CN216157647U - Multi-stage negative pressure suction pipe-discharging column - Google Patents

Abstract

The utility model provides a multistage negative pressure suction and production pipe arranging column, wherein the tail end of a continuous oil pipe is connected with the head end of a jet pump, the tail end of the jet pump is connected with the head end of a packer, the packer is utilized to seal an inner channel of the oil pipe, after the inner channel of the oil pipe is sealed, a continuous high-pressure air source injects air into the continuous oil pipe, and high-pressure air flows out to an annular space formed between the outer wall of the pipe arranging column and the inner wall of the oil pipe through the jet pump, so that the aim of well bore liquid drainage is fulfilled, and the jet pump adopts a gas jet pump. The jet pump and the packer are introduced to jointly block the communication between the construction pressure and the stratum, so that the secondary damage of the stratum caused by the construction pressure is prevented.

Description

Multi-stage negative pressure suction pipe-discharging column

Technical Field

The utility model relates to the technical field of drainage of gas production wells in oil fields, in particular to a multi-stage negative pressure suction drainage pipe column.

Background

Most offshore gas reservoirs are developed in a depletion mode, liquid accumulation in a shaft of a gas well is gradually serious along with the reduction of formation pressure, and the number of wells which stop spraying even due to the influence of the liquid accumulation in the conventional production well accounts for 37.5 percent. Only a few mature gas well drainage and production processes are suitable for offshore platforms and have large limitations, and when the local layer pressure coefficient is less than 0.5, the existing drainage and production technology is ineffective. The land compact sandstone gas also faces the same dilemma, the occupation ratio of the liquid accumulation well is up to 75 percent, 10 percent of the liquid accumulation well is stopped, the reproduction process means after the spray is stopped is deficient, and the reproduction success rate is low.

At present, for the production of a new gas well and the re-production of a blowout-stopping well, a ground auxiliary pressure reduction or shaft liquid drainage process technology is mainly adopted, but the two process means have certain limitations.

The ground pressure reduction gas production technology is divided into two stages of first pressure reduction of a high-power compressor and deep pressure reduction of a flow ejector, but the application range is limited, and the gas-liquid ratio is larger than 3000m³/m³Is effective for gas wells with a gas-liquid ratio of less than 3000m³/m³The liquid accumulation gas well has poor applicability and discomfortThe method is used for the production recovery of low-pressure liquid-accumulating gas wells and the production of new wells, and only can play an auxiliary role.

The well drainage technique adopts conventional gas lift, high-pressure gas is injected into the well (generally nitrogen gas-nitrogen or liquid nitrogen) by using a straight-through pipe column, and carrying liquid is discharged from another channel in the well, so that the effect of gas lift alternate injection is achieved. However, for low-pressure gas wells, the conventional gas lift construction pressure acts on a shaft, so that shaft liquid is pushed into a stratum, secondary pollution to the stratum is caused, and the success rate of blowout replacement is low.

Aiming at the drainage problem of the low-pressure gas well in the later stage of gas field development, a new process technology is urgently needed to release the productivity of the gas well and improve the ultimate recovery ratio.

SUMMERY OF THE UTILITY MODEL

The utility model provides a multistage negative pressure suction and extraction pipe column and an extraction method thereof, wherein a jet pump and a packer are introduced to jointly block the communication between construction pressure and a stratum, so that the secondary damage of the stratum caused by the construction pressure is prevented.

The purpose of the utility model is realized by the following technical scheme.

The utility model provides a multistage negative pressure suction adopts calandria post, includes coiled tubing, packer and jet pump, coiled tubing's tail end with jet pump's head end links to each other, jet pump's tail end with the head end of packer links to each other, utilizes the packer to seal the interior passageway of oil pipe, and after the passageway was sealed in the oil pipe, continuous high pressurized air source carries out the gas injection to coiled tubing, and high-pressure gas flows to the annular space that forms between the outer wall of calandria post and the inner wall of oil pipe via the jet pump in to realize the mesh of pit shaft flowing back, jet pump adopts gaseous jet pump.

The packer is capable of sealing API tubing of 3.5 inch gauge or greater.

The tensile strength of the gas jet pump is greater than that of the continuous oil pipe.

