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Drilling fluid additive composition application thereof and water-based drilling fluid suitable for high-bearing-pressure plugging while drilling and application thereof

A composition and additive technology, applied in the field of water-based drilling fluid, can solve problems such as poor plugging effect, achieve high pressure bearing capacity, excellent plugging effect, and save drilling time

Active Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a kind of drilling fluid additive composition and its application and suitable for high-speed oil loss plugging effect of the existing drilling plugging materials. Water-based drilling fluid and its application for plugging while drilling under pressure

Method used

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  • Drilling fluid additive composition application thereof and water-based drilling fluid suitable for high-bearing-pressure plugging while drilling and application thereof
  • Drilling fluid additive composition application thereof and water-based drilling fluid suitable for high-bearing-pressure plugging while drilling and application thereof
  • Drilling fluid additive composition application thereof and water-based drilling fluid suitable for high-bearing-pressure plugging while drilling and application thereof

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preparation example Construction

[0052] According to the present invention, the above-mentioned weakly crosslinked copolymer can be prepared by various conventional methods in the art, but preferably, the preparation method of the weakly crosslinked copolymer includes: in an aqueous solvent, in an oxidation-reduction initiation system In the presence of a crosslinking agent and an emulsifier, the compound shown in formula (1'), the compound shown in formula (2') and the compound shown in formula (3') are emulsion polymerized, wherein the crosslinking The dosage of the agent makes the content of the crosslinked substructure in the weakly crosslinked copolymer obtained be 0.1-1% by weight,

[0053]

[0054] Wherein, the substituents involved in the monomers in the above method are as described above, and will not be repeated here. The compound represented by formula (1'), the compound represented by formula (2') and the compound represented by formula (3') can also be appropriately selected according to the ...

Embodiment approach

[0142] According to a preferred embodiment of the present invention, the biomimetic wall-fixing agent contains a structural unit shown in formula (I):

[0143]

[0144] In formula (I), R 1 for hydrogen, -CH 2 COOR 3 ’, or -CH 2 COOR 3 , R 2 for hydrogen, or and R 1 and R 2 at least one of n is an integer greater than 1, n R 5 Each independently is H or a group derived from dopamine and n R 5 At least one of them is a group derived from dopamine, R 4 for H or C 1 -C 10 The alkyl group, R"' is H, -CH 2 COOR 3 ’ or -CH 2 COOR 3 , and R 1 and R"' are not H, R at the same time 3 ’ is hydrogen or an alkali metal, R 3 is a group derived from dopamine.

[0145] The weight average molecular weight of the biomimetic wall-fixing agent may be 20000g / mol-150000g / mol, preferably 50000g / mol-100000g / mol.

[0146] According to the present invention, preferably, in formula (I), R 4 for C 2 -C 10 Alkyl, more preferably C 2 -C 6 of alkyl. R 4 Specific exampl...

specific Embodiment approach

[0161] According to a specific embodiment of the present invention, the preparation method of the biomimetic shale inhibitor comprises: in the presence of an inorganic acid catalyst, carrying out condensation reaction of arginine and lysine, the amount of arginine and lysine The molar ratio of the amount of amino acid is 0.2-6:1, and the condensation reaction conditions make the weight average molecular weight of the obtained biomimetic shale inhibitor 800-4000g / mol.

[0162] According to the present invention, in the preparation method of the bionic shale inhibitor, the arginine can be L-type, D-type or a mixture of the two, and the lysine can be L-type, D-type or a mixture of both. Preferably L-arginine and L-lysine are used.

[0163] According to the present invention, in the preparation method of the biomimetic shale inhibitor, the amount of the arginine and lysine is not particularly limited, as long as the weight average molecular weight of the product of the condensati...

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Abstract

The invention relates to the field of well drilling in petroleum industry, in particular to a drilling fluid additive composition application thereof and a water-based drilling fluid suitable for high-bearing-pressure plugging while drilling and application thereof. The composition contains a plugging agent, a nano blocking agent, a shear strength improving agent, a bionic wall fixing agent and a bionic shale inhibitor, wherein the plugging agent is a weak crosslinking copolymer, the content of a crosslinking structure in the weak crosslinking copolymer is 0.1-1% by weight, the nano blocking agent is modified silicon dioxide nano-particles, the shear strength improving agent is a dimer acid-organic amine copolymer, and the bionic wall fixing agent is carboxymethyl chitosan grafted with groups deviated from dopamine on main chains. The composition can make a water-based drilling fluid added with the composition as an additive produce an excellent plugging effect in the process of plugging while drilling through the matching effect of the plugging agent, the nano blocking agent, the shear strength improving agent, the bionic wall fixing agent and the bionic shale inhibitor.

Description

technical field [0001] The invention relates to the field of drilling in the petroleum industry, in particular to a drilling fluid additive composition and its application, and a water-based drilling fluid suitable for high pressure-bearing plugging while drilling and its application. Background technique [0002] Lost circulation in drilling engineering refers to the phenomenon that drilling fluid leaks from the wellbore into the formation. Lost circulation often occurs during drilling or tripping, and is a common and often encountered complex problem in oil and gas drilling. The commonly used plugging methods are bridging plugging and cement plugging. When cement slurry is used to seal cracks and karst caves, it is difficult to grasp the initial setting time and final setting time, and the construction risk is high. It is very easy to cause high-density cement slurry rapid leakage and quick-setting cement slurry to quickly solidify. Downhole accidents such as tool solidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/24C08F292/00C08F220/06C08F222/38C08F220/56C08F220/58C08F220/18C08G69/10C08B37/08
CPCC08B37/003C08F220/56C08F292/00C08G69/10C09K8/03C09K8/24C09K2208/10C08F220/06C08F220/1812C08F222/385C08F220/585C08F220/1818C09K2208/12C09K8/035C09K8/12C09K8/508C09K8/08C09K8/426C09K8/44
Inventor 蒋官澄刘冲贺垠博葛庆颖杨丽丽王勇刘凡张永清王照辉胡景东程琳
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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