CN102277143A - W/O/W type active viscous oil blocking agent used in oil well, and preparation method thereof - Google Patents
W/O/W type active viscous oil blocking agent used in oil well, and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a W/O/W type active viscous oil blocking agent. The blocking agent comprises internal phase water, viscous oil and external phase water. A nonionic surfactant is adopted between the internal phase water and the viscous oil. An ionic surfactant is adopted between the viscous oil and the external phase water. According to the invention, a W/O/W composite structure is adopted, W/O with a relatively large viscosity is coated by the external phase water layer, such that defects in prior arts of high viscosity, high construction pressure and poor selectivity upon an oil-water layer during an active viscous oil blocking agent injection process are overcome. With the blocking agent provided by the invention, the ground fluidity is good, and the injection pressure is low. When the blocking agent enters the stratum, the emulsion is demulsified, and W/O emulsion with a high viscosity is released, such that oil well water exits can be effectively blocked, and defects of existing active viscous oil blocking agents are overcome. The technical scheme provided by the invention is especially suitable for technical features of offshore oilfields.
Description
Technical field
The present invention relates to a kind of oil well with active viscous crude blocking agent, particularly relate to active viscous crude blocking agent of a kind of W/O/W type and preparation method.
Background technology
Well water is a ubiquitous problem in the oilfield development process.The harm that well water caused is fairly obvious, as reducing oil offtake, increases water production rate, improves the expense of water treatment etc.For addressing this problem, people adopt diversified blocking agent to carry out water blockoff, and blocking agent comprises: cement, resin, particle, gel, inorganic precipitation etc.But top described blocking agent does not have the not characteristic of stifled oil of real water blockoff.
For reducing the injury of blocking agent to oil reservoir, people do a lot of work, wherein the viscous crude blocking agent is one of selectivity blocking agent few in number of generally acknowledging at present, can't block under the situations such as envelope, water exit are not clear in the oil well operation, and use viscous crude blocking agent can obtain good effect.Active viscous crude blocking agent is the high viscosity viscous crude that is added with an amount of water-in-oil emulsifier, active viscous crude under high pressure injects oil-well strata, the active viscous crude that enters oily discharge orifice road will be dissolved in in-place oil and from oil well produced, the active viscous crude in ingoing stream duct mixes and emulsification with the local water of seepage flow or injection water, form water-in-oil emulsion, viscosity increases, and suppresses the water layer water outlet.
But some problems have in use appearred in active viscous crude blocking agent, and main performance is: the first, and active viscous crude blocking agent is external phase with the viscous crude, the injection pressure height.Active viscosity of thickened oil is higher, and generally more than 300mPa.s, therefore in construction process, viscous crude and the friction resistance that injects between pipeline, viscous crude and the stratum are very big, cause the surface injection pressure height.The second, active viscous crude blocking agent is the oil base blocking agent, in injection process, can at first enter the high oil reservoir position of oil reservoir or oil saturation, enters the corresponding minimizing of viscous crude blocking agent of well water layer position, thereby influences the validity period of water blockoff.
For solving the shortcoming of active viscous crude, people have worked out water bag viscous crude blocking agent.Viscous crude is made water bag viscous oil emulsion, and breakdown of emulsion takes place on the stratum behind the stratum in injection, discharges viscous crude, suppresses the water layer water outlet.It is to rely on the viscous crude oneself viscosity to come water blockoff, and water external emulsion is external phase with water, and viscosity is low during injection, easily injects, but is subjected to the influence of the viscometric properties of viscous crude own, and water plugging effect is restricted.
For addressing the above problem, people have worked out viscous oil emulsion phase inversion water blockoff again.Make with 100 ℃～110 ℃ viscous crude of temperature and water external emulsion earlier and contain 30% water external emulsion, add 3%～10% wilkinite and a small amount of water-in-oil emulsifier then, mixing the back injects underground, after entering the stratum, the water external emulsion phase inversion is the high viscosity Water in Oil emulsion, the shutoff water layer.It has overcome the shortcoming of above-mentioned water bag viscous crude blocking agent to a certain extent, the viewpoint of tackify in the stratum has been proposed, but because the stirring action that oil reservoir seepage flow is provided is very faint, therefore, under formation condition, viscous crude is difficult to spontaneous emulsification and becomes W/O milk sap, simultaneously, the phase inversion agent in this technology is mainly the solid particulate wilkinite, and viscous crude field is screen casing-gravel filling sand prevention completion mode of generally adopting of offshore oilfield particularly, the granule type blocking agent can't be passed through, and use is restricted.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art, a kind of oil well active viscous crude blocking agent of W/O/W type that is suitable for is provided.
