CN101235280B

CN101235280B - Asphaltene deposition solid inhibitor for light oil exploitation

Info

Publication number: CN101235280B
Application number: CN2008100448934A
Authority: CN
Inventors: 陈馥; 梁尚斌; 陈明燕; 王世洁; 周成裕
Original assignee: Southwest Petroleum University
Current assignee: Southwest Petroleum University
Priority date: 2008-03-04
Filing date: 2008-03-04
Publication date: 2010-06-23
Anticipated expiration: 2028-03-04
Also published as: CN101235280A

Abstract

The invention relates to asphaltene deposition solid inhibitor in the exploitation of light oil which can effectively reduce and control asphaltene to gather and deposit in the light oil exploitation process, which is used on the crude oil exploitation, and can solve the problems of asphaltene deposition and precipitation in the light oil exploitation process. The technical scheme is that the inhibitor is formed by high-pressure polyethylene, diesel fuel and other auxiliary agent, and the product of asphaltene deposition solid inhibitor can be obtained through conducting molten agglutination reaction for 20-60% high-pressure polyethylene, 10-40% diesel fuel and 20-40% other auxiliary agent which comprises three medicaments of polyoxyethylene ether, sodium dodecylbenzene sulfonate and 2,6-ditrertiarybutyl p-methyl phenyl under the temperature of 100-130 DEG C to form even mixture before molding. The product can be direct thrown into drug-carrying container or be thrown by means of a drug-adding pipe, is slowly released as the scouring of bottom hole oil stream, which can effectively inhibit the gathering and growth of asphaltene, solves the problem of pipe column plugging-up problem in well, and has the advantages of high inhibiting efficiency, long cycle, small additive dose and low cost.

Description

A kind of lightweight oil exploitation medium pitch matter deposition solid inhibitor

Technical field:

The present invention relates to a kind of Oil extraction that is used for, can reduce effectively and control that bituminous matter is assembled and settled lightweight oil exploitation medium pitch matter deposition solid inhibitor in the lightweight oil recovery process, belong to the chemical reagent that use in lightweight oil exploitation field.

Background technology:

Heavy component bituminous matter and colloid cause occurring many serious problems in the crude production in the crude oil, comprise the formation of organic sediments in oil reservoir, oil well and the pipe laying equipment, have increased the production operation cost greatly.Therefore, it is an ancient and expensive problem in oil field that bitum precipitation is separated out, and from the petroleum industry initial stage, it is limiting always and is producing, and causes huge production loss.Carrying out along with the oil production process, colloid in the crude oil, bituminous matter, mechanical impurity compositions such as (greasy filth, oil-sands etc.) influence each other and act on, thereby it is coalescent in pit shaft, stop up flow string, cause the situation of oil well stop-spraying to happen occasionally, the interior tubing string of well is seriously stopped up, simultaneously because the obstruction of oil pipe slug formula, bring great difficulty to operation, flow chart and operating cost increase.Bitum deposition can be brought many disadvantageous effects to crude production, for preventing oil-line plugging, guarantee the oil well ordinary production, the measure of often taking at present mainly is at removing by the mechanical treatment (as mechanical scraping) and the method for chemical organic solvent in the viscous oil recovery process, but also there is certain limitation in these measures, be not suitable for sedimental removing in the stratum as mechanical means, the chemistry organic solvent is in order to stop asphaltene deposits, often need have more low-melting aromatoising substance, normally used have toluene and dimethylbenzene, concerning bituminous matter, they are effectively chemical cleaners, but this class aromatoising substance is too expensive, and contaminate environment, and has other many problems, as the cycle of removing is short, operation is frequent, and production cost increases, and there is very big danger or the like in operation.

Summary of the invention:

The objective of the invention is: in order to solve asphaltene deposits and the sedimentation problem in the lightweight oil recovery process, effectively suppress bitum gathering, grow up, avoided influencing each other and acting on of compositions such as the bituminous matter in the crude oil, colloid and mechanical impurity, a kind of lightweight oil exploitation of special proposition medium pitch matter deposition solid inhibitor.

