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High-temperature-resistant crosslinked polysaccharide polymer for drilling fluid and preparation method thereof

The technology of polysaccharide polymer and cross-linked polysaccharide is applied in the field of high-temperature resistant cross-linked polysaccharide polymer for drilling fluid and its preparation. The effect of high temperature resistance

Inactive Publication Date: 2020-09-04
北京中科日升科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Chinese invention patent with the publication number CN106336859A (publication date 2008-09-03) discloses a temperature-resistant starch composition for drilling fluid and its preparation method, which is prepared by a specific process of starch, catalyst, cationic reagent and crosslinking agent Form; Patent No. ZL201410840646.0 (public date 2015-04-29) Chinese invention patent discloses cross-linked starch for drilling fluid and its preparation method is by starch and organic phosphonate in an organic solvent in a buffer solution In the presence of esterification, it is further reacted with sodium chloroacetate under alkaline

Method used

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  • High-temperature-resistant crosslinked polysaccharide polymer for drilling fluid and preparation method thereof
  • High-temperature-resistant crosslinked polysaccharide polymer for drilling fluid and preparation method thereof
  • High-temperature-resistant crosslinked polysaccharide polymer for drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0029] This embodiment provides a high temperature resistant cross-linked polysaccharide polymer for drilling fluid, including the following raw materials in parts by weight: polysaccharide polymer (pregelatinized starch, Hebei Hengju Chemical Industry) 68kg, isocyanate (TDI-80, containing 80% by mass The mixture of 2,4-toluene diisocyanate and 20 mass percent 2,6-toluene diisocyanate, Cangzhou Dahua) 2.2kg, catalyst (organotin, T12, American Gas Chemical) 0.01kg, Organic solvent (butyl acetate, Shandong Nuoer Chemical Industry) 29.79kg.

[0030] Vacuum-dry the polysaccharide polymer in advance for later use; add 68kg of dried polysaccharide polymer and 29.79kg of organic solvent into the reaction kettle, heat up to 50°C, and stir for 1.5 hours; slowly add 2.2kg of isocyanate dropwise, at 90°C 0.01 kg of catalyst was added, and the reaction was continued for 2 hours; the product was distilled to recover the organic solvent, and then dried, pulverized, and passed through a 60-m...

Embodiment 2

[0032] This embodiment provides a high temperature resistant cross-linked polysaccharide polymer for drilling fluid, including the following raw materials in parts by weight: polysaccharide polymer 1 (pregelatinized starch, Hebei Hengju Chemical Industry) 50kg, polysaccharide polymer 2 (carboxymethyl starch , Shandong Weifang Lite) 34.8kg, isocyanate (MDI-50, 50% by mass of 2,4-diphenylmethane diisocyanate and 50% by mass of 4,4'-diphenylmethane diisocyanate Mixture of isocyanate, Wanhua Chemical) 5kg, catalyst (organic zinc, Bicat Z, Shanghai Deyin Chemical) 0.2kg, organic solvent (tetrahydrofuran, Shandong Nuoer Chemical) 10kg.

[0033] Vacuum-dry polysaccharide polymer 1 and polysaccharide polymer 2 in advance for later use; add 50kg of dried polysaccharide polymer 1, 34.8kg of polysaccharide polymer 2, and 10kg of organic solvent into the reaction kettle, heat up to 50°C, and stir 0.5 hours; slowly add 5kg of isocyanate dropwise, and react at 80°C with high-speed stirring ...

Embodiment 3

[0035] This embodiment provides a high temperature resistant cross-linked polysaccharide polymer for drilling fluid, including the following raw materials in parts by weight: polysaccharide polymer 1 (pregelatinized starch, Hebei Hengju Chemical Industry Co., Ltd.) 50 kg, polysaccharide polymer 2 (carboxymethyl fiber element, LV-CMC) 25kg, isocyanate (IPDI, isophorone diisocyanate, Covestro) 7kg, catalyst (organic bismuth, Bicat8118, American leading chemical) 0.5kg, organic solvent (methyl ethyl ketone, Guangdong Blue Arrow Chemical) 17.5 kg.

[0036] Vacuum-dry polysaccharide polymer 1 and polysaccharide polymer 2 in advance for later use; add 50kg of dried polysaccharide polymer 1, 25kg of polysaccharide polymer 2, and 17.5kg of organic solvent into the reaction kettle, heat up to 40°C, and stir 2 hours; slowly add 7kg of isocyanate dropwise, and react at 60°C with high-speed stirring for 3 hours; add 0.5kg of catalyst, continue to stir and react for 1 hour; Mesh standard ...

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Abstract

The invention discloses a high-temperature-resistant crosslinked polysaccharide polymer for drilling fluid and a preparation method thereof. The high-temperature-resistant cross-linked polysaccharidepolymer for drilling fluid is formed by chemically cross-linking a polysaccharide polymer and isocyanate in an organic solvent, and a raw material formula of the high-temperature-resistant cross-linked polysaccharide polymer comprises 50-85 parts of the polysaccharide polymer, 2-10 parts of the isocyanate, 0.01-0.5 parts of a catalyst and 10-45 parts of the organic solvent. According to the high-temperature-resistant crosslinked polysaccharide polymer for drilling fluid, molecules or particles of the high-temperature-resistant crosslinked polysaccharide polymer are crosslinked through chemicalbonds, and the high-temperature-resistant crosslinked polysaccharide polymer is good in structural stability and high in crosslinking density, has the advantages of good high temperature resistance,filtrate loss reduction, salt resistance and the like, and can be used as a high-temperature-resistant filtrate loss reducer of drilling fluid to continuously meet the requirement of high temperatureresistance in oil drilling engineering.

Description

technical field [0001] The invention belongs to the technical field of fluid loss agents for drilling fluids, and in particular relates to a high-temperature-resistant cross-linked polysaccharide polymer for drilling fluids and a preparation method thereof. Background technique [0002] In the process of oil and gas drilling, drilling fluid technology is an important part of oil and gas drilling engineering. It plays a key role in ensuring safe, high-quality and fast drilling. Since the 1920s, with the rapid development of the world's petroleum industry, the number, speed and depth of drilling have increased significantly, the formations drilled have become more complex, and the open holes have become longer and longer. requirements. [0003] With the increase of the current drilling depth, the drilling operation is becoming more and more complicated, and the wide application of technologies such as directional wells, horizontal wells, multi-lateral wells and multi-branch ...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08G18/64C08G18/75C08G18/76
CPCC09K8/035C08G18/7621C08G18/6484C08G18/7671C08G18/755C08G18/7614
Inventor 李红英权换哲冯理琼张云雷张永建孙中俊
Owner 北京中科日升科技有限公司
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