CN212958583U - Layered gas injection and layered fracturing pipe column - Google Patents

Layered gas injection and layered fracturing pipe column Download PDF

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Publication number
CN212958583U
CN212958583U CN202021424597.XU CN202021424597U CN212958583U CN 212958583 U CN212958583 U CN 212958583U CN 202021424597 U CN202021424597 U CN 202021424597U CN 212958583 U CN212958583 U CN 212958583U
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packer
gas injection
gas
layered
fracturing
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薛旭周
张健
蒋春光
石刚
段超
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Jereh Energy Services Corp
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Jereh Energy Services Corp
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Abstract

The utility model discloses a layering gas injection layering fracturing tubular column, including coiled tubing, safety joint, water conservancy spray gun, first packer, water injection mandrel, second packer, locator and guide shoe, coiled tubing, safety joint, water conservancy spray gun, first packer, water injection mandrel, second packer, locator and guide shoe are connected in proper order. Has the advantages that: through the perforation of a hydraulic spray gun, the processes of gas injection, perforation and gas injection of a water distributor are separated, so that the processes of perforation, gas injection and fracturing can be completed by one-time pouring, the efficiency is high, and the cost is low; by arranging the first packer and the second packer, gas can only enter the perforation hole from an annular space between the first packer and the second packer during gas injection, so that the phenomenon of gas-liquid slippage is prevented; natural gas is used as the preposed energizing gas, so that elastic energy of the stratum can be supplemented, and the natural gas and the crude oil of the stratum can be dissolved mutually to reduce viscosity, thereby improving the recovery ratio.

