Oil base drilling fluid filtrate reducer as well as preparation method and application of oil base drilling fluid filtrate reducer

Abstract

The invention discloses an oil base drilling fluid filtrate reducer as well as a preparation method and application of the of oil base drilling fluid filtrate reducer. The oil base drilling fluid filtrate reducer comprises the following components in parts by weight: 70-90 parts of rubber powder and 10-30 parts of natural asphalt, wherein 2-8 parts of anti-sticking agent and calcium carbonate superfine powder is required to be added in the preparation process. The preparation method comprises the following steps of: simultaneously feeding three raw materials namely, the rubber powder, the natural asphalt and the calcium carbonate superfine powder to a winnowing crusher according to a weight ratio, controlling the material temperature to be 18-30 DEG C for mixing and crushing, and passing through a sieve with the particle size of 60 meshes, thereby obtaining the oil base drilling fluid filtrate reducer, wherein the oil base drilling fluid filtrate reducer accounts for 1-3 percent in the drilling fluid. The oil base drilling fluid filtrate reducer can resist high temperature of 250 DEG C, the filtrate reduction effect is good, the oil solubility is up to 98 percent, and the oil base drilling fluid filtrate reducer is easily biologically degraded and is harmless to the stratum.

Description

technical field [0001] The invention relates to a fluid loss reducer for drilling fluid used in the field of geological drilling, a preparation method and application thereof, in particular to an oil-based drilling fluid fluid loss reducer and a preparation method and application thereof. Background technique [0002] With the development of geological drilling work in a wider and deeper direction, the strata involved are also more complex and changeable. In the process of oil drilling, broken and water-sensitive strata and water-soluble strata such as salt rock, gypsum, and Glauber's salt are often encountered. In the process of formation drilling, it is common to encounter problems such as hole wall instability and excessive filtration loss. At the same time, in drilling operations, drilling fluid is usually added to protect the drill bit, but the drilling fluid will seep into the formation soil under pressure and cause loss. This process is called "water loss". A large am...

AI Technical Summary

Problems solved by technology

[0004] The currently used fluid loss additives are divided into water-based drilling fluid fluid loss additives and oil-based drilling fluid fluid loss additives. Among them, water-based drilling fluid fluid loss additives are effective for medium and low temperature wells, but they are not suitable for wells with temperatures higher than High-temperature wells at 120°C; oil-based drilling fluid fluid loss additives can resist high temperatures, but the current oil-based drilling fluid fluid loss additives can only withstand temperatures up to 200°C, and have poor oil solubility and fluid loss control effects Poor and biological toxicity, not easy to biodegrade, pollute the environment and other issues

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