CN215057297U - Fracturing string for reforming old well with multiple coal seams and short bed interval coal bed gas - Google Patents
Fracturing string for reforming old well with multiple coal seams and short bed interval coal bed gas Download PDFInfo
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- CN215057297U CN215057297U CN202120733882.8U CN202120733882U CN215057297U CN 215057297 U CN215057297 U CN 215057297U CN 202120733882 U CN202120733882 U CN 202120733882U CN 215057297 U CN215057297 U CN 215057297U
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Abstract
The utility model provides a fracturing string for reforming an old well with multiple coal seams and short-layer spacing coal bed gas, which belongs to the technical field of fracturing strings and comprises an oil pipe I, a safety joint, a hydraulic anchor, a packer I, an oil pipe II and a flow controller which are sequentially connected from a well head to a well bottom; the pipe diameters of the oil pipe I and the oil pipe II are the same and are connected through a safety joint; the hydraulic anchor and the packer I are arranged outside the oil pipe II; the throttler is connected with the bottom end of the oil pipe II. The utility model discloses can carry out the fracturing in layers to the old well of coal bed gas and reform transform, improve the old well output of coal bed gas.
Description
Technical Field
The utility model belongs to the technical field of the fracturing string, a many coal seams, short layer are apart from old well of coal bed gas and are reformed transform and use fracturing string is specifically disclosed.
Background
At present, the industry widely uses the hydraulic fracturing technology to reform a coal seam, the coal seam is enabled to form a seam network through hydraulic fracturing, the permeability of the coal seam is improved, and then the coal seam gas is produced through drainage and depressurization. Coal-bed gas wells have the characteristic of rapid gas production rate attenuation, particularly the characteristic of a thin coal bed is remarkable, so that the coal-bed gas wells need to be reformed to recover and improve the yield. The common old well fracturing reformation comprises repeated secondary fracturing of a fractured position, a radial well technology, a plasma pulse blockage removal technology and the like, and the old well with multiple coal seams and short layer distances (the layer distance is within 20 meters) is reformed by the method by the applicant, but the yield increasing effect is not obvious after reformation.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a many coal seams, short layer apart from (the layer apart from within 20 meters) old well of coal bed gas reforms transform and uses the fracturing tubular column, can carry out the layering fracturing to old well of coal bed gas and reform transform, improve old well of coal bed gas output.
In order to achieve the purpose, the utility model provides a fracturing string for reforming a multi-coal-bed short-distance coal bed methane old well, which comprises an oil pipe I, a safety joint, a hydraulic anchor, a packer I, an oil pipe II and a flow controller which are sequentially connected from a well mouth to a well bottom; the pipe diameters of the oil pipe I and the oil pipe II are the same and are connected through a safety joint; the hydraulic anchor and the packer I are arranged outside the oil pipe II; the throttler is connected with the bottom end of the oil pipe II.
Furthermore, a grease layer is coated between the safety joint and the oil pipe I and between the safety joint and the oil pipe II.
Furthermore, the specification of the oil pipe I and the oil pipe II is 89mm, and the specification of the restrictor is 40 mm.
The utility model also provides a fracturing string for the old well reconstruction of the multi-coal-bed and short-range coal bed gas, which comprises an oil pipe I, a safety joint, a hydraulic anchor, a packer I, an oil pipe II, a flow controller, an oil pipe III, a packer II and a ball seat which are sequentially connected from a well head to a well bottom; the pipe diameters of the oil pipe I and the oil pipe II are the same and are connected through a safety joint; the hydraulic anchor and the packer I are arranged outside the oil pipe II; the throttler is connected with the bottom end of the oil pipe II; the pipe diameters of the oil pipe III and the oil pipe II are the same, the top end of the oil pipe III is connected with the throttler, and the bottom end of the oil pipe III is connected with the ball seat; and the packer II is arranged outside the oil pipe III.
Furthermore, a grease layer is coated between the safety joint and the oil pipe I and between the safety joint and the oil pipe II.
Furthermore, the specification of the oil pipe I, the specification of the oil pipe II and the specification of the oil pipe III are 89mm, the specification of the throttleer is 40mm, and the specification of the ball seat is 40 mm.