Description

Layered gas injection and layered fracturing pipe column
Technical Field
The utility model relates to a fracturing technical field, concretely relates to layering gas injection layering fracturing tubular column.
Background
The shale oil horizontal well fracturing single well is low in yield and poor in benefit due to the influence of factors such as low oil reservoir gas content, insufficient elastic energy, high formation oil viscosity and the like. The fracturing preposed energy storage is the key for cost reduction and efficiency improvement, and CO is commonly adopted at present2Or N2As a pre-stored gas, albeit CO2And N2Can supplement elastic energy of stratum but CO2Limited gas source, special equipment, high cost, severe corrosion to oil well casing and ground flow, and CO2Is a greenhouse gas, is useless and harmful after being extracted. N is a radical of2The viscosity reduction effect is poor due to mutual dissolution with the crude oil in the stratum, special equipment is also needed, the cost is high, and oxygen contained in nitrogen has great damage to an oil well and the ground flow and is useless after production. The natural gas belongs to original gas, is most beneficial to oil well casing and ground flow, can be used for production, can supplement elastic energy of stratum, and can be dissolved with crude oil of the stratum to reduce viscosity, thereby improving the recovery ratio. However, due to the fact that the gas density is low and the liquid density is high, a serious gas-liquid slippage phenomenon exists during fracturing, a large amount of gas enters an annular space (annular space) between the continuous oil pipe and the casing pipe, partial gas cannot enter a stratum, the fracturing effect is poor, and production is restricted.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the defects of the prior art, providing a layered gas injection and layered fracturing tubular column, which realizes that the processes of perforation, gas injection and fracturing can be completed by one-time perfusion through the perforation of a hydraulic spray gun and the gas injection of a water distributor and the separation of the perforation and the gas injection process, and has high efficiency and low cost; by arranging the first packer and the second packer, gas can only enter the perforation hole from an annular space between the first packer and the second packer during gas injection, so that the phenomenon of gas-liquid slippage is prevented; natural gas is used as the preposed energizing gas, so that elastic energy of the stratum can be supplemented, and the natural gas and the crude oil of the stratum can be dissolved mutually to reduce viscosity, thereby improving the recovery ratio.
The purpose of the utility model is achieved through the following technical measures: the utility model provides a layering fracturing string of gas injection layering, includes coiled tubing, safety joint, water conservancy spray gun, first packer, water injection mandrel, second packer, locator and guide shoe, coiled tubing, safety joint, water conservancy spray gun, first packer, water injection mandrel, second packer, locator and guide shoe are connected in proper order.
Further, the first packer is a Y211 packer.
Further, the second packer is a K344 packer.
Furthermore, the separate-layer gas injection separate-layer fracturing pipe column further comprises a centralizer, and two ends of the centralizer are respectively connected with the safety joint and the hydraulic spray gun.
Furthermore, the separate-layer gas injection separate-layer fracturing pipe column further comprises a balance valve, and two ends of the balance valve are respectively connected with the hydraulic spray gun and the first packer.
Compared with the prior art, the beneficial effects of the utility model are that: the layered gas injection and layered fracturing pipe column is perforated through a hydraulic spray gun, gas injection is carried out through a water distributor, and the perforation and gas injection processes are separated, so that the perforation, gas injection and fracturing processes can be completed through one-time injection, the efficiency is high, and the cost is low; by arranging the first packer and the second packer, gas can only enter the perforation hole from an annular space between the first packer and the second packer during gas injection, so that the phenomenon of gas-liquid slippage is prevented; natural gas is used as the preposed energizing gas, so that elastic energy of the stratum can be supplemented, and the natural gas and the crude oil of the stratum can be dissolved mutually to reduce viscosity, thereby improving the recovery ratio.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic diagram of the structure of the separate-layer gas injection separate-layer fracturing pipe column.
The hydraulic control system comprises a coiled tubing 1, a safety joint 2, a centralizer 3, a hydraulic spray gun 4, a balance valve 5, a first packer 6, a water distributor 7, a second packer 8, a positioner 9, a guide shoe 10 and a sleeve 11.
Detailed Description
As shown in fig. 1, the layered gas injection and layered fracturing tubular column comprises a continuous oil pipe 1, a safety joint 2, a hydraulic spray gun 4, a first packer 6, a water distributor 7, a second packer 8, a positioner 9 and a guide shoe 10, wherein the continuous oil pipe 1, the safety joint 2, the hydraulic spray gun 4, the first packer 6, the water distributor 7, the second packer 8, the positioner 9 and the guide shoe 10 are sequentially connected. Specifically, the fracturing well is equipped with well head and sleeve pipe 11, the well head is connected with the one end of sleeve pipe 11, sleeve pipe 11 stretches into the shaft bottom, coiled tubing 1, safety joint 2, hydraulic spray gun 4, first packer 6, water injection mandrel 7, second packer 8, locator 9 and guide shoe 10 all establish in sleeve pipe 11, coiled tubing 1's one end is connected with the well head, coiled tubing 1's the other end is connected with safety joint 2, form the annular space between layering gas injection layering fracturing tubular column and the sleeve pipe 11, the well head is equipped with the gate valve, and the accessible gate valve realizes closing and opening of annular space. The process of perforation, gas injection and fracturing can be completed by one-time pouring through controlling the setting and the deblocking of the first packer 6 and the second packer 8, the efficiency is high, and the cost is low. During perforation, the first packer 6 and the second packer 8 are set, sand blasting is carried out from the hydraulic spray gun 4, and the perforation quality is good and the perforation efficiency is high. During gas injection, the first packer 6 and the second packer 8 are both set, and natural gas enters the incidence hole from the water distributor 7, so that gas-liquid slippage is avoided. And during fracturing, the first packer 6 is set, and fracturing fluid enters the incidence hole from the annular space to perform fracturing.
The first packer 6 is a Y211 packer. The Y211 packer is one-way slips support type packer, realizes setting by lifting and lowering the pipe column, and is directly unset by lifting the pipe column, simple in structure and convenient to operate.
The second packer 8 is a K344 packer. The K344 packer is a hydraulic expansion packer, hydraulic setting and hydraulic unsetting are achieved, mechanical operation is not needed, and operation is convenient and flexible.
The separate-layer gas injection separate-layer fracturing pipe column further comprises a centralizer 3, and two ends of the centralizer 3 are respectively connected with the safety joint 2 and the hydraulic spray gun 4. The centralizer 3 can ensure that the perforating position is accurate when the hydraulic spray gun 4 perforates, and the perforating quality and the perforating efficiency are improved.
The separate-layer gas injection separate-layer fracturing pipe column further comprises a balance valve 5, and two ends of the balance valve 5 are respectively connected with the hydraulic spray gun 4 and the first packer 6. The balancing valve 5 is used for balancing the pressure difference between the hydraulic spray gun 4 and the first packer 6, and facilitates the unsealing of the first packer 6.
In the actual operation process, the layered gas injection and layered fracturing pipe column conducts perforation, gas injection and fracturing layer by layer from the bottom of the fracturing well upwards, and finally the fracturing process of the whole well section is achieved.
The working principle is as follows:
and (3) single-layer perforation process: the fracturing well casing 11 is filled with liquid, the layered gas injection layered fracturing pipe column is lowered to the bottom of a fracturing well, a target perforation layer position is located through a positioner 9, a hydraulic spray gun 4 is located at the target perforation layer position, a Y211 packer is set, fracturing liquid is injected into a continuous oil pipe 1, the fracturing liquid passes through the continuous oil pipe 1, a safety joint 2, a centralizer 3 and enters the hydraulic spray gun 4, meanwhile, the fracturing liquid pressure is transmitted to a water distributor 7 and a K344 packer through the Y211 packer, the pressure in the K344 packer is increased, the K344 packer is set, at the moment, the two packers are both in a set state, an annular space between the two packers is a dead space, the fracturing liquid can only be sprayed out from the hydraulic spray gun 4 to carry out perforation, a wellhead gate valve is opened, and waste liquid is discharged back to the wellhead to realize a perforation process.
Single-layer gas injection process: when the continuous oil pipe 1 stops injecting the fracturing fluid, the Y211 packer is unsealed, the annular space between the Y211 packer and the K344 packer is communicated with the external annular space for pressure relief, the pressure in the K344 packer is reduced, the K344 packer is unsealed, the layered gas injection layered fracturing string is lifted up, the perforation position is just positioned between the Y211 packer and the K344 packer, then the Y211 packer is set, a wellhead gate valve is closed, the annular space on one side, close to the continuous oil pipe 1, of the Y211 packer is in a sealed state, natural gas is introduced into the continuous oil pipe 1, the natural gas enters the water distributor 7 and the K344 packer through the continuous oil pipe 1, the safety joint 2, the centralizer 3, the hydraulic spray gun 4, the balance valve 5 and the Y211 packer, the pressure in the K344 packer is increased, the K344 packer is set, the natural gas enters the annular space between the Y packer 211 and the K344 packer from the water distributor 7, and meanwhile, the natural gas can enter the annular space on, however, the annular space on one side of the Y211 packer close to the coiled tubing 1 is in a sealed state and is filled with liquid, so that the pressure in the annular space can be consistent with the pressure of the natural gas after a small amount of natural gas enters the annular space, the natural gas cannot continuously enter the annular space through the hydraulic spray gun 4, and at the moment, the natural gas can only enter the incident hole from the water distributor 7, so that the gas injection process is realized.
Single-layer fracturing process: deblocking Y211 packer, annular space and outside annular space intercommunication pressure release between Y211 packer and the K344 packer, K344 packer internal pressure reduces, K344 packer deblocking, lower layering gas injection layering fracturing tubular column, make Y211 packer be located the below of perforation layer, then sit and seal Y211 packer, let in fracturing fluid to the annular space by the well head, sit and seal K344 packer, consequently the annular space that one side of coiled tubing 1 was kept away from to Y211 packer is in encapsulated situation, fracturing fluid can only advance the incident hole from the annular space that Y211 packer is close to one side of coiled tubing 1, realize the fracturing process.
It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (5)

