Low-toxicity or nontoxic multi-functional drilling fluid finishing agent

A drilling fluid treatment agent and multi-functional technology, applied in the field of water-based drilling fluids, can solve problems such as failure to meet environmental protection requirements, toxicity, and farmers' reprimand, and achieve the effects of no environmental pollution, reduced filtration loss, and good anti-seize

Inactive Publication Date: 2010-06-16
XINJIANG GRAND OILFIELD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, single agents that are non-toxic, non-polluting or even low-toxic are rare, and even if there are, they cannot meet environmental protection requirements.
Judging from the current use of water-based drilling fluids, drilling fluids and their filtrates have more or less toxicity problems, and farmers are often reprimanded and punished. Coupled with strict monitoring of environmental regulations, drilling fluid technology is forced to Development in the direction of low (no) toxicity

Method used

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  • Low-toxicity or nontoxic multi-functional drilling fluid finishing agent
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  • Low-toxicity or nontoxic multi-functional drilling fluid finishing agent

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1: Preparation method of multifunctional drilling fluid treatment agent MFA-2

[0023] First put 100g of water into the reaction tank 1, start the multi-stage pump 2, open the valve 10, the water enters the reaction tank 1 through the pump pipe 6 according to the circulation flow direction 9 from the inlet pump pipe 5, and slowly adds 3g of dispersing agent MV-CMC and 2g glue protection agent JT 888 ;After completely dissolving, add 3.75g of emulsifier OP-10 at one time, start the multi-stage pump for 2 cycles for 10 minutes, then slowly add 68g of liquid paraffin, emulsify for 30 minutes after adding, add the sample to water and stir until the liquid paraffin can be dissolved in water until it is dispersed; then add 2g of defoamer YHP-008 at one time, and continue to circulate for 5-10 minutes, take a sample and add it to water and stir until the sample can be dispersed in water without foaming; finally add 1g of 36% formaldehyde at one time, Recirculating for...

example 2

[0024] Example 2: Effect of MFA-2 in drilling fluid (see Table 2, Table 3)

[0025] Table 2 MFA-2 drilling fluid properties

[0026]

[0027] Note: 1. The original slurry is 4% Anqiu secondary soil slurry. 2. Temperature measurement: 25°C.

[0028] Table 3 Other characteristics of MFA-2 drilling fluid

[0029]

[0030] Note: 1. Lubrication coefficient is measured by extreme pressure lubrication instrument; 2. Plugging capacity is measured by sand packing method, the condition is 500Psi (600Psi). 80℃ / 30min, and then the permeability K is measured with clean water under different pressures w ; 3. Recovery rate R 40 Choose 6-10 mesh Sichuan red layer soil, and pass 40 mesh to get the result.

[0031] It can be seen from the results in Table 2 and Table 3 that MFA-2 has a good fluid loss reduction effect, and the reduction rate can reach about 50% (addition amount 3%). MFA-2 is added into the original slurry as soft deformable particles, which can effectively seal the f...

example 3

[0032] Example 3: Fluorescence level, toxicity of MFA-2

[0033]Weigh 0.5g of the sample into a clean test tube, add 5ml of chloroform, stir slowly for 5 minutes, compare it with the standard colorimetric tube under the irradiation of a fluorescent lamp, and determine the fluorescence level of MFA-2. The measurement result is level 1, which can be seen The fluorescence level of MFA-2 is very low, far less than level 3, and it is a non-fluorescent level product (the fluorescence levels of sulfonated asphalt HL-II and SAS are much higher than level 10 and up to level 14 when detected by the same method), therefore, MFA -2 added to drilling fluid has no effect on geological logging, and can be used in all production wells and exploration wells.

[0034] Using GB / T13267-91 "Determination of Acute Toxicity of Water Quality Substances to Freshwater Fish", the acute toxicity of MFA-2 to goldfish was evaluated. This study was completed by the Sichuan Provincial Environmental Monitori...

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Abstract

The invention relates to a low-toxicity or nontoxic multi-functional drilling fluid finishing agent used for the drilling operation of an oil-gas field. The invention has no pollution to the environment, is nontoxic and has the functions of preventing collapse, blocking, lowering the water loss, protecting the wall of a well, protecting an oil-gas layer, generating no fluorescence and the like. The invention has the following technical scheme of: firstly, putting water into a reaction tank, adding a dispersant MV-CMC and a glue protection agent JT888 slowly in circulation, adding an emulsifying agent OP-10 once after dissolving, circulating for 10 minutes, adding liquid paraffin slowly and then emulsifying for 30 minutes; then, adding a defoaming agent YHP-008 and then circulating for 5-10 minutes continuously; and finally, adding 36% of formaldehyde as a preservative and then circulating for 5 minutes so as to obtain a product of the low-toxicity or nontoxic multi-functional drillingfluid finishing agent. The finishing agent is used for water-base drilling fluid, especially polymer drilling fluid, can effectively improve the quality of a mud cake of the water-base drilling fluid, lowers the water loss, has the functions of clamping prevention, lubrication, collapse prevention, blockage and the like, has no pollution to the environment and can be widely used in the drilling operation.

Description

technical field [0001] The invention relates to a water-based drilling fluid used in drilling operations in oil and gas fields, in particular to a low-toxic or non-toxic multifunctional drilling fluid treatment agent for polymer drilling fluid. Background technique [0002] With the development of drilling technology, higher and higher requirements are put forward for the properties and performance of drilling fluid. With the increasingly stringent environmental regulations, the oil industry is urged to use less toxic oil-based drilling fluids and toxic water-based drilling fluids. As an alternative, low-toxic or non-toxic water-based drilling fluids and fake oil-based drilling fluids (such as synthetic-based drilling fluids) are used. Since the base fluids of synthetic-based drilling fluids are mainly synthetic hydrocarbons, they can be degraded aerobically and remain on the beach for many years, slowly affecting the environment; they can also be degraded anaerobically, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035
Inventor 王平全张杰
Owner XINJIANG GRAND OILFIELD TECH
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