CN211448593U - Suitable for CO2Huff-puff injection-production integrated wellhead device - Google Patents
Suitable for CO2Huff-puff injection-production integrated wellhead device Download PDFInfo
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- CN211448593U CN211448593U CN201921901523.8U CN201921901523U CN211448593U CN 211448593 U CN211448593 U CN 211448593U CN 201921901523 U CN201921901523 U CN 201921901523U CN 211448593 U CN211448593 U CN 211448593U
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Abstract
The utility model discloses a suitable CO2The integrated well head device for huff and puff injection and production comprises a sucker rod hanger, a sucker rod blowout prevention gate, an outer delivery edge connecting pipeline, two oil pipe gates, two sleeve pipe gates, a large cross joint and a small cross joint, wherein the lower end of the large cross joint is connected with a shaft, the upper end of the large cross joint is connected with the lower end of the small cross joint through an oil pipe, the sucker rod blowout prevention gate is arranged in the middle of the oil pipe, the upper end of the small cross joint is connected with the sucker rod hanger,the sucker rod can be hung on a sucker rod hanger, two sides of the large cross joint are respectively connected with a casing pipe gate, two sides of the small cross joint are respectively connected with an oil pipe gate, and the outer side of the oil pipe gate is connected with CO2And injecting the pipeline, wherein the outer side of the other oil pipe gate is connected with an outer delivery side connecting pipeline.
Description
Technical Field
The utility model belongs to the technical field of oil field development oil recovery, especially, relate to a be suitable for CO2A wellhead device integrating huff and puff injection and production.
Background
With the development of oil fields, the grade of newly added reserves of domestic oil fields is gradually deteriorated year by year, the water injection of ultra-low permeability/ultra-low permeability oil reservoirs is difficult, the profile contradiction is prominent, and the recovery ratio is low. A great deal of research and practice at home and abroad shows that CO is injected2The volume of the crude oil can be increased, the viscosity is reduced, and the light hydrocarbons of the crude oil are extracted, so that the saturation of the residual oil is obviously reduced, and the profile conflict is improved. Thus, CO2The huff and puff is a new technology which can improve the recovery ratio and achieve the aim of carbon emission reduction.
CO2The throughput is to take a certain amount of liquid CO2Injecting the mixture under certain injection pressure to a target layer to supplement stratum energy, and stewing for 20-30 days to ensure that the injected carbon dioxide and oil reservoir fluid are subjected to well opening production in a miscible or near-miscible state. So that the huff-and-puff well is also an injection wellIn the oil production well, the wellhead not only needs to meet the injection condition, but also needs to meet the production condition.
At present, the oil production wells all adopt simple well mouths, the structure is simple, the pressure is generally 14MPa, and the well control cannot be controlled in the process of exploitation.
On one hand, the height of a well head of a standard oil extraction well head on the market at present exceeds 0.95m, and for a non-foundation oil pumping unit, the oil pumping unit is easy to collide with the well head during normal production; on the other hand, the injection of CO into the immobile pipe column cannot be realized2The requirements of (1).
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a CO-free gas generator2The integrated wellhead assembly of huff and puff injection and production overcomes the defects of 1: the simple wellhead has a simple structure, the pressure is generally 14MPa, and well control cannot be controlled in the process of mining; 2: the height of a well mouth of the existing standard oil extraction well mouth exceeds 0.95m, and for a foundation-free oil pumping unit, the oil pumping unit and the well mouth are easy to collide during normal production; 3: the existing standard oil extraction well head can not realize the injection of CO into the immobile pipe column2The requirements of the components and the like.
In order to solve the technical problem, the technical scheme of the utility model is that: suitable for CO2The integrated well head device of injection and production comprises a sucker rod hanger, a sucker rod blowout prevention gate, an outer delivery edge connecting pipeline, two oil pipe gates, two sleeve pipe gates, a large cross joint and a small cross joint, wherein the lower end of the large cross joint is connected with a shaft, the upper end of the large cross joint is connected with the lower end of the small cross joint through an oil pipe, the sucker rod blowout prevention gate is arranged in the middle of the oil pipe, the upper end of the small cross joint is connected with the sucker rod hanger, a sucker rod can be hung on the sucker rod hanger, the two sides of the large cross joint are respectively connected with one sleeve pipe gate, the two sides of the small cross joint are respectively connected with one2And injecting the pipeline, wherein the outer side of the other oil pipe gate is connected with an outer delivery side connecting pipeline.
Preferably, a pressure gauge and a high-pressure stop valve are arranged between the oil pipe gate and the external conveying side connecting pipeline, the pressure gauge is used for reflecting pressure change of a wellhead, and the high-pressure stop valve is used for timely stopping to protect the external conveying side connecting pipeline.
