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Composite emulsifier for ultrahigh-temperature-resistant water-in-oil emulsion drilling fluid and drilling fluid

A technology for emulsified drilling fluid and compound emulsifier, applied in the field of petroleum drilling engineering, can solve the problems of less research, settlement stability and rheological property control of water-in-oil emulsion drilling fluid performance, emulsification stability, settlement stability and filtration. In order to improve the strength of the interface membrane, improve the settlement stability of the system and the filtration performance of drilling fluid, improve the settlement stability and the filtration performance of high temperature and high pressure

Active Publication Date: 2021-11-16
中国石油集团西部钻探工程有限公司青海钻井公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But for a long time, the emulsification stability and settlement stability of water-in-oil emulsified drilling fluid under high temperature conditions, the settlement stability and rheological properties under high density conditions Controlling etc. has always been a technical problem restricting the performance of water-in-oil emulsion drilling fluid
Especially when ultra-high temperature (220°C-240°C) and high density (2.3g / cm3-2.45g / cm3) are required at the same time, the emulsification of the system is stable There is a problem that it is difficult to balance the control of fluidity, settlement stability and fluid loss performance. At present, there are few researches on ultra-high temperature and high density water-in-oil emulsified drilling fluid.

Method used

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  • Composite emulsifier for ultrahigh-temperature-resistant water-in-oil emulsion drilling fluid and drilling fluid
  • Composite emulsifier for ultrahigh-temperature-resistant water-in-oil emulsion drilling fluid and drilling fluid
  • Composite emulsifier for ultrahigh-temperature-resistant water-in-oil emulsion drilling fluid and drilling fluid

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Experimental program
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Effect test

preparation example Construction

[0089] The present invention also provides a preparation method of the ultra-high temperature resistant water-in-oil emulsified drilling fluid, specifically, comprising the following steps:

[0090] S1. Add organic soil, main emulsifier, auxiliary emulsifier, emulsion stabilizer, cutting agent and acid-base regulator to the oil phase in sequence, stir at high speed to make it fully dispersed, and stir for 5 minutes after adding each component Add the next one, the high-speed stirring rate is 11000r / min;

[0091] S2. Continue to add the water phase under high-speed stirring conditions to fully emulsify the system. The high-speed stirring time is not less than 10 minutes, and the high-speed stirring rate is 11000r / min;

[0092] S3. Add fluid loss reducer, ultrafine particles and weighting agent in sequence. After each component is added, it must be stirred for 5 minutes before adding the next one. The stirring rate is 11000r / min. The resulting mixed liquid is water-in-oil emulsi...

Embodiment 1

[0096] Embodiment 1 Effect evaluation of compound emulsifier

[0097] The volume ratio of the oil phase (0# diesel oil) to the water phase (20Wt% calcium chloride aqueous solution) is 8:2, in terms of mass percentage, when adding 1.5% of the main emulsifier and 1% of the auxiliary emulsifier, the emulsion stabilizer (PEG-30 dipolyhydroxystearate) is added in an amount of 0%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.5%, and 2%, and the effects are shown in Table 1.

[0098] Table 1

[0099] Addition amount of emulsion stabilizer (Wt%) 0 0.2 0.4 0.6 0.8 1 1.5 2 Demulsification voltage (V) 213 302 388 468 495 508 515 519

Embodiment 2

[0100] Embodiment 2 The effect evaluation of compound emulsifier

[0101] The volume ratio of the oil phase (0# diesel oil) to the water phase (20Wt% calcium chloride aqueous solution) is 9:1, in terms of mass percentage, when adding 2% of the main emulsifier and 1% of the auxiliary emulsifier, the emulsion stabilizer (PEG-30 dipolyhydroxystearate) is added in an amount of 0%, 0.2%, 0.4%, 0.6%, 0.8%, 1%, 1.5%, and 2%, and the effects are shown in Table 2.

[0102] Table 2

[0103]

[0104]

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Abstract

The invention discloses a composite emulsifier for an ultrahigh-temperature-resistant water-in-oil emulsion drilling fluid and the drilling fluid, and the composite emulsifier comprises the following raw materials in parts by weight: 2.0-5.0 parts of a main emulsifier, 1.0-4.0 parts of an auxiliary emulsifier and 0.2-2 parts of an emulsion stabilizer. Under ultrahigh temperature and high density, the main emulsifier can form a close packing composite film with viscoelasticity on an oil-water interface of a drilling fluid system and can maintain the emulsion stability of the drilling fluid system, and the auxiliary emulsifier can reduce the tension of the oil-water interface, interact with the main emulsifier and assist the main emulsifier to improve the emulsion stability of the drilling fluid system. By adding the emulsion stabilizer, the strength of an interfacial film can be remarkably improved, and the emulsion stability of the water-in-oil emulsion drilling fluid is improved, so that the system sedimentation stability, the drilling fluid filtration loss and other properties are improved.

Description

Technical field [0001] The invention relates to the technical field of petroleum drilling engineering, specifically a composite emulsifier and drilling fluid for ultra-high temperature resistant water-in-oil emulsion drilling fluid. Background technique [0002] With the gradual development of formation exploration and development technology and the further development of oil and gas fields, drilling operations have begun to move into deeper and more complex formations, which has brought about a series of technical problems such as high temperature in deep wells, high formation pressure, and collapsed formations. In response to the above formation mining problems, water-in-oil emulsion drilling fluid is an important and excellent technical solution. It has a series of excellent properties such as excellent inhibition, salt resistance, good lubricity, and anti-pollution properties. [0003] However, for a long time, the emulsification stability and settlement stability of wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/36
CPCC09K8/36
Inventor 胡正文屈璠韦西海邓小刚林凌马丽华
Owner 中国石油集团西部钻探工程有限公司青海钻井公司
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