CN111101909A - Water jet assisted oil recovery method for bottom of difficultly-used reservoir - Google Patents
Water jet assisted oil recovery method for bottom of difficultly-used reservoir Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
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- 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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Abstract
The invention discloses a water jet assisted oil recovery method for the bottom of a difficultly used reservoir, which comprises the steps of firstly, carrying out fine cognition on an oil reservoir, finding a high-water-content and high-energy layer below a difficultly used layer and a non-principal layer, and taking the high-water-content and high-energy layer as an auxiliary layer; the auxiliary layer is high in water content and has no exploitation value, but the contained energy can suck the oil flow of the target layer out and send the oil flow to the ground under the action of the bottom jet flow auxiliary exploitation tool; the hard layer and the non-principal layer jointly form a production layer; the bottom jet flow auxiliary mining tool is put into the well, and the difficult-to-use layer and the non-main force layer, namely the production layer, are clamped and sealed by an upper packer and a lower packer, so that the production layer is isolated from the auxiliary layer; and (5) putting a pump down for production. The technology utilizes the negative pressure principle generated by water jet and Venturi tube, can improve the development benefits of low-liquid, low-energy and low-utilization layers, improve the utilization degree of oil reservoirs in blocks difficult to be utilized, improve the recovery ratio, and is also suitable for cold recovery of thickened oil.
Description
Technical Field
The invention relates to an oil field oil reservoir exploitation technology, in particular to a water jet assisted oil recovery method at the bottom of a reservoir difficult to be exploited.
Background
At present, as the eastern oil field of China successively enters an ultrahigh water content development stage, the development situation of the eastern old oil field is not optimistic. Taking a certain oil production plant of a victory oil field as an example, the unit has the production degree of up to 40 percent after more than 50 years of development and production, wherein the production degree of a part of high-permeability and high-liquid-content units reaches more than 50 percent, and even 2 units break through 60 percent. Under the development situation, the production increasing space of old oil fields is not enough to meet the requirement of continuous development of each unit. Therefore, it is necessary to develop an economical and effective development method, development technique, and cooperation model to promote effective utilization and improve the utilization efficiency of resources and assets.
Statistics of the victory oil field shows that the double-low unit in the oil field has high storage capacity, low extraction degree and oil extraction speed of only 0.16%. Therefore, how to improve the single-well production capacity of the low-yield, low-liquid and low-water-content well is an important starting point in the next step and is also a potential point of the old oil field with ultrahigh water content. This potential space consists of two parts, the medium-low permeability small fault block and the non-dominant layer in the medium-high permeability unit.
At present, the yield increase of wells aiming at low yield, low liquid and low water-containing wells mainly depends on measures of acidification, fracturing and water plugging. Aiming at the medium-low permeability small fault block, the permeability of an oil layer is improved mainly through acidification and fracturing measures, and the produced liquid is increased, but the acidification period of validity is short, the effect is not obvious, the fracturing cost is high, and the cost performance is low. The water plugging efficiency is low, the effective period is short, and the water plugging method cannot be used as a main measure for increasing the yield.
The basic idea of the tool is to seal a target layer through a packer, and by utilizing the negative pressure principle generated by water jet and a venturi tube, in the production process of a high-energy and high-water-bearing layer, fluid forms negative pressure when passing through the tool, and negative pressure is generated at the target layer to produce oil gas, so that the development benefits of low-liquid, low-energy and low-use layers are improved, and the tool is also suitable for cold production of thick oil.
Application No.: 201410694104.7 discloses a negative pressure exploitation device and method for oil and gas field, which is an underground fluid exploitation technology for oil and gas field, comprising a set of underground combined pipe column and a ground negative pressure device, wherein the discharge part of the combined pipe column is connected with a pump inlet pipe; the pump inlet pipe is connected with a pump inlet valve which is fixed at the bottom of the cylinder body, the upper part of the cylinder body is fixed with a pump outlet valve, and the pump outlet valve is connected with a pump outlet pipe; the inner side of the bottom of the cylinder body is connected with an electromagnetic valve; the main body of the ground negative pressure device is a cylinder body, the cylinder body is a piston inner cavity, a main piston and an auxiliary piston are arranged in the middle of the cylinder body, and the main piston and the auxiliary piston are of an integrated structure; a sealing cylinder is arranged in the cylinder body; one end of the hydraulic inlet pipe is connected to the pump body, the other end of the hydraulic inlet pipe is connected with the liquid storage tank, and the hydraulic pump is arranged in the middle of the hydraulic inlet pipe; the liquid storage tank is connected with a hydraulic return pipe.
