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High slurry rate thixotropic bentonite slurry for horizontal crossing drilling and preparation method thereof

A technology of bentonite slurry and thixotropy, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of expensive and staggering costs, and achieve the effects of low cost, low production equipment requirements, and strong operability

Active Publication Date: 2016-03-02
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is not difficult to deduce that the proportion of chemical additives in this non-excavation special high-slurry bentonite is as high as more than 20%, and the additives used are very expensive polymer materials, so the cost of preparation is very alarming
[0020] It can be seen that there are many technical defects in the existing bentonite modification technology, especially when these technologies are used to prepare high-slurry bentonite suitable for horizontal crossing drilling, there are more problems in technical indicators and manufacturing costs.

Method used

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  • High slurry rate thixotropic bentonite slurry for horizontal crossing drilling and preparation method thereof
  • High slurry rate thixotropic bentonite slurry for horizontal crossing drilling and preparation method thereof
  • High slurry rate thixotropic bentonite slurry for horizontal crossing drilling and preparation method thereof

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preparation example Construction

[0065] The present invention also provides a preparation method for preparing a high slurrying rate thixotropic bentonite slurry, the preparation method comprising the following steps:

[0066] A. Preparation of sodium-based bentonite: sodium-based calcium-based bentonite is prepared by a known method to prepare sodium-based bentonite powder;

[0067] B. Preparation of bentonite base slurry: adding the sodium bentonite powder prepared in step A into water, stirring evenly, leaving standstill, hydration, and being mixed with bentonite base slurry;

[0068] C. Prepare modifier: mix water-soluble allyl polymer, natural magnesium-containing mineral powder and humic acid-hydrolyzed sodium polyacrylonitrile graft polymer in proportion to make modifier;

[0069] D. Preparation of modified bentonite: Add the modifying agent prepared in step C to the bentonite base slurry prepared in step B, fully stir, and complete the present invention after standing for 10-20 hours.

[0070] Step ...

Embodiment 1

[0108] Take 200g of calcium-based bentonite and pulverize, prepare 50g of 20% sodium carbonate solution, use the above-mentioned raw materials to complete the extrusion and sodiumization of calcium-based bentonite in a single-screw sodium extruder, dry the product and pulverize to obtain sodium-based bentonite powder . Take 25.6g of the above-mentioned sodium bentonite powder and add it into 400mL of water, stir evenly, and let it stand for 16 hours to prepare the bentonite base slurry. Take 0.256g of polyacrylamide, 0.128g of brucite powder, and 1.8g of hydrolyzed polyacrylonitrile sodium salt grafted lignite resin fluid loss reducer (HmPS), and mix them thoroughly to make a modifier. Add the modifier to the bentonite base slurry, stir at high speed for 2 hours and then let it stand for 15 hours.

Embodiment 2

[0110] Add 25.6g of calcium-based bentonite and 1.3g of sodium carbonate into 400mL of water, stir evenly, and let stand for 16 hours to obtain bentonite-based slurry. Take 0.0256g of polyacrylamide, 1.28g of magnesium oxide, and 2.56g of hydrolyzed polyacrylonitrile ammonium salt grafted sulfonated lignite resin fluid loss reducer (KFT-2), and mix them thoroughly to make a modifier. Add the modifier to the bentonite base slurry, stir at high speed for 2 hours and then let it stand for 15 hours.

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Abstract

The invention discloses thixotropy bentonite slurry with high mud-making rate for horizontal crossing well drilling and a preparation method of the thixotropy bentonite slurry. The thixotropy bentonite slurry is modified by a modifying agent comprising a water-soluble allyl polymer, natural magnesium containing mineral powder and a humid acid-hydrolysis sodium polyacrylonitrile graft polymer. The preparation method of the thixotropy bentonite slurry comprises the following steps: preparing sodium bentonite, preparing bentonite-based slurry, preparing the modifying agent and finally preparing the modified bentonite. The mud-making rate, the viscosity increasing efficiency and the de-filtration effect of the bentonite prepared by the method provided by the invention are greatly improved, and the modifying effect of the bentonite is far superior to that of bentonite modified by using a single modifying agent.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, relates to the technical field of processing and application of bentonite, in particular to a bentonite slurry for horizontal crossing drilling and a preparation method thereof. Background technique [0002] Horizontal directional drilling (HDD) technology originated in the West, and was first applied to laying pipelines across rivers, and later gradually expanded to municipal pipeline laying projects, crossing roads, airport runways, underground pipelines, and even underground buildings. The advantage of this technology is that it can work in busy commercial areas and industrial areas without blocking traffic, reducing the inconvenience caused to people's lives by construction in the past. In recent years, with the construction demand brought about by economic development, China has become the fastest growing HDD market in the world. HDD technology has high requirements on the pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24
CPCC09K8/16C09K8/206C09K8/24
Inventor 周风山张以河宛胤伯曹灿张志磊李德华胡攀周进生
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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