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Method for treating natural gas well suite gas channeling

A technology of natural gas and suites, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc. It can solve problems such as gas well safety and environmental hazards, wellhead pressure rise, and inability to perform effective repairs, etc., to avoid The effect of major workover operations

Inactive Publication Date: 2013-11-06
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Gas retention at the wellhead of natural gas wells and sustained annular pressure (sustained annular pressure) caused by gas channeling have always been serious problems faced by many oil and gas fields in the world, causing many gas wells to pose safety and environmental hazards
Most oil and gas wells with pressure in the annular space cannot be effectively repaired due to the limitations of the wellbore structure and engineering conditions

Method used

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  • Method for treating natural gas well suite gas channeling
  • Method for treating natural gas well suite gas channeling
  • Method for treating natural gas well suite gas channeling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for controlling gas channeling between natural gas well casings, comprising the following steps:

[0029] In the first step, the cementing cement sheath self-repairing agent and water are formulated into a self-repairing fluid according to a weight ratio of 20:100, and the cementing cement sheath self-repairing agent is sodium silicate;

[0030] In the second step, for the natural gas well with wellhead gas blow-by, the wellhead pressure of the natural gas well is released, and then the self-repairing fluid is squeezed into the gas blow-by annulus of the casing of the natural gas well. Among them, for the natural gas well whose cement slurry has not returned to the ground, the wellhead pressure of the natural gas well is relieved, and then the self-repairing fluid is squeezed into the gas well annulus of the natural gas well to replace or replace the fluid in the annulus of the original mantle, and the construction Keep the squeeze-in pressure 3-5MPa higher tha...

Embodiment 2

[0033] The difference from Embodiment 1 is that the self-healing solution is a solution prepared by sodium silicate and water in a weight ratio of 10:110.

Embodiment 3

[0035] The difference from Embodiment 1 is that the self-healing solution is a solution prepared by potassium silicate and water in a weight ratio of 20:100.

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Abstract

The invention discloses a method for treating natural gas well suite gas channeling. The method comprises the following steps: preparing a well cementing sheath self-repairing agent and water into a self-repairing solution in proportion, firstly removing the well head pressure, then extruding the self-repairing solution into a suite gas channeling annulus, retaining the extruding pressure when constructing and maintaining so that the extruding pressure is 3-5 MPa more than the current well head pressure value, maintaining by holding pressure for more than one month so as to self-repair the gas channeling passage; for a newly completed natural gas well, preparing the self-repairing solution by using an oil well cement retarder, the well cementing sheath self-repairing agent and the water in proportion before the well cementation, substituting a well cementation prepad solution by the self-repairing solution; and firstly pumping the self-repairing solution before well cementation, then pumping the well cementing paste. The method provided by the invention can realize the self-repairing of the well cementing sheath suite gas channeling of the natural gas well, can improve the durability and reliability of the well cementing sheath, and guarantee the safety and economic benefit of the gas field development.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas development, in particular to a method for controlling gas channeling between casings of natural gas wells. Background technique [0002] Gas retention at the wellhead of natural gas wells and sustained annular pressure (sustained annular pressure) caused by gas channeling have always been serious problems faced by many oil and gas fields in the world, causing many gas wells to have hidden dangers to safety and the environment. Many gas fields in my country, such as Sichuan and Karamay, are troubled by gas blowing at wellheads to varying degrees, resulting in greater safety and environmental pressure. [0003] The basic method to solve the problem of pressure in the annulus of gas wells is to use the repair method of cement extrusion and chemical plugging and repair. However, due to the small size of the blow-by gas channel, it is difficult to squeeze in, and the success rate is low. Many ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B33/13C09K8/42
Inventor 杨振杰朱海涛王玎王嘉淮罗天雨王容军
Owner XI'AN PETROLEUM UNIVERSITY