CN111188605B - Method for improving permeability of reservoir - Google Patents
Method for improving permeability of reservoir Download PDFInfo
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- CN111188605B CN111188605B CN201911302602.1A CN201911302602A CN111188605B CN 111188605 B CN111188605 B CN 111188605B CN 201911302602 A CN201911302602 A CN 201911302602A CN 111188605 B CN111188605 B CN 111188605B
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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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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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
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
Abstract
The disclosure provides a method for improving reservoir permeability, and belongs to the field of oilfield development. The method comprises the following steps: and selecting a carbonate rock reservoir as a target modification layer in the sedimentary rock oil and gas reservoir. The method comprises the steps of preparing a starch solution by utilizing the characteristic that the main component of the carbonate rock is carbonate, injecting the starch solution into a carbonate rock reservoir through an injection well, hydrolyzing the starch solution in the reservoir to form glucose, carrying out alcoholization, hydroformylation and acidification on the glucose to form acetic acid, reacting the acetic acid with the carbonate rock in the reservoir to generate water-soluble acetate, and consuming the water-soluble acetate, so that the porosity of the reservoir is improved, the connectivity of the reservoir is enhanced, and the permeability of the carbonate rock reservoir is improved.
Description
Technical Field
The disclosure belongs to the field of oilfield development, and particularly relates to a method for improving reservoir permeability.
Background
In the development of oil fields, it is generally necessary to modify the reservoir to increase the permeability of the reservoir and thus the production of the oil well.
In the related art of reservoir modification, reservoir acidizing techniques are generally employed to increase the permeability of a reservoir. Specifically, a certain amount of acid chemical agents such as organic acid or inorganic acid and the like are injected into the reservoir through an injection well, and the acid chemical agents react with carbonate in the reservoir to erode away a certain amount of carbonate, so that the porosity of the reservoir is increased, the pore connectivity is enhanced, and the permeability of the reservoir can be further improved.
However, because acid chemicals are corrosive, they can cause some corrosion to the well and downhole equipment during injection into the reservoir.
Disclosure of Invention
The embodiment of the disclosure provides a method for improving the permeability of a reservoir, the permeability of a carbonate reservoir can be improved by using a starch solution, and corrosion to underground equipment is avoided. The technical scheme is as follows:
in a first aspect, embodiments of the present disclosure provide a method for increasing reservoir permeability, the method including:
selecting a carbonate rock reservoir as a target modification layer in a sedimentary rock oil and gas reservoir;
and injecting a starch solution into the carbonate reservoir, wherein the starch solution forms glucose after being hydrolyzed in the carbonate reservoir, the glucose forms acetic acid after being alcoholized, hydroformylated and acidified, and the acetic acid reacts with carbonate in the carbonate reservoir to generate water-soluble substances which are consumed, so that the porosity of the carbonate reservoir is improved, and the permeability of the carbonate reservoir is improved.
Optionally, selecting the carbonate reservoir as a target modified zone comprises:
selecting the carbonate reservoir with the carbonate content of more than 30% as the target modified layer.
Optionally, the method further comprises:
collecting drill cuttings carried in the slurry when the carbonate reservoir is drilled;
fully reacting the drill cuttings with hydrochloric acid, and measuring the generation amount of carbon dioxide in the reaction;
and calculating the content of the carbonate in the carbonate reservoir according to the generation amount of the carbon dioxide.
Optionally, the method further comprises:
the amount of starch solution injected was calculated according to the following formula:
V＝π(r+10)2*d*Φ*k；
wherein V is the injection amount of the starch solution, r is the radius of an injection well, d is the thickness of the target modification layer, phi is the porosity of the target modification layer, k is a constant, and k is more than or equal to 20% and less than or equal to 30%;
and preparing the starch solution according to the calculated injection amount.
Optionally, the starch in the starch solution is cooked starch.
Optionally, the starch in the starch solution comprises at least one of corn, wheat, or potato.
Optionally, the solvent in the starch solution is reservoir water, or the composition of the solvent in the starch solution is the same as the composition of the reservoir water.
Optionally, the concentration of the starch solution is 0.2% -3%.
Optionally, the injecting a starch solution into the carbonate reservoir comprises:
injecting a starch solution into the carbonate reservoir through an injection well, the injection well comprising at least one of a production well or a water injection well.
