CN216008464U

CN216008464U - Reverse layering fracturing string based on temporary plugging soluble sieve tube

Info

Publication number: CN216008464U
Application number: CN202122313496.6U
Authority: CN
Inventors: 张伟; 邢秀贵; 王玉婷; 孙锐杰; 刘智仁; 王鹏
Original assignee: Shandong Precede Petroleum Technology Co ltd
Current assignee: Shandong Precede Petroleum Technology Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2022-03-11
Anticipated expiration: 2031-09-24

Abstract

The utility model discloses a reverse layered fracturing string based on a temporary plugging soluble sieve tube, which relates to the technical field of petroleum industry well completion engineering, and comprises an oil tube, a top packer, a well completion sieve tube and a bottom filling tool which are fixedly connected in sequence from top to bottom, wherein the well completion sieve tube comprises a base tube and a sieve sleeve, the base tube is a perforated tube, and the wall of the tube is provided with a plurality of base tube holes; the screen sleeve is fixedly sleeved on the outer side of the base pipe, a soluble material is plugged in the hole of the base pipe, the soluble material is of a wedge-shaped structure, a pin-type structure or a hemispherical structure, and the pressure bearing capacity of the soluble material is less than or equal to 30 MPa; the device realizes continuous construction of the tubular column once by using the physical property difference of an oil layer and a temporary plugging method of the temporary plugging agent, avoids repeated operation and reduces operation risk and cost.

Description

Reverse layering fracturing string based on temporary plugging soluble sieve tube

Technical Field

The utility model relates to a petroleum industry well completion engineering technical field, concretely relates to reverse layering fracturing string based on stifled soluble screen pipe temporarily.

Background

In the process of oil field exploration and development and oil gas production, in order to improve the yield of an oil gas well and the development effect of the oil field, fracturing, pickling and sand prevention transformation are often carried out on a reservoir stratum of the oil gas production well. At present, when the well completion construction of a multilayer oil and gas well is carried out, multiple pipe columns are often required to be matched for construction, and the construction process is complex, the construction risk is large and the cost is high. For other once filling well completion processes, all the horizons of the whole well section are generally constructed. Because stratum parameters and characteristics such as permeability, porosity and the like of each reservoir of the oil-gas well are different, the ideal construction effect between each layer is difficult to ensure in the general construction.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a reverse layering fracturing tubular column based on stifled soluble screen pipe temporarily to the defect that prior art exists.

The technical scheme of the utility model is that: a reverse layered fracturing string based on a temporary plugging soluble sieve tube comprises an oil tube, a top packer, a well completion sieve tube and a bottom filling tool which are fixedly connected in sequence from top to bottom, wherein the well completion sieve tube comprises a base tube and a sieve sleeve, the base tube is a perforated tube, and a plurality of base tube holes are formed in the wall of the base tube; the screen sleeve is fixedly sleeved on the outer side of the base pipe, a soluble material is plugged in the hole of the base pipe, the soluble material is of a wedge-shaped structure, a pin-type structure or a hemispherical structure, and the pressure bearing capacity of the soluble material is less than or equal to 30 MPa.

Preferably, an annular space is arranged between the screen sleeve and the base pipe of the well completion screen pipe.

Preferably, the soluble material is dissolved for a period of 4 to 5 days.

Preferably, the holes of the base pipe are uniformly arranged.

Preferably, the completion screen is of a drillable material.

Preferably, the upper part of the completion screen pipe is at least two meters higher than the upper part of the oil reservoir, and the lower part of the completion screen pipe is at least two meters lower than the lower part of the oil reservoir.

Compared with the prior art, the utility model, have following advantage:

the device can be applied to the well completion construction of multiple kinds such as separate-layer fracturing, acidification, sand prevention and the like of oil wells with large physical property difference; the device can be used for accurately constructing each oil layer, so that the problems of uneven construction, inconsistent effect and even ineffective construction of the oil layers with poor physical properties caused by the difference of the physical properties of the stratums are solved; the device realizes continuous construction of the tubular column once by using the physical property difference of an oil layer and a temporary plugging method of the temporary plugging agent, avoids repeated operation and reduces operation risk and cost.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a completion screen;

FIG. 3 is a schematic structural view of a well completion screen after plugging;

fig. 4 is a schematic diagram of the structure of various soluble materials.