Second purpose of the present invention is to provide the preparation method of the active viscous crude blocking agent of a kind of W/O/W type.
Purpose of the present invention is achieved by following technical proposals:
A kind of oil well that is suitable for comprises Nei Xiangshui, viscous crude and foreign minister's water with the active viscous crude blocking agent of W/O/W type, uses nonionic surface active agent between described interior phase water and the viscous crude, uses ionogenic surfactant between described viscous crude and the foreign minister's water.
In the described viscous crude, gum asphaltic content is not less than 30wt%.
Described nonionic surface active agent is a kind of in sorbitan fatty acid ester, Span60, the polyoxyethylene nonylphenol ether-4.
Described ionogenic surfactant is a kind of in dodecyl sodium soap, sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, the petroleum sodium sulfonate.
A kind of preparation method who is suitable for oil well with the active viscous crude blocking agent of W/O/W type, carry out according to following step:
(1) water-in-oil emulsifier of its weight 0.5%～5% of adding in viscous crude mixes, and adds the preparation water of viscous crude weight 10%～50% again, stirs, and makes the w/o type milk sap of phase water in containing;
(2) oil-water emulsifiers of its weight 1%～3% of adding in the preparation water after mixing, is prepared water as the foreign minister and is used;
The foreign minister of w/o type milk sap adding step (2) preparation that contains interior phase water that (3) step (1) is prepared prepares in the water, wherein the foreign minister of step (2) preparation prepare the weight of water be phase water in containing of step (1) preparation w/o type milk sap weight 50%～100%, stir and promptly obtain a kind of oil well with the active viscous crude blocking agent of W/O/W type.
In the described viscous crude, gum asphaltic content is not less than 30wt%.
Described water-in-oil emulsifier is a nonionic surface active agent, a kind of as in sorbitan fatty acid ester, Span60, the polyoxyethylene nonylphenol ether-4.
Described oil-water emulsifiers is an ionogenic surfactant, a kind of as in dodecyl sodium soap, sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, petroleum sodium sulfonate, the dodecyl carboxylic acid sodium.
Described configuration water is the water behind the calcium ions and magnesium ions in the complexing water, and use therein complexing agent is a kind of in disodium ethylene diamine tetraacetate, quadrol hydroxyethyl nitrilotriacetic, the diethylenetriamine pentaacetic acid; When being configured,, be that 1: 1 ratio adds complexing agent in calcium, magnesium ion quantity sum and complexing agent mol ratio, with calcium ions and magnesium ions in the complexing water at first according to the calcium ions and magnesium ions total content in the water.
The active viscous crude blocking agent of a kind of W/O/W type of the present invention, utilize the output viscous crude in this well, this oil field or other oil fields to be raw material, at first carry out thickening, then the further aquation of the oil after the thickening is dispersed into low viscous water-in-oil-in-water milk sap (being the active viscous crude blocking agent of W/O/W type) by the mode that forms water-in-oil emulsion.In the oil reservoir injection process, major part in the viscous crude blocking agent of the present invention can initiatively select to enter the saturate water exit of well water, because the oil-water emulsifiers and the calcium ions and magnesium ions in the water layer of ionogenic surfactant are had an effect (the at first calcium ions and magnesium ions in the complexing water), and then lost efficacy, so the water-in-oil emulsion that can progressively discharge thickening in migration process is (because water-in-oil emulsifier is a nonionic surface active agent, can keep the stable of water-in-oil emulsion), reach the purpose of shutoff well water passage; On the other hand, small portion meeting oil reservoir in the viscous crude blocking agent of the present invention is because the oil-water emulsifiers of ionogenic surfactant can play effect lubricated and reduction viscosity, so that the viscous crude blocking agent is dissolved in crude oil, and, avoided influence to oil reservoir with output crude oil outflow ground.
Technical scheme of the present invention is owing to adopt the composite structure of W/O/W, adopt foreign minister's water layer to wrap up the bigger W/O of viscosity, it is big to overcome in the prior art active viscous crude blocking agent injection process viscosity, the operation pressure height, shortcoming to the oil-water-layer poor selectivity, has the ground good fluidity, injection pressure is low, enter emulsion breakdown behind the stratum and discharge the characteristics of high viscosity W/O milk sap, effective shutoff well water layer position, remedied the deficiency of present active viscous crude blocking agent, need to prove that technical scheme of the present invention is particularly suitable for the process characteristic of offshore oilfield, avoid the disaster hidden-trouble that in the land construction heating viscosity reduction technology of high viscosity emulsion brought, can solve the offshore oilfield problem of later stage well water aborning better, have a extensive future.
