Cross-linked starch for drilling fluid and preparation method thereof

A cross-linked starch and drilling fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor viscosity-increasing effect, weak temperature resistance, single function, etc., and achieve outstanding effect and temperature resistance The effect of improving and raising viscosity

Active Publication Date: 2017-02-01
北京中科日升科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the modified starches currently used in oilfields have relatively single functions. For example, although the commonly used carboxymethyl starch has good fluid loss reduction and salt resistance effects, it has weak temperature resistance and low viscosity; although the modified starch DFD-140 is resistant to The ability to reduce temperature and fluid loss is good, but the effect of thickening is poor. It is difficult for these modified starches to have multi-functional characteristics at the same time.

Method used

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  • Cross-linked starch for drilling fluid and preparation method thereof
  • Cross-linked starch for drilling fluid and preparation method thereof
  • Cross-linked starch for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 100Kg of cornstarch and 30Kg of alcohol (85% v / v) were added to the reactor, and a 30wt% aqueous solution of sodium salicylate phosphonate made by dissolving 6Kg of sodium salicylate phosphate in water was added to the reactor. Mix the solution prepared by dissolving 0.3Kg sodium dihydrogen phosphate in 1.5Kg water and the solution prepared by dissolving 1.8Kg sodium monohydrogen phosphate in 9Kg water to obtain a buffer solution (pH is 7-9), and add the buffer solution to the reaction kettle After stirring evenly, keep the temperature at about 50°C and react for 30 minutes; slowly add 50wt% sodium hydroxide aqueous solution made of 8Kg of sodium hydroxide solution into the reaction kettle, keep the temperature at 70°C, and fully stir for 20 minutes Finally, make 30wt% sodium chloroacetate aqueous solution with 10Kg sodium chloroacetate, and join in the reactor, keep temperature about 70 ℃, fully react 60 minutes; Dissolve 0.07Kg epichlorohydrin in alcohol (85% v / In v)...

Embodiment 2

[0030] Add 100Kg of potato starch and 30Kg of alcohol (90% v / v) into the reactor, dissolve 8Kg of potassium diethylvinylphosphonate in water to make a 30wt% aqueous solution of potassium diethylvinylphosphonate and add it to the reactor , mix the solution prepared by dissolving 0.3Kg sodium dihydrogen phosphate in 1.5Kg water and the solution prepared by dissolving 1.5Kg sodium monohydrogen phosphate in 8Kg water to obtain a buffer solution (pH 7-9), and add the buffer solution to Put it into the reaction kettle, stir evenly, keep the temperature at about 50°C, and react for 30 minutes; dissolve 10Kg of potassium hydroxide in water to make a 50wt% potassium hydroxide aqueous solution, and slowly add it to the reaction kettle, keeping the temperature at 60°C After fully stirring for 30 minutes, the 30wt% sodium chloroacetate aqueous solution made by dissolving 8Kg sodium chloroacetate in water was also added to the reaction kettle, and the temperature was kept at about 60°C. Aft...

Embodiment 3

[0032]Add 60Kg of potato starch, 40Kg of tapioca starch and 35Kg of methanol into the reactor, add 30wt% aqueous pyrophosphate diester solution prepared by dissolving 10Kg of pyrophosphate diester in water, and add 1.6Kg of sodium monohydrogen phosphate into the reactor. The solution prepared in 8Kg water and the solution prepared by dissolving 0.1Kg citric acid in 1.5Kg water are mixed to obtain an alkaline buffer solution (pH is 7-9), and the buffer solution is added to the reaction kettle, and after stirring, keep The temperature is around 60°C, react for 40 minutes; slowly add 50wt% sodium hydroxide aqueous solution made by dissolving 10Kg of sodium hydroxide in water into the reaction kettle, keep the temperature at 70°C, stir well for 20 minutes, then add 8Kg of chloroacetic acid 30wt% sodium chloroacetate aqueous solution made by dissolving sodium in water, keep the temperature at about 70°C, and react for 80 minutes; add 30wt% epichlorohydrin methanol solution made by d...

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Abstract

The invention relates to cross-linked starch for drilling fluid and a preparation method thereof. The cross-linked starch for the drilling fluid is prepared through steps as follows: starch and organic phosphonate are esterified in an organic solvent under the presence of a buffer solution, then act with sodium chloroacetate under an alkaline condition and have a cross-linking reaction under the action of an initiating agent and a crosslinking agent, wherein with the weight of raw material starch as a reference, the weight fraction of other raw materials is as follows: organic phosphonate accounts for 5-10%, the organic solvent accounts for 30-40%, sodium chloroacetate accounts for 5-15%, the initiating agent accounts for 0.05-1%, the crosslinking agent accounts for 0.05-0.1% and a basifier accounts for 5-15%. The cross-linked starch for the drilling fluid has the advantages of good filtrate loss reduction, adhesion improvement, temperature resistance, salt resistance and the like and is high in stability.

Description

technical field [0001] The invention belongs to the technical field of fluid loss agents for drilling fluids, in particular to cross-linked starch 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. This will inevitably prompt people to try to find various raw materials and treatment agents for preparing drilling fluids, study the relationship between their performance and drilling work, and gradually develop various drilling fluid testing instruments and equipment, so that drilling fluid techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B31/00C08B31/12C08B31/04C09K8/035
Inventor 孙保明权换哲冯理琼
Owner 北京中科日升科技有限公司
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