CN1548700A - Plugging technology of high infiltration layer - Google Patents

Abstract

The blocking-off process for high water seepage layer includes injecting dispersion fluid-I into stratum, injecting dispersion fluid-II, keeping well in close state for 5-7 days and injecting steam chemically. The dispersion fluid-I is compounded with waste well drilling polymer sludge and lignosulfonate in 0.1-5 wt% as sludge diluent. The dispersion fluid-II is compounded with waste oil field sludge in 30-50 wt%, waste water in 49-69 wt% and OP-type surfactant as dispersant in 0.3-1 wt%. The present invention can block active side and bottom water in oil deposit area effectively in monoway without blocking hot exploitation steam injecting channel. The present invention has relatively low cost, and is suitable for exploit dense oil thermally.

Description

The plugging technology of high permeable layer

Technical field

The present invention proposes to protect is a kind of plugging technology of brand-new high permeable layer, and it is mainly used in the shutoff of water at the bottom of the limit that the super heavy oil block in oil oil field enlivens.

Background technology

Heavy crude reservoir generally all has relatively more active Bian Dishui, and after carrying out thermal recovery, along with the continuous decline of formation pressure, Bian Dishui will constantly invade, and floods effective development layer position.This just causes a large amount of well waters, and oil well is not had by water logging too early.The moisture content of oil well rises, and causes capacity of oilwell to descend, and makes the production decline aggravation.Fast main cause that the oil well water breakthrough is fast, moisture content rises is that formation pressure descends soon in the thermal recovery enhanced oil recovery process, and pressure reduction is big, and corresponding aquifer pressure height, and this just causes water intrusion at the bottom of the limit, or has destroyed the sealing of part tomography water proof.The intrusion of water at the bottom of the limit has not only reduced recovery ratio, has also reduced the periodicity of handling up simultaneously.This class being had the heavy crude reservoir that enlivens water at the bottom of the limit, how to control the interference of water layer effectively, is to improve recovery ratio, a very important problem that extends manufacture cycle.

In the past in the exploitation of viscous crude and special viscous crude, it is very limited to tackle at the bottom of the limit method of water, for example, simply that pump is big by changing for a short time, production fluid amount and oil production are all increased thereupon, this yes very passive and a have no way out method, inconsiderable basically method.Or take limit portion to beat catch pit, and to strengthen the method for draining, but, contain water area often much larger than oil area for viscous crude and special heavy crude reservoir, the water body volume is much larger than the oil body volume, and the effect of this so-called reinforcement draining is very limited.In addition, also can adopt ultra-fine oil well cement to come shutoff crack and high permeable layer.Though but this method can shutoff limit Di Shui, also shutoff thermal recovery annotate the passage of vapour, do not reach the purpose of recovering production capacity.In addition, the expensive and high price of ultra-fine oil well cement usually makes prestige and steps back.In addition, also have and adopt gel-like chemical water shutoff agent, but it often part enter non-purpose oil-producing formation, it is come to harm.

Summary of the invention

The purpose of this invention is to provide a kind of plugging technology of brand-new high permeable layer, make plugged zone have one-way preferably, the passage of vapour is annotated in not shutoff thermal recovery, and can effectively stop passing through of water at the bottom of the limit, and cost is lower simultaneously.

The object of the present invention is achieved like this: this plugging technology is characterised in that for the less oil well of seepage and adopts two kinds of plugging materials, be dispersing fluid-1 and dispersing fluid-2, at first in the interlayer slit, inject by discarded drilling well with polymer mud and the lignosulfonates that account for polymer mud weight 0.1%-5% as slurry thinner formulated dispersing fluid-1, and then the injection greasy dirt of oilfield waste, sewage and OP type surfactant are as dispersing agent formulated dispersing fluid-2, three kinds of compositions respectively account for the 30-50% of gross weight in the dispersing fluid-2,49-69% and 0.3-1%, make high seepage flow change low seepage flow into, and then stop seepage.

