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Drilling fluid prepared from oilfield produced water, and preparation method thereof

A technology for producing water and drilling fluid, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as environmental pollution, waste of water resources, etc., to delay corrosion rate, reduce drilling costs, and prevent sticking accidents. Effect

Inactive Publication Date: 2017-06-20
CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the statistical results of Changqing Oilfield in December 2014, the daily output of old oil wells was 161,161 tons of liquid, 69,064 tons of crude oil, and the comprehensive water cut reached 57.1%. Cause very serious environmental pollution and waste precious water resources

Method used

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  • Drilling fluid prepared from oilfield produced water, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] In order to reduce the waste of oilfield produced water, this embodiment provides a kind of drilling fluid prepared from oilfield produced water, including water and the following components in terms of mass percentage of water: 0.1~0.3% desulfurizer, 0.1~0.3% % calcium and magnesium ion remover, 0.3-0.5% anti-salt corrosion inhibitor, 0.2-0.3% viscosity raising agent, 0.2-0.5% flow pattern regulator, 0.2-0.3% flocculation coating agent, 0.8-1.1% dehydration reduction Agent, 1-2% anti-collapse agent, 2-5% liquid lubricant, 20-50% solid weighting agent, all of the above materials are commercially available.

[0025] A method for preparing drilling fluid prepared from oilfield produced water, characterized in that it at least includes the following steps:

[0026] Step 1: Pretreatment of oilfield produced water: including the following steps:

[0027] Step 1) Gradually add 0.1 to 0.3% desulfurizer in the produced water of the oilfield, stir evenly, and detect the hydroge...

Embodiment 2

[0035] This embodiment provides a drilling fluid prepared from oilfield produced water, including water and the following components in terms of mass percentage of water: 0.1 to 0.3% desulfurizer, 0.1 to 0.3% calcium and magnesium ion remover, 0.3 ~0.5% anti-salt corrosion inhibitor, 0.2~0.3% viscosity increasing agent, 0.2~0.5% flow pattern regulator, 0.2~0.3% flocculation coating agent, 0.8~1.1% fluid loss reducer, 1~2% anti-slump Agent, 2~5% liquid lubricant, 20~50% solid weighting agent, all above materials are commercially available.

[0036] A method for preparing drilling fluid prepared from oilfield produced water, characterized in that it at least includes the following steps:

[0037] Step 1: Pretreatment of oilfield produced water: including the following steps:

[0038] Step 1) Gradually add 0.1 to 0.3% desulfurizer in the produced water of the oilfield, stir evenly, and detect the hydrogen sulfide content with lead acetate test paper during the addition process. ...

Embodiment 3

[0050] This embodiment provides a drilling fluid prepared from oilfield produced water, including water and the following components in terms of mass percentage of water: 0.1 to 0.3% desulfurizer, 0.1 to 0.3% calcium and magnesium ion remover, 0.3 ~0.5% anti-salt corrosion inhibitor, 0.2~0.3% viscosity increasing agent, 0.2~0.5% flow pattern regulator, 0.2~0.3% flocculation coating agent, 0.8~1.1% fluid loss reducer, 1~2% anti-slump Agent, 2-5% liquid lubricant, 20-50% solid weighting agent.

[0051] A method for preparing drilling fluid prepared from oilfield produced water, characterized in that it at least includes the following steps:

[0052] Step 1: Pretreatment of oilfield produced water: including the following steps:

[0053] Step 1) Gradually add 0.1 to 0.3% desulfurizer in the produced water of the oilfield, stir evenly, and detect the hydrogen sulfide content with lead acetate test paper during the addition process. When the hydrogen sulfide content is zero, stop ...

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Abstract

The invention provides a drilling fluid prepared from oilfield produced water, and a preparation method thereof. The drilling fluid comprises water, a sulfur eliminator accounting for 0.1-0.3% of the mass of the water, a calcium and magnesium ion remover accounting for 0.1-0.3% of the mass of the water, a salt-resistant corrosion inhibitor accounting for 0.3-0.5% of the mass of the water, a tackifier accounting for 0.2-0.3% of the mass of the water, a flow pattern regulator accounting for 0.2-0.5% of the mass of the water, a flocculation coating agent accounting for 0.2-0.3% of the mass of the water, a fluid loss agent accounting for 0.8-1.1% of the mass of the water, an anti-sloughing agent accounting for 1-2% of the mass of the water, a liquid lubricant accounting for 2-5% of the mass of the water and a solid weighting agent accounting for 20-50% of the mass of the water. The drilling fluid prepared from oilfield produced water provides a new method for the treatment of oilfield water, and also has the advantages of reduction of the freshwater resource demand pressure of drilling fluids, reduction of the construction cost, increase of the economy benefits of oilfields, and realization of sustainable development of the oilfields.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a drilling fluid prepared from oil field produced water and a preparation method thereof. Background technique [0002] Most oilfields in my country have entered the middle and late stage of oil exploitation, and the water content in the produced fluid is 70% to 80%, and some oilfields even reach as high as 90%. The amount of wastewater produced by oil fields is enormous. According to the statistical results of Changqing Oilfield in December 2014, the daily output of old oil wells was 161,161 tons of liquid, 69,064 tons of crude oil per day, and the comprehensive water cut reached 57.1%, and some blocks even reached over 80%. Cause very serious environmental pollution, and wasted precious water resource. [0003] In view of the fact that more and more produced water is produced in Changqing Oilfield, and the discharge or injection into the formation is increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/02C09K2208/34
Inventor 赵海锋金祥哲王京光陈恩让尹敬军周珊珊郭康张长庚董海东凡帆王国庆丁磊
Owner CNPC SICHUAN GASOLINEEUM GEOPHYSICAL PROSPECTING ENG TECH RES INST
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