In the figure: 1. oil pipe, 2, top packer, 3, completion screen, 4, base pipe, 401, base pipe hole, 5, screen jacket, 6, bottom filling tool, 7, soluble material.

Detailed Description

The present invention will be further explained with reference to the drawings and examples.

Example one

Referring to fig. 1-4, the reverse layered fracturing string based on the temporary plugging soluble sieve tube comprises an oil tube 1, a top packer 2, a completion sieve tube 3 and a bottom filling tool 6 which are fixedly connected in sequence from top to bottom, wherein the completion sieve tube 3 comprises a base tube 4 and a sieve sleeve 5, the base tube 4 is a perforated tube, and a plurality of holes 401 of the base tube 4 are formed in the wall of the perforated tube; the screen sleeve 5 is fixedly sleeved on the outer side of the base pipe 4, the holes 401 of the base pipe 4 are plugged with the soluble material 7, the soluble material 7 is of a wedge-shaped structure, a pin-type structure or a hemispherical structure, and the pressure bearing capacity of the soluble material 7 is less than or equal to 30 MPa.

In the actual construction stage, according to the data of each small layer obtained by logging, the construction parameters of each small layer are optimized through digital-analog software, so that the aims of uniformly constructing each small layer and reconstructing the small layer as required are fulfilled.

In actual well construction, a drifting tubular column is firstly put in, the drifting tubular column consists of a drifting gauge with the length not less than 1.5 m and an oil pipe 1, and the drifting tubular column is used for drifting to an artificial well bottom, so that dead oil sludge in a shaft is cleared, and the shaft communication caused by the untight setting of the top packer 2 is prevented.

Then the pipe scraper is driven into the setting position, and the setting position is scraped.

After the scraping is finished, the casing pipe at the upper part of the oil layer is subjected to pressure testing, the pressure P is ensured to be more than or equal to 15MPa, and the pressure drop is less than 0.5MPa within 30 minutes. And if the pressure test is unqualified, finding a leakage point for processing.

And then performing backwashing, further cleaning residual dead oil sludge and formation sand in the casing, and stopping backwashing when the return liquid of the oil pipe 1 is consistent with the pumped liquid.

After the well washing is finished, the well completion pipe string is put in and connected with a wellhead device; when the pipe column is lowered, the position of the completion screen pipe 3 covers the whole oil layer, namely the upper part of the completion screen pipe 3 is higher than the upper part of the oil layer by at least two meters, and the lower part of the completion screen pipe 3 is lower than the lower part of the oil layer by at least two meters; the base pipe 4 of the completion screen 3 is a perforated pipe, and the holes 401 of the base pipe 4 before well descending are blocked by soluble materials 7.

In the formal construction stage, the fracturing fluid is injected through the construction pipe column, the fracturing fluid is discharged through the bottom filling tool 6, and the holes 401 of the base pipe 4 are blocked by the soluble material 7, so that the fracturing fluid only flows to an oil layer. The oil layer with high permeability is pressed open at first under the action of the stratum liquid absorption capacity and the shaft pressure, the pressure reading of the instrument panel suddenly drops at the moment, then the pumping of fracturing fluid is stopped, and the temporary plugging agent is injected instead. After the oil layer with high permeability is opened by fracturing fluid, the permeability of the oil layer is further improved; similarly, when the temporary plugging agent is injected, the temporary plugging agent can firstly plug the oil layer with high permeability under the action of oil layer liquid absorption capacity and wellbore pressure, after the high permeability oil layer is plugged, the pressure reading of the instrument panel rises at the moment, then the temporary plugging agent is stopped being pumped, and at the moment, the fracturing construction of the high permeability oil layer is finished. The soluble material 7 of the holes 401 of the base pipe 4 can bear the pressure of 30MPa at most, and the temporary plugging agent can bear the pressure of 30MPa at most.

