Supramolecular fracturing fluid system for imbibition oil recovery and application of supramolecular fracturing fluid system for imbibition oil recovery

A supramolecular and fracturing fluid technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high temperature resistance and shear resistance, difficult handling of fracturing flowback fluid, strong heterogeneity, etc. problems, to achieve the effect of increasing temperature resistance and shear resistance, improving sand-carrying capacity of joint making, and reducing interfacial tension

Active Publication Date: 2020-01-03
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • 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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  • Supramolecular fracturing fluid system for imbibition oil recovery and application of supramolecular fracturing fluid system for imbibition oil recovery
  • Supramolecular fracturing fluid system for imbibition oil recovery and application of supramolecular fracturing fluid system for imbibition oil recovery
  • Supramolecular fracturing fluid system for imbibition oil recovery and application of supramolecular fracturing fluid system for imbibition oil recovery

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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 application of the supramolecular fracturing fluid system for imbibition oil recovery. The supramolecular fracturing fluid system for imbibition oil recovery is composed of the following components in percentage by weight: 0.2-0.7% of a supramolecular fracturing fluid thickener, 0.05-0.6% of a double-effect agent, 0.05-2% of a clay stabilizer, 0.05-0.4% of an efficient gel breaker and the balance water. The produced supramolecular fracturing fluid system for imbibition oil recovery is used for imbibition oil recovery work of a low-permeability tight oil reservoir, not only can the produced supramolecular fracturing fluid system for imbibition oil recovery be used as fracturing fluid for fracture forming and sand carrying, but also gel breaking liquid of the produced supramolecular fracturing fluid system for imbibition oil recovery can be used as imbibition liquid for changing the wettability of a reservoir matrix and reducing oil-water interfacial tension, and when imbibition oil recovery is conducted on the reservoir, through a method of combining fracturing and imbibition, not only is the imbibition recovery efficiency of the low-permeability tight oil reservoir improved, but also the problems that fracturing flow-back fluid is hard to treat, the recycling rate is low, and resources are wasted are solved.

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 Applications(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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