Preferably, a constant pressure air release valve is arranged on the outer side of the casing valve, sleeve pressure is controlled through the constant pressure air release valve, and the pressure of the shaft is adjusted.
Preferably, the upper end of the large cross joint is provided with an upper flange, the upper flange connects the oil pipe with the upper end of the large cross joint, the lower end of the large cross joint is provided with a lower flange, the lower flange connects the casing buckle with the lower end of the large cross joint, the casing buckle is connected with the casing head in a matched mode, and the casing head is arranged inside the shaft.
Preferably, the sucker rod blowout preventer gate comprises a first gate and a second gate, wherein the first gate and the second gate are arranged at the middle position of the oil pipe relatively, the first gate and the second gate each comprise a manual gate, a handle, a housing and an annular sealing member, the manual gate is connected with the handle, the handle penetrates through the housing to be connected with the annular sealing member, the annular sealing member is arranged inside the housing, and the annular sealing member can move left and right through the rotation of the manual gate so as to open/close an annular space between the sucker rod and the oil pipe.
Preferably, the annular sealing member includes rubber seal ring and spring, and wherein the rubber seal ring is semi-circular structure, and wherein rubber seal ring inside is equipped with a plurality of springs, can open the annular space between sucker rod and the oil pipe when two semi-circular structure's that set up relatively rubber seal ring contact, wherein two semi-circular structure's that set up relatively rubber seal ring keeps away from the annular space between sucker rod and the oil pipe.
Preferably, the springs are uniformly arranged inside the rubber sealing rings along the circumferential direction of the radial direction of the oil pipe, and 4-8 springs are arranged inside one of the rubber sealing rings.
Preferably, the sucker rod hanger is a round cover structure consisting of an upper part and a lower part, wherein the inner wall of the lower part of the sucker rod hanger is provided with a thread which can be connected with the upper end of a small four-way joint, the center of the upper part of the sucker rod hanger is provided with a through hole, the inner wall of the through hole is provided with a thread, and the top of the sucker rod can be hung on the sucker rod hanger through the thread of the inner wall of the through hole.
Preferably, the integral height of the wellhead device is less than or equal to 950mm, and the pressure bearing capacity of the wellhead device is more than or equal to 21 MPa.
Compared with the prior art, the utility model has the advantages of:
(1) the utility model discloses the wellhead assembly is equipped with sucker rod hanger, CO2Before injection, the production pipe column can be put into the well, and the sucker rod is hung on the sucker rod hanger, so that CO can be injected positively without moving the pipe column2The utility model relates to a CO2The huff and puff well head is safe and reliable, and the injection and production integration is realized;
(2) the oil production wellhead of the wellhead device of the utility model has the bearing pressure of more than or equal to 21MPa, the whole height of the wellhead device is less than or equal to 950mm, compared with the original oil production wellhead, the pressure grade is improved by one level, the high pressure injection requirement is met, the height of the wellhead is reduced, and the sucker rod blowout prevention gate is arranged in the wellhead device, so that the wellhead can be controlled emergently when special accidents such as underground blowout and the like occur;
(3) the utility model discloses the design has the high-pressure stop valve between oil pipe gate high pressure and outer defeated limit connects the pipeline low pressure, because the outer defeated limit connects the highest operating pressure of pipeline to be 4MPa, consequently need cut when exceeding 3MPa, protects outer defeated limit and connects the pipeline, the utility model discloses be fit for CO2The oil production well without the basic oil pumping unit is adopted, namely the oil production well with the limitation on the height of the well mouth.
Drawings
FIG. 1 shows that the utility model is suitable for CO2The structure schematic diagram of the huff-puff injection-production integrated wellhead device;
FIG. 2 shows that the utility model is suitable for CO2The structure schematic diagram of the pumping rod blowout prevention gate of the huff-puff injection-production integrated well head device;
FIG. 3 shows that the utility model is suitable for CO2The structure of the annular sealing element of the huff-puff injection-production integrated wellhead device is schematically shown.
Description of reference numerals:
1. the device comprises a sucker rod hanger, 2, a pressure gauge, 3, a high-pressure stop valve, 4, a sucker rod blowout prevention gate, 5, an external transmission side connecting pipeline, 6, a constant-pressure air release valve, 7, an oil pipe gate, 8, a sleeve gate, 9, a lower flange, 10, a sucker rod, 11, a large four-way, 12, a small four-way, 13, a sleeve buckle, 14, a sleeve head, 15, a shaft, 16, an oil pipe, 17 and an upper flange;
4-1, a manual gate, 4-2, a handle, 4-3, a shell, 4-4 and an annular sealing element;
4-4-1, a rubber sealing ring, 4-4-2 and a spring.