Embodiment
Further specify technical scheme of the present invention below in conjunction with specific embodiment.
Embodiment 1
Get Bohai SZ 36-1 oil field J platform output sewage, calcium, the magnesium ion content sum measured in the sewage are 420mg/L, by calcium, magnesium ion in the disodium EDTA complexing water of 1: 1 ratio of the mol ratio adding 4515mg/L of disodium ethylene diamine tetraacetate and calcium ions and magnesium ions sum.
The polyoxyethylene nonylphenol ether-4 that in the J platform output viscous crude of Bohai SZ 36-1 oil field, adds 3wt%, mix, slowly add the preparation water of viscous crude weight 30wt% then, in adding the water process, constantly stir simultaneously, stir 50 fens kinds, make the w/o type milk sap of phase water 30wt% in containing.
After processing, add the 2wt% sodium laurylsulfonate in the preparation water, mix the back and prepare the water use as the foreign minister; The foreign minister who the w/o type milk sap of phase water in the containing of preparation is added preparation prepares in the water, and wherein Zhi Bei the foreign minister weight of preparing water stirred 10 minutes for 80% of the w/o type milk sap weight that containing interior phase water of preparation, obtained W/O/W type viscous crude blocking agent.
Embodiment 2
In the Nan Bao 35-2 field produces sewage of the 5000Kg Bohai Sea, the mol ratio according to complexing agent and calcium ions and magnesium ions sum behind the calcium in the measurement sewage, the magnesium ion content adds the disodium ethylene diamine tetraacetate of 2.42Kg as the preparation water at 1: 1.
The Span60 that in the fort 35-2 oil-field thick-oil of 3500Kg south, adds 105Kg, mix, slowly add 1500Kg preparation water then, in adding the water process, constantly stir simultaneously, stir 20 fens kinds, be made into the w/o type milk sap of 5105Kg moisture 29.4%.
In 3400Kg preparation water, add 70Kg dodecyl carboxylic acid sodium, after mixing; The 5105Kg w/o type milk sap of preparation is added wherein, stir 10 fens kinds, make the W/O/W type viscous crude blocking agent of 8575Kg.
Embodiment 3
Get Bohai SZ 36-1 oil field J platform output sewage, calcium, the magnesium ion content sum measured in the sewage are 420mg/L, by calcium, magnesium ion in the disodium EDTA complexing water of 1: 1 ratio of the mol ratio adding 4515mg/L of disodium ethylene diamine tetraacetate and calcium ions and magnesium ions sum.
The sorbitan fatty acid ester that in the J platform output viscous crude of Bohai SZ 36-1 oil field, adds 5wt%, mix, slowly add the preparation water of viscous crude weight 50wt% then, in adding the water process, constantly stir simultaneously, stir 50 fens kinds, make the w/o type milk sap of phase water 40wt% in containing.
After processing, add 3wt% dodecyl sodium soap in the preparation water, mix the back and prepare the water use as the foreign minister; The foreign minister who the w/o type milk sap of phase water in the containing of preparation is added preparation prepares in the water, and wherein Zhi Bei the foreign minister weight of preparing water stirred 10 minutes for 100% of the w/o type milk sap weight that containing interior phase water of preparation, obtained W/O/W type viscous crude blocking agent.
Embodiment 4
Get Bohai SZ 36-1 oil field J platform output sewage, calcium, the magnesium ion content sum measured in the sewage are 420mg/L, by calcium, magnesium ion in the disodium EDTA complexing water of 1: 1 ratio of the mol ratio adding 4515mg/L of disodium ethylene diamine tetraacetate and calcium ions and magnesium ions sum.
The sorbitan fatty acid ester that in the J platform output viscous crude of Bohai SZ 36-1 oil field, adds 0.5wt%, mix, the preparation water that slowly adds viscous crude weight 10wt% then, in adding the water process, constantly stir simultaneously, stirred 50 minutes, and made the w/o type milk sap of phase water 10wt% in containing.
After processing, add the 1wt% Sodium dodecylbenzene sulfonate in the preparation water, mix the back and prepare the water use as the foreign minister; The foreign minister who the w/o type milk sap of phase water in the containing of preparation is added preparation prepares in the water, and wherein Zhi Bei the foreign minister weight of preparing water stirred 10 minutes for 50% of the w/o type milk sap weight that containing interior phase water of preparation, obtained W/O/W type viscous crude blocking agent.
