Oilfield drilling wastewater purifying and reusing treatment system and technology

A technology for wastewater purification and oil field drilling, which is applied in the fields of mining wastewater treatment, water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of polluting the environment, not being able to reuse, and high processing costs, and achieve low production costs, Prevents secondary pollution and has the effect of simple structure

Active Publication Date: 2016-07-27
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an oilfield drilling wastewater purification and reuse treatment system and process in order to solve the above-mentioned problems in the existing drilling wastewater treatment process, such as polluted environment, high treatment cost and inability to be reused.

Method used

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  • Oilfield drilling wastewater purifying and reusing treatment system and technology
  • Oilfield drilling wastewater purifying and reusing treatment system and technology
  • Oilfield drilling wastewater purifying and reusing treatment system and technology

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0023] see figure 1 , a treatment system for purification and reuse of oilfield drilling wastewater, comprising a water inlet pipe 1, a coagulation filter 2, a gravity settling chamber 3, an activated carbon filter 4, and a water outlet pipe 5 connected in sequence; the water inlet pipe 1 is provided with a capacity expansion mixing Section 6, the water inlet pipe 1 before the volume expansion mixing section 6 is provided with a first dosing port 7 and a second dosing port 8 arranged in sequence; the coagulation filter 2 includes a coagulation chamber communicated with the water inlet pipe 1 9. The filter screen 10 and the water collection chamber 11 communicated with the gravity settling chamber 3, the water collection chamber 11 is located outside the coagulation chamber 9, and the filter screen 10 is located between the coagulation chamber 9 and the water collection chamber 11; The connecting water pipe 12 between the chamber 11 and the gravity settling chamber 3 is provide...

Embodiment 1

[0040] Example 1: The above-mentioned purification and reuse treatment system and process are used to treat drilling wastewater in an oilfield. The water quality indicators of the drilling wastewater are shown in Table 1.

[0041] Table 1 Water quality index table of drilling wastewater in an oilfield

[0042] water quality index

Water quality index value before drilling wastewater treatment

unit

suspended matter

945

mg / L

CODcr

4853

mg / L

4 --> oil content

33

mg / L

dissolved oxygen

6.45

mg / L

h 2 S

13.5

mg / L

pH

11

not required

[0043] According to the water quality index of the above-mentioned drilling wastewater, the drilling wastewater is 3 Enter the water inlet pipe at a rate of 1 hour, add hydrogen sulfide inhibitor 80mg / L and bactericide sodium hypochlorite 10mg / L at the first dosing port, add aluminum sulfate 500mg / L and polyacrylamide 80mg / L at the second dos...

Embodiment 2

[0048] Example 2: The above-mentioned purification and reuse treatment system and process are used to treat the wastewater generated by a coalbed methane drilling well. The water quality indicators of the wastewater are shown in Table 3.

[0049] Table 3 Water quality index table of a coalbed methane drilling wastewater

[0050] water quality index

Water quality index value before drilling wastewater treatment

unit

suspended matter

867

mg / L

CODcr

3650

mg / L

oil content

13

mg / L

dissolved oxygen

6.75

mg / L

h 2 S

10.5

mg / L

5 --> pH

10

not required

[0051] According to the water quality index of the above-mentioned drilling wastewater, coalbed methane wastewater is 3 Enter the water inlet pipe at a rate of / hour, add hydrogen sulfide inhibitor 65mg / L and bactericide sodium hypochlorite 6mg / L at the first dosing port, add aluminum sulfate 350mg / L and polyacrylamide 50m...

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PUM

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Abstract

The invention relates to an oilfield drilling wastewater purifying and reusing treatment system and technology. The treatment system comprises a water inlet pipe, a coagulation filter, a gravity sedimentation chamber, an activated carbon filter and a water outlet pipe which are sequentially connected, wherein the water inlet pipe is provided with an expansion mixing section; a first dosing port and a second dosing port which are sequentially arranged are formed in the portion, in front of the expansion mixing section, of the water inlet pipe; the coagulation filter comprises a coagulation chamber communicated with the water inlet pipe, a filter screen and a water collection chamber communicated with the gravity sedimentation chamber, the water collection chamber is arranged outside the coagulation chamber, and the filter screen is located between the coagulation chamber and the water collection chamber; a connecting water pipe communicating the water collection chamber with the gravity sedimentation chamber is sequentially provided with a check valve and a third dosing port; the gravity sedimentation chamber is directly communicated with an inlet of the activated carbon filter, and an outlet of the activated carbon filter is communicated with the water outlet pipe. The chemical purifying process of drilling wastewater comprises the steps of efficient coagulation, disinfection and hydrogen sulfide removal, and the reusing treatment process comprises the steps of chemical deoxygenization, metal ion reduction and pipeline corrosion prevention. According to the treatment system, the structure is simple, the cost is low, the treatment technology is simple and convenient to operate, the technological steps are reasonable, integral treatment on the drilling wastewater is achieved, and the purified water can be directly drained and can be used as oilfield reinjection water after being conditioned.

Description

technical field [0001] The invention relates to the technical field of waste water treatment and utilization, in particular to an oil field drilling waste water purification and reuse treatment system and process. Background technique [0002] In the process of oil field development and production, a large amount of drilling wastewater will be produced. Drilling wastewater is the sewage generated during the drilling process. The main sources of drilling wastewater include the following categories: mud waste, cuttings and sewage generated during tripping operations, sewage generated from flushing ground drilling equipment and operating tools, and cooling water used for power equipment. The impurities and properties in drilling wastewater are closely related to the composition of drilling mud and the properties of rock formations. That is, different oil and gas fields, different drilling areas, different well depths, and different mud materials have different properties of the...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/10C02F101/10
CPCC02F1/001C02F1/50C02F1/52C02F1/5236C02F1/56C02F1/66C02F1/70C02F9/00C02F2101/101C02F2103/10
Inventor 高洪阁吕吉鑫冠小燕陈丽慧
Owner SHANDONG UNIV OF SCI & TECH
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