An organic salt drilling fluid

An organic salt and drilling fluid technology, applied in the field of organic salt drilling fluid, can solve the problems of strong water sensitivity and unsatisfactory sealing performance of organic salt drilling fluid, and achieve low filtration loss, prevention of sticking, and strong lubrication performance. Effect

Active Publication Date: 2018-06-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the well-developed fractures and strong water sensitivity of shale gas and shale formations, the plugging performance of ordinary organic salt drilling fluids is still not satisfactory.

Method used

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  • An organic salt drilling fluid

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Experimental program
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Effect test

Embodiment 1

[0034] The organic salt drilling fluid provided by the present invention includes 1% bentonite, 0.3% sodium carbonate, 0.5% sodium hydroxide, 0.3% xanthan gum, 2% fluid loss agent, 2% nano sealant Plugging agent, 1% sulfonated asphalt, 0.5% lubricant, 40% sodium formate and 100% barite powder.

[0035] The preparation method of the fluid loss control agent is as follows:

[0036] Add 5 parts of acrylamide, 5 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked flask equipped with a mechanical stirrer. After stirring to dissolve, add an appropriate amount of NaOH to adjust the pH of the aqueous solution to 9, and then add After 15 parts of N-isopropylacrylamide is completely dissolved, under the protection of nitrogen, slowly add 0.05 parts of ammonium persulfate and 0.05 parts of potassium persulfate, heat and react at 60°C for 6 hours to obtain a glue solution, and then dry , Pulverize to obtain the fluid loss control agent.

[0037] The preparation meth...

Embodiment 2

[0043] The organic salt drilling fluid provided by the present invention includes 4% bentonite, 0.5% sodium carbonate, 1% sodium hydroxide, 1% xanthan gum, 8% fluid loss agent, and 5% nano sealant. Plugging agent, 2% sulfonated asphalt, 1% oxidized asphalt, 1% natural asphalt, 40% sodium formate, 20% potassium formate and 200% barite powder.

[0044] The preparation method of the fluid loss control agent is as follows:

[0045] Add 10 parts of acrylamide, 15 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked flask equipped with a mechanical stirrer. After stirring to dissolve, add appropriate amount of NaOH to adjust the pH of the aqueous solution to 11, and then add After 35 parts of N-isopropylacrylamide is completely dissolved, under the protection of nitrogen, slowly add 0.5 parts of azobisisobutyronitrile and 0.5 parts of azobisisoheptonitrile, and heat and react at 80°C for 4 hours to obtain The glue solution is then dried and crushed to obtain t...

Embodiment 3

[0052] The organic salt drilling fluid provided by the present invention includes water and 3% bentonite, 0.3% sodium carbonate, 0.8% sodium hydroxide, 0.5% xanthan gum, and 5% filter reduction based on the volume of water. Loss agent, 4% nano-blocking agent, 1% emulsified asphalt, 1% oxidized asphalt, 1% natural asphalt, 40% sodium formate, 20% cesium formate and 150% ilmenite powder.

[0053] The preparation method of the fluid loss control agent is as follows:

[0054] Add 5 parts of acrylamide, 5 parts of N-vinylpyrrolidone, 5 parts of 2-acrylamide-2 methylpropanesulfonic acid and 100 parts of deionized water into a four-necked flask equipped with a mechanical stirrer. After stirring and dissolving, Add appropriate amount of NaOH to adjust the pH value of the aqueous solution to 10, and then add 30 parts of N-isopropylacrylamide, after completely dissolved, under the protection of nitrogen, slowly add 0.05 parts of ammonium persulfate and 0.5 parts of azobisiso The butyl amidi...

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Abstract

The invention discloses organic salt drilling fluid. The organic salt drilling fluid is prepared from 1%-4% of bentonite, 0.3%-0.5% of sodium carbonate, 0.5%-1% of sodium hydroxide, 0.3%-1% of xanthan gum, 2%-8% of a filtrate loss reducer, 2%-5% of a nanometer blocking agent, 1%-4% of a blocking agent, 0.5%-4% of a lubricating agent, 40%-60% of organic salt and 25%-250% of an inert weighting agent, wherein the nanometer blocking agent is prepared by copolymerizing methacrylic acid carbomethoxy cage-like oligomeric silsesquioxane, N-isopropylacrylamide and acrylamide, and the lubricating agent is prepared by compounding castor oil polyoxyethylene ether, polyethylene glycol and polyvinyl pyrrolidone. The organic salt drilling fluid has the very good heat stability, the low filtration loss and the high blocking performance and lubricating performance and is especially suitable for shale gas well development.

Description

Technical field [0001] The invention relates to the field of petroleum and natural gas, in particular to an organic salt drilling fluid. Background technique [0002] With the development of the domestic and international petroleum industry and the increasing demand for petroleum, the development and utilization of shale gas has gradually increased. At present, the exploitation of shale gas mainly uses oil-based drilling fluid. Oil-based drilling fluid has strong plugging properties and good lubricity, and is widely used in the exploration and development of shale gas wells. However, oil-based drilling fluids have problems such as high cost and pollution to the formation and the environment. If ordinary water-based drilling fluids are used, due to the well-developed shale formation fractures and strong water sensitivity, contact with water-based drilling fluids can easily cause leakage and collapse. In addition, due to the long horizontal well section in shale gas drilling, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/24C09K8/035
CPCC09K8/035C09K8/24C09K2208/10C09K2208/12C09K2208/34
Inventor 张民立龙涛张坤田增艳王磊磊李广环王红芳周光正李毅峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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