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Cement-free well cementation method for horizontal section of horizontal well

A technology for horizontal section and horizontal well, which is applied to the field of cement-free cementing in the horizontal section of horizontal wells, can solve the problems of complex cementing process and poor cementing quality, and achieve the effects of simplifying construction technology, saving completion costs and reducing pollution.

Active Publication Date: 2015-04-15
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of the prior art, to provide a cement-free completion method for the horizontal section of the horizontal well, to change the existing cement cementing technology, and to solve the problem of the complicated cementing process and poor cementing quality of the horizontal section of the horizontal well. bad question

Method used

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  • Cement-free well cementation method for horizontal section of horizontal well
  • Cement-free well cementation method for horizontal section of horizontal well
  • Cement-free well cementation method for horizontal section of horizontal well

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The completion method will be described in detail below by taking the plug-free tool (Chinese patent ZL201120157427.4) as the casing fixing tool as an example.

[0041] Form adopted figure 1 The structural form shown. Firstly, construct the structural pipe string of the well completion system with casing fixing tools in the horizontal section: from bottom to top to the wellhead, guide shoes 1-1, well flushing valves 1-2, ball seat sliding sleeves 1-3, and casing 1 are arranged sequentially. -4. Casing fixing tools 1-5 and plug-free tools. The plug-free tools mainly include salvage inner casing 1-6 and outer packer 1-7. During the running of the pipe string, the casing fixing tools 1-5 are closed, which does not affect the running of the pipe string. The constructed pipe string is lowered to the designated position of the oil and gas well for mud circulation. Expansion-sealed casing fixing device, which effectively fixes the casing and the well wall, establishes such ...

Embodiment 2

[0043] If the graded hoop is used as the top cementing tool, the steps of the well completion method are basically similar to those in Embodiment 1. The difference is that in the completion system with casing fixing tools in the constructed horizontal section, the plug-free position of the structural pipe string is replaced by a graded hoop. After the casing is lowered to the designed well depth, the pump is turned on to suppress the pressure at 5-10-12 MPa, and the pressure is stabilized for 3-5 minutes each, and the outer packer is expanded and sealed. Continue to suppress the pressure to 18MPa, and open the differential pressure grading hoop; first, the small displacement cycle of the single valve is more than one week, and after the mud circulation is normal, the large displacement cycle is normal; the cementing operation is carried out, and the cement truck is bumped (attention when the replacement is completed) Check the backflow, if there is backflow, add 2-3MPa to the ...

Embodiment 3

[0046] A self-expandable packer that can expand when encountering oil or water is used as a casing fixing tool. The packer consists of a base pipe and a rubber sleeve made of oil- or water-swellable rubber. It can be connected in series in the casing according to certain rules, and seal off the water layer and support the fixed casing after expanding downhole. It is also possible to vulcanize the rubber on the outer wall of the casing that can expand when encountering oil or water. After the rubber expands, it replaces the well cementing and is used to support and fix the casing.

[0047] The following examples for casing anchors include

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Abstract

The invention relates to a cement-free well cementation method for a horizontal section of a horizontal well. The cement-free well cementation method the step of constructing a well completion system structural pipe string of a horizontal section sleeve fixing tool; delivering the constructed pipe string to the bottom of an oil-gas well, performing mud circulation, starting the sleeve fixing tool, effectively fixing a sleeve and the well wall, and establishing internal circulation of the well; throwing balls into the well, building and testing the pressure, increasing and stabilizing the pressure until a packer inflatable channel in a non-drilling plug tool is open, and inflating and sealing the packer; increasing and stabilizing the pressure until the packer inflatable channel is closed; increasing the pressure until a cement injection channel is opened; delivering a well cementation rubber plug to a close seat of the non-drilling plug tool, and closing the cement injection channel; and salvaging the inner cylinder of the non-drilling plug tool, matching accessories and the well cementation rubber plug to complete the whole construction process. By using the method, the construction process can be simplified, the working cycle can be shortened, and the well completion cost is reduced.

Description

technical field [0001] The invention relates to a cement-free cementing method for a horizontal section of a horizontal well in the technical field of oil and gas well completion methods. Background technique [0002] The use of cement cementing in the horizontal section of a horizontal well is a well completion method commonly used in well completion at home and abroad. Horizontal wells are widely used in the exploration and development of major oil fields. Due to the inherent characteristics of horizontal wells, the cementing of horizontal wells is relatively different from that of vertical wells due to the influence of factors such as high casing friction, large cement slurry water loss, casings not centered in high-inclination sections and horizontal sections, and the presence of cuttings beds. The specific cementing success rate is low and the cost is high, the long horizontal section cementing operation is difficult, and the cementing quality is poor. The current rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 彭志刚张磊许婵婵徐鑫李国锋董恩博邹晓敏赵勇马明新
Owner CHINA PETROCHEMICAL CORP
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