CN216588553U - Integrated tubular column for gas injection and dilution production of heavy oil well - Google Patents

Abstract

The utility model discloses an integrated tubular column for gas injection and dilution production of a heavy oil well, which relates to the technical field of petroleum and gas extraction, and comprises a sleeve, an oil pipe, an oil well pump arranged in the oil pipe, a packer and a dilution check valve; the dilution check valve is arranged below the oil well pump, and the packer surrounds the oil pipe and is fixed between the oil pipe and the sleeve; the inner surface of the oil pipe is uniformly coated with a corrosion-resistant coating; the oil pipe is internally provided with a sucker rod, and the sucker rod consists of a polished rod and an anti-corrosion sucker rod which are fixedly connected from top to bottom; the tail end of the anti-corrosion sucker rod is fixedly connected with the plunger of the oil pump. The utility model can realize multiple production works such as gas injection, dilution and the like, simultaneously realize the corrosion resistance of the pipe pole column and the sleeve, and improve the service life.

Description

Integrated tubular column for gas injection and dilution production of heavy oil well

Technical Field

The utility model relates to the technical field of petroleum and natural gas exploitation, in particular to an integrated tubular column for gas injection and dilution production of a heavy oil well.

Background

The main power producing layer of the Tahe oil field is an Ordovician fracture-cave carbonate reservoir, wherein eight areas and ten areas mainly use heavy oil and are developed by adopting a thin oil-doped viscosity reduction mode. For thick oil well exploitation, a viscosity reducer is injected into an oil storage layer through a dilution tool to reduce the viscosity of oil in the oil storage layer, so that the difficulty of oil exploitation is reduced. Mix rare instrument including setting up tubular column and the sliding sleeve in the sleeve pipe, during the use, subaerial to the annular space between oil pipe and the sleeve pipe in pour into and fall the gluing agent and pressurize, make the sliding sleeve slide along the body to compression spring, when the sliding sleeve removed to through-hole upper portion, fall in the gluing agent can flow into oil pipe through the through-hole, and then flow into in the oil storage layer through oil pipe, in order to reduce the viscosity of oil in the oil storage layer.

As development progresses further and further, the water content of the oil production block rises gradually, and a large amount of attic oil exists at the top of the reservoir. Aiming at the exploitation of the attic oil, the prior gradual test is carried out, nitrogen is popularized and injected, the oil-water interface is reduced through the gravity differentiation, and the attic oil is exploited. But limited by nitrogen making equipment, the purity of injected nitrogen can only reach 99.2 percent, the oxygen concentration is 0.8 percent, the average single well gas injection amount is 70 ten thousand, and the oxygen content can reach 7000 in the process of exploitation.

Chinese patent No. ZL2020201650296 discloses a gas injection antiscale thick oil pumping pump, which belongs to a mechanical pumping pipe column with a packer protective sleeve, meets the mechanical pumping and gas injection requirements of a thin oil well, but the oil pipe and the sucker rod have no anticorrosion capability. When the nitrogen injection is used for exploitation, the oxygen content reaches a certain degree, after the gas and the liquid enter the oil pipe, the sucker rod and an external sleeve are easy to oxidize and corrode, the oxidation and the corrosion become important factors influencing the service life of the rod pump, the service life is reduced, the actual production period is less than one year, the operation is frequent, and the replacement cost of the oil pipe and the sucker rod is high. Meanwhile, for a thick oil gas injection well with a lower packer protective sleeve, thin oil is required to be doped for production of the thick oil well, so that the viscosity of crude oil is reduced, but the structure of the conventional pipe column cannot meet the requirement of doping of the thin oil for production, so that the thick oil wells cannot perform gas injection, and the performance of productivity is influenced.

Because the conventional tubular column does not have an anti-corrosion condition, a packer must be designed for protecting a casing aiming at a heavy oil well with the nitrogen injection amount exceeding 300 ten thousand square, but the conventional tubular column with the packer cannot meet the dilution production, and the design of the conventional tubular column must be improved, so that the conventional tubular column can not only achieve the anti-corrosion and oxidation effects, but also realize various production works such as gas injection, dilution and the like.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model provides an integrated pipe column for gas injection and dilution production of a heavy oil well, which prolongs the service life of a casing pipe and the pipe column, and achieves the purposes of machine pumping, gas injection, dilution, scale prevention and protection of the casing pipe without replacing the pipe column.

The technical scheme adopted by the utility model is as follows:

an integrated pipe column for gas injection and dilution production of a heavy oil well comprises a sleeve, an oil pipe and an oil well pump arranged in the oil pipe, wherein the sleeve is coaxially sleeved outside the oil pipe, an oil sleeve annulus is formed between the sleeve and the oil pipe,

the device also comprises a packer and a diluted check valve;

the rare-earth doped check valve is arranged below the oil well pump, the packer is arranged below the rare-earth doped check valve, the packer surrounds the oil pipe and is fixed between the oil pipe and the sleeve, and the packer seals the oil sleeve annulus into an annular cavity structure;

the inner surface of the oil pipe is uniformly coated with a corrosion-resistant coating; the oil pipe is internally provided with a sucker rod, and the sucker rod consists of a polished rod and an anti-corrosion sucker rod which are fixedly connected from top to bottom; the tail end of the anti-corrosion sucker rod is fixedly connected with the plunger of the oil pump.