Application No.: 201220084613.4 discloses a multistage automatic negative pressure oil production instrument, belongs to oil production equipment technical field, characterized by: the thread protector is connected with the liquid inlet floral tube from bottom to top; the liquid inlet floral tube is connected with the lower coupling; the check valve is welded with the central pipe and combined together; the lower coupling is connected with the central pipe; the lower spacer ring, the leather cup and the upper spacer ring penetrate through the central pipe and are fastened by the locking ring; the central pipe is connected with the upper coupling. The beneficial effects are that: firstly, the physical method is used for oil extraction, so that an oil layer is not damaged, and the environment is not polluted; secondly, the processing is simple and the construction is convenient; thirdly, the investment is less and the effect is quick; fourthly, the underground automatic operation is carried out for a long time; fifthly, the method is more suitable for domestic low-permeability oil fields; sixth, the oil well can avoid the pollution and damage of the flushing liquid to the oil layer when the oil well is flushed.
Application No.: 200420066298.8 relates to a vacuum negative pressure oil recovery device. The oil pumping pipe column is arranged in the oil sleeve, the oil sleeve is communicated with an oil pumping well, the oil pumping pipe column is communicated with a vacuum storage tank through a pipeline, and the vacuum storage tank is communicated with the air pump and the oil well pump through an air inlet pipe and an oil delivery pipe; the low-permeability stratum petroleum is extracted by utilizing the vacuum negative pressure principle, so that the gathering and extraction of the crude oil at the bottom of the low-pressure low-yield oil well are facilitated, and the daily yield of the crude oil is rapidly improved; the low-permeability oil layer is fully exploited and utilized, and the oil production is increased; the utility model discloses simple structure, economical and practical, convenient to use, safety are suitable for the transformation installation of internal low permeability oil field, low pressure low yield oil well and use.
The technical schemes of the above publications are all different from the invention.
Disclosure of Invention
The invention aims to provide a water jet assisted oil recovery method at the bottom of a difficultly-used reservoir, which utilizes the principle of negative pressure generated by water jet and a Venturi tube, can improve the development benefits of low-liquid, low-energy and low-used layers, improve the using degree of oil reservoirs in difficultly-used blocks, improve the recovery ratio and is also suitable for cold recovery of thickened oil.
In order to achieve the purpose, the invention adopts the following technical scheme that the water jet assisted oil recovery method for the bottom of the difficultly-used reservoir comprises the following steps:
firstly, performing fine cognition on an oil reservoir, finding a high-water-content and high-energy layer below a difficult-to-use layer and a non-principal layer, and taking the high-water-content and high-energy layer as an auxiliary layer; the auxiliary layer is high in water content and has no exploitation value, but the contained energy can suck the oil flow of the target layer out and send the oil flow to the ground under the action of the bottom jet flow auxiliary exploitation tool; the hard layer and the non-principal layer jointly form a production layer;
secondly, a bottom jet flow auxiliary mining tool is put into the well, and the difficult-to-use layer and the non-main force layer, namely the production layer, are clamped and sealed by an upper packer and a lower packer, so that the production layer is isolated from the auxiliary layer;
fourthly, the pump is lowered for production, under the action of the pumping of the pump and the energy of the auxiliary layer, the high-water-content fluid enters the bottom jet flow auxiliary mining tool at a certain flow rate, passes through the jet hole, the channel is reduced, the speed is increased, negative pressure is formed in the mixing pipe, the low-water-content oil flow in the difficult-to-use layer and the non-main force layer is sucked out and mixed with the high-water-content fluid in the diffusion pipe, and the liquid production capacity is improved; produced to the surface under the pumping action of the pump.
