CN110500080B - High-permeability bottoming water coning shut-in well plugging dredging production control comprehensive treatment method - Google Patents
High-permeability bottoming water coning shut-in well plugging dredging production control comprehensive treatment method Download PDFInfo
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Abstract
The invention provides a comprehensive treatment method for plugging, dredging and controlling shut-in and shut-off wells along a high-permeability water cone with a bottom, and belongs to the field of oil and gas exploitation. According to the comprehensive treatment method for blocking, dredging, exploiting and controlling the shut-in well along the high-permeability bottom water coning, provided by the invention, the comprehensive treatment concept of 'blocking, dredging, exploiting and controlling' is inherited, nitrogen foam is firstly used for selectively blocking water, then high-pressure supercritical carbon dioxide is used for seismic crushing of a reservoir stratum, hydrophobic shunting is realized, supercritical carbon dioxide is used for exploiting condensate oil gas, the recovery ratio is improved, finally a water control agent is used for controlling water outlet of a low water-bearing area and preventing water outlet of the low water-bearing area, and through the four steps of treatment, the control of the high-permeability bottom water coning is realized, the oil gas recovery ratio is improved, and the service life of an oil gas well is prolonged.
Description
Technical Field
The invention relates to the technical field of oil and gas exploitation, in particular to a comprehensive treatment method for plugging, dredging and controlling shut-in wells along a high-permeability bottom water cone.
Background
The bottom water coning is one of the difficulties in the development of the bottom water oil and gas reservoir, and the research on the bottom water coning rule and the control method thereof have important significance for improving the development effect of the bottom water oil and gas reservoir due to the complex seepage mechanism of the bottom water oil and gas reservoir. However, in the process of oil and gas development in the prior art, the water content of an oil-gas layer is increased due to bottom water coning, and bottom water can enter a shaft, so that the oil and gas production is influenced, the yield is greatly reduced, even production is stopped, the stratum collapse, the casing deformation and the scrapping of an oil and gas well can be caused, and the normal production and the service life of the oil and gas well are seriously influenced.
Disclosure of Invention
In view of the above, the invention aims to provide a comprehensive treatment method for shut-in well plugging, dredging and production control along a high-permeability bottoming water cone. The comprehensive treatment method provided by the invention can realize control of water coning along the high permeability zone bottom, improve the recovery ratio and prolong the service life of the oil-gas well.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a high-permeability plugging, dredging, extracting and controlling comprehensive treatment method for a water cone entering shut-in well with a bottom, which comprises the following steps:
(1) carrying out nitrogen foam selective water plugging on a large water outlet channel along a high-permeability zone, wherein the crack angle of the high-permeability zone is 50-90 degrees;
(2) carrying out seismic crushing on the reservoir stratum of the high-permeability zone by using high-pressure supercritical carbon dioxide to realize hydrophobic diversion;
(3) exploiting the condensate oil gas by utilizing the characteristic of supercritical carbon dioxide;
(4) and controlling the water outlet of the low-water-bearing area by using a water control agent, wherein the water control agent comprises aggregate and a hydrophobic oleophilic gas film layer coated on the surface of the aggregate.
Preferably, the nitrogen foam is composed of nitrogen, a surfactant and active jelly, and the mass ratio of the nitrogen to the surfactant to the active jelly is 2-3: 1-2: 7-5.
Preferably, the surfactant is sodium dodecyl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate or sulfobetaine.
Preferably, the active jelly comprises 0.5% of thickening agent, 0.3% of rheological additive, 0.2% of temperature regulator and 99% of clear water.
Preferably, during the earthquake type crushing, the pumping pressure of the supercritical carbon dioxide is 75-100 MPa.
Preferably, when the condensate oil gas is produced, the pumping pressure of the supercritical carbon dioxide is 75-100 MPa.
Preferably, the aggregate comprises quartz sand and/or ceramsite.
Preferably, the thickness of the hydrophobic oleophilic gas membrane layer is 10-12 μm.
Preferably, the water control rate of the water control agent is more than or equal to 90%, and the particle size is 16-300 meshes.
