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Oil and gas well cementation and completion method

A technology for cementing and completing wells and oil and gas wells, which is applied to wellbore/well components, earthwork drilling, and fluid production, etc. It can solve the problems of oil and gas layer pollution, contaminate oil layers, reduce the effect of underbalanced drilling to protect oil and gas layers, etc. The effect of mutual influence and avoiding serious pollution

Inactive Publication Date: 2009-03-18
WESTERN DRILLING KELAMAYI DRILLING TECH INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, after underbalanced drilling, if the casing cementing operation is used, the well must be killed before the cement injection, and the well killing fluid will seriously pollute the oil layer. In the middle or during the waiting solidification process, the wellbore fluid column pressure at each point of the sealing section must be greater than the formation pressure, which will also pollute the oil layer. The above situations will greatly reduce the effect of underbalanced drilling to protect the oil and gas layers, and even cause damage to the oil and gas layers. More serious pollution than conventional overbalanced drilling

Method used

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  • Oil and gas well cementation and completion method
  • Oil and gas well cementation and completion method
  • Oil and gas well cementation and completion method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The steps of embodiment one:

[0023] One is after the underbalanced drilling operation is completed, the drill string in the well is raised, and the downhole control valve (the authorized patent ZL2004200501613 declared by the Drilling Technology Research Institute of Xinjiang Petroleum Administration Bureau on April 22, 2004) or other downhole control valves or other non-pressurized valves are closed. The well tripping device, according to the measured position of the oil and gas layer and the predetermined interlayer isolation plan, configures a certain number and appropriate type of packers 1 on the completion string 2, and the packers 1 are filled with cement type packer, the length of the uppermost packer on the pipe string from the bottom end face of the completion pipe string should be less than the running depth of the downhole control valve;

[0024] The second is to run into the completion string 2, and when it reaches the top of the downhole control valve, i...

Embodiment 2

[0031] The steps of embodiment two:

[0032] as attached figure 2 As shown, the other steps are as described in Example 1, except that the setting position of the packer 1 in step 3 is the oil-gas interval 5, the length of the packer 1 exceeds the length of the oil-gas interval 5, and it is ensured that both its upper and lower ends enter into the oil-gas interval. The upper and lower non-oil and gas intervals 4 adjacent to the layer 5, and the length of the packer 1 should not exceed the length of a single casing, and the upper and lower ends should be enough for the position of the casing on and off, and the packer 1 should be cemented. The packed packer separates the oil-gas zone 5 from the non-oil-gas zone 4 .

Embodiment 3

[0033] The steps of embodiment three:

[0034] Such as image 3 As shown, other steps are as in Example 1. The packer uses cement slurry to fill the long rubber cartridge packer 3, and after the cement slurry is solidified, perforation is performed at the position of the oil and gas layer.

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Abstract

The invention relates to a well cementing and completion method for an oil-gas well used for the well-completion operation of petroleum, which comprises the following steps: after the under-balanced drilling operation is completed, a certain number of and adequate types of packers are arranged on a well-completion pipe column (2) according to the measured position of an oil-gas layer and the predetermined interlayer isolation proposal; the position of the oil-gas layer (5) is accurately clamped through an underground control valve or other no-killing trip device, and the well-completion pipe column is landed; when the well-completion pipe column is landed to the predetermined position, the packers (1) are sealed (the packers or oil-expanded packers are filled with cement slurry) or long packer rubber packers (3) are filled with the cement slurry, and interlayer isolation between the oil-gas layer (5) and a non oil-gas layer (4) can be realized under the underbalance condition; and a perforating hole of the oil-gas layer is aligned, so as to communicate a wellbore and the oil-gas layer and perform mining or implement strengthening mining measures. By adoption of the method for well cementing and completion, severe pollution of the overbalance pressure on the oil-gas layer can be avoided during the well cementing process of a lower sleeve after under-balanced drilling.

Description

technical field [0001] The invention relates to a cementing and completion method for oil and gas wells, in particular to a cementing and completion method for protecting oil and gas layers under underbalanced conditions after underbalanced drilling operations to avoid contamination of oil and gas layers. Background technique [0002] Underbalanced drilling is one of the most effective technical means to discover and protect oil and gas layers. [0003] Through the cooperation of the downhole control valve (authorized patent ZL2004200501613, etc. declared by the Drilling Technology Research Institute of Xinjiang Petroleum Administration Bureau on April 22, 2004) and conventional underbalanced drilling technology, drilling, mud logging and well logging can be performed under underbalanced conditions However, if it is necessary to isolate the well section drilled by underbalanced drilling to implement acidizing, fracturing and other enhanced recovery measures, the current meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B43/02E21B43/11E21B33/10E21B33/13
Inventor 潘仁杰许树谦陈若铭宋朝晖张兴国
Owner WESTERN DRILLING KELAMAYI DRILLING TECH INST
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