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Plugging agent and preparation method thereof

A technology of plugging agent and initiator, which is applied in the field of drilling and can solve the problem of small return volume

Active Publication Date: 2013-11-20
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention also discloses a plugging method using the plugging agent. The plugging method and the plugging agent are mainly aimed at large leaks, loss of return, and too small return (leakage rate of more than tens of cubic meters per hour). As well as the cracked, karst, and broken formations where blowout coexists, and the leakage problems that cannot be solved by bridge plugging, plugging while drilling, etc., the use of this plugging agent and plugging method is simple and does not require additional plugging equipment And it can effectively solve various vicious leaks, and has good application value and social value

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  • Plugging agent and preparation method thereof
  • Plugging agent and preparation method thereof

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preparation example Construction

[0130] In order to prepare the above-mentioned plugging agent, Embodiment 1 of the present invention also provides a preparation method (hydrolysis method after copolymerization) of the plugging agent, which includes the following steps:

[0131] 1) Hydrolysis method after copolymerization

[0132] Add deionized water according to the metering ratio, add the raw materials into it and stir evenly to form a monomer solution; then pass high-purity nitrogen into the monomer solution, and use frozen brine or thermal circulating water bath to control the temperature of the system (ie, the polymerization temperature); Then add an initiator to the monomer solution to initiate polymerization; after the polymerization reaction, crush the water-soluble hydrophobic association polymer colloid into particles, add sodium hydroxide or sodium carbonate to hydrolyze, dry and pulverize to obtain the product.

[0133] Wherein, the comonomers include amphiphilic unsaturated monomers, hydrophobic ...

Embodiment 2

[0146] If the water-soluble hydrophobic association polymer monomer adopts any one or more of amphiphilic unsaturated monomers, hydrophobic ethylenically unsaturated monomers and nonionic ethylenically unsaturated monomers. Then its preparation method can also be copolymerization co-hydrolysis method, comprises the following steps:

[0147] Add deionized water according to the metering ratio, add raw materials into it and stir to form a monomer solution; then add a certain quality of sodium hydroxide or sodium carbonate, stir evenly; then pass high-purity nitrogen into the monomer solution, and use freezing The temperature of the system is controlled by salt water or a thermal circulating water bath (that is, the polymerization temperature); then an initiator is added to the monomer solution to initiate polymerization; after the polymerization reaction is completed, the water-soluble hydrophobic association polymer colloid is crushed into particles, and dried and crushed Get i...

example 1

[0175] Recipe: 1.2 parts of polymer + 98.8 parts of H 2 O, viscosity 35800mPa.s, static shear force 19.0Pa; applicable conditions: shallow well, low temperature (within 70°C), pressure (difference) less than 3MPa.

[0176] Field Application

[0177] When the leakage occurred at 1629 meters in Well Liu 67-72, the mud density used was 1.02-1.03g / cm 3 , The maximum leakage liquid level is 200 meters, and the particle size of the bridging material is 3-5mm, and the cement plugging failed nine times. The liquid level was detected to be 29 meters, the drill pipe was drilled down to 1500 meters, and the plugging agent of the present invention was pumped in for 34 meters. 3 , and then inject 12m of clean water 3 , Pulled out the drilling tool and let it stand for 6 hours, then went down to the bottom of the well, and the flowback volume was normal when the pump was turned on. After 15 minutes of circulation, 150KN+65rpm drilled 8 meters, the pump pressure and displacement were all...

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Abstract

The invention discloses a plugging agent and a preparation method thereof. The plugging agent comprises a composition of a water-soluble hydrophobic associated polymer or a water-soluble hydrophobic associated polymer. The preparation method of the plugging agent is a copolymerization cohydrolysis method or a copolymerization posthydrolysis method. The plugging agent easily enters a leakage layer and has good viscoelasticity, so that the plugging agent can pass a throat and expand to fill a leakage crack and a solution cave space, meanwhile, can automatically stop flowing in the leakage layer and is unlikely to mix with oil, gas and water, thus a gel 'slug' with high viscosity and gel strength, which is capable of separating fluid in formation from fluid in a shaft, is formed; and the slug has enough starting pressure difference greater than the difference between the pressure of a mud column and the pressure of the formation fluid so as to achieve the purpose of plugging. The plugging agent and the preparation method thereof can be used for effectively solving various serious leakage and have good application value and social value.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a lost circulation agent and a preparation method thereof. Background technique [0002] Lost circulation refers to the leakage of various working fluids, including mud, cement slurry, completion fluid and other liquids, into the formation under the action of pressure difference during special downhole operations such as drilling, cementing, testing or workover. A downhole complex situation is one of the most common technical problems in downhole engineering. [0003] According to the leakage rate, the loss can be divided into five levels, namely, micro-leakage, small leak, medium leak, large leak, and malignant lost circulation. Among them, malignant lost circulation is the most serious and difficult to solve. Downhole oil and gas reservoirs in fractured and fractured formations. Vicious leakage is mainly manifested in the complete loss of circulation of the oil well working ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/44C09K8/467C08F226/02C08F220/54C08F228/02E21B33/13
CPCC04B28/02C09K8/44C09K8/487C09K8/5083C04B20/0048C04B24/2652C04B2103/40C04B24/163
Inventor 郭拥军罗平亚张新民
Owner SOUTHWEST PETROLEUM UNIV
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