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Compound gel breaker for processing abandoned drilling mud at sea

A drilling mud and treatment method technology, which is applied in the fields of mining wastewater treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of large coagulant addition, turbid water quality, high water content of mud cake, etc., and achieve low cost, Easy to purchase, high dehydration effect

Active Publication Date: 2014-12-03
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Limited by the technical level and equipment, most of the drilling mud cuttings (40,000-90,000 tons / year) produced in offshore oilfield operations are forced to be discharged directly, and a small amount of oil layer waste is transported to land for treatment; all oily waste mud is disposed of. Transported to land for processing, not only the cost of storage, transportation and processing is high, but also it is difficult to meet the standards
This situation not only limits the exploitation speed of offshore oil and gas resources, but also poses a huge threat to the development of the entire marine economy and society.
[0004] At present, there are many processing technologies for waste mud. Among them, the chemical enhanced solid-liquid separation process is simple and flexible, and has a high removal rate of suspended solids and colloidal substances. The method is mainly to add chemical coagulants to the waste mud to change the physical and chemical properties of the drilling mud system. , allowing finer particles to coalesce so that it can achieve solid-liquid separation under mechanically assisted separation conditions, but the main disadvantages of this method are: (1) The coagulant has poor gel breaking effect on waste mud and cannot completely break the gel , the muddy water is not easy to be separated mechanically, the water quality after separation is turbid, and the water content of the mud cake is high
(2) The amount of coagulant added is large
(3) The removal rate of COD is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The dehydration and dehydration treatment method of waste drilling mud:

[0025] (1) Preparation of oxidative cationic gel breaking system

[0026] At room temperature, add Al to the beaker 2 (SO 4 ) 3 (100g, 0.29mol), stirred in 300ml deionized water to dissolve it, then slowly added concentrated H 2 SO 4 (100g) and NaClO (20g), stirred and placed.

[0027] (2) Preparation of mud curing agent

[0028] At room temperature, sequentially weigh Al into the reactor 2 o 3 (15g, 0.147mol) and SiO 2 (10g, 0.167mol), add 100ml of water and stir evenly, place in a water bath at 60°C, stir for 10min, then add Ca(OH) 2 (50g, 0.676mol), stirred rapidly for 30min and left.

[0029] (3) Waste mud gel breaking and solidification treatment

[0030] Take 7500g of waste drilling mud in the container, first quickly add 296g of the oxidized cationic gel breaker prepared in step 1, stir evenly, then add 5g of 1‰ highly charged cationic organic flocculant, stir well, and finally a...

Embodiment 2

[0032] (1) Preparation of acidic cationic gel breaking system

[0033] At room temperature, add Al to the beaker 2 (SO 4 ) 3 (100g, 0.29mol), stirred in 300ml deionized water to dissolve it, then slowly added concentrated H 2 SO 4 (100g) and H 2 o 2 (15g), stirred and placed.

[0034] (2) Preparation of mud curing agent

[0035] At room temperature, sequentially weigh Al into the reactor 2 o 3 (15g, 0.147mol) and SiO 2 (10g, 0.167mol), add 100ml of water and stir evenly, place in a water bath at 60°C, stir for 10min, then add Ca(OH) 2 (50g, 0.676mol), stirred rapidly for 30min and left.

[0036] (3) Waste mud gel breaking and solidification treatment

[0037] Take 7500g of waste drilling mud in the container, first quickly add 296g of the oxidized cationic gel breaker prepared in step 1, stir evenly, then add 5g of 1‰ highly charged cationic organic flocculant, stir well, and finally add 242g of step 2 The prepared mud curing agent was stirred for 10 minutes, and ...

Embodiment 3

[0039] (1) Preparation of acidic cationic gel breaking system

[0040] At room temperature, add Al to the beaker 2 (SO 4 ) 3 (100g, 0.29mol), stirred in 300ml deionized water to dissolve it, then slowly added concentrated H 2 SO 4 (100g) and NaClO (20g), stirred and placed.

[0041] (2) Preparation of mud curing agent

[0042] At room temperature, sequentially weigh Al into the reactor 2 o 3 (15g, 0.147mol) and SiO 2 (10g, 0.167mol), add 100ml of water and stir evenly, place in a water bath at 60°C, stir for 10min, then add CaO (50g, 0.893mol), stir rapidly for 30min and let it stand.

[0043] (3) Waste mud gel breaking and solidification treatment

[0044] Take 7500g of waste drilling mud in the container, first quickly add 296g of the oxidized cationic gel breaker prepared in step 1, stir evenly, then add 5g of 1‰ highly charged cationic organic flocculant, stir well, and finally add 242g of step 2 The prepared mud curing agent was stirred for 10 minutes, and after...

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PUM

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Abstract

The invention discloses a compound gel breaker for processing abandoned drilling mud at sea. The compound gel breaker is characterized by comprising high-charge cationic organic flocculants, inorganic salt, acid, alkali, an oxidizing agent and water. The process comprises the following steps: 1, adding the inorganic salt Al2(SO4)3 and water to a reactor at room temperature, stirring to dissolve, and then slowly adding the acid and the oxidizing agent, keeping the PH at 2-3, and stirring for 3-5 minutes to stand; 2, adding Al2O3 and SiO2 to the reactor, adding water to evenly agitate; adding aqueous alkali with a certain concentration after standing for 10 minutes in water bath with temperature of 60 DEG C, and rapidly stirring for 30 minutes to stand; 3, taking a certain amount of abandoned drilling mud at sea to put into a container, firstly, adding a gel breaker, producing a lot of gases, and then adding the high-charge cationic organic flocculants to evenly stir after evenly stirring, finally adding a mud curing agent, keeping PH at 8, stirring for 10 minutes, carrying out mechanical separation, and separating to obtain mud effluent and a mud cake.

Description

technical field [0001] The invention relates to the technical field of offshore oil and gas drilling, in particular to a treatment method for breaking and dehydrating offshore waste drilling mud. Background technique [0002] At present, 32-33% of the global crude oil production comes from the sea. The global offshore oil production has tripled in the past 30 years and is expected to double in the next 5 years. China's offshore oil and gas reserves are 25.403 billion tons, accounting for 26.0% of the country's total oil and gas resources. occupy an increasingly important position in the national economy. [0003] Limited by the technical level and equipment, most of the drilling mud cuttings (40,000-90,000 tons / year) produced in offshore oilfield operations are forced to be discharged directly, and a small amount of oil layer waste is transported to land for treatment; all oily waste mud is disposed of. Transporting to land for processing not only requires high storage, tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C02F103/10
Inventor 李志元王素芳林蓓王腾张艳芳
Owner CHINA NAT OFFSHORE OIL CORP
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