CN105907419A

CN105907419A - Using method of sour crude oil emulsion breaker

Info

Publication number: CN105907419A
Application number: CN201610415756.1A
Authority: CN
Inventors: 周斌
Original assignee: Chengdu Gaopu Petroleum Engineering Technology Co Ltd
Current assignee: Chengdu Gaopu Petroleum Engineering Technology Co Ltd
Priority date: 2016-06-15
Filing date: 2016-06-15
Publication date: 2016-08-31

Abstract

The invention discloses a using method of a sour crude oil emulsion breaker. The problem that the ideal emulsion breaking effect cannot be achieved even when an existing emulsion breaker using amount is large is solved. The method comprises the steps that 1, a crude oil composite emulsion breaker is prepared, wherein the crude oil composite emulsion breaker is prepared from 48-52 wt% of polyoxyethylene polypropylene oxide block polyether, 0.8-1.2 wt% of sodium hexadecyl sulfonate, 5-8 wt% of d-Limonene, 10-15 wt% of C2-C6 carboxylic acid, and the balance water; 2, the crude oil composite emulsion breaker is added into crude oil according to the addition amount of 5-10 ppm. The method has the advantages of lowering the consumption amount and effectively improving the dehydration effect.

Description

A kind of using method of sour crudes demulsifier

Technical field

The present invention relates to a kind of demulsifier using method, be specifically related to the using method of a kind of sour crudes demulsifier.

Background technology

At present, offshore oilfield is in crude oil extraction enters into exploitation late stage, along with improving constantly of moisture content, such as mud Slurry is equally muddy, and clay content reaches about 5%, and owing to the particle diameter of clay is little, the surface area of granule is big, so absorbability is very By force, in in-place oil reservoir, along with the stirring of the oil extraction pump in recovery process, particle surface can wrap up one layer of crude oil, enters And form new emulsification system, referred to as " oil-mineral aggregates structure " (oil mineral aggregates, OMA).This knot The emulsification system of structure, in entering into crude Treatment system, can cause oil-water interfaces in each section of separator of crude oil unclear, three-phase separate From the device aqueous height of isolated oil phase, aqueous phase contains innage, and in some primary separator, the corrugated plating of design also results in blocking, Causing system " to be paralysed " eventually, sewage disposal system is too high owing to the oil droplet carried and clay are mixed in composition, causes processing load mistake Weight, there is " STOP " in the serious sewage operations system that also results in.

This fine insoluble solid particle has important effect to the stability of the new emulsification system of production fluid, typically Think that the clay particle of these different nominal particle size can form space net structure on profit molecular interface film, this of formation Plant structure and the coalescence between profit drop is played machinery inhibition, be that this OMA new system emulsion stability strengthens.For a long time The clay particle contacted with crude oil can adsorb the colloid in crude oil, asphalitine, makes surface of clay have a slightly water-wet, thus shadow Ring the stability of crude oil production fluid.

Existing demulsifier usage amount is relatively big, causes input cost to increase, and still existence can not reach preferable demulsification Problem, therefore need badly research and development a kind of better novel demulsifier being applicable to crude oil.

Summary of the invention

The technical problem to be solved is: existing demulsifier usage amount is relatively big, and still existence can not reach reason The problem thinking demulsification, it is provided that solve the using method of a kind of sour crudes demulsifier of the problems referred to above.

The present invention is achieved through the following technical solutions:

The using method of a kind of sour crudes demulsifier, step 1, prepares crude oil composite demulsifying agent, this crude oil composite demulsifying agent bag Include the right side of the sodium cetanesulfonate of polyoxyethylene polyoxypropylene block polyether, 0.8～1.2wt%, 5～the 8wt% of 48～52wt% Rotation limonene, 10～C2～the C6 carboxylic acid of 15wt%, remaining is water；

Step 2, crude oil composite demulsifying agent is joined in crude oil according to the addition of 5～10ppm.

Further, the concrete preparation process of described crude oil composite demulsifying agent is:

Step 1.1, in water add C2～C6 carboxylic acid, the most under agitation add sodium cetanesulfonate obtain mixing molten Liquid；

Step 1.2, is heated to 30～50 DEG C by mixed solution, again by polyoxyethylene polyoxypropylene block polyether in heating process Add in mixed solution and mix；

Step 1.3, after mix homogeneously and after temperature reaches 30～50 DEG C, adds dextrorotation limonene mix homogeneously, the coldest Make demulsifier the most afterwards.

Further, described C2～C6 carboxylic acid is ethanedioic acid, malonic acid, butanoic acid, succinic acid, 1,3-propanedicarboxylic acid, adipic acid, citric acid In one or more.

Further, described C2～C6 carboxylic acid is made up of the 1,3-propanedicarboxylic acid that weight ratio is 1: 2 and citric acid.

Preferably, described polyoxyethylene polyoxypropylene block polyether is the polyoxyethylene polyoxy of the numbered 9003-11-6 of CAS Propylene ether.

As optimal effectiveness, described polyoxyethylene polyoxypropylene block polyether is 51wt%, sodium cetanesulfonate is 0.8wt%, dextrorotation limonene be 6wt%, C2～C6 carboxylic acid be 15wt%.

The present invention compared with prior art, has such advantages as and beneficial effect:

1, the using method of the present invention can effectively reach to improve the purpose of dehydrating effect while reducing usage amount；

2, the demulsifier of the present invention has the advantage that rate of water loss is fast, degree of dehydration is high；And with low cost, preparation technology is simple, Steady quality.

Detailed description of the invention

For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment, the present invention is made Further describing in detail, the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, are not intended as this The restriction of invention.

