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A method for resource recycling of oil-water well acidification flowback fluid

A flowback fluid and resource utilization technology, applied in earthwork drilling, wellbore/well components, etc., can solve the problems of large clean water consumption, difficult disposal of chemical sludge, residual acid and waste of water resources, etc., to reduce acid and The use of clear water, the realization of resource utilization, and the effect of reducing preparation costs

Active Publication Date: 2019-07-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can realize the harmless treatment of the acidified flowback liquid, the neutralization process needs to consume a large amount of liquid caustic soda (or solid caustic), and at the same time will produce a large amount of chemical sludge that is difficult to dispose of, and the treatment cost is as high as 200 yuan / ton or more
And it causes waste of residual acid and water resources in the acidified flowback liquid
Because the preparation of acidizing solution not only needs to consume industrial acid and additives, but also consumes a lot of water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Acidizing flowback fluid of well M in a block of Shengli Oilfield 30m 3 , the oil content is 800mg / L, the suspended matter content is 1500mg / L, the median particle size is 120μm, and the residual acid content is 3%. Utilize the method of the present invention to carry out resource recycling treatment to the acidification flowback liquid of M oil well, concrete steps are as follows:

[0021] (1) Settling the acidified flowback liquid for 1.0h and then reducing the oil content to 50mg / L, adding 40mg / L of cationic polymer degreaser, and then reducing the oil content to 1.8mg / L after air flotation treatment, The influence of crude oil on the filtration system is eliminated.

[0022] (2) After filtering the acidified flowback liquid after oil removal through a 30μm filter element, the content of suspended solids was reduced to 30mg / L, and the median particle size was 17μm. After filtering through a ceramic membrane with a filtration accuracy of 0.2μm, the content of suspend...

Embodiment 2

[0028] Acidizing flowback fluid of N oil well in a block of Shengli Oilfield 40m 3 , the oil content is 700mg / L, the suspended matter content is 1200mg / L, the median particle size is 100μm, and the residual acid content is 2.8%. Utilize the method of the present invention to carry out the recycling treatment of the acidification flowback fluid of the N oil well, the specific steps are as follows:

[0029] (1) Settling the acidified flowback liquid for 1.2 hours and then reducing the oil content to 40mg / L, adding 45mg / L of cationic polymer degreasing agent, and then reducing the oil content to 1.5mg / L after air flotation treatment, Eliminate the impact of crude oil on the filtration system.

[0030] (2) After filtering the acidified flowback fluid after oil removal through a 30μm filter element, the content of suspended solids is reduced to 20mg / L, and the median particle size is 12μm. To 0.6mg / L, the median particle size is 0.64μm, eliminating the influence of suspended soli...

Embodiment 3

[0036] Acidizing flowback fluid of U well in a block of Shengli Oilfield 50m 3 , the oil content is 850mg / L, the suspended matter content is 1300mg / L, the median particle size is 130μm, and the residual acid content is 3.2%. Utilize the method of the present invention to carry out the recycling treatment of the acidification flowback liquid of U oil well, the specific steps are as follows:

[0037](1) Settling the acidified flowback liquid for 1.5 hours and then reducing the oil content to 45 mg / L, adding 50 mg / L polyether polymer non-ionic polymer degreasing agent, and then after air flotation treatment, the oil content dropped to 1.7mg / L, eliminating the impact of crude oil on the filtration system.

[0038] (2) After filtering the acidified flowback fluid after oil removal through a 30μm filter element, the content of suspended solids decreased to 17mg / L, and the median particle size was 15μm, and then filtered through a ceramic membrane with a filtration accuracy of 0.2μm...

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PUM

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Abstract

The invention belongs to the technical field of oil-gas field surface engineering and environmental protection, and particularly relates to a method for resourcelization reuse of acidizing flowback fluid of oil and water wells. The method comprises the following steps that first, two-stage oil removal technology processing is conducted to eliminate influence of crude oil on a filtration system; second, two-stage filtration treatment is conducted to eliminate influence of suspended solids on a subsequent nanofiltration system; third, nanofiltration membrane treatment is conducted, calcium, magnesium and total iron ions in the acidizing flowback fluid are effectively removed; and industrial hydrochloric acid, a corrosion inhibitor and a discharge aiding agent are added, and an acidic fluid for acidizing operation is obtained. According to the method for resourcelization reuse of the acidizing flowback fluid of the oil and water wells, residual acid and water in the acidizing flowback fluid are fully utilized, acid and clear water required by preparation of the acidizing fluid are effectively reduced, clear water resources are saved, the preparation cost is reduced, and resourcelization utilization of the acidizing waste fluid is achieved; and meanwhile, the problems of high cost and large sludge production of acidizing flowback fluid treatment of the oil and water wells are solved. Therefore, the method for resourcelization reuse of the acidizing flowback fluid of the oil and water wells can be widely used in the technical field of acidizing flowback fluid treatment of the oil and water wells.

Description

technical field [0001] The invention belongs to the technical fields of oil and gas field surface engineering and environmental protection, and in particular relates to a resource recycling method for oil-water well acidification flowback fluid. Background technique [0002] Acidizing is the main measure for increasing oil well production and water well injection. It is to inject a certain type and concentration of acid liquid and a formula acid liquid composed of additives into the formation in a certain order to dissolve some minerals in the formation rock or blockages in pores and cracks, and improve formation. Or fracture permeability, improve seepage conditions, achieve the purpose of restoring or increasing oil and gas well productivity (or injection well injection capacity). According to statistics, about 1,000 acidizing wells are implemented in Shengli Oilfield each year, producing about 5×10 4 m 3 Acidified flowback. The acidified flowback liquid not only contain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B41/00
CPCE21B41/0057
Inventor 李希明袁长忠潘永强徐闯张守献徐鹏宋欣胡婧孙刚正谭晓明吴晓玲王新曹嫣镔
Owner CHINA PETROLEUM & CHEM CORP