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Pre-filling sand prevention method of highly-deviated well casing pipe and dedicated sand-filter pipe thereof

A technology of highly deviated wells and sand filter pipes, which is applied in earthwork drilling, wellbore flushing, wellbore/well components, etc. It can solve the problems of short sand control period of wells and easy damage of steam injection, so as to improve safety and The effect on success rate

Inactive Publication Date: 2013-04-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Recently, with the continuous popularization and application of screen-type sand filter pipes, the sand control technology has reached a new level, but there are still problems such as easy damage by steam injection and short sand control period in some wells

Method used

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  • Pre-filling sand prevention method of highly-deviated well casing pipe and dedicated sand-filter pipe thereof
  • Pre-filling sand prevention method of highly-deviated well casing pipe and dedicated sand-filter pipe thereof
  • Pre-filling sand prevention method of highly-deviated well casing pipe and dedicated sand-filter pipe thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A casing pre-packing sand control method for highly deviated wells, the steps of which are:

[0029] a. Obtain the physical parameters of the oil layer in the production layer, mainly including the median particle size, shale content, and sorting coefficient; for example, if Well GDN8X209 is selected, the formation cement is mainly shale, and the shale content is 11.3%; the median particle size is 0.11mm; The selection factor is 1.7, the sorting is medium, the porosity is 34.2%, and the average air permeability is 1502×10 -3 um 2 , the cementation type is pore contact type; the wettability of the oil layer is strongly hydrophilic.

[0030] b. According to the principle of moderate sand control, determine the sand-retaining accuracy of the sand filter pipe, and then determine the parameters of the pre-filled ceramsite and the parameters of the inner and outer wire-wound screen pipes; 0.4mm. The outer diameter after processing is 146mm.

[0031] c. Treat the wellbore,...

Embodiment 2

[0043] A casing pre-packing sand control method for highly deviated wells, the steps of which are:

[0044] a. Obtain the physical parameters of the oil layer in the production layer, mainly including the median particle size, shale content, and sorting coefficient; for example, if Well GDN8X209 is selected, the formation cement is mainly shale, and the shale content is 11.3%; the median particle size is 0.14mm; The selection factor is 1.7, the sorting is medium, the porosity is 34.2%, and the average air permeability is 1502×10 -3 um 2 , the cementation type is pore contact type; the wettability of the oil layer is strongly hydrophilic.

[0045] b. According to the principle of moderate sand control, determine the sand-retaining accuracy of the sand filter pipe, and then determine the parameters of the pre-filled ceramsite and the parameters of the inner and outer wire-wound screen pipes; 0.8mm. The outer diameter after processing is 142mm.

[0046] c. Treat the wellbore,...

Embodiment 3

[0058] A casing pre-packing sand control method for highly deviated wells, the steps of which are:

[0059] a. Obtain the physical parameters of the oil layer in the production layer, mainly including the median particle size, shale content, and sorting coefficient; for example, if Well GDN8X209 is selected, the formation cement is mainly shale, and the shale content is 11.3%; the median particle size is 0.12mm; The selection factor is 1.7, the sorting is medium, the porosity is 34.2%, and the average air permeability is 1502×10 -3 um 2 , the cementation type is pore contact type; the wettability of the oil layer is strongly hydrophilic.

[0060] b. According to the principle of moderate sand control, determine the sand-retaining accuracy of the sand filter pipe, and then determine the parameters of the pre-filled ceramsite and the parameters of the inner and outer wire-wound screen pipes; 0.6mm. The outer diameter after processing is 144mm.

[0061] c. Treat the wellbore,...

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Abstract

The invention discloses a pre-filling sand prevention method of a highly-deviated well casing pipe and a dedicated sand-filter pipe of the method. The pre-filling sand prevention method of the highly-deviated well casing pipe comprises the following steps: acquiring the petrophysical property parameters of production; confirming the sand-blocking precision of a sand-filter pipe, and further confirming the parameters of pre-filling ceramsite and the parameters of an inner wire-wrapped screen and an outer wire-wrapped screen; processing a mineshaft; laying the sand-filter pipe, laying the sand-filter pipe to a necessary position of a highly-deviated well according to the operating instruction of laying the sand-filter pipe, hanging a packer on the sand-filter pipe, and connecting an oil pipe below the packer, and the packer adopts a high temperature resistance type; injecting steam, and laying a pump after injecting the steam; and peripheral turning is carried out to the sand-filter pipe directly after the sand-filter pipe is flushed, and is replaced after injecting the steam for three times. The sand-filter pipe comprises a base pipe in the center and an inner wire winding layer sleeved outside the base pipe, an outer wire winding layer is sleeved outside the inner wire winding layer, and a ceramsite layer is pre-filled between the inner wire winding layer and the outer wire winding layer. The pre-filling sand prevention method of the highly-deviated well casing pipe and the dedicated sand-filter pipe of the method can achieve the integration of the steam injecting and production, simplifies the construction procedure of a periphery turning well, reduces operation cost, and improves the success rate of sand prevention.

Description

technical field [0001] The present invention relates to the sand control construction of high-inclination well casing, in particular to a high-inclination well casing pre-filling sand control method and a special sand filter pipe. Background technique [0002] Gudao Oilfield has entered the later stage of development. In order to effectively exploit the remaining underground oil, the number of inclined wells has been increasing. At present, there are 556 deviated wells in Gudao Oilfield, accounting for 28.9% of the total number of wells opened, and the trend is still increasing. The special wellbore structure of the inclined well makes it different from the vertical well in terms of production conditions and technology adoption. The increasing number of deviated wells makes the production status more and more worthy of attention. Recently, with the continuous popularization and application of screen-type sand filter pipes, the sand control technology has reached a new leve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B21/00E21B43/02E21B43/10E21B43/08
Inventor 陈辉郝金克张德杰高成元姚连勇于艳
Owner CHINA PETROLEUM & CHEM CORP
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