In a second aspect, embodiments of the present disclosure provide a method of increasing reservoir permeability, the method comprising:
selecting a carbonate rock reservoir as a target modification layer in a sedimentary rock oil and gas reservoir;
and injecting a glucose solution into the carbonate reservoir, wherein the glucose in the glucose solution forms acetic acid after alcoholization, hydroformylation and acidification, and the acetic acid reacts with carbonate in the carbonate reservoir to generate water-soluble substances which are consumed, so that the porosity of the carbonate reservoir is improved, and the permeability of the carbonate reservoir is improved.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
the embodiment of the disclosure injects a certain amount of starch solution into the carbonate reservoir, and the starch solution is not corrosive, so that the corrosion to oil wells and underground equipment is avoided. The starch solution entering the carbonate reservoir is hydrolyzed in the carbonate reservoir to form glucose, the glucose is then alcoholized to form ethanol, the ethanol is hydroformylated to form acetaldehyde, the acetaldehyde is acidified to form acetic acid, the formed acetic acid finally reacts with carbonate in the carbonate reservoir, and water-soluble substances are generated and consumed, namely a certain amount of carbonate is eroded through the acetic acid, so that the porosity of the carbonate reservoir is improved, the connectivity of the carbonate reservoir is enhanced, and the permeability of the carbonate reservoir is further improved. That is to say, according to the method for improving the permeability of the carbonate reservoir provided by the disclosure, the starch solution is injected into the carbonate reservoir, the starch forms acetic acid after being alcoholized, hydroformylated and acidified, and the acetic acid can erode and directly consume the carbonate in the carbonate reservoir, so that the acid chemical agent of the corrosion-prone equipment is prevented from being directly added into the injection well, and the corrosion of the underground equipment is also prevented on the basis of improving the permeability of the carbonate reservoir.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method of enhancing reservoir permeability provided by an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a reservoir prior to reaction of starch provided by embodiments of the present disclosure;
FIG. 3 is a schematic diagram of the structure of a reservoir in a starch reaction provided by an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a reservoir after starch reaction provided by embodiments of the present disclosure;
FIG. 5 is a flow chart of a method of increasing reservoir permeability provided by an embodiment of the present disclosure;
fig. 6 is a flow chart of another method for enhancing reservoir permeability provided by an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
1. a starch solution; 2. an injection well; 3. a carbonate reservoir; 4. a carbonate salt; 5. a pore; 6. a water-soluble substance.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
Fig. 1 is a flow chart of a method for improving reservoir permeability according to an embodiment of the present disclosure, as shown in fig. 1, the method includes:
s101, selecting a carbonate reservoir as a target modification layer in the sedimentary rock oil and gas reservoir.
S102, injecting a starch solution into the carbonate reservoir, wherein the starch solution forms glucose after being hydrolyzed in the carbonate reservoir, the glucose forms acetic acid after being alcoholized, hydroformylated and acidified, and the acetic acid reacts with carbonate in the carbonate reservoir to generate water-soluble substances which are consumed, so that the porosity of the carbonate reservoir is improved, and the permeability of the carbonate reservoir is improved.
The principle of the method for improving the permeability of the reservoir is described below by combining a schematic diagram:
fig. 2 is a schematic structural diagram of a reservoir before starch reaction according to an embodiment of the present disclosure, and referring to fig. 2, a certain amount of starch solution 1 is injected into a carbonate reservoir 3, and the starch solution 1 is not corrosive, so that corrosion to oil wells and downhole equipment is avoided.
Fig. 3 is a schematic structural diagram of a reservoir in starch reaction provided by an embodiment of the present disclosure, referring to fig. 3, a starch solution entering a carbonate reservoir 3 is hydrolyzed in the carbonate reservoir 3 to form glucose, and a reaction formula is: (C)6H10O5)n+nH2O＝nC6H12O6. Because the carbonate reservoir 3 is an anaerobic environment, glucose is decomposed into ethanol in the anaerobic environment, and the reaction formula is as follows: c6H12O6＝2C2H5OH+2CO2. Dehydrogenation and oxidation of ethanol into acetaldehyde are carried out according to the following reaction formula: CH (CH)3CH2OH→CH3CHO + H. Dehydrogenation and oxidation of acetaldehyde into acetic acid, the reaction formula is: CH (CH)3CHO→CH3COOH + H, the acetic acid formed eventually reacts with carbonate 4 (e.g. calcium carbonate) in the carbonate reservoir. During the reaction, the carbonate 4 is consumed and a water-soluble substance 6, such as calcium acetate, is produced.