If the auxiliary layer produces sand, the hanging screen pipe can prevent formation subdivision sand from entering the bottom jet flow auxiliary mining tool.
The bottom jet flow auxiliary mining tool comprises a diffusion pipe, a mixing pipe, a lower connecting sleeve and a jet pipe, wherein an upper port of the mixing pipe is connected with a lower port of the diffusion pipe, a lower port of the mixing pipe is connected with a lower connecting sleeve upper port, the inner diameter of the mixing pipe is smaller than that of the lower port of the diffusion pipe, the jet pipe is arranged in the lower connecting sleeve, a jet hole is formed in the upper end of the jet pipe, an upper port of the jet hole is located in the center of the lower port of the mixing pipe, the mixing pipe is provided with a suction inlet which is radially communicated, an outward suction pipe is installed on the suction inlet, and the suction; the inner diameter of the jet hole is smaller than the inner diameter of the suction inlet, and the inner diameter of the suction inlet is smaller than the inner diameter of the mixing pipe; the upper port of the diffusion pipe is connected with an upper packer, and the lower port of the lower sleeve is connected with a lower packer; the upper end of the upper packer is connected with a sieve tube, the upper end of the sieve tube is connected with a releasing anti-jack, the lower end of the lower packer is connected with a filter hanging sieve tube, the lower end of the filter hanging sieve tube is connected with a plug, and the filter hanging sieve tube corresponds to the auxiliary layer.
The outer wall of the lower half section of the jet pipe and the inner wall of the lower sleeve are connected into an integral structure, and a sundry depositing annular space is formed between the outer wall of the upper half section of the jet pipe and the inner wall of the lower sleeve; the diffusion pipe, the mixing pipe, the lower connecting sleeve and the jet pipe are connected into an integrated mechanism.
In the diffusion tube inner chamber, the internal diameter of well upper portion position is the biggest, and from the middle upper portion to diffusion tube lower port, the internal diameter diminishes gradually, and from the middle upper portion position to diffusion tube upper port, the internal diameter diminishes gradually, but diffusion tube upper port internal diameter is greater than diffusion tube lower port internal diameter.
Compared with the prior art, the invention has the following beneficial effects:
after the underground oil reservoir is recognized, a high-water-content and high-energy layer system exists below part of the difficult-to-use layer system. Firstly, an auxiliary exploitation tool is put into the difficult exploitation stratum, and by means of the energy of the lower high-water-content and high-energy stratum and the pumping capacity of the pump, when fluid passes through the bottom auxiliary exploitation tool, negative pressure is formed at the difficult exploitation stratum, oil flow in the difficult exploitation reservoir is sucked out, the sucked oil flow is mixed with the lower fluid, and the oil flow and the lower fluid are jointly exploited to the ground under the pumping action of the pump.
The target layer is sealed by a packer, and by utilizing the negative pressure principle generated by water jet and a Venturi tube, in the production process of a high-energy and high-water-bearing layer, fluid forms negative pressure when passing through a tool, and negative pressure is generated at the target layer to extract oil gas, so that the development benefits of low-liquid, low-energy and low-use layers are improved, and the method is also suitable for cold recovery of thick oil.
The invention relates to a tool for improving the recovery ratio of low-permeability, low-liquid, low-energy blocks and difficultly-exploited oil reservoirs in an oil field, in particular to an underground tool for auxiliary exploitation.
Drawings
FIG. 1 is a schematic view of a bottom jet assisted production tool configuration to which the method of the present invention is applied.
