Protective agent composition of hypertonic special-hypertonic reservoir, as well as drilling fluid and applications thereof

A technology of protective agent and composition, which is applied in the direction of drilling composition, earthwork drilling, flushing wellbore, etc. It can solve the problems of filtrate intrusion into reservoir, poor sealing performance, water sensitivity, water lock damage, etc. , to achieve good rheological properties

Active Publication Date: 2015-05-27
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a temporary plugging agent is added to the drilling fluid, its plugging performance is not very strong because the structural characteristics of high-permeability and ultra-high-permeability reservoirs are not fully considered, and it is inevitable that filtrate will invade the reservoir, which will lead to water sensitivity, Occurrence of damage such as water lock

Method used

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  • Protective agent composition of hypertonic special-hypertonic reservoir, as well as drilling fluid and applications thereof
  • Protective agent composition of hypertonic special-hypertonic reservoir, as well as drilling fluid and applications thereof
  • Protective agent composition of hypertonic special-hypertonic reservoir, as well as drilling fluid and applications thereof

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preparation example Construction

[0037] According to the present invention, the above-mentioned protective agent can be carried out by conventional polymerization reaction, as long as the structure and composition characteristics of the protective agent can be satisfied in the present invention, preferably, the preparation method of the protective agent of the present invention includes: In the presence of a compound of the structure shown in formula (4), a compound of the structure shown in formula (5), a compound of the structure shown in formula (6) and an emulsifier are contacted in water to obtain an emulsified mother liquor and carry out a polymerization reaction; wherein, The molar ratio of the compound of structure shown in formula (4), the compound of structure shown in formula (5) and the compound of structure shown in formula (6) is 1:0.2-1.5:0.1-1.2; Conditions make the weight average molecular weight of the obtained polymer be 70000-85000g / mol;

[0038] Formula (4) Formula (5) Formula (6) ...

preparation example 1

[0071] Styrene (52g, 0.5mol), butyl acrylate (20g, 0.16mol) and 2-acrylamido-2-methylpropanesulfonic acid (10g, 0.05mol) were added to 100mL water to form a primary mother liquor, and then 4.5 g of sodium dodecylbenzenesulfonate (purchased from Chengdu McCarthy Chemical Co., Ltd., hereinafter the same) to obtain the emulsified mother liquor, add 0.09g ammonium persulfate when the temperature is raised to 65 ℃ after passing nitrogen in this emulsified mother liquor for 30min, Then continue to heat up to 70°C, and keep it warm for 6h; after the reaction, cool the reaction solution to 30°C, add 20% by weight of sodium hydroxide aqueous solution until the pH is 8.5, then add 4mL of methanol to stir and precipitate, and the resulting precipitate is in 100 Drying at ℃ and pulverizing to obtain 73g of the protective agent solid A1 (light yellow powder) of the present invention, with a particle size of 0.65-0.75 μm. Its weight-average molecular weight is 83462g / mol, and molecular weig...

preparation example 2

[0073] Add p-methylstyrene (47.2g, 0.4mol), ethyl acrylate (38.4g, 0.4mol) and 2-acrylamido-2-methylpropanesulfonic acid (20.7g, 0.1mol) to 100mL of water to form Primary mother liquor, then add 5.5g of sodium lauryl sulfate (purchased from Zibo Jujin Chemical Co., Ltd.) to obtain emulsified mother liquor, and add 1g of azobisisobutyronitrile to the emulsified mother liquor after 30 minutes of nitrogen gas heating to 70°C , and then continue to heat up to 75°C, and keep the temperature for 7.5h; after the reaction, cool the reaction solution to 30°C, add 30% by weight of sodium hydroxide aqueous solution to pH 9.5, then add 4mL of methanol to stir and precipitate, and the obtained precipitate Dried and pulverized at 100° C., 95 g of the protective agent solid A2 (slightly yellow powder) of the present invention was obtained, with a particle size of 0.6-0.7 μm. Its weight-average molecular weight is 80417g / mol, and molecular weight distribution coefficient is 1.3, by proton nuc...

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Abstract

The invention relates to a protective agent composition of a hypertonic special-hypertonic reservoir. The protective agent composition comprises a protective agent and a filling agent, wherein the filing agent comprises calcium carbonate of 600-1000, 300-590 meshes and 50-200 meshes in the weight ratio of 1:(4-30):(0-40), and the protective agent comprises structure units shown in the formulas (1), (2) and (3). The invention further provides a drilling fluid comprising the composition. The invention further provides applications of the drilling fluid in the drilling of the hypertonic and special-hypertonic reservoir. The drilling fluid has the advantages of being simple to use, good in environment-friendly performance, and excellent in reservoir protection performance, greatly reducing the damage of the drilling fluid to the hypertonic special-hypertonic reservoir, and bringing objective economic benefits.

Description

technical field [0001] The invention relates to a protective agent composition and drilling fluid for high-permeability and ultra-high-permeability reservoirs and applications thereof. Background technique [0002] Drilling fluid is called the blood of drilling. Excellent drilling fluid technology is one of the important guarantees to ensure the safety, quality, efficiency and speed of drilling production operations. Drilling fluid must be used in oilfield development operations. [0003] Effective reservoir protection is an effective guarantee to achieve higher oil and gas recovery, so that the skin coefficient is negative to achieve the best. During the drilling process, if the drilling fluid is improperly designed or used, the liquid and solid in the drilling fluid will invade the reservoir and have physical and chemical interactions with the clay and other minerals in the oil and gas layers, which will significantly reduce the oil layer near the wellbore. Permeability i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/24E21B21/00
CPCC09K8/03C09K8/24E21B21/00C09K8/032
Inventor 蒋官澄宣扬王玺张朔安玉秀
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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