For the bigger oil well of seepage, can between above-mentioned two kinds of plugging materials, add one deck cage construction, cage construction adopts beta fibers insulating liquid and resin sand to make.The beta fibers insulating liquid is to add the beta fibers that accounts for water weight 0.1%-2% in water, high-speed stirred forms, and the selection of resin sand will be complementary with the crack and the pore size of shutoff, the effect of cage construction is to make duct stream become seepage flow, make the plugging action of plugging material fully play effect, obtain better plugging effect.

And, then can also in cage construction, increase the one layer of polymeric cement paste for the oil well of the bigger seepage that forms with duct stream, so that skeleton is firmer, plugging effect is better.

Adopt the formed plugged zone of plugging technology of the present invention to have one-way and sealing characteristics preferably, can effectively stop passing through of water at the bottom of the limit.The waste discharge thing that waste mud and waste sludge are in the field produces to be produced; often need to consume lot of manpower and material resources in order to seek rational home to return to them; and the present invention utilizes it as plugging material it to be returned the stratum again; not only can save great amount of manpower and material resources, have the effect of environmental protection simultaneously.

The present invention adopts beta and resin sand to make cage construction, wherein beta is a kind of silicate that is rich in magnesium, the about 1 μ m of its radius, its distribution of lengths wide range, several approximately μ m even to 10 several centimetres, flexibility and intensity are splendid, estimable is, and its heatproof can reach 1280 ℃, this just is particularly suitable for the use under the high-temperature steam condition, it matches with the resin sand that particle diameter and duct size are complementary, set up the cage construction of heat resisting and pressure resisting, this has just guaranteed the intensity and the effect of shutoff.Re-use the clay polymer cement of getting of conventional oil well water and strengthen cage construction, then can make the intensity of cage construction higher.In addition because the plugging material that the present invention adopts to annotating half handling capacity that entered of vapour, causes the destruction to the shutoff skeleton so can prevent steam injection pressure greater than the stress intensity of shutoff skeleton.

Description of drawings

Fig. 1 to Fig. 3 is the work physical model schematic diagram of three kinds of embodiment of the present invention.

The specific embodiment

Below the present invention will be further described in detail by the specific embodiment.

As seen from the figure, embodiment one shown in Figure 1 comprises the plugged zone of being made up of two kinds of plugging materials, wherein A is by discarded drilling well polymer mud and adds 0.1% lignosulfonates as slurry thinner formulated dispersing fluid-1, B is that the OP type surfactant of the greasy dirt that accounts for the oilfield waste of gross weight about 39%, 60% sewage and 1% is as dispersing agent formulated dispersing fluid-2, two kinds of plugging materials inject successively, after construction is finished, vexed well 5-7 days, can enter steam chemistry injection technology, 1 is the ground edge water among the figure.

Account for the lignosulfonates of polymer mud weight 3% as slurry thinner formulated dispersing fluid-1 except that including A by discarded drilling well polymer mud and adding by embodiment shown in Figure 2 two, B is the greasy dirt that accounts for the oilfield waste of gross weight about 30%, 69% sewage and 1% OP type surfactant are as dispersing agent formulated dispersing fluid-2, in addition, between two-layer plugging material, also be marked with cage construction, cage construction is made up of beta fibers insulating liquid C and resin sand D, the beta fibers insulating liquid is to add the beta fibers that accounts for water weight 0.1% in water, and high-speed stirred forms.Resin sand is 0.1cm according to the selection of dimension diameter in slit, the order that present embodiment injects is followed successively by: dispersing fluid-1, beta fibers insulating liquid, resin sand, beta fibers insulating liquid, dispersing fluid-2, injected vexed well 5-6 days later on, and can enter steam chemistry injection technology.

