CN110397429B - Oil-gas field production increasing technology based on hydro-electric effect and rock pressure expansion - Google Patents
Oil-gas field production increasing technology based on hydro-electric effect and rock pressure expansion Download PDFInfo
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- CN110397429B CN110397429B CN201910834944.1A CN201910834944A CN110397429B CN 110397429 B CN110397429 B CN 110397429B CN 201910834944 A CN201910834944 A CN 201910834944A CN 110397429 B CN110397429 B CN 110397429B
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
An oil and gas field production increasing technology based on a liquid electric effect and rock crushing and swelling comprises the following steps: (1) the strong pulse excitation source acts on a target reservoir stratum; (2) detecting the stress characteristic of reservoir rock in real time; (3) selecting an optimal uneven compression and expansion coefficient according to the stress characteristics of reservoir rock; controlling the strength of the pulse source to ensure that the maximum principal stress of the reservoir is greater than one half of the compressive strength of the rock; (4) and controlling the amplitude and the superposition time delay of the high-energy pulse wave, and prolonging the action time of the reservoir rock under the optimal stress non-uniformity coefficient. The control of rock stress state is realized by superposition of high-energy shock waves; (5) the reservoir rock is in a pressure expansion state for a long time, so that the rock fracture tendency is increased, the permeability is improved, and the environment-friendly yield increase is realized. The method takes continuous high-energy controllable electric pulses as an excitation source, adaptively adjusts pulse amplitude and superposition time delay according to the stress-strain state of reservoir rock, and establishes a resource-saving and environment-friendly oil and gas field production increasing technology by utilizing the liquid-electric effect and the rock compression expansion characteristic.
Description
Technical Field
The invention belongs to the field of unconventional shale oil and gas, and particularly relates to a method for improving physical properties of a shale oil and gas reservoir based on a hydro-electric effect and rock crushing and swelling characteristics.
Background
Shale oil and gas resources in China are rich, the geologic reserves of shale gas are cumulatively ascertained to be 7643 billions of cubic meters in the Sichuan basin and the peripheral marine strata. Among them, the Chongqing Fuling shale gas field cumulatively ascertains geological reserves 6008 billion cubic meters, becoming the largest shale gas field outside North America. The basic geological conditions of the shale gas in China are complex, the exploration and development of the shale gas face a plurality of difficulties and challenges, but the development of the shale gas in China has wide prospects under the favorable conditions of wide shale distribution, multiple strata, large shale gas resource quantity and the like.
The geological conditions of China are complex and complicated, and are particularly obvious in aspects of structural evolution, deposition environment, thermal evolution process and the like, so that the shale oil and gas formation and enrichment in different regions of China have many differences. The shale gas sea phase shale has high thermal evolution degree and strong construction activity; the continental facies shale has low thermal evolution degree and strong distribution heterogeneity, and a targeted technology is required for effective development; the problems of water resource, environmental protection and the like are also faced during mining, and the cost is reduced by adopting an applicable technology.
Rock porosity is an important space for storing oil and gas and a key parameter for determining free gas content. Statistically, an average of around 50% of the shale gas is stored in the pores of the shale matrix. The reservoir micro-fractures comprise underground original fractures and later-period artificial fractures, can provide sufficient storage space and migration channels for shale oil and gas, and can effectively improve the shale oil and gas yield. Without developing fractures, the shale permeability is very low.
Under the action of certain triaxial non-uniform compressive stress, the volume of the rock is increased, the porosity and the permeability are also increased, and the strength is reduced. By utilizing the compression and expansion characteristics of the rock, the relation between the amplitude and the time of the excitation source is changed, the proportion of compaction and loosening deformation can be controlled, the large positive time of the stress non-uniform coefficient is prolonged, and the effectiveness of pulse compaction can be improved; the loosening effect can be improved by prolonging the time when the stress unevenness coefficient is small and positive.
The existing pressure expansion loosening production increasing technology adopts a plurality of explosive packages to explode at certain time intervals, and the condition that the rock generates pressure expansion is met by overlapping explosion waves. However, the energy of the shock wave generated by the explosive is uncontrollable and cannot act on the casing uniformly, so that the casing is easily damaged. And the pollutants generated in the explosion process have serious influence on the environment, and the benefit is very little.
The high-voltage strong electric field passes through the liquid, and the liquid in the channel is quickly vaporized and expanded to cause explosion due to the fact that huge energy is instantaneously released into the discharge channel. The continuous high-energy controllable electric pulse excitation source developed by utilizing the characteristic can effectively promote rock pressure expansion, save resources, and is safe and environment-friendly.
