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Branched sulfamic acid nano plugging agent and water-based drilling fluid thereof

A technology of nano-blocking agent and sulfamic acid, which is applied in the field of drilling fluid to achieve the effects of enhanced stability, easy synthesis and low price

Inactive Publication Date: 2020-06-26
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are various plugging agents on the market, the particle size of conventional drilling fluid treatment agents is between 0.1 and 100 μm, which cannot enter the micro-nano pores of shale formations to achieve effective plugging.

Method used

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  • Branched sulfamic acid nano plugging agent and water-based drilling fluid thereof
  • Branched sulfamic acid nano plugging agent and water-based drilling fluid thereof
  • Branched sulfamic acid nano plugging agent and water-based drilling fluid thereof

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Experimental program
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Effect test

Embodiment

[0036] 1. Synthesis of branched sulfamic acid nano-blocking agent

[0037] 1. Synthesis of amino-terminated branched polymers

[0038] (1) In a 250mL three-neck flask, add 44.6mL dimethylformamide, 2 2.2237 g of 2-hydroxyethylaminopropylamine (prepared as a 5 wt % diluted solution) was added, and 1.1119 g of diallylmethylamine dissolved in 22.3 mL of dimethylformamide was titrated. After the dropwise addition, pass N 2 The air in the reaction vessel was exhausted within 15 minutes, and the reaction was stirred at 150°C for 12 hours.

[0039] (2) After the reaction, distill under reduced pressure at 105°C until no liquid drops within 5 minutes, transfer the product to a pear-shaped separatory funnel, wash with acetone for 3 to 4 times, and then dissolve the washed product with methanol , and then rotary evaporated at 45° C. under a vacuum of -0.09 MPa to remove methanol and acetone to obtain an amino-terminated branched polymer.

[0040] The particle size distribution of th...

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Abstract

The invention discloses a branched sulfamic acid nano plugging agent and a water-based drilling fluid thereof, and belongs to the technical field of drilling fluid. The nano plugging agent is a polymer prepared by taking diallyl methylamine and 2-hydroxyethylamine propylamine as the raw materials, carrying out Michael addition reaction, and then taking vinyl sulfonic acid as an end-capping reagent. The branched sulfamic acid nano plugging agent synthesized by the method has a molecular particle size of 0nm-100nm, is good in compatibility with other drilling fluid treating agents, does not gather or become large, and can be directly added into various drilling fluid base slurries to prepare the water-based drilling fluid, the synthetic raw materials are easily available, the synthetic method is simple and the branching degree is controllable, and the water-based drilling fluid can effectively plug stratum micro-cracks, improve the quality of mud cakes, stabilize a well wall and preventthe well wall from collapsing.

Description

technical field [0001] The invention relates to the technical field of drilling fluid, in particular to a branched sulfamic acid nano plugging agent and its water-based drilling fluid. Background technique [0002] The problem of wellbore instability has always been a common technical problem faced by many oilfields in the world. With the continuous development of the world's petroleum industry and the gradual expansion of exploration and development fields, the problem of wellbore instability in shale formations has become more prominent. Although oil-based drilling fluid can solve this problem to a certain extent, oil-based drilling fluid has problems such as high cost, difficult disposal of waste drilling fluid, and non-environmental protection. Therefore, water-based drilling fluid with performance equivalent to oil-based drilling fluid has been developed appears to be particularly important. [0003] The good plugging ability of drilling fluid is the basis of wellbore ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C09K8/035C09K8/24
CPCC08G83/003C08G83/004C09K8/035C09K8/24C09K2208/10
Inventor 谢刚肖玉容邓明毅白杨罗平亚
Owner SOUTHWEST PETROLEUM UNIV
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