CN105952420A - A sand prevention method for oil and gas wells - Google Patents
A sand prevention method for oil and gas wells Download PDFInfo
- Publication number
- CN105952420A CN105952420A CN201610363580.XA CN201610363580A CN105952420A CN 105952420 A CN105952420 A CN 105952420A CN 201610363580 A CN201610363580 A CN 201610363580A CN 105952420 A CN105952420 A CN 105952420A
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- China
- Prior art keywords
- oil
- fluid
- sand
- load fluid
- gas well
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/04—Gravelling of wells
Abstract
The invention provides a sand prevention method for oil and gas wells. The method comprises the steps of mixing first sand-carrying fluid with a density of 1.2-2.3g/cm<3> and a filling material to obtain first sand mixed fluid; injecting the first sand mixed fluid and reservoir-compatible fluid in an oil and gas well, and controlling the filling pressure in an oil reservoir to be 5-25 MPa and the ground filling pressure to be 1-8 MPa in the injection process; stopping pumping the first sand mixed fluid when the ground filling pressure reaches limit pressure, and continuing to inject reservoir-compatible fluid to dilute the first sand-carrying fluid in the well; washing the well to finish the sand prevention operation of the oil and gas well. The method can fulfill the sand prevention work for oil and gas wells without a fracturing pump vehicle; the operation is simple and the cost is low.
Description
Technical field
The present invention relates to the anti-sand method of a kind of Oil/gas Well, belong to Oil/gas Well sand control technique field.
Background technology
In technical field of petroleum extraction, particularly when loose oil-gas reservoir is exploited, due to general in recovery process
Store-through, in phenomenon of shaking out, has had a strong impact on the normal production of Oil/gas Well, and taking sand control measure has been to solve sand production of oil-gas wells
Main path.
The sand control measure being currently mainly used is high pressure gravel filling sand prevention and artificial borehole wall sand prevention both sand-preventing process.
Both sand control measures mainly rely on the high-pressure plunger pump of pressure break pump truck (to be made in tradition sand-preventing process by mulling liquid
Load fluid prepared by reservoir compatibility fluid and viscosifier and obtain, its density is 1.0-1.1g/cm3) after pressurization
Pumping into well head, but the production technology of pressure break pump truck is by abroad grasping, its core component is all abroad monopolized, and price is high
High, use its sand control treatment cost the highest.
In view of pressure break pump truck decisive role played in sand control treatment, the quality of its equipment will directly affect construction
Effect, in operation process once fracturing unit truck break down will cause construction failure.In addition, fracturing unit truck due to
Floor space is big, can be restricted when carrying out offshore platform operation.
Additionally, tradition sand-preventing process requires ground stuffing pressure higher (generally 10-30MPa), the safety of construction
Can need to pay attention to.
Therefore it provides one can not rely on fracturing unit truck, it is urgently to be resolved hurrily that simple and effective sand-preventing process becomes this area
Technical problem.
Summary of the invention
For solving above-mentioned technical problem, it is an object of the invention to provide a kind of anti-sand method for Oil/gas Well, the party
Method is without relying on pressure break pump truck can realize the sand control treatment to Oil/gas Well, simple to operate, with low cost.
For reaching above-mentioned purpose, the invention provides a kind of anti-sand method for Oil/gas Well, it comprises the following steps:
Step one: be 1.2-2.3g/cm by density3The first load fluid mix with packing material, obtain the first mulling liquid；
Step 2: inject the first mulling liquid and reservoir compatibility fluid in Oil/gas Well, regulate the first mulling in injection process
The injection ratio of liquid and reservoir compatibility fluid is with the stuffing pressure in control oil reservoir as 5-25MPa, and ground stuffing pressure is
1-8MPa；
Step 3: when ground stuffing pressure reaches threshold pressure, stops pumping into the first mulling liquid, continues to inject reservoir
The first load fluid in well is diluted by compatibility fluid；Wherein, 8MPa < described threshold pressure≤10MPa；
Step 4: well-flushing, completes the sand control treatment of Oil/gas Well.
The density domination of load fluid is 1.2-2.3g/cm by the technical scheme that the present invention provides3, enable load fluid certainly
Heavy sensation of the body power under effect automatically toward seepage flow in stratum, and by the stuffing pressure in control oil reservoir and ground stuffing pressure
Enable load fluid successfully to carry packing material and enter the annular space of formation depletion band or screen casing and sleeve pipe, it is not necessary to borrow
The pressure break pump truck helping costliness can realize the sand control treatment of Oil/gas Well.