Fig. 4 is a schematic structural diagram of the reservoir after starch reaction according to the embodiment of the present disclosure, referring to fig. 4, as the reaction proceeds, the carbonate 4 in the reaction region is gradually consumed and the water-soluble substance 6 is generated, and the water-soluble substance 6 is finally dissolved in the formation water, so that the porosity 5 of the carbonate reservoir 3 is increased, i.e., the porosity is increased, and the connectivity of the carbonate reservoir 3 is enhanced, thereby increasing the permeability of the carbonate reservoir 3.
That is to say, according to the method for improving the permeability of the carbonate reservoir provided by the present disclosure, the starch solution 1 is injected into the carbonate reservoir 3, the starch solution 1 is hydrolyzed and then subjected to alcoholization, hydroformylation and acidification to form acetic acid, the acetic acid reacts with the carbonate 4 in the carbonate reservoir 3 to generate the water-soluble substance 6, and the water-soluble substance 6 is directly consumed, so that the acid chemical agent of the corrosion-prone equipment is prevented from being directly added into the injection well 2, and the corrosion of the underground equipment is also avoided on the basis of improving the permeability of the carbonate reservoir.
It should be noted that the carbonate reservoir 3 may be a mudstone reservoir and a sandstone reservoir, which is not limited by the present disclosure.
Fig. 5 is a flow chart of a method for improving reservoir permeability provided by an embodiment of the present disclosure, as shown in fig. 5, the method including:
s501, selecting a carbonate reservoir as a target modification layer in the sedimentary rock oil and gas reservoir.
Optionally, a carbonate reservoir with a carbonate content of more than 30% is selected as the target modified zone.
In the implementation, the carbonate reservoir with the carbonate content of more than 30% is selected as the target modification layer, so that the acetic acid can fully react with and consume the carbonate reservoir in the subsequent steps, the porosity of the carbonate reservoir is obviously improved, and the permeability is improved.
It is easily understood that when the carbonate content in the carbonate reservoir is low, the acetic acid generated in the subsequent step cannot sufficiently react with and consume the carbonate reservoir, so that the porosity of the carbonate reservoir is not obviously improved, and the effect of improving the permeability is not achieved.
Optionally, the carbonate content of the carbonate reservoir is obtained by:
a. and collecting drill cuttings carried in the slurry when the carbonate reservoir is drilled.
b. The drill cuttings were thoroughly reacted with hydrochloric acid and the amount of carbon dioxide produced during the reaction was measured.
c. And calculating the content of the carbonate in the carbonate reservoir according to the generation amount of the carbon dioxide.
In the embodiment, the content of carbonate in the carbonate reservoir can be conveniently measured through drill cuttings carried by mud during drilling, so that the target modified layer can be quickly determined.
And S502, calculating the injection amount of the starch solution.
Step S502 may be implemented by:
the injection amount of the solution is calculated by the following formula:
V＝π(r+10)2*d*Φ*k； (1)
wherein V is the injection amount of the starch solution, r is the radius of an injection well, d is the thickness of a carbonate reservoir and phi is the porosity of the carbonate reservoir, k is a constant, and k is more than or equal to 20% and less than or equal to 30%.
The injection well is a well for injecting the starch solution.
Illustratively, the injection amount of the starch solution is related to the radius of the injection well, the thickness of the carbonate reservoir and the porosity of the carbonate reservoir, so that the relevant characteristic parameters of the injection well and the carbonate reservoir need to be measured before the starch solution is injected, thereby ensuring that the proper amount of starch solution is added and avoiding waste of raw materials.
S503, preparing the starch solution according to the calculated injection amount.
In the embodiment, the starch solution is prepared according to the calculated injection amount, so that not only can the cost be controlled, but also the injected starch solution can be ensured to be enough to dissolve the carbonate reservoir meeting the requirement, and the permeability of the carbonate reservoir area is obviously improved.
Optionally, the starch in the starch solution is cooked starch.
In the above embodiments, the starch is modified by cooking to facilitate faster reaction rates in subsequent steps to promote hydrolysis to glucose.
It is well understood that the starch in the cooked starch solution is uniformly dispersed and the surface area of the starch is increased, which facilitates the hydrolysis of the starch to glucose in carbonate reservoirs.
Optionally, the starch in the starch solution comprises at least one of corn, wheat, or potato.