The invention combines the advantages of the pulse power technology and the rock pressure expansion production increasing technology for the first time at home and abroad, the device adaptively adjusts the pulse amplitude and the superposition time delay according to the stress-strain state of the reservoir rock, establishes the resource-saving and environment-friendly oil and gas field production increasing technology by utilizing the liquid-electric effect and the rock pressure expansion characteristic, and has the excellent characteristics of low pollution, low energy consumption and the like. And a new technical direction is provided for shale oil and gas reservoir improvement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art and provides an oil-gas field production increasing technology based on the hydro-electric effect and rock pressure expansion. The method can effectively increase the fracture tendency of rocks, promote the development of reservoir gaps, improve the permeability and realize environment coordination and friendly yield increase.
The technical solution of the invention is as follows: the oil-gas field production increasing technology based on the liquid-electricity effect and rock crushing and swelling comprises the following steps:
(1) the strong pulse excitation source acts on a target reservoir stratum;
(2) detecting the stress characteristic of reservoir rock in real time;
(3) selecting an optimal uneven compression and expansion coefficient according to the stress characteristics of reservoir rock; controlling the strength of the pulse source to ensure that the maximum principal stress of the reservoir is greater than one half of the compressive strength of the rock;
(4) and the amplitude and the superposition time delay of high-energy pulse waves formed by the hydro-electric effect are controlled, and the action time of reservoir rock under the optimal stress non-uniformity coefficient is prolonged. The control of rock stress state is realized by superposition of high-energy shock waves;
(5) the reservoir rock is in a pressure expansion state for a long time, so that the fracture tendency of the rock is increased, the development of reservoir gaps is promoted, the permeability is improved, and environment coordination and friendly yield increase are realized.
In addition, the invention also provides an oil and gas field production increasing device based on the hydro-electric effect and rock crushing and expansion, which comprises an electric pulse excitation source, a pulse control unit, an energy storage unit and a stress state detection unit, wherein the electric pulse excitation source, the pulse control unit, the energy storage unit and the stress state detection unit are sealed in a steel pipe and are connected with a control device on an oil and gas well through a bridle and a logging cable.
The embodiment of the invention has the following advantages:
(1) the invention combines the advantages of the pulse power technology and the rock pressure expansion production increasing technology for the first time at home and abroad, uses continuous high-energy controllable electric pulses as an excitation source, controls the stress state of the rock by superposing pulse waves, and realizes the pressure expansion production increasing.
(2) Rock is in a complex stress-strain state under natural conditions, and gravity, tectonic stress, saturated fluid conditions and geometry all affect the rock. The device comprises a real-time detection system for the stress state of the rock underground, the pulse amplitude and the superposition time delay are adaptively adjusted according to the stress-strain state of the rock of a reservoir stratum, and a resource-saving and environment-friendly oil and gas field production increasing technology is established by utilizing the hydro-electric effect and the rock compression expansion characteristic. The technology can reduce the plasticity and toughness of the shale oil and gas reservoir, increase the brittle fracture tendency of the reservoir, promote the development of micro-cracks of the shale oil and gas reservoir, improve the permeability of the reservoir near a shale oil and gas shaft and achieve the aims of improving the reservoir of the shale oil and gas well, stabilizing the yield and increasing the yield.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a flow chart of a technical method for increasing production of oil and gas fields based on the hydro-electric effect and rock swelling according to the invention.
Fig. 2 is a schematic diagram of an oil and gas field stimulation device design based on the hydro-electric effect and rock swelling according to the invention.
Figure 3 is a diagram of an oil and gas field stimulation tool based on the hydro-electric effect and rock swelling according to the present invention. The device comprises an electric pulse excitation source (7), a pulse control unit (6), an energy storage unit (5) and a stress state detection unit (4) which are sealed in a steel pipe and connected with a control device (1) on an oil-gas well through a bridle (3) and a logging cable (2).
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figure 3, the invention provides an oil and gas field production increasing device based on a liquid electricity effect and rock swelling, which comprises an electric pulse excitation source (7), a pulse control unit (6), an energy storage unit (5) and a stress state detection unit (4), wherein the electric pulse excitation source, the pulse control unit, the energy storage unit and the stress state detection unit are sealed in a steel pipe and are connected with a control device (1) on an oil and gas well through a bridle (3) and a logging cable (2).
According to the above device, as shown in fig. 1 and fig. 2, the present invention provides an oil and gas field stimulation technique based on the hydro-electric effect and rock swelling, which comprises the following steps:
(1) the strong pulse excitation source acts on a target reservoir stratum;
(2) detecting the stress characteristic of reservoir rock in real time;
(3) selecting an optimal uneven compression and expansion coefficient according to the stress characteristics of reservoir rock; controlling the strength of the pulse source to ensure that the maximum principal stress of the reservoir is greater than one half of the compressive strength of the rock;
(4) and the amplitude and the superposition time delay of high-energy pulse waves formed by the hydro-electric effect are controlled, and the action time of reservoir rock under the optimal stress non-uniformity coefficient is prolonged. The control of rock stress state is realized by superposition of high-energy shock waves;
(5) the reservoir rock is in a pressure expansion state for a long time, so that the fracture tendency of the rock is increased, the development of reservoir gaps is promoted, the permeability is improved, and environment coordination and friendly yield increase are realized.
