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Micro-fracture plugging agent for oil-based drilling fluid and preparation method thereof

An oil-based drilling fluid and plugging agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of unclear plugging effect, poor compatibility, and unusable plugging agents in mud shale formations and other problems, to achieve effective sealing, good sealing effect, and the effect of preventing cracks from opening

Active Publication Date: 2018-02-09
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shortcomings or deficiencies of these technologies are: ① There is no research on micro-fractures (fractures with a width of 100 microns or less than 150 microns), and the plugging effect of shale formations with relatively developed micro-fractures is not clear; ② Partial plugging The agent cannot be used in oil-based drilling fluid, or the compatibility is not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare the cationic emulsified asphalt and Span 80 in a weight ratio of 5:2, mix them evenly and put them in the reactor for later use. The main plugging agent is nano-scale silicon dioxide. Mix nanoscale calcium carbonate, 500 mesh calcium carbonate, and 800 mesh calcium carbonate in a weight ratio of 4: 2: 2 and use it as an auxiliary main plugging agent for later use. Then heat the 50% base liquid by weight to 35-80°C, blow the 25% by weight main plugging agent and 25% by weight auxiliary plugging agent in proportion by using the shear pump attached to the reactor. To the reactor, and stir to mix evenly.

Embodiment 2

[0020] Prepare the emulsified asphalt and Span 80 in a weight ratio of 4:1, mix them evenly and put them in the reactor for later use. The main plugging agent is nano-scale silicon dioxide. Mix nanoscale calcium carbonate, 500 mesh calcium carbonate, and 800 mesh calcium carbonate in a weight ratio of 3: 1: 1 and use it as an auxiliary main plugging agent for later use. Then heat the 60% base liquid by weight to 35-80°C, blow the 20% by weight main plugging agent and 20% by weight auxiliary plugging agent in proportion by using the shear pump attached to the reactor. To the reactor, and stir to mix evenly.

Embodiment 3

[0022] Prepare the latex paraffin and Span 80 in a weight ratio of 4:1, mix them evenly and put them in the reaction kettle for later use. The main plugging agent is nano-scale silicon dioxide. Mix nanoscale calcium carbonate, 500 mesh calcium carbonate, and 800 mesh calcium carbonate in a weight ratio of 3: 1: 1 and use it as an auxiliary main plugging agent for later use. Then heat the 60% base liquid by weight to 35-80°C, blow the 20% by weight main plugging agent and 20% by weight auxiliary plugging agent in proportion by using the shear pump attached to the reactor. To the reactor, and stir to mix evenly.

[0023] The main component of Span 80 in the present invention is sorbitan monooleate.

[0024] The preparation methods in the above examples can also be mixed and compounded by using existing methods, and better trial results can also be obtained.

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PUM

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Abstract

The invention provides a microfracture plugging agent for an oil-based drilling fluid and a preparation method thereof. The microfracture plugging agent for an oil-based drilling fluid comprises, by weight, 50-60% of a base liquid, 20-25% of a main plugging agent and 20-25% of an auxiliary plugging agent. The preparation method comprises the following steps of preparing a base liquid from cation emulsified asphalt, latex asphalt or / and latex paraffin, and Span-80 according to a ratio, blending the materials to obtain a uniform mixture, putting the mixture into a reactor for next use, blending nanometer calcium carbonate, calcium carbonate of 500 meshes and calcium carbonate of 800 meshes to obtain a uniform mixture for next use, heating the base liquid to a temperature of 35-80 DEG C, blowing the main plugging agent and the auxiliary plugging agent into the reactor according to the above ratio by a shear pump of the reactor and carrying out stirring mixing to obtain a uniform mixture. The microfracture plugging agent can effectively plug microfractures of shale stratum, improves well wall stability, has good compatibility with an oil-based drilling fluid and has small influence on oil-based drilling fluid rheological properties.

Description

technical field [0001] The invention relates to a plugging agent for drilling fluid, in particular to a micro-fracture sealing agent for oil-based drilling fluid. Background technique [0002] Oil-based drilling fluid has the advantages of strong inhibition, strong anti-pollution ability, and good lubricity. However, in shale formations, due to the existence of micro-fractures, it is easy to cause wellbore instability. Therefore, the plugging performance of oil-based drilling fluid should be strengthened. , to achieve the purpose of safe drilling. At present, a lot of research work has been done on improving the plugging performance of oil-based drilling fluids in China, but less research has been done on micro-fracture plugging. Zhang Fan et al. synthesized a kind of swelling plugging agent for oil-based drilling fluid in "Synthesis and performance evaluation of an oil-based swelling plugging agent" (see "Journal of Yangtze University (Natural Science Edition)", 2010 , 7(...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/32
CPCC09K8/03C09K8/32C09K2208/10
Inventor 刘振东李公让乔军周守菊侯业贵涂德洪
Owner CHINA PETROCHEMICAL CORP
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