1. The utility model provides a layering gas injection layering fracturing tubular column which characterized in that: the continuous oil pipe, the safety joint, the hydraulic spray gun, the first packer, the water distributor, the second packer, the positioner and the guide shoe are sequentially connected.
2. The layered gas injection layered fracturing string of claim 1, wherein: the first packer is a Y211 packer.
3. The layered gas injection layered fracturing string of claim 1, wherein: the second packer is a K344 packer.
4. The layered gas injection layered fracturing string of claim 1, wherein: the separate-layer gas injection separate-layer fracturing pipe column further comprises a centralizer, and two ends of the centralizer are connected with the safety joint and the hydraulic spray gun respectively.
5. The layered gas injection layered fracturing string of claim 1, wherein: the layered gas injection and layered fracturing pipe column further comprises a balance valve, and two ends of the balance valve are respectively connected with the hydraulic spray gun and the first packer.
CN202021424597.XU 2020-07-17 2020-07-17 Layered gas injection and layered fracturing pipe column Active CN212958583U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113027407A (en) * 2021-04-21 2021-06-25 太原理工大学 Foam-gas composite staged fracturing method for stratum

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113027407A (en) * 2021-04-21 2021-06-25 太原理工大学 Foam-gas composite staged fracturing method for stratum
CN113027407B (en) * 2021-04-21 2022-04-05 太原理工大学 Foam-gas composite staged fracturing method for stratum

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