The invention provides a comprehensive treatment method for plugging, dredging and controlling shut-in wells along a high-permeability bottoming water cone, which comprises the following steps:
(1) carrying out nitrogen foam selective water plugging on a large water outlet channel along a high-permeability zone, wherein the crack angle of the high-permeability zone is 50-90 degrees;
(2) carrying out seismic crushing on the reservoir stratum of the high-permeability zone by using high-pressure supercritical carbon dioxide to realize hydrophobic diversion;
(3) exploiting the condensate oil gas by utilizing the characteristic of supercritical carbon dioxide;
(4) and controlling the water outlet of the low-water-bearing area by using a water control agent, wherein the water control agent comprises aggregate and a hydrophobic oleophilic gas film layer coated on the surface of the aggregate.
The comprehensive treatment method for closing and dredging shut-in well along high-permeability bottom water coning provided by the invention inherits the comprehensive treatment concept of 'blocking, dredging, mining and controlling', firstly selectively blocks water by using nitrogen foam, and generates a high-strength foam water blocking layer by using a nitrogen foam water blocking process, so that an invasion channel on a water body can be effectively blocked, bottom water is prevented from coning along a high-permeability flow channel again in the future production process, then high-pressure supercritical carbon dioxide is used for carrying out earthquake-type crushing on a reservoir stratum to realize hydrophobic diversion, then supercritical carbon dioxide is used for exploiting condensate oil gas to improve the recovery ratio, finally a water control agent is used for controlling the water outlet of a low water-bearing area to prevent the water outlet of the low water-bearing area, and through the four steps, the control along the high-permeability bottom water coning is realized, the recovery ratio is improved, the service life of an oil-gas well is prolonged, the problem that the bottom water is scurred into a shaft in the prior art to influence the oil-gas production and the oil-gas production is solved, the yield is greatly reduced or even shut-out, even cause the stratum to collapse, the sleeve pipe warp, the oil gas well is scrapped, seriously influences the normal production of oil gas well and the problem of life-span.
Drawings
FIG. 1 is a schematic diagram of the distribution of condensate and condensate in a condensate well;
FIG. 2 is a gas-liquid two-phase distribution plot of a hydrocarbon reservoir at different temperatures and pressures;
FIG. 3 is a schematic diagram of a water control mechanism of the water control agent;
FIG. 4 is a schematic illustration of a foam blocking layer formed from nitrogen foam;
FIG. 5 is a comparison of conventionally fractured fractures and fractures formed from a supercritical carbon dioxide seismically fractured reservoir;
FIG. 6 is a diagram of a water control agent;
FIG. 7 is a result of a water permeability test of water control agents of different concentrations at an aperture radius of 0.1 mm;
FIG. 8 shows the concentration of the water control agent is 0.95g/cm2Water permeability test results under different hole radii;
FIG. 9 shows the concentration of the water control agent at 1.27g/cm2Water permeability test results under different hole radii;
FIG. 10 shows the concentration of the water control agent is 1.59g/cm2Water permeability test results under different hole radii;
FIG. 11 is a graph of the results of a water control agent oil/water permeability experiment;
FIG. 12 is a diagram showing the effect of the conductivity of the oil and water phases of the water control agent.
Detailed Description
The invention provides a high-permeability plugging, dredging, extracting and controlling comprehensive treatment method for a water cone entering shut-in well with a bottom, which comprises the following steps:
(1) carrying out nitrogen foam selective water plugging on a large water outlet channel along a high-permeability zone, wherein the crack angle of the high-permeability zone is 50-90 degrees;
(2) carrying out seismic crushing on the reservoir stratum of the high-permeability zone by using high-pressure supercritical carbon dioxide to realize hydrophobic diversion;
(3) exploiting the condensate oil gas by utilizing the characteristic of supercritical carbon dioxide;
(4) and controlling the water outlet of the low-water-bearing area by using a water control agent, wherein the water control agent comprises aggregate and a hydrophobic oleophilic gas film layer coated on the surface of the aggregate.
The invention carries out nitrogen foam selective water plugging on a large water outlet channel along a high-permeability zone, and the crack angle of the high-permeability zone is 50-90 degrees.
