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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 unsatisfactory plugging performance and strong water sensitivity of organic salt drilling fluid, and achieve pipe sticking prevention, low fluid loss and strong lubricating performance Effect

Active Publication Date: 2016-06-22
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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  • Organic salt drilling fluid

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Effect test

Embodiment 1

[0034] A kind of organic salt drilling fluid provided by the present invention comprises 1% bentonite, 0.3% sodium carbonate, 0.5% sodium hydroxide, 0.3% xanthan gum, 2% fluid loss control agent, 2% nano-seal Plugging agent, 1% sulfonated bitumen, 0.5% lubricant, 40% sodium formate and 100% barite powder.

[0035] The preparation method of described fluid loss reducer is as follows:

[0036] Add 5 parts of acrylamide, 5 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked bottle equipped with a mechanical stirrer. After stirring and dissolving, add an appropriate amount of NaOH to adjust the pH value 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 glue, and then dry it , pulverized to obtain the fluid loss control agent.

[0037...

Embodiment 2

[0043] A kind of organic salt drilling fluid provided by the invention comprises 4% bentonite, 0.5% sodium carbonate, 1% sodium hydroxide, 1% xanthan gum, 8% fluid loss control agent, 5% nano-seal Plugging agent, 2% sulfonated bitumen, 1% oxidized bitumen, 1% natural bitumen, 40% sodium formate, 20% potassium formate and 200% barite powder.

[0044] The preparation method of described fluid loss reducer is as follows:

[0045]Add 10 parts of acrylamide, 15 parts of N-vinylpyrrolidone and 100 parts of deionized water into a four-necked bottle equipped with a mechanical stirrer. After stirring and dissolving, add an appropriate amount of NaOH to adjust the pH value 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 azobisisoheptanonitrile, and heat at 80°C for 4 hours to obtain The glue solution is then dried and pulverized ...

Embodiment 3

[0052] A kind of organic salt drilling fluid provided by the present invention comprises water and 3% bentonite, 0.3% sodium carbonate, 0.8% sodium hydroxide, 0.5% xanthan gum, 5% down filter loss agent, 4% nano plugging agent, 1% emulsified bitumen, 1% oxidized bitumen, 1% natural bitumen, 40% sodium formate, 20% cesium formate and 150% ilmenite powder.

[0053] The preparation method of described fluid loss reducer 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 bottle equipped with a mechanical stirrer, and stir to dissolve, Add an appropriate amount of NaOH to adjust the pH value of the aqueous solution to 10, then add 30 parts of N-isopropylacrylamide, after it is completely dissolved, slowly add 0.05 parts of ammonium persulfate and 0.5 parts of azobisiso Butylamidine dihydrochloride was heated and reacted at 70°C for 7 hours to obta...

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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 petroleum industry at home and abroad 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 sealing and lubricating properties, and is widely used in the exploration and development of shale gas wells. However, oil-based drilling fluid has problems such as high cost, formation and environmental pollution. If ordinary water-based drilling fluid is used, due to the well-developed fractures and strong water sensitivity in the shale formation, contact with water-based drilling fluid will easily cause well leakage and collapse. In addition, in shale gas drilling, due to the long horizontal well section, To solve prob...

Claims

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Application Information

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Patent Type & Authority Applications(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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