In the figure: 1-releasing top prevention, 2-sieve tube, 3-upper packer, 8-lower packer, 4-diffusion tube, 5-suction inlet, 6-mixing tube, 7-jet hole, 9-filter-hanging sieve tube and 10-plug.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
According to the figure 1, the method for assisting the production of the oil well under the well comprises the following steps:
firstly, performing fine cognition on an oil reservoir, finding a high-water-content high-energy layer below a difficult-to-use layer and a non-principal layer, and taking the high-water-content high-energy layer as an auxiliary layer; the auxiliary layer is high in water content and has no exploitation value, but the contained energy can suck the oil flow of the target layer out and send the oil flow to the ground under the action of the bottom jet flow auxiliary exploitation tool;
secondly, the bottom jet flow auxiliary mining tool is put into the underground, and the layer difficult to be used and the non-principal layer are clamped and sealed by an upper packer 3 and a lower packer 8 so as to be isolated from the auxiliary layer;
fourthly, the pump is lowered for production, under the action of the pumping of the pump and the energy of the auxiliary layer, the high-water-content fluid enters the bottom jet flow auxiliary mining tool at a certain flow rate, passes through the jet hole 7, the channel is reduced, the speed is increased, negative pressure is formed in the mixing pipe 6, the low-water-content oil flow in the difficult-to-use layer and the non-main force layer is sucked out and mixed with the high-water-content fluid in the diffusion pipe, and the liquid production capacity is improved; produced to the surface under the pumping action of the pump.
Meanwhile, if the auxiliary layer produces sand, the hanging filter screen pipe 9 can prevent the formation subdivided sand from entering the auxiliary mining tool.
Referring to fig. 1, the bottom jet flow auxiliary mining tool includes a diffusion pipe 4, a mixing pipe 6, a lower adapter sleeve and a jet pipe, wherein an upper port of the mixing pipe 6 is connected with a lower port of the diffusion pipe 4, a lower port of the mixing pipe 6 is connected with a lower upper port of the lower adapter sleeve, an inner diameter of the mixing pipe is smaller than an inner diameter of the lower port of the diffusion pipe, the jet pipe is arranged in the lower adapter sleeve, a jet hole 7 is formed in the upper end of the jet pipe, an upper port of the jet hole is located in the center of the lower port of the mixing pipe, and the mixing pipe is provided with.
The suction inlet is provided with a suction pipe facing outwards, and the suction pipe corresponds to the production layer; the inner diameter of the jet hole 7 is smaller than the inner diameter of the suction inlet, and the inner diameter of the suction inlet 5 is smaller than the inner diameter of the mixing pipe.
The outer wall of the lower half section of the jet pipe and the inner wall of the lower sleeve are connected into an integral structure, and a sundry depositing annular space is formed between the outer wall of the upper half section of the jet pipe and the inner wall of the lower sleeve.
In the 4 inner chambers of diffuser pipes, the internal diameter of well upper portion position is the biggest, and from the upper middle portion to diffuser pipe lower port, the internal diameter diminishes gradually, and from the upper middle portion position to diffuser pipe upper port, the internal diameter diminishes gradually, but diffuser pipe upper port internal diameter is greater than diffuser pipe lower port internal diameter.
The upper port of the diffusion pipe is connected with an upper packer 3, and the lower port of the lower sleeve is connected with a lower packer 8.
The upper end of the upper packer is connected with a sieve tube 2, and the upper end of the sieve tube is connected with a releasing anti-jack 1.
The lower end of the lower packer is connected with a filter hanging screen pipe 9, the lower end of the filter hanging screen pipe is connected with a plug 10, and the filter hanging screen pipe corresponds to the auxiliary layer.
The diffusion pipe, the mixing pipe, the lower connecting sleeve and the jet pipe are connected into an integrated mechanism.
The tool is mainly used for exploiting oil flow in a low-liquid, low-energy and low-use layer by applying a negative pressure principle generated by a water jet and a Venturi tube.
The invention realizes the development and production of low-permeability, low-liquid, low-water-content and low-energy oil layers and non-main-force layers and realizes the cold production of thickened oil. The oil field development benefit can be improved, and the resource asset utilization efficiency can be improved.
