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A kind of channel profile control agent system of fracture-vuggy reservoir and its preparation method

A profile control agent and fracture-cavity type technology, which is applied in the field of preparation of the profile control agent system of the fracture-cavity reservoir flow channel, can solve the problems of affecting the effect of the regulator, difficult to enter the deep formation, large pressure gradient, etc. Good resistance to high temperature and high salt, rapid expansion and low expansion ratio

Active Publication Date: 2021-08-24
三智鼎业(北京)能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing agent system, under the combined influence of formation salinity and high-temperature and high-salt conditions, the regulator injected into the formation is prone to various types of degradation and structural changes, causing problems such as deposition and stratification, and affecting the final action on the In addition, when the common pre-crosslinked granular regulators are injected into the shallow low-temperature area, the pressure gradient may be too large due to rapid water absorption and expansion, and the volume of the particles will expand to the original tens. The speed of more than 10 times is too fast, it is difficult to enter the deep part of the formation, which limits the scope of depth profile control

Method used

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  • A kind of channel profile control agent system of fracture-vuggy reservoir and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0027] S1: Preparation of main ingredient gel

[0028] 12g of acrylamide was mixed with 0.8g of 1% azobisisobutyronitrile solution initiator, 0.48g of N,N-bisdimethylolurea, 0.4g of polyethylene glycol bismaleate, and then 50g of water was added. Stir in a water bath at 70° C. with nitrogen for 5 hours, then add 8 g of bentonite and vermiculite to the obtained mixed solution, keep the temperature and continue stirring for 5 hours to obtain the main ingredient gel.

[0029] S2: Preparation of channel profile control agent system for fracture-vuggy reservoirs

[0030] Move the gel of the main agent prepared in step S1 to an oven at 90°C and dry for 24 hours to obtain a gelled solid of the profile control agent, and then use a grinder and a 100-mesh sieve to grind and sieve to obtain a particle sample of the profile control agent.

Embodiment 2

[0032] The preparation process of the main agent gel and the channel profile control agent system for fracture-cavity reservoirs is the same as that of Example 1, the difference is that the amount of N,N-bisdimethylolurea is 0.64g, polyethylene glycol dimaleic acid The acid ester consumption is 0.4g, and the water consumption is 50g.

Embodiment 3

[0034] The preparation process of the main agent gel and the channel profile control agent system for fracture-cavity reservoirs is the same as that of Example 1, the difference is that the amount of N,N-bisdimethylolurea is 0.8g, polyethylene glycol bismaleic The acid ester consumption is 0.4g, and the water consumption is 50g.

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Abstract

The invention discloses a fracture-cavity oil reservoir channel profile control agent system and a preparation method thereof. The profile control agent is prepared by mixing the following raw materials in terms of mass fraction: acrylamide and N,N-bisdimethylol Base urea, polyethylene glycol bismaleate, initiator, auxiliary agent, and water were reacted under nitrogen protection at 70°C for 10 hours, and dried at 90°C for 24 hours to prepare profile control agent particles. In the present invention, N, N-bisdimethylolurea and polyethylene glycol bismaleate are respectively copolymerized with acrylamide monomers to obtain double cross-linked polymers, which are different from conventional granular profile control agent molecules and ensure At the same time, the molecular strength of the profile control agent enables it to gradually hydrolyze in water, improve the expansion of particles and adjust the plugging effect, and has a good effect of slowing expansion at low temperature, expands rapidly at high temperature, and has good resistance to high temperature and high salt. The profile control agent particles are smoothly transported to the depth of the complex pore structure of the fracture-vuggy reservoir and quickly play an adjustment role, which can meet the adjustment of reservoirs at different depths and structures.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a preparation method of a fracture-cavity reservoir channel profile control agent system. Background technique [0002] The storage characteristics of fracture-cavity reservoirs are that the reservoir space is mainly distributed in random network-like fractures, and the tight matrix rock blocks have low permeability, the water production characteristics of single wells vary greatly, the water production rules are complicated, and water breakthrough in oil wells is often There is no sign, and the water channeling is serious, and there may be a sudden stop of spraying, etc. Therefore, based on the research results of the water discharge characteristics of fracture-vuggy reservoirs, adjusting the storage space and flow channels is the key to stabilizing the reservoir water content and ensuring It is an important means for normal recovery of fracture-vuggy reser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/88C08F290/06C08F220/56
CPCC08F290/062C09K8/5083C09K8/512C09K8/882C09K8/887C08F220/56
Inventor 张继欧学峰
Owner 三智鼎业(北京)能源技术有限公司