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Liquid and supercritical carbon dioxide tackifying switch surfactant and compounding system thereof

A technology of surfactant and switch surface, applied in the field of switch surfactant and its compound system, can solve the problems of low efficiency of tackifier, great formation damage, environmental pollution, etc., and achieve the effect of improving tackifier effect

Inactive Publication Date: 2018-11-02
成都菲尔特技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The object of the present invention is to aim at LCO in the prior art 2 with scCO 2 The fracturing fluid system has problems such as low viscosity, low viscosifier efficiency, high system friction, and difficult recycling of viscosifier components, resulting in high fracturing costs, environmental pollution and formation damage. Supercritical carbon dioxide viscosity-increasing switching surfactant and its compound system

Method used

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  • Liquid and supercritical carbon dioxide tackifying switch surfactant and compounding system thereof
  • Liquid and supercritical carbon dioxide tackifying switch surfactant and compounding system thereof
  • Liquid and supercritical carbon dioxide tackifying switch surfactant and compounding system thereof

Examples

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Effect test

Embodiment 1

[0033] The switch surfactant polyoxyethylene alkylamine is used as the tackifier, and the structural formula of the polyoxyethylene alkylamine is as follows:

[0034]

[0035] Among them, R 2 , R 3 It is a long-chain alkyl group containing 10 carbon atoms, and y is 3. The polyoxyethylene alkylamine is added into liquid carbon dioxide to obtain a fracturing fluid system. In the fracturing fluid system, the mass percentage of polyoxyethylene alkylamine is 5%, and the rest is liquid carbon dioxide. The desired viscosification effect can be obtained after the fracturing fluid system is fully stirred. At room temperature, the viscosity reaches 0.11mPa.s at 7MPa. figure 1 is the change curve of the viscosity of the liquid carbon dioxide system with the shear time in this embodiment. figure 2 It is the relationship diagram between the displacement of the liquid carbon dioxide system and the drag coefficient in this embodiment. It can be seen from the figure that the viscosi...

Embodiment 2

[0037]In this embodiment, a complex system of switching surfactant polyoxyethylene alkylamine and tackifying polymer is used as the tackifier, wherein the specific structure of polyoxyethylene alkylamine is the same as in Example 1, and the tackifying polymer It is polyether modified polysiloxane. The compound system is added into liquid carbon dioxide to obtain a fracturing fluid system. In the fracturing fluid system, the mass percentage of polyoxyethylene alkylamine is 2%, the mass percentage of viscosifying polymer is 0.5%, and the rest is liquid carbon dioxide. The desired viscosification effect can be obtained after the fracturing fluid system is fully stirred. At room temperature, the viscosity reaches 0.27mPa.s at 7MPa. image 3 is the change curve of the viscosity of the liquid carbon dioxide system with the shear time in this embodiment. Figure 4 It is the relationship diagram between the displacement of the liquid carbon dioxide system and the drag coefficient i...

Embodiment 3

[0039] In this embodiment, a complex system of switching surfactant polyoxyethylene alkylamine and tackifying polymer is used as the tackifier, wherein the specific structure of polyoxyethylene alkylamine is the same as in Example 1, and the tackifying polymer It is polyether modified polysiloxane. The compound system is added into liquid carbon dioxide to obtain a fracturing fluid system. In the fracturing fluid system, the mass percentage of polyoxyethylene alkylamine is 2%, the mass percentage of viscosifying polymer is 2%, and the rest is liquid carbon dioxide. The desired viscosification effect can be obtained after the fracturing fluid system is fully stirred. At room temperature, the viscosity reaches 0.48mPa.s at 7MPa.

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Abstract

The invention discloses a liquid and supercritical carbon dioxide tackifying switch surfactant and a compounding system thereof. The switch surfactant is a nonionic surfactant with a tertiary amine group; the switch surfactant is a polyhydric alcohol type or polyoxyethylene type nonionic surfactant with the tertiary amine group. The compounding system which is prepared on the basis of the switch surfactant and is applied to liquid and supercritical carbon dioxide tackifying comprises the switch surfactant and a tackifying polymer; the tackifying polymer is a long-chain fatty acid or a polyester with at least one of groups of amino, ether and alcoxyl, or polysiloxane which is modified by using at least one of groups of amino, polyether, acrylic acid, aryl and alkyl. According to the switchsurfactant, inverse phase wormlike micelle tackifying can be achieved, the hydrophilcity of the switch surfactant is improved through protonation of the tertiary amine, flowback can be achieved, finally recycling and repeated use of the surfactant can be achieved through deprotonation, and the fracturing cost can be reduced.

Description

technical field [0001] The invention belongs to the field of chemicals for petroleum and natural gas development and production increase, and in particular relates to a switching surfactant and a compounding system for liquid and supercritical carbon dioxide thickening. Background technique [0002] Waterless fracturing technology uses non-aqueous base fluid as the fracturing medium to perform rock fracturing, realize oil and gas development or increase production. Liquid carbon dioxide (LCO 2 ) and supercritical carbon dioxide (scCO 2 ) waterless fracturing technology will gradually become the core technology of unconventional oil and gas exploitation in the foreseeable future due to its incomparable technical advantages of conventional fracturing, such as good production stimulation effect, no damage to reservoirs and protection of water resources. This technology is a combination of proppants such as natural sand, resin-coated sand or high-strength ceramics and LCO 2 T...

Claims

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Application Information

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IPC IPC(8): C09K8/68C09K8/88C09K8/584
CPCC09K8/584C09K8/68C09K8/885Y02P20/54
Inventor 张宁康鲁红升戴姗姗黄志宇张天航
Owner 成都菲尔特技术开发有限公司
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