WO2012010061A1 - Method for circulatory use of foam in foam drilling by means of low-carbon alcohol - Google Patents

Method for circulatory use of foam in foam drilling by means of low-carbon alcohol Download PDF

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Publication number
WO2012010061A1
WO2012010061A1 PCT/CN2011/077126 CN2011077126W WO2012010061A1 WO 2012010061 A1 WO2012010061 A1 WO 2012010061A1 CN 2011077126 W CN2011077126 W CN 2011077126W WO 2012010061 A1 WO2012010061 A1 WO 2012010061A1
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foam
alcohol
low
base liquid
volume
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PCT/CN2011/077126
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French (fr)
Chinese (zh)
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孟英峰
万里平
李永杰
李皋
唐洪明
赵峰
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西南石油大学
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/02—Well-drilling compositions
    • C09K8/38—Gaseous or foamed well-drilling compositions
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/14—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor using liquids and gases, e.g. foams

Definitions

  • the present invention relates to the field of foam drilling, and more particularly to a foam recycling process for foam drilling using lower alcohols.
  • Foam drilling technology began in the 1950s. Domestic research and application began in the 1980s, and field practice has been achieved in Xinjiang, Shengli, Liaohe, Daqing, Changqing, Sichuan and other oil fields. At present, non-recyclable foam drilling technology has the problems of large amount of foam used in one time, and the bubble that is returned to pollute the environment, which not only increases the cost of foam drilling, but also is not conducive to environmental protection.
  • the foam cycle referred to by the drilling industry is to defoam the foam returning to the wellhead by physical, mechanical or chemical means, adjust its performance and reuse it in the continuous process of drilling, thereby achieving foaming-foaming-recurring of the foam. Repeated cycles of bubbles.
  • the physical defoaming method has not been applied in the oil drilling industry on the spot due to operational difficulties.
  • the mechanical defoaming cycle foam method requires not only additional equipment but also a low defoaming rate.
  • the chemical defoaming cycle foaming method generally uses an amphoteric surfactant as a foaming agent, and utilizes an amphoteric surfactant to be sensitive to acid and alkali by adjusting the base liquid.
  • the pH value achieves recycling of the foam.
  • the method has selectivity for the foaming agent and is limited to the amphoteric blowing agent; the acid and alkali adjusting base liquid pH is repeatedly added during the circulation. Value; and as the number of cycles increases, the foam performance gradually decreases.
  • the alcohols used in the petroleum industry are generally used as a defoaming agent at one time, or as a foam stabilizer alone, and the two are generally not the same alcoholic substance, and the mechanism and process are different.
  • the alcohol when used as a defoaming agent, it mainly acts on the surface of the foam. Because it spreads rapidly on the surface of the foam and contacts the liquid film of the bubble, reducing the local surface tension of the foam can cause the foam to burst rapidly.
  • the alcohol is used as a foam stabilizer, it mainly acts on the foam base liquid, and the low-carbon alcohol is dissolved in the foam base liquid, which can enhance the surface viscosity of the solution and increase the strength of the foam liquid film. If a low-carbon alcohol with both defoaming and foam stabilization is found and combined with the foam drilling process, the recycling of the drilling foam can be achieved.
  • the technical problem to be solved by the present invention is that, in view of the above situation, an alcohol substance having both defoaming and foam stabilization functions is found, and combined with the foam drilling process, the recycling of the drilling foam is realized.
  • the inventors have found that certain lower alcohols have the characteristics of strong defoaming and weak foam inhibition, that is, the same lower alcohol can be used not only as a defoaming agent, but also has the ability to stabilize foam, and only needs to be used as a foam base liquid.
  • the recycling of the foam can be achieved by adding such a lower alcohol. Adding a small amount of lower alcohol to the foamed foam system, the low-carbon alcohol rapidly spreads on the surface of the foam and contacts the bubble liquid film, reducing the local surface tension of the foam, causing the foam to burst rapidly; in the solubility range, the surface of the foam is eliminated.
  • a foam recycling method for foam drilling using low-carbon alcohol the foam returned from the wellhead after circulating through the wellbore is added with a lower alcohol to defoam, and the foamed liquid after defoaming is foamed and used again into the well. Recycling the foam, the added antifoaming agent includes at least one structural formula R-OH and R are lower alcohols having a hydrocarbon group of 4 carbon atoms or 5 carbon atoms.
  • the lower alcohol is one or more of n-butanol, isobutanol, n-pentanol, isoamyl alcohol, and neopentyl alcohol.
  • the antifoaming agent further comprises tributyl phosphate.
  • the volume ratio of the lower alcohol to the tributyl phosphate is from 1:5 to 5:1.
  • the newly added alcohol defoamer is 0.6-0.9% by volume of the foam base liquid per cycle. If the volume of the lower alcohol in the foam base liquid exceeds 5% by volume of the foam base liquid after repeated cycles, the lower alcohol is removed.
  • the low-carbon alcohol of the invention has no selectivity to the foaming agent and has a fast defoaming speed, and is suitable for the commonly used foaming agent in oil fields, such as sodium dodecylbenzenesulfonate (ABS). ), sodium lauryl sulfate (K12), dodecyl polyoxyethylene ether (AEO), fatty alcohol ether sulfate (AES).
  • ABS sodium dodecylbenzenesulfonate
  • K12 sodium lauryl sulfate
  • AEO dodecyl polyoxyethylene ether
  • AES fatty alcohol ether sulfate
  • additives may be added according to actual drilling needs, such as foam stabilizers, well wall stabilizers, preservatives, and the like.
  • the lower alcohols, the foaming agents for foaming, and the additives added as needed according to the present invention are all commercially available organic compounds produced by chemical plants.
  • the beneficial effects of the invention 1
  • the foaming cycle is carried out by using the method, only the alcohol defoaming agent is added, and the pH of the base liquid is not required to be added during the circulation. Value, alcohol defoamer can be reused; 2 alcohol defoamer is not selective to the foaming agent, and the defoaming speed is fast; 3 if the volume of the lower alcohol in the foam base liquid after multiple cycles 5% of the volume of the foam base In the above, the low-carbon alcohol is removed to achieve multiple recycling of the foam base liquid; 4, the foam drilling cost can be reduced, and the environment is friendly.
  • Figure 1 is a diagram of a foam circulation device used in an indoor experiment.
  • K1 2 is sodium lauryl sulfate
  • ABS is sodium dodecylbenzene sulfonate
  • XC is biopolymer
  • HV-CMC It is a highly viscous carboxymethyl cellulose.
  • the foam circulation device used in the laboratory experiments is shown in Fig. 1.
  • the experimental process is as follows:
  • a certain concentration of foam base liquid is pre-formulated in the foam base tank 1.
  • the foam base liquid enters the pore type foam generator 11 by the shut-off valve 2, the centrifugal pump 3, the orifice flow meter 4, and the air is passed through the air compressor 5, and the air is stored.
  • the tank 7, the shut-off valve 8, the rotor flow meter 9, and the shut-off valve 10 enter the pore type foam generator 11, and the vent valve 6 on the air tank 7 is used to adjust the pressure balance and stability of the gas tank.
  • the foam properties generated in the pore foam generator can be changed.
  • the foam flowing out of the pressure gauge 12 and the shutoff valve 13 at the outlet end of the bubble type foam generator 11 enters the foam observation tube 14.
  • the foam flowing out of the shutoff valve 15 at the bottom end of the foam observation tube 14 enters the defoaming chamber 21 via the bubble sampler 16, the pressure gauge 17, and the shutoff valve 18.
  • the shutoff valve 23 and the pressure gauge 22 enter the spray pipe 19, and the defoaming agent is evenly sprayed onto the foam through the spray pipe 19 to achieve the purpose of rapid defoaming, and the stirrer 20 is turned on while defoaming.
  • the bubbled liquid enters the buffer tank 29 from the bottom of the defoaming chamber 21 via the shutoff valve 26, the centrifugal pump 27, and the shutoff valve 28.
  • a sampling port 30 is installed at the bottom of the buffer tank 29.