In above-mentioned steps one, it is 1.2-2.3g/cm by the density domination of load fluid3, this density conditions can make load fluid
There is higher head of liquid, enable packing material to pass through perforation holes, and heap overstocks in formation depletion band
Real.
In above-mentioned steps two, while injecting the first mulling liquid in Oil/gas Well, in Oil/gas Well, inject reservoir compatibility
Fluid, it can regulate the density of the first load fluid, thus change the head of liquid of the first load fluid, in making Oil/gas Well
Stuffing pressure in oil reservoir remains 5-25MPa, and the stuffing pressure controlled in oil reservoir can make in the range of this
Packing material passes through borehole, and enters compacting in formation depletion band, forms sand barrier.
In the technical scheme that the present invention provides, the liquid of stuffing pressure=the first load fluid in oil reservoir in described Oil/gas Well
Column pressure+ground stuffing pressure.
In the above-mentioned methods, it is preferable that in step one, the raw material composition of described first load fluid includes water and increases the weight of
Agent；Wherein, described heavy weight additive is inorganic salt and/or organic salt；It is highly preferred that described inorganic salt include sodium chloride,
The combination of one or more in potassium chloride, calcium chloride, sodium nitrate, sodium bromide, calcium bromide；Described organic salt includes
Sodium formate, potassium formate, cesium formate, potassium acetate, potassium citrate, Soluble tartar., ammonium acetate, ammonium citrate, winestone
The combination of one or more in acid ammonium.
The load fluid that the present invention provides is good with the compatibility of reservoir, strong inhibition capability, and due to described load fluid and filling
Density difference between material is less, and beneficially packing material suspends wherein, thus prop-carrying capacity is preferable；Wherein, originally
The heavy weight additive that invention provides can be effectively improved the density of load fluid during sand control treatment, increases the fluid column of load fluid
Pressure, thus increase the stuffing pressure in oil reservoir, reduce ground stuffing pressure；Meanwhile, the present invention is used to provide
Heavy weight additive be less likely to occur to cause filling failed phenomenon because fluid passage blocking during sand control treatment, and
Can effective reservoir protec-tion.
In the above-mentioned methods, it is preferable that in step 2, screw pump is used to inject the first mulling liquid in Oil/gas Well.
Screw pump has good sediment transport performance, can be according to hole condition by used in parallel for multiple screw pumps during use.Described screw pump
For existing apparatus.
Reservoir compatibility fluid of the present invention can be water, it is also possible to water-soluble for containing a small amount of oilfield chemical auxiliary
Liquid, the kind for concrete oilfield chemical auxiliary is not particularly limited.
In the above-mentioned methods, it is preferable that in step 2, described first mulling liquid and total injection of reservoir compatibility fluid
Amount is 0.5-2.5m3/min；Total injection rate of described first mulling liquid and reservoir compatibility fluid is described first mulling liquid
With the reservoir mixed injection rate of compatibility fluid.
In the above-mentioned methods, it is preferable that in step 3, stop pumping into the first mulling liquid, continue to inject reservoir compatibility
The first load fluid in well is diluted making packing material fully settle compacting by fluid, takes sand by first during dilution
The density of liquid is diluted to 1.0g/cm3Left and right.
In the above-mentioned methods, it is preferable that after step 3 terminates, before step 4 starts, the method also includes using
Oil/gas Well is managed the step of interior flow pack by two mulling liquid, and in described pipe, flow pack is the ordinary skill in the art
Means；Wherein, described second mulling liquid is mixed to get by the second load fluid and packing material.
In the above-mentioned methods, it is preferable that in step one, the sand of described first mulling liquid is than for 5-40%, and sand ratio is low
In this scope, back-up sand speed can be caused low, the engineering time is long, and operating cost increases；Sand ratio higher than this scope,
Then beyond the ability of ground pad device, and same can block in down-hole.
In the above-mentioned methods, it is preferable that described packing material includes one or more in gravel, haydite, resin sand
Combination.
