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A kind of water blocking agent and its preparation method and application

A technology of water blocking agent and collector, applied in chemical instruments and methods, earthwork drilling, wellbore/well parts, etc., can solve the problem of poor stability of water blocking agent, affecting water blocking effect, easy channeling of injected water, etc. problem, to achieve the effect of ensuring dispersibility, significant oil increasing effect and good storage stability

Active Publication Date: 2021-10-01
SHANDONG DESHI CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for the traditional water shutoff agent to enter the deep formation through the pore throat of the reservoir, and it is easy to accumulate at the pore throat near the wellbore. The swept volume is small, and the subsequent injected water is easy to channel. Poor, affecting water blocking effect

Method used

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  • A kind of water blocking agent and its preparation method and application
  • A kind of water blocking agent and its preparation method and application
  • A kind of water blocking agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Example 1 Water blocking agent 1#

[0052] Water blocking agent 1# contains the following raw material components by weight: 30 parts of petroleum asphalt with a penetration of 45 (1 / 10mm) (hereinafter referred to as 45 type asphalt), petroleum asphalt with a penetration of 66 (1 / 10mm) (hereinafter referred to as 66-type asphalt) 30 parts, styrene-butadiene latex 6 parts, dodecylamine acetate 0.75 parts, AEO-23 1.25 parts, hexadecyl primary amine 0.5 parts, nano-silica 0.3 parts, glycerin 0.03 parts parts, 0.2 parts of hydrochloric acid and 50 parts of deionized water. Among them, the penetration index of petroleum asphalt with a penetration of 45 (1 / 10mm) is 0.5, the softening point is 49°C, the elongation at 15°C is 90mm, and the penetration index of petroleum asphalt with a penetration of 66 (1 / 10mm) is 0.3 , softening point 46 ℃, 15 ℃ elongation 120mm.

[0053] The preparation method of water blocking agent 1# comprises the following steps:

[0054] (1) Mix 300g ...

Embodiment 2

[0058] Example 2 Water blocking agent 2#-7#

[0059] According to the preparation method of Example 1, water shutoff agents 2#-7# with different types and contents are provided, see Table 1 for details.

[0060] Table 1

[0061]

experiment example

[0069] The following methods were used to test the stability, initial particle size, initial viscosity, asphalt viscosity at 90°C after demulsification, water blocking rate, oil blocking rate, and erosion resistance of the obtained water blocking agent. The test results are shown in Table 3. In addition, the appearance of water blocking agent 1# before and after demulsification is as follows: figure 1 with figure 2 shown.

[0070] Stability: Take 20g of water blocking agent, put it in an oven at 120°C for 24 hours, then dry it and continue to weigh the mass m 1 , to calculate the solid content w 1 = (20-m 1 ) / 20; continue to put 200mL of water blocking agent in the sampling bottle, put the sampling bottle in an oven at 120°C, take out 20g of water blocking agent from the upper layer, put it in the oven at 120°C for 24 hours, dry it and continue weighing Take mass m 2 , to calculate the solid content w 2 = (20-m 2 ) / 20; calculation stability x=[(w 1 -w 2 ) / w 1 ]%.

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Abstract

The application discloses a water shutoff agent and its preparation method and application, belonging to the field of oilfield chemicals. The water blocking agent includes the following raw material components by weight: 50-70 parts of asphalt, 5-7 parts of polymer latex, 1-3 parts of surfactant, 0.01-1 part of collector, 0.01-0.5 parts of nano silicon dioxide 0.01-0.05 parts of glycerin and 40-70 parts of deionized water. The water blocking agent is evenly dispersed, the asphalt particles are not bonded to each other, and has good storage stability; and the water blocking agent has a small initial viscosity, strong migration ability, good injection performance, and can penetrate deep into the formation to achieve Effective plugging of medium and high permeability reservoirs, with remarkable oil-increasing effect.

Description

technical field [0001] The application relates to a water shutoff agent and its preparation method and application, belonging to the field of oilfield chemicals. Background technique [0002] In the process of oil field development, water flooding plays an important role in my country's oil development. As the water flooding development gradually enters the middle and late stages, the heterogeneity of the reservoir is intensified, and the injected water penetrates downward along the reservoir, and even submerges the reservoir, resulting in an increase in the water content of the oil well, a deterioration of the water flooding effect, and an increase in the difficulty of oil recovery. [0003] Currently, water shutoff and profile control technologies include mechanical water shutoff and chemical water shutoff. Chemical water shutoff refers to the injection of chemical agents, that is, water shutoff agents, into the ground, and the water shutoff agents or their reaction produ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/514C09K8/508E21B33/13
CPCC09K8/508C09K8/5083C09K8/514C09K2208/10C09K2208/34E21B33/13
Inventor 崔仕章宋新旺侯云福王黎明郭鑫刘小芳马丽杨金兴
Owner SHANDONG DESHI CHEM IND CO LTD
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