Plugging-type filtrate reducer for water-based drilling fluid and preparation method thereof

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of cumbersome production process, high cost, and environmental pollution, and achieve simple production process and no harm to the body Small, Inexpensive Effects

Inactive Publication Date: 2013-04-17
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the deficiencies of existing research and the urgent needs of practical applications, especially the problems of viscosity increase, cumbersome production process, environmental pollution and high cost in the existing fluid loss control agents for water-based drilling fluids, the present invention aims to solve The problem is to provide a plugging fluid loss reducer for water-based drilling fluid and its preparation method

Method used

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  • Plugging-type filtrate reducer for water-based drilling fluid and preparation method thereof
  • Plugging-type filtrate reducer for water-based drilling fluid and preparation method thereof
  • Plugging-type filtrate reducer for water-based drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] (1) Weigh 200kg polymer modified oxidized asphalt (PMA) and put it on the ground for manual breaking;

[0061] (2) Spray 9kg of polyol lipid nonionic surfactant Span80 and 9kg of polyol lipid nonionic surfactant Tween80 during the stirring process for preliminary surface modification;

[0062] (3) Transfer the material in step (2) to a blast mill for crushing;

[0063] (4) The discharged material enters the dry blender through a pump, and 80kg of cellulose-modified starch is added into the dry blender, and dry blended for 30 minutes, and the discharged material is bagged to obtain a sample, which is designated as NFL-120.

[0064] According to the above sample performance evaluation method, the sample of Example 1 is evaluated, and the results are shown in 1.

[0065] Table 1 Example 1NFL-120 quality inspection results

[0066]

Embodiment 2

[0068] (1) Weigh 200kg of polymer-modified oxidized asphalt and place it on the ground to break it up manually;

[0069] (2) Spray 6kg of industrial-grade liquid CTAB and 12kg of water-soluble silicone oil OSO-w during the stirring process for preliminary surface modification;

[0070] (3) Transfer the material in step (2) to a blast mill for crushing;

[0071] (4) The discharge material enters the dry blender through the pump, and 100kg of poly(acrylonitrile-acrylamide) ammonium salt (double polyammonium salt) (HMP-21) is added to the dry blender, and it is dry mixed for 30 minutes. bag, get the sample, and record it as NFL-150.

[0072] According to the above-mentioned product performance evaluation method, the sample of Example 2 is evaluated, and the results are shown in Table 2.

Embodiment 3

[0076] (1) Weigh 200kg of polymer-modified oxidized asphalt and place it on the ground to break it up manually;

[0077] (2) Spray 6kg of industrial-grade liquid CTAB and 12kg of water-soluble silicone oil OSO-w during the stirring process for preliminary surface modification;

[0078] (3) Transfer the material in step (2) to a blast mill for crushing;

[0079] (4) The discharged material enters the dry blender through a pump, and 45kg of lignite resin is added into the dry blender, dry blended for 30 minutes, and the discharged material is bagged to obtain a sample, which is designated as NFL-170.

[0080] According to the above sample performance evaluation method, the sample of Example 3 was evaluated, and the results are shown in Table 3.

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Abstract

The invention relates to a plugging-type filtrate reducer for water-based drilling fluid and a preparation method thereof. The filtrate reducer can be selected in accordance with different well section temperatures and strata characteristics, and comprises polymer modified oxidized asphalt (PMA), a modifying agent and an auxiliary filtrate reducer; and the filtrate reducer series samples can be prepared by a simple surface modification and dry-blending process. The sample disclosed by the invention is excellent in performance of reducing filtrate of the drilling liquid with the reducing rate of 80%, a dense and tough mud cake is formed, and the crack and fracture of the strata can be plugged in real time based on high-temperature softening and deforming characteristic of the asphalt; an appropriate product formula can be selected depending on the applied strata characteristics and well section temperatures; and the plugging-type filtrate reducer for the water-based drilling fluid is flexile to use, simple in production process, moderate in condition, high in production efficiency, low in cost, free from waste and dust, and low in harm on the body of an operator.

Description

technical field [0001] The invention belongs to oilfield chemicals used in water-based drilling fluid systems, in particular to a plugging fluid loss reducer used in water-based drilling fluids and a preparation method thereof. Background technique [0002] The functions of water-based drilling fluid mainly include the following aspects: carrying cuttings, cooling drilling tools, plugging and preventing collapse, reducing water loss, lubricating drill bits, transmitting information, assisting rock breaking, balancing and controlling formation pressure, etc. The filtration loss into the formation is one of the main aspects. Fluid loss reducer, also known as fluid loss reducer and fluid loss control agent, can form a low-permeability, flexible, thin and dense filter cake on the well wall, and is a type of oilfield chemical that minimizes the fluid loss of drilling fluid . Fluid loss additives are mainly divided into the following categories: cellulose, humic acid, acrylic po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/44
Inventor 周风山王焕娜刘锋报张志磊向玺国文月
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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