Preferably, sealing devices are arranged between the packer and the oil pipe and between the packer and the casing pipe.

Preferably, the sealing device is a sealing ring.

Preferably, the side wall of the thin oil mixing check valve is uniformly provided with a plurality of one-way thin oil mixing holes, and the one-way thin oil mixing holes are used for injecting thin oil into the oil pipe.

Preferably, the tail end of the oil pipe is sequentially provided with a sieve pipe and a plug from top to bottom; the screen pipe and the plug are both positioned below the packer.

Preferably, the anti-corrosion sucker rod is an epoxy sucker rod.

Preferably, the corrosion-resistant coating is graphene.

Preferably, the oil well pump is a feedback type thickening pump.

Compared with the prior art, the utility model has the beneficial effects that:

1. the integrated pipe column is provided with the packer, the packer can be set with a setting position according to the requirement of the external extrusion resistance strength of the casing pipe, so that the annular space of the oil sleeve is separated and sealed, gas is prevented from entering the air of the oil sleeve ring at the upper part of the packer from the bottom of the oil pipe during gas injection, and the purpose of protecting the casing pipe is achieved.

2. The sucker rod comprises from last polished rod and the anticorrosion sucker rod of down fixed connection, and oil pipe inside all coats and has covered a layer corrosion resistant coating, has realized the corrosion-resistant of pipe pole post, improves life.

3. The designed diluted check valve has the function of one-way flow, and gas and liquid can only enter the interior of the oil pipe from the annular space of the casing pipe. On one hand, during gas injection, gas is injected from the oil pipe, and the gas cannot enter the sleeve, so that the sleeve is prevented from being corroded; on the other hand, when the thin oil is mixed for production, the thin oil is injected from the oil sleeve annulus between the oil pipe and the sleeve, enters the oil pipe through the thin oil mixing check valve and is mixed with the formation crude oil, the viscosity of the crude oil is reduced, and the normal production of the thick oil well after the gas injection is ensured.

Drawings

FIG. 1 is a schematic structural diagram of an integrated pipe column for gas injection and dilution production of a heavy oil well according to the present invention;

FIG. 2 is a schematic diagram of gas-liquid flow in an integrated pipe column for gas injection and dilution production of a heavy oil well, provided by the utility model.

Reference numerals:

1-casing pipe, 2-oil pipe, 3-sucker rod, 4-feedback type thick oil pump, 5-thin-mixed check valve, 6-packer, 7-sieve pipe and 8-plug.

Detailed Description

In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.

In the description of the present application, it is to be understood that the terms "length," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship as shown in the drawings, which are used for convenience in describing and simplifying the present application, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present application.

As shown in fig. 1, an integrated tubular column for gas injection and dilution production of a heavy oil well comprises a sleeve 1, an oil pipe 2 and an oil well pump 4 arranged in the oil pipe 2, wherein the sleeve 1 is coaxially sleeved outside the oil pipe 2, and an oil sleeve annulus is formed between the sleeve 1 and the oil pipe 2.

The integrated tubular column further comprises a packer 6 and a dilution check valve 5.

The thin oil mixing check valve 5 is arranged below the oil well pump 4, a plurality of one-way thin oil mixing holes are uniformly formed in the side wall of the thin oil mixing check valve 5, and the one-way thin oil mixing holes are used for injecting thin oil from the inside of an oil sleeve annulus into the oil pipe 2. The dilution check valve 5 has the function of one-way flow, gas and liquid can only enter the oil pipe 2 from the annular space of the oil sleeve, but cannot enter the air of the oil sleeve from the inside of the oil pipe 2, and the sleeve 1 is prevented from being corroded by gas.

The packer 6 is arranged below the diluted check valve 5, the packer 6 surrounds the oil pipe 2 and is fixed between the oil pipe 2 and the casing 1, sealing devices are arranged between the packer 6 and the oil pipe 2 and between the packer 6 and the casing 1, in the embodiment, the sealing devices are sealing rings, and other sealing devices can be arranged. The packer 6 seals the oil sleeve annulus into an annular cavity structure; during dilution production, diluted oil is injected from an oil sleeve annulus between the oil pipe 2 and the sleeve 1, enters the oil pipe 2 through the dilution single-flow valve 5, is mixed with formation crude oil pumped up from the oil pump 4 in the oil pipe 2, reduces the viscosity of the crude oil, and ensures normal production of the thickened oil well after gas injection.