And after the high-permeability oil layer is constructed, repeating the construction steps, and constructing the medium-permeability oil layer and the low-permeability oil layer in sequence.

After the construction of the high, medium and low permeability oil layers is finished, the blocking remover is injected for blocking removal, and after the blocking removal is finished, the construction pipe column is taken out and put into production.

In the construction stage, the completion screen pipe 3 is in a sealed state under the plugging of the soluble material 7, liquid flow discharged from the bottom filling tool 6 cannot flow into the inside of the completion pipe string from the holes 401 of the base pipe 4, and only flows towards the stratum, so that the stratum fracturing filling is more complete. Meanwhile, in the construction process, the soluble material 7 is pressed by external pressure and is extruded from the outer side of the sieve tube to the inner side, and the soluble material 7 is more and more extruded and tighter under the action of the external pressure due to the special structure of the soluble material 7, so that the effects of sealing, pressure bearing and plugging are achieved, and the highest pressure bearing capacity is up to 30 MPa. After the construction is finished, the soluble material 7 is dissolved in 4-5 days, a channel blocked by the soluble material 7 before the well completion screen pipe 3 goes down the well is opened, and then a petroleum extraction channel is opened, so that petroleum is extracted through subsequent measures.

The device can be applied to the well completion construction of multiple kinds such as separate-layer fracturing, acidification, sand prevention and the like of oil wells with large physical property difference; through the accurate construction of this device to each oil reservoir, it is inhomogeneous to have reduced to lead to the construction because of stratum rerum natura difference, and the effect differs, and the poor oil reservoir construction of rerum natura even does not take effect problem.

Example two

As a preferred embodiment of the present invention, the structure of the completion screen 3 is optimized on the basis of the first embodiment, specifically:

in this embodiment, an annular space is provided between the screen jacket 5 of the completion screen 3 and the base pipe 4, which arrangement increases the axial mobility of the production fluid.

EXAMPLE III

As a preferred embodiment of the present invention, the completion screen 3 is further optimized on the basis of the second embodiment, specifically:

the completion screen 3 in this embodiment is of a drillable material and the base pipe 4 holes 401 on the base pipe 4 are evenly arranged.

Referring to fig. 1, the well completion pipe column and the construction pipe column are integrally designed, so that continuous construction of the pipe column can be realized once, repeated operation is avoided, and operation risk and cost are reduced.

The present invention is not limited to the above-described embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the spirit of the present invention, and the changed contents still belong to the protection scope of the present invention.

Claims

1. The utility model provides a reverse layering fracturing string based on stifled soluble screen pipe temporarily which characterized in that: the well completion sieve tube comprises a base tube and a sieve sleeve, wherein the base tube is a perforated tube, and the wall of the base tube is provided with a plurality of base tube holes; the screen sleeve is fixedly sleeved on the outer side of the base pipe, a soluble material is plugged in the hole of the base pipe, the soluble material is of a wedge-shaped structure, a pin-type structure or a hemispherical structure, and the pressure bearing capacity of the soluble material is less than or equal to 30 MPa.

2. The reverse zonal fracturing string based on a diverting soluble screen as claimed in claim 1, wherein: an annular space is arranged between the screen sleeve and the base pipe of the well completion screen pipe.

3. The reverse zonal fracturing string based on a diverting soluble screen as claimed in claim 1, wherein: the soluble material is dissolved for 4-5 days.

4. The reverse zonal fracturing string based on a diverting soluble screen as claimed in claim 1, wherein: the holes of the base pipe on the base pipe are uniformly distributed.

5. The reverse zonal fracturing string based on a diverting soluble screen as claimed in claim 1, wherein: the completion screen is of a drillable material.

6. The reverse zonal fracturing string based on a diverting soluble screen as claimed in claim 1, wherein: the upper part of the well completion sieve pipe is at least two meters higher than the upper part of the oil reservoir, and the lower part of the well completion sieve pipe is at least two meters lower than the lower part of the oil reservoir.