A drainage and mining method of a multi-stage negative pressure suction drainage pipe column comprises the following steps:

step 1, installing a coiled tubing downhole blowout preventer at a test gate of a gas production tree, then assembling a downhole multistage negative pressure pumping, discharging and producing string, installing the multistage negative pressure pumping, discharging and producing string in the coiled tubing downhole blowout preventer, testing various pieces of ground supporting equipment, and preparing before downhole;

step 2, conducting all matched equipment of a well mouth, and putting the multistage negative pressure pumping and discharging extraction pipe column into the well;

step 3, when the coiled tubing is lowered to a position 10m in the well, testing the setting effect of the packer, wherein the setting adopts a downward pressing setting mode, the deblocking adopts an upward deblocking mode, then the coiled tubing is lifted, whether deblocking force deblocking is achieved is confirmed, and after the testing is successful, formal well descending is started, and well descending is carried out at a constant speed;

step 4, formally setting the packer for the first time: the setting position is 500-;

and 5, formally unsealing the packer for the first time: lifting the coiled tubing to unseal the packer;

step 6, after the deblocking is normal, moving down the multi-stage negative pressure suction extraction pipe column to repeat the steps 2-6 until the multi-stage negative pressure suction extraction pipe column is lowered to the underground final position, continuously or intermittently injecting gas at the underground final position until the purpose of induced flow is finished, and stopping injecting gas when the induced flow reaches the designed stratum gas production rate;

and 7, finally lifting the coiled tubing to unseal the packer, maintaining the normal production channel smooth, lifting the multi-stage negative pressure pumping and discharging extraction pipe column out of the shaft at a constant speed, and dismantling the construction equipment to finish construction.

In step 3, the downhole speed is 400- & lt 500 & gt m/h.

In step 4, the depth of the penetration is not more than 700m, the injection starting pressure is not more than 12MPa, and the gas injection pressure is 10-12 MPa.

In step 7, the pull-out speed is 400- & lt 500 & gt m/h.

The utility model has the beneficial effects that: the construction direction of the utility model is from the well head to the well bottom, and a jet pump and a packer are introduced to jointly block the communication between the construction pressure and the stratum, so that the secondary damage of the stratum caused by the construction pressure is prevented; the conventional liquid jet pump is changed into a gas jet pump, continuous high-pressure gas forms high-speed gas flow through a nozzle, continuous negative pressure is generated in a spraying cavity, shaft fluid is continuously sucked into the spraying cavity and is brought into a diffusion cavity, and the shaft fluid is mixed and then enters an annular space under the driving of residual kinetic energy of the high-pressure gas to be lifted to the ground.

Drawings

FIG. 1 is a schematic illustration of an SG-1 type packer;

FIG. 2 is a schematic diagram of a gas jet pump;

FIG. 3 is a schematic view of a tool string assembly below a coiled tubing for construction, wherein 1 is coiled tubing, 2 is a jet pump, and 3 is a packer;

FIG. 4A is a schematic illustration of the packer of the present invention unset;

FIG. 4B is a schematic view of the packer of the present invention set for the first time;

FIG. 4C is a schematic view of the packer of the present invention being unset for the first time;

FIG. 4D is a schematic view of the packer of the present invention set a second time.

For a person skilled in the art, other relevant figures can be obtained from the above figures without inventive effort.

Detailed Description

The technical solution of the present invention is further illustrated by the following specific examples.

Example one

The utility model provides a row tubular column is adopted in multistage negative pressure suction, including coiled tubing 1, packer 3 and jet pump 2, coiled tubing 1's tail end links to each other with jet pump 2's head end, jet pump 2's tail end links to each other with packer 3's head end, utilize jet pump 2 to keep apart the interior passageway of oil pipe, after the passageway is kept apart in the oil pipe, continuous high-pressure air supply injects to coiled tubing 1, high-pressure gas produces the negative pressure via the injection of jet pump 2 nozzle, inhale the fluid in the pit, flow to the annular space who is formed between row's tubular column outer wall and the oil pipe inner wall sealed by packer 3 after mixing in the diffuser pipe, again through this space discharge ground, in order to realize the mesh of pit shaft flowing back, jet pump 2 adopts gaseous jet pump.

Example two

On the basis of the first embodiment, the packer 3 can seal API oil pipes with the specification of more than or equal to 3.5 inches.