  • the foam base liquid in the buffer tank 29 is returned to the foam base tank 1 via the shutoff valve 31, the centrifugal pump 32, and the shutoff valve 33, thereby achieving recycling of the foam.
  • the foam base tank 1 82 L of foam base liquid was prepared in advance, and the foam base liquid formula was 0.8% K12, 0.2% XC, 0.1% HV-CMC, and the balance was tap water.
  • the gas flow rate was adjusted to 1.6 m 3 /min, the liquid flow rate was 20 L / min, and the gas-liquid ratio was 80.
  • the defoamer storage tank 25 was added with 4.5 L of isoamyl alcohol, and the isoprene was flowed at a flow rate of 0.12 L /min.
  • the alcohol was evenly sprayed onto the foam while the stirrer was turned on at 300 r/min.
  • the defoamed foam liquid enters the buffer tank 29 and the base liquid tank 1 to realize recycling of the foam.
  • the newly added isoamyl alcohol per cycle is 0.6% of the volume of the foam base solution.
  • each interval 4min The foam base liquid in the buffer tank was defoamed to the foam base tank through a centrifugal pump, and the bottom of the buffer tank was sampled.
  • the foam quality and half-life were tested by a Waring blender.
  • Table 1 It can be seen that after 9 cycles of the foam base liquid, the foaming volume and half-life have decreased more. At this time, the volume of isoamyl alcohol entering the base tank is 4.32L, and the total volume of the foam base liquid is 86.32L.
  • the volume of isoamyl alcohol accounts for 5% of the total volume of the foam base liquid, and the isoamyl alcohol needs to be removed, and the removed isoamyl alcohol is recycled into the defoaming agent addition tank, and 65.6 g of K12 foam is added to the base liquid tank.
  • Agent K12 After the addition amount is 10% of the amount of the base liquid, the foam base liquid can be re-foamed, the foam performance reaches the initial foaming performance, and a new foam cycle is performed, thereby achieving multiple recycling of the foam.
  • the foam base liquid formula is: 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the rest is tap water.
  • the gas flow rate was adjusted to 1.5 m 3 /min and the liquid flow rate was 21.1 L / min.
  • the gas-liquid ratio was 71.1.
  • 6.5 L of n-butanol was added to the defoamer tank, and n-butanol was evenly sprayed onto the foam at a flow rate of 0.19 L /min while the stirrer was turned on at 250 r/min.
  • the defoamed foam liquid enters the buffer tank and the base liquid storage tank to realize the recycling of the foam.
  • the newly added n-butanol per cycle is 0.9% of the volume of the foam base.
  • each interval 4.5min.
  • the foam base liquid after defoaming in the buffer tank is pumped to the foam base tank through the centrifugal pump, and is sampled from the bottom of the buffer tank.
  • the agitator was used to test the foam quality and half-life.
  • the monitoring results are shown in Table 2. It can be seen from Table 2 that the foaming volume and half-life of the foam base liquid have decreased more after 7 cycles, which indicates that the n-butanol used in the present invention can be used in the foam cycle, and the first seven times are not required to be supplemented with new ones.
  • Foaming agent
  • the volume of n-butanol entering the base tank is 5.98L, and the total volume of the foam base liquid is 105.98L. At this time, the volume of n-butanol is 5.6% of the total volume of the foam base liquid.
  • the n-butanol is removed, and the removed n-butanol is recycled into the defoaming agent addition tank, and 60 g is added to the base tank. After the ABS blowing agent, the foam base liquid can be re-foamed to perform a new foam cycle, thereby achieving multiple recycling of the foam.
  • foam base liquid was pre-formulated in the foam base tank.
  • the foam base liquid formula was: 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the rest was tap water.
  • the gas flow rate was adjusted to 1.5 m 3 /min, and the liquid flow rate was 19.7 L/min, at which time the gas-liquid ratio was 76.1.
  • a mixture of 6.5 L of n-pentanol and tributyl phosphate was added to the defoamer tank, and the volume ratio of the two was 1:5, and the mixture of n-pentanol and tributyl phosphate was uniformly distributed at a flow rate of 0.16 L/min. Spray onto the foam while turning on the stirrer at 250 r/min. The defoamed foam liquid enters the buffer tank and the base liquid storage tank in order to realize the recycling of the foam.
  • the newly added mixture of n-pentanol and tributyl phosphate per cycle is 0.81% of the volume of the foam base solution.
  • the foam base liquid in the buffer tank was defoamed by a centrifugal pump to the foam base tank at intervals of 4.5 min, while sampling from the bottom of the buffer tank, using Waring The agitator was used to test the foam quality and half-life. The monitoring results are shown in Table 3.
  • the volume of the mixture of n-pentanol and tributyl phosphate entering the base tank is 5.76L, and the total volume of the foam base liquid is 100.76L.
  • n-pentanol and tributyl phosphate are used.
  • the volume of the mixture is 5.7% of the total volume of the foam base liquid.
  • the mixture of n-pentanol and tributyl phosphate is removed, and the mixture of n-pentanol and tributyl phosphate removed is recycled into the defoaming agent tank. Add 57g to the tank After the ABS blowing agent, the foam base liquid can be re-foamed, thereby achieving multiple recycling of the foam.
  • a 90 L foam base liquid was preliminarily prepared in a foam base tank, and the foam base liquid formula was 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the balance was tap water.
  • the gas flow rate was adjusted to 1.5 m 3 /min and the liquid flow rate was 19.5 L/min, at which time the gas-liquid ratio was 76.9.
  • a mixture of 70 L of isobutanol and tributyl phosphate was added to the defoamer tank, and the volume ratio of the two was 5:1, and the mixture of isobutanol and tributyl phosphate was uniformly sprayed at a flow rate of 0.17 L/min.
  • On the foam turn on the stirrer at 250 r/min.
  • the defoamed foam liquid enters the buffer tank and the base liquid storage tank in order to realize the recycling of the foam.
  • the mixture of isobutanol and tributyl phosphate added in each cycle is 0.87% of the volume of the foam base.
  • the foam base liquid in the buffer tank was defoamed by a centrifugal pump to the foam base tank at intervals of 4.5 min, while sampling from the bottom of the buffer tank, using Waring The agitator was used to test the foam quality and half-life.
  • the monitoring results are shown in Table 4. It can be seen from Table 4 that the foaming volume and the half-life of the foam base liquid have decreased more after 9 cycles, which indicates that the mixture of isobutanol and tributyl phosphate used in the present invention can be used for the foam cycle. No new blowing agent is needed for 9 times.
  • the volume of the mixture of isobutanol and tributyl phosphate entering the base tank was 6.9 L, and the total volume of the foam base liquid was 96.9 L.
  • isobutanol and tributyl phosphate were used.
  • the volume content of the mixture is 7.1% of the total volume of the foam base liquid.
  • the mixture of isobutanol and tributyl phosphate is removed, and the removed lower alcohol is recycled into the defoamer addition tank, and 54g is added to the base tank. After the ABS blowing agent, the foam base liquid can be re-foamed, thereby achieving multiple recycling of the foam.
  • the foam base solution was: 0.8% K12, 0.2% XC, 0.2% HV-CMC, and the rest was tap water.
  • the gas flow rate was adjusted to 1.6 m 3 /min, the liquid flow rate was 21.3 L / min, and the gas-liquid ratio was 75.1.
  • the defoamer storage tank was filled with 5.5 L of neopentyl alcohol, and the flow rate was 0.16 L /min. The alcohol was evenly sprayed onto the foam while the stirrer was turned on at 300 r/min. The defoamed foam liquid enters the buffer tank and the base liquid tank to realize the recycling of the foam.
  • the newly added neopentyl alcohol per cycle is 0.75% of the volume of the foam base.
  • the foam base liquid in the buffer tank is defoamed by a centrifugal pump every 4 minutes.
  • the foam-based liquid tank was sampled from the bottom of the buffer tank, and the foam quality and half-life were tested with a Waring blender. The monitoring results are shown in Table 5. It can be seen from Table 5 that after 8 cycles of the foam base liquid, the foaming volume and half-life have decreased more.
  • the volume of neopentyl alcohol entering the base liquid tank is 5.12 L
  • the total volume of the foam base liquid is 95.12L
  • the volume of neopentyl alcohol accounts for 5.4% of the total volume of the foam base liquid.
  • the neopentyl alcohol needs to be removed, and the removed neopentyl alcohol enters the defoaming agent addition tank for recycling, and 72gK12 foam is added to the base liquid tank. After the agent, the foam base liquid can be re-foamed, the foam performance reaches the initial foaming performance, and a new foam cycle is performed, thereby achieving multiple recycling of the foam.

