Composition used for preventing formation water lock and application thereof

A technology of composition and water lock, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve problems such as damage to oil and gas layers, reduction of production capacity, etc.

Inactive Publication Date: 2011-04-20
CHINA NAT OFFSHORE OIL CORP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the process of drilling, well completion, production, stimulation and other processes, due to the invasion of external water-containing working fluid and

Method used

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  • Composition used for preventing formation water lock and application thereof
  • Composition used for preventing formation water lock and application thereof
  • Composition used for preventing formation water lock and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example is used to illustrate the composition for preventing formation water lock provided by the present invention.

[0026] With 20 parts by weight of sodium perfluorooctane sulfonate, 20 parts by weight of the amphoteric geminal surfactant shown in the following structural formula 2, 100 parts by weight of octadecyl alcohol polyoxyethylene ether (polymerization degree is 20) and 180 Parts by weight of methanol are dissolved in 400 parts by weight of water, and the obtained homogeneous liquid is composition A1 for preventing formation water lock.

[0027] Structural formula 2

[0028]

Embodiment 2

[0030] This example is used to illustrate the composition for preventing formation water lock provided by the present invention.

[0031] The perfluorooctyl sodium carboxylate of 5 parts by weight, the amphoteric geminal surfactant shown in the following structural formula 3 of 30 parts by weight, the eicosyl alcohol polyoxyethylene ether (polymerization degree is 25) of 100 parts by weight and 180 Parts by weight of ethylene glycol are dissolved in 400 parts by weight of water, and the obtained homogeneous liquid is composition A2 for preventing formation water lock.

[0032] Structural formula 3

[0033]

Embodiment 3

[0035] This example is used to illustrate the composition for preventing formation water lock provided by the present invention.

[0036] The perfluorooctyl sodium carboxylate of 15 parts by weight, the sodium perfluorooctane sulfonate of 15 parts by weight, the amphoteric geminal surfactant shown in the following structural formula 4 of 5 parts by weight, the octadecanol of 100 parts by weight Polyoxyethylene ether (polymerization degree: 20) and 180 parts by weight of ethylene glycol butyl ether were dissolved in 400 parts by weight of water, and the obtained homogeneous liquid was composition A3 for preventing formation water lock.

[0037] Formula 4

[0038]

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PUM

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Abstract

The invention provides a composition for preventing formation water lock, which comprises a fluorocarbon surfactant, a zwitterionic gemini surfactant and class III surfactants, wherein the class III surfactants are nonionic surfactants with a formula of CnH2n+1C6H5(OCmH2m)xOH or CnH2n+1(OCmH2m)xOH, n is an integer of 8-20, m is an integer of 1-4, and x is an integer of 4-30. The invention also provides application of the composition to preventing the formation water lock. By adopting the composition for preventing the formation water lock, the interfacial tension between water and gas and between oil and water can be greatly reduced, and the wetting angle of water to the mineral surface is increased; meanwhile, the composition also has a certain oil-drive effect, thereby being capable of reducing capillary pressure of driving water by gas (oil) and effectively preventing the formation water lock.

Description

technical field [0001] The invention relates to a composition for preventing formation water lock and the application of the composition for preventing formation water lock. Background technique [0002] In the process of drilling, well completion, production, stimulation and other processes, the invasion of external water-containing working fluid and the redistribution of the initial water content of oil and gas layers may cause damage to oil and gas layers, resulting in a significant reduction in production capacity. The essence of water phase trap is that when the initial water saturation of the oil and gas reservoir is lower than the irreducible water saturation (also called immovable water saturation), it is in the "sub-restricted water state". Once the aqueous working fluid contacts the oil and gas layers, the formation When water from other parts of the reservoir enters the oil and gas layers, or condensate water accumulates near the oil and gas wells, the water satur...

Claims

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Application Information

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IPC IPC(8): C09K8/584
Inventor 郭士生闫波李三喜付豪孙琪陈玲玲王梦晨郭树彬马认琦赵战江郑延成王昌军赖燕玲
Owner CHINA NAT OFFSHORE OIL CORP
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