In the above-mentioned methods, it is preferable that the method comprises the following steps:
Step one: reservoir compatibility fluid and heavy weight additive are mixed to get the first load fluid, the density of described first load fluid
For 1.2-2.3g/cm3；
Step 2: the first load fluid is pumped into fracturing blender truck by the first tank truck, after mixing with the packing material in fracturing blender truck,
Obtain sand than the first mulling liquid for 5-40%；
Step 3: utilize screw pump to be pumped in Oil/gas Well by the first mulling liquid by fracturing blender truck, utilizes cementing truck to store up simultaneously
Layer compatibility fluid pumps in Oil/gas Well, and the ratio that pumps into of the first mulling liquid and reservoir compatibility fluid that regulates is to control Oil/gas Well
Stuffing pressure in interior oil reservoir is 5-25MPa, and ground stuffing pressure is 1-8MPa；
Step 4: when ground construction pressure significantly increases, when reaching threshold pressure, stops pumping into the first mulling in well
Liquid, continues with in reservoir compatibility fluid is pumped into Oil/gas Well by cementing truck and is fully diluted, directly by the first load fluid in well
It is diluted to 1.0g/cm to its density3；Wherein, 8MPa < described threshold pressure≤10MPa；
Step 5: well-flushing, completes the sand control treatment of Oil/gas Well.
In the above-mentioned methods, the well-flushing described in step 5 is ordinary skill in the art means.
In the above-mentioned methods, it is preferable that after step 4 terminates, before step 5 starts, the method also includes second
Load fluid obtains the second mulling liquid with packing material after mixing, use described second mulling liquid to manage described Oil/gas Well
The step of interior flow pack；Described second load fluid can use conventional load fluid, it is highly preferred that the second load fluid
Consist of water and guanidine glue；Wherein, with the mass percent of the second load fluid, the content of described guanidine glue is 1-5%；
In described pipe, cyclic pac king is the common process of this area.
Sand ratio of the present invention refers to the ratio of sand feeding amount (heap volume) and the volume of load fluid used, with percent table
Show；Wherein, " sand " refers to packing material.
Beneficial effects of the present invention:
1) technical scheme that the present invention provides is without relying on pressure break pump truck can realize the sand control treatment of Oil/gas Well, significantly
Reduce construction cost；
2) depend on compared with the sand-preventing process of pressure break pump truck with tradition, the equipment that the technology that the present invention provides uses is simple,
Volume is little, it is simple at sea the limited ground of platform or other place operates；
2) compared with tradition sand-preventing process, ground stuffing pressure is required relatively low by the technical scheme that the present invention provides, and executes
Work is safer；
3) compatibility of the first load fluid and reservoir that the present invention provides is good, strong inhibition capability, be beneficial to reservoir protec-tion,
And this load fluid has the prop-carrying capacity of excellence, it is to avoid filling process is filled unsuccessfully because fluid passage blocking causes.
Accompanying drawing explanation
Fig. 1 is the structural representation of ground sand control filling device；
Main Reference label declaration:
1: the first tank truck；2: fracturing blender truck；3: screw pump；4: the second tank trucks；5: cementing truck.
Detailed description of the invention
In order to the technical characteristic of the present invention, purpose and beneficial effect are more clearly understood from, the existing skill to the present invention
Art scheme carries out described further below, but it is not intended that to the present invention can the restriction of practical range.
Ground sand control filling device used in embodiment is as shown in Figure 1.
This ground sand control filling device includes the first tank truck 1, fracturing blender truck 2, screw pump the 3, second tank truck 4, water
Mud car 5；Wherein,
The outfan of the first tank truck 1 is connected with the input of fracturing blender truck 2, the outfan of fracturing blender truck 2 and screw pump 3
Input be connected, the outfan of screw pump 3 is connected with the well head of Oil/gas Well；
The outfan of the second tank truck 4 is connected with the input of cementing truck 5, the outfan of cementing truck 5 and Oil/gas Well
Well head is connected.
Embodiment
Present embodiments providing the anti-sand method of a kind of Oil/gas Well, the method comprises the following steps:
1. the density of the first load fluid that the present embodiment uses is 1.5g/cm3, it is by water and potassium formate (heavy weight additive)
Composition, with the mass percent of the first load fluid, the content of formates is 70%；The preparation of the first load fluid
Journey specifically includes:
Under conditions of circulation stirring, adding potassium formate in water, circulation stirring is completely dissolved to potassium formate, obtains close
The first load fluid that degree is, then adds the first load fluid in the first tank truck 1；
2. the first load fluid is pumped into fracturing blender truck 2, fracturing blender truck 2 obtains sand with gravel mixed preparing than for 5-40%
The first mulling liquid；
3. utilize screw pump 3 that first mulling liquid pump is entered well head, utilize cementing truck 5 to inject water, note to well head simultaneously
The pressure of the injection ratio of the first mulling liquid and water of regulating during entering density and fluid column thereof to change the first load fluid,
Thus controlling the stuffing pressure in oil reservoir is 5-25MPa, ground stuffing pressure is 1-8MPa；Wherein,
The injection ratio of the first mulling liquid and water determines according to ground experiment, and the first mulling liquid and mixed injection of water are arranged
Amount is 1.0-2.5m3/min；
This stage gravel can enter stratum under the effect of high density load fluid (namely first load fluid) head of liquid
Band in debt, forms sand block barrier；
4. significantly increase when ground stuffing pressure, when reaching threshold pressure (8MPa < described threshold pressure≤10MPa),
Stop pumping into the first mulling liquid, continue to inject water, the first load fluid of down-hole is fully diluted to the density close to water
(1.0g/cm3), make gravel fully settle compacting；
5. in the first tank truck 1, add the second load fluid, the second load fluid consist of water and guanidine glue, with second
The mass percent of load fluid, the content of guanidine glue is 1-5%, obtains the second mulling liquid (with gravel after it being mixed
The sand of two mulling liquid is than for 5-15%) carry out managing interior flow pack；This step is mainly for being employing gravel filling before
The well of sand-preventing process operation, if being the well using artificial borehole wall sand prevention process operation before, then can not carry out this step
Rapid operation；
6. carrying out well-flushing, construction terminates.
