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In-liquid leaking blocking agent for well drilling and preparation method thereof

A plugging agent and drilling fluid technology, applied in the field of plugging and plugging in drilling fluid and its preparation, can solve the problems of inability to achieve expected solidification effect, application limitation, poor alkali resistance, etc., and achieve high production and popularization and application value , The reaction conditions are easy to control, and the reaction conditions are mild.

Inactive Publication Date: 2019-07-12
XINJIANG GRAND OILFIELD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Granular plugging agent has shrinkage over time, and it is easy to crack when the cement layer is thin. In addition, the cement density and viscosity are high, which limits its application; phenolic resin has good heat resistance and flame retardancy, but its resistance Poor alkalinity, urea-formaldehyde resin is cheap, but its cured layer is brittle, easy to age, and releases free formaldehyde during use, polluting the environment. The problems of these two resins limit their application to a certain extent
Epoxy resin has high strength after curing, good corrosion resistance, does not produce small molecule volatiles during curing, does not shrink, and has excellent comprehensive performance. However, the curing reaction characteristics of epoxy resin do not match the oil well plugging conditions, and the expected curing is often not achieved effect, poor plugging reliability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The technical solution of the present invention provides a kind of plugging and sealing agent in drilling fluid, comprising the following components by weight percentage:

[0032] 50%-95% of the main agent, 1%-30% of the curing agent, 0-10% of the accelerator, 1-60% of the density regulator, 1-20% of the viscosity regulator, and the sum of each component is 100%.

[0033] Among them, the main agent is epoxy resin, specifically bisphenol A glycidyl ether epoxy resin, phenolic glycidyl ether epoxy resin, phenol glycidyl ether epoxy, glycidyl ester epoxy resin, glycidyl amine ring One or more combinations in oxygen resin, ester ring family epoxy resin, preferably bisphenol A type glycidyl ether epoxy resin;

[0034] The curing agent is a self-latent curing agent, which is specifically a microcapsule structure. The core layer is an amine curing agent, and the wall material is a high-tough engineering plastic polymer. The amine curing agent is aliphatic amine, aromatic amine...

Embodiment 2

[0050] The preparation of the plugging and sealing agent in the drilling fluid specifically includes the following steps:

[0051] Step 1: Preparation of Curing Agent

[0052] (1.1) Dissolve 12g of polyethylene in toluene to configure a polyethylene solution with a mass concentration of 1%;

[0053] (1.2) Mix and stir 100g of diethylenetriamine curing agent and 0.2g of dimethyl benzyl dodecyl ammonium bromide evenly, then disperse in deionized water with high speed stirring at 40°C to form a suspension dispersion solution, and keep the high speed stirring state , then add polyethylene solution and disperse evenly for 2 hours, so that the surface of the amine curing agent is covered with a high-toughness engineering plastic layer;

[0054] (1.3) The mixed solution is introduced into a spray dryer, spray-dried at 110° C. at a speed of 1 mL / min, and the dried particles are collected to obtain a polyethylene-coated diethylenetriamine microcapsule particle curing agent;

[0055] ...

Embodiment 3

[0062] The preparation of the plugging and sealing agent in the drilling fluid specifically includes the following steps:

[0063] Step 1: Preparation of Curing Agent

[0064] (1.1) 15g polystyrene is dissolved in toluene, is configured into the polyethylene solution of mass concentration 2%;

[0065] (1.2) Stir 100g of phenalkamine curing agent, 0.2g of dimethyl benzyl dodecyl ammonium bromide, and 50ml of polyvinyl alcohol to dissolve evenly, and then disperse them in deionized water with high-speed stirring at 50°C to form a suspension dispersion solution , keep stirring at a high speed, then add polystyrene solution and disperse evenly for 2 hours, so that the surface of the amine curing agent is coated with a high-tough engineering plastic layer;

[0066] (1.3) The mixed solution is introduced into a spray dryer, spray-dried at a speed of 1mL / min at 110°C, and the dried particles are collected to obtain a polystyrene-coated phenalkamine microcapsule particle curing agent...

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Abstract

The invention provides an in-liquid leaking blocking agent for well drilling and a preparation method thereof. The in-liquid leaking blocking agent for the well drilling and the preparation method arecharacterized in that a main agent which is resin is optimally selected, and a latent curing agent which is of a microcapsule structure is adopted, and the problem of conflict between long construction period of the blocking resin and quick curing can be solved; an accelerant is added to adjust the curing temperature and time; a density regulating agent and a viscosity regulating agent are addedto control the density and the viscosity to be within the optimal range, so that the prepared blocking agent meets the requirements on leaking blocking and water stopping of tubular columns of a 0-150DEG C wide-temperature-range oil well; the curing well section and the curing time can be customized based on the requirement of each well; the viscosity does not obviously change under certain temperature and within certain time; the blocking agent then is quickly cured; and after being cured, the blocking agent is high in pressure intensity, tensile strength and bending strength and meets the use requirement of leaking blocking and water stopping of a composite oil well environment; in addition, the preparation technology is simple and convenient; the reaction condition are mild and easy tocontrol; and the blocking agent is high in production and popularization and application value.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to the technical field of oil well plugging agents, and more specifically relates to a drilling fluid plugging and plugging agent suitable for a wide temperature range and its preparation. Background technique [0002] After the oil well development enters the middle and late stages, due to the heterogeneity of the original and epigenetic formations, the difference in fluid mobility and other reasons, the fracture surface or large and small holes will appear in the formation, resulting in increased water cut in the oil well, inefficient or ineffective circulation of water flooding, and oil recovery. Decrease, seriously restricting the sustainable and stable development of oil wells. On the other hand, due to corrosion, perforation, damage and other reasons, tubing string leakage occurs, resulting in pressure in the annulus and other phenomena, endangering the normal product...

Claims

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Application Information

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IPC IPC(8): C09K8/03C08G59/50B01J13/04
CPCB01J13/043C08G59/50C09K8/03
Inventor 徐开放韦青青张超
Owner XINJIANG GRAND OILFIELD TECH
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