Embodiment 1

A kind of using method of sour crudes demulsifier, including:

Step 1, preparing crude oil composite demulsifying agent, this crude oil composite demulsifying agent includes the polyoxyethylene polyoxypropylene of 48～52wt% C2～the C6 carboxylic of dextrorotation limonene, 10～the 15wt% of the sodium cetanesulfonate of block polyether, 0.8～1.2wt%, 5～8wt% Acid, remaining is water.

The concrete preparation process of described crude oil composite demulsifying agent is:

Step 1.3, after mix homogeneously and after temperature reaches 30～50 DEG C, adds dextrorotation limonene mix homogeneously and makes breakdown of emulsion Agent.

In the present embodiment this polyoxyethylene polyoxypropylene block polyether be 51wt%, sodium cetanesulfonate be 0.8wt%, the right side Rotation limonene be 6wt%, C2～C6 carboxylic acid be 15wt%；C2～C6 carboxylic acid is 1,3-propanedicarboxylic acid；Described polyoxyethylene polyoxypropylene block Polyethers is the polyoxyethylene poly-oxygen propylene aether of the numbered 9003-11-6 of CAS.

Embodiment 2

The present embodiment is with the difference of embodiment 1, and in the present embodiment, C2～C6 carboxylic acid is citric acid.

Embodiment 3

The present embodiment is with the difference of embodiment 1, in the present embodiment C2～C6 carboxylic acid be weight ratio be 1,3-propanedicarboxylic acid and the lemon of 1: 2 Lemon acid.

Embodiment 4

The present embodiment is with the difference of embodiment 3, and in the present embodiment, the ratio of each component is different；

In the present embodiment this polyoxyethylene polyoxypropylene block polyether be 48wt%, sodium cetanesulfonate be 1.2wt%, dextrorotation terpene Diene be 8wt%, C2～C6 carboxylic acid be 13wt%；Remaining is water.

Embodiment 5

In the present embodiment this polyoxyethylene polyoxypropylene block polyether be 52wt%, sodium cetanesulfonate be 1wt%, dextrorotation terpene two Alkene be 5wt%, C2～C6 carboxylic acid be 10wt%；C2～C6 carboxylic acid is 1,3-propanedicarboxylic acid；Remaining is water.

Embodiment 6

The present embodiment is the comparative example of embodiment 3-5, and the present embodiment is with the difference of embodiment 3-5, in the present embodiment The ratio of each component is different；

In the present embodiment this polyoxyethylene polyoxypropylene block polyether be 55wt%, sodium cetanesulfonate be 0.5wt%, dextrorotation terpene Diene be 10wt%, C2～C6 carboxylic acid be 6wt%；Remaining is water.

The demulsifier utilizing the present invention to prepare carries out contrast test, experimental temperature 50 to argillaceous composition oil well produced liquid DEG C, demulsifier adding consistency 5ppm, the dehydration rate (%) of each embodiment finished product demulsifier under the different dewatering time of detection, by de- Water rate (%) judges the quality of demulsifier, and concrete testing result is as shown in table 1, and blank group in table 1 below is without demulsifier Time result of the test.

Table 1

The moisture content (%) of emulsifying liquid layer after detection separates simultaneously, concrete testing result is as shown in table 2,

Table 2

By upper table 1, table 2, use the proportioning of the present invention, rate of water loss, degree of dehydration can be effectively improved, crude oil after dehydration Moisture content less.

Using the proportioning in embodiment 3, inquire into the contrast of the dehydrating effect situation that different usage amount causes, testing result is such as Shown in table 3.

Table 3

By upper table 3, use the usage amount of the present invention, can effectively reach while being effectively reduced usage amount to take off faster Water speed and higher dehydration rate.

By upper table 1, use the proportioning of the present invention, rate of water loss, degree of dehydration can be effectively improved.

Above-described detailed description of the invention, has been carried out the purpose of the present invention, technical scheme and beneficial effect further Describe in detail, be it should be understood that the detailed description of the invention that the foregoing is only the present invention, be not intended to limit the present invention Protection domain, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, all should comprise Within protection scope of the present invention.

Claims

1. the using method of a sour crudes demulsifier, it is characterised in that including:

Step 1, preparing crude oil composite demulsifying agent, this crude oil composite demulsifying agent includes the polyoxyethylene polyoxypropylene of 48～52wt% C2～the C6 carboxylic of dextrorotation limonene, 10～the 15wt% of the sodium cetanesulfonate of block polyether, 0.8～1.2wt%, 5～8wt% Acid, remaining is water；

The using method of a kind of sour crudes demulsifier the most according to claim 1, it is characterised in that described crude oil is combined The concrete preparation process of demulsifier is:

The using method of a kind of sour crudes demulsifier the most according to claim 1, it is characterised in that described C2～C6 carboxylic Acid is one or more in ethanedioic acid, malonic acid, butanoic acid, succinic acid, 1,3-propanedicarboxylic acid, adipic acid, citric acid.

The using method of a kind of sour crudes demulsifier the most according to claim 3, it is characterised in that described C2～C6 carboxylic Acid is made up of the 1,3-propanedicarboxylic acid that weight ratio is 1: 2 and citric acid.

5. according to the using method of a kind of sour crudes demulsifier described in claim 1 or 2 or 3 or 4, it is characterised in that institute State the polyoxyethylene poly-oxygen propylene aether that polyoxyethylene polyoxypropylene block polyether is the numbered 9003-11-6 of CAS.

The using method of a kind of sour crudes demulsifier the most according to claim 5, it is characterised in that described polyoxyethylene Oxypropylene block polyethers is 51wt%, sodium cetanesulfonate is 0.8wt%, dextrorotation limonene is that 6wt%, C2～C6 carboxylic acid is 15wt%。