A sand control method for fine silt sand reservoir filling

A technology for fine silt sand and sand control, which is applied in earthwork drilling, wellbore/well components, instruments, etc. It can solve problems such as easy to break water layers and short sand control period, so as to ensure effectiveness, meet sand control requirements and reduce costs Effect

Active Publication Date: 2019-08-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a fine silt sand oil layer filling sand control method, so as to solve the problems that the existing fine silt sand oil layer sand control method is easy to crush the water layer and the sand control period is short

Method used

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  • A sand control method for fine silt sand reservoir filling
  • A sand control method for fine silt sand reservoir filling
  • A sand control method for fine silt sand reservoir filling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The fine silt sand oil layer filling sand control method of the present embodiment, for Pai 206-25 well, comprises the following steps:

[0054] 1) According to image 3 , Figure 4 The well logging interpretation result map shows that the oil layer thickness H is 3m, and the rock porosity 10%, oil saturation S is 10%, rock permeability K is 1μm 2 , calculated to get Productivity coefficient = H × K = 3m·μm 2 ; Take the oil layer as the sand control layer;

[0055] Through the analysis of rock thin section test, it can be concluded that the sample of fine silt sandstone is gray-green, and the cementation type is basal cementation; Quality rock 10%, mudstone content 25%, mica 10%;

[0056] Fill the rock debris sample of the fine silt sand oil layer into the sand filling pipe, and measure the permeability of the sand control fluid to the rock debris in the sand filling pipe; the mass percentage composition of the sand control fluid used is: polymer thickener 0.5%,...

Embodiment 2

[0087] The fine silt sand reservoir filling sand control method of the present embodiment, for Chun 90 well, comprises the following steps:

[0088] 1) According to the result map of well logging interpretation, the oil layer thickness H is 8m, and the rock porosity 25%, oil saturation S is 25%, rock permeability K is 1μm 2 , calculated to get Productivity coefficient = H×K=8m·μm2; take this oil layer as sand control layer;

[0089] Fill the rock debris sample of the fine silt sand oil layer into the sand filling tube, and measure the permeability of the sand control fluid to the rock debris in the sand filling tube; the mass percentage composition of the sand control fluid used is: 0.5% guar gum, 3% KCl, NH 4 Cl 2%, the balance is water, and its permeability reduction value is 10%, which meets the requirements;

[0090] The D50 particle size of the formation rock in this well is 0.04mm;

[0091] 2) The interlayer rock core 3.5m below the water intake layer and with a natu...

Embodiment 3

[0116] The fine silt sand oil layer filling sand control method of the present embodiment, for Chun 110E well, comprises the following steps:

[0117] 1) According to the result map of well logging interpretation, the oil layer thickness H is 3.5m, and the rock porosity 15%, oil saturation S is 15%, rock permeability K is 1μm 2 , calculated to get Productivity coefficient = H × K = 3.5m·μm 2 ; Take the oil layer as the sand control layer;

[0118] Fill the rock debris sample of the fine silt sand oil layer into the sand filling tube, and measure the permeability of the sand control fluid to the rock debris in the sand filling tube; the mass percentage composition of the sand control fluid used is: 0.5% guar gum, 3% KCl, NH 4 Cl 2%, the balance is water, and its permeability reduction value is 10%, which meets the requirements;

[0119] The D50 particle size of the formation rock in this well is 0.06mm;

[0120] 2) The interlayer rock core 5m below the water intake layer...

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Abstract

The invention relates to a packing and sand control method for a fine silt oil reservoir. The method comprises the steps that 1, a sand control measure layer is determined according to a well log graph; 2, according to the young modulus and poisson ratio when an interlayer rock core is translated from an elastic stage into a plastic stage, the construction limited pressure in the elastic deformation of the interlayer rock is calculated; 3, squeeze packing construction is simulated, and whether the cracks produced when the elastic deformation of the interlayer occurs in the squeeze packing process extend to a water layer or not is determined; 4, packing and sand control construction are performed on a sand control measure layer using target sand control fluid and the construction limited pressure. The packing and sand control method sets scientifically the sand control measure layer and the construction limited pressure according to own characteristics of the fine silt oil reservoir, and by using the property that the elastic deformation of the interlayer rock can be recoverable, the degree that the cracks after the squeeze packing extend to the water layer is reduced, thus the sand control effectiveness is ensured, and the sand control period is prolonged.

Description

technical field [0001] The invention belongs to the technical field of oil and gas well sand control, and in particular relates to a fine silt sand oil layer filling sand control method. Background technique [0002] During the production of fine silt reservoirs, fine silt and argillaceous rock will enter the wellbore or be carried to the surface with oil and water, and will be eroded, worn, blocked deep well pumps and pipelines and ground equipment, or deposited at the bottom of the well. Blocking the oil layer means that the production of the oil well is reduced or stopped; even the oil layer collapses and the casing is collapsed, resulting in the overhaul or scrapping of the oil well. Taking Chunguang Oilfield as an example, its reservoirs are mainly siltstone and argillaceous rock, the rock grain size ranges from silt to fine sand, with an average particle size of 0.1-0.12 mm, the reservoir is undercompacted, poor in diagenesis, loose in cementation, and Severe sand; du...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50E21B43/02
CPCE21B43/02G06F30/13
Inventor 李梦楠冯兴武邢德钢刘洪涛蒋尔梁刘约安李峰肖诚诚
Owner CHINA PETROLEUM & CHEM CORP
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