanomaterials is poor, especially the ability to resist divalent metal salts

Method used

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  • Temperature-resistant salt-resistant nano anti-collapse filtrate reducer for drilling fluid and preparation method thereof
  • Temperature-resistant salt-resistant nano anti-collapse filtrate reducer for drilling fluid and preparation method thereof
  • Temperature-resistant salt-resistant nano anti-collapse filtrate reducer for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 100g of distilled water into a 250mL three-neck round bottom flask, heat it in a water bath to 65°C, then add 30g of methyl methacrylate, 3g of N-vinylpyrrolidone, 8g of 2-acrylamide-2-methylpropanesulfonic acid and 0.2g of divinyl Base benzene, nitrogen protection, high-speed stirring for 15min, the stirring speed is 300-400r / min, then add 0.2g of initiator potassium persulfate, continue high-speed stirring (300-400r / min), water bath temperature control between 65℃~70℃ , reacted for 6 hours, and after the reaction was completed, the obtained emulsion was spray-dried to obtain a high-temperature and salt-resistant polymer microsphere anti-slump fluid loss additive.

Embodiment 2

[0024] Add 100g of distilled water to a 250mL three-neck round bottom flask, heat it in a water bath to 75°C, then add 15g of methyl acrylate, 2g of N-vinylpyrrolidone, 5g of 2-acrylamide-2-methylpropanesulfonic acid and 0.1g of divinylbenzene , nitrogen protection, high-speed stirring for 15 minutes, the stirring speed is 300 ~ 400r / min, then add 0.1g of initiator potassium persulfate, continue high-speed stirring (300 ~ 400r / min), water bath temperature control between 75 ° C -80 ° C, the reaction After 4 hours, after the reaction is completed, the obtained emulsion is spray-dried to obtain a high-temperature resistant polymer microsphere anti-slump fluid loss additive.

[0025] Performance evaluation:

[0026] (1) Macrostructure and microstructure:

[0027] The polymer microsphere anti-slump fluid loss agent obtained in the implementation of 1-2 is a white powdery solid in appearance.

[0028] Such as figure 1 Shown are scanning electron micrographs of the temperature-re...

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Abstract

The invention discloses a temperature-resistant salt-resistant nano anti-collapse filtrate reducer and a preparation method thereof. The filtrate reducer is prepared by 12 to 25 percent by weight of oil-soluble vinyl monomer, 3 to 11 percent by weight of water-soluble vinyl monomer, 0.05 to 0.2 percent by weight of cross-linking agent, 0.05 to 0.3 percent by weight of initiator and balance of water in a polymerization method by virtue of soap-free emulsion, wherein the oil-soluble vinyl monomer is methyl acrylate or methyl methacrylate; the water-soluble vinyl monomer comprises 1 to 3 percent by weight of N-vinyl pyrrolidone and 2 to 8 percent by weight of 2-acrylamide-2-methyl propane sulfonic acid. The temperature-resistant salt-resistant nano anti-collapse filtrate reducer for the drilling fluid is applied to the drilling fluid and has an excellent filtration reduction function and an excellent anti-collapse function; moreover, the temperature resisting performance and the salt resisting performance are remarkably better than that of a material disclosed in patents Cn201410141841.4 and Cn201410142391.0, the resisting temperature can reach 240 DEG C, the concentration of the resisted calcium chloride is 0.5 percent by weight or more, the concentration of the resisted sodium chloride is saturated, and the rheology impact on the drilling fluid is relatively small.

Description

technical field [0001] The invention belongs to the field of drilling fluid and well completion fluid in oil and gas field drilling and completion, and particularly relates to a temperature-resistant and salt-resistant nanometer anti-slump fluid loss reducing agent for drilling fluid and a preparation method thereof. Background technique [0002] Wellbore instability during drilling has always been the main factor affecting the smooth progress of drilling. The development of micro-fractures in the hard and brittle shale in the formation is one of the main causes of wellbore instability. Therefore, the effective plugging of micro-fractures in hard and brittle shale is an effective method to solve the problem of wellbore instability. The micro-fractures of hard and brittle shale are generally at the micron or even nanometer level, so nanomaterials can be used to effectively seal the micro-fractures of hard and brittle shale. [0003] Published patents CN103897094A and CN1039...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/58C08F226/10C08F212/36C09K8/035
Inventor 解洪祥王绪美刘音王红科赵福祥左凤江王家梁程智
Owner BC P INC CHINA NAT PETROLEUM CORP
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