CN111594096A - Underground ultrasonic vibration well cementation system and vibration well cementation method thereof - Google Patents
Underground ultrasonic vibration well cementation system and vibration well cementation method thereof Download PDFInfo
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- CN111594096A CN111594096A CN202010440855.1A CN202010440855A CN111594096A CN 111594096 A CN111594096 A CN 111594096A CN 202010440855 A CN202010440855 A CN 202010440855A CN 111594096 A CN111594096 A CN 111594096A
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- casing string
- well
- ultrasonic vibration
- centralizer
- oil
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
Abstract
The invention discloses an underground ultrasonic vibration well cementation system and a vibration well cementation method thereof, belonging to the field of oil and gas well engineering. This ultrasonic vibration well cementation system in pit includes: the device comprises a casing string, a centralizer, a seal isolation plate and a P-Raman generator, wherein the casing string can be put into a preset position of an oil-gas well, the centralizer is arranged on the casing string, the seal isolation plate is provided with the P-Raman generator which is symmetrically arranged in a ring shape; the ultrasonic vibration well cementation system is used for suppressing pressure by using a rubber plug and displacement fluid to force the rubber plug to move downwards, and the displacement fluid extrudes cement slurry which is injected into a casing string in advance; the extruded cement slurry flows through a contraction spray cavity and a nozzle of the Palman generator to generate ultrasonic vibration, and the multi-section Palman generator can generate long-distance high-frequency vibration to act on the whole well section casing string, the well wall and the cement slurry. The invention has simple design and lower processing cost, improves the vibration effect, cleans the mud cake of the cementing surface, shortens the initial and final setting time and further improves the well cementation quality.
Description
Technical Field
The invention relates to the field of oil and gas well engineering, in particular to an underground ultrasonic vibration well cementation system and a vibration well cementation method thereof.
Background
The well cementation is one of the most key parts in oil and gas exploitation engineering, and the excellent well cementation technology and process can improve the well cementation quality and prolong the service life of an oil and gas well. The filling gap can be reduced by applying vibration, mud cakes on a cementing surface are removed, the turbulent flow replacement effect is enhanced, annular gas channeling is inhibited, the cementing strength of a cement surface is improved, the cement gelling time is shortened, and the static shearing force of cement slurry is reduced or even eliminated, so that the cementing quality can be effectively improved through vibration cementing. However, the existing vibration cementing technology still has the problems of weak vibration strength and uneven vibration distribution. When the low-frequency hydraulic pulse type vibration cementing tool which is widely applied at present is used, the vibration frequency is low, the effect of ultrasonic high-frequency vibration is not obvious, the low-frequency hydraulic pulse type vibration cementing tool is usually arranged on a casing string close to the bottom of a well, the generated vibration is gradually weakened when being uploaded along the casing string, so that the remote vibration intensity in the casing string is weak, and the cementing quality is influenced. Therefore, a well cementing technique capable of realizing uniform distribution and generating high-frequency vibration in a long distance is urgently needed to overcome the defects in the prior art.
Disclosure of Invention
The invention aims to provide an underground ultrasonic vibration well cementation system and a vibration well cementation method thereof, wherein the underground ultrasonic vibration well cementation system comprises the following components: it is characterized in that the underground ultrasonic vibration well cementation system comprises: a casing string which can be put into a preset position of an oil-gas well can be put into the well, and an annular space is formed between the casing string and the wall of the oil-gas well; a centralizer is mounted on a casing string, a sealing ring which is self-expandable when encountering oil and water is mounted between the centralizer and the wall of an oil-gas well, a sealing isolation plate is mounted between the casing string and the centralizer, and a sealing isolation plate is mounted on every other casing string of the centralizer; the sealed isolation plate is provided with symmetrical Palman generators which are arranged in a ring shape; a sealing ring is arranged between the Palman generator and the sealing isolation plate; a rubber plug accommodated in the sleeve, and displacement liquid is injected on the rubber plug; the ultrasonic vibration well cementation system is pressed by using a rubber plug and displacement fluid to force the rubber plug to move downwards, and the displacement fluid extrudes cement slurry which is injected into a casing string in advance; the extruded cement slurry flows through a contraction spray cavity and a nozzle of the Palman generator to generate ultrasonic vibration, and the multi-section Palman generator can generate long-distance high-frequency vibration to act on the whole well section casing string, the well wall and the cement slurry.