In the invention, the nitrogen foam is preferably composed of nitrogen, a surfactant (foaming agent) and active jelly (foam stabilizer), and the mass ratio of the nitrogen, the surfactant and the active jelly is preferably 2-3: 1-2: 7-5. In the invention, the nitrogen foam is a selective water shutoff agent and preferentially enters a stratum with high water saturation, can stably exist in the stratum with high water saturation, and cannot stably exist in the stratum with high oil and gas saturation; the nitrogen foam has excellent blocking ability, which increases with increasing permeability. The invention can effectively block the water invasion channel on the water body by using the nitrogen foam water plugging process and generating the high-strength foam water plugging layer for the active bottom water coning oil reservoir, and prevent the bottom water from coning along the high-seepage water channel again in the production process in the future.
In the present invention, the surfactant is preferably sodium lauryl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate, or sulfobetaine. In the invention, the surfactant is used as a foaming agent, so that the oil-water/gas-water interfacial tension can be greatly reduced, the wettability of the surface of the stratum rock is improved, and the oil gas in the original bound state is changed into movable oil gas.
In the invention, the active jelly preferably comprises active jelly comprising 0.5% of thickening agent, 0.3% of rheological additive, 0.2% of temperature regulator and 99% of clear water. In the invention, the active jelly has the function of foam stabilization.
The preparation method of the nitrogen foam is not particularly limited in the invention, and the nitrogen foam can be prepared by a preparation method well known to those skilled in the art.
In the present invention, since the bottom water occupies the oil gas flow passage, the nitrogen bubbles preferably completely block the bottom water coning passage, which has been flowing without the oil gas, while the nitrogen bubbles can be stably present for a long period of time.
After the selective water plugging is finished, the high-pressure supercritical carbon dioxide is used for carrying out seismic crushing on the reservoir stratum of the high-permeability zone, and the hydrophobic shunt is realized.
In the invention, the pumping pressure of the supercritical carbon dioxide is preferably 75-100 MPa during earthquake type crushing. In the invention, during earthquake-type crushing, the action range of the supercritical carbon dioxide is preferably within the range of 500-700 m above and below the reservoir. In the invention, rigid rock breaking is mainly performed on a main crack, water coning is fast, so that high water content is too early, high-pressure supercritical carbon dioxide is used for elastic rock breaking, a reservoir stratum is broken in an earthquake mode, a large number of crack networks are generated, the water coning of the main crack can be greatly shunted, so that the water content is reduced, meanwhile, the seepage speed of oil gas is greatly accelerated by the large-range crack networks in the stratum, and a considerable part of water entering the cone is restrained by the siphon effect generated by the crack networks.
In the invention, the degree of seismic fracture is preferably measured by a permeability improvement multiple, namely, the initial permeability is improved by 10-100 times, and the fracture is more complete when the value of the improvement multiple is larger.
After the earthquake type crushing is finished, the invention utilizes the characteristic of supercritical carbon dioxide to exploit the condensate oil gas.
In the invention, the pressure of the supercritical carbon dioxide is preferably 75-100 MPa when the condensate oil gas is produced. In the invention, the supercritical carbon dioxide has a weakened reverse condensation effect when used for exploiting condensate oil gas, when the supercritical carbon dioxide is used for exploiting condensate oil, the oil viscosity is reduced, the pressure is increased, the miscible phase yield of crude oil is increased, and meanwhile, the formation pressure can be supplemented; when the supercritical carbon dioxide is used for exploiting the condensate gas, the supercritical carbon dioxide can stabilize the pressure, enable the gas to expand, and slow down the condensate oil precipitation time when the inhibition pressure is lower than the critical pressure. Fig. 1 is a schematic diagram of the distribution state of condensate gas and condensate oil in a condensate gas well, and fig. 2 is a gas-liquid two-phase distribution diagram of an oil-gas reservoir under different temperatures and pressures.
The invention utilizes a water control agent to control the water outlet of a low water-bearing area, wherein the water control agent comprises aggregate and a hydrophobic oleophilic gas film layer coated on the surface of the aggregate. In the invention, the water control agent is a hydrophobic and hydrophilic material, in a fracturing crack, mutually communicated capillaries are formed between particles of the water control agent, when hydrocarbon and water simultaneously contact the water control agent, the hydrocarbon quickly infiltrates the water control agent, and the hydrocarbon is facilitated to pass through the water control agent; and water cannot infiltrate the water control agent, so that water is prevented from passing through the water control agent, the functions of promoting hydrocarbon permeation and controlling water permeation are realized, the recovery ratio is improved, and the water yield is reduced. Fig. 3 is a schematic diagram of a water control mechanism of the water control agent.
