Process for recycling oil-based mud and oil bases from oil-based mud drilling wastes

A technology for drilling waste and oil-based mud, which is applied in the petroleum industry, earth-moving drilling and wellbore flushing, etc., can solve the problems of high operating cost, long processing cycle, low cost, etc., and achieve significant environmental benefits, equipment investment and The effect of low operating costs and short processing times

Active Publication Date: 2014-05-07
四川博盛永业工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, oil-based mud or drilling cuttings are treated by incineration, cracking, biodegradation, etc. However, the incineration method requires a large investment, high operating costs, and waste gas generated during the incineration process is likely to cause secondary environmental pollution; The oil-bearing drilling cuttings with a relatively low amount are disposed of by landfill. The landfill method requires less investment, but it does not really eliminate oil pollutants in the oil-bearing drilling cuttings. The rainy season and the

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  • Process for recycling oil-based mud and oil bases from oil-based mud drilling wastes
  • Process for recycling oil-based mud and oil bases from oil-based mud drilling wastes
  • Process for recycling oil-based mud and oil bases from oil-based mud drilling wastes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]This example is located in an oil-based mud drilling project in an oilfield in Northwest China. In the treatment project of waste oil-based mud and oily drill cuttings, diesel-based drilling mud is used. The drilling formation is sandstone. The particle size of the drill cuttings is small and the mechanical strength of the particles is relatively high. Low, easily broken during centrifugation. The process includes centrifugal separation, reagent reaction and distillation condensation process. The design and approved treatment scale is 0.8m3 / h, and the treatment capacity, treatment effect and process stability of the process are investigated.

[0034] The raw material is first pre-separated through the feed screen, the screen aperture is 3cm, after passing through the feed screen, the maximum particle size of the solid phase is 2.6cm, the median particle size is about 1.0mm, and the liquid content of the solid phase is about 16 %.

[0035] The pre-separated raw material...

Embodiment 2

[0057] This example is located in an oil-based mud drilling project in an oilfield in Xinjiang. In the treatment project of waste oil-based mud and oily drill cuttings, the oil-based mud used is diesel-based mud, the drilling formation is mudstone, and the particle size of the drill cuttings is small , the mechanical strength of the particles is low, and they are easily broken during the centrifugal separation process. The design and approved treatment scale is 3.0m 3 / h, to investigate the processing capacity, processing effect and process stability of the process.

[0058] The raw material is first pre-separated through the feed screen, the screen aperture is 2.8cm, after passing through the feed screen, the maximum particle size of the solid phase is 2.2cm, the median particle size is about 0.8mm, and the liquid content of the solid phase is about 16%.

[0059] The pre-separated raw materials enter the centrifugal separation system, and the centrifugal separation process i...

Embodiment 3

[0078] This example is located in the oil-based mud drilling project in Xinjiang Oilfield. In the treatment project of waste oil-based mud and oily drill cuttings, the oil-based mud used is diesel-based mud, the drilling formation is sandstone, and the design and approved treatment scale is 1.5m 3 / h, to investigate the processing capacity, processing effect and process stability of the process.

[0079] The raw materials are first pre-separated through the feed screen with a pore size of 2 cm. After passing through the feed screen, the maximum particle size of the solid phase is 1.8 cm, the median particle size is about 0.6 mm, and the liquid content of the solid phase is about 16%.

[0080] The pre-separated raw materials enter the centrifugal separation system, and the centrifugal separation process is the coupling of centrifugal filtration and centrifugal sedimentation process. During the implementation of the centrifugal filtration process, filter screens with pore diame...

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Abstract

The invention belongs to the treatment field of oil-based mud or oil-based drilling cuttings in the well drilling of shale gas, tight gas and conventional oil gas fields, and in particular relates to a treatment recycling process for synchronously recycling the oil-based mud and oil bases from oil-based mud drilling wastes. The treatment recycling process is characterized by comprising the following steps: performing centrifugal separation on the oil-based mud; recycling the oil-based mud in a deep desorption manner via reagents at a normal temperature; and performing mixed distillation on the reagents containing oil and recycling the condensed reagents. According to the reaction process, the harmless treatment of the oil-based mud or the oil-based drilling cuttings can be realized, wherein the content of the oil in a final solid-phase product is less than 1%; the majority of oil ingredients in the oil-based mud or the oil-based drilling cuttings can be recycled, wherein the recycling rate of the oil bases is greater than 90%. The adopted reaction reagents can be almost recycled for reutilization, wherein the loss of the reagents is less than 2%. In addition, the treatment procedures are all performed under a normal temperature and a normal pressure, so that the treatment time is short; the secondary pollution is nearly avoided. The treatment recycling process is low in equipment investment and operation cost. Thus, the treatment recycling process is obvious in environmental, social and economic benefits.

Description

technical field [0001] The invention belongs to the field of treatment of oil-based mud or oil-based drilling cuttings in shale gas, tight gas and conventional oil and gas field drilling, and in particular relates to a process for synchronously recovering oil-based mud from oil-based mud drilling waste and oil-based treatment and recovery. [0002] Background technique [0003] In the drilling engineering of salt layer, anhydrite layer, miscellaneous salt layer and high temperature deep well, oil-based mud is widely used. During the drilling process, waste drilling mud, mud tank bottom mud and cementing mud will be produced. Drilling waste. This kind of waste is a complex multiphase system containing mineral oil, phenolic compounds and heavy metals. The main pollutants come from the oil base of oil-based mud. Currently, commonly used drilling oil bases include diesel base, white oil base, bio-oil base, etc. base, mineral oil base, synthetic oil base, etc. Aromatic hydroca...

Claims

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Application Information

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IPC IPC(8): C10G1/00C10G1/02E21B21/06
Inventor 王兵黎跃东任宏洋张聪
Owner 四川博盛永业工程技术有限公司
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