Detailed Description
The following description of the embodiments of the present invention is provided in connection with the following embodiments:
it should be noted that the structures, ratios, sizes, etc. illustrated in the present specification are only used to cooperate with the contents disclosed in the specification for the understanding and reading of the people skilled in the art, and are not used to limit the limit conditions that the present invention can be implemented, and any modifications of the structures, changes of the ratio relationships or adjustments of the sizes should still fall within the scope that the technical contents disclosed in the present invention can cover without affecting the functions and the achievable purposes of the present invention.
Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof may be made without substantial technical changes, and the present invention is also regarded as the scope of the present invention.
Example 1
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of huff and puff, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein big cross 11 lower extreme connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, little cross 12 upper end connects sucker rod hanger 1, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, whereinTwo sides of the small cross joint 12 are respectively connected with an oil pipe gate 7, and the outer side of the oil pipe gate 7 is connected with CO2And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Example 2
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of taking in and sending out, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein the lower extreme of big cross 11 connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein the oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to the upper end of little cross 12, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to little cross 12 both sides, the CO gate 7 outside connection CO of an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Example 3
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of taking in and sending out, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein the lower extreme of big cross 11 connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein the oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to the upper end of little cross 12, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to little cross 12 both sides, the CO gate 7 outside connection CO of an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Preferably, as shown in fig. 1, a constant pressure air release valve 6 is arranged outside the casing gate 8, and the casing pressure is controlled by the constant pressure air release valve 6 to adjust the pressure of the shaft 15.
Example 4
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of taking in and sending out, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein the lower extreme of big cross 11 connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein the oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to the upper end of little cross 12, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to little cross 12 both sides, the CO gate 7 outside connection CO of an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Preferably, as shown in fig. 1, a constant pressure air release valve 6 is arranged outside the casing gate 8, and the casing pressure is controlled by the constant pressure air release valve 6 to adjust the pressure of the shaft 15.
Preferably, as shown in fig. 1, an upper flange 17 is provided at the upper end of the large four-way 11, wherein the upper flange 17 connects the oil pipe 16 with the upper end of the large four-way 11, a lower flange 9 is provided at the lower end of the large four-way 11, wherein the lower flange 9 connects the casing buckle 13 with the lower end of the large four-way 11, the casing buckle 13 is connected with the casing head 14 in a matching manner, and the casing head 14 is provided inside the wellbore 15.
Example 5
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of taking in and sending out, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein the lower extreme of big cross 11 connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein the oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to the upper end of little cross 12, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to little cross 12 both sides, the CO gate 7 outside connection CO of an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Preferably, as shown in fig. 1, a constant pressure air release valve 6 is arranged outside the casing gate 8, and the casing pressure is controlled by the constant pressure air release valve 6 to adjust the pressure of the shaft 15.
Preferably, as shown in fig. 1, an upper flange 17 is provided at the upper end of the large four-way 11, wherein the upper flange 17 connects the oil pipe 16 with the upper end of the large four-way 11, a lower flange 9 is provided at the lower end of the large four-way 11, wherein the lower flange 9 connects the casing buckle 13 with the lower end of the large four-way 11, the casing buckle 13 is connected with the casing head 14 in a matching manner, and the casing head 14 is provided inside the wellbore 15.
Preferably, as shown in FIG. 2, the sucker rod blowout preventer gate 4 comprises a first gate and a second gate, wherein the first gate and the second gate are oppositely disposed at the middle position of the oil pipe 16, the first gate and the second gate each comprise a manual gate 4-1, a handle 4-2, a housing 4-3 and an annular seal 4-4, wherein the manual gate 4-1 is connected with the handle 4-2, wherein the handle 4-2 passes through the housing 4-3 to be connected with the annular seal 4-4, and the annular seal 4-4 is disposed inside the housing 4-3, wherein the annular seal 4-4 can be moved left and right by the rotation of the manual gate 4-1 to open/close the annular space between the sucker rod 10 and the oil pipe 16.
Example 6
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of taking in and sending out, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein the lower extreme of big cross 11 connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein the oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to the upper end of little cross 12, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to little cross 12 both sides, the CO gate 7 outside connection CO of an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Preferably, as shown in fig. 1, a constant pressure air release valve 6 is arranged outside the casing gate 8, and the casing pressure is controlled by the constant pressure air release valve 6 to adjust the pressure of the shaft 15.
Preferably, as shown in fig. 1, an upper flange 17 is provided at the upper end of the large four-way 11, wherein the upper flange 17 connects the oil pipe 16 with the upper end of the large four-way 11, a lower flange 9 is provided at the lower end of the large four-way 11, wherein the lower flange 9 connects the casing buckle 13 with the lower end of the large four-way 11, the casing buckle 13 is connected with the casing head 14 in a matching manner, and the casing head 14 is provided inside the wellbore 15.