The load fluid that above-described embodiment provides is good with the compatibility of reservoir, strong inhibition capability, and due to load fluid and filling
Density difference between material is less, and beneficially packing material suspends wherein, thus prop-carrying capacity is preferable；Wherein, add
Heavy prescription can be effectively improved the density of load fluid during sand control treatment, increases the head of liquid of load fluid, thus increases
Stuffing pressure in big oil reservoir, reduces ground stuffing pressure；Meanwhile, heavy weight additive is not allowed during sand control treatment
The blocking of Yi Fashengyin fluid passage and cause filling failed phenomenon, and can effective reservoir protec-tion.
For the present invention provide other heavy weight additive (such as: sodium chloride, potassium chloride, calcium chloride, sodium nitrate, bromination
Sodium, calcium bromide, sodium formate, cesium formate, potassium acetate, potassium citrate, Soluble tartar., ammonium acetate, ammonium citrate,
Ammonium tartrate) the first load fluid of preparing, the density controlling the first load fluid during preparation is 1.2-2.3g/cm3,
Then according to the step in above-described embodiment operates, it is obtained in that the sand controlling result identical with embodiment equally；This
The heavy weight additive that invention provides in use, can be used alone, it is also possible to multiple is used in mixed way, and does not has when being used in mixed way
Ratio requirement, need to be only 1.2-2.3g/cm by the density domination of the first final load fluid3?.
Comparative example
This comparative example provides the anti-sand method of a kind of Oil/gas Well, and the method comprises the following steps:
Reservoir compatibility liquid (predominantly water) is mixed join with viscosifier (viscosifier used are product commonly used in the art)
Preparing load fluid, the density of load fluid is 1.0-1.1g/cm3；
Mulling liquid (sand of mixed sand liquid than for 5-40%) is obtained with gravel after being mixed by load fluid；
The high-pressure plunger pump utilizing pressure break pump truck pumps into well head after directly being pressurizeed by mulling liquid, uses pressure break pump truck outside pipe
The stuffing pressure carrying out bearing on ground during filling is 10-30MPa.
Compared with comparative example, the present invention provide embodiment without using pressure break pump truck can realize the sand control of Oil/gas Well,
And effectively reduce in sand control process ground construction pressure (in comparative example, ground stuffing pressure is 10-30MPa,
And ground stuffing pressure is 1-8MPa in embodiment), construct safer.
Claims (10)
1., for an anti-sand method for Oil/gas Well, it comprises the following steps:
Step one: be 1.2-2.3g/cm by density3The first load fluid mix with packing material, obtain the first mulling liquid；
Step 2: inject the first mulling liquid and reservoir compatibility fluid in Oil/gas Well, controls in oil reservoir in injection process
Stuffing pressure is 5-25MPa, and ground stuffing pressure is 1-8MPa；
Step 3: when ground stuffing pressure reaches threshold pressure, stops pumping into the first mulling liquid, continues to inject reservoir
The first load fluid in well is diluted by compatibility fluid；Wherein, 8MPa < described threshold pressure≤10MPa；
Step 4: well-flushing, completes the sand control treatment of Oil/gas Well.
Method the most according to claim 1, it is characterised in that in step one, described first load fluid
Raw material composition includes water and heavy weight additive；Wherein, described heavy weight additive is inorganic salt and/or organic salt；
Preferably, during described inorganic salt includes sodium chloride, potassium chloride, calcium chloride, sodium nitrate, sodium bromide, calcium bromide
The combination of one or more；Described organic salt include sodium formate, potassium formate, cesium formate, potassium acetate, potassium citrate,
The combination of one or more in Soluble tartar., ammonium acetate, ammonium citrate, ammonium tartrate.