Abstract

A method for circulatory use of foam in foam drilling by means of low-carbon alcohol. The method comprises the following steps: adding a low-carbon alcohol to foam reemerging from a well at the opening for defoaming; foaming the defoamed foam liquid to be injected to the well for reuse, thereby achieving a circulatory use of foam. A defoaming agent comprises at least a low-carbon alcohol having a structure of R—OH, wherein R is an alkyl group having four or five carbon atoms. The low-carbon alcohol has both defoaming and foam stabilizing effects. Employment of the method for foam circulation requires only the addition of the low-carbon alcohol for defoaming. The defoamed base liquid can be refoamed and be injected into the well for reuse. After multiple cycles, when the low-carbon alcohol accounts for 5% by volume of the foam base liquid, the low-carbon alcohol can be removed, then a foaming agent can be added for foaming, thus achieving multiple circulatory reuses of the foam base liquid, while the low-carbon alcohol can also be reused. The low-carbon alcohol is nonselective towards foaming agents, and has a rapid defoaming speed, the ability to reduce costs of foam drilling, and environmental friendliness.

Description

利用低碳醇实现泡沫钻井的泡沫循环利用方法  Foam recycling method for foam drilling using low alcohol 利用低碳醇实现泡沫钻井的泡沫循环利用方法  Foam recycling method for foam drilling using low alcohol
技术领域 Technical field
本发明涉及泡沫钻井领域，尤其是一种利用低碳醇实现泡沫钻井的泡沫循环利用方法。 The present invention relates to the field of foam drilling, and more particularly to a foam recycling process for foam drilling using lower alcohols.
背景技术 Background technique
泡沫钻井技术始于20世纪50年代，国内在80年代开始研究和应用，并相继在新疆、胜利、辽河、大庆、长庆、四川等油田取得现场实践。目前，非循环使用的泡沫钻井技术存在泡沫一次性使用量大、返出的泡沫易污染环境等问题，不仅增加泡沫钻井成本，而且不利于环境保护。 Foam drilling technology began in the 1950s. Domestic research and application began in the 1980s, and field practice has been achieved in Xinjiang, Shengli, Liaohe, Daqing, Changqing, Sichuan and other oil fields. At present, non-recyclable foam drilling technology has the problems of large amount of foam used in one time, and the bubble that is returned to pollute the environment, which not only increases the cost of foam drilling, but also is not conducive to environmental protection.
钻井行业所指的泡沫循环即通过物理、机械或化学等方式将返出井口的泡沫消泡后，调节其性能并再次用于钻井的连续过程，从而实现泡沫的发泡-消泡-再发泡的反复循环。物理消泡法由于操作困难，目前还没有在石油钻井行业现场应用。机械消泡循环泡沫法不仅需要附加设备，而且消泡率不高。化学消泡循环泡沫法一般是采用两性表面活性剂作发泡剂，利用两性表面活性剂对酸碱的敏感，通过调节基液 pH 值实现泡沫的循环利用。该方法对发泡剂具有选择性，仅限于两性发泡剂；在循环过程中需反复添加酸碱调节基液 pH 值；而且随着循环次数的增多，泡沫性能逐渐下降。 The foam cycle referred to by the drilling industry is to defoam the foam returning to the wellhead by physical, mechanical or chemical means, adjust its performance and reuse it in the continuous process of drilling, thereby achieving foaming-foaming-recurring of the foam. Repeated cycles of bubbles. The physical defoaming method has not been applied in the oil drilling industry on the spot due to operational difficulties. The mechanical defoaming cycle foam method requires not only additional equipment but also a low defoaming rate. The chemical defoaming cycle foaming method generally uses an amphoteric surfactant as a foaming agent, and utilizes an amphoteric surfactant to be sensitive to acid and alkali by adjusting the base liquid. The pH value achieves recycling of the foam. The method has selectivity for the foaming agent and is limited to the amphoteric blowing agent; the acid and alkali adjusting base liquid pH is repeatedly added during the circulation. Value; and as the number of cycles increases, the foam performance gradually decreases.
目前石油行业中使用的醇类一般是作为消泡剂一次性使用，或者是作为稳泡剂单独使用，二者一般不为同一种醇类物质，且作用机理和过程不同。醇类作消泡剂时，主要是作用于泡沫表面，由于其在泡沫表面快速铺展并与气泡液膜接触，降低泡沫局部表面张力，可导致泡沫迅速破灭。醇类作稳泡剂时，主要是作用于泡沫基液，低碳醇溶于泡沫基液中，能增强溶液表面粘度和提高泡沫液膜强度。若找到一种兼具有消泡和稳泡作用的低碳醇，并与泡沫钻井工艺相结合，可实现钻井泡沫的循环利用。 At present, the alcohols used in the petroleum industry are generally used as a defoaming agent at one time, or as a foam stabilizer alone, and the two are generally not the same alcoholic substance, and the mechanism and process are different. When the alcohol is used as a defoaming agent, it mainly acts on the surface of the foam. Because it spreads rapidly on the surface of the foam and contacts the liquid film of the bubble, reducing the local surface tension of the foam can cause the foam to burst rapidly. When the alcohol is used as a foam stabilizer, it mainly acts on the foam base liquid, and the low-carbon alcohol is dissolved in the foam base liquid, which can enhance the surface viscosity of the solution and increase the strength of the foam liquid film. If a low-carbon alcohol with both defoaming and foam stabilization is found and combined with the foam drilling process, the recycling of the drilling foam can be achieved.
发明内容 Summary of the invention
本发明要解决的技术问题是：针对上述情况，找到一种兼具有消泡和稳泡作用的醇类物质，并与泡沫钻井工艺相结合，实现钻井泡沫的循环利用。 The technical problem to be solved by the present invention is that, in view of the above situation, an alcohol substance having both defoaming and foam stabilization functions is found, and combined with the foam drilling process, the recycling of the drilling foam is realized.
发明人发现，某些低碳醇兼具有强消泡性和弱抑泡性的特点，即同一低碳醇不仅可作为消泡剂使用，还具有稳泡的能力，只需向泡沫基液中添加此类低碳醇，即可实现泡沫的循环利用。向已发泡的泡沫体系中添加少量低碳醇，低碳醇快速在泡沫表面铺展并与气泡液膜接触，降低泡沫局部表面张力，导致泡沫迅速破灭；在溶解度范围内，在泡沫表面起消泡作用的低碳醇消泡后即迅速下沉并溶解于泡沫基液中，发挥其增强溶液表面粘度和提高泡沫液膜强度的稳泡作用，而失去消泡作用，搅拌此泡沫基液可再次发泡，如此循环即可实现泡沫的循环利用。 The inventors have found that certain lower alcohols have the characteristics of strong defoaming and weak foam inhibition, that is, the same lower alcohol can be used not only as a defoaming agent, but also has the ability to stabilize foam, and only needs to be used as a foam base liquid. The recycling of the foam can be achieved by adding such a lower alcohol. Adding a small amount of lower alcohol to the foamed foam system, the low-carbon alcohol rapidly spreads on the surface of the foam and contacts the bubble liquid film, reducing the local surface tension of the foam, causing the foam to burst rapidly; in the solubility range, the surface of the foam is eliminated. After the defoaming of the low-alcohol of the foaming effect, it quickly sinks and dissolves in the foam base liquid, exerts its stabilizing effect of enhancing the surface viscosity of the solution and increasing the strength of the foam liquid film, and loses the defoaming effect, and the foam base liquid can be stirred. Re-foaming, such a cycle can achieve recycling of the foam.
为了达到上述发明目的，本发明实施如下的技术方案： In order to achieve the above object, the present invention implements the following technical solutions:
一种利用低碳醇实现泡沫钻井的泡沫循环利用方法，将经井筒循环后从井口返出的泡沫，加入低碳醇进行消泡，消泡后的泡沫液进行发泡，再次入井使用，如此进行泡沫的循环利用，加入的消泡剂包括至少一种结构式为 R-OH 、 R 为含4个碳原子或5个碳原子的烃基的低碳醇。 A foam recycling method for foam drilling using low-carbon alcohol, the foam returned from the wellhead after circulating through the wellbore is added with a lower alcohol to defoam, and the foamed liquid after defoaming is foamed and used again into the well. Recycling the foam, the added antifoaming agent includes at least one structural formula R-OH and R are lower alcohols having a hydrocarbon group of 4 carbon atoms or 5 carbon atoms.
作为优选方式，所述低碳醇为正丁醇、异丁醇、正戊醇、异戊醇、新戊醇中的一种或多种。 Preferably, the lower alcohol is one or more of n-butanol, isobutanol, n-pentanol, isoamyl alcohol, and neopentyl alcohol.
