Strong-inhibition and strong-cementation well wall stabilizer and preparation method thereof

A technology of wellbore stabilizer and strong inhibition, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor cementing quality, difficult to achieve wellbore stability, high cost, etc., and achieve convenient control of the preparation process , Good wellbore stabilization effect, stable product quality effect

Inactive Publication Date: 2018-11-23
中石化石油工程技术服务有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although oil-based drilling fluid can effectively stabilize the borehole wall, it has problems such as high cost, unfriendly to the environment, and poor cementing quality
At present, there is no water-based drilling fluid system that can completely inhibit the hydration of clay, so it cannot effectively solve the problem of wellbore instability, and cannot replace oil-based drilling fluid to meet the needs of complex geological conditions and unconventional oil and gas reservoir drilling
[0003] Studies have shown that the instability of shale wellbore is the result of multi-factor and multi-field coupling of "mechanics-chemistry". Conventional drilling fluid treatment agents often focus on chemical factors, that is, to reduce the chemical interaction between drilling fluid and formation. Ignoring the mechanical factors and the synergistic effect between force and transformation, it is difficult to achieve real wellbore stability

Method used

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  • Strong-inhibition and strong-cementation well wall stabilizer and preparation method thereof
  • Strong-inhibition and strong-cementation well wall stabilizer and preparation method thereof
  • Strong-inhibition and strong-cementation well wall stabilizer and preparation method thereof

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Effect test

Embodiment 1

[0038] Embodiment 1: a kind of strong inhibition that the present invention mentions, strong cementation well wall stabilizer and preparation method thereof, comprises the following steps:

[0039] 3,4-dihydroxyphenylpropionic acid (2.65g, 14.5mmol) was dissolved in 5mL of DMF, and added to 10mL of 50% EDC (5.55g, 29mmol) in methanol solution to activate for half an hour. Branched PEI (Mw=25k) (5 g, 29 mmol) was dissolved in 10 mL of methanol solution, then added dropwise into the activated mixed solution, and stirred for 12 h. The product was purified twice by precipitation with ether, dialyzed in hydrochloric acid with a pH of 4 for two days, dialyzed in deionized water for 2 hours (molecular weight cut-off: 10,000), and freeze-dried. Then it was added to 196 mL of 0.2 mol / L phosphate buffer solution (pH 8), and the concentration of PEI-C in the final system was adjusted to 1 mg / mL. The solution was maintained for 24 hours to make it fully cross-linked, and then it was dial...

Embodiment 2

[0071] Embodiment 2: a kind of strong inhibition mentioned in the present invention, strong cementation well wall stabilizer and preparation method thereof, comprises the following steps:

[0072] 3,4-Dihydroxyphenylacetic acid (2.65g, 14.5mmol) was dissolved in 5mL of DMF, and added to 10mL of 50% N-hydroxysuccinimide (NHS) (5.55g, 29mmol) methanol solution to activate half an hour. Branched (polyethyleneimine) PEI (Mw=25k) (5g, 29mmol) was dissolved in 10mL of methanol solution, then added dropwise to the activated mixed solution, and stirred for 12h. The product was purified twice by precipitation with ether, dialyzed in formic acid with a pH of 4 for two days, dialyzed in deionized water for 2 hours (molecular weight cut-off: 10,000), and freeze-dried. Then it was added to 196 mL of 0.2 mol / L borate buffer solution (pH 8), and the concentration of PEI-C in the final system was adjusted to 1 mg / mL. The solution was maintained for 24 hours to make it fully cross-linked, an...

Embodiment 3

[0073] Embodiment 3: a kind of strong inhibition that the present invention mentions, strong cementation well wall stabilizer and preparation method thereof, comprises the following steps:

[0074] 3,4-dihydroxybenzoic acid (2.65 g, 14.5 mmol) was dissolved in 6 mL of ethanol, and added to 10 mL of 51% 2-(N-morpholine)ethanesulfonic acid monohydrate (MES) (5.55 g, 29mmol) in methanol solution for half an hour. Branched (polyethyleneimine) PEI (Mw=25k) (5g, 29mmol) was dissolved in 10mL of methanol solution, then added dropwise to the activated mixed solution, and stirred for 12h. The product was purified twice by precipitation with ether, dialyzed in chloroform with a pH of 4 for two days, dialyzed in deionized water for 2 hours (molecular weight cut-off: 10,000), and freeze-dried. Then it was added to 196 mL of 0.2 mol / L tris buffer solution (pH 8), and the concentration of PEI-C in the final system was adjusted to 1 mg / mL. The solution was maintained for 24 hours to make i...

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Abstract

The invention relates to a strong-inhibition and strong-cementation well wall stabilizer and a preparation method thereof. The strong-inhibition and strong-cementation well wall stabilizer is characterized by containing a branched polyethyleneimine structure as a main chain and a catechol group grafted to the main chain. The strong-inhibition and strong-cementation well wall stabilizer has the beneficial effects that the strong-inhibition and strong-cementation well wall stabilizer has better well wall stabilization effect, is convenient in control on preparation process, simple to operate andstable in quality of a product and has better action effect when being used under the condition with the temperature being 150 DEG C, and a water-based drilling fluid system formed by taking strong-inhibition and strong-cementation well wall stabilizer as a key treating agent has relatively good rheological property, rejection capability and anti-sloughing property; and a drilling fluid treatingagent which can strongly inhibit hydration swelling of shales, can block consolidated rocks at the same time, improves the mechanical property of the shales and strengthens the pressure-bearing capacity of the well wall can effectively push a water-based drilling fluid to replace an oil-based drilling fluid, more efficiently keeps the well wall stablity and has an important theoretical and practical significance.

Description

technical field [0001] The invention relates to a well wall stabilizer for drilling fluid in the oil drilling process, in particular to a well wall stabilizer with strong inhibition and strong cementation and a preparation method thereof. Background technique [0002] As the country's demand for oil and gas resources continues to expand, and the number of deep wells, ultra-deep wells and shale gas wells under complex formation conditions continues to increase, the performance of drilling fluids must be able to meet more stringent requirements. Among them, the wellbore stability problem has always been a worldwide problem in the drilling process. Downhole complexities and accidents caused by wellbore instability, such as well collapse, reduced diameter sticking, and bit balling, have caused a large amount of economic losses to the petroleum industry every year. . In order to solve the problem of wellbore stability, oil-based drilling fluid and high-performance water-based dr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C08G73/04
CPCC08G73/0206C09K8/24
Inventor 郭保雨邱正松王旭东钟汉毅王宝田汤志川赵欣陈二丁蒋莉赵红香李蕾刘均一王伟石亚男刘学明
Owner 中石化石油工程技术服务有限公司
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