A supramolecular fracturing fluid system for imbibition recovery and its application

A supramolecular and fracturing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of intractable fracturing flowback fluid, temperature resistance and shear resistance to be improved, and poor temperature resistance. , to achieve the effect of improving the sand-carrying capacity of the fracture, increasing the temperature resistance and shear resistance, and improving the imbibition recovery rate.

Active Publication Date: 2022-03-29
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of low-permeability reservoirs is very difficult, and the general recovery level is 5-28%, with an average level of 13.6%.
Compared with conventional reservoirs, the common problems in the development of low-permeability tight oil reservoirs are low formation pressure, low energy, low porosity, low permeability, and strong heterogeneity. Effect
In addition, conventional fracturing fluids have traditional guar gum with high friction resistance and many residues; large amount of VES, high cost and poor temperature resistance; chemical cross-linked polymer system, difficult to control the cross-linking process, temperature resistance and shear resistance Issues waiting to be improved
At the same time, the fracturing flowback fluid is difficult to handle, the recycling rate is low, and resources are wasted

Method used

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  • A supramolecular fracturing fluid system for imbibition recovery and its application
  • A supramolecular fracturing fluid system for imbibition recovery and its application
  • A supramolecular fracturing fluid system for imbibition recovery and its application

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Embodiment

[0051]A supramolecular fracturing fluid system for imbibition oil recovery, based on its total weight as 100%, it includes: 0.4% supramolecular thickener (hydrophobic association polymer, CFZ-4, Sichuan Guangya Polymer Chemical Co., Ltd. company), 0.2% double-effect agent (betaine zwitterionic surfactant, CY-4, Shanghai Jianhong Industrial Co., Ltd.), 0.85% clay stabilizer (quaternary ammonium salt organic clay stabilizer class, GY- 1, Sichuan Guangya Polymer Chemical Co., Ltd.), 0.15% gel breaker (ammonium persulfate, PJ-1, Chengdu Kelong Chemical Reagent Factory) and the rest of the water.

[0052] Preparation method: Dissolve supramolecular fracturing fluid thickener CFZ-4 in water for 5-10 minutes, add clay stabilizer GY-1 and dual-effect agent CY-4 in proportion, stir for 5-10 minutes, then add gel breaker PJ -1 to obtain the supramolecular fracturing fluid system for imbibition recovery of the present invention.

Embodiment 1

[0068] A supramolecular fracturing fluid system for imbibition oil recovery, based on its total weight as 100%, it includes: 0.2% supramolecular thickener (hydrophobic association polymer, CFZ-1, Sichuan Guangya Polymer Chemical Co., Ltd. company), 0.05% double-effect agent (fluorocarbon surfactant, CY-1, Shanghai Jianhong Industrial Co., Ltd.), 0.05% clay stabilizer (quaternary ammonium salt organic clay stabilizer, GY-1, Sichuan Guangya Polymer Chemical Co., Ltd.), 0.05% high-efficiency gel breaker (ammonium persulfate, PJ-1, Chengdu Kelong Chemical Reagent Factory) and the rest of the water.

[0069] Preparation method: Dissolve supramolecular fracturing fluid thickener CFZ-1 in water for 5-10 minutes, add clay stabilizer GY-1 and dual-effect agent CY-1 in proportion, stir for 5-10 minutes, then add gel breaker PJ -1 to obtain the supramolecular fracturing fluid system for imbibition recovery of the present invention.

Embodiment 2

[0071] A supramolecular fracturing fluid system for imbibition oil recovery, based on its total weight as 100%, it includes: 0.7% supramolecular thickener (hydrophobic association polymer, CFZ-2, Sichuan Guangya Polymer Chemical Co., Ltd. company), 0.6% double-effect agent (sulfonate anionic surfactant, CY-2, Evonik Specialty Chemicals (Shanghai) Co., Ltd.), 2% clay stabilizer (potassium chloride, KCl, Chengdu Kelon Chemical Reagent Factory), 0.4% gel breaker (capsule gel breaker, PJ-2, Shaanxi Senrui Petroleum Technology Development Co., Ltd.) and the rest of the water.

[0072] Preparation method: Dissolve supramolecular fracturing fluid thickener CFZ-2 in water for 5-10 minutes, then add clay stabilizer KCl and dual-effect agent CY-2 in proportion, stir for 5-10 minutes, then add capsule breaker PJ- 2. Obtain the supramolecular fracturing fluid system for imbibition oil recovery described in the present invention.

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Abstract

The invention discloses a supramolecular fracturing fluid system for imbibition oil recovery and its application. The supramolecular fracturing fluid system for imbibition oil recovery is composed of the following components in weight percentage: 0.2-0.7% supramolecular fracturing Liquid thickener, 0.05-0.6% double effect agent, 0.05-2% clay stabilizer, 0.05-0.4% high-efficiency gel breaker and the rest of water. The imbibition recovery supramolecular fracturing fluid system prepared by the present invention is used for imbibition recovery in low-permeability tight oil reservoirs. The wettability of the reservoir matrix can be reduced to reduce the oil-water interfacial tension, and the imbibition oil recovery can be carried out in the reservoir. The method of combining fracturing and imbibition not only improves the imbibition recovery of low-permeability tight oil reservoirs, but also solves the problem of fracturing. The flowback liquid is difficult to handle, the recycling rate is low, and resources are wasted.

Description

technical field [0001] The invention relates to a supramolecular fracturing fluid system for imbibition oil recovery and its application, and belongs to the technical field of oil and gas field imbibition oil recovery development. Background technique [0002] In recent years, due to the increasing demand for oil and gas resources worldwide, low-permeability tight oil and gas resources have become an indispensable and important part of the global energy structure, and their status has become increasingly prominent. my country's low-permeability reservoirs are very rich in resources, ultra-low permeability (class II 1-10md, class III 0.1-1md) accounts for more than 58%, and there are more than 300 oil fields. However, the development of low-permeability reservoirs is very difficult, and the general recovery level is 5-28%, with an average level of 13.6%. Compared with conventional reservoirs, the common problems in the development of low-permeability tight oil reservoirs are...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/68
CPCC09K8/602C09K8/608C09K8/665C09K8/68C09K8/882C09K2208/26C09K2208/12
Inventor 郭拥军林凌许成军张新民熊亚春蒲迪刘宽
Owner SOUTHWEST PETROLEUM UNIV
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