Well-cementing and self-healing cement slurry for oil-gas field

A self-healing technology for oil and gas fields, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reduced seepage and anti-seepage performance, inability to function, interlayer fluid crossing, etc., and achieve settlement stability Good, adjustable thickening time, and improved mechanical properties

Active Publication Date: 2013-12-18
古莱特科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These externally induced cement sheath damages often result in the formation of micro-annulus that are so small that it is nearly impossible to pinpoint their exact location, let alone repair them
But even the smallest micro-annulus is enough to become a channel for fluid flow. Under high-energy concentrating flow and strong impact, it will cause the cement sheath to break and form micro-cracks.
All of these may lead to interlayer fluid interflow in the subsequent production process, resulting in greatly reduced seepage reduction and anti-seepage performance
Although cementing experts can use various techniques to enhance the resistance of the cement matrix to various stresses, these techniques will not be effective once the cement sheath is damaged
The existing cement slurry system can not solve the problem of self-healing of micro-cracks well

Method used

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  • Well-cementing and self-healing cement slurry for oil-gas field
  • Well-cementing and self-healing cement slurry for oil-gas field
  • Well-cementing and self-healing cement slurry for oil-gas field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of self-healing cement slurry for cementing in oil and gas fields, its raw material composition and quality are respectively:

[0032] The quality of grade G oil well cement is 800g; acrylamide-acrylamide-2-methylpropanesulfonate sodium copolymer 16g; oil content is 10% natural oil latex 80g; OP-40 stabilizer 2g; lignin sulfonate 8g; tributyl phosphate defoamer 4g; citric acid 0.24g; water 282g.

[0033] The weighing amount of slurry mixing water is the total water amount calculated according to the water-cement ratio, and then subtract the water content in each additive.

[0034] The preparation method of the present invention is as follows: uniformly mix each additive component at a low shear rate, then weigh a certain amount of cement and add it to the slurry mixing liquid, and mix the slurry according to the API standard to obtain the present invention.

Embodiment 2

[0036] A kind of self-healing cement slurry for cementing in oil and gas fields, its raw material composition and quality are respectively:

[0037] The quality of grade G oil well cement is 800g, 16g of acrylamide-acrylamide-2-sodium methylpropane sulfonate copolymer; 2g of OP-40 stabilizer; 80g of styrene-butadiene oil-containing latex with an oil content of 10%; lignosulfonic acid Salt 8g; tributyl phosphate defoamer 4g; citric acid 0.24g; water 282g.

Embodiment 3

[0039] A kind of self-healing cement slurry for cementing in oil and gas fields, its raw material composition and quality are respectively:

[0040] The quality of grade G oil well cement is 800g, 24g of acrylamide-acrylamide-2-methylpropanesulfonate sodium copolymer; 2g of OP-40 stabilizer; 80g of natural oil latex with an oil content of 10%; lignosulfonate 8g; silicone defoamer 4g; citric acid 2.4g; water 271.5g.

[0041] Verify the use effect of the present invention by comparative example below:

[0042] Grade G oil well cement 800g, acrylamide-acrylamide-2-methylpropanesulfonate sodium copolymer 16g; lignin sulfonate 8g; tributyl phosphate 4g; citric acid 0.24g; tap water 324g.

[0043] Table 1 Basic properties of cement slurry

[0044]

[0045]

[0046] Table 2 Self-healing performance of cement slurry

[0047]

[0048] Note: "—" in Table 2 indicates that self-healing cannot be achieved.

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Abstract

The invention relates to well-cementing and self-healing cement slurry for an oil-gas field, which is suitable for the field of oil well cementation. The well-cementing and self-healing cement slurry comprises the following additives percentage by weight: 2-4% of fluid loss agent, 5-40% of self-healing component, 0.2-1.0% of stabilizing agent, 0.5-2.0% of dispersing agent, 0.3-1.0% of de-foaming agent, and 0.03-0.5% of retarding agent by taking the weight of cement as benchmark. A preparation method of the well-cementing and self-healing cement slurry is as follows: controlling the water cement ratio to be 0.44, uniformly mixing the additives at a low shearing speed, weighing a certain amount of cement, adding into slurry preparation liquid, and mixing with API (American petroleum institute) standards to obtain the well-cementing and self-healing cement slurry. The well-cementing and self-healing cement slurry has the characteristics of low water loss, adjustable thickening time, gas channeling prevention and excellent impervious performance and the like, has the functions of crack prevention and self healing, and remarkably improves the mechanical property of the cement.

Description

technical field [0001] The invention belongs to the field of well cementing and cementing in oil fields, and relates to well cementing cement slurry, in particular to a self-healing cement slurry for oil and gas field well cementing. Background technique [0002] In oil and gas well operations, the main purpose of cement slurry is to fill the annular space between the casing and the well wall interface. Its functions are 1. to support and protect the casing, and 2. to separate layers. It will form impermeable cement stone, which can prevent fluids from different layers from crossing each other. [0003] Various operations place certain stresses on the cement over time, and any one of these conditions can also cause damage to the cement sheath. These externally induced cement sheath damages often result in the formation of microannulus that are so small that it is almost impossible to pinpoint their exact location, let alone repair it. But even the smallest micro-annulus is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C09K8/487
Inventor 郭丽梅王威耿国伟
Owner 古莱特科技股份有限公司
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