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Water-based film-forming agent and preparation method thereof, water-based drilling fluid and application thereof

A technology of water-based drilling fluid and film-forming agent, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of low pressure bearing capacity and high cost, protect oil and gas layers, promote deposition, and stabilize well wall Effect

Active Publication Date: 2021-03-16
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a water-based film-forming agent for drilling fluid in order to overcome the defects that the plugging effect of the existing water-based film-forming agent for drilling fluid needs to be further improved, low pressure bearing capacity and high cost. Agent and preparation method thereof, water-based drilling fluid and application thereof, the water-based film-forming agent for drilling fluid is suitable for shielding temporary plugging technology, has high pressure bearing capacity, good plugging effect, low cost, environment-friendly, easy Realize the advantages of industrialized large-scale production

Method used

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  • Water-based film-forming agent and preparation method thereof, water-based drilling fluid and application thereof
  • Water-based film-forming agent and preparation method thereof, water-based drilling fluid and application thereof
  • Water-based film-forming agent and preparation method thereof, water-based drilling fluid and application thereof

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Experimental program
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Embodiment approach

[0045] According to a preferred embodiment of the present invention, the water-based drilling fluid is an efficient anti-collapse water-based drilling fluid (HPWM drilling fluid), and the density of the water-based drilling fluid is 1.23g / cm 3 , the water-based drilling fluid is composed of sodium bentonite, sodium carbonate, potassium chloride, xanthan gum, high viscosity polyanionic cellulose, sodium acrylate-acrylamide copolymer, sulfonated phenolic resin, polymer alcohol, barite powder It is obtained by mixing the film-forming agent with seawater. Relative to the weight of water in the water-based drilling fluid, the content of the sodium-based bentonite is 2-4% by weight, the content of the sodium carbonate is 0.1-0.3% by weight, and the content of the potassium chloride is 3 -5% by weight, the content of the xanthan gum is 0.2-0.3% by weight, the content of the high viscosity polyanionic cellulose is 0.2-0.3% by weight, the content of the sodium acrylate-acrylamide copol...

preparation example 1-6 and comparative preparation example 1-8

[0060] At 10-30°C, with a stirring rate of 100-150r / min, mix the low-permeability treatment agent, inorganic fiber, resin compound and acrylic polymer for 1-3 hours until the materials are evenly mixed to obtain a water-based film agent.

preparation example 1

[0062] The scanning electron micrograph of the calcium carbonate whisker that uses in preparation example 1 is as figure 1 and figure 2 as shown, figure 1 and figure 2 The magnifications are 1000 times and 7000 times, respectively, by figure 1 and figure 2 It can be seen that the microscopic morphology of the calcium carbonate whiskers is a needle-like material with an average diameter of 0.25-1.5 μm and an average length of 3-25 μm.

[0063] Table 1

[0064]

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Abstract

The invention relates to the field of petroleum and natural gas engineering drilling, and discloses a water-based film forming agent for a drilling fluid, a preparation method of the water-based filmforming agent, a water-based drilling fluid containing the water-based film forming agent, and application of the water-based drilling fluid. The water-based film forming agent comprises a low permeability treating agent, inorganic fiber, a resin compound and an acrylic polymer, wherein the low permeability treating agent is a polyhydroxy compound and / or a hydroxy-aluminium complex; the inorganicfiber is a calcium carbonate whisker; and the average diameter of the inorganic fiber is 0.2-3 [mu]m, the average length of the inorganic fiber is 3-30 [mu]m, and the ratio of length to diameter of the inorganic fiber is 4-50. The water-based film forming agent is applied to a shielding temporary plugging technique, and has the advantages of being high in pressure bearing capacity, good in plugging effect, low in cost, environmentally friendly, easy for realizing industrial mass production and the like.

Description

technical field [0001] The invention relates to the field of oil and gas engineering drilling, in particular to a water-based film-forming agent for drilling fluid, a preparation method of the water-based film-forming agent, a water-based drilling fluid containing the water-based film-forming agent, and the water-based film-forming agent. Application of base drilling fluid. Background technique [0002] In the drilling process of oil and gas exploration and development, wellbore instability will lead to more complex drilling operations and may lead to serious drilling accidents, and the use of drilling fluid to seal the wellbore is a major technology to prevent wellbore instability in this field measure. [0003] The plugging effect is to add special additives in the drilling fluid, such as asphalt, oil residue and other materials, which can be used to plug micro-cracks or loose broken zones in rock formations that are mechanically unstable, and prevent moisture in the dril...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/035C09K8/24C09K8/16C09K8/42
CPCC09K8/03C09K8/032C09K8/035C09K8/16C09K8/24C09K8/426C09K2208/08
Inventor 刘均一郭保雨陈二丁宿振国邱维清柴金鹏王宝田蒋莉肖林通王旭东赵红香
Owner CHINA PETROCHEMICAL CORP
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