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Sand removal technology for oilfield fracturing flowback fluid

A technology for oil field fracturing and flowback fluid, which is applied in the direction of filtration and separation, separation methods, chemical instruments and methods, etc., and can solve the problem of poor anti-wellhead flowback pressure and impact resistance, equipment that cannot be directly connected to oil well flowback ports, and on-site To solve problems such as large application limitations, achieve the effects of strong impact resistance, remarkable continuous sand removal performance, and reliable design

Active Publication Date: 2015-12-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the desanding processes used in oil fields are roughly divided into two categories. One is simple desanding through natural sedimentation and brief filtration. Combined sand removal based on "swirl flow sand removal + inclined plate inclined tube sedimentation + orifice plate seepage + static sedimentation" has complex process, low processing capacity, poor anti-wellhead flowback pressure and impact resistance. During the sand removal process , each component requires a certain flow time, and the equipment cannot be directly connected to the flowback port of the oil well, and the sand removal effect must be achieved by controlling the flow rate at the equipment inlet, which has great limitations in field application

Method used

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  • Sand removal technology for oilfield fracturing flowback fluid
  • Sand removal technology for oilfield fracturing flowback fluid
  • Sand removal technology for oilfield fracturing flowback fluid

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Experimental program
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Embodiment

[0012] refer to Figures 1 to 3 Embodiments of the present invention are further described:

[0013] The specific implementation steps of this desanding process are as follows:

[0014] 1) Connect the cyclone desanding device 1 to the wellhead, so that the cyclone desandering device 1 operates with the pressure of the fracturing flowback fluid in the wellbore of the oil well;

[0015] 2) Connect the outlet water from the cyclone sand removal device 1 to the pressure relief and degassing device 2 for gas-liquid separation and filtration and sedimentation; then, the primary water transfer pump 3 is directly pressed into the primary filter device 4 and the sewage tank 5, and left to stand Precipitate for 30-40min;

[0016] 3) After precipitation, the water is directly pressed into the secondary filter device 7 by the secondary transfer pump 6, and the content of sand particles and mechanical impurities in the treated water is below 0.2%;

[0017] 4) Import the treated water in...

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Abstract

The invention discloses a desanding technology of an oilfield flown back fracturing fluid. The technology is designed to realize the closed continuous desanding, multilevel control and non-grounding desanding of the flown back fracturing fluid. A waste liquid is processed by a cyclone desanding device, the processed waste liquid enters a pressure relief degassing device for gas-liquid separation and filtering sedimentation, the obtained waste liquid is directly pumped into a filter-order filtering device through a first-order water pump, the filtered waste liquid is settled in a sewage pot, the settled filter waste is directly pumped into a second-order filtering device through a second-order water pump and is processed, and the finally obtained product is introduced into a purified water tank. The desanding technology has the advantages of reliable design, simple operation, no need of over-current, and substantial continuous desanding performance, and an apparatus for realizing the technology has the advantages of strong impact resistance, closed processing process, large processing capacity, and high desanding efficiency.

Description

technical field [0001] The invention relates to a sand removal process for oilfield fracturing flowback fluid, and belongs to the technical field of low-permeability oilfield development. Background technique [0002] Since the Changqing Oilfield has always been in a state of low pressure, low abundance and low permeability, it relies on artificial diversion fractures produced by fracturing the formation for production. After the fractured oil well formation is pressure-suppressed, the residual waste liquid in the fracture and oil casing must be flowed back to the ground by the formation pressure. Since the flowback waste fluid is mixed with a large amount of residual fracturing sand and fine gravel after abrasion, sand removal is the primary condition for the repeated reuse of fracturing flowback fluid. [0003] The flowback pressure of on-site fracturing in the oil field can reach 10-20Mpa, and the viscosity of the flowback fluid is all below 10mPa·s. The fracturing grave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D36/04
Inventor 任小荣李宪文周立辉任建科冀忠伦蒋继辉张海玲李岩
Owner PETROCHINA CO LTD
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