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Material for improving quality of drilling fluid filter cake, and preparation and application method thereof

An application method and drilling fluid technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as well wall instability and insufficient plugging, and achieve the effect of improving uniformity and purity

Active Publication Date: 2015-04-29
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shortcomings or deficiencies of these technologies are: ①The micropores in the filter cake are not sufficiently blocked, and there is still a lot of room for improvement in the compactness of the filter cake. When used in large sections of shale formations, if the rheological properties change, There is a possibility of causing wellbore instability; ② There are few materials for improving the quality of oil-based drilling fluid filter cake, most of which are for water-based drilling fluid, while oil-based drilling fluid improves the quality of filter cake and improves the plugging capacity. Vital to the success or failure of drilling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A material for improving the quality of drilling fluid filter cake. After mixing silica with a particle size of 100 nanometers and sepiolite with a particle size of 300 mesh at a weight ratio of 4:1, it is dispersed using a concentrated-energy ultrasonic material emulsification disperser. , so that the two are fully mixed until uniform, and then calcined at 300 ° C for 2 hours, and then dispersed by a concentrated energy ultrasonic material emulsification disperser to make a powder with uniform particle size. In one basic performance, the viscosity is 60s and the specific gravity is 1.25g / cm 3 , the demulsification voltage is 890v, the high temperature and high pressure filtration loss is 8.9ml, and the oil base drilling fluid with a lubrication coefficient of 0.045 is added with 1% (mass ratio) of the above-mentioned materials for improving the quality of the drilling fluid filter cake, the high temperature and high pressure filtration loss of the oil base drilling flui...

Embodiment 2

[0019] A material for improving the quality of drilling fluid filter cake. After mixing silica with a particle size of 500 nanometers and sepiolite with a particle size of 500 mesh at a weight ratio of 4:1, it is dispersed using a concentrated-energy ultrasonic material emulsification disperser , make the two fully mixed until uniform, then calcined at 500°C for 5h, and then disperse with a concentrated energy ultrasonic material emulsification disperser to make a powder with uniform particle size. In one basic performance, the viscosity is 60s and the specific gravity is 1.25g / cm 3 , demulsification voltage 890v, high temperature and high pressure fluid loss 8.9ml, oil-based drilling fluid with a lubrication coefficient of 0.045, after adding 3% (mass ratio) of the above materials to improve the quality of drilling fluid filter cake, the oil-based drilling fluid high temperature and high pressure fluid loss It was reduced to 4.2ml, and the lubrication coefficient was reduced ...

Embodiment 3

[0021] A material for improving the quality of the filter cake of drilling fluid. The silicon dioxide with a particle size of 20 nanometers and sepiolite with a particle size of 200 mesh are uniformly mixed in a weight ratio of 5:2. In one basic performance, the viscosity is 50s and the specific gravity is 1.15g / cm 3 After adding 1% (mass ratio) of the above-mentioned materials for improving the quality of the drilling fluid filter cake to the water-based drilling fluid with a high-temperature and high-pressure fluid loss of 10.6ml and a lubrication coefficient of 0.157, the high-temperature and high-pressure fluid loss of the oil-based drilling fluid was reduced to 8.4ml. The lubrication coefficient was reduced to 0.128.

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Abstract

The invention provides a material for improving quality of a drilling fluid filter cake, and a preparation and application method thereof. The material is prepared from nano silicon dioxide and meerschaum. The preparation method comprises the following steps: mixing the nano silicon dioxide and meerschaum, and dispersing by using an energy-gathered ultrasonic material emulsifying dispersion instrument; calcining at 300-500 DEG C for 2-5 hours; and finally, dispersing by using the energy-gathered ultrasonic material emulsifying dispersion instrument. The application method is implemented by adding 1-3 wt% of the material into a drilling fluid. According to the invention, under the condition that the nano particles can enter the micropores and microcracks of the filter cake, the compactness of the filter cake is enhanced; the fiber structure of the meerschaum can be utilized to form bridges for the pores and cracks of the filter cake, so that the plugging layer can be formed and the permeability of the filter cake can be reduced. The fiber structure of the meerschaum can enhance the toughness of the filter cake, thereby further enhancing the lubricating property of the filter cake.

Description

technical field [0001] The invention relates to the field of drilling fluid auxiliary materials, in particular to a material for improving the quality of drilling fluid filter cake and its preparation and application method. Background technique [0002] The shale formation is prone to hydration and dispersion when it encounters water, resulting in the collapse of the well wall. Judging from the current research situation, the quality of the drilling fluid filter cake is directly related to the degree of water intrusion of the shale and the stability of the borehole wall. High-quality drilling fluid filter cake can reduce drilling fluid fluid loss and reduce the amount of water intrusion into shale. Therefore, the quality of the drilling fluid filter cake is of great significance to improve the plugging effect of the shale formation and ensure the stability of the borehole wall. [0003] At present, a lot of efforts have been made at home and abroad in the research on impr...

Claims

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Application Information

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IPC IPC(8): C09K8/46C09K8/03
CPCC09K8/032C09K2208/34
Inventor 刘振东李公让周守菊侯业贵高杨张妍成冠琪卜凡康孙怡
Owner CHINA PETROCHEMICAL CORP