No-clay low-solid phase horizontal well section drilling fluid and preparation method thereof

Abstract

The invention relates to the technical field of drilling fluid used for the field of petroleum drilling engineering, and in particular relates to a no-clay low-solid phase horizontal well section drilling fluid and a preparation method of the drilling fluid. The no-clay low-solid phase horizontal well section drilling fluid is prepared by adding an alkalinity regulator, a filtrate reducer, an extracting agent, calcium carbonate superfine powder, a liquid lubricant and potassium chloride into water, and evenly mixing. The no-clay low-solid phase horizontal well section drilling fluid and the preparation method of the drilling fluid are simple, convenient and easy in technology, low in cost, beneficial to carrying rock debris in the horizontal section drilling process, good in temporary blockage capability and thorough in blockage removal, guarantee a wellbore to be clean, avoid the damage of highly-dispersed clay particles to the reservoir stratum, effectively prevent solid phase and liquid phase from invading the stratum, inhibit the hydration dispersing of the clay of the stratum, can effectively control the depth of a pollution zone, can well protect the reservoir stratum even if the well depth is increased and the work period is prolonged, are used for an underbalanced well, are good in temperature resistance, have the highest temperature resistance reaching up to 140 DEG C, and are suitable for all horizontal well reservoir stratum sections with the inclined depths not exceeding 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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