In the above embodiments, the starch solution may be formulated by corn, wheat or potato, which have a high starch content and are inexpensive, thereby reducing costs.
Optionally, the solvent in the starch solution is reservoir water, or the composition of the solvent in the starch solution is the same as the composition of the reservoir water.
In the above embodiment, the solvent in the starch solution is reservoir water, or the component of the solvent in the starch solution is the same as that of the reservoir water, so that reservoir water sensitivity caused by mismatching of the water of the solvent and the reservoir water is avoided, and diffusion of the starch solution in the reservoir water, namely diffusion in the carbonate reservoir is facilitated, and the starch solution is in full contact with the carbonate reservoir to improve the overall permeability of the carbonate reservoir.
It should be noted that the composition of the solvent in the starch solution may also be similar to the composition of the reservoir water, which may reduce the difficulty of preparing the starch solution.
Alternatively, the concentration of the starch solution may be 0.2% to 3%.
In the above embodiment, the concentration of the starch solution is 0.2% to 3%, which facilitates the hydrolysis of starch, and avoids the problem that the starch is poor in dispersibility when the concentration of the starch solution is high, thereby affecting the hydrolysis of starch.
And S504, adding yeast into the starch solution.
In the above embodiment, the addition of yeast to the starch solution facilitates the rapid breakdown of glucose to ethanol.
The anaerobic organism of the microzyme has low oxygen content in the carbonate rock reservoir, and after the starch is hydrolyzed to form glucose, the microzyme can accelerate the glucose to be decomposed into ethanol and carbon dioxide, thereby improving the rate of forming acetic acid by the starch.
And S505, injecting a starch solution into the carbonate reservoir.
Optionally, the starch solution is injected into the carbonate reservoir through an injection well. The entry of starch into carbonate reservoirs is facilitated by injecting a starch solution into the injection well.
Illustratively, the injection well comprises at least one of a production well or a water injection well.
In the embodiment, for the oil production well, the porosity of the carbonate reservoir can be increased by injecting the starch solution into the carbonate reservoir, so that the yield of the oil well is improved, and the aim of improving the oil production speed is fulfilled; for the water injection well, the porosity of the carbonate reservoir can be increased by injecting the starch solution into the carbonate reservoir, and the water injection quantity can be increased, so that the water flooding effect is improved.
Illustratively, the injection of the starch solution into the injection well may be by a booster pump. The pressure in the carbonate reservoir is high, the injection speed can be influenced by directly injecting the starch solution, and the starch solution can rapidly enter the carbonate reservoir conveniently through the booster pump.
The reaction process of the starch solution in the carbonate reservoir may be referred to step S102, and a detailed description thereof is omitted.
And S506, stirring the starch solution in the injection well.
In the above embodiment, stirring the starch solution may serve to accelerate the reaction process.
For example, during injection of the starch solution into the injection well, the starch solution may be stirred by a stirring device, such as a stirring paddle.
And S507, judging the reaction condition in the carbonate reservoir according to the pressure of the carbonate reservoir.
In the above embodiment, the acetic acid reacts with the carbonate to produce carbon dioxide, and by measuring the pressure in the carbonate reservoir, it is convenient to know the reaction condition in the carbonate reservoir, thereby facilitating the development of subsequent work.
Alternatively, step S507 may be implemented by:
a. and detecting the pressure of the carbonate reservoir.
Illustratively, the pressure of the carbonate reservoir is determined using a pressure gauge connected to a surface pressure display so that the pressure of the carbonate reservoir is read by viewing the surface pressure display.
b. When the pressure of the carbonate reservoir is not changed all the time, the starch solution is not fully reacted with the carbonate in the carbonate reservoir, and at the moment, the fault needs to be checked and eliminated. When the pressure of the carbonate reservoir is gradually increased, the generation of carbon dioxide in the carbonate reservoir is indicated, the starch solution is reacting with the carbonate, and the carbonate is corroding. In the process, the starch solution is hydrolyzed in the carbonate reservoir to form glucose, the glucose is alcoholized, hydroformylated and acidified to form acetic acid, and the acetic acid reacts with carbonate in the carbonate reservoir to generate water-soluble substances which are consumed, so that the porosity of the carbonate reservoir is gradually improved, and the permeability of the carbonate reservoir is gradually improved. When the pressure of the carbonate reservoir is increased and kept unchanged, the reaction of the starch solution and the carbonate is basically finished, and no carbon dioxide is generated in the carbonate reservoir, so that the carbonate reservoir is proved to be corroded, the pores are increased, the porosity is improved, and the permeability is improved.