In order to achieve the above object, the present invention is by the following technical solutions: a kind of lightweight oil exploitation medium pitch matter deposition solid inhibitor, comprise following each component, and its mass percent proportioning is:

High-pressure polyethylene 20-60%;

Diesel oil 10-40%;

Soxylat A 25-7 5-10%, Sodium dodecylbenzene sulfonate 6-15%,

2,6 ditertiary butyl p cresol 8-15%

Its preparation method is: with 2 of the Sodium dodecylbenzene sulfonate of the Soxylat A 25-7 of the diesel oil of the high-pressure polyethylene of 20-60%, 10-40%, 5-10%, 6-15%, 8-15%, the 6-ditertbutylparacresol mixes, at 100-130 ℃ of following fusion cementing reaction, form uniform mixture, after the shaper moulding, promptly get this lightweight oil exploitation medium pitch matter deposition solid inhibitor product.

This product is used for oilfield, pack into earlier in the medicine carrying device, adopt and directly drop into or adopt the dosing of chemical feed pipe mode, constantly washing away down of crude oil, slowly release enters in the oil stream subsequently, and flows with crude oil, suppressed separating out, depositing of crude oil medium pitch matter, can reach a dosing and reduce long-term effectively and control bituminous matter and in the lightweight oil recovery process, assemble and settled effect.Use temperature is at 30-120 ℃, and pressure is 0.1MPa-35Mpa, and effective concentration is 0.02-0.10%.

Ultimate principle of the present invention is: the macromolecular material among the present invention can slowly dissolve in oil, and the molecule diastole of original one-tenth rolled state is come.When lower concentration, form the reticulated structure that spreads all over whole crude oil system.Thereby the small bituminous matter crystal energy of separating out in the crude oil is attracted on these grids, with oil stream the bituminous matter crystal grain of separating out is taken away, stop or reduced that the bituminous matter crystalline is assembled, grown up, deposition process, generation prevents asphaltene deposits and sedimentary effect.Owing to can change crystalline structure, suppress the growth of bituminous matter crystalline, and can pass through its substituent spatial obstacle effect simultaneously, change crystal habit, produce the viscosity reduction effect, thereby reduce the tendency that forms grid structure and gel, reduce former oil freezing point, change the low-temperature fluidity of crude oil.In addition, because the effectively addings of auxiliary agent such as Soxylat A 25-7, Sodium dodecylbenzene sulfonate, 2,6 ditertiary butyl p cresol have suppressed the generation of crude oil medium pitch matter effectively, assemble, sedimentation is dispersed in the crude oil simultaneously preferably, takes away with oily stream.

Compared with prior art, the lightweight oil of this invention exploitation medium pitch matter deposition solid inhibitor the invention has the beneficial effects as follows: owing to can solve tubing string blocking problem in the well effectively, suppress efficient height, cycle long, add that dose is little, cost is low, reduced the settling number of purge greatly; The effect that has the asphaltene deposits of preventing, pour point depression, viscosity reduction simultaneously, thus the comprehensive cost of Oil extraction greatly reduced.Experimental result proves, adds a certain amount of lightweight oil exploitation medium pitch matter deposition solid inhibitor in crude oil, and effectively the deposition of crude oil for inhibiting medium pitch matter has positive meaning aspect crude production, the raising recovery ratio.

Embodiment:

The invention will be further described below in conjunction with specific embodiment.

Embodiment 1: the high-pressure polyethylene with 51%, 20% diesel oil, and other auxiliary agents are that 8% Soxylat A 25-7,11% Sodium dodecylbenzene sulfonate, 10% 2.6-ditertbutylparacresol are at 130 ℃ of following fusion cementing reactions, form uniform mixture, after the shaper moulding, promptly get this lightweight oil exploitation medium pitch matter deposition solid inhibitor.

