Clay-free low-solid horizontal drilling fluid and preparation method thereof

Abstract

The invention relates to the technical field of drilling fluid used in the field of petroleum drilling engineering, and relates to a clay-free low-solid horizontal well section drilling fluid and a preparation method thereof. The clay-free low-solid horizontal well section drilling fluid is obtained by adding an alkalinity regulator to water , fluid loss reducer, cutting agent, superfine calcium carbonate, liquid lubricant and potassium chloride, and mixed to obtain. The process of the invention is simple and easy, low in cost, beneficial to cuttings carrying in the drilling process of the horizontal section, has good temporary plugging ability, complete plugging removal, ensures wellbore cleanliness, and avoids damage to reservoirs caused by highly dispersed clay particles , effectively prevent the solid and liquid phases from invading the formation, inhibit the hydration and dispersion of formation clay, and effectively control the depth of the pollution zone. In the well, it has good temperature resistance, and the highest temperature resistance can reach 140°C, which can be applied to all horizontal well reservoir sections with an inclined depth of no more than 5000m.

Description

technical field [0001] The invention relates to the technical field of drilling fluid used in the field of petroleum drilling engineering, and relates to a clay-free low-solid phase horizontal drilling fluid and a preparation method thereof. Background technique [0002] In order to make the oil layer have the largest seepage area, horizontal wells have been used as one of the main production stimulation methods in domestic oilfields, and most of them adopt open-hole completion and screen (slotted liner) completion methods, which can completely expose the oil layer and solve the problem of drilling. Reservoir protection during well completion is of great significance. Domestic research on drilling fluids and completion fluids for horizontal wells is active. Among water-based drilling fluids, solid-free and low-solid drilling fluids are mainly used. The prior art includes: 1. The Chinese patent document with publication number 101955760A discloses a solid-free drilling fluid...

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Problems solved by technology

[0003] The present invention provides a clay-free low-solid horizontal drilling fluid and its preparation method, which overcomes the above-mentioned deficiencies in the prior art and can effectively solve the current There are problems such as poor temperature resistance of drilling fluid, limitation of reservoir texture, inability to drill for a long time, inability to drill deep wells and high cost

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