Preferably, as shown in FIG. 2, the sucker rod blowout preventer gate 4 comprises a first gate and a second gate, wherein the first gate and the second gate are oppositely disposed at the middle position of the oil pipe 16, the first gate and the second gate each comprise a manual gate 4-1, a handle 4-2, a housing 4-3 and an annular seal 4-4, wherein the manual gate 4-1 is connected with the handle 4-2, wherein the handle 4-2 passes through the housing 4-3 to be connected with the annular seal 4-4, and the annular seal 4-4 is disposed inside the housing 4-3, wherein the annular seal 4-4 can be moved left and right by the rotation of the manual gate 4-1 to open/close the annular space between the sucker rod 10 and the oil pipe 16.
Preferably, as shown in fig. 3, the annular sealing element 4-4 comprises a rubber sealing ring 4-4-1 and a spring 4-4-2, wherein the rubber sealing ring 4-4-1 is of a semicircular structure, wherein the rubber sealing ring 4-4-1 is internally provided with a plurality of springs 4-4-2, the annular space between the sucker rod 10 and the oil pipe 16 can be sealed off when the two opposite semicircular rubber sealing rings 4-4-1 are in contact, and the annular space between the sucker rod 10 and the oil pipe 16 can be opened when the two opposite semicircular rubber sealing rings 4-4-1 are far away.
Example 7
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of taking in and sending out, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein the lower extreme of big cross 11 connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein the oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to the upper end of little cross 12, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to little cross 12 both sides, the CO gate 7 outside connection CO of an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Preferably, as shown in fig. 1, a constant pressure air release valve 6 is arranged outside the casing gate 8, and the casing pressure is controlled by the constant pressure air release valve 6 to adjust the pressure of the shaft 15.
Preferably, as shown in fig. 1, an upper flange 17 is provided at the upper end of the large four-way 11, wherein the upper flange 17 connects the oil pipe 16 with the upper end of the large four-way 11, a lower flange 9 is provided at the lower end of the large four-way 11, wherein the lower flange 9 connects the casing buckle 13 with the lower end of the large four-way 11, the casing buckle 13 is connected with the casing head 14 in a matching manner, and the casing head 14 is provided inside the wellbore 15.
Preferably, as shown in FIG. 2, the sucker rod blowout preventer gate 4 comprises a first gate and a second gate, wherein the first gate and the second gate are oppositely disposed at the middle position of the oil pipe 16, the first gate and the second gate each comprise a manual gate 4-1, a handle 4-2, a housing 4-3 and an annular seal 4-4, wherein the manual gate 4-1 is connected with the handle 4-2, wherein the handle 4-2 passes through the housing 4-3 to be connected with the annular seal 4-4, and the annular seal 4-4 is disposed inside the housing 4-3, wherein the annular seal 4-4 can be moved left and right by the rotation of the manual gate 4-1 to open/close the annular space between the sucker rod 10 and the oil pipe 16.
Preferably, as shown in fig. 3, the annular sealing element 4-4 comprises a rubber sealing ring 4-4-1 and a spring 4-4-2, wherein the rubber sealing ring 4-4-1 is of a semicircular structure, wherein the rubber sealing ring 4-4-1 is internally provided with a plurality of springs 4-4-2, the annular space between the sucker rod 10 and the oil pipe 16 can be sealed off when the two opposite semicircular rubber sealing rings 4-4-1 are in contact, and the annular space between the sucker rod 10 and the oil pipe 16 can be opened when the two opposite semicircular rubber sealing rings 4-4-1 are far away.
Preferably, as shown in fig. 3, the springs 4-4-2 are circumferentially and uniformly arranged inside the rubber sealing rings 4-4-1 along the radial direction of the oil pipe 16, wherein 4-8 springs 4-4-2 are arranged inside one rubber sealing ring 4-4-1.
Example 8
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device for huff and puff injection and production comprises a sucker rodHanger 1, sucker rod blowout prevention gate 4, outer delivery edge connecting pipeline 5, two tubing gates 7, two casing valves 8, big cross 11 and small cross 12, wherein pit shaft 15 is connected to big cross 11 lower extreme, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of small cross 12, wherein oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to small cross 12 upper end, wherein sucker rod 10 can hang on sucker rod hanger 1, a casing valve 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to small cross 12 both sides, CO gate 7 outside connection CO is connected to an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Preferably, as shown in fig. 1, a constant pressure air release valve 6 is arranged outside the casing gate 8, and the casing pressure is controlled by the constant pressure air release valve 6 to adjust the pressure of the shaft 15.