The method combines the advantages of the pulse power technology and the rock pressure expansion production increasing technology for the first time at home and abroad, uses continuous high-energy controllable electric pulses as an excitation source, and controls the stress state of the rock by superposing pulse waves to realize the pressure expansion production increasing. Has the advantages of low pollution, low energy consumption and the like.
The device comprises a real-time detection system for the stress state of the rock underground, the pulse amplitude and the superposition time delay are adaptively adjusted according to the stress-strain state of the rock of a reservoir stratum, and a resource-saving and environment-friendly oil and gas field production increasing technology is established by utilizing the liquid-electric effect and the rock compression expansion characteristic. The technology can reduce the plasticity and toughness of the shale oil and gas reservoir, increase the brittle fracture tendency of the reservoir, promote the development of micro-cracks of the shale oil and gas reservoir, improve the permeability of the reservoir near a shale oil and gas shaft and achieve the aims of improving the reservoir of the shale oil and gas well, stabilizing the yield and increasing the yield.
In addition, in the step (1), the excitation source is a high-voltage strong pulse excitation source based on the liquid-electric effect, and the amplitude and the superposition frequency of the excitation source are controllable.
In addition, in the step (2), the rock stress characteristic is detected by underground real-time monitoring, and compared with laboratory analysis after field sampling, the complex stress-strain state of the rock under the natural condition is better reserved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the present invention without departing from the technical spirit of the present invention.
Claims (4)
1. A method for increasing the yield of an oil-gas field based on a liquid-electricity effect and rock crushing and swelling is characterized by comprising the following steps: which comprises the following steps:
(1) the strong pulse excitation source acts on a target reservoir stratum;
(2) detecting the stress characteristic of reservoir rock in real time;
(3) selecting an optimal uneven compression and expansion coefficient according to the stress characteristics of reservoir rock; controlling the strength of the strong pulse excitation source to ensure that the maximum principal stress of the reservoir is greater than one half of the compressive strength of the rock;
(4) controlling the amplitude and the superposition time delay of high-energy pulse waves formed by the hydro-electric effect, prolonging the action time of reservoir rock under the optimal differential coefficient of pressure expansion, and realizing rock stress state control by utilizing the superposition of the high-energy pulse waves;
(5) the reservoir rock is in a pressure expansion state for a long time, so that the fracture tendency of the rock is increased, the development of reservoir gaps is promoted, the permeability is improved, and environment coordination and friendly yield increase are realized.
2. The oil and gas field stimulation method based on the hydro-electric effect and rock swelling according to claim 1, characterized in that: in the step (1), the excitation source is a high-voltage strong pulse excitation source based on the liquid electricity effect, and the amplitude and the superposition frequency of the excitation source are controllable.
3. The oil and gas field stimulation method based on the hydro-electric effect and rock swelling according to claim 1, characterized in that: in the step (2), the rock stress characteristic is detected by underground real-time monitoring, and compared with laboratory analysis after field sampling, the complex stress-strain state of the rock under natural conditions is better reserved.
4. An oil and gas field production increasing device for the oil and gas field production increasing method based on the hydro-electric effect and rock swelling as claimed in claim 1, characterized by comprising an electric pulse excitation source (7), a pulse control unit (6), an energy storage unit (5) and a stress state detection unit (4), wherein the electric pulse excitation source (7) is connected with the pulse control unit (6), the energy storage unit (5) and the stress state detection unit (4) are all sealed in a steel pipe, the stress state detection unit (4) is connected with a bridle (3), and the bridle (3) is connected with a control device (1) on an oil and gas well through a logging cable (2).
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| CN201910834944.1A CN110397429B (en) | 2019-09-05 | 2019-09-05 | Oil-gas field production increasing technology based on hydro-electric effect and rock pressure expansion |
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| SU407033A1 (en) * | 1971-12-31 | 1975-09-15 | Раменское отделение Всесоюзного научно-исследовательского института геофизических методов разведки | Device for fracturing the well pressure of powder gases |
| GB9308884D0 (en) * | 1993-04-29 | 1993-06-16 | Archaeus Tech Group | Acidising oil reservoirs |
| CN106382108B (en) * | 2016-10-21 | 2019-07-16 | 河南神华能源工程有限公司 | Well fracturing and removal and stimulation method based on CO2 gas phase fracturing technique |
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