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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 diverting agent that can be applied under high-temperature and high-salt conditions. The diverting agent is also a water-in-oil emulsion prepared from diesel oil, emulsifier and water. Temporary plugging acidification diverting agent, although it has the advantages of temperature resistance and salt resistance, but the embodiment of the invention patent shows that the viscosity of the diverting agent is still as high as 302.7mPa.s under the preferred oil-water ratio of 3:7, so the diverting agent is also In the actual injection process on site, due to the high viscosity, it is difficult to inject, and it can only be injected into the fracture or high permeability layer near the wellbore, forming a plug near the wellbore, which cannot be migrated to the deep formation, and the plugging strength is weak

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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Effect test

Embodiment 1

[0027] Such as figure 1A salinity-responsive emulsion is shown as a method for temporarily plugging and diverting fracturing, including the following steps:

[0028] Step 1. Prepare a salinity-responsive emulsion, which is characterized in that it includes a thick oil, a hydrophilic emulsifier, an lipophilic emulsifier, and dosing water; the salinity-responsive emulsion The viscosity at 60°C in the liquid is 2800mPa·s The mass fraction of heavy oil is 24%, the mass fractions of magnesium lithium silicate nanoparticles and sodium petroleum sulfonate are 0.4% and 0.4% respectively, magnesium stearate nanoparticles and The mass fraction of the disc 60 type emulsifier is 0.5% and 0.3% respectively, and the mass fraction of clear water is 74.4%; the preparation of salinity-responsive emulsion comprises the following steps:

[0029] Step 101, prepare a hydrophilic emulsifier aqueous solution, take 74.4g of clear water and add it to a beaker at room temperature, add 0.4g of magnesiu...

Embodiment 2

[0043] The difference between this example and Example 1 is that the salinity-responsive emulsion prepared in step 1 in this example is different. The salinity-responsive emulsion in this example includes heavy oil, hydrophilic emulsifier, lipophilic type emulsifier and dosing water; the viscosity at 60°C in the salinity-responsive emulsion is that the mass fraction of 1500mPa·s heavy oil is 28%, and the mass fractions of Tween 80 emulsifier and sodium petroleum sulfonate are respectively 0.3% and 0.25%, the massfraction of magnesium stearate nanoparticles is 0.65%, and the massfraction of clear water is 70.8%; the preparation of salinity-responsive emulsion comprises the following steps:

[0044] Step 101, prepare a hydrophilic emulsifier aqueous solution, take 70.8g of clear water and add it to a beaker at room temperature, add 0.3g of Tween 80 type emulsifier and 0.25g of petroleum sodium sulfonate to the clear water, and use a homogenizer or an emulsifier in the Stir for 1...

Embodiment 3

[0058] The difference between this example and Example 2 is that the salinity-responsive emulsion prepared in step 1 in this example is different. The salinity-responsive emulsion in this example includes heavy oil, hydrophilic emulsifier, lipophilic type emulsifier and dosing water; the viscosity at 60°C in the salinity-responsive emulsion is that the mass fraction of 3500mPa·s heavy oil is 26%, and the mass fraction of lithium magnesium silicate nanoparticles and Tween 80 type emulsifier The fractions are 0.3% and 0.3% respectively, the mass fractions of Span 60 emulsifier and OP-4 emulsifier are respectively 0.3% and 0.4%, and the mass fraction of clear water is 73.7%; the preparation of salinity-responsive emulsion comprises the following steps :

[0059] Step 101, prepare a hydrophilic emulsifier aqueous solution, take 73.7g of clear water and add it to a beaker at room temperature, add 0.3g of lithium magnesium silicate nanoparticles and 0.3g of Tween 80 emulsifier to th...

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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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