The cement slurry used in the conventional well cementation process is injected into a casing string to meet the actual requirement.
And the sealing isolation plate, the casing string and the centralizer are tightly sealed by the sealing material which can self expand when meeting oil and water.
And oil-water self-expandable sealing materials are arranged between the centralizer and the casing string and between the centralizer and the well wall, so that the centralizer is strictly sealed.
And a sealing material which can automatically expand when meeting oil and water is arranged between the Palman generator and the sealing and isolating plate to ensure that the Palman generator is strictly sealed.
A vibration cementing method of an underground ultrasonic vibration cementing system comprises the following steps:
step 1, a casing string is lowered into a preset position in an oil-gas well, and an annular space is formed between the casing string and the inner wall of the oil-gas well;
step 2, injecting cement slurry meeting actual requirements into the casing string;
step 3, injecting a rubber plug into the casing string;
step 6, enabling the pressurized cement slurry to flow through the annular space to reach a contraction spraying cavity and a nozzle of the Palman generator to generate a high-pressure liquid sheet;
and 8, the multi-section Parlman generator generates long-distance high-frequency vibration to act on the casing string, the well wall and the cement paste of the whole well section.
The number of Palman generators arranged on each sealing isolation plate and the cross-sectional areas of the contraction spray cavity and the nozzle of each sealing isolation plate are determined according to the flow rate and the density of cement slurry in the annular space and the required ultrasonic vibration intensity.
The vibrating reed placed on the Palman generator is made of materials with high strength, good elasticity, high fatigue resistance and strong corrosion resistance, so that the 304 stainless steel is adopted to manufacture the wedge-shaped vibrating reed.
The hydraulic ultrasonic vibration well cementation method has the beneficial effects that the hydraulic ultrasonic vibration well cementation method is mainly used for vibration well cementation, can generate ultrasonic waves with certain intensity in the whole well section, and carries out ultrasonic treatment on cement paste to enable the cement paste to generate an ultrasonic stirring effect, so that cement particles are dispersed more uniformly, the hydration process of the cement paste is accelerated, the rheological property of the cement paste is improved, and the method plays an important role in guaranteeing the initial and final setting and the intensity development of the cement paste in an annular space and inhibiting the gas channeling of the annular space; the ultrasonic wave generated simultaneously has a strong cleaning function and can effectively clean the mud cake on the cemented surface, thereby further improving the cementing quality of cement slurry, the casing string and the well wall. The invention has simple design and lower processing cost, does not need to change the prior well cementation process, generates high-frequency vibration in a long distance, ensures uniform vibration distribution, improves the vibration effect, cleans the mud cake on the cementing surface, shortens the initial and final setting time and further improves the well cementation quality.
Drawings
FIG. 1 is a schematic diagram of a downhole ultrasonic vibration cementing system.
Figure 2 is an enlarged view of a portion of the installation centralizer in figure 1.
Fig. 3 is a schematic structural diagram of the palman generator.
The reference numbers in the figures are: 501-vibrating reed, 502-nozzle, 503-upper joint, 504-contraction spray cavity, 505-lower joint.
Detailed Description
The invention provides an underground ultrasonic vibration well cementation system and a vibration well cementation method thereof, wherein the vibration well cementation method comprises the following steps: the invention is further described below with reference to the accompanying drawings.
Referring to figure 1, a schematic diagram of a downhole ultrasonic vibration cementing system and a partial enlarged view of a centralizer-mounting portion of figure 2, there is shown a hydraulic ultrasonic vibration cementing system comprising a casing string 1 that can be lowered into a predetermined location in a hydrocarbon well; an annular space 13 is formed between the casing string 1 and the wall 12 of the oil and gas well; a1 # centralizer 3, a 2# centralizer 14 and a 3# centralizer 15 are sequentially arranged on a casing string 1 from top to bottom; a 2# Parlman generator 16 is arranged in the middle of the 3# centralizer 15; a sealing ring 7 which automatically expands when the well wall meets oil and water is arranged between the 1# centralizer 3 and the well wall 12 of the oil and gas well; an oil-water self-expansion sealing ring 2 is arranged between the 1# centralizer 3 and the casing string 1; a sealing and isolating plate 6 is arranged between the casing 1 and the 1# centralizer 3; the sealed isolation plate 6 is provided with a 1# Palman generator 5 which is symmetrically and annularly arranged; a sealing ring 11 is arranged between the 1# Parlman generator 5 and the sealing isolation plate 6; a rubber plug 10 accommodated in the casing 1; the upper sleeve 1 of the rubber plug 10 is internally provided with displacement liquid 4; a sleeve pipe oil-water self-expansion sealing ring 8 is arranged between the middle sealing isolation plate 6 of the 1# centralizer 3 and the sleeve pipe 1; the cement slurry 9 is forced to flow through the 1# palman generator 5 causing ultrasonic vibrations which act on the casing 1, the borehole wall 12 and the cement slurry 9.