Preferably, as shown in fig. 1, an upper flange 17 is provided at the upper end of the large four-way 11, wherein the upper flange 17 connects the oil pipe 16 with the upper end of the large four-way 11, a lower flange 9 is provided at the lower end of the large four-way 11, wherein the lower flange 9 connects the casing buckle 13 with the lower end of the large four-way 11, the casing buckle 13 is connected with the casing head 14 in a matching manner, and the casing head 14 is provided inside the wellbore 15.
Preferably, as shown in FIG. 2, the sucker rod blowout preventer gate 4 comprises a first gate and a second gate, wherein the first gate and the second gate are oppositely disposed at the middle position of the oil pipe 16, the first gate and the second gate each comprise a manual gate 4-1, a handle 4-2, a housing 4-3 and an annular seal 4-4, wherein the manual gate 4-1 is connected with the handle 4-2, wherein the handle 4-2 passes through the housing 4-3 to be connected with the annular seal 4-4, and the annular seal 4-4 is disposed inside the housing 4-3, wherein the annular seal 4-4 can be moved left and right by the rotation of the manual gate 4-1 to open/close the annular space between the sucker rod 10 and the oil pipe 16.
Preferably, as shown in fig. 3, the annular sealing element 4-4 comprises a rubber sealing ring 4-4-1 and a spring 4-4-2, wherein the rubber sealing ring 4-4-1 is of a semicircular structure, wherein the rubber sealing ring 4-4-1 is internally provided with a plurality of springs 4-4-2, the annular space between the sucker rod 10 and the oil pipe 16 can be sealed off when the two opposite semicircular rubber sealing rings 4-4-1 are in contact, and the annular space between the sucker rod 10 and the oil pipe 16 can be opened when the two opposite semicircular rubber sealing rings 4-4-1 are far away.
Preferably, as shown in fig. 3, the springs 4-4-2 are circumferentially and uniformly arranged inside the rubber sealing rings 4-4-1 along the radial direction of the oil pipe 16, wherein 4-8 springs 4-4-2 are arranged inside one rubber sealing ring 4-4-1.
Preferably, as shown in fig. 1, the sucker rod hanger 1 is a round cap structure composed of an upper portion and a lower portion, wherein the inner wall of the lower portion of the sucker rod hanger 1 is provided with a thread connectable upper end of the small cross 12, the center of the upper portion of the sucker rod hanger 1 is provided with a through hole, wherein the inner wall of the through hole is provided with a thread, and wherein the top of the sucker rod 10 can be hung on the sucker rod hanger 1 through the thread of the inner wall of the through hole.
Example 9
As shown in figure 1, the utility model discloses a suitable CO2The integrated well head device of injection and production of taking in and sending out, including sucker rod hanger 1, sucker rod blowout prevention gate 4, outer defeated edge connects pipeline 5, two oil pipe gates 7, two sleeve pipe gates 8, big cross 11 and little cross 12, wherein the lower extreme of big cross 11 connects pit shaft 15, big cross 11 upper end passes through oil pipe 16 and connects the lower extreme of little cross 12, wherein the oil pipe 16 intermediate position is equipped with sucker rod blowout prevention gate 4, sucker rod hanger 1 is connected to the upper end of little cross 12, wherein sucker rod 10 can hang on sucker rod hanger 1, a sleeve pipe gate 8 is connected respectively to big cross 11 both sides, wherein an oil pipe gate 7 is connected respectively to little cross 12 both sides, the CO gate 7 outside connection CO of an oil pipe gate 72And the outer side of the other oil pipe gate 7 is connected with the outer conveying side connecting pipeline 5.
Preferably, as shown in fig. 1, a pressure gauge 2 and a high-pressure stop valve 3 are arranged between the oil pipe gate 7 and the external input side connecting pipeline 5, the pressure gauge 2 is used for reflecting pressure change of a wellhead, and the high-pressure stop valve 3 is used for timely stopping to protect the external input side connecting pipeline 5.
Preferably, as shown in fig. 1, a constant pressure air release valve 6 is arranged outside the casing gate 8, and the casing pressure is controlled by the constant pressure air release valve 6 to adjust the pressure of the shaft 15.
Preferably, as shown in fig. 1, an upper flange 17 is provided at the upper end of the large four-way 11, wherein the upper flange 17 connects the oil pipe 16 with the upper end of the large four-way 11, a lower flange 9 is provided at the lower end of the large four-way 11, wherein the lower flange 9 connects the casing buckle 13 with the lower end of the large four-way 11, the casing buckle 13 is connected with the casing head 14 in a matching manner, and the casing head 14 is provided inside the wellbore 15.