The inner surface of the oil pipe 2 is uniformly coated with a corrosion-resistant coating; the oil pipe 2 is internally provided with a sucker rod 3, and the sucker rod 3 consists of a polished rod and an anti-corrosion sucker rod which are fixedly connected from top to bottom; the tail end of the anti-corrosion sucker rod is fixedly connected with the plunger of the oil well pump 4. The arrangement of the anti-corrosion sucker rod and the anti-corrosion coating ensures that the sucker rod 3 and the oil pipe 2 have higher corrosion resistance and wear resistance under the complex oil and gas exploitation condition, and the service life is prolonged. In the embodiment, the anticorrosion sucker rod is an epoxy sucker rod 3, and the epoxy sucker rod 3 has high wear resistance and smooth surface, so that the wax deposition and scaling on the surface of the sucker rod 3 are effectively slowed down, the underground friction resistance is reduced, and the oil pumping efficiency is improved; the corrosion-resistant coating is made of graphene, and has an anti-corrosion effect, so that the sleeve 1 has good thermal stability and chemical stability.

The oil well pump 4 is a feedback type thick oil pumping pump, adopts a mode of connecting a large pump and a small pump in series, has hydraulic feedback force in a lower stroke, can help the sucker rod 3 to overcome the resistance of thick oil to move downwards, has an automatic oil drainage function, does not need an oil drainer, and is suitable for conventional thick oil well exploitation and steam huff and puff thick oil well exploitation.

The tail end of the oil pipe 2 is sequentially provided with a sieve pipe 7 and a plug 8 from top to bottom; the screen pipe 7 and the plug 8 are both located below the packer 6. The screen pipe 7 can block large-particle sand in oil, the oil pipe 2 can be connected between the plug 8 and the screen pipe 7 and used as a sand setting tail pipe, and small-particle sand is deposited in the sand setting tail pipe at the bottom of the screen pipe 7, so that the small-particle sand and large-particle sand in the oil are removed, the sand blocking and setting effects are good, the oil well pump 4 can be ensured to perform normal lifting work, and the sand blocking condition of the oil well pump 4 is avoided.

As shown in fig. 2, in the integrated tubular column for gas injection and dilution production of the heavy oil well, during gas injection, gas is injected from the oil pipe 2 and is injected into the oil well through the oil pipe 2, and since the dilution check valve 5 is a one-way valve, the gas cannot enter the casing 1 from the oil pipe 2, so that the casing 1 is prevented from being corroded, meanwhile, the inner surface of the oil pipe 2 is uniformly coated with a corrosion-resistant coating, and the sucker rod 3 adopts an anti-corrosion sucker rod, so that the corrosion resistance of the oil pipe 2 and the sucker rod 3 can be improved; when the dilution is carried out, the diluted oil is injected from the upper annular cavity of the oil sleeve annulus between the oil pipe 2 and the sleeve 1, enters the oil pipe 2 through the dilution check valve 5, is mixed with the formation crude oil pumped up through the oil well pump 4 in the oil pipe 2, reduces the viscosity of the crude oil, reduces the resistance of the crude oil entering the pump, achieves the purpose of dilution and viscosity reduction under the pump, and ensures the normal production of the thickened oil well after the gas injection.

The above are merely embodiments of the present invention, which are described in detail and with particularity, and therefore should not be construed as limiting the scope of the utility model. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.

Claims (8)

1. The utility model provides an integration tubular column for viscous crude gas injection and mix rare production, includes sleeve pipe, oil pipe and establishes oil-well pump in the oil pipe, the sleeve pipe box is in the oil pipe outside, the sleeve pipe with oil pipe coaxial and between form oil jacket annular space, its characterized in that:

the device also comprises a packer and a diluted check valve;

the rare-earth doped check valve is arranged below the oil well pump, the packer is arranged below the rare-earth doped check valve, the packer surrounds the oil pipe and is fixed between the oil pipe and the sleeve, and the packer seals the oil sleeve annulus into an annular cavity structure;

the inner surface of the oil pipe is uniformly coated with a corrosion-resistant coating; the oil pipe is internally provided with a sucker rod, and the sucker rod consists of a polished rod and an anti-corrosion sucker rod which are fixedly connected from top to bottom; the tail end of the anti-corrosion sucker rod is fixedly connected with the plunger of the oil pump.

2. The integrated tubular column for gas injection and dilution production for heavy oil wells according to claim 1, characterized in that: and sealing devices are arranged between the packer and the oil pipe and between the packer and the casing pipe.

3. The integrated tubular column for gas injection and dilution production for heavy oil wells according to claim 2, characterized in that: the sealing device is a sealing ring.

4. The integrated tubular column for gas injection and dilution production of heavy oil wells as claimed in claim 1, wherein: the side wall of the thin oil mixing check valve is uniformly provided with a plurality of one-way thin oil mixing holes, and the one-way thin oil mixing holes are used for injecting thin oil into the oil pipe.

5. The integrated tubular column for gas injection and dilution production for heavy oil wells according to claim 1, characterized in that: the tail end of the oil pipe is sequentially provided with a sieve pipe and a plug from top to bottom; the screen pipe and the plug are both positioned below the packer.

6. The integrated tubular column for gas injection and dilution production for heavy oil wells according to claim 1, characterized in that: the anticorrosion sucker rod is an epoxy resin sucker rod.

7. The integrated tubular column for gas injection and dilution production for heavy oil wells according to claim 1, characterized in that: the corrosion-resistant coating is graphene.

8. The integrated tubular column for gas injection and dilution production for heavy oil wells according to claim 1, characterized in that: the oil well pump is a feedback type thick oil pump.

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