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Protective solution for low pressure oil-well operations

A technology for protecting fluids and oil wells, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of reduced production time and service life of operating wells, long flowback time of oil and water wells, and reduced well production, achieving Simple on-site implementation, low formation damage, and the effect of restoring production capacity

Active Publication Date: 2014-01-15
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reinjection water after oilfield treatment is often used on site. Since the reinjection water is the produced water collected from each fault block, the composition is complex, and when it is lost into the formation, it will directly contact with the rock and undergo physical and chemical changes. The on-site performance is that the flowback time of oil and water wells is long , and even the production of some wells has been greatly reduced, and it is difficult to restore to the original level, which reduces the production time rate and service life of the operating wells

Method used

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  • Protective solution for low pressure oil-well operations
  • Protective solution for low pressure oil-well operations
  • Protective solution for low pressure oil-well operations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1. Preparation of leakage reducing agent A:

[0032] The leakage reducing agent A is mixed according to the following proportions: high-molecular polyacrylamide with a molecular weight of 18 million, 50% by mass; low-molecular polyacrylamide with a molecular weight of 6 million, 30% by mass; acrylamide monomer, The mass percentage is 20%, put into the reaction kettle and stir for 10 minutes to make the leakage reducing agent A.

[0033] 2. Preparation of leakage reducing agent B:

[0034]1. Preparation of organic chromium intermediate YJG: Add 50% by mass of fructose and 30% of water into the reaction kettle, heat to 80°C with stirring, slowly pour 10% by mass of chromium hydroxide into the reaction vessel Kettle, open the reaction for 1h. Then slowly add potassium carbonate with a mass percentage of 10%, continue to react for 20 minutes, drop to room temperature and discharge and filter, pour the obtained filtrate into anhydrous ethanol solution and stir, and then th...

Embodiment 2

[0048] 1. Preparation of leakage reducing agent A:

[0049] The leakage reducing agent A is mixed according to the following proportions: high-molecular polyacrylamide with a molecular weight of 18 million, 60% by mass; low-molecular polyacrylamide with a molecular weight of 6 million, 20% by mass; acrylamide monomer, The mass percentage is 20%, and the preparation method is the same as in Example 1.

[0050] 2. Preparation of leakage reducing agent B:

[0051] 1. Preparation of organic chromium intermediate YJG: the mass percent of raw materials is 45% fructose, 35% water, 8% chromium hydroxide, and 12% potassium carbonate.

[0052] 2, prepare resin intermediate SZT, the mass percentage of raw material is 25% urea, 58% formaldehyde solution, and described formaldehyde solution concentration is 37%, 5 drops of 2mol / L sodium hydroxide, 5 drops of glacial acetic acid, 16.5 % furfuryl alcohol, 0.5% triethanolamine.

[0053] 3. Preparation of leakage reducing agent B: 40% organ...

Embodiment 3

[0066] 1. Preparation of leakage reducing agent A:

[0067] The leakage reducing agent A is mixed according to the following proportions: high-molecular polyacrylamide with a molecular weight of 18 million, 55% by mass; low-molecular polyacrylamide with a molecular weight of 6 million, 30% by mass; acrylamide monomer, The mass percentage is 15%, and the preparation method is the same as in Example 1.

[0068] 2. Preparation of leakage reducing agent B:

[0069] 1. Preparation of organic chromium intermediate YJG: the mass percentage of raw materials is 55% fructose, 20% water, 12% chromium hydroxide, and 13% potassium carbonate.

[0070] 2, prepare resin intermediate SZT, the mass percentage of raw material is 28% urea, 60% formaldehyde solution, and described formaldehyde solution concentration is 37%, 5 drops of 2mol / L sodium hydroxide, 5 drops of glacial acetic acid, 11.6 % furfuryl alcohol, 0.4% triethanolamine.

[0071] 3. Preparation of leakage reducing agent B: 50% o...

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Abstract

The invention discloses a protective solution for operations of oil-wells in oil fields with maintaining pressure at low levels. The protective solution comprises 0.3-0.5 wt% of leakage reducing agent A, 0.3-0.5 wt% of leakage reducing agent B, 0.2-0.5 wt% of capsule gel breaker, 0.5-1.0 wt% of discharge aiding agent HB-11, and the balance of water, wherein the summation of the mass percents of all the ingredients is 100 wt%. According to the invention, by synthesis of the intermediate and cross-linking reaction of polyacrylamide, a gel capable of effectively increasing the resistance to liquid flow is formed; the leakage of well killing fluid is reduced; the capsule gel breaker is utilized to break the gel at regular time to remove the block; and the discharge aiding agent in the system is beneficial for the flowback of the leakage reducing agents and gel breaking liquid, thus the purpose of rapidly recovering capacity is achieved.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a protective fluid for oil well operations with low oil layer maintenance pressure. oil well operations. Background technique [0002] With the increasing emphasis on oil layer protection technology, oil layer damage in the process of drilling and completion has been curbed to a certain extent, and the damage to the formation in the operation link has become more and more obvious. When this type of oil well is being operated and constructed, it is often necessary to carry out well killing construction. On the one hand, it is to ensure the safety during the operation and prevent blowout or blowout caused by a certain pressure in the pipe string. On the other hand, it is to clean the oil on the pipe string. , Keep the construction site clean and tidy. However, due to the low formation pressure coefficient, once the hydrostatic injection pressure of the well-kill...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C08G12/12
Inventor 张伟巨登峰高孟祥苏娜李翠琴谢娟
Owner PETROCHINA CO LTD
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