Preferably, as shown in FIG. 2, the sucker rod blowout preventer gate 4 comprises a first gate and a second gate, wherein the first gate and the second gate are oppositely disposed at the middle position of the oil pipe 16, the first gate and the second gate each comprise a manual gate 4-1, a handle 4-2, a housing 4-3 and an annular seal 4-4, wherein the manual gate 4-1 is connected with the handle 4-2, wherein the handle 4-2 passes through the housing 4-3 to be connected with the annular seal 4-4, and the annular seal 4-4 is disposed inside the housing 4-3, wherein the annular seal 4-4 can be moved left and right by the rotation of the manual gate 4-1 to open/close the annular space between the sucker rod 10 and the oil pipe 16.
Preferably, as shown in fig. 3, the annular sealing element 4-4 comprises a rubber sealing ring 4-4-1 and a spring 4-4-2, wherein the rubber sealing ring 4-4-1 is of a semicircular structure, wherein the rubber sealing ring 4-4-1 is internally provided with a plurality of springs 4-4-2, the annular space between the sucker rod 10 and the oil pipe 16 can be sealed off when the two opposite semicircular rubber sealing rings 4-4-1 are in contact, and the annular space between the sucker rod 10 and the oil pipe 16 can be opened when the two opposite semicircular rubber sealing rings 4-4-1 are far away.
Preferably, as shown in fig. 3, the springs 4-4-2 are circumferentially and uniformly arranged inside the rubber sealing rings 4-4-1 along the radial direction of the oil pipe 16, wherein 4-8 springs 4-4-2 are arranged inside one rubber sealing ring 4-4-1.
As shown in figure 3, when the two semicircular rubber sealing rings 4-4-1 are contacted with each other, the oil pipe 16 is extruded, the rubber sealing ring 4-4-1 is subjected to a force along the radial direction of the oil pipe 16 (as shown by an arrow in figure 3), and the spring 4-4-2 is also arranged according to the stress direction, so that the deformation amount of the rubber sealing ring 4-4-1 is increased, and the plugging effect is improved.
Preferably, as shown in fig. 1, the sucker rod hanger 1 is a round cap structure composed of an upper portion and a lower portion, wherein the inner wall of the lower portion of the sucker rod hanger 1 is provided with a thread connectable upper end of the small cross 12, the center of the upper portion of the sucker rod hanger 1 is provided with a through hole, wherein the inner wall of the through hole is provided with a thread, and wherein the top of the sucker rod 10 can be hung on the sucker rod hanger 1 through the thread of the inner wall of the through hole.
Preferably, the integral height of the wellhead device is less than or equal to 950mm, and the pressure bearing capacity of the wellhead device is more than or equal to 21 MPa.
Preferably, a suitable CO as described in any of the above2The using method of the huff-puff injection-production integrated wellhead device comprises the following steps:
step 1) when CO is required2At the time of injection, opening with CO2Injecting tubing gate 7 connected to pipeline, opening blowout-preventing gate 4 of sucker rod and keeping normally open, closing casing gate 8, lifting sucker rod 10 in well bore 15, opening positive injection passage, and passing CO2Injection line injecting CO2，CO2When the injection work is finished, connecting the top of the sucker rod 10 with the sucker rod hanger 1, closing the oil pipe gate 7, and stewing for 20-30 days;
step 2) after the well is stewed, opening a casing gate 8, removing a sucker rod hanger 1, connecting a sucker rod 10 with a polish rod, wherein the polish rod is connected with an oil extractor, lowering the sucker rod 10 to a preset position for well completion, observing the overflow change of the casing in the well completion process, rapidly closing a sucker rod blowout prevention gate 4 and the casing gate 8 if a blowout phenomenon occurs, opening a constant pressure air release valve 6 to control casing pressure, adjusting the pressure of a shaft 15, and ensuring the safe operation of a well head;
and 3) if no blowout phenomenon exists, opening an oil pipe gate 7 connected with the external conveying side connecting pipeline 5 and closing a casing pipe gate 8 during normal production, so that oil extraction operation can be performed, wherein the pressure gauge 2 reflects the pressure change of the well head in real time, and when the pressure of the well head exceeds 3MPa, the high-pressure stop valve 3 is immediately cut off to play a role in protecting the external conveying side connecting pipeline 5.
The pressure gauge, the high-pressure stop valve, the external delivery side connecting pipeline, the constant-pressure air release valve, the oil pipe gate, the casing pipe gate, the flange, the large four-way valve, the small four-way valve and the casing pipe head are all in the prior art.
