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Three-in-one acidification unblocking agent for oil well unblocking and application method thereof

A three-in-one, plugging agent technology, applied in the direction of chemical instruments and methods, drilling compositions, earthwork drilling and mining, etc., can solve the problems of high strength of on-site liquid mixing, environmental pollution, occupation of construction sites, etc., and achieve rapid acidification The effect of unblocking on-site construction, reducing the risk of environmental pollution, and saving construction costs

Inactive Publication Date: 2018-09-11
扬州润达油田化学剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the acidizing plugging remover commonly used in domestic oilfields consists of three slugs of pre-acid, main acid and post-acid, which need to be configured separately when used in the field. The on-site injection procedure is complicated, and there are several main disadvantages: ①Many slugs , the on-site liquid mixing intensity is high, and there is a certain risk of environmental pollution; ②There are many liquid mixing tanks, which occupy the construction site; ③The construction period is long, the construction is complicated, and the construction cost is high

Method used

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  • Three-in-one acidification unblocking agent for oil well unblocking and application method thereof
  • Three-in-one acidification unblocking agent for oil well unblocking and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A three-in-one acidifying plugging remover for oil well plugging removal, including 250 parts by weight of a mixture of acetic acid and sulfamic acid (the mass ratio between acetic acid and sulfamic acid: 3:4), sodium polyepoxysuccinate And 150 parts by weight of sodium polyacrylate mixture (mass ratio between sodium polyepoxysuccinate and sodium polyacrylate: 2:5), 50 parts by weight of polyquaternium salt, 80 parts by weight of cinnamaldehyde and mercaptobenzothiazole ( The mass ratio between cinnamaldehyde and mercaptobenzothiazole is: 3:2), polyoxyethylene polyoxypropylene stearyl ether and polyoxyethylene-polyoxypropylene block copolymer 30 parts by weight (polyoxyethylene polyoxypropylene The mass ratio between propylene stearyl ether and polyoxyethylene-polyoxypropylene block copolymer is: 1:2), hydrogen fluoride 50 weight parts, fatty acid methyl ester ethoxylate 40 weight parts, ethylene glycol butyl ether 60 parts by weight, 290 parts by weight of clear water;...

no. 2 example

[0042] In this example, the conventional performance index of a three-in-one acidizing plugging remover used for plugging removal of oil wells is explained in detail through laboratory experimental data.

[0043] A three-in-one acidification plugging removal agent for oil well plugging removal of the present invention has the main functions of pre-acid, main acid and post-acid in conventional acidification, its use concentration is 33%, and the dissolution rate of bentonite in 4 hours is 44.8 %, the dissolution rate of sandstone rock powder in 4 hours is 24.3%, and the corrosion rate of N80 coupons at 90°C is 1.05g / (m 2 .h) (industry standard level 1 is ≤5 g / (m 2 .h)), the residual acid surface tension is 26.2mN / m (the industry standard is ≤32 mN / m), the clay stability rate is 85%, the iron ion stability percentage is 81.2%, and the acid slag resistance rate is 99.8%.

no. 3 example

[0045] This example uses laboratory experimental data to describe in detail the core plugging removal laboratory simulation experiment of a three-in-one acidification plugging removal agent for oil well plugging removal.

[0046] Contaminated cores from the well bottom of Wei 2 Oilfield, Jiangsu Oilfield, Sinopec were used. The length of the core is 5.48cm, the diameter of the core is 2.54cm, the porosity is 12.9%, and the permeability of the core is 18.8mD. To simulate the situation of the Wei 2 oil reservoir, at a temperature of 80°C, the core flow experiment device is used to conduct the plugging removal experiment of oil well acidification and plugging removal agent, according to Example 1 Configure the original solution of plugging solution, and the injection method is "3% ammonium chloride solution (to test the initial permeability) → 30% acidified plugging solution → 3% ammonium chloride solution".

[0047] Experimental results such as figure 1 , after injecting the th...

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Abstract

The invention relates to a three-in-one acidification unblocking agent for oil well unblocking and an application method thereof. The acid liquid formula is prepared from the following ingredients inpercentage by weight: 18 to 26 percent of polyorganic acid, 15 to 20 percent of precipitation inhibitors, 5 to 8 percent of iron ion chelating agents, 4 to 7 percent of anti-swelling agents, 6 to 9 percent of corrosion inhibitors, 3 to 6 percent of hydrogen fluoride, 2 to 5 percent of demulsifiers, 3 to 6 percent of acid sludge inhibitors, 3 to 6 percent of water locking prevention agents and thebalance of clean water. During the preparation, all ingredients are added into an anti-corrosion reactor according to the weight parts; the stirring is performed for 40 to 50 minutes at the normal temperature; a finished product is obtained after the uniform dissolution. The main functions of pre-acid, host acid and post-acid in the conventional acidification liquid are integrated; inorganic scales such as mud filtering cake, calcium matters and iron matters and organic scales such as colloid matter and asphalt matter in the stratum can be effectively dissolved; the secondary settlement damageon a reservoir cannot be caused. The three-in-one acidification unblocking agent can also be used as the acidification unblocking agent for pressure reduction and injection increase of an oil field water injection oil.

Description

technical field [0001] The present invention relates to an acidizing plugging removing agent for oil well plugging removal, in particular to an acidizing plugging removing agent which integrates the main functions of pre-acid, main acid and post-acid in conventional acidizing liquid, and its Preparation and application. Background technique [0002] Oil well oil layer pollution is the most common production problem commonly encountered in new and old oil fields. The direct consequence of oil layer pollution will reduce the fluid production of oil wells, and in severe cases it will cause oil wells to stop production, resulting in huge economic losses. Oil layer pollution is the production process of oil fields. Inevitably, acidizing plugging removal is the most commonly used economical and effective method to decontaminate oil reservoirs at home and abroad, and it has been developed for nearly a hundred years. At present, the acidizing plugging remover commonly used in domes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528C09K8/74C09K8/58E21B43/22
CPCC09K8/524C09K8/528C09K8/58C09K8/74C09K2208/12C09K2208/32E21B43/16
Inventor 邓建华王玉生马惠朱红兵肖超国
Owner 扬州润达油田化学剂有限公司
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