Embodiment three as shown in Figure 3, plugging material in including the foregoing description reaches the cage construction that is made of beta fibers insulating liquid C and resin sand D, in cage construction, also include polymer water mud E, wherein the lignosulfonates in the dispersing fluid-1 are to account for 5% of polymer mud weight, oilfield waste greasy dirt in the dispersing fluid-2 accounts for 50% of gross weight, sewage accounts for 49.7%, OP type surfactant comprise 0.3%, beta fibers in the beta fibers insulating liquid in the cage construction accounts for 2% of water weight, because hole is bigger, it is 0.3cm that resin sand is chosen diameter, polymer water mud is to choose 90 C oil well cement pastes and the synthetic rubber latex preparation that meets the API standard, if the addition of synthetic rubber latex is greater than 10%, can obtain better effect, but cost is higher, take all factors into consideration, the present embodiment addition is 10%, and stirring gets final product.The order that present embodiment injects is followed successively by: dispersing fluid-1, beta fibers insulating liquid, resin sand, polymer water mud, beta fibers insulating liquid, dispersing fluid-2, injected vexed well 5-6 days later on, and can enter steam chemistry injection technology.

The consumption of various plugging materials and framework material is the average thickness Δ h according to water layer among the present invention _w(m) and average blocking radius R _Av(m) calculate respectively, in general, can be according to handle up injection and input output model and the shutoff logistics parameter after the shutoff, Δ P falls in the dynamic oil lamination _d, its concrete design formulas of component that obtains each plugging material and framework material is as follows:

$V_{\mathrm{Tot}}\≈f\underset{i}{\mathrm{\Σ}}\left(\frac{\mathrm{\Δ}{h}_i}{2}\right){\mathrm{\φ}}_i\mathrm{\π}{R}_{\mathrm{Av}}^2$

F is the empirical parameter of plugging material and framework material total amount in the formula, is 1-5, is estimated that get big value more greatly as the water yield, the water yield is less to get the small value according to the degree and the construction cycle of water at the bottom of the limit.φ is the degree of porosity of each layer position.

Be the design example of the plugging material component in embodiment three, determined below, see the following form according to above-mentioned formula:

Sequence number	Material	???φ	?Δh/2	??ΔP d	???R Av	????V(m 3)
							???1	Dispersing fluid-1	??0.17	???1.5	???8.0	???21.7	????198
???2	The beta insulating liquid	??0.17	???1.5	???8.1	???14.9	?????10.
							???3	Resin sand	??0.15	???1.5	???8.5	???14.5	???20(0.6)
???4	Polymer cement	??0.12	???1.8	???8.6	???13.9	?????20
							???5	The beta insulating liquid	??0.12	???2.2	???8.7	???12.8	?????10
???6	Dispersing fluid-2	??0.12	???3.5	??10.0	???12.3	?????200
							Amount to	The shutoff logistics			??10.0	???21.7	???～460

Claims (3)

1, the plugging technology of high permeable layer, it is characterized in that its adopt following plugging material in the following order layering inject the stratum: 1. dispersing fluid-1 and 6. dispersing fluid-2 after construction is finished, vexed well 5-7 days, enter steam chemistry injection technology; Dispersing fluid-the 1st wherein, it is formulated as slurry thinner to select discarded drilling well polymer mud to add the lignosulfonates that account for polymer mud weight 0.1%-5%; Dispersing fluid-the 2nd selects greasy dirt, sewage and the OP type surfactant of oilfield waste formulated as dispersing agent, and three kinds of raw materials account for 30-50%, 49-69% and the 0.3-1% of gross weight respectively.

2, according to the said technology of claim 1, it is characterized in that between 1. dispersing fluid-1 and 6. dispersing fluid-2, also being injected with 2. beta fibers insulating liquids, 3. resin sand and 5. beta fibers insulating liquids, wherein the beta fibers insulating liquid is to add the beta fibers that accounts for water weight 0.1-2% in water, high-speed stirred forms, and injection is followed successively by 1. dispersing fluid-1,2. beta fibers insulating liquid, 3. resin sand, 5. beta fibers insulating liquid and 6. dispersing fluid-2 in proper order.

3, according to the said technology of claim 2, it is characterized in that between 3. resin sands and 5. beta fibers insulating liquids, being injected with 4. polymer water mud, polymer cement is to choose the 90 C oil well cements that meet the API standard to prepare, add the synthetic rubber latex of by mass of cement 10-25%, stirring gets final product.

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