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Hyperbranched polymer plugging type anti-collapse agent, water-based drilling fluid containing hyperbranched polymer plugging type anti-collapse agent and preparation

A technology of hyperbranched polymer and water-based drilling fluid, which is applied in the preparation of organic compounds, the preparation of cyanide reaction, the composition of drilling holes, etc., to achieve the effects of good compatibility, low price and convenient use

Active Publication Date: 2022-07-19
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

[0005] Aiming at the shortcoming that current plugging agents are difficult to adapt to micro-fractures, the present invention provides a hyperbranched polymer plugging anti-slump agent and water-based drilling fluid containing it and its preparation to effectively plug micro-nano pores and fractures in shale formations , form a dense mud cake, prevent pressure transmission and filtrate intrusion, overcome the wellbore instability problem caused by using water-based drilling fluid to drill shale formations, and realize the use and promotion of water-based drilling fluid

Method used

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  • Hyperbranched polymer plugging type anti-collapse agent, water-based drilling fluid containing hyperbranched polymer plugging type anti-collapse agent and preparation
  • Hyperbranched polymer plugging type anti-collapse agent, water-based drilling fluid containing hyperbranched polymer plugging type anti-collapse agent and preparation
  • Hyperbranched polymer plugging type anti-collapse agent, water-based drilling fluid containing hyperbranched polymer plugging type anti-collapse agent and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The present embodiment prepares a hyperbranched polymer plugging and anti-slump agent, comprising the following steps:

[0049] (1) Weigh 26.418g of ornithine and dissolve it in 160mL of a mixed solvent of methanol and water (volume ratio is 1:1), and transfer it to a three-necked flask with a thermometer, a mechanical stirring device and continuous nitrogen flow, and then add 19.8216g ethylene glycol dimethacrylate was stirred and refluxed for 16h at 105°C. After the reaction was completed, the solvent was removed by rotary evaporation (vacuum degree -0.09MPa) at 50°C until no liquid dripped within 5min to obtain a crude solution. Product A1.

[0050] (2) The crude product A1 is washed 3 to 4 times with methanol whose volume is 5-10 times the volume of A1 in a pear-shaped separatory funnel to remove the milky white viscous substance. Rotary evaporation at 40°C (vacuum degree - 0.09MPa) to remove methanol until no liquid drips within 5 min to obtain a bright yellow visco...

Embodiment 2

[0053] The present embodiment changes the raw material dosage ratio on the basis of Example 1, comprising the following steps:

[0054] (1) Dissolve 13.2090g of ornithine in 80mL of a mixed solvent of methanol and water (volume ratio is 1:1), and transfer it to a three-necked flask with a thermometer, a mechanical stirring device and continuous nitrogen flow, and then add 19.8216g ethylene glycol dimethacrylate was stirred and refluxed for 16h at 105°C. After the reaction was completed, the solvent was removed by rotary evaporation (vacuum degree -0.09MPa) at 50°C until no liquid dripped within 5min to obtain a crude solution. Product A2.

[0055] (2) The crude product A2 is washed 3 to 4 times with methanol whose volume is 5-10 times the volume of A2 in a pear-shaped separatory funnel to remove the milky white viscous substance. Rotary evaporation at 40° C. (vacuum degree-0.09MPa) to remove methanol until no liquid drips within 5 min to obtain a bright yellow viscous product...

Embodiment 3

[0060] In this example, the performance test of the hyperbranched polymer plugging anti-slump agent obtained in Example 2 is carried out.

[0061] In order to further illustrate the plugging effect of the hyperbranched polymer plugging anti-slump agent of the present invention, in this example, after compounding the plugging agent with the drilling fluid base slurry, the rheological properties and high temperature fluid loss properties were tested to illustrate the The blocking effect of the present invention.

[0062] 1. Preparation of water-based drilling fluid base slurry

[0063] 1) Bentonite pre-hydration treatment, the specific method is as follows: measure 10L of tap water, heat up to 65 ° C, under the condition of low-speed stirring, add 500g bentonite, after stirring for 10min, add 25g Na 2 CO 3 , stirred for 30min, sealed and let stand for 24h to obtain pre-hydrated bentonite slurry.

[0064] 2) Take 400mL of the pre-hydrated bentonite slurry prepared in step 1) i...

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Abstract

The invention discloses a hyperbranched polymer plugging type anti-collapse agent, a water-based drilling fluid containing the same and preparation of the water-based drilling fluid. The hyperbranched polymer plugging type anti-collapse agent is obtained by taking ornithine and ethylene glycol dimethacrylate as raw materials through Michael addition reaction. The hyperbranched polymer plugging type anti-collapse agent has the molecular particle size of 20-80 nm, meets the effective plugging requirements of shale formation nanometer micropore gaps, can form a compact mud cake, effectively prevents pressure transmission and filtrate invasion, enhances shale formation well wall stability, and effectively slows down well wall collapse.

Description

technical field [0001] The invention relates to the technical field of oil and natural gas drilling fluids, in particular to a hyperbranched polymer plugging anti-slump agent and a water-based drilling fluid containing the same and its preparation. Background technique [0002] With the rapid development of the world economy, energy consumption shows a trend of continuous growth. At present, oil and gas is still the most important type of primary energy in the world. China is rich in shale gas resources and has good exploration and development prospects, but there are still huge challenges in large-scale exploration and development, mainly because horizontal well drilling technology is the core technology of shale gas exploration and development. The direct impact is the technical problems such as borehole instability and lost circulation in the horizontal well section, which greatly restricts the drilling and development of shale gas resources in my country. [0003] Shale...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/22C07C229/26C07C227/10
CPCC09K8/035C09K8/22C07C229/26Y02P20/141
Inventor 屈沅治谢刚程荣超肖玉容王韧邓明毅黄宏军蒲俊杨峥张雁
Owner BC P INC CHINA NAT PETROLEUM CORP
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