The working principle of the utility model is as follows:
as shown in figures 1-3, a casing buckle 13 of the wellhead device of the utility model is connected with a casing head 14 in a shaft 15, the lower end of a large cross 11 is connected with the casing buckle 13 through a lower flange 9, two casing gates 8 are connected with two wings of the large cross 11 by clamps, a constant pressure relief damper 6 is arranged outside the casing gate 8, the upper end of the large cross 11 is connected with a small cross 12 through an oil pipe 16, a sucker rod blowout preventer 4 is designed between the large cross 11 and the small cross 12, the sucker rod blowout preventer 4 is an important part for closing the annular space between the sucker rod 10 and the oil pipe 16 and preventing well control events and mainly comprises a manual gate 4-1, a handle 4-2, a shell 4-3 and an annular sealing element 4-4, wherein the annular sealing element 4-4 comprises a semicircular rubber sealing ring 4-4-1 and an internal addition spring 4-4-2, the small four-way 12 is respectively connected with an oil pipe gate 7 through clamps at two wings, and a pressure gauge 2 and a high-pressure stop valve 3 are respectively arranged between the small four-way 12 and an external delivery edge connecting pipeline 5; CO 22Before huff and puff, the tubing gate 7 is opened and its end is connected to the CO2Connecting the injection pipelines, opening the blowout prevention gate 4 of the sucker rod, keeping the sucker rod normally open, and closing the casing gate 8; CO injection2When the well is filled, the sucker rod 10 in the well is lifted, the positive injection channel is opened, when the injection work is finished, the top of the sucker rod 10 is connected with the sucker rod hanger 1, the oil pipe gate 7 is closed, and the well is stewed; after the well is stewed, the casing gate 8 is opened, the pumping rod hanger 1 is removed, the pumping rod 10 is connected with a polish rod, the polish rod is connected with an oil pumping device, a pumping rod string is lowered to a preset position for well completion, the overflow change of the casing is observed in the well completion process, if the blowout phenomenon occurs, the blowout prevention gate 4 of the pumping rod is quickly closed, the casing gate 8 is closed, the casing pressure is controlled by using the constant pressure air release valve 6, the pressure of the shaft 15 is kept in a reasonable range, and the safe operation of the well head is ensured;
during normal production, open tubing gate 7, close sleeve pipe gate 8, well head manometer 2 reflects well head pressure change in real time, and when well head pressure exceeded design pressure 3MPa, high-pressure stop valve 3 just cut immediately, played the effect of the outer defeated limit of protection pipeline (the outer defeated limit connects the highest operating pressure 4MPa of pipeline) of line, the utility model discloses well head device safe and reliable has realized promptly and has poured into, can satisfy again and adopt, has realized the notes integration of adopting.
The utility model discloses the wellhead assembly is equipped with sucker rod hanger, CO2Before injection, the production pipe column can be put into the well, and the sucker rod is hung on the sucker rod hanger, so that CO can be injected positively without moving the pipe column2The utility model relates to a CO2The huff and puff well head is safe and reliable, and the injection and production integration is realized; the utility model discloses the oil recovery wellhead bearing pressure of wellhead assembly is greater than or equal to 21MPa, and the whole height of wellhead assembly is less than or equal to 950mm, compares with former oil recovery well head, and the pressure rating improves the one-level, satisfies high-pressure injection requirement, and has reduced the well head height, and be equipped with the sucker rod in the wellhead assembly and prevent spouting the gate, has realized emergency effective control well head, when special accidents such as well blowout take place in the pit, can the emergency control well head.
The utility model discloses the design has the high-pressure stop valve between oil pipe gate high pressure and outer defeated limit connects the pipeline low pressure, because the outer defeated limit connects the highest operating pressure of pipeline to be 4MPa, consequently need cut when exceeding 3MPa, protects outer defeated limit and connects the pipeline, the utility model discloses be fit for CO2The oil production well without the basic oil pumping unit is adopted, namely the oil production well with the limitation on the height of the well mouth.
Although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Many other changes and modifications can be made without departing from the spirit and scope of the invention. It is to be understood that the invention is not to be limited to the specific embodiments, and that the scope of the invention is defined by the appended claims.
Claims (9)
1. Suitable for CO2Integrated injection and productionThe wellhead device is characterized in that: the sucker rod blowout preventer comprises a sucker rod hanger (1), a sucker rod blowout preventer gate (4), an outer conveying edge connecting pipeline (5), two oil pipe gates (7), two casing pipe gates (8), a large cross joint (11) and a small cross joint (12), wherein the lower end of the large cross joint (11) is connected with a shaft (15), the upper end of the large cross joint (11) is connected with the lower end of the small cross joint (12) through an oil pipe (16), the middle position of the oil pipe (16) is provided with the sucker rod blowout preventer gate (4), the upper end of the small cross joint (12) is connected with the sucker rod hanger (1), a sucker rod (10) can be hung on the sucker rod hanger (1), the two sides of the large cross joint (11) are respectively connected with one casing pipe gate (8), the two sides of the small cross joint (12) are respectively connected with one oil pipe2And the outer side of the other oil pipe gate (7) is connected with an outer delivery side connecting pipeline (5).
