Horizontal well drilling fluid without being mixed with oil and preparation method and application of horizontal well drilling fluid

Abstract

The invention provides a horizontal well drilling fluid without being mixed with oil and a preparation method of the horizontal well drilling fluid. The drilling fluid comprises the following components by mass: 1000 parts of water, 30-60 parts of bentonite, 5-15 parts of organic silanol, 20-30 parts of emulsified paraffin, 1-5 parts of cationic polymer, 5-15 parts of filtrate reducer, 30-50 partsof temperature resisting agent, and 0-200 parts of weighing agent. The horizontal well drilling fluid does not contain oil substances. The invention further provides an application of the horizontalwell drilling fluid without being mixed with oil. The oil substance is not added, the lubricating property of the drilling fluid is effectively improved through the matching of the cationic polymer, the emulsified paraffin and an organic silanol inhibitor together, the negative charge in the clay is effectively neutralized in the use process, the water sensitivity of the clay is reduced, the stability of the wall of a well is improved, and the requirement on the drilling fluid in the drilling process of the horizontal well is met.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling fluids, in particular to an oil-immiscible horizontal well drilling fluid and its preparation method and application. Background technique [0002] In recent years, scientific research workers have devoted themselves to the study of oil exploration to be carried out quickly and efficiently. Horizontal well drilling technology is an important means to achieve rapid and effective oil exploration. The difference in structure between horizontal wells and vertical wells leads to greater friction when drilling tools are in contact with the well wall during horizontal drilling. The fluid has better lubricity and wellbore stability. The inaccurate prediction and detection of formation pressure during drilling development leads to unreasonable design of wellbore structure and drilling fluid density, which greatly increases the technical difficulty of drilling construction. As a result, the comm...

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Problems solved by technology

The inaccurate prediction and detection of formation pressure during drilling development leads to unreasonable design of wellbore structure and drilling fluid density, which greatly increases the technical difficulty of drilling construction. As a result, the commonly used drilling fluid system cannot well meet the requirements of horizontal drilling engineering. The need for fluid lubricity and wellbore stability

[0003] In order to meet the needs of lubricity and wellbore stability in the process of horizontal drilling, a large amount of crude oil is often mixed into the drilling fluid to meet the needs of drilling engineering, but the use of crude oil can easily cause environmental pollution problems; and crude oil is a kind of A mixture with relatively stable chemical and physical properties. It is difficult to decompose crude oil on a large scale and at low cost with existing technologies, which brings great difficulties to environmental protection.

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