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Solid-liquid separation gel breaker for waste polysulfide drilling fluid and preparation method thereof

A technology of solid-liquid separation and gel breaker, applied in chemical instruments and methods, dissolution, chemical/physical processes, etc., can solve the problems of inability to perform flocculation and other treatment steps, and the difficulty of colloidal structure.

Active Publication Date: 2011-05-25
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The waste drilling fluid produced by this stable network structure, its polymer wraps the colloidal particles produced by clay and a large amount of free water, and has a strong protective effect. It is difficult to destroy this stable colloidal structure. Inorganic type, organic type and composite type breakers are difficult to destroy to reach the destructive effect, making subsequent processing steps such as flocculation impossible

Method used

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  • Solid-liquid separation gel breaker for waste polysulfide drilling fluid and preparation method thereof
  • Solid-liquid separation gel breaker for waste polysulfide drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 34g of dimethyl malonate and 35g of triethylamine into a stainless steel high-temperature and high-pressure reactor, and raise the temperature to 80°C under constant stirring; then add 15g of potassium sodium tartrate; and dropwise add 5.5g of cyclopentane, At the same time, the temperature rises to 120°C, and is heated at a constant temperature of 120°C for 6 hours, and then the heating is stopped; when the temperature in the high-temperature and high-pressure reactor drops to 40°C, open the reactor, pour the reactants into ethanol, and wash with ethanol (ethanol can be reused), filtered and dried to obtain a white solid gel breaker for waste polysulfide drilling fluid.

[0024] Take the obtained gel breaker, carry out solid-liquid separation waste polysulfide drilling fluid treatment on the offshore platform, add 0.2wt% waste polysulfide drilling fluid gel breaker of total weight to waste polysulfide drilling fluid, significantly improve waste polysulfide drilling ...

Embodiment 2-5

[0026] The amount of each component of Examples 2-5 is shown in Table 1 below, and the preparation process is the same as that of Example 1.

[0027] Table 1

[0028]

[0029] Performance evaluation:

[0030] 0.2 wt% of the gel breaker prepared in Examples 1-5 was added to the waste polysulfide drilling fluid added with the conventional gel breaker potassium persulfate, and the gel breaking rate data are shown in Table 2.

[0031] Table 2

[0032]

[0033] Drilling fluid has a network structure. Due to the presence of sulfonated groups in the network structure of high temperature resistant polysulfide drilling fluid, its structure is more stable. How to destroy this stable network structure and destabilize it is the most efficient solidification method for waste polysulfide drilling fluid. The key to liquid separation technology. Potassium persulfate, a conventional gel breaker, is an oxidizing agent that destroys the network structure of drilling fluid through oxidat...

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Abstract

The invention relates to a solid-liquid separation gel breaker for waste polysulfide drilling fluid and a preparation method thereof. The solid-liquid separation gel breaker for waste polysulfide drilling fluid is prepared from the following steps of: a, adding 10 to 50 weight parts of ester substance selected from one or more of diethyl oxalate, dimethyl malenate and diethyl malonate and 20 to 70 weight parts of triethylamine into a reactor and raising the temperature to 80 DEG C under a continuously stirring condition; b, adding 10 to 20 weight parts of sodium potassium tartrate tetrahydrate and 3 to 10 weight parts of cyclopentane, raising the temperature to 120 DEG C, preserving heat at the temperature of 120 DEG C, heating for 6 hours and stopping heating; and c, when the temperaturein the reactor falls to be between 25 DEG C and 40 DEG C, taking a reactant out, washing with an alcohol organic solvent, filtering and drying.

Description

technical field [0001] The invention relates to a gel breaker for solid-liquid separation of waste polysulfide drilling fluid and a preparation method thereof. Background technique [0002] The polysulfonate drilling fluid not only maintains the excellent rheological properties of the polymer drilling fluid and the good salt, calcium and high temperature resistance characteristics of the sulfonated drilling fluid, but also makes up for the salt, calcium and water loss of the polymer drilling fluid. The wall performance is weak and the aggravated sulfonated drilling fluid is not suitable for jet drilling in deep wells, and it also has low price and excellent drilling fluid performance stability under high temperature conditions. Therefore, with the development of exploration and development to deep layers, polysulfide drilling fluid system has been widely used. [0003] With the extensive use of polysulfide drilling fluid, the waste produced by it has the characteristics of ...

Claims

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Application Information

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IPC IPC(8): B01F17/00C09K23/00
Inventor 赖晓晴朱战兵莫成孝孙金声项先忠屈沅治刘志东李英敏
Owner CHINA NAT OFFSHORE OIL CORP
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