作为优选方式，所述的消泡剂还包括磷酸三丁酯。 Preferably, the antifoaming agent further comprises tributyl phosphate.
作为优选方式，所述的低碳醇与磷酸三丁酯的体积比为1：5～5：1。 Preferably, the volume ratio of the lower alcohol to the tributyl phosphate is from 1:5 to 5:1.
作为优选方式，每次循环新加入的醇类消泡剂为泡沫基液体积的 0.6-0.9% ，若经多次循环后泡沫基液中的低碳醇体积含量占泡沫基液体积的 5% 以上， 则将低碳醇去除。 Preferably, the newly added alcohol defoamer is 0.6-0.9% by volume of the foam base liquid per cycle. If the volume of the lower alcohol in the foam base liquid exceeds 5% by volume of the foam base liquid after repeated cycles, the lower alcohol is removed.
本发明所述的低碳醇对发泡剂不具有选择性，且消泡速度快，适用于油田常用发泡剂，如十二烷基苯磺酸钠（ ABS ）、十二烷基硫酸钠 （ K12 ） 、十二醇聚氧乙烯醚 （ AEO ） 、脂肪醇醚硫酸盐 （ AES ） 。 The low-carbon alcohol of the invention has no selectivity to the foaming agent and has a fast defoaming speed, and is suitable for the commonly used foaming agent in oil fields, such as sodium dodecylbenzenesulfonate (ABS). ), sodium lauryl sulfate (K12), dodecyl polyoxyethylene ether (AEO), fatty alcohol ether sulfate (AES).
其它添加剂可根据实际钻井需要添加，如稳泡剂、井壁稳定剂、防腐剂等。 Other additives may be added according to actual drilling needs, such as foam stabilizers, well wall stabilizers, preservatives, and the like.
本发明所述的低碳醇、用于发泡的发泡剂以及根据需要添加的添加剂，都是化工厂生产的市售有机化合物。 The lower alcohols, the foaming agents for foaming, and the additives added as needed according to the present invention are all commercially available organic compounds produced by chemical plants.
本发明的有益效果：①采用该方法进行泡沫循环，只需添加醇类消泡剂，不需要在循环过程中添加酸碱调节基液 pH 值，醇类消泡剂可再次利用；②醇类消泡剂对发泡剂不具有选择性，且消泡速度快；③若经多次循环后泡沫基液中的的低碳醇体积含量占泡沫基液体积的 5% 以上，则将低碳醇去除，实现泡沫基液的多次循环利用；④可降低泡沫钻井成本，实现环境友好。 The beneficial effects of the invention: 1 The foaming cycle is carried out by using the method, only the alcohol defoaming agent is added, and the pH of the base liquid is not required to be added during the circulation. Value, alcohol defoamer can be reused; 2 alcohol defoamer is not selective to the foaming agent, and the defoaming speed is fast; 3 if the volume of the lower alcohol in the foam base liquid after multiple cycles 5% of the volume of the foam base In the above, the low-carbon alcohol is removed to achieve multiple recycling of the foam base liquid; 4, the foam drilling cost can be reduced, and the environment is friendly.
附图说明 DRAWINGS
图1为室内实验所用的泡沫循环装置图。 Figure 1 is a diagram of a foam circulation device used in an indoor experiment.
其中，1.基液罐；2.截止阀；3.离心泵；4.孔板流量计；5.空压机；6.放空阀；7.贮气罐；8.截止阀；9.转子流量计；10.截止阀；11.孔隙式泡沫发生器；12.压力表；13.截止阀；14.泡沫观察管；15.截止阀；16.泡沫取样器；17.压力表；18.截止阀；19. 喷淋管；20. 搅拌器；21.消泡室；22.压力表；23.截止阀；24.计量泵；25.消泡剂储罐；26.截止阀；27.离心泵；28.截止阀；29.缓冲罐；30.取样口；31.截止阀；32.离心泵；33.截止阀。 Among them, 1. base liquid tank; 2. shut-off valve; 3. centrifugal pump; 4. orifice flowmeter; 5. air compressor; 6. vent valve; 7. gas storage tank; 8. shut-off valve; Flowmeter; 10. shut-off valve; 11. pore foam generator; 12. pressure gauge; 13. shut-off valve; 14. foam observation tube; 15. shut-off valve; 16. foam sampler; 17. pressure gauge; Globe valve; 19. Spray pipe; 20. Agitator; 21. defoaming chamber; 22. pressure gauge; 23. shut-off valve; 24. metering pump; 25. defoamer storage tank; 26. shut-off valve; 27. centrifugal pump; 28. shut-off valve; Tank; 30. sampling port; 31. shut-off valve; 32. centrifugal pump; 33.
具体实施方式 detailed description
本说明书中公开的所有特征，或公开的所有方法或过程中的步骤，除了互相排斥的特征和/或步骤以外，均可以以任何方式组合。 All of the features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner other than mutually exclusive features and/or steps.
下述实施例中，各配方成份代号如下： In the following examples, the ingredients of each formula are as follows:
K1 2 为十二烷基硫酸钠， ABS 为十二烷基苯磺酸钠， XC 为生物聚合物， HV-CMC 为高粘羧甲基纤维素。 K1 2 is sodium lauryl sulfate, ABS is sodium dodecylbenzene sulfonate, XC is biopolymer, HV-CMC It is a highly viscous carboxymethyl cellulose.
室内实验所用的泡沫循环装置见附图1。其实验过程如下所述： The foam circulation device used in the laboratory experiments is shown in Fig. 1. The experimental process is as follows:
在泡沫基液罐1中预先配制一定浓度的泡沫基液，泡沫基液由截止阀2、离心泵3、孔板流量计4进入孔隙式泡沫发生器11，空气经由空压机5、贮气罐7、截止阀8、转子流量计9、截止阀10进入孔隙式泡沫发生器11，贮气罐7上的放空阀6用于调节贮气罐的压力平衡与稳定。通过调节基液性能、气液比等参数，可改变孔隙式泡沫发生器内生成的泡沫性能。从孔隙式泡沫发生器11出口端的压力表12和截止阀13流出的泡沫进入泡沫观察管14。从泡沫观察管14底端的截止阀15流出的泡沫经泡沫取样器16、压力表17和截止阀18进入消泡室21。在消泡剂储罐25中预先配制一定浓度的消泡剂，包括低碳醇或者低碳醇与磷酸三丁酯的混合物；消泡剂储罐25中的消泡剂，由计量泵24、截止阀23和压力表22进入喷淋管19，通过喷淋管19将消泡剂均匀喷洒到泡沫上，实现快速消泡的目的，在消泡的同时开启搅拌器20。破泡后的液体从消泡室21底部，经截止阀26、离心泵27、截止阀28进入缓冲罐29，为便于监测消泡后泡沫性能，在缓冲罐29底部安装有取样口30。缓冲罐29中的泡沫基液经由截止阀31、离心泵32、截止阀33回流到泡沫基液罐1，实现泡沫的循环利用。 A certain concentration of foam base liquid is pre-formulated in the foam base tank 1. The foam base liquid enters the pore type foam generator 11 by the shut-off valve 2, the centrifugal pump 3, the orifice flow meter 4, and the air is passed through the air compressor 5, and the air is stored. The tank 7, the shut-off valve 8, the rotor flow meter 9, and the shut-off valve 10 enter the pore type foam generator 11, and the vent valve 6 on the air tank 7 is used to adjust the pressure balance and stability of the gas tank. By adjusting the properties of the base fluid, gas-liquid ratio and other parameters, the foam properties generated in the pore foam generator can be changed. The foam flowing out of the pressure gauge 12 and the shutoff valve 13 at the outlet end of the bubble type foam generator 11 enters the foam observation tube 14. The foam flowing out of the shutoff valve 15 at the bottom end of the foam observation tube 14 enters the defoaming chamber 21 via the bubble sampler 16, the pressure gauge 17, and the shutoff valve 18. Preparing a certain concentration of antifoaming agent in the antifoam storage tank 25, including a lower alcohol or a mixture of lower alcohol and tributyl phosphate; the antifoaming agent in the antifoam storage tank 25, by the metering pump 24, The shutoff valve 23 and the pressure gauge 22 enter the spray pipe 19, and the defoaming agent is evenly sprayed onto the foam through the spray pipe 19 to achieve the purpose of rapid defoaming, and the stirrer 20 is turned on while defoaming. The bubbled liquid enters the buffer tank 29 from the bottom of the defoaming chamber 21 via the shutoff valve 26, the centrifugal pump 27, and the shutoff valve 28. To facilitate monitoring of the foam performance after defoaming, a sampling port 30 is installed at the bottom of the buffer tank 29. The foam base liquid in the buffer tank 29 is returned to the foam base tank 1 via the shutoff valve 31, the centrifugal pump 32, and the shutoff valve 33, thereby achieving recycling of the foam.
以下实施例详细说明了本发明的应用。 The following examples illustrate the application of the invention in detail.
实施例1 Example 1
在泡沫基液罐1中预先配制 82L 泡沫基液，按质量百分浓度计算，泡沫基液配方为： 0.8%K12 、 0.2%XC 、 0.1% HV-CMC ，其余为自来水。 调节气体流量为 1.6m3 /min ，液体流量为 20L /min ，此时气液比为80，消泡剂储罐25中添加有4.5L异戊醇，以 0.12 L /min 的流量将异戊醇均匀喷洒到泡沫上，同时以 300r/min 转速开启搅拌器。消泡后的泡沫液进入缓冲罐29、基液罐1，实现泡沫的循环利用。In the foam base tank 1, 82 L of foam base liquid was prepared in advance, and the foam base liquid formula was 0.8% K12, 0.2% XC, 0.1% HV-CMC, and the balance was tap water. The gas flow rate was adjusted to 1.6 m 3 /min, the liquid flow rate was 20 L / min, and the gas-liquid ratio was 80. The defoamer storage tank 25 was added with 4.5 L of isoamyl alcohol, and the isoprene was flowed at a flow rate of 0.12 L /min. The alcohol was evenly sprayed onto the foam while the stirrer was turned on at 300 r/min. The defoamed foam liquid enters the buffer tank 29 and the base liquid tank 1 to realize recycling of the foam.
