Application of starch nanocrystal as flow pattern conditioning agent for drilling fluid, and drilling fluid

A technology of starch nanocrystals and flow regulators, which is applied in the field of drilling fluids, can solve the problems of poor shear dilution, poor fluid loss control, and low dynamic plasticity, and achieve the effects of improving rheology, low price, and wide sources

Active Publication Date: 2018-09-04
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems existing in the prior art that the flow regulator can greatly increase the apparent viscosity while increasing the shear force, so that the k

Method used

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  • Application of starch nanocrystal as flow pattern conditioning agent for drilling fluid, and drilling fluid
  • Application of starch nanocrystal as flow pattern conditioning agent for drilling fluid, and drilling fluid
  • Application of starch nanocrystal as flow pattern conditioning agent for drilling fluid, and drilling fluid

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preparation example Construction

[0019] In the preparation process of the starch nanocrystals, the starch used may be the starch commonly used in this field, for example, it may be natural plant starch. Preferably, the starch is selected from at least one of corn starch, wheat starch, sorghum starch, potato starch (including potato starch, tapioca or sweet potato starch, etc.) or bean starch (including pea starch, mung bean starch, etc.) .

[0020] In the preparation process of the starch nanocrystals, the acid used may be a conventional choice in the art, preferably, the acid is selected from at least one of sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid.

[0021] In the preparation process of the starch nanocrystals, the amount of the acid used only needs to ensure sufficient hydrolysis of the starch. Preferably, the ratio of the mass (g) of starch to the volume (ml) of the aqueous acid solution is 1:5-1:20, and the concentration of the acid solution is 2-4mol / L.

[0022] In the prepara...

Embodiment

[0035] The present invention will be described in detail below by way of examples.

[0036] The experimental methods described in the following examples, unless otherwise specified, are conventional methods; the reagents and materials, unless otherwise specified, can be obtained from commercial sources.

[0037] The yield of starch nanocrystals was calculated as follows:

[0038] W(%)=W 2 / W 1 *100%

[0039] In the formula, W is the yield, %;

[0040] W 1 Be the quality of starch (g);

[0041] W 2 is the mass (g) of freeze-dried starch nanocrystals after acid hydrolysis.

[0042] In the following preparation examples, a NanoBrook omni multi-angle particle size and high-sensitivity Zeta potential analyzer (Brookhaven, USA) was used to test the particle size distribution of the suspension, and a JEM-2100 (UHR) transmission electron microscope (Japan Electronics Co., Ltd.) was used to observe For the microscopic morphology of the starch nanocrystal sample, the test method...

preparation example 1

[0045] Weigh 20g of cornstarch and disperse in 100mL of sulfuric acid aqueous solution with a concentration of 3.16mol / L, stir at 45°C at a stirring speed of 200rpm, centrifuge and wash the acid hydrolysis product to pH 6 after 5 days, freeze-dry and grind Starch nanocrystal N1 was obtained at 100 meshes, with a yield of 24.1%, an average particle size of 323.7nm, and starch nanocrystal particles in the form of discs.

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Abstract

The invention relates to application of a starch nanocrystal as a flow pattern conditioning agent for a drilling fluid, and the drilling fluid, belonging to the field of petrochemical engineering. According to the invention, as the starch nanocrystal is added into the drilling fluid as a flow pattern conditioning agent, the rheological properties of the drilling fluid are effectively improved, andthe drilling fluid presents low plastic viscosity, high dynamic shear force (i.e., a high dynamic shear force ratio), good shear thinning ability and good filtrate loss reducing effect; and the starch nanocrystal is regenerable, widely available and environment-friendly, and shows excellent rheological property adjusting effect under the condition of low addition amount.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to the application of starch nanocrystals as a flow pattern regulator for drilling fluid and the drilling fluid. Background technique [0002] Drilling fluid rheology is an important performance parameter used to represent the performance of drilling fluid. During the drilling process, the rheology of the drilling fluid is closely related to carrying cuttings, suspended cuttings and barite, maintaining wellbore regularity and ensuring downhole safety. Especially in the drilling of extended-reach wells / horizontal wells, the control of rheology is related to the success or failure of drilling operations. At present, there are few types of flow regulators used in water-based drilling fluids, mainly synthetic polymers such as polyacrylic acid, polyacrylamide and polyurethane, as well as biopolymers such as bioglue and modified cellulose. However, synthetic polymers ha...

Claims

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Application Information

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IPC IPC(8): C09K8/035C09K8/20
CPCC09K8/035C09K8/206C09K2208/10
Inventor 钟汉毅沈广成邱正松周国伟汤志川黄维安赵欣李佳
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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