Method the most according to claim 1 and 2, it is characterised in that in step 2, use screw pump to
The first mulling liquid is injected in Oil/gas Well.
4. according to the method described in any one of claim 1-3, it is characterised in that in step 2 and step 3,
Described reservoir compatibility fluid is water or the aqueous solution containing oilfield chemical auxiliary.
Method the most according to claim 1 and 2, it is characterised in that in step 2, described first mulling
Total injection rate of liquid and reservoir compatibility fluid is 0.5-2.5m3/min。
Method the most according to claim 1, it is characterised in that in step 3, mixes when stopping pumps into first
Sand liquid, when the first load fluid in well is diluted by continuation injection reservoir compatibility fluid, by dilute for described first load fluid
Release to density be 1.0g/cm3。
Method the most according to claim 1, it is characterised in that after step 3 terminates, before step 4 starts,
The method also includes the step using the second mulling liquid that Oil/gas Well is managed interior flow pack；Wherein, described second mix
Sand liquid is mixed to get by the second load fluid and packing material.
Method the most according to claim 1, it is characterised in that in step one, described first mulling liquid
Sand is than for 5-40%.
9. according to the method described in claim 1 or 7, it is characterised in that described packing material includes gravel, pottery
The combination of one or more in grain, resin sand.
Method the most according to claim 1, it is characterised in that the method comprises the following steps:
Step one: reservoir compatibility fluid and heavy weight additive are mixed to get the first load fluid, the density of described first load fluid
For 1.2-2.3g/cm3；
Step 2: the first load fluid is pumped into fracturing blender truck by the first tank truck, after mixing with the packing material in fracturing blender truck,
Obtain sand than the first mulling liquid for 5-40%；
Step 3: utilize screw pump to be pumped in Oil/gas Well by the first mulling liquid by fracturing blender truck, utilizes cementing truck to store up simultaneously
Layer compatibility fluid pumps in Oil/gas Well, and in control Oil/gas Well, the stuffing pressure in oil reservoir is 5-25MPa, and pressure is filled on ground
Power is 1-8MPa；
Step 4: when ground construction pressure reaches threshold pressure, stops pumping into the first mulling liquid in well, continues profit
The first load fluid in well is fully diluted, until its density is in reservoir compatibility fluid being pumped into Oil/gas Well with cementing truck
1.0g/cm3；Wherein, 8MPa < described threshold pressure≤10MPa；
Step 5: well-flushing, completes the sand control treatment of Oil/gas Well；
Preferably, after step 4 terminates, before step 5 starts, the method also includes the second load fluid and filling material
Obtain the second mulling liquid after material mixing, use described second mulling liquid that described Oil/gas Well is managed the step of interior flow pack
Suddenly；
It is highly preferred that described second load fluid consist of water and guanidine glue；Wherein, with the percent mass of the second load fluid
Than meter, the content of described guanidine glue is 1-5%；
It is further preferred that the sand of described second mulling liquid is than for 5-15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610363580.XA CN105952420A (en) | 2016-05-27 | 2016-05-27 | A sand prevention method for oil and gas wells |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610363580.XA CN105952420A (en) | 2016-05-27 | 2016-05-27 | A sand prevention method for oil and gas wells |
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| CN105952420A true CN105952420A (en) | 2016-09-21 |
Family
ID=56909897
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| CN201610363580.XA Pending CN105952420A (en) | 2016-05-27 | 2016-05-27 | A sand prevention method for oil and gas wells |
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Cited By (3)
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| CN114109315A (en) * | 2021-12-02 | 2022-03-01 | 中国地质大学（武汉） | Oil exploitation method for improving injection and exploitation capacity of reservoir |
| CN114774101A (en) * | 2022-04-12 | 2022-07-22 | 中海石油(中国)有限公司 | Solid-phase-free high-density gravel packing sand-carrying fluid and preparation method thereof |
| CN115434682A (en) * | 2021-06-04 | 2022-12-06 | 中国石油天然气股份有限公司 | Invariable sand carrying liquid and sand proportioning device for fracturing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115434682A (en) * | 2021-06-04 | 2022-12-06 | 中国石油天然气股份有限公司 | Invariable sand carrying liquid and sand proportioning device for fracturing |
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| CN114774101A (en) * | 2022-04-12 | 2022-07-22 | 中海石油(中国)有限公司 | Solid-phase-free high-density gravel packing sand-carrying fluid and preparation method thereof |
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Application publication date: 20160921 |