Fig. 3 is a schematic diagram of the palman generator. The vibrating reed 501 is vertically fixed on the top end of an upper joint 503, the lower end of the vibrating reed 501 is opposite to the nozzle 502, a lower joint 505 is inserted into and fixed in the inner cavity of the upper joint 503, the inner cavity of the lower joint 505 is a pointed tower-shaped contracted spraying cavity 504, and the through hole on the top end of the pointed tower-shaped contracted spraying cavity 504 is the nozzle 502.
The ultrasonic vibration well cementation system is pressed by using a rubber plug and displacement fluid to force the rubber plug to move downwards, and the displacement fluid extrudes cement slurry which is injected into a casing string in advance; the extruded cement slurry flows through a contraction spray cavity and a nozzle of the Palman generator to generate ultrasonic vibration, and the multi-section Palman generator can generate long-distance high-frequency vibration to act on the whole well section casing string, the well wall and the cement slurry.
The cement slurry in the structure is the cement slurry used in the conventional well cementation process, and the cement is injected into the casing string to achieve the actual requirement. And the sealing isolation plate, the casing string and the centralizer are tightly sealed by the sealing material which can self expand when meeting oil and water. And oil-water self-expandable sealing materials are arranged between the centralizer and the casing string and between the centralizer and the well wall, so that the centralizer is strictly sealed. And a sealing material which can automatically expand when meeting oil and water is arranged between the Palman generator and the sealing and isolating plate to ensure that the Palman generator is strictly sealed.
A vibration cementing method of an underground ultrasonic vibration cementing system comprises the following steps:
step 1, a casing string 1 is lowered to a preset position in an oil-gas well, and an annular space 13 is formed between the casing string and the inner wall of the oil-gas well;
step 2, injecting cement slurry 9 meeting actual requirements into the casing string;
step 3, injecting a rubber plug 10 into the casing string;
step 6, enabling the pressurized cement slurry to flow through the annular space to reach a contraction spraying cavity and a nozzle of the Palman generator to generate a high-pressure liquid sheet;
and 8, the multi-section Parlman generator generates long-distance high-frequency vibration to act on the casing string, the well wall and the cement paste of the whole well section.
The number of Palman generators arranged on each sealing isolation plate and the cross-sectional areas of the contraction spray cavity and the nozzle of each sealing isolation plate are determined according to the flow rate and the density of cement slurry in the annular space and the required ultrasonic vibration intensity.
The 304 stainless steel wedge-shaped vibration reed placed on the Palman generator is not limited to the vibration reed, and the material of the vibration reed is high in required strength, good in elasticity, high in fatigue resistance and strong in corrosion resistance.
In the implementation method, ultrasonic waves with certain intensity are generated by an underground hydraulic ultrasonic generating device, namely a Palman generator, and the cement slurry is subjected to ultrasonic treatment, so that the cement slurry generates an ultrasonic stirring effect, cement particles are dispersed more uniformly, the hydration process of the cement slurry is accelerated, the rheological property of the cement slurry is improved, and an important guarantee effect is played on the aspects of initial and final setting, strength development and annular air channeling inhibition of the cement slurry in an annular space; because the attenuation of ultrasonic wave is fast, need install palman generator (as shown in figure 1) on every other centralizer, make the vibration of grout in the annular space more even, strong, realize long distance high frequency vibration, make grout all can produce the ultrasonic wave stirring effect in whole annular space, the ultrasonic wave that produces simultaneously still has very strong cleaning function, can effectively clean cemented surface mud cake to further improve the cementation quality of grout and casing string and wall of a well.
