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A kind of defoamer for acidified fracturing flowback fluid

A technology of flowback fluid and defoamer, which is applied in the field of recyclable and reuse treatment of acidified fracturing flowback fluid, can solve problems such as difficult elimination, no relevant reports, impact of flowback fluid recovery and treatment, etc., and achieve reduction in treatment Difficulty, good compatibility, no effect on recovery and mixing performance

Active Publication Date: 2018-07-20
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As key technologies for the exploration and development of low-permeability oil and gas fields, fracturing and acidizing technologies have been popularized and applied in many domestic oil fields. Adding a foaming agent and injecting nitrogen gas during the construction process generates a large amount of foam to carry the liquid out, so the foam content in the acidified fracturing flowback fluid is high and stable, and it is not easy to eliminate
[0003] With the promulgation and implementation of the new environmental protection law, it is imminent to recover and dispose of the acidizing fracturing flowback fluid at the well site, but the existence of foam in the flowback fluid has a serious impact on the recovery and treatment of the flowback fluid. The defoaming problem of flowback liquid has not been reported yet

Method used

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  • A kind of defoamer for acidified fracturing flowback fluid
  • A kind of defoamer for acidified fracturing flowback fluid
  • A kind of defoamer for acidified fracturing flowback fluid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0027] A defoamer for acidified fracturing flowback fluid, composed according to the weight percentage of the following components:

[0028] Polysiloxane: 10~50%;

[0029] Polyethers: 10~30%;

[0030] Esters: 5~10%;

[0031] Fatty alcohol: 5~25%;

[0032] water: balance

[0033] In this example, for guar gum fracturing fluid flowback fluid, clean fracturing fluid flowback fluid and thickened acid acidified flowback fluid, when the amount of defoaming agent added is 0.3-0.8%, the defoaming time is not If it is longer than 60s, it will have no effect on the remixing performance of the flowback liquid.

Embodiment 2

[0035] A kind of defoamer for acidified fracturing flowback liquid, by weight percentage, the composition of this defoamer for acidified fracturing flowback liquid comprises:

[0036] Polysiloxane: 40%;

[0037] Polyethers: 15%;

[0038] Esters: 8%;

[0039] Fatty alcohol: 20%;

[0040] Water: balance.

[0041] In this example, the molecular weight of polysiloxane is 1000, the polyether is isomeric tridecyl alcohol atactic polyether TPE-1000, and the ester is glyceryl monostearate series, and lauric acid is specifically selected in this example Monoglycerides and fatty alcohols are selected from higher fatty alcohols with carbon atoms between 12 and 15. For guar gum fracturing fluid flowback fluid, when the amount of defoaming agent added is 0.5%, the defoaming time is 55s; And the compatibility with the flowback liquid is good, no precipitation, no stratification, and the temperature resistance of the flowback liquid before and after the addition of the defoamer is no mor...

Embodiment 3

[0045] A kind of defoamer for acidified fracturing flowback liquid, by weight percentage, the composition of this defoamer for acidified fracturing flowback liquid comprises:

[0046] Polysiloxane: 30%;

[0047] Polyethers: 25%;

[0048] Esters: 5%;

[0049] Higher fatty alcohol: 15%;

[0050] Water: balance.

[0051] In this embodiment, the molecular weight of polysiloxane is 3000, the polyether is polypropylene glycol PPG-2000, and the ester is polyglycerol fatty acid ester series. In this embodiment, two polyglycerol dipolyhydroxystearate is specifically selected. , the fatty alcohol is selected from high-level fatty alcohols with carbon atoms between 15 and 18. For guar gum fracturing fluid flowback fluid, when the amount of defoamer added is 0.7%, the defoaming time is 50s; The compatibility of the liquid discharge is good, no precipitation, no stratification, the difference in temperature resistance of the flowback liquid before and after the addition of the defoamer...

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Abstract

The invention provides an antifoaming agent for an acid fracturing returned liquid. The antifoaming agent comprises, by weight, 10-50% of polysiloxane, 10-30% of polyether, 5-10% of ester, 5-25% of fatty alcohol and the balance water. The antifoaming agent for an acid fracturing returned liquid has a fast antifoaming rate and antifoaming time of less than or equal to 60s, eliminates foam-caused adverse influence in returned liquid recovery and treatment, reduces returned liquid treatment difficulty, satisfies the environmental protection requirements and has good social and economic benefits. The antifoaming agent for an acid fracturing returned liquid can well match with the existing acid fracturing returned liquid in a Changqing zone and does not influence the recovered liquid performances.

Description

technical field [0001] The invention belongs to the technical field of recyclable and reuse treatment of acidizing fracturing flowback fluid used in oil and gas field development, and in particular relates to a defoamer for acidizing fracturing flowback fluid. Background technique [0002] As key technologies for the exploration and development of low-permeability oil and gas fields, fracturing and acidizing technologies have been popularized and applied in many domestic oil fields. Adding a foaming agent and injecting nitrogen gas during construction will generate a large amount of foam to carry the liquid out. Therefore, the foam content in the acidified fracturing flowback fluid is high and stable, and it is not easy to eliminate. [0003] With the promulgation and implementation of the new environmental protection law, it is imminent to recover and dispose of the acidizing fracturing flowback fluid at the well site, but the existence of foam in the flowback fluid has a s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/76
CPCC09K8/76
Inventor 邵秀丽曹欣廖乐军高燕王亚军王改红李婧陈亚联
Owner BC P INC CHINA NAT PETROLEUM CORP