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Reservoir protection agent composition and drilling fluid for medium-permeability reservoir and application of drilling fluid

The technology of a reservoir protective agent and composition is applied in the directions of drilling composition, earthwork drilling, flushing wellbore, etc., which can solve the problem of filtrate intrusion into the reservoir, water sensitivity, water lock damage, and poor sealing performance. and other problems to achieve the effect of 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 medium-permeability reservoirs are not fully considered, and it is inevitable that filtrate will invade the reservoir, which will lead to water sensitivity, water lock, etc. occurrence of damage

Method used

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  • Reservoir protection agent composition and drilling fluid for medium-permeability reservoir and application of drilling fluid
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  • Reservoir protection agent composition and drilling fluid for medium-permeability reservoir and application of drilling fluid

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preparation example Construction

[0038] According to the present invention, the above-mentioned reservoir protection agent can be carried out by conventional polymerization reaction, as long as the structure and composition characteristics of the reservoir protection agent in the present invention can be satisfied, preferably, the preparation of the reservoir protection agent of the present invention The method comprises: in the presence of an initiator, contacting a compound with a structure shown in formula (4), a compound with a structure shown in formula (5), a compound with a structure shown in formula (6) and an emulsifier in water to obtain an emulsified mother liquor and Carry out 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 1:0.3-1.5:0.3-1 ; The weight average molecular weight of the polymer obtained by the polymerization reaction is 60000-70000g / ...

preparation example 1

[0073] Styrene (62g, 0.59mol), butyl acrylate (35.6g, 0.28mol) and 2-acrylamido-2-methylpropanesulfonic acid (42.1g, 0.2mol) were added to 100mL of water to form a primary mother liquor, and then Add 5.9g of sodium dodecylbenzenesulfonate (purchased from Chengdu McCarthy Chemical Co., Ltd.) to obtain the emulsified mother liquor, and add 0.6g of ammonium persulfate to the emulsified mother liquor after passing nitrogen gas for 30min and then adding 0.6g of ammonium persulfate to 70°C, and then continue Raise the temperature to 75°C, and keep it warm for 5 hours; after the reaction is completed, cool the reaction solution to 30°C, add 20% by weight of sodium hydroxide aqueous solution until the pH is 8.5, then add 10mL of methanol to stir and precipitate, and place the obtained precipitate at 100°C Dry and pulverize to obtain 131 g of the protective agent solid A1 (light yellow powder) of the present invention, with a particle size of 0.7-0.8 μm. Its weight-average molecular we...

preparation example 2

[0075] p-methylstyrene (52 g, 0.44 mol), ethyl acrylate (25.6 g, 0.26 mol) and 2-acrylamido-2-methylpropanesulfonic acid (62.1 g, 0.3 mol) were added to 100 mL of water to form a primary Mother liquor, then add 6.7g of sodium lauryl sulfate (purchased from Zibo Jujin Chemical Co., Ltd.) to obtain emulsified mother liquor, and add 0.7g of azobisisobutyronitrile to the emulsified mother liquor after passing nitrogen for 30min and then warming up to 75°C , and then continue to heat up to 85 ° C, and heat preservation reaction 4.5h; after the reaction is completed, cool the reaction solution to 30 ° C, add 30% by weight of sodium hydroxide aqueous solution to pH 9.5, then add 10 mL of methanol to stir and precipitate, and the obtained precipitate Dry and pulverize at 100° C. to obtain 145 g of the protective agent solid A2 (light yellow powder) of the present invention, with a particle size of 0.7-0.8 μm. Its weight-average molecular weight is 64582g / mol, and molecular weight dist...

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Abstract

The invention discloses a reservoir protection agent composition. The composition is prepared from non-fluorescence sulfonated bitumen and a reservoir protection agent, wherein the reservoir protection agent is formed by structure units shown in formulas (1), (2) and (3) in the specification. The invention further provides a drilling fluid containing the reservoir protection agent composition for a medium-permeability reservoir. The invention further provides an application of the drilling fluid for the medium-permeability reservoir in drilling of the medium-permeability reservoir. The drilling fluid for the medium-permeability reservoir provided by the invention can show relatively good rheological property, heat-resisting property, anti-sag property and protective property.

Description

technical field [0001] The invention relates to a reservoir protection agent composition, a drilling fluid for medium 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, which increases t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C08F212/08C08F212/12C08F220/18C08F220/58C08F220/14
CPCC09K8/035E21B21/003
Inventor 蒋官澄宣扬王玺张朔安玉秀
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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