每次循环新加入的 异戊醇 为泡沫基液体积的 0.6% ，为便于观察和监测每次消泡后泡沫性能，每间隔 4min 将缓冲罐中消泡后的泡沫基液通过离心泵打到泡沫基液罐，同时从缓冲罐底部取样，用 Waring 搅拌器测试泡沫质量和半衰期，监测结果见表 1 所示。由表 1 可见，此泡沫基液经 9 次循环后，发泡体积和半衰期才有了较多的下降，此时进入基液罐中的异戊醇体积为 4.32L ，泡沫基液总体积为 86.32L ，这时异戊醇体积含量占泡沫基液总体积的 5% ，需将异戊醇去除，去除的异戊醇进入消泡剂添加罐回收利用，在基液罐中补充 65.6g K12 发泡剂（ K12 加量为原基液加量的 10% ）后，此泡沫基液可重新发泡，泡沫性能达到初始发泡性能，进行新的泡沫循环，从而实现泡沫的多次循环利用。 The newly added isoamyl alcohol per cycle is 0.6% of the volume of the foam base solution. For ease of observation and monitoring of foam performance after each defoaming, each interval 4min The foam base liquid in the buffer tank was defoamed to the foam base tank through a centrifugal pump, and the bottom of the buffer tank was sampled. The foam quality and half-life were tested by a Waring blender. The monitoring results are shown in Table 1. By table 1 It can be seen that after 9 cycles of the foam base liquid, the foaming volume and half-life have decreased more. At this time, the volume of isoamyl alcohol entering the base tank is 4.32L, and the total volume of the foam base liquid is 86.32L. At this time, the volume of isoamyl alcohol accounts for 5% of the total volume of the foam base liquid, and the isoamyl alcohol needs to be removed, and the removed isoamyl alcohol is recycled into the defoaming agent addition tank, and 65.6 g of K12 foam is added to the base liquid tank. Agent (K12 After the addition amount is 10% of the amount of the base liquid, the foam base liquid can be re-foamed, the foam performance reaches the initial foaming performance, and a new foam cycle is performed, thereby achieving multiple recycling of the foam.
表 1 泡沫循环实验结果 Table 1 Results of the foam cycle experiment
循环次数 Cycles 发泡体积（ ml ） Foaming volume ( ml ) 半衰期（ min ） Half-life (min)
0 0 525 525 31.5 31.5
1 1 510 510 28.4 28.4
2 2 460 460 26.1 26.1
3 3 440 440 24.3 24.3
4 4 420 420 21.2 21.2
5 5 410 410 18.2 18.2
6 6 380 380 17.0 17.0
7 7 375 375 16.1 16.1
8 8 360 360 15.4 15.4
9 9 340 340 13.2 13.2
10 10 530 530 30.7 30.7
注：第十次测试前，将异戊醇去除，重新补充 65.6g 发泡剂 K12 。 Note: Before the tenth test, isoamyl alcohol was removed and 65.6 g of blowing agent K12 was replenished.
实施例 2 Example 2
在泡沫基液罐中预先配制 100L 泡沫基液， 按质量百分浓度计算，泡沫基液配方为： 0.6%ABS 、 0.2%XC 、 0.2%HV-CMC ，其余为自来水。 调节气体流量为 1.5m3 /min ，液体流量为 21.1L /min ，此时气液比为71.1。消泡剂储罐中添加有6.5L正丁醇，以 0.19L /min 的流量将正丁醇均匀喷洒到泡沫上，同时以 250r/min 转速开启搅拌器。消泡后的泡沫液进入缓冲罐、基液储罐，实现泡沫的循环利用。Prepare 100L foam base liquid in the foam base tank. The foam base liquid formula is: 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the rest is tap water. The gas flow rate was adjusted to 1.5 m 3 /min and the liquid flow rate was 21.1 L / min. The gas-liquid ratio was 71.1. 6.5 L of n-butanol was added to the defoamer tank, and n-butanol was evenly sprayed onto the foam at a flow rate of 0.19 L /min while the stirrer was turned on at 250 r/min. The defoamed foam liquid enters the buffer tank and the base liquid storage tank to realize the recycling of the foam.
每次循环新加入的 正丁醇 为泡沫基液体积的 0.9% ， 为便于观察和监测每次消泡后泡沫性能，每间隔 4.5min 将缓冲罐中消泡后的泡沫基液通过离心泵打到泡沫基液罐，同时从缓冲罐底部取样，用 Waring 搅拌器测试泡沫质量和半衰期，监测结果见表2所示。由表2可见，此泡沫基液经7次循环后，发泡体积和半衰期才有了较多的下降，这说明本发明所用的正丁醇可用于泡沫循环，前7次都不用补充新的发泡剂。 The newly added n-butanol per cycle is 0.9% of the volume of the foam base. For ease of observation and monitoring of foam performance after each defoaming, each interval 4.5min. The foam base liquid after defoaming in the buffer tank is pumped to the foam base tank through the centrifugal pump, and is sampled from the bottom of the buffer tank. The agitator was used to test the foam quality and half-life. The monitoring results are shown in Table 2. It can be seen from Table 2 that the foaming volume and half-life of the foam base liquid have decreased more after 7 cycles, which indicates that the n-butanol used in the present invention can be used in the foam cycle, and the first seven times are not required to be supplemented with new ones. Foaming agent.
泡沫基液经7次循环后，进入基液罐中的正丁醇体积为5.98L，泡沫基液总体积为105.98L，这时正丁醇体积含量占泡沫基液总体积的5.6%，需将正丁醇去除，去除的正丁醇进入消泡剂添加罐回收利用，在基液罐中补充60g ABS 发泡剂后，此泡沫基液可重新发泡， 进行新的泡沫循环，从而实现泡沫的多次循环利用。 After 7 cycles of the foam base liquid, the volume of n-butanol entering the base tank is 5.98L, and the total volume of the foam base liquid is 105.98L. At this time, the volume of n-butanol is 5.6% of the total volume of the foam base liquid. The n-butanol is removed, and the removed n-butanol is recycled into the defoaming agent addition tank, and 60 g is added to the base tank. After the ABS blowing agent, the foam base liquid can be re-foamed to perform a new foam cycle, thereby achieving multiple recycling of the foam.
表 2 泡沫循环实验结果 Table 2 Results of the foam cycle experiment
循环次数 Cycles 发泡体积（ ml ） Foaming volume ( ml ) 半衰期（ min ） Half-life (min)
0 0 510 510 22.5 22.5
1 1 490 490 18.4 18.4
2 2 460 460 16.5 16.5
3 3 430 430 15.3 15.3
4 4 410 410 13.1 13.1
5 5 390 390 12.8 12.8
6 6 380 380 11.0 11.0
7 7 340 340 10.3 10.3
8 8 515 515 21.7 21.7
注：第 8 次测试前，将 正丁醇 去除，重新补充 60g 发泡剂 ABS 。 Note: Before the 8th test, n-butanol was removed and 60 g of blowing agent ABS was replenished.
实施例 3 Example 3
在泡沫基液罐中预先配制95L泡沫基液，按质量百分浓度计算，泡沫基液配方为： 0.6%ABS 、 0.2%XC 、 0.2%HV-CMC ，其余为自来水。调节气体流量为 1.5m3 /min ，液体流量为19.7L/min，此时气液比为76.1。消泡剂储罐中添加有6.5L正戊醇与磷酸三丁酯的混合物，两者的体积比为1：5，以0.16L/min的流量将正戊醇与磷酸三丁酯的混合物均匀喷洒到泡沫上，同时以250r/min转速开启搅拌器。消泡后的泡沫液依次进入缓冲罐、基液储罐，从而实现泡沫的循环利用。95L foam base liquid was pre-formulated in the foam base tank. The foam base liquid formula was: 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the rest was tap water. The gas flow rate was adjusted to 1.5 m 3 /min, and the liquid flow rate was 19.7 L/min, at which time the gas-liquid ratio was 76.1. A mixture of 6.5 L of n-pentanol and tributyl phosphate was added to the defoamer tank, and the volume ratio of the two was 1:5, and the mixture of n-pentanol and tributyl phosphate was uniformly distributed at a flow rate of 0.16 L/min. Spray onto the foam while turning on the stirrer at 250 r/min. The defoamed foam liquid enters the buffer tank and the base liquid storage tank in order to realize the recycling of the foam.
每次循环新加入的 正戊醇与磷酸三丁酯的混合物 为泡沫基液体积的 0.81% ， 为便于观察和监测每次消泡后泡沫性能，每间隔4.5min将缓冲罐中消泡后的泡沫基液通过离心泵打到泡沫基液罐，同时从缓冲罐底部取样，用 Waring 搅拌器测试泡沫质量和半衰期，监测结果见表3所示。由表3可见，此泡沫基液经8次循环后，发泡体积和半衰期才有了较多的下降，这说明本发明所用的正戊醇与磷酸三丁酯的混合物可用于泡沫循环，前8次都不用补充新的发泡剂。 The newly added mixture of n-pentanol and tributyl phosphate per cycle is 0.81% of the volume of the foam base solution. In order to facilitate observation and monitoring of the foam performance after each defoaming, the foam base liquid in the buffer tank was defoamed by a centrifugal pump to the foam base tank at intervals of 4.5 min, while sampling from the bottom of the buffer tank, using Waring The agitator was used to test the foam quality and half-life. The monitoring results are shown in Table 3. It can be seen from Table 3 that the foaming volume and the half-life of the foam base liquid have decreased more after 8 cycles, which indicates that the mixture of n-pentanol and tributyl phosphate used in the present invention can be used for the foam cycle. No new blowing agent is needed for 8 times.