The tensile strength of the gas jet pump is greater than that of the coiled tubing 1.

EXAMPLE III

A drainage and mining method of a multi-stage negative pressure suction drainage pipe column comprises the following steps:

step 1, installing a coiled tubing downhole blowout preventer at a test gate of a gas production tree, then assembling a downhole multistage negative pressure pumping, discharging and producing string, installing the multistage negative pressure pumping, discharging and producing string in the coiled tubing downhole blowout preventer, testing various pieces of ground supporting equipment, and preparing before downhole;

step 2, conducting all matched equipment of a well mouth, and putting the multistage negative pressure pumping and discharging extraction pipe column into the well;

step 3, when the coiled tubing is lowered to a position 10m inside the well, testing the setting effect of the packer, wherein the setting adopts a downward pressing setting mode, the deblocking adopts an upward deblocking mode, then the coiled tubing is lifted, whether deblocking is performed or not is confirmed, and after the testing is successful, formal well lowering is started, and well lowering is performed at a constant speed according to the requirement of the lowering speed of the packer;

step 4, formally setting the packer for the first time: the setting position is 500-;

and 5, formally unsealing the packer for the first time: lifting the coiled tubing to unseal the packer;

step 6, after the deblocking is normal, moving down the multi-stage negative pressure suction extraction pipe column to repeat the steps 2-6 until the multi-stage negative pressure suction extraction pipe column is lowered to the underground designed end point position, continuously or intermittently injecting gas at the underground end point position until the purpose of induced flow is finished, and stopping injecting gas when the induced flow reaches the designed stratum gas production rate;

and 7, finally lifting the coiled tubing to unseal the packer, maintaining the normal production channel smooth, lifting the multi-stage negative pressure pumping and discharging extraction pipe column out of the shaft at a constant speed, and dismantling the construction equipment to finish construction.

In step 3, the downhole speed is 400- & lt 500 & gt m/h.

In step 4, the drop depth is not more than 700m, the injection starting pressure is not more than 12MPa, and the gas injection pressure is 10-12 MPa.

In step 7, the pull-out speed is 400- & lt 500 & gt m/h.

The construction device comprises:

1. SG-1 type packer: the application range is more than 3.5in, the specific specification and model are determined according to the specification of the original well pipe column, and the working parameters are determined by the construction requirement and the packer processing requirement;

2. a gas jet pump: the overflowing parameters are customized according to the construction liquid drainage and gas production requirements, the appearance specification is selected according to the specification of an original well pipe column, safe well descending is facilitated, and the tensile strength must be greater than that of a continuous oil pipe;

3. a coiled tubing: the specification of the coiled tubing is determined according to the construction well depth and the requirements of the setting and unsetting force of the selected packer;

4. a ground high-pressure gas source: the pressure is 10-15MPa, and the liquid content volume ratio is less than 2 percent; the air flow is determined according to the calculation; high-pressure dry gas in a gas production system of the device can be adopted, and membrane nitrogen and nitrogen can also be adopted.

Spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used in the embodiments for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

Moreover, relational terms such as "first" and "second," and the like, may be used solely to distinguish one element from another element having the same name, without necessarily requiring or implying any actual such relationship or order between such elements.

The present invention has been described in detail, but the above description is only a preferred embodiment of the present invention, and is not to be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims (3)

1. The utility model provides a row tubular column is adopted in multistage negative pressure suction which characterized in that: including coiled tubing, packer and jet pump, coiled tubing's tail end with the head end of jet pump links to each other, the tail end of jet pump with the head end of packer links to each other, the packer is used for sealing the passageway in the oil pipe, and high-pressure gas gets into in the coiled tubing, flows to the annular space that forms between the outer wall of adopting row tubular column and the inner wall of oil pipe via the jet pump in to realize the mesh of pit shaft flowing back, the jet pump adopts gaseous jet pump.

2. The multi-stage negative pressure suction production and drainage pipe column according to claim 1, wherein: the packer is capable of sealing API tubing of 3.5 inch gauge or greater.

3. The multi-stage negative pressure suction production and drainage pipe column according to claim 1, wherein: the tensile strength of the gas jet pump is greater than that of the continuous oil pipe.

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