Embodiment 2: the high-pressure polyethylene with 35%, 40% diesel oil, and other auxiliary agents be that 6% Soxylat A 25-7,8% Sodium dodecylbenzene sulfonate, 11% 2.6-ditertbutylparacresol are at 130 ℃ of following fusion cementing reactions, form uniform mixture, after the shaper moulding, promptly get this lightweight oil exploitation medium pitch matter deposition solid inhibitor.

Embodiment 3: the high-pressure polyethylene with 45%, 30% diesel oil, and other auxiliary agents be that 8% Soxylat A 25-7,9% Sodium dodecylbenzene sulfonate, 8% 2.6-ditertbutylparacresol are at 130 ℃ of following fusion cementing reactions, form uniform mixture, after the shaper moulding, promptly get this lightweight oil exploitation medium pitch matter deposition solid inhibitor.

It is as shown in table 1 that lightweight oil exploitation medium pitch matter deposition solid inhibitor suppresses efficiency analysis:

Table 1:

Lightweight oil exploitation medium pitch matter deposition solid inhibitor concentration (mg/L)	Suppress efficient (%)
	Suppress efficient (%)	0	0
50	56.8	0	0

Lightweight oil exploitation medium pitch matter deposition solid inhibitor concentration (mg/L)	Suppress efficient (%)
	Suppress efficient (%)	100	63.3
150	74.2	100	63.3
150	74.2	200	85.6
250	89.3	200	85.6
250	89.3	500	93.1

Lightweight oil exploitation medium pitch matter deposition solid inhibitor, from aggregated structure, be actually a kind of solid gel, in order to study its dissolved state under differing temps, carried out the mensuration of dissolution rate, its concrete experimental technique is: the lightweight oil exploitation medium pitch matter deposition solid inhibitor with certainweight places the crude oil of certain temperature to place the regular hour, took out samples weighing every 12 hours, claim at every turn weight with on take second place and differ from promptly 12 hours meltage for this reason.Concrete test-results is as shown in table 2:

Table 2:

Temperature (℃)	30	60	90	120
Temperature (℃)	30	60	90	120	Dissolution rate (mg/Lmin)	0.094	0.386	0.851	1.025

From above data as can be seen, lightweight oil exploitation medium pitch matter deposition solid inhibitor can dissolve in crude oil uniformly, this product is used for oilfield, pack in the medicine carrying device, constantly washing away down of crude oil, slowly release enters in the oil stream subsequently, and mobile with crude oil, suppressed separating out, depositing of crude oil medium pitch matter.

This lightweight oil exploitation medium pitch matter deposition solid suppresses can be according to on-the-spot needs, make different shapes, and can be according to oil well output, oil property, oil temperature, add dose by change and can change the dosing cycle, directly add or adopt the dosing of chemical feed pipe mode by adopting, can reach a dosing and reduce long-term effectively and control bituminous matter and in the lightweight oil recovery process, assemble and settled effect.

Claims

1. a lightweight oil is exploited medium pitch matter deposition solid inhibitor, and it is characterized in that: it comprises following each component, and its mass percent proportioning is:

High-pressure polyethylene 20-60%; Diesel oil 10-40%;

Soxylat A 25-7 5-10% Sodium dodecylbenzene sulfonate 6-15%,

2,6 ditertiary butyl p cresol 8-～15%;

2. asphaltene deposits solid inhibitor according to claim 1, it is characterized in that: the application of this asphaltene deposits solid inhibitor is, this product is used for oilfield, pack into earlier in the medicine carrying device, adopt and directly drop into or adopt the dosing of chemical feed pipe mode, in constantly washing away down of crude oil, slow release, enter subsequently in the oil stream and and flow, suppressed separating out, depositing of crude oil medium pitch matter with crude oil; Its use temperature is at 30-120 ℃, and pressure is 0.1MPa-35Mpa, and effective concentration is 0.02-0.10%.