Recyclable foam base fluid for sand-washing well

A foam and base fluid technology, applied in the field of recyclable foam base fluid, can solve the problems of large amount of waste, unfavorable environmental protection, increase the cost of foam sand flushing and well cleaning, etc., and achieve the effect of reducing operating costs

Inactive Publication Date: 2011-04-27
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing foam sand washing process generally does not realize the recycling and reuse of the foam base fluid. There are problems such as a large waste of foam for one-time use, and the returned foam is easy to pollute the environment. This not only increases the cost of foam sand washing and well washing, but also does not Conducive to environmental protection

Method used

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  • Recyclable foam base fluid for sand-washing well
  • Recyclable foam base fluid for sand-washing well
  • Recyclable foam base fluid for sand-washing well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1, the preparation of recyclable foam base fluid and its cycle performance test

[0027] Prepare 100L recyclable foam base liquid, calculated in parts by mass, the composition of the foam base liquid is: 0.5 part C 12 h 25 NHCH 2 CH 2 COONa, 0.05 part C 14 h 29 O(CH 2 CH 2 O) 2 SO 3 Na, 0.05 part C 12 h 25 N(CH 3 ) 2 O, 0.2 parts of C 10 h 21 COONa, 0.1 part xanthan gum (relative molecular weight is 1×10 6 g / mol, the aqueous solution viscosity of 1% xanthan gum at 25°C is 1200mpa.s-1700mpa.s), 0.1 parts of CMC (relative molecular weight is 6×10 3 g / mol, the viscosity of 1% CMC aqueous solution at 25°C is 1500mpa.s-3000mpa.s), and the rest is tap water.

[0028] The circulation performance test of the foam base fluid with the above composition was carried out by using the above circulation device, and the foam quality and half-life were tested by a Waring mixer.

[0029] In order to facilitate the observation and monitoring of the performance ...

Embodiment 2

[0032] Embodiment 2, the preparation of recyclable foam base fluid and its cycle performance test

[0033] Prepare 130L recyclable foam base liquid, calculated in parts by mass, the formula of foam base liquid is: 0.4 part C 14 h 29 NHCH 2 CH 2 COONa, 0.05 part C 12 h 25 O(CH 2 CH 2 O) 2 SO 3 Na, 0.1 part C 14 h 29 N(CH 3 ) 2 O, 0.1 parts of C 17 h 35 COONa, 0.2 parts xanthan gum (relative molecular weight is 2×10 7 g / mol, the aqueous solution viscosity of 1% xanthan gum at 25°C is 1200mpa.s-1700mpa.s), 0.2 parts of CMC (relative molecular weight is 2×10 4 g / mol, the viscosity of 1% CMC aqueous solution at 25°C is 1500mpa.s-3000mpa.s), and the rest is tap water.

[0034] The circulation performance test of the foam base fluid with the above composition was carried out by using the above circulation device, and the foam quality and half-life were tested by a Waring mixer.

[0035] In order to facilitate the observation and monitoring of the performance of the f...

Embodiment 3

[0038] Embodiment 3, the preparation of recyclable foam base fluid and its cycle performance test

[0039] Prepare 120L recyclable foam base liquid, calculated in parts by mass, the formula of foam base liquid is: 0.5 part C 12 h 25 NHCH 2 CH 2 COONa, the rest is tap water.

[0040] The circulation performance test of the foam base fluid with the above composition was carried out by using the above circulation device, and the foam quality and half-life were tested by a Waring mixer.

[0041] In order to facilitate the observation and monitoring of the performance of the foam after each cycle, the foam base liquid after the defoaming was started for the next cycle every 2.5 minutes; at the same time, samples were taken, and the foam quality and half-life were tested with a Waring mixer. The monitoring results are shown in Table 3 Show. It can be seen from Table 3 that after 5 cycles of the foam base liquid, the foaming volume and half-life decrease slightly, but the quartz...

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Abstract

The invention provides a recyclable foam base fluid for a sand-washing well, comprising an N-alkyl-beta-amino propionic acid type amphoteric surface active agent and water, wherein the molecular formula of the N-alkyl-beta-amino propionic acid type amphoteric surface active agent is RNHCH2CH2COOM, wherein R is straight-chain alkyl group, and M is sodium ion or ammonium ion; and the ratio of partsby weight of the N-alkyl-beta-amino propionic acid type amphoteric surface active agent and water is (0.1-0.6):100. By utilizing the recyclable foam base fluid, the operation cost for foam sand-washing well can be reduced, and the environment-friendly performance can be realized.

Description

technical field [0001] The invention relates to a recyclable foam base fluid in the field of petroleum exploitation, in particular to a recyclable foam base fluid used for sand flushing and well washing. Background technique [0002] Sand flushing is a measure commonly adopted by major oilfields to solve the problem of sand settling in wells. The commonly used sand flushing media are mainly clear water (including seawater) and foam. Since the foam fluid has the advantages of low density, high viscosity, low fluid loss, and strong sand-carrying ability, and the pressure of the oil layer decreases a lot with the long-term exploitation of the oil field, foam is often used as the sand washing medium in this case. Since the 1980s, my country has successively carried out foam sand flushing technology in oil fields such as Changqing, Xinjiang, Dagang, Shengli, and Bohai Sea, which solved the problem of sand flushing of oil wells with serious leakage in low-pressure formations and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/536
Inventor 张凤久司念亭万里平李玉光赵峰靳勇王珊邢希金
Owner CHINA NAT OFFSHORE OIL CORP
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