In the present invention, the low water content zone is preferably a zone having a water output contribution rate of less than 20%.
In the invention, the dosage of the water control agent is preferably 10-30 m3。
In the present invention, the aggregate preferably comprises quartz sand and/or ceramsite.
In the invention, the thickness of the hydrophobic and oleophilic membrane layer is preferably 10-12 μm.
In the present invention, the hydrophobic lipophilic film layer is preferably prepared from a compound comprising a structure represented by formula I:
the source of the compound with the structure shown in the formula I is not particularly limited, and the compound can be obtained from a commercial product of Beijing wonderful New Material Co.
In the invention, the water control rate of the water control agent is preferably not less than 90%, and the particle size is preferably 16-300 meshes.
In the invention, the density of the water control agent at 25 ℃ is preferably 0.6-1.6 g/cm3。
In the invention, after the comprehensive treatment method for plugging, dredging, mining and controlling is completed, mining is carried out.
For further illustration of the present invention, the method for comprehensive treatment of shut-in, dredging, production and control along high permeability bottoming water coning shut-in well provided by the present invention is described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Examples
1. Selectively blocking water and nitrogen foam water along a large water outlet channel of the high-permeability zone;
the crack angle of the high permeability zone is 50-90 deg.
For an active bottom water coning oil-gas reservoir, a nitrogen foam water plugging process is utilized to generate a high-strength foam water plugging layer, so that a water body upper invasion channel can be effectively plugged, and bottom water is prevented from coning along a high-permeability flow channel again in a production process in the future.
The nitrogen foam is composed of a dispersed phase (nitrogen), a foaming agent (surfactant) and a foam stabilizer (active jelly), wherein the mass ratio of the nitrogen to the surfactant to the active jelly is 2:1: 7.
Nitrogen foam is a selective water shutoff agent that preferentially enters formations with high water saturation.
The nitrogen foam can stably exist in the stratum with high water saturation, and cannot stably exist in the stratum with high oil saturation, and a schematic diagram of a foam blocking layer formed by the nitrogen foam is shown in FIG. 4.
2. High-pressure supercritical carbon dioxide earthquake type broken reservoir-drainage flow distribution
The pressure of the supercritical carbon dioxide is 75-100 MPa, and the action range of the supercritical carbon dioxide is 500-700 m above and below the reservoir.
Fig. 5 is a comparison graph of a fracture fractured in a conventional manner and a fracture formed in a high-pressure supercritical carbon dioxide earthquake-type fractured reservoir, and it can be seen that a single fracture is formed in the conventional technology and the modification volume is limited.
3. Supercritical carbon dioxide exploitation of condensate oil gas-weakening of reverse condensation effect
The pressure of the supercritical carbon dioxide is 75-100 MPa.
4. Water controlling agent for controlling water outlet-hydrocarbon affinity hydrophobicity of low water-bearing zone
The water control agent is a commercial product in the field.
The aggregate is quartz sand or ceramsite, and the thickness of the hydrophobic oleophilic gas film layer is 10-12 mu m.
The hydrophobic oleophilic membrane layer is prepared from a compound having a structure shown in formula I:
the compounds having the structure shown in formula I are available from kyotongqinoda new materials ltd.
FIG. 6 is a diagram of water control agent.
Table 1 shows the technical indexes of the water control agent, and table 2 shows the physical parameters of the water control agent.
Table 1 shows the technical specifications of water control agent
| Serial number | Item | Index (I) |
| 1 | Appearance of the product | Solid particles |
| 2 | Density at 25 ℃ in g/cm3 | 0.6～1.6 |
| 3 | Water control rate% | ≥90％ |
| 4 | Particle size (mesh) | 16～300 |
Table 2 shows physical parameters of water control agent
FIG. 7 shows the water permeability test results of water control agents with different concentrations at an aperture radius of 0.1mm, and FIG. 8 shows the water control agents at a concentration of 0.95g/cm2The water permeability test results under different hole radiuses, and figure 9 shows that the water control agent is inThe concentration is 1.27g/cm2The water permeability test results under different hole radii are shown in FIG. 10, which is the concentration of the water control agent is 1.59g/cm2The water permeability test results of the water control agent under different hole radiuses are shown in fig. 7-10, and the water control agent has hydrophobicity.
