Nanometer polymer blocking agent for water-based drilling fluid and preparation method thereof

A nano-polymer and water-based drilling fluid technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve problems such as lack of in-depth research, failure to achieve plugging effects, and damage to drilling tools, and achieve The preparation method is simple and easy, the effect of preventing well wall collapse and low cost

Active Publication Date: 2015-09-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the plugging of micro-cracks of 1-100nm, no in-depth research has been carried out at this stage.
[0004] The particle size of sulfonated asphalt or emulsified asphalt commonly used in drilling fluids is mostly at the micron level, which can effectively seal micro-cracks at the micron level. Deposits on the surface of fractures are easily damaged by drilling fluid erosion and collision of drilling tools, which cannot achieve a good plugging effect

Method used

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  • Nanometer polymer blocking agent for water-based drilling fluid and preparation method thereof
  • Nanometer polymer blocking agent for water-based drilling fluid and preparation method thereof
  • Nanometer polymer blocking agent for water-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] ①In a 100ml three-necked flask, dissolve 0.8164g (10mmol) of piperazine in 20ml of water, add 1.0317g (10mmol) of diethylenetriamine under stirring, and fill with N 2 Slowly add 2.363g (20mmol) divinyl sulfone dropwise under the condition of 2 15min, sealed with a reversible rubber stopper. React at 45°C for 12 hours.

[0031] ② After the reaction, precipitate with 500ml of methanol for 4-6 hours, filter with suction, wash once with methanol, and then vacuum-dry at 65°C for 12-24 hours to obtain a white powdery solid.

Embodiment 2

[0033] ①In a 100ml three-necked flask, dissolve 0.8164g (10mmol) of piperazine in 20ml of N,N-dimethylformamide, add 1.0317g (10mmol) of diethylenetriamine under stirring, and fill with N 2 Slowly add 2.363g (20mmol) divinyl sulfone dropwise under the condition of 2 15min, sealed with a reversible rubber stopper. React at 45°C for 12 hours.

[0034] ② After the reaction, precipitate with 500ml methanol for 4-6 hours, filter with suction, wash once with methanol, and then vacuum-dry at 65°C for 12-24 hours to obtain a white powdery solid.

[0035] 2. Structural characterization and performance test of a nanopolymer plugging agent for water-based drilling fluid

[0036] (Taking the nanopolymer blocking agent prepared in Example 1 as an example)

[0037] 1. Structural characterization of nanopolymer plugging agent

[0038] Characterize the structure of this nanometer polymer plugging agent with infrared spectrometer, its infrared spectrogram sees figure 1 . from figure 1 I...

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Abstract

The invention discloses a nanometer polymer blocking agent for a water-based drilling fluid and a preparation method thereof. The blocking agent contains a large amount of nano particles. The preparation method comprises the following steps that 1, piperazine and diethylenetriamine are dissolved in water or an organic solvent, divinyl sulphone is added, the mole ratio of the divinyl sulphone to the piperazine to the diethylenetriamine is 2:1:1-3:1:1, N2 is continuously led into the water or the organic solvent to perform reaction at the temperature of 40-60 DEG C for 12-24 hours; 2, methyl alcohol is adopted to achieve product precipitate and washing, and vacuum drying is performed for 12-24 hours to obtain the nanometer polymer blocking agent. The blocking agent can effectively prevent drilling fluid filtrate from invading a stratum so as to prevent well wall collapse and other accidents, can be resistant to the temperature of 250 DEG C and is especially suitable for nanometer blocking of an ultra-high-temperature shale stratum of an ultra-deep well. The preparation method is reliable in principle, simple and convenient to operate and lower in cost, raw material sources are abundant, industrial production is easily achieved, and the nanometer polymer blocking agent has wide market prospect.

Description

technical field [0001] The invention relates to a nanometer polymer plugging material used for plugging nanometer pores and fractures when drilling in shale formations with developed micro-fractures during drilling operations in oil and gas fields. Background technique [0002] At present, in domestic and foreign drilling, there are often problems of well wall instability. The statistics of hundreds of wells at home and abroad show that the shale formations drilled account for 70% of the total formations drilled, and more than 90% of the well collapses occurred in Shale formations. Shale has a special fracture-pore structure, which belongs to ultra-low porosity and low permeability type, and most of them are nano-scale pore throats. According to the accumulation characteristics of shale gas, horizontal well drilling has become the main drilling method for shale gas development. Regardless of whether water-based drilling fluid system or oil-based drilling fluid system is us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C09K8/035
Inventor 谢刚罗平亚邓明毅
Owner SOUTHWEST PETROLEUM UNIV
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