泡沫基液经8次循环后，进入基液罐中的正戊醇与磷酸三丁酯的混合物体积为5.76L，泡沫基液总体积为100.76L，这时正戊醇与磷酸三丁酯的混合物体积含量占泡沫基液总体积的5.7%，需将正戊醇与磷酸三丁酯的混合物去除，去除的正戊醇与磷酸三丁酯的混合物进入消泡剂添加罐回收利用，在基液罐中补充57g ABS 发泡剂后，此泡沫基液可重新发泡，从而实现泡沫的多次循环利用。 After 8 cycles of the foam base liquid, the volume of the mixture of n-pentanol and tributyl phosphate entering the base tank is 5.76L, and the total volume of the foam base liquid is 100.76L. At this time, n-pentanol and tributyl phosphate are used. The volume of the mixture is 5.7% of the total volume of the foam base liquid. The mixture of n-pentanol and tributyl phosphate is removed, and the mixture of n-pentanol and tributyl phosphate removed is recycled into the defoaming agent tank. Add 57g to the tank After the ABS blowing agent, the foam base liquid can be re-foamed, thereby achieving multiple recycling of the foam.
表 3 泡沫循环实验结果 Table 3 Foam cycle experiment results
循环次数 Cycles 发泡体积（ ml ） Foaming volume ( ml ) 半衰期（ min ） Half-life (min)
0 0 510 510 22.5 22.5
1 1 480 480 19.7 19.7
2 2 475 475 18.1 18.1
3 3 440 440 16.8 16.8
4 4 400 400 15.1 15.1
5 5 390 390 13.2 13.2
6 6 380 380 12.2 12.2
7 7 375 375 11.3 11.3
8 8 340 340 9.3 9.3
9 9 505 505 22.1 22.1
注：第 9 次测试前，将 正戊醇与磷酸三丁酯的混合物 去除，重新补充 57g 发泡剂 ABS 。 Note: Prior to the 9th test, the mixture of n-pentanol and tributyl phosphate was removed and 57 g of blowing agent ABS was replenished.
实施例 4 Example 4
在泡沫基液罐中预先配制90L泡沫基液，按质量百分浓度计算，泡沫基液配方为： 0.6%ABS、0.2%XC、0.2%HV-CMC、其余为自来水。调节气体流量为 1.5m3 /min ，液体流量为19.5L/min，此时气液比为76.9。消泡剂储罐中添加有70L异丁醇与磷酸三丁酯的混合物，两者的体积比为5：1，以0.17L/min的流量将异丁醇与磷酸三丁酯的混合物均匀喷洒到泡沫上，同时以250r/min转速开启搅拌器。消泡后的泡沫液依次进入缓冲罐、基液储罐，从而实现泡沫的循环利用。A 90 L foam base liquid was preliminarily prepared in a foam base tank, and the foam base liquid formula was 0.6% ABS, 0.2% XC, 0.2% HV-CMC, and the balance was tap water. The gas flow rate was adjusted to 1.5 m 3 /min and the liquid flow rate was 19.5 L/min, at which time the gas-liquid ratio was 76.9. A mixture of 70 L of isobutanol and tributyl phosphate was added to the defoamer tank, and the volume ratio of the two was 5:1, and the mixture of isobutanol and tributyl phosphate was uniformly sprayed at a flow rate of 0.17 L/min. On the foam, turn on the stirrer at 250 r/min. The defoamed foam liquid enters the buffer tank and the base liquid storage tank in order to realize the recycling of the foam.
每次循环新加入的 异丁醇与磷酸三丁酯的混合物 为泡沫基液体积的 0.87% ， 为便于观察和监测每次消泡后泡沫性能，每间隔4.5min将缓冲罐中消泡后的泡沫基液通过离心泵打到泡沫基液罐，同时从缓冲罐底部取样，用 Waring 搅拌器测试泡沫质量和半衰期，监测结果见表4所示。由表4可见，此泡沫基液经9次循环后，发泡体积和半衰期才有了较多的下降，这说明本发明所用的异丁醇与磷酸三丁酯的混合物可用于泡沫循环，前9次都不用补充新的发泡剂。 The mixture of isobutanol and tributyl phosphate added in each cycle is 0.87% of the volume of the foam base. In order to facilitate observation and monitoring of the foam performance after each defoaming, the foam base liquid in the buffer tank was defoamed by a centrifugal pump to the foam base tank at intervals of 4.5 min, while sampling from the bottom of the buffer tank, using Waring The agitator was used to test the foam quality and half-life. The monitoring results are shown in Table 4. It can be seen from Table 4 that the foaming volume and the half-life of the foam base liquid have decreased more after 9 cycles, which indicates that the mixture of isobutanol and tributyl phosphate used in the present invention can be used for the foam cycle. No new blowing agent is needed for 9 times.
泡沫基液经9次循环后，进入基液罐中的异丁醇与磷酸三丁酯的混合物体积为6.9L，泡沫基液总体积为96.9L，这时异丁醇与磷酸三丁酯的混合物体积含量占泡沫基液总体积的7.1%，需将异丁醇与磷酸三丁酯的混合物去除，去除的低碳醇进入消泡剂添加罐回收利用，在基液罐中补充54g ABS 发泡剂后，此泡沫基液可重新发泡，从而实现泡沫的多次循环利用。 After 9 cycles of the foam base solution, the volume of the mixture of isobutanol and tributyl phosphate entering the base tank was 6.9 L, and the total volume of the foam base liquid was 96.9 L. At this time, isobutanol and tributyl phosphate were used. The volume content of the mixture is 7.1% of the total volume of the foam base liquid. The mixture of isobutanol and tributyl phosphate is removed, and the removed lower alcohol is recycled into the defoamer addition tank, and 54g is added to the base tank. After the ABS blowing agent, the foam base liquid can be re-foamed, thereby achieving multiple recycling of the foam.
表 4 泡沫循环实验结果 Table 4 Results of the foam cycle experiment
循环次数 Cycles 发泡体积（ ml ） Foaming volume ( ml ) 半衰期（ min ） Half-life (min)
0 0 510 510 22.5 22.5
1 1 480 480 19.7 19.7
2 2 475 475 18.1 18.1
3 3 440 440 16.8 16.8
4 4 400 400 15.1 15.1
5 5 390 390 13.2 13.2
6 6 380 380 12.2 12.2
7 7 375 375 11.3 11.3
8 8 350 350 9.8 9.8
9 9 340 340 9.3 9.3
10 10 515 515 22.3 22.3
注：第 10 次测试前，将 异丁醇与磷酸三丁酯的混合物 去除，重新补充 54g 发泡剂 ABS 。 Note: Prior to the 10th test, the mixture of isobutanol and tributyl phosphate was removed and 54 g of blowing agent ABS was replenished.
实施例5 Example 5
在泡沫基液罐中预先配制 90L 泡沫基液，按质量百分浓度计算，泡沫基液配方为： 0.8%K12 、 0.2%XC 、 0.2% HV-CMC ，其余为自来水。 调节气体流量为 1.6m3 /min ，液体流量为 21.3L /min ，此时气液比为75.1，消泡剂储罐中添加有5.5L新戊醇，以 0.16 L /min 的流量将新戊醇均匀喷洒到泡沫上，同时以 300r/min 转速开启搅拌器。消泡后的泡沫液进入缓冲罐、基液罐，实现泡沫的循环利用。90L foam base solution was pre-formulated in the foam base tank. The foam base solution was: 0.8% K12, 0.2% XC, 0.2% HV-CMC, and the rest was tap water. The gas flow rate was adjusted to 1.6 m 3 /min, the liquid flow rate was 21.3 L / min, and the gas-liquid ratio was 75.1. The defoamer storage tank was filled with 5.5 L of neopentyl alcohol, and the flow rate was 0.16 L /min. The alcohol was evenly sprayed onto the foam while the stirrer was turned on at 300 r/min. The defoamed foam liquid enters the buffer tank and the base liquid tank to realize the recycling of the foam.
每次循环新加入的新戊醇为泡沫基液体积的0.75%，为便于观察和监测每次消泡后泡沫性能，每间隔4min将缓冲罐中消泡后的泡沫基液通过离心泵打到泡沫基液罐，同时从缓冲罐底部取样，用Waring搅拌器测试泡沫质量和半衰期，监测结果见表5所示。由表5可见，此泡沫基液经8次循环后，发泡体积和半衰期才有了较多的下降，此时进入基液罐中的新戊醇体积为5.12L，泡沫基液总体积为95.12L，这时新戊醇体积含量占泡沫基液总体积的5.4%，需将新戊醇去除，去除的新戊醇进入消泡剂添加罐回收利用，在基液罐中补充72gK12发泡剂后，此泡沫基液可重新发泡，泡沫性能达到初始发泡性能，进行新的泡沫循环，从而实现泡沫的多次循环利用。 The newly added neopentyl alcohol per cycle is 0.75% of the volume of the foam base. To facilitate observation and monitoring of the foam performance after each defoaming, the foam base liquid in the buffer tank is defoamed by a centrifugal pump every 4 minutes. The foam-based liquid tank was sampled from the bottom of the buffer tank, and the foam quality and half-life were tested with a Waring blender. The monitoring results are shown in Table 5. It can be seen from Table 5 that after 8 cycles of the foam base liquid, the foaming volume and half-life have decreased more. At this time, the volume of neopentyl alcohol entering the base liquid tank is 5.12 L, and the total volume of the foam base liquid is 95.12L, at this time, the volume of neopentyl alcohol accounts for 5.4% of the total volume of the foam base liquid. The neopentyl alcohol needs to be removed, and the removed neopentyl alcohol enters the defoaming agent addition tank for recycling, and 72gK12 foam is added to the base liquid tank. After the agent, the foam base liquid can be re-foamed, the foam performance reaches the initial foaming performance, and a new foam cycle is performed, thereby achieving multiple recycling of the foam.
表 5 泡沫循环实验结果 Table 5 Results of the foam cycle experiment
循环次数 Cycles 发泡体积（ ml ） Foaming volume ( ml ) 半衰期（ min ） Half-life (min)
0 0 505 505 36.7 36.7
1 1 490 490 33.2 33.2
2 2 460 460 28.6 28.6
3 3 430 430 25.1 25.1
4 4 410 410 24.1 24.1
5 5 390 390 19.2 19.2
6 6 380 380 17.8 17.8
7 7 365 365 16.9 16.9
8 8 340 340 15.8 15.8
9 9 510 510 36.2 36.2
注：第九次测试前，将新戊醇去除，重新补充 72g 发泡剂 K12 。 Note: Prior to the ninth test, the pentaerythritol was removed and 72 g of blowing agent K12 was replenished.

