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A kind of high-efficiency selective water shutoff agent for oil field and preparation method thereof

A water plugging agent and high-efficiency technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of polymer plugging agents' poor resistance to mineral pollution, high production cost of oil-based plugging agents, and alcohol-based plugging agents. Complex problems, to achieve strong selective water blocking effect, small damage, mild preparation conditions

Active Publication Date: 2018-07-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chemical water blocking is a commonly used water blocking method. Now there are selective blocking agents such as polymer blocking agents, foam blocking agents, oil-based blocking agents, and alcohol-based blocking agents. However, the current water blocking agents have high costs, Disadvantages such as complex operation process, poor selectivity, and susceptibility to salt and calcium pollution
For example, the effective period of the foam water blocking agent is short and the operation process is relatively complicated. Please refer to the application number 201010140446.6, the invention name is a water blocking agent with dual functions and its injection method; the production cost of the oil-based blocking agent is high and the environmental pollution is relatively large. ; Alcohol-based plugging agents are complex to operate and poor in water plugging effect; some polymer plugging agents have poor anti-mineral pollution ability, and cause a significant drop in oil layer productivity

Method used

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  • A kind of high-efficiency selective water shutoff agent for oil field and preparation method thereof
  • A kind of high-efficiency selective water shutoff agent for oil field and preparation method thereof
  • A kind of high-efficiency selective water shutoff agent for oil field and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The high-efficiency selective water shutoff agent for oilfields in this embodiment, the synthetic monomers and the dosage are: 22.0% carboxymethylacrylamide, 12.0% acrylic acid, 6.0% 2-acrylamide-2-methylpropanesulfonic acid, dimethyl dimethicone Allyltrimethylammonium chloride 3.0%, GL-1 0.1%, WD-80 0.1%, k 2 S 2 o 8 0.3%, Na 2 SO 3 0.15%.

[0044] The method for preparing the above-mentioned embodiment 1 water blocking agent is as follows:

[0045] Step 1: At room temperature, add 50 mL of deionized water to the three-necked flask, and at the same time pass nitrogen gas to discharge the air in the flask;

[0046] Step 2: Turn on the agitator and add 11.0g carboxymethylacrylamide, 6g acrylic acid, 3g 2-acrylamide-2-methylpropanesulfonic acid, 1.5g dimethyldiallyltrimethyl chloride while stirring Ammonium, then fully stirred to make it fully dissolved;

[0047] Step 3: Add 0.05g of silicone coupling agent GL-1 and 0.05g of silicone coupling agent WD-80, and the...

Embodiment 2

[0053] The high-efficiency selective water shutoff agent used in oil fields in this embodiment, the synthetic monomers and the dosage are: 18.0% of acrylamide, 12.0% of methyl silicic acid, 6.0% of 2-acrylamide-2-methylpropanesulfonic acid, dimethyl dimethicone Allyltrimethylammonium chloride 3.0%, GL-10.15%, WD-80 0.15%, k 2 S 2 o 8 0.3%, Na 2 SO 3 0.15%.

[0054] The method for preparing the above-mentioned embodiment 2 water blocking agent is as follows:

[0055] Step 1: At room temperature, add 50 mL of deionized water to the three-necked flask, and at the same time pass nitrogen gas to discharge the air in the flask;

[0056] Step 2: Turn on the agitator, add 9.0g acrylamide, 6g methyl silicic acid and 3g 2-acrylamide-2-methylpropanesulfonic acid, 1.5g dimethyl diallyl trimethyl chloride while stirring Ammonium, then fully stirred to make it fully dissolved;

[0057] Step 3: Add 0.075g of silicone coupling agent GL-1 and 0.075g of silicone coupling agent WD-80, a...

Embodiment 3

[0063] The high-efficiency selective water shutoff agent for oilfields in this embodiment, the synthetic monomers and the dosage are: 18.0% of acrylamide, 12.0% of acrylic acid, 6.0% of 2-acrylamide-2-methylpropanesulfonic acid, methacryloyloxyethyl Trimethylammonium chloride 3.0%, GL-10.15%, GL-2 0.10%, k 2 S 2 o 8 0.3%, Na 2 SO 3 0.15%.

[0064] The method for preparing the above-mentioned embodiment 3 water blocking agent is as follows:

[0065] Step 1: At room temperature, add 50 mL of deionized water to the three-necked flask, and at the same time pass nitrogen gas to discharge the air in the flask;

[0066] Step 2: Turn on the agitator, add 9.0g acrylamide, 6g acrylic acid and 3g 2-acrylamide-2-methylpropanesulfonic acid, 1.5g methacryloxyethyltrimethylammonium chloride while stirring, and then Stir well to make it fully dissolved;

[0067] Step 3: Add 0.075g of silicone coupling agent GL-1 and 0.05g of silicone coupling agent GL-2, then fully stir to fully diss...

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Abstract

The invention belongs to the technical field of oil-field applied chemistry, and provides an efficient selective water plugging agent for oil fields and a preparation method of the efficient selective water plugging agent for the oil fields. The preparation method comprises the following steps of sequentially adding 18.0 percent to 22.0 percent of nonionic monomers, 10.0 percent to 14.0 percent of anionic monomer 1#, 4.0 percent to 8.0 percent of anionic monomers 2# and 2.0 to 4.0 percent of cationic monomers into a flask containing deionized water under the protection of nitrogen, and stirring sufficiently; adding 0.1 percent to 0.2 percent of crosslinking agent 1# and 0.1 percent to 0.15 percent of crosslinking agent 2#, and stirring sufficiently; adding 0.2 percent to 0.3 percent of oxidizing agent and 0.1 percent to 0.2 percent of reducing agent; reacting at a normal temperature for 30 min to obtain water plugging agent gel; purifying the gel and drying, and grinding the agent into products with different particle sizes according to requirements so as to prepare an expansive organosilicon selective water plugging agent. The water plugging agent prepared according to the method provided by the invention has the advantages of higher water plugging efficiency and lower oil plugging ratio, stability in performance at the normal temperature, strong acid resistance and strong inoxidizability, and the water plugging agent can be prepared into products with different particle sizes according to the size of formation pores. The prepared water plugging agent can be used for plugging water from producing layers during the production process and plugging water during the water injection and profile control process.

Description

technical field [0001] The invention belongs to the technical field of oilfield applied chemistry, and relates to the preparation and application of a water shutoff agent for producing water from production layers during the development of oil and gas fields, and in particular to the plugging of water from different water layers in oil and gas fields, and the plugging of water from oil layers in the late stage of oil and gas field development. Background technique [0002] In the process of oilfield development, the water out of the oil layer will seriously affect the oilfield development work, and even reduce the ultimate recovery rate of the oilfield. After the oil well produces water, firstly determine the water level, and then use the water shutoff method to seal it. The purpose of water plugging is to control the flow of water in the water-producing layer and change the flow direction of water in the water flooding oil, improve the efficiency of water flooding, and try ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/58C08F220/56C08F220/06C08F226/02C08F4/40C09K8/508
Inventor 侯冰罗燕李青洋王力孔鹏
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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