In the description of the present invention, it is to be understood that the positional indications or positional relationships are based on those shown in the drawings and are for the purpose of facilitating the description of the present invention, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present invention.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A water jet assisted oil recovery method for the bottom of a refractory reservoir is characterized by comprising the following steps:
firstly, performing fine cognition on an oil reservoir, finding a high-water-content and high-energy layer below a difficult-to-use layer and a non-principal layer, and taking the high-water-content and high-energy layer as an auxiliary layer; the auxiliary layer is high in water content and has no exploitation value, but the contained energy can suck the oil flow of the target layer out and send the oil flow to the ground under the action of the bottom jet flow auxiliary exploitation tool; the hard layer and the non-principal layer jointly form a production layer;
secondly, a bottom jet flow auxiliary mining tool is put into the well, and the difficult-to-use layer and the non-main force layer, namely the production layer, are clamped and sealed by an upper packer and a lower packer, so that the production layer is isolated from the auxiliary layer;
fourthly, the pump is lowered for production, under the action of the pumping of the pump and the energy of the auxiliary layer, the high-water-content fluid enters the bottom jet flow auxiliary mining tool at a certain flow rate, passes through the jet hole, the channel is reduced, the speed is increased, negative pressure is formed in the mixing pipe, the low-water-content oil flow in the difficult-to-use layer and the non-main force layer is sucked out and mixed with the high-water-content fluid in the diffusion pipe, and the liquid production capacity is improved; produced to the surface under the pumping action of the pump.
2. The method of claim 1, wherein if the secondary layer is sand producing, the screen pipe prevents formation fines from entering the bottom jet assisted production tool.
3. The method for bottom water jet assisted production of a difficultly-exploited reservoir according to claim 1 or 2, characterized in that the bottom jet assisted production tool comprises a diffusion pipe, a mixing pipe, a lower joint sleeve and a jet pipe, wherein an upper port of the mixing pipe is connected with a lower port of the diffusion pipe, a lower port of the mixing pipe is connected with a lower port of the lower joint sleeve, the inner diameter of the mixing pipe is smaller than that of the lower port of the diffusion pipe, the jet pipe is arranged inside the lower joint sleeve, a jet hole is formed in the upper end of the jet pipe, an upper port of the jet hole is positioned in the center of the lower port of the mixing pipe, the mixing pipe is provided with a radially-through suction port, an outward-facing suction pipe is mounted on the suction port; the inner diameter of the jet hole is smaller than the inner diameter of the suction inlet, and the inner diameter of the suction inlet is smaller than the inner diameter of the mixing pipe; the upper port of the diffusion pipe is connected with an upper packer, and the lower port of the lower sleeve is connected with a lower packer; the upper end of the upper packer is connected with a sieve tube, the upper end of the sieve tube is connected with a releasing anti-jack, the lower end of the lower packer is connected with a filter hanging sieve tube, the lower end of the filter hanging sieve tube is connected with a plug, and the filter hanging sieve tube corresponds to the auxiliary layer.
4. The bottom water jet assisted oil recovery method for the difficultly-exploited reservoir as claimed in claim 3, characterized in that the outer wall of the lower half section of the jet pipe and the inner wall of the lower sleeve are connected into an integrated structure, and an impurity depositing annular space is formed between the outer wall of the upper half section of the jet pipe and the inner wall of the lower sleeve; the diffusion pipe, the mixing pipe, the lower connecting sleeve and the jet pipe are connected into an integrated mechanism.
5. The method of claim 3, wherein the inner diameter of the inner cavity of the diffuser pipe is largest at a middle upper position, and gradually becomes smaller from the middle upper position to the lower port of the diffuser pipe, and gradually becomes smaller from the middle upper position to the upper port of the diffuser pipe, but the inner diameter of the upper port of the diffuser pipe is larger than that of the lower port of the diffuser pipe.
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| CN201811254438.7A CN111101909A (en) | 2018-10-25 | 2018-10-25 | Water jet assisted oil recovery method for bottom of difficultly-used reservoir |
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| CN201811254438.7A CN111101909A (en) | 2018-10-25 | 2018-10-25 | Water jet assisted oil recovery method for bottom of difficultly-used reservoir |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111502614A (en) * | 2020-05-06 | 2020-08-07 | 长江大学 | Oil production pipe suitable for multi-oil layer combined production |
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