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Method for optimizing and recycling waste drilling fluid

A technology of discarded drilling fluid and chemical flocculant, which is applied in horizontal well blocks and large borehole drilling operations, can solve the problem of inability to effectively remove micron-level and sub-micron-level solids, and achieve good social and environmental benefits, Effects of preventing sedimentation and coagulation

Inactive Publication Date: 2013-04-03
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems in the above-mentioned prior art, the present invention proposes a method for optimizing the treatment and reuse of waste drilling fluid, which is especially suitable for horizontal well drilling operations, greatly relieves the environmental pressure and reduces the cost of drilling fluid, and solves the problem of The existing technology cannot effectively remove the micron and submicron solid phase problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] As a preferred embodiment of the present invention, the present invention discloses a method for optimizing the reuse of waste drilling fluid, including the step of maintaining and storing waste drilling fluid. The step of maintaining and storing waste drilling fluid refers to: in terms of mass percentage of waste drilling fluid , Prepare 0.1-0.3% fungicide, 0.1-0.2% oxygen scavenger, 0.1-0.2% alkalinity control agent and 0.05-0.2% dispersant, for later use; follow the procedure below at normal temperature and pressure:

[0033] a. Add the bactericide in the above ratio to the waste drilling fluid every four days and use the 3M test piece to test the total number of bacteria. If the amount of bacteria exceeds 50cfu / ml, increase the bactericide to the maximum ratio;

[0034] b. Add the above ratio of oxygen scavenger to the waste drilling fluid every five days and measure the oxygen content in the waste drilling fluid to keep the oxygen content below 5mg / L;

[0035] c. A...

Embodiment 2

[0038] As another preferred embodiment of the present invention, on the basis of the above-mentioned examples, the present invention also includes e. Turn on the agitator or pump to circulate for 8-10 hours every day to prevent sedimentation from standing for a long time. The bactericide is a modified double quaternary ammonium salt of metronidazole. Described oxygen scavenger refers to diethylhydroxylamine. Described alkalinity control agent refers to sodium hydroxide solution. The dispersant refers to silicon fluoride viscosity reducer or lignin.

Embodiment 3

[0040] As the best embodiment of the present invention, the present invention also includes the step of reusing waste drilling fluid:

[0041] A. Remove the solid particles above 74μm in the waste drilling fluid through the 200-mesh screen cloth of the vibrating screen;

[0042] B. Then use a desander with a cyclone diameter of 200mm to remove the inferior solid phase with a particle size of 32-64μm, and then use a cyclone desilter with a diameter of 100mm to separate the inferior solid phase with a particle size between 16-32μm for desilting The overflow liquid from the upper part of the centrifuge is passed through a 3250r / min high-speed centrifuge to remove harmful solid phases larger than 3 μm, and finally the overflow liquid from the upper part of the centrifuge is recycled into the waste drilling fluid again. 0.2% chemical flocculant polyacrylamide (PAM) flocculates and settles 0.1-1μm sub-micron solid phase, through the above process, the content of harmful solid phase ca...

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PUM

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Abstract

The invention discloses a method for optimizing and recycling waste drilling fluid. The method for optimizing and recycling the waste drilling fluid comprises a waste drilling fluid maintaining and reserving step. The waste drilling fluid maintaining and reserving step refers to preparing 0.1-0.3 percent of sterilizing agent, 0.1-0.2 percent of deoxidant, 0.1-0.2 percent of basicity control agent and 0.05-0.2 percent of dispersing agent for later use by accounting for the mass percent of the waste drilling fluid. The waste drilling fluid maintaining and reserving step is performed at normal temperature and pressure according to the following procedures of: a, adding 0.1-0.3 percent of sterilizing agent to the waste drilling fluid every four days and performing a total bacterial count testing experiment by using a 3M testing slip; b, adding 0.1-0.2 percent of deoxidant to the waste drilling fluid every five days; c, adding 0.1-0.2 percent of basicity control agent to the waste drilling fluid every seven days and measuring the potential of hydrogen (pH) value of the waste drilling fluid to keep the pH between 10 and 11; and d, adding 0.05-0.2 percent of dispersing agent to the waste drilling fluid every seven days. The method is especially suitable for drilling operations of a horizontal well; the ambient pressure is greatly relieved and the cost of drilling fluid is reduced; and the problem that micron-sized and submicron-sized solid phases in the drilling fluid cannot be effectively removed in the prior art is solved.

Description

[0001] technical field [0002] The invention relates to the technical field of optimized treatment and reuse of waste drilling fluid, which can be applied to horizontal wells in Changqing Oilfield in the Ordos Basin and horizontal well blocks using similar drilling fluids, and is especially suitable for drilling large boreholes where the upper part consumes more drilling fluid. into homework. Background technique [0003] At present, the domestic treatment of waste drilling fluids is mainly to discharge them directly into the mud pool for sedimentation and solidification. Under this treatment method, the waste drilling fluids cannot be effectively reused, and the possibility of pollution to the surrounding environment will be increased after direct discharge, which generally causes enterprises to Environmental risks and cost pressures have further increased. [0004] With the increasing difficulty of drilling technology in the Changqing oilfield block located in the Ordos ...

Claims

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Application Information

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IPC IPC(8): E21B21/06C02F9/04C02F1/38C02F1/56
Inventor 林海黎金明郑玉辉金祥哲张振活郝超涂海海陈磊董海东凡帆蒋振伟赵雷赵向阳崔贵涛郭康
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD
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