Claims (8)
1. A downhole ultrasonic vibration cementing system: it is characterized in that the underground ultrasonic vibration well cementation system comprises: a casing string which can be put into a preset position of an oil-gas well can be put into the well, and an annular space is formed between the casing string and the wall of the oil-gas well; a centralizer is mounted on a casing string, a sealing ring which is self-expandable when encountering oil and water is mounted between the centralizer and the wall of an oil-gas well, a sealing isolation plate is mounted between the casing string and the centralizer, and a sealing isolation plate is mounted on every other casing string of the centralizer; the sealed isolation plate is provided with symmetrical Palman generators which are arranged in a ring shape; a sealing ring is arranged between the Palman generator and the sealing isolation plate; a rubber plug accommodated in the sleeve, and displacement liquid is injected on the rubber plug; the ultrasonic vibration well cementation system is pressed by using a rubber plug and displacement fluid to force the rubber plug to move downwards, and the displacement fluid extrudes cement slurry which is injected into a casing string in advance; the extruded cement slurry flows through a contraction spray cavity and a nozzle of the Palman generator to generate ultrasonic vibration, and the multi-section Palman generator can generate long-distance high-frequency vibration to act on the whole well section casing string, the well wall and the cement slurry.
2. The downhole ultrasonic vibration cementing system according to claim 1: the cement slurry is characterized by being used in a conventional well cementation process.
3. The downhole ultrasonic vibration cementing system according to claim 1: the sealing isolation plate is characterized in that a sealing material which can self expand when meeting oil and water is arranged between the sealing isolation plate and the casing string and between the sealing isolation plate and the centralizer, so that the sealing isolation plate and the casing string and the centralizer are strictly sealed.
4. The downhole ultrasonic vibration cementing system according to claim 1: the centralizer is characterized in that a sealing material which can self-expand when meeting oil and water is arranged between the centralizer and the casing string and between the centralizer and the well wall, so that the centralizer is strictly sealed.
5. The downhole ultrasonic vibration cementing system according to claim 1: the sealed oil-water self-expanding plastic pipe is characterized in that a sealing material which can automatically expand when meeting oil and water is arranged between the Palman generator and the sealed isolation plate to ensure that the sealed oil-water self-expanding plastic pipe is strictly sealed.
6. A method of vibratory cementing in a downhole ultrasonic vibratory cementing system as defined in claim 1, comprising the steps of:
step 1, a casing string is lowered into a preset position in an oil-gas well, and an annular space is formed between the casing string and the inner wall of the oil-gas well;
step 2, injecting cement slurry meeting actual requirements into the casing string;
step 3, injecting a rubber plug into the casing string;
step 4, injecting displacement liquid meeting the actual requirements into the casing string;
step 5, pressing the rubber plug by the displacement liquid to move the cement paste;
step 6, enabling the pressurized cement slurry to flow through the annular space to reach a contraction spraying cavity and a nozzle of the Palman generator to generate a high-pressure liquid sheet;
step 7, the high-pressure liquid sheet impacts a reed of the Palman generator to enable the reed to generate ultrasonic vibration; the ultrasonic vibration will be transmitted to the surrounding casing string, well wall and cement slurry;
and 8, the multi-section Parlman generator generates long-distance high-frequency vibration to act on the casing string, the well wall and the cement paste of the whole well section.
7. The method of claim 6, wherein the number of Palman generators and the size of the cross-sectional area of the convergent-divergent cavity and the nozzle are determined according to the flow rate and density of the cement slurry in the annular space and the required intensity of the ultrasonic vibration.
8. The vibration cementing method of the downhole ultrasonic vibration cementing system according to claim 6, wherein the vibration reed placed on the Palman generator is made of a material with high strength, good elasticity, high fatigue resistance and strong corrosion resistance; therefore, 304 stainless steel is used to make the wedge-shaped vibrating reed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114183077A (en) * | 2021-12-01 | 2022-03-15 | 中国海洋石油集团有限公司 | Downhole hydraulic vibration-assisted casing running and well cementation integrated combined tool and use method thereof |
| CN114961565A (en) * | 2022-06-07 | 2022-08-30 | 中国农业大学 | Surface casing running and vibrating well cementation method and test device thereof |
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| CN114183077A (en) * | 2021-12-01 | 2022-03-15 | 中国海洋石油集团有限公司 | Downhole hydraulic vibration-assisted casing running and well cementation integrated combined tool and use method thereof |
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| CN114961565A (en) * | 2022-06-07 | 2022-08-30 | 中国农业大学 | Surface casing running and vibrating well cementation method and test device thereof |
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