High-erosion-resistance screen pipe outer protective cover and method for reducing erosion damage risk of screen pipe

An outer protective cover, high anti-scour technology, used in earth-moving drilling, production fluids, wellbore/well components, etc., can solve the problem of difficult to locate the high-risk position of screen erosion damage, and enhance the screen of the whole well section. In order to improve the anti-erosion ability of the screen pipe, reduce the risk of erosion damage and enhance the anti-erosion ability

Pending Publication Date: 2021-12-24
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is this local high-speed inflow that causes serious erosion damage to the screen
The problems existing in the sand control completion of existing oil and gas well screens are: there is currently a lack of identification methods for high-speed inflow areas, and it is difficult to locate the high-risk locations of screen erosion damage. Well design lacks purpose
Generally enhance the anti-erosion performance of the screen in the whole well section, which will greatly increase the cost and poor economy

Method used

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  • High-erosion-resistance screen pipe outer protective cover and method for reducing erosion damage risk of screen pipe
  • High-erosion-resistance screen pipe outer protective cover and method for reducing erosion damage risk of screen pipe
  • High-erosion-resistance screen pipe outer protective cover and method for reducing erosion damage risk of screen pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Such as figure 1 , figure 2 As shown, a high erosion-resistant screen outer protective cover, the outer protective cover includes an inner layer matrix 1 and an outer layer matrix 3 arranged together from the inside to the outside, and the inner layer matrix 1 and the outer layer matrix 3 are Both are provided with horizontally arranged arc-shaped punching slots, the arc-shaped punching slots 2 on the inner substrate and the arc-shaped punching slots 4 on the outer layer substrate are interlaced, and the arc directions of the arc-shaped punching slots are opposite.

[0081] The thickness of the inner substrate 1 is 0.4-0.6mm, the length of the arc-shaped punching seam is 50-10mm, the punching distance is 20-30mm, and the arc angle is controlled at 150-170°. The thickness of the outer substrate 3 is 0.5-0.8mm, the length of the arc-shaped punching seam is 50-10mm, the punching distance is 30-40mm, and the arc angle is controlled at 150-170°. The diameter of the inner...

Embodiment 2

[0084] A screen with high erosion resistance, the screen includes from the inside to the outside in sequence: a base pipe, the base pipe is provided with diversion holes communicating with the inside of the base pipe; an inner layer filter is sleeved on the outside of the base pipe; The outer layer filter set on the outside of the base pipe; the pre-fill layer between the inner layer filter screen and the outer layer filter screen; the outer protective cover of embodiment 1, the outer protective cover is set on the outer side of the outer layer filter screen, and the end fixed on the base tube.

Embodiment 3

[0086] The sand control completion method for reducing the risk of erosion damage by using the high erosion resistance screen of embodiment 2 includes:

[0087] S1: provide a high erosion resistance screen;

[0088] S2: Based on the heterogeneity of the inflow and sand production profiles displayed by porosity and rock density, identify the high-speed inflow and sand production positions and area lengths during the production process, and determine the high-speed inflow positions and areas in the production interval of oil and gas wells as a follow-up improvement Anti-erosion ability of the screen, and the target position to reduce the risk of erosion damage to the bottom hole screen;

[0089] The identification method of the high-speed inflow position and the area length of the oil and gas well production section is as follows:

[0090] Step 1: Obtain the porosity and rock density of the production section of the target well;

[0091] Step 2: Calculate the pseudo-inflow ind...

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Abstract

The invention relates to a high-erosion-resistance screen pipe outer protective cover and a method for reducing the erosion damage risk of a screen pipe. The outer protective cover comprises an inner layer base body and an outer layer base body, wherein the inner layer base body and the outer layer base body are both provided with arc-shaped punching seams which are transversely arranged, and the arc-shaped punching seams are staggered, the arc directions are opposite. The method for reducing the erosion damage risk of the screen pipe comprises the steps that S1, the high-erosion-resistance screen pipe is provided, the side face inclined high-speed inflow erosion protection function is enhanced, and the flowing resistance of fluid passing through the outer protection cover is reduced; S2, a method for identifying the high-speed inflow position and area of the oil and gas well production interval can identify the area and length with high erosion risk in the production process; and S3, a sand control well completion design method for reducing the erosion damage risk of the screen pipe is adopted. According to the high-erosion-resistance screen pipe outer protective cover and the method, the anti-erosion capacity of the screen pipe in a high-erosion-risk area in the whole well section is improved, the erosion damage risk of the screen pipe at the bottom of the well is reduced, meanwhile, the use amount of the screen pipe of the high-erosion-resistance outer protective cover is reduced, and the sand control well completion cost is saved.

Description

technical field [0001] The invention relates to an outer protective cover of a high erosion-resistant screen pipe and a method for reducing the risk of erosion damage of the screen pipe, belonging to the field of screen pipe sand control completion design in the oil and gas development and exploitation industry. Background technique [0002] Among the conventional oil and natural gas reservoirs in my country and the world, more than 70% are weakly cemented unconsolidated sandstone oil and gas reservoirs, and sand production is serious during the mining process. The so-called sand production refers to the phenomenon that formation sand grains are produced to the wellbore or the ground along with the formation fluid during the exploitation of oil and natural gas unconsolidated sandstone reservoirs and natural gas hydrate reservoirs. Sand control is currently the main way to solve the sand production problem, and mechanical screen sand control is one of the main sand control co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/08
CPCE21B43/08E21B43/086
Inventor 董长银王力智周博宋洋李怀文皇凡生邵力飞王超孙涛刘伟
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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