Table 3 shows the results of the oil penetration test of the water control agent, and it can be seen from table 3 that the water control agent of the present invention has lipophilicity. As can be seen from fig. 7 to 10 and table 3, the water control agent of the present invention is coated with a film made of a novel material, and the surface property of the film is changed from a high energy surface to a low energy surface, so that the water flow is blocked in a crack by an oil-wet surface, the oil flow is facilitated, and the dual functions of fracturing oil increment and blocking precipitation are provided.
TABLE 3 Water control agent oil penetration test results
Fig. 11 is a diagram of the results of the oil/water permeability experiment of the water control agent, and it can be seen that, at normal pressure, the liquid permeability of the oil phase of the water control agent is better than that of the water phase, the pressure difference is increased, and the increase range of the liquid permeability of the oil phase is much larger than that of the water phase. The flow conductivity ratio of the oil phase to the water phase is about 1.53: 1, the purposes of controlling water and increasing oil can be realized.
Fig. 12 is a graph showing the effect of the conductivity of the oil and water phases of the water control agent, and table 4 shows the data of the conductivity of the oil and water phases of the water control agent, from fig. 12 and table 4, it can be seen that the water control agent of the present invention has excellent water control oleophylic property, and the water control agent causes the wettability change, so that the capillary force direction is changed, and the hydrocarbon is changed into power, and the water is changed into resistance.
TABLE 4 Water control agent oil and water phase conductivity data results
Table 5 shows the effect data of water control using a common proppant, i.e., quartz sand, and table 6 shows the effect data of water control using the water control agent of the present invention.
Table 5 effect data for water control using common proppant-quartz sand
TABLE 6 Water control Effect data of the Water control agent of the present invention
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (7)
1. A comprehensive treatment method for plugging, dredging and controlling shut-in wells along a high-permeability bottoming water cone is characterized by comprising the following steps:
(1) carrying out nitrogen foam selective water plugging on a large water outlet channel along a high-permeability zone, wherein the crack angle of the high-permeability zone is 50-90 degrees;
(2) carrying out seismic crushing on the reservoir stratum of the high-permeability zone by using high-pressure supercritical carbon dioxide to realize hydrophobic diversion; during earthquake type crushing, the pumping pressure of the supercritical carbon dioxide is 75-100 MPa; the earthquake type crushing means that high-pressure supercritical carbon dioxide is used for elastically crushing rock, a reservoir stratum is crushed in an earthquake type manner, a large number of fracture networks are generated, and the water cone of a main fracture can be greatly shunted;
(3) the method for exploiting the condensate oil gas by utilizing the supercritical carbon dioxide characteristic comprises the following steps: after the earthquake type crushing is finished, exploiting the condensate oil gas by utilizing the characteristic of the supercritical carbon dioxide, and after the supercritical carbon dioxide is injected, the viscosity of the crude oil is reduced, the pressure is increased, the miscible phase yield of the crude oil is increased, and meanwhile, the formation pressure can be supplemented;
(4) controlling the water outlet of the low-water-content area by using a water control agent, wherein the water control agent comprises aggregate and a hydrophobic oleophilic gas film layer coated on the surface of the aggregate; the thickness of the hydrophobic oleophilic gas film layer is 10-12 mu m.
2. The comprehensive treatment method according to claim 1, wherein the nitrogen foam is composed of nitrogen, a surfactant and active jelly, and the mass ratio of the nitrogen to the surfactant to the active jelly is 2-3: 1-2: 7-5.
3. The integrated remediation method of claim 2 wherein the surfactant is sodium lauryl sulfate, sodium fatty alcohol-polyoxyethylene ether sulfate, or sulphobetaine.
4. The comprehensive treatment method according to claim 2, wherein the activated jelly comprises 0.5% of a thickening agent, 0.3% of a rheological aid, 0.2% of a temperature regulator and 99% of clear water.
5. The comprehensive treatment method according to claim 1, wherein when the condensate oil gas is produced by utilizing the characteristic of the supercritical carbon dioxide, the pumping pressure of the supercritical carbon dioxide is 75-100 MPa.
6. The integrated remediation method of claim 1 wherein the aggregate comprises quartz sand and/or ceramsite.
7. The comprehensive treatment method according to claim 1, wherein the water control rate of the water control agent is not less than 90%, and the particle size is 16-300 meshes.
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