Oil and gas field water-based drill cuttings soil conditioner, soil improvement method and improved soil

A technology for drilling cuttings and improver, which is applied in the field of solid waste treatment and resource utilization in oil and gas fields, can solve problems such as lack of mature technology, and achieve the effects of increasing the content of silt particles, being beneficial to soil structure, and reducing the content of sand particles.

Inactive Publication Date: 2020-05-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Only a few oilfields have used it as a resource. For example, China Petroleum South Petroleum Exploration and Development Co., Ltd. uses the technology of making unburned bricks from waste mud, and uses the treat

Method used

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  • Oil and gas field water-based drill cuttings soil conditioner, soil improvement method and improved soil
  • Oil and gas field water-based drill cuttings soil conditioner, soil improvement method and improved soil

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Well X23-78 in an oilfield in the west, the volume of water-based drilling cuttings produced during the drilling process is about 500m after drying treatment 3 , moisture content between 15-20%, density 1.5t / m 3 , and now carry out soil improvement.

[0042] 1. Soil improvement agent: biochar powder, anionic polyacrylamide and fly ash;

[0043] Soil improvement agent formula (by mass percentage): 60% biochar powder + 25% anionic polyacrylamide + 15% fly ash.

[0044] The biochar powder is a solid product produced by low-temperature pyrolysis of crop straws in an anoxic or anaerobic environment, and the particle size of the biochar powder is ≤0.02mm.

[0045] The molecular weight of the anionic polyacrylamide is 15 million.

[0046] The specific surface area of ​​the fly ash is 606m 2 / kg, in terms of volume percentage, the content of particles of 0-5 μm is 32%, the content of particles larger than 50 μm is 9.67%, and the balance is particles of 5-50 μm.

[0047] 2....

Embodiment 2

[0052] Well S33-59 in a gas field in the west, the volume of water-based drilling cuttings produced during the drilling process is about 700m after drying treatment 3 , moisture content between 10-15%, density 1.55t / m 3 , and now carry out soil improvement.

[0053] 1. Soil improvement agent: biochar powder, anionic polyacrylamide and fly ash

[0054] Soil improvement agent formula (by mass percentage): 65% biochar powder + 22% anionic polyacrylamide + 13% fly ash.

[0055] The biochar powder is a solid product produced by low-temperature pyrolysis of crop straws in an anoxic or anaerobic environment, and the particle size of the biochar powder is ≤0.02mm.

[0056] The average molecular weight of the polyacrylamide is 18 million.

[0057] The specific surface area of ​​the fly ash is 680m 2 / kg, in terms of volume percentage, the content of particles smaller than 5 μm is 35%, the content of particles larger than 50 μm is 10%, and the particle size of the remaining particle...

Embodiment 3

[0063] In a gas field well in the west, the volume of water-based drilling cuttings produced during the drilling process is about 800m after drying. 3 , moisture content between 15-20%, density 1.55t / m 3 , and now carry out soil improvement.

[0064] 1. Soil improvement agent: biochar powder, anionic polyacrylamide and fly ash

[0065] Soil improvement agent formula (by mass percentage): 63% biochar powder + 20% anionic polyacrylamide + 17% fly ash.

[0066] The biochar powder is a solid product produced by low-temperature pyrolysis of crop straws in an anoxic or anaerobic environment, and the particle size of the biochar powder is ≤0.02mm.

[0067] The average molecular weight of the polyacrylamide is 20 million.

[0068] The specific surface area of ​​the fly ash is 650m 2 / kg, in terms of volume percentage, the content of particles of 0-5 μm is 35%, the content of particles larger than 50 μm is 8.57%, and the balance is particles of 5-50 μm.

[0069] 2. Soil improvemen...

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Abstract

The invention discloses an oil and gas field water-based drill cuttings soil conditioner, a soil improvement method and improved soil. The soil conditioner is composed of biochar powder, polyacrylamide and fly ash, and meanwhile, the composition content of each substance in the soil conditioner is limited; the biochar in the soil conditioner has the characteristics of high pH value, high carbon-nitrogen ratio, high porosity and strong adsorption capacity to soil nutrients, is not easy to decompose and utilize by microorganisms, has long retention time, and is beneficial to improve soil carbonfixation and improve soil physicochemical properties; anionic polyacrylamide is a water-soluble high-molecular polymer, can effectively inhibit soil moisture evaporation and prevent water and soil loss, and can improve the soil structure and promote soil microbial development; and main components of the fly ash are similar to those of soil, particles are of porous honeycomb structures, the specific surface area is large, the fly ash has high adsorption activity, and the silt content of the soil can be increased.

Description

【Technical field】 [0001] The invention belongs to the technical field of solid waste treatment and resource utilization in oil and gas fields, and in particular relates to a water-based drilling cuttings soil improvement agent for oil and gas fields, a soil improvement method, and improved soil. 【Background technique】 [0002] Water-based drilling cuttings in oil and gas fields are formation rock debris discharged from the wellhead when water-based drilling fluid is used for drilling, and are general industrial solid wastes. A 3000m deep oil and gas well produces drilling cuttings of about 500-700m 3 , due to the lack of effective means of disposal, it can only occupy a large amount of land for stacking, which may have a certain impact on the local environment. [0003] Solid waste recycling technology is mainly divided into physical and chemical treatment technology, material separation and recovery technology, material recovery, land restoration technology and other types...

Claims

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Application Information

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IPC IPC(8): C09K17/40A01B77/00B09C1/08C09K101/00
CPCA01B77/00B09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 蒋继辉刘汉斌周立辉穆谦益冀忠伦同霄范婧李岩任小荣张海玲
Owner PETROCHINA CO LTD
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