Compound leak preventive for oil-based drilling fluid

An oil-based drilling fluid and anti-leakage technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as the compatibility of anti-leakage agents, and achieve permeability loss, good adaptability, and compatibility Good results

Active Publication Date: 2015-03-04
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a composite anti-leakage agent for oil-based drilling fluid in order to solve the problem of compatibility of oil-based drilling fluid anti-leakage agent and the problem of plugging deformation of micropores and micro-cracks. Affects drilling fluid properties and can improve mudcake quality and prevent loss

Method used

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  • Compound leak preventive for oil-based drilling fluid
  • Compound leak preventive for oil-based drilling fluid
  • Compound leak preventive for oil-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1: 40 parts of spherical gel products, 30 parts of superfine calcium carbonate of 10um particle diameter, 20 parts of asbestos fluff powder of length 380um, 10 parts of expanded graphite of particle diameter 75um, put in mixing equipment and carry out uniform mixing and get final product The composite anti-leakage agent for oil-based drilling fluid, wherein the spherical gel structural formula used is:

[0019]

Embodiment 2

[0020] Embodiment 2: 45 parts of spherical gel products, 21 parts of superfine calcium carbonate of 18um particle diameter, 9 parts of superfine calcium carbonate of 10um particle diameter, 15 parts of sepiolite wool of 75~380um length, 15 parts of expanded graphite of 45um Put it in the mixing equipment for uniform mixing to get the composite anti-leakage agent for oil-based drilling fluid, wherein the spherical gel structural formula used is:

[0021]

Embodiment 3

[0022] Embodiment 3: 50 parts of spherical gel products, a particle diameter of 12 parts of 18um superfine calcium carbonate, a particle diameter of 5 parts of 10um superfine calcium carbonate, a particle diameter of 3 parts of 5um superfine calcium carbonate, and a length of 180um 20 parts of asbestos velvet powder, 5 parts of expanded graphite with a particle size of 75um, and 5 parts of expanded graphite with a particle size of 45um are placed in a mixing device and mixed uniformly to obtain the composite anti-leakage agent for oil-based drilling fluid. The structural formula of spherical gel is:

[0023]

[0024] Product of the present invention is carried out relevant performance evaluation, and result is as follows:

[0025] (1) Compatibility and ability to improve mud cake

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Abstract

The invention relates to a compound leak preventive for an oil-based drilling fluid, and a preparation method of the compound leak preventive, and belongs to the technical field of a chemical drilling fluid treating agent for an oil field. The compound leak preventive for the oil-based drilling fluid comprises the following raw materials in parts by weight: a) 40-50 parts of globular gel which is polymerized by an inverse emulsion, b) 20-30 parts of 5-18micron rigid material, c) 0-20 parts of a flexible fiber which is greater than 75-380 microns, and d) 5-10 parts of expanded graphite of 45-75micron flexible particles. The compound leak preventive for the oil-based drilling fluid is prepared from the components including the four substances in a manner of mixing evenly on general mixing equipment. The compound leak preventive for the oil-based drilling fluid disclosed by the invention is prepared from granular materials, fiber materials and expansive materials; the components have a deformation block function, and have good compatibility and mud cake improving properties with the oil-based drilling fluid; and the problem of permeability loss in the drilling process can be effectively solved.

Description

technical field [0001] The invention relates to a composite anti-leakage agent for oil-based drilling fluid, which belongs to the technical field of oilfield chemical drilling fluid treatment agents. Background technique [0002] Due to the cost of oil-based drilling fluid, environmental protection and other issues, the loss of drilling fluid caused by lost circulation and the impact on the ecological environment have become increasingly prominent. The hydrophilic property of existing plugging materials while drilling has poor compatibility in oil-based drilling fluids, which is not conducive to the stability of oil-based drilling fluids; the particle size distribution of ultra-fine calcium carbonate used in large quantities and the adaptability of lost pores and fractures Insufficient capacity, the elasticity and expansion capacity of the commonly used plugging materials while drilling can not reach the best state in the oil-based system; insufficient temperature resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/03
CPCC09K8/426C09K2208/08
Inventor 郭建华刘文堂姜雪清李旭东刘昱彤万龙
Owner CHINA PETROCHEMICAL CORP
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