Method for temporarily plugging diversion fracturing by using salinity response type emulsion

A technology of emulsion and salinity, which is applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve the problems of difficult injection of diverting agents, weak plugging strength, and inability to migrate, and achieve low cost , good plugging performance and low cost

Pending Publication Date: 2021-06-04
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although CN106543996A discloses a water-in-oil emulsion prepared from calcium dodecylbenzenesulfonate and nanometer silicon dioxide as an acidifying temporary blocking diverting agent, the embodiments of this invention patent show that the diverting agent is used in high-speed shear Cut rate 121.86s -1 However, its viscosity is still as high as 88.31mPa.s. Therefore, the diverting agent is difficult to inject due to its high viscosity during the actual injection process on site. It can only be injected into fractures or high-permeability layers near the wellbore to form a plug near the wellbore. Unable to migrate to deep formations, the plugging strength is weak
CN109762543A discloses a temperature-resistant and salt-resistant self-adhesive emulsion temporary plugging acidification diver

Method used

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  • Method for temporarily plugging diversion fracturing by using salinity response type emulsion
  • Method for temporarily plugging diversion fracturing by using salinity response type emulsion
  • Method for temporarily plugging diversion fracturing by using salinity response type emulsion

Examples

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Example Embodiment

[0026] Example 1

[0027] Such as figure 1A salinity response type emulsion is used to temporarily block the steering fracturing, including the following steps:

[0028] Step 1, a salinity response type emulsion is prepared, and the salinity response type emulsion is characterized in that a heavy oil, a hydrophilic emulsifier, a hermitic emulsifier, and a liquid-free water; the salinity response type emulsion The mass fraction of 2,800 MPa · s thick oil at 60 ° C in the liquid is 24%, and the mass fraction of silicate lithium silicate nanoparticles and sodium sulfate is 0.4% and 0.4%, and magnesium magnesium nanoparticles and Division. The mass fraction of the disk 60 emulsifier is 0.5% and 0.3%, respectively, the mass fraction of water is 74.4%; the salinity response type emulsion is prepared includes the following steps:

[0029] Step 101, formulated a hydrophilic emulsifier aqueous solution, 74.4 g of water is added to the beaker at room temperature, and 0.4 g of magneson nanop...

Example Embodiment

[0042] Example 2

[0043] In this embodiment, the present embodiment is different from the salinity response type emulsion of the present embodiment, and the salinity response type emulsion of the present embodiment includes a heavy oil, a hydrophilic emulsifier, a hermitish. Emulsifier and liquid water; the viscosity of 1500 MPa · S thick oil at 60 ° C in the salinity response type emulsion is 28%, the mass fraction of the Tween 80 emulsifier and sodium sulfonate, respectively. It is 0.3% and 0.25%, the mass fraction of magnesium stearate nanoparticles is 0.65%, and the mass fraction of water is 70.8%; the preparation of salinity response type emulsion is the following steps:

[0044] Step 101, formulate a hydrophilic emulsifier aqueous solution, 70.8 g of water is added at room temperature to add 0.3 g of Tween 80 emulsifier and 0.25 g of petroleum sulfate, and utilize a homogenizer or emulsifier. The mixture was stirred at 2000 RPM for 15 minutes to obtain a hydrophilic emulsif...

Example Embodiment

[0057] Example 3

[0058] In this example, the present embodiment is different from the salinity response type emulsion of the present embodiment, and the salinity response type emulsion of the present embodiment comprises a heavy oil, a hydrophilic emulsifier, aphiloreon. Type emulsifier and liquid water; the viscosity of 60 ° C in the salinity response type emulsion is 26%, the mass of 26%, magneson nanoparticles and Tween 80 type emulsifiers The fraction is 0.3% and 0.3%, respectively, the mass fraction of the drum 60 emulsifier and the OP-4 emulsifier is 0.3% and 0.4%, respectively, and the mass fraction of water is 73.7%; the preparation of salinity response type emulsion liquid includes the following steps :

[0059] Step 101, formulated a hydrophilic emulsifier aqueous solution, add 73.7 g of water to the beaker at room temperature, add 0.3 g of magnesiamic nanoparticles and 0.3 g of Tween 80 emulsifier to the water to remove water, using a homogeneous machine or emulsified...

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Abstract

The invention discloses a method for temporarily plugging diversion fracturing by using a salinity response type emulsion. The method comprises the following steps of 1, preparing the salinity response type emulsion; 2, injecting the salinity response type emulsion to plug old cracks or high-permeability layers; 3, aging the salinity response type emulsion and initiating phase inversion to form plugging; and 4, injecting a fracturing fluid for the diversion fracturing to form new cracks. A salinity response type emulsion-based diverting agent has the advantages of simple preparation, high plugging performance and small formation damage, and solves the problems of low plugging strength, complex use process, difficult gel breaking or degradation, low flowback rate and large formation damage of an existing diverting agent; and the diverting agent can effectively plug the original cracks, and then the new cracks have a certain angle with respect to the original cracks are formed after the diversion fracturing, so that more oil gas seepage channels are formed, the oil drainage area is expanded, the crude oil recovery rate and economic benefits are greatly improved, and the diverting agent is convenient to popularize and use.

Description

technical field [0001] The invention belongs to the technical field of salinity-responsive emulsion used for diverting fracturing, and in particular relates to a method for temporarily plugging diverting fracturing with salinity-responsive emulsion. Background technique [0002] In recent years, with the continuous advancement of technology, my country's unconventional oil and gas exploration and development have also made important progress. Unconventional oil and gas resources are becoming the reality and replacement resources of oil and gas exploration and development. The physical properties of the reservoir are poor, and the oil and gas wells have no natural production capacity, so they must be fractured before they can be put into production. Due to the influence of in-situ stress and rock brittleness index, the fracturing fractures extend in a certain direction. After the oil and gas wells are produced for a period of time, the oil and gas reserves near the fractures f...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B43/26C09K8/504C09K8/506
CPCE21B33/13E21B43/261C09K8/5045C09K8/506C09K2208/10C09K2208/30
Inventor 周伟辛翠平李辉于强李荣西里奇·迪耶维伊·穆瓦尔迪赵迪张艳妮刘齐
Owner CHANGAN UNIV
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