2. A suitable CO according to claim 12Huff and puff injection-production integrated wellhead device, which is characterized in that: and a pressure gauge (2) and a high-pressure stop valve (3) are arranged between the oil pipe gate (7) and the outer conveying side connecting pipeline (5), the pressure gauge (2) is used for reflecting the pressure change of a well head, and the high-pressure stop valve (3) is used for timely stopping to protect the outer conveying side connecting pipeline (5).
3. A suitable CO according to claim 12Huff and puff injection-production integrated wellhead device, which is characterized in that: and a constant pressure air release valve (6) is arranged on the outer side of the casing pipe gate (8), sleeve pressure is controlled through the constant pressure air release valve (6), and the pressure of the shaft (15) is adjusted.
4. A suitable CO according to claim 12Huff and puff injection-production integrated wellhead device, which is characterized in that: the oil pipe joint is characterized in that an upper flange (17) is arranged at the upper end of the large four-way joint (11), an oil pipe (16) is connected with the upper end of the large four-way joint (11) through the upper flange (17), a lower flange (9) is arranged at the lower end of the large four-way joint (11), and a sleeve buckle (13) and the large four-way joint are buckled through the lower flange (9)(11) The lower end is connected, casing buckle (13) and casing head (14) cooperation are connected, and wherein casing head (14) set up inside pit shaft (15).
5. A suitable CO according to claim 12Huff and puff injection-production integrated wellhead device, which is characterized in that: the sucker rod blowout-preventing gate (4) comprises a first gate and a second gate, wherein the first gate and the second gate are oppositely arranged at the middle position of the oil pipe (16), the first gate and the second gate both comprise a manual gate (4-1), a handle (4-2), a shell (4-3) and an annular sealing element (4-4), wherein the manual gate (4-1) is connected with the handle (4-2), the handle (4-2) penetrates through the shell (4-3) to be connected with the annular sealing element (4-4), the annular sealing element (4-4) is arranged inside the shell (4-3), wherein the annular sealing member (4-4) can be moved left and right by the rotation of the manual gate (4-1) to open/close the annular space between the sucker rod (10) and the oil pipe (16).
6. A suitable CO according to claim 52Huff and puff injection-production integrated wellhead device, which is characterized in that: the annular sealing element (4-4) comprises a rubber sealing ring (4-4-1) and springs (4-4-2), wherein the rubber sealing ring (4-4-1) is of a semicircular structure, a plurality of springs (4-4-2) are arranged inside the rubber sealing ring (4-4-1), an annular space between the sucker rod (10) and the oil pipe (16) can be plugged when the two rubber sealing rings (4-4-1) of the semicircular structures which are oppositely arranged are in contact, and the annular space between the sucker rod (10) and the oil pipe (16) can be opened when the two rubber sealing rings (4-4-1) of the semicircular structures which are oppositely arranged are far away.
7. A suitable CO according to claim 62Huff and puff injection-production integrated wellhead device, which is characterized in that: the springs (4-4-2) are uniformly arranged inside the rubber sealing rings (4-4-1) along the radial direction of the oil pipe (16) in the circumferential direction, and 4-8 springs (4-8) are arranged inside one rubber sealing ring (4-4-1)4-4-2）。
8. A suitable CO according to claim 12Huff and puff injection-production integrated wellhead device, which is characterized in that: the sucker rod hanger (1) is a round cover structure consisting of an upper part and a lower part, wherein the inner wall of the lower part of the sucker rod hanger (1) is provided with a small four-way (12) upper end capable of being connected by threads, the center of the upper part of the sucker rod hanger (1) is provided with a through hole, wherein the inner wall of the through hole is provided with threads, and the threads of the inner wall of the through hole at the top of the sucker rod (10) can be hung on the sucker rod hanger (1).
9. A suitable CO according to claim 12Huff and puff injection-production integrated wellhead device, which is characterized in that: the integral height of the wellhead device is less than or equal to 950mm, and the pressure bearing capacity of the wellhead device is more than or equal to 21 MPa.
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| CN201921901523.8U CN211448593U (en) | 2019-11-06 | 2019-11-06 | Suitable for CO2Huff-puff injection-production integrated wellhead device |
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| CN201921901523.8U CN211448593U (en) | 2019-11-06 | 2019-11-06 | Suitable for CO2Huff-puff injection-production integrated wellhead device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110778284A (en) * | 2019-11-06 | 2020-02-11 | 中国石油天然气股份有限公司 | Suitable for CO 2Huff-puff injection-production integrated wellhead device and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110778284A (en) * | 2019-11-06 | 2020-02-11 | 中国石油天然气股份有限公司 | Suitable for CO 2Huff-puff injection-production integrated wellhead device and using method thereof |
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