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 filt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example 1

[0031] Elastomeric graphite as a plugging fluid loss reducer for drilling fluids, 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 silane coupling agent, 80 parts reaction solvent, 200 parts dispersant, 30 parts modifier;

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

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

[0034] In the second step, the inorganic hydroxide, silane coupling agent and reaction solvent are added to the mixture A, and the mixture is st...

Example Embodiment

[0048] Example 2

[0049] Elastomeric graphite as a plugging fluid loss reducer for drilling fluids, 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 Material, 6 parts silane coupling agent, 90 parts reaction solvent, 220 parts dispersant, 40 parts modifier;

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

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

[0052] In the second step, add inorganic hydroxide, silane coupling agent and reaction solvent to mixture A, and stir for 1 hour at a temperature of 1...

Example Embodiment

[0066] Example 3

[0067] Elastomeric graphite as a plugging fluid loss reducer for drilling fluids, including the following raw materials by weight: 150 parts of fine flake graphite particles, 400 parts of mixed acid solution, 1.0 part of potassium permanganate, 0.7 part of ferric chloride, 60 parts of inorganic hydroxide Material, 10 parts silane coupling agent, 100 parts reaction solvent, 250 parts dispersant, 50 parts modifier;

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

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

[0070] In the second step, add inorganic hydroxide, silane coupling agent and reaction solvent to mixture A, and stir for 3 hours at a temperatur...

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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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