Temporary plugging agent for pH-sensitive drilling fluid, and preparation method and using method thereof

A technology of drilling fluid and temporary plugging agent, applied in the field of temporary plugging agent, can solve the problems of poor temperature resistance, the temporary plugging agent does not have pH responsiveness, etc., achieves strong temperature resistance, restores reservoir permeability, and improves single well production Effect

Active Publication Date: 2021-12-17
CHINA PETROCHEMICAL CORP +2
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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 temporary plugging agent for pH-sensitive drilling fluid based on PEOx-DMMA modified nano silicon dioxide and

Method used

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  • Temporary plugging agent for pH-sensitive drilling fluid, and preparation method and using method thereof
  • Temporary plugging agent for pH-sensitive drilling fluid, and preparation method and using method thereof
  • Temporary plugging agent for pH-sensitive drilling fluid, and preparation method and using method thereof

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Example Embodiment

[0047] In the present invention, the preparation method of the PEOX-DMMA modified nano silica powder includes the following steps: a) adding nano silica particles to the reactor, slowly adding acetone, then adding a dispersant, stirring, and standing; b) Sequentially adding the silane coupling agent, NaOH, the first temperature rise, improves the stirring speed, hydrolyzing the silane coupling agent, a condensed reaction with a silicon dioxide particle surface; c) Add 2-methyl-2 -Oxazoline monomer, cooling, adding initiator 1, 2-methyl-2-oxazoline monomer open loop polymerization; D) hypoxia, add methacrylic acid N, N-dimethyl aminoethylene Ester, and initiator 2, reduce the stirring speed, the second temperature rise, grafting the graft copolymerization reaction of methacrylic acid N, N-dimethylaminethyl ester; E) The reaction is completed, washing, solid-liquid separation, and reduce solid matter Dry dried to give PEOX-DMMA modified nano silica powder.

[0048] In the present in...

Example Embodiment

[0082] Example 1

[0083] Preparation of PEOX-DMMA Modified Nano Silica:

[0084] a) Add 1000 g of SP15 nano silica particles to the high pressure homogenizer, slowly add 2000 ml of acetone, then add 30 g of sodium octoctyl sulse sodium succinous sodium succinous sodium, stirred at 10000 rpm to stir for 2 h;

[0085] b) 10 g of silane coupling agent KH151 was added to the reactor, and 5 g NaOH was added, and the system temperature was raised to 80 ° C, and the stirring speed was increased to 20000 rpm, and the reaction was continued for 6 h;

[0086] c) 30 g 2-methyl-2-oxazoline monomer (PEOX) was added to the above reactor, and the system temperature was lowered to 50 ° C, and 3 g of azo diisobutyronitrile was added, and the reaction was 2 h;

[0087]d) Gaoxia nitrogen removal 3 h is introduced into the reactor, 60 g of methacrylate N, N-dimethylaminethyl ester, 6 g of tert-butyl hydrogen peroxide, reduce the stirring speed to 5000 rpm, system temperature rise High to 70 ° C, con...

Example Embodiment

[0095] Example 2

[0096] Preparation of PEOX-DMMA Modified Nano Silica:

[0097] a) Add 1200 g of SP30T nano silica particles to a high pressure homogenizer, slowly add 2000 ml of acetone, then add 40 g of monoquirate monoglycerides, stirring at 10000 rpm to stir for 2 h;

[0098] b) In the above reactor, 20 g of silane coupling agent KH171 was added, and 7 g NaOH was added, and the system temperature was raised to 90 ° C, and the stirring speed was increased to 20000 rpm, and the reaction was continued for 7 h;

[0099] c) 40 g 2-methyl-2-oxazoline monomer (PEOX) was added to the above reactor, and the temperature of the system temperature was lowered to 55 ° C, and 4 g of azo isophtile nitrile was added, and the reaction was 2.5 h;

[0100] d) Gaoxia nitrogen deoxidation 3 h is introduced into the reactor, 70 g of methacrylate N, N-dimethylaminethyl ester, 7 g of tert-butyl-oxide chloroethylate is added, and the stirring speed is reduced to 5000 rpm, the temperature temperature...

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Abstract

The invention relates to a PEOx-DMMA modified nano silicon dioxide-based temporary plugging agent for a pH sensitive drilling fluid. The temporary plugging agent is prepared from PEOx-DMMA modified nano silicon dioxide, a cationic surface active agent, superfine calcium carbonate and micron fibers. PEOx and DMMA are introduced into the temporary plugging agent to jointly stabilize nano silicon dioxide, the PEOx, DMMA, superfine calcium carbonate and micron fibers have a synergistic effect, the new hydrophobic temporary plugging agent is formed, hydrophobic temporary plugging under the high-temperature condition is achieved, and the hydrophilicity and lipophilicity of a temporary plugging layer can be controlled by adjusting the pH value of drilling fluid, so recovery of the permeability of a pickling-free self-plugging-removal reservoir under the high-temperature condition is achieved.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir drilling, in particular to a temporary plugging agent added to drilling fluid during oil and gas reservoir drilling. Background technique [0002] At present, during the development of oil and gas reservoirs, the formations encountered are becoming more and more complex, and the reservoir types are also becoming more and more complex. During the contact with foreign fluids, the properties of the formations will change, such as the expansion and migration of clay minerals in the formations. , The solid phase particles of the drilling fluid enter the pores of the formation, and the liquid phase reacts with the formation minerals, etc., resulting in a decrease in the formation permeability, resulting in the inability to effectively extract the oil and gas from the reservoir to the ground during the later stage of oil recovery. Therefore, generally in the well completion stage, earth aci...

Claims

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Application Information

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IPC IPC(8): C09K8/514C09K8/508C09K8/504C09K8/84C09K8/88C09K8/90C08F292/00C08F220/34E21B33/13D01F2/00
CPCC09K8/514C09K8/5083C09K8/5045C09K8/882C09K8/845C09K8/905C08F292/00E21B33/13D01F2/00C09K2208/10C09K2208/08C08F220/34Y02P20/141
Inventor 王家航李基伟姜韡张天炬田壮壮何阳子熊振宇姚远高东亮杜帅
Owner CHINA PETROCHEMICAL CORP
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