Claims (1)

1 、一种利用低碳醇实现泡沫钻井的泡沫循环利用方法，将经井筒循环后从井口返出的泡沫，加入低碳醇进行消泡，消泡后的泡沫液进行发泡，再次入井使用，如此进行泡沫的循环利用，其特征在于：加入的消泡剂包括至少一种结构式为 R-OH 、 R 为含4个碳原子或5个碳原子的烃基的低碳醇。1 A foam recycling method for foam drilling using low-carbon alcohol, the foam returned from the wellhead after circulating through the wellbore is defoamed by adding a lower alcohol, and the foamed liquid after defoaming is foamed and used again into the well. The recycling of the foam is carried out in such a manner that the added antifoaming agent comprises at least one structural formula R-OH and R are lower alcohols having a hydrocarbon group of 4 carbon atoms or 5 carbon atoms.
2 、如权利要求1所述的利用低碳醇实现泡沫钻井的泡沫循环利用方法，其特征在于：所述低碳醇为正丁醇、异丁醇、正戊醇、异戊醇、新戊醇中的一种或多种。2 The foam recycling method for foam drilling using low alcohol alcohol according to claim 1, wherein the lower alcohol is n-butanol, isobutanol, n-pentanol, isoamyl alcohol, neopentyl alcohol One or more of them.
3 、如权利要求1或2所述的利用低碳醇实现泡沫钻井的泡沫循环利用方法，其特征在于：所述的消泡剂还包括磷酸三丁酯。3 The foam recycling method for foam drilling using a lower alcohol according to claim 1 or 2, wherein the antifoaming agent further comprises tributyl phosphate.
4 、如权利要求3所述的利用低碳醇实现泡沫钻井的泡沫循环利用方法，其特征在于：所述的低碳醇与磷酸三丁酯的体积比为1：5～5：1。4 The foam recycling method for foam drilling using a lower alcohol according to claim 3, wherein the volume ratio of the lower alcohol to the tributyl phosphate is 1:5 to 5:1.
5 、如权利要求1、2、4任意一项所述的利用低碳醇实现泡沫钻井的泡沫循环利用方法，其特征在于：每次循环新加入的醇类消泡剂为泡沫基液体积的 0.6-0.9% ，若经多次循环后泡沫基液中的低碳醇体积含量占泡沫基液体积的 5% 以上，则将低碳醇去除。5 The foam recycling method for foam drilling using low alcohol alcohol according to any one of claims 1 to 2, wherein the newly added alcohol defoaming agent per cycle is 0.6 volume of the foam base liquid. -0.9% If the volume of the lower alcohol in the foam base liquid exceeds 5% by volume of the foam base liquid after repeated cycles, the lower alcohol is removed.
6 、如权利要求3所述的利用低碳醇实现泡沫钻井的泡沫循环利用方法，其特征在于：每次循环新加入的醇类消泡剂为泡沫基液体积的 0.6-0.9% ，若经多次循环后泡沫基液中的低碳醇体积含量占泡沫基液体积的 5% 以上， 则将低碳醇去除。6. The foam recycling method for foam drilling using low alcohol alcohol according to claim 3, wherein the newly added alcohol defoaming agent is a foam base liquid volume per cycle. 0.6-0.9%, if the volume of the lower alcohol in the foam base liquid exceeds 5% of the volume of the foam base liquid after repeated cycles, the lower alcohol is removed.
PCT/CN2011/077126 2010-07-20 2011-07-14 Method for circulatory use of foam in foam drilling by means of low-carbon alcohol WO2012010061A1 (en)

