Oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid and solution technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of oil-based drilling fluids polluting the environment and being difficult to degrade, achieving economical and efficient large-scale production, low toxicity, Low biotoxic effect

Inactive Publication Date: 2017-09-15
PETROCHINA CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, with the increasing awareness of environmental protection, the shortcomings of conventional oil-based drilling fluids that pollute the environment and are difficult to degrade have become increasingly prominent

Method used

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  • Oil-based drilling fluid and preparation method thereof
  • Oil-based drilling fluid and preparation method thereof
  • Oil-based drilling fluid and preparation method thereof

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Embodiment 1

[0049] This embodiment provides a method for preparing low-toxic and environment-friendly oil-based drilling fluid, which includes the following steps:

[0050] Step 1: Converting organic sulfides in crude oil into H through primary hydrocatalytic cracking 2 S, and convert most of the olefins in the crude oil into alkanes; then remove more mercaptans in the crude oil through secondary catalytic oxidation, further reduce the sulfur content, and obtain a new type of base oil for desulfurization and dearomatization, and its performance parameters are shown in Table 1. Show;

[0051] Step 2: Mix ethanol and water at a mass ratio of 1:10 to better disperse and dissolve montmorillonite and organic modifier, then add sodium montmorillonite to dissolve, and then octadecyltrimethylammonium chloride and cetyltrimethylammonium chloride are mixed at a mass ratio of 1:1 to obtain a long carbon chain quaternary ammonium salt cationic surfactant, and the long carbon chain quaternary ammoniu...

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Abstract

The invention provides oil-based drilling fluid and a preparation method thereof. The oil-based drilling fluid comprises the following components in percentage by weight: 10-30 percent of a CaCl2 solution, 2.0-4 percent of modified organic soil, 1.0-2.0 percent of a main emulsifying agent, 1.0-2.0 percent of an auxiliary emulsifying agent, 1.0-2.0 percent of a modified rubber plugging agent, 1.0-2.0 percent of a resin type filtrate reducer, 1.0-2.0 percent of a sulfonated asphalt type filtrate reducer, 1.0-2.0 percent of a wetting agent, 1.0-1.5 percent of an alkalinity regulator, a weighing agent and the balance of base oil, wherein the mass fraction of the CaCl2 solution is 20-25 percent, and a solvent is water; the weighing agent is used for regulating the density of the oil-based drilling fluid to 0.95-2.00 g / cm<3>; the base oil comprises raw material oil after desulfurization and dearomatization treatment.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a drilling fluid used in petroleum drilling engineering, in particular to an oil-based drilling fluid and a preparation method thereof. Background technique [0002] Today, with the continuous development of drilling technology, wellbore instability in shale formations and protection of oil and gas layers have always been major technical problems that need to be solved urgently all over the world. The shale formation is unstable, and it is prone to hydration expansion when it encounters water, leading to formation collapse. This restricts the application of water-based drilling fluids in the drilling process. The development process has been greatly promoted and applied. [0003] Drilling fluid system with good performance is usually composed of base oil, organic soil, emulsifier and other main components, in addition, fluid loss reducer, wetting agent, inhibitor, v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36
CPCC09K8/36C09K2208/12
Inventor 解宇宁周晓宇张婧琪吴军康王浩徐厚英赵景原孙睿董婉刘强郑猛肖昌李庆明宁丹宇王伟明王疆宁田连雨
Owner PETROCHINA CO LTD
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