Oil well low differential pressure addition sand prevention process method

A process method and sand control technology, which can be used in earth-moving drilling, flushing wellbore, wellbore/well components, etc., and can solve the problems of small packing layer conductivity, large additional pressure difference, and incompact sand control packing.

Inactive Publication Date: 2018-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional gravel packing is not compact for sand control, the mixing of formation sand and packing sand reduces the conductivity of the packing layer, the additional pressure difference is large, and the oil well fluid volume drops rapidly after the well is opened, which restricts the economical and efficient development of unconsolidated sandstone reservoirs

Method used

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  • Oil well low differential pressure addition sand prevention process method

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Embodiment Construction

[0030] In order to make the above and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments are listed below and shown in the accompanying drawings in detail as follows.

[0031] Such as figure 1 as shown, figure 1 It is a flow chart of the low additional pressure difference sand control process for oil wells of the present invention.

[0032] Step 101. Wellbore Preparation

[0033] (1) Pull out the original well string: pull out the original well production string, salvage the original well sand control pipe, and observe the damage of the original well string and the falling objects at the bottom of the well.

[0034] (2) Sand flushing: lower the light tubing with bell mouth, sand flushing to the bottom of the artificial well, and remove residual sand in the well, with a displacement of 300L / min to 600L / min.

[0035] (3) Well opening and scraping pipe: lower the well opening gauge to the bottom of the artificial well...

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Abstract

The invention provides anoil well low differential pressure addition sand prevention process method. The method includes the following steps of step 1 preparingwellholes, lifting original well tubularcolumns, conductingexploratory sand, pigging, scraping tubes, and performingpressure tests on oil tubes and casings; step 2, pretreating stratum, after the tubular columns are put in, openingaoil tubevalve to control spray, conducting nitrogen foam flowback, conducting exploratory sand, and washing wells; step 3, performing gravel filling sand prevention construction; step 4, performing sand filter tube hanging sand prevention construction; step 5, performing anti-adsorbent agent squeezing construction. The methodcan reduce the additional resistance of a gravel filling layer and a wellhole sand blocking layer of the well near the oil reservoir oil well of water flooding, polymer flooding and the polymer flooding converting into the subsequent water flooding, and is the most effective sandprevention process for loosing extract production of the oil well in the middle and later periods of sandstone oil reservoirs.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a low additional pressure difference sand control process for oil wells. Background technique [0002] Unconsolidated sandstone reservoirs are one of the key points in the development of Shengli Oilfield. The reservoirs of this kind of reservoirs are loosely cemented and prone to sand production during the development process. Gravel packing and sand control are one of the main measures to ensure the normal development of such reservoirs. Conventional gravel packing is not compact for sand control. The mixing of formation sand and packing sand reduces the conductivity of the packing layer, and the additional pressure difference is large. After the well is opened, the oil well fluid volume drops rapidly, which restricts the economical and efficient development of unconsolidated sandstone reservoirs. For this reason, we have invented a new oil well low additional pres...

Claims

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Application Information

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IPC IPC(8): E21B43/02E21B43/08E21B43/04E21B31/00E21B37/02E21B43/00E21B21/00
CPCE21B43/02E21B21/00E21B31/00E21B37/02E21B43/00E21B43/04E21B43/086
Inventor 李常友李鹏陈刚姜静赵益忠梁伟吴琼杨军王勇马丁
Owner CHINA PETROLEUM & CHEM CORP
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