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Environmental-friendly type oil-based drilling fluid and preparation method thereof

A drilling fluid, all-oil-based technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as poor plugging ability and poor suspension ability, and achieve good plugging performance, simple preparation process, and reservoir formation. small damage effect

Active Publication Date: 2012-01-04
克拉玛依市金鑫科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The invention provides an environment-friendly all-oil-based drilling fluid and a preparation method thereof, which overcomes the deficiencies of the prior art, solves the problems of white oil full-oil-based drilling fluids such as poor plugging ability and poor suspension ability, and improves the sealing capacity. Plugging capacity and rock-carrying capacity, with the characteristics of safety, environmental protection and protection of oil and gas layers

Method used

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  • Environmental-friendly type oil-based drilling fluid and preparation method thereof

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Effect test

Embodiment 1

[0032] Embodiment 1, the environment-friendly full oil-based drilling fluid is made according to the following raw materials by weight: 90 to 100 parts of base fluid white oil, 0 to 10 parts of calcium chloride aqueous solution, 2 to 4 parts of emulsifier, 1 to 3 parts of aerosol, 2 to 4 parts of organic soil for drilling fluid, 3 to 5 parts of composite plugging agent, 0.5 to 1.5 parts of cutting agent, 2.5 parts of alkalinity regulator, 2 parts of fluid loss reducer Parts to 3 parts, adding 0 to 137 grams of weighting agent per 100 milliliters of the above raw material mixture; wherein, the concentration of calcium chloride aqueous solution is 5% to saturation concentration at normal temperature; the composite plugging agent is modified natural asphalt powder , active superfine calcium carbonate, rubber powder, and polypropylene fiber are compounded from four raw materials, and the weight proportions are 60 to 65, 30, 3, 7 to 2 parts in sequence.

Embodiment 2

[0033] Embodiment 2, the environment-friendly full oil-based drilling fluid is made according to the following raw material parts by weight: 90 parts or 100 parts of base liquid white oil, 0 or 10 parts of calcium chloride aqueous solution, 2 parts or 4 parts of emulsifier, emulsifier 1 or 3 parts of aerosol, 2 or 4 parts of organic soil for drilling fluid, 3 or 5 parts of composite plugging agent, 0.5 or 1.5 parts of cutting agent, 2.5 parts of alkalinity regulator, 2 parts of fluid loss reducer part or 3 parts, adding 0 or 137 grams of weighting agent per 100 milliliters of the above raw material mixture; wherein, the weight percentage concentration of calcium chloride aqueous solution is 5% or saturated concentration at normal temperature; the composite plugging agent is modified natural asphalt powder , active superfine calcium carbonate, rubber powder, and polypropylene fiber are compounded from four raw materials, and the weight proportions are 60 or 65, 30, 3, 7 or 2 par...

Embodiment 3

[0034] Embodiment 3, the environment-friendly full oil-based drilling fluid is made according to the following raw materials by weight: 90 parts of base fluid white oil, 0 parts of calcium chloride aqueous solution, 2 parts of emulsifier, 1 part of wetting agent, and 2 parts of organic soil, 3 parts of composite sealing agent, 0.5 part of cutting agent, 2.5 parts of alkalinity regulator, 2 parts of fluid loss reducer, and 0 g of weighting agent is added to every 100 ml of the above raw material mixture; The plugging agent is made of modified natural asphalt powder, active superfine calcium carbonate, rubber powder and polypropylene fiber by compounding four kinds of raw materials.

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Abstract

The invention relates to the technical field of an oil-based drilling fluid for petroleum drilling, in particular to an environmental-friendly type oil-based drilling fluid and a preparation method therefore. The environmental-friendly type oil-based drilling fluid is prepared from the following raw materials: base liquid white oil, calcium chloride water solution, an emulsifying agent, a wetting agent, organic oil for drilling fluid, a composite plugging agent, a shear strength improving agent, a basicity regulating agent and a fluid loss additive; and a weighting agent is added into a mixture of the raw materials. The oil-based drilling fluid has the following advantages of: good plugging property, high shear viscosity and strong rock carrying capability; the EC 50 (median effect concentration) of the drilling fluid is larger than 3*104mg / L; the drilling fluid has good environmental safety; the return permeability of the drilling fluid can reach 90%-98%; the drilling fluid has little damage to reservoirs; the preparation process of the drilling fluid is simple; the drilling fluid is mainly applied to a special construction technology such as underbalance, horizontal wells and the like, water sensitivity reservoirs and low-pressure low permeability gas wells.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling all-oil-based drilling fluid, and relates to an environment-friendly all-oil-based drilling fluid and a preparation method thereof. Background technique [0002] Oil-based drilling fluid refers to the drilling fluid with oil as the continuous phase. Compared with water-based drilling fluid, oil-based drilling fluid has the advantages of high temperature resistance, salt and calcium intrusion resistance, good borehole wall stability, good lubricity and damage to oil and gas layers. It has many advantages such as small degree, and has developed into an important means of drilling difficult high-temperature deep wells, high-inclination directional wells, horizontal wells, underbalanced wells and various complex formations, and has a broad application prospect. [0003] Full oil-based drilling fluid refers to a water-in-oil emulsified drilling fluid in an almost anhydrous state with oil as ...

Claims

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Application Information

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IPC IPC(8): C09K8/36C09K8/03
Inventor 王茂仁冯建建王晨王军肖达士许传云肖露齐琅张良李兴发
Owner 克拉玛依市金鑫科技有限公司
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