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Foam cyclic utilization method by utilizing low carbon alcohol to realize foam drilling

A low-carbon alcohol and foam technology, applied in the field of foam drilling, can solve problems such as the decline of foam performance, achieve fast defoaming speed, reduce costs, and achieve the effects of environmental friendliness

Inactive Publication Date: 2010-10-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is selective to the foaming agent and is limited to the amphoteric foaming agent; it is necessary to repeatedly add acid and alkali to adjust the pH value of the base liquid during the cycle; and as the number of cycles increases, the foam performance gradually decreases

Method used

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  • Foam cyclic utilization method by utilizing low carbon alcohol to realize foam drilling
  • Foam cyclic utilization method by utilizing low carbon alcohol to realize foam drilling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Pre-prepared 82L of foam base liquid in foam base liquid tank 1. Calculated by mass percentage, the formula of foam base liquid is: 0.8% K12, 0.2% XC, 0.1% HV-CMC, and the rest is tap water. Adjust the gas flow rate to 1.6m 3 / min, the liquid flow rate is 20L / min, and now the gas-liquid ratio is 80, 4.5L isoamyl alcohol is added in the defoamer storage tank 25, isoamyl alcohol is evenly sprayed on the foam with the flow rate of 0.12L / min, At the same time, the stirrer was turned on at a speed of 300 r / min. The defoamed foam liquid enters the buffer tank 29 and the base liquid tank 1 to realize the recycling of the foam.

[0027] The newly added isoamyl alcohol in each cycle is 0.6% of the volume of the foam base liquid. In order to facilitate the observation and monitoring of the foam performance after each defoaming, the foam base liquid after defoaming in the buffer tank is pumped through the centrifugal pump every 4 minutes. The foam base liquid tank was sampled fr...

Embodiment 2

[0032] Pre-prepared 100L foam base liquid in the foam base liquid tank. Calculated by mass percentage concentration, the formula of foam base liquid is: 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the rest is tap water. Adjust the gas flow rate to 1.5m 3 / min, the liquid flow rate is 21.1L / min, and the gas-liquid ratio is 71.1. 6.5L of n-butanol was added to the defoamer storage tank, and the n-butanol was evenly sprayed onto the foam at a flow rate of 0.19L / min, and at the same time, the stirrer was turned on at a speed of 250r / min. The defoamed foam liquid enters the buffer tank and the base liquid storage tank to realize the recycling of the foam.

[0033] The newly added n-butanol in each cycle is 0.9% of the volume of the foam base liquid. In order to facilitate the observation and monitoring of the foam performance after each defoaming, the defoamed foam base liquid in the buffer tank is pumped by a centrifugal pump every 4.5 minutes. To the foam base liquid tank, at the same ...

Embodiment 3

[0039] Pre-prepared 95L of foam base liquid in the foam base liquid tank. Calculated by mass percentage concentration, the formula of foam base liquid is: 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the rest is tap water. Adjust the gas flow rate to 1.5m 3 / min, the liquid flow rate is 19.7L / min, and the gas-liquid ratio is 76.1. Add 6.5L mixture of n-amyl alcohol and tributyl phosphate to the defoamer storage tank, the volume ratio of the two is 1:5, uniformly mix the mixture of n-amyl alcohol and tributyl phosphate at a flow rate of 0.16L / min Spray onto the foam while turning on the stirrer at a speed of 250r / min. The defoamed foam liquid enters the buffer tank and the base liquid storage tank in turn, so as to realize the recycling of the foam.

[0040] The mixture of n-amyl alcohol and tributyl phosphate newly added in each cycle is 0.81% of the volume of the foam base liquid. For the convenience of observing and monitoring the foam performance after each defoaming, the defoamin...

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Abstract

The invention discloses a foam cyclic utilization method by utilizing low carbon alcohol to realize foam drilling. Foam returned from wellhead after mineshaft circulation is added with low carbon alcohol for defoaming, foam liquid after defoaming is foamed and then is reused in the well, thus realizing cyclic utilization of foam. The added defoaming agent includes at least low carbon alcohol the structural formula of which is R-OH, wherein R is alkyl containing four carbon atoms or five atoms; and the low carbon alcohol has both foaming and defoaming functions. By adopting the method for realizing foam circulation, only low carbon alcohol is required to be added for defoaming, base fluid after defoaming can be foamed again and then be reused in the well; if low carbon alcohol volume content in foam base fluid after a plurality of times of circulation accounts for more than 5% of foam base fluid volume, the low carbon alcohol is removed, then foaming agent is added for foaming, thus realizing the cyclic utilization of foam base fluid; the removed low carbon alcohol can be reused, the low carbon alcohol has no selectivity to the foaming agent, and defoaming speed is rapid, and foam drilling cost can be reduced, thus being environmentally friendly.

Description

technical field [0001] The invention relates to the field of foam drilling, in particular to a foam recycling method for realizing foam drilling by using low-carbon alcohol. Background technique [0002] Foam drilling technology began in the 1950s, domestic research and application began in the 1980s, and field practice has been successively obtained in Xinjiang, Shengli, Liaohe, Daqing, Changqing, Sichuan and other oil fields. At present, the non-recycling foam drilling technology has problems such as a large amount of foam used at one time, and the returned foam is easy to pollute the environment, which not only increases the cost of foam drilling, but also is not conducive to environmental protection. [0003] The foam circulation referred to in the drilling industry refers to the continuous process of defoaming the foam returned to the wellhead through physical, mechanical or chemical methods, adjusting its performance and reusing it for drilling, so as to realize the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/14
CPCE21B21/14E21B21/01C09K8/38
Inventor 孟英峰万里平李永杰李皋唐洪明赵峰
Owner SOUTHWEST PETROLEUM UNIV
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