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Plugging filtrate reducer elastic graphite for drilling fluid

A technology of fluid loss reducer and elastic graphite, which is applied in the directions of reagents, drilling compositions, products, etc., can solve the problems of large drilling fluid filtration loss, increased filtration loss, differential pressure sticking, etc. The effect of mechanical properties and wear resistance, expansion ratio improvement, and dispersion effect improvement

Active Publication Date: 2020-10-16
ANHUI LUHAI PETROLEUM AUX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the filtration loss of drilling fluid is too large, it is easy to cause shale expansion and collapse, resulting in instability of the wellbore
In addition, when the filtration loss increases, the filter cake thickens, which reduces the well diameter, causing a large torque to the rotating drilling tool, causing swabbing and pressure fluctuations when tripping, and easily causing pressure differential sticking

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Drilling fluid plugging fluid loss reducer elastic graphite, including the following raw materials by weight: 100 parts of fine flake graphite particles, 300 parts of mixed acid solution, 0.6 parts of potassium permanganate, 0.5 parts of ferric chloride, 20 parts of inorganic hydroxide material, 1 part of silane coupling agent, 80 parts of reaction solvent, 200 parts of dispersant, 30 parts of modifier;

[0032] The preparation method of the plugging fluid loss reducer elastic graphite for the drilling fluid is as follows:

[0033] The first step is to add fine flake graphite particles to the mixed acid solution, stir for 30 minutes at a speed of 1000r / min, then add potassium permanganate, stir for 20 minutes at a speed of 500r / min, let it stand for 1 hour, and then add ferric chloride , at a rotating speed of 1500r / min, stirring for 2 hours to obtain a mixture A;

[0034] In the second step, adding inorganic hydroxide, silane coupling agent and reaction solvent to mix...

Embodiment 2

[0049] Drilling fluid plugging fluid loss reducer elastic graphite, including the following raw materials by weight: 130 parts of fine flake graphite particles, 350 parts of mixed acid solution, 0.8 parts of potassium permanganate, 0.6 parts of ferric chloride, 30 parts of inorganic hydroxide thing, 6 parts of silane coupling agents, 90 parts of reaction solvents, 220 parts of dispersants, 40 parts of modifying agents;

[0050] The preparation method of the plugging fluid loss reducer elastic graphite for the drilling fluid is as follows:

[0051] The first step is to add fine flake graphite particles to the mixed acid solution, stir for 40 minutes at a speed of 1300r / min, then add potassium permanganate, stir for 30 minutes at a speed of 600r / min, let it stand for 1 hour, and then add ferric chloride , at a rotating speed of 1700r / min, stirring for 8 hours to obtain a mixture A;

[0052] In the second step, adding inorganic hydroxide, silane coupling agent and reaction solve...

Embodiment 3

[0067] Drilling fluid plugging fluid loss reducer elastic graphite, including the following raw materials by weight: 150 parts of fine flake graphite particles, 400 parts of mixed acid solution, 1.0 parts of potassium permanganate, 0.7 parts of ferric chloride, 60 parts of inorganic hydroxide material, 10 parts of silane coupling agent, 100 parts of reaction solvent, 250 parts of dispersant, 50 parts of modifying agent;

[0068] The preparation method of the plugging fluid loss reducer elastic graphite for the drilling fluid is as follows:

[0069] The first step is to add fine flake graphite particles to the mixed acid solution, stir for 60 minutes at a speed of 1500r / min, then add potassium permanganate, stir for 40 minutes at a speed of 1000r / min, let it stand for 1 hour, and then add ferric chloride , at a rotating speed of 2000r / min, stirring for 10 hours to obtain a mixture A;

[0070] In the second step, adding inorganic hydroxide, silane coupling agent and reaction so...

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Abstract

The invention discloses plugging filtrate reducer elastic graphite for drilling fluid. The plugging filtrate reducer elastic graphite is prepared from the following raw materials: fine flake graphiteparticles, a mixed acid solution, potassium permanganate, ferric trichloride, inorganic hydroxide, a silane coupling agent, a reaction solvent, a dispersant and a modifier. Due to the addition of theinorganic hydroxide, the expansion ratio of the pre-modified graphite in the high-temperature expansion process can be further improved; a good flame-retardant effect is achieved; basic graphite is modified; grafting polyacrylate between layers and on the layers of the basic graphite; the elastic graphite has better mechanical property and wear-resisting property; the crystalline flake graphite issubjected to high-temperature acidification; graphite particles are hollow, can deform after being subjected to external pressure, can restore to the original form after losing pressure, are high inelasticity, good in toughness and resistant to the high temperature of 500 DEG C or above, are suitable for an oil-based or water-based drilling fluid system, can be directly added into a drilling fluid slurry system, are high in compatibility, and have the properties of collapse prevention, plugging, filtrate loss reduction and the like.

Description

technical field [0001] The invention belongs to the technical field of additives for drilling fluids, and in particular relates to a plugging fluid loss reducer elastic graphite for drilling fluids. Background technique [0002] During the drilling process, due to the pressure difference, the water in the drilling fluid will inevitably leak into the formation through the well wall, causing the drilling fluid to lose water. As the water enters the formation, the clay particles in the drilling fluid will adhere to the well wall A "filter cake" is formed on the well, forming a filter cake well wall. Since the well wall of the filter cake is much denser than the original well wall, on the one hand, it prevents the drilling fluid from further dehydration, and on the other hand, it plays a role in protecting the well wall. However, during the formation of the filter cake wall, too much water is lost by filtration, the filter cake is too thick, and fine clay particles enter the fo...

Claims

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Application Information

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IPC IPC(8): C09K8/487C09K8/03
CPCC09K8/487C09K8/032Y02P20/141
Inventor 柳云涛
Owner ANHUI LUHAI PETROLEUM AUX TECH
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