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101871330A (en) * 2010-07-20 2010-10-27 西南石油大学 Foam cyclic utilization method by utilizing low carbon alcohol to realize foam drilling
CN103195372B (en) * 2013-04-24 2016-08-17 中国电建集团中南勘测设计研究院有限公司 A kind of screw type bit and a kind of foam drilling device and foam drilling technique
CN103899261A (en) * 2014-04-11 2014-07-02 中国石油大学(北京) Visualization experiment device and method for sand-carrying of foam discharging shaft
CN107975349B (en) * 2016-10-21 2023-09-29 中国石油化工股份有限公司 Oil field jet sand-washing blocking-removing operation waste liquid treatment device and method
CN112240173B (en) * 2019-07-18 2023-06-02 中国石油化工股份有限公司 Foam circulation-based oil-gas well sand washing method, defoaming liquid for oil-gas well sand washing and foaming liquid

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006021792A2 (en) * 2004-08-24 2006-03-02 Halliburton Energy Services, Inc. Cement compositions comprising environmentally compatible defoamers and methods of use
GB2429453A (en) * 2005-08-23 2007-02-28 Bj Services Co Environmentally friendly defoamer
US7273103B2 (en) * 2005-06-03 2007-09-25 Halliburtoncenergy Services, Inc. Cement compositions comprising environmentally compatible defoaming agents and methods of use
CN101463714A (en) * 2009-01-09 2009-06-24 西南石油大学 Foam cyclic utilization method used for under balance drilling
CN101871330A (en) * 2010-07-20 2010-10-27 西南石油大学 Foam cyclic utilization method by utilizing low carbon alcohol to realize foam drilling
CN101885960A (en) * 2010-07-20 2010-11-17 西南石油大学 Alcohol defoaming agent used in method for recycling foams of foam drilling

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3394768A (en) * 1965-10-04 1968-07-30 Richardson Co Fatty alcohols as performance boosters and foam stabilizers with fatty alcohol sulfate salts
US3486560A (en) * 1968-04-12 1969-12-30 Chevron Res Ammoniated foamed well circulation fluids and uses thereof
US3754561A (en) * 1972-02-04 1973-08-28 Chevron Res Foam circulation fluids
CN201284636Y (en) * 2008-11-07 2009-08-05 西南石油大学 Circulating foam simulation experiment apparatus
CN101560870B (en) * 2009-05-27 2012-11-28 西南石油大学 Foam base liquid recycling system in foam drilling

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006021792A2 (en) * 2004-08-24 2006-03-02 Halliburton Energy Services, Inc. Cement compositions comprising environmentally compatible defoamers and methods of use
US7273103B2 (en) * 2005-06-03 2007-09-25 Halliburtoncenergy Services, Inc. Cement compositions comprising environmentally compatible defoaming agents and methods of use
GB2429453A (en) * 2005-08-23 2007-02-28 Bj Services Co Environmentally friendly defoamer
CN101463714A (en) * 2009-01-09 2009-06-24 西南石油大学 Foam cyclic utilization method used for under balance drilling
CN101871330A (en) * 2010-07-20 2010-10-27 西南石油大学 Foam cyclic utilization method by utilizing low carbon alcohol to realize foam drilling
CN101885960A (en) * 2010-07-20 2010-11-17 西南石油大学 Alcohol defoaming agent used in method for recycling foams of foam drilling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WAN, LIPING ET AL.: "RESEARCH PROGRESS OF RECIRCULATING UTILIZATION OF FOAM DRILLING FLUIDS", DRILLING & PRODUCTION TECHNOLOGY, January 2010 (2010-01-01), pages 76 - 77 *

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