Anti-collapse plugging agent, and preparation method and application thereof

A plugging agent and anti-slump technology, applied in the field of anti-slump plugging agent and its preparation, can solve the problems of large influence of drilling fluid performance, low pressure bearing capacity, poor elasticity and rigidity, etc. The effect of good temperature performance and excellent performance

Inactive Publication Date: 2017-06-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, asphalt-based plugging agents have a high level of fluorescence, and their use in exploratory wells will be limited, and they are only used in production wells in areas with low environmental protection requirements; cationic emulsified asphalts have a great...

Method used

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  • Anti-collapse plugging agent, and preparation method and application thereof
  • Anti-collapse plugging agent, and preparation method and application thereof

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Embodiment 1

[0023] The present embodiment provides an anti-collapse plugging agent, which is prepared by the following method:

[0024] 13.5g of acrylamide, 3g of 800 mesh calcium carbonate and 0.05g of N,N'-methylenebisacrylamide were added to 32g of distilled water, stirred and mixed, and the pH was adjusted to neutrality to obtain an aqueous phase;

[0025] 0.75g of octadecyl phosphoric acid monoester was dissolved in 150g of cyclohexane to obtain an oil phase;

[0026] The oil phase was placed in the reaction vessel, stirred at 600 r / min, purged with nitrogen for 30 min, and heated to 45°C at the same time, added the water phase, stirred for 60 min to make it evenly mixed, and obtained solution A;

[0027] Under nitrogen conditions, the solution A was heated to 50°C, and then 4 g of potassium persulfate aqueous solution with a mass concentration of 12.5 wt % was added dropwise. After the polymerization reaction for 3 hours, the reaction solution was cooled, and then the organic solven...

Embodiment 2

[0029] The present embodiment provides an anti-collapse plugging agent, which is prepared by the following method:

[0030] Add 11.5g acrylamide, 2g 2-acrylamido-2-methylpropanesulfonic acid, 1g 800 mesh calcium carbonate, 2g 1200 mesh calcium carbonate and 0.05g N,N'-methylenebisacrylamide to 32g Stir and mix evenly in distilled water, adjust the pH value to neutral, and obtain an aqueous phase;

[0031] 0.75g of octadecyl phosphoric acid monoester was dissolved in 150g of cyclohexane to obtain an oil phase;

[0032] The oil phase was placed in the reaction vessel, stirred at 700 r / min, purged with nitrogen for 30 min, and heated to 45°C at the same time, added the water phase, stirred for 60 min to make it evenly mixed, and obtained solution A;

[0033] Under nitrogen conditions, the solution A was heated to 50°C, and then 4 g of potassium persulfate aqueous solution with a mass concentration of 12.5 wt % was added dropwise. After the polymerization reaction for 3 hours, th...

Embodiment 3

[0035] The present embodiment provides an anti-collapse plugging agent, which is prepared by the following method:

[0036] Add 7g acrylamide, 7g 2-acrylamido-2-methylpropanesulfonic acid, 2g 1200 mesh calcium carbonate, 2g 1600 mesh calcium carbonate and 0.06g N,N'-methylenebisacrylamide to 35g distilled water Stir and mix evenly, adjust the pH value to neutral, and obtain the water phase;

[0037] 1 g of sorbitan monooleate was dissolved in 150 g of liquid paraffin to obtain an oil phase;

[0038]The oil phase was placed in the reaction vessel, stirred at 650 r / min, purged with nitrogen for 30 min, and heated to 45°C at the same time, added the water phase, stirred for 60 min to make it evenly mixed, and obtained solution A;

[0039] Under nitrogen conditions, the temperature of solution A was raised to 55°C, and 4 g of an aqueous ammonium persulfate solution with a mass concentration of 15 wt% was added dropwise. After the polymerization reaction for 3 hours, the reaction ...

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Abstract

The invention provides an anti-collapse plugging agent, and a preparation method and application thereof. According to the preparation method of the anti-collapse plugging agent, an inorganic hard monomer is added into a water phase of polymer microspheres synthesized by reversed-phase suspension polymerization, thereby preparing the polymer-microsphere-containing anti-collapse plugging agent. The anti-collapse plugging agent provided by the invention can be directly added into a water-base drilling fluid. The particle size of the polymer microspheres in the anti-collapse plugging agent is 2-300 mu m. The anti-collapse plugging agent provided by the invention has favorable temperature resistance and favorable anti-collapse effect, and can effectively inhibit the hydrous disintegration of clay. The anti-collapse plugging agent has favorable elasticity, can effectively lower the API filter loss and sand bed invasion depth of the drilling fluid, and has favorable plugging effects on pore throats with different shapes and sizes.

Description

technical field [0001] The invention belongs to the technical field of oilfield exploitation, and particularly relates to an anti-collapse plugging agent and a preparation method and application thereof. Background technique [0002] The problem of shale wellbore instability is one of the most frequently encountered and most difficult downhole complex situations in drilling engineering. This problem exists in many oil fields in the world and has not been well solved. Anti-slump drilling fluid technology has always been an important research direction of shale wellbore stabilization technology. The anti-collapse plugging agent is the basis of the anti-collapse drilling fluid. The addition of plugging particles can physically block the micro-fractures in the shale formation, thereby blocking the passage of the liquid phase of the drilling fluid into the formation and preventing the transmission of pressure. To achieve the purpose of improving the pressure bearing capacity of ...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/42C08F220/56C08F220/58C08F222/38C08F226/10C08F2/32
CPCC08F2/32C08F220/56C08F220/585C09K8/03C09K8/426C09K2208/12C09K2208/18C08F222/385
Inventor 王立辉闫丽丽王建华王发云孙明昊高珊
Owner BC P INC CHINA NAT PETROLEUM CORP
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