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Strong bunching inhibition environment-friendly drilling completion fluid

A technology of strong inhibition, drilling and completion, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of easy plugging of the throat, damage to downhole equipment, affecting the oil production rate in the oil production process, etc., and achieves strong degradability. performance, rapid flowback, and improved near-well permeability

Inactive Publication Date: 2020-02-11
新疆大德广源石油技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Conventional drilling and completion fluids are prepared with various raw materials and chemical additives, which contain non-degradable solids or highly corrosive chemical substances. Non-degradable solids are easy to block the throat, thereby affecting the oil production process. rate; chemical substances are highly corrosive, causing great damage to downhole equipment, pipelines, pump trucks, reservoirs, etc. The effect is poor, and the effective cleaning of drilling cuttings and suspended solids under the well cannot be guaranteed

Method used

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  • Strong bunching inhibition environment-friendly drilling completion fluid

Examples

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Effect test

Embodiment 1

[0027] The invention provides a kind of strongly inhibited bunching environment-friendly drilling and completion fluid, which comprises 80 parts by weight of base fluid, 10 parts by weight of microemulsion nano-preparation, 1 part by weight of plugging and anti-slumping agent, and 1 part by weight of oil-soluble temporary plugging agent and 0.8 parts by weight of corrosion inhibitor; the microemulsion nano-preparation is sequentially oxidized gel breaker, biological enzyme gel breaker, acid gel breaker and capsule shell from inside to outside; oxidized gel breaker, Biological enzyme gel breaker and acid gel breaker are separated from each other by coating film;

[0028] The oxidative breaker comprises 3 parts by weight of potassium permanganate solution, 0.5 parts by weight of magnesium peroxide, 0.1 parts by weight of vegetable oil and 0.03 parts by weight of xanthan gum;

[0029] The biological enzyme gel breaker includes 3 parts by weight of 1,4-β-D-mannanase solution, 0.3 ...

Embodiment 2

[0039] The invention provides a kind of strongly inhibited bunching environment-friendly drilling and completion fluid, which comprises 90 parts by weight of base fluid, 20 parts by weight of microemulsion nano-preparation, 3 parts by weight of plugging and anti-slumping agent, and 3 parts by weight of oil-soluble temporary plugging agent and 1.2 parts by weight of corrosion inhibitor; the microemulsion nano-preparation is sequentially oxidized gel breaker, biological enzyme gel breaker, acid gel breaker and capsule shell from inside to outside; oxidized gel breaker, Biological enzyme gel breaker and acid gel breaker are separated from each other by coating film;

[0040] The oxidative breaker comprises 7 parts by weight of potassium permanganate solution, 2 parts by weight of magnesium peroxide, 0.3 parts by weight of vegetable oil and 0.08 parts by weight of xanthan gum;

[0041] The biological enzyme gel breaker includes 8 parts by weight of 1,4-β-D-mannanase solution, 0.6 ...

Embodiment 3

[0051] The invention provides a kind of strongly inhibited bunching environmental protection drilling and completion fluid, which comprises 85 parts by weight of base fluid, 15 parts by weight of microemulsion nano-preparation, 2 parts of plugging and anti-slumping agent, and 2 parts of oil-soluble temporary plugging agent and 1.0 parts of corrosion inhibitor; the microemulsion nano-preparation is sequentially oxidized gel breaker, biological enzyme gel breaker, acid gel breaker and capsule shell from inside to outside; oxidized gel breaker, biological enzyme breaker The glue and the acid breaker are separated from each other by the coating film;

[0052] The oxidative gel breaker comprises 5 parts by weight of potassium permanganate solution, 1.3 parts by weight of magnesium peroxide, 0.2 parts by weight of vegetable oil and 0.06 parts by weight of xanthan gum;

[0053] The biological enzyme gel breaker includes 6 parts by weight of 1,4-β-D-mannanase solution, 0.5 parts by we...

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Abstract

The invention discloses a strong bunching inhibition environment-friendly drilling completion fluid which comprises 80-90 parts of a base liquid and 10-20 parts of a micro emulsion nano preparation, wherein the micro emulsion nano preparation consists of an oxidation gel breaker, a bio-enzyme gel breaker, an acidic gel breaker and a capsule shell; and the oxidation gel breaker and the bio-enzyme gel breaker and the bio-enzyme gel breaker and the acidic gel breaker are isolated by using wrapping membranes. By adopting the drilling completion fluid, a filtering shell can be thoroughly eliminated, the biodegradation flowback effect is good, a hydrocarbon reservoir can be prevented from damage since the fluid is nontoxic, the capacity of an oil and gas well can be increased to the maximum extent, and reservoir stratums can be sufficiently protected.

Description

technical field [0001] The invention relates to the field of oil recovery technology. More specifically, the present invention relates to an environment-friendly drilling and completion fluid with strong suppression bunching. Background technique [0002] During the drilling process, the drilling fluid forms a dense inner and outer filter cake on the well wall to prevent the solid and liquid phases from intruding into the reservoir. The existence of the filter cake greatly reduces the permeability of the near-wellbore zone, which must be developed before oil and gas are put into development. , to eliminate the filter cake to the greatest extent; therefore, after drilling and completing the well, the drilling and completion fluid circulation liquid is passed into the well, which always keeps in contact with the oil and gas layers. In order to protect the reservoir, the drilling and completion fluid should meet the conventional performance , (including density, acidity and al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/00C09K8/52
CPCC09K8/00C09K8/52C09K2208/12C09K2208/24C09K2208/26
Inventor 孟虎刘亚东朱国伟吴骏峰
Owner 新疆大德广源石油技术服务有限公司
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