On February 26th, 2009 was implemented W/O/W type viscous crude blocking agent water-blocking operation at Nan Bao 35-2 oil field, Bohai Sea A18 well.In whole construction course, use 360 tons of production wastes (after carrying out the calcium ions and magnesium ions complexing, use as the configuration water), 260 tons of the self-produced crude oil in this oil field (as the viscous crude raw material), 5.2 tons of Span60s, 3.75 tons of dodecyl carboxylic acid sodium, disodium EDTA 175Kg, be prepared W/O/W viscous crude blocking agent according to technical scheme of the present invention, carry out plugging function then.Originally injection pressure is 2-3MPa, but progressively discharge the water-in-oil emulsion of thickening along with blocking agent in migration process, injection pressure slowly rises, injection pressure when entire job finishes reaches 5.8MPa, the well water amount is reduced to 60wt% by 86wt%, and oil well daily output crude oil is steadily increasing, and this explanation W/O/W type viscous crude blocking agent water blockoff is in the aboveground achieving success of A18, substantially finished shutoff, and oil reservoir has not been damaged well water layer position.
More than the present invention has been done exemplary description; should be noted that; under the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (10)
1. one kind is suitable for oil well with the active viscous crude blocking agent of W/O/W type, it is characterized in that, comprises Nei Xiangshui, viscous crude and foreign minister's water, uses nonionic surface active agent between described interior phase water and the viscous crude, uses ionogenic surfactant between described viscous crude and the foreign minister's water.
2. a kind of oil well that is suitable for according to claim 1 is characterized in that with the active viscous crude blocking agent of W/O/W type in the described viscous crude, gum asphaltic content is not less than 30wt%.
3. a kind of oil well that is suitable for according to claim 1 is characterized in that with the active viscous crude blocking agent of W/O/W type, and described nonionic surface active agent is a kind of in sorbitan fatty acid ester, Span60, the polyoxyethylene nonylphenol ether-4; Described ionogenic surfactant is a kind of in dodecyl sodium soap, sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, the petroleum sodium sulfonate.
4. a preparation method who is suitable for oil well with the active viscous crude blocking agent of W/O/W type is characterized in that, carries out according to following step:
(1) water-in-oil emulsifier of its weight 0.5%～5% of adding in viscous crude mixes, and adds the preparation water of viscous crude weight 10%～50% again, stirs, and makes the w/o type milk sap of phase water in containing;
(2) oil-water emulsifiers of its weight 1%～3% of adding in the preparation water after mixing, is prepared water as the foreign minister and is used;
The foreign minister of w/o type milk sap adding step (2) preparation that contains interior phase water that (3) step (1) is prepared prepares in the water, wherein the foreign minister of step (2) preparation prepare the weight of water be phase water in containing of step (1) preparation w/o type milk sap weight 50%～100%, stir and promptly obtain a kind of oil well with the active viscous crude blocking agent of W/O/W type.
5. a kind of preparation method who is suitable for oil well with the active viscous crude blocking agent of W/O/W type according to claim 4 is characterized in that in the described viscous crude, gum asphaltic content is not less than 30wt%.
6. a kind of preparation method who is suitable for oil well with the active viscous crude blocking agent of W/O/W type according to claim 4 is characterized in that described water-in-oil emulsifier is a nonionic surface active agent; Described oil-water emulsifiers is an ionogenic surfactant.
7. a kind of preparation method who is suitable for oil well with the active viscous crude blocking agent of W/O/W type according to claim 6, it is characterized in that described nonionic surface active agent is a kind of in sorbitan fatty acid ester, Span60, the polyoxyethylene nonylphenol ether-4.
8. a kind of preparation method who is suitable for oil well with the active viscous crude blocking agent of W/O/W type according to claim 6, it is characterized in that described ionogenic surfactant is a kind of in dodecyl sodium soap, sodium laurylsulfonate, Sodium dodecylbenzene sulfonate, petroleum sodium sulfonate, the dodecyl carboxylic acid sodium.
9. a kind of preparation method who is suitable for oil well with the active viscous crude blocking agent of W/O/W type according to claim 4, it is characterized in that, described configuration water is the water behind the calcium ions and magnesium ions in the complexing water, a kind of as in disodium ethylene diamine tetraacetate, quadrol hydroxyethyl nitrilotriacetic, the diethylenetriamine pentaacetic acid of the complexing agent that uses.
10. the active viscous crude blocking agent of W/O/W type as claimed in claim 1 is stopped up well water in oil field, land or marine oil field application.
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