Fig. 6 is a flow chart of another method for improving reservoir permeability provided by an embodiment of the present disclosure, as shown in fig. 6, the method includes:
s601, selecting a carbonate reservoir as a target modification layer in the sedimentary rock oil and gas reservoir.
S602, injecting a glucose solution into the carbonate reservoir, wherein the glucose in the glucose solution forms acetic acid after alcoholization, hydroformylation and acidification, and the acetic acid reacts with carbonate in the carbonate reservoir to generate water-soluble substances which are consumed, so that the porosity of the carbonate reservoir is improved, and the permeability of the carbonate reservoir is improved.
In the embodiment, the glucose is alcoholized, hydroformylated and acidified to form acetic acid, the formed acetic acid finally reacts with carbonate in the carbonate reservoir, a certain amount of carbonate can be corroded, the porosity of the carbonate reservoir can be improved, the connectivity is enhanced, and the permeability of the carbonate reservoir is further improved.
It will be readily appreciated that the use of glucose instead of a starch solution corresponds to a saving in the process of starch breakdown to form glucose, thereby increasing the rate of acetic acid formation. The rest of the reaction process and effect are basically the same as the case of using starch solution, and are not described herein.
The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.
Claims (10)
1. A method of increasing permeability of a reservoir, the method comprising:
selecting a carbonate rock reservoir as a target modification layer in a sedimentary rock oil and gas reservoir;
and injecting a starch solution into the carbonate reservoir, wherein the starch solution forms glucose after being hydrolyzed in the carbonate reservoir, the glucose forms acetic acid after being alcoholized, hydroformylated and acidified, and the acetic acid reacts with carbonate in the carbonate reservoir to generate water-soluble substances which are consumed, so that the porosity of the carbonate reservoir is improved, and the permeability of the carbonate reservoir is improved.
2. The method of claim 1, wherein selecting a carbonate reservoir as a target pay zone comprises:
selecting the carbonate reservoir with the carbonate content of more than 30% as the target modification layer.
3. The method of claim 2, further comprising:
collecting drill cuttings carried in the slurry when the carbonate reservoir is drilled;
fully reacting the drill cuttings with hydrochloric acid, and measuring the generation amount of carbon dioxide in the reaction;
and calculating the content of the carbonate in the carbonate reservoir according to the generation amount of the carbon dioxide.
4. The method of claim 1, further comprising:
the amount of starch solution injected was calculated according to the following formula:
V＝π(r+10)2*d*Φ*k；
wherein V is the injection amount of the starch solution, r is the radius of an injection well, d is the thickness of the target modification layer, phi is the porosity of the target modification layer, k is a constant, and k is more than or equal to 20% and less than or equal to 30%;
and preparing the starch solution according to the calculated injection amount.
5. The method according to any one of claims 1 to 4, wherein the starch in the starch solution is cooked starch.
6. The method of any one of claims 1 to 4, wherein the starch in the starch solution comprises at least one of corn, wheat or potato.
7. The method according to any one of claims 1 to 4, wherein the solvent in the starch solution is reservoir water, or wherein the solvent in the starch solution has the same composition as the reservoir water.
8. The method according to any one of claims 1 to 4, wherein the concentration of the starch solution is 0.2% to 3%.
9. The method of any one of claims 1 to 3, wherein the injecting a starch solution into the carbonate reservoir comprises:
injecting a starch solution into the carbonate reservoir through an injection well, the injection well comprising at least one of a production well or a water injection well.
10. A method of increasing permeability of a reservoir, the method comprising:
selecting a carbonate rock reservoir as a target modification layer in a sedimentary rock oil and gas reservoir;
and injecting a glucose solution into the carbonate reservoir, wherein the glucose in the glucose solution forms acetic acid after alcoholization, hydroformylation and acidification, and the acetic acid reacts with carbonate in the carbonate reservoir to generate water-soluble substances which are consumed, so that the porosity of the carbonate reservoir is improved, and the permeability of the carbonate reservoir is improved.
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| WO2015057230A1 (en) * | 2013-10-17 | 2015-04-23 | Halliburton Energy Services, Inc. | Dual-purpose viscosifier and surface active additives and methods of use |
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