The utility model discloses following beneficial effect has:
the utility model discloses reform transform purpose coal seam to different positions provides two kinds of fracturing tubular columns. When the transformation target coal bed is located at the lowest part of the historical fracturing layer, the adopted fracturing pipe column comprises an oil pipe I, a safety joint, a hydraulic anchor, a packer I, an oil pipe II and a flow controller which are sequentially connected from a well mouth to a well bottom, the hydraulic anchor and the packer I are sealed and isolated between the transformation target coal bed and the lowest historical fracturing layer, and then the transformation target coal bed is fractured. When reforming transform the purpose coal seam and be located between two-layer historical fracturing layer, the fracturing tubular column of adoption includes by well head to shaft bottom connected gradually oil pipe I, safety joint, hydraulic anchor, packer I, oil pipe II, flow controller, oil pipe III, packer II and ball seat, and hydraulic anchor and packer I are located and reform transform purpose coal seam top, and packer II is located and reforms transform purpose coal seam below, seals to reforming transform the annular space in purpose coal seam place and separates, then carries out the fracturing to reforming transform the purpose coal seam. After the fracturing pipe column is adopted, the yield increasing effect is obviously improved.
Drawings
FIG. 1 is a schematic illustration of the installation of a fracturing string as described in example 1;
FIG. 2 is a schematic illustration of the installation of the fracturing string described in example 2;
FIG. 3 is a preferred plot of XS-1 well fracture modification zone for example 3.
In the figure: 1-an oil pipe I; 2-a safety joint; 3-a hydraulic anchor; 4-packer I; 5-oil pipe II; 6-a restrictor 6; 7-oil pipe III; 8-packer II; 9-a ball seat; 101-surface casing; 102-producing a casing; 103-artificial well bottom; 104-reforming a target coal seam; 105-historical fracturing layer.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
The embodiment provides a fracturing string for transforming an old well with multi-coal-bed and short-interval coal bed gas, which comprises an oil pipe I1, a safety joint 2, a hydraulic anchor 3, a packer I4, an oil pipe II 5 and a restrictor 6 which are sequentially connected from a well head to a well bottom; the pipe diameters of the oil pipe I1 and the oil pipe II 5 are the same and are connected through a safety joint 2; the hydraulic anchor 3 and the packer I4 are arranged outside the oil pipe II 5; the throttler 6 is connected with the bottom end of the oil pipe II 5.
Furthermore, a grease layer is coated between the safety joint 2 and the oil pipe I1 and the oil pipe II 5, so that sealing is guaranteed.
Furthermore, the specification of the oil pipe I1 and the specification of the oil pipe II 5 are 89mm, and the specification of the throttler 6 is 40 mm.
When the reconstruction target coal seam 104 is located at the lowest part of the historical fracturing layer 105, the hydraulic anchor 3 and the packer I4 are lowered to the position between the reconstruction target coal seam 104 and the lowest historical fracturing layer for packing, and then the reconstruction target coal seam is fractured.
Example 2
The embodiment provides a fracturing string for transforming an old well with multi-coal-bed and short-interval coal bed gas, which comprises an oil pipe I1, a safety joint 2, a hydraulic anchor 3, a packer I4, an oil pipe II 5, a flow controller 6, an oil pipe III 7, a packer II 8 and a ball seat 9 which are sequentially connected from a well head to a well bottom; the pipe diameters of the oil pipe I1 and the oil pipe II 5 are the same and are connected through a safety joint 2; the hydraulic anchor 3 and the packer I4 are arranged outside the oil pipe II 5; the throttler 6 is connected with the bottom end of the oil pipe II 5; the pipe diameters of the oil pipe III 7 and the oil pipe II 5 are the same, the top end of the oil pipe III is connected with the throttler 6, and the bottom end of the oil pipe III is connected with the ball seat 9; and the packer II 8 is arranged outside the oil pipe III 7.
Furthermore, a grease layer is coated between the safety joint 2 and the oil pipe I1 and the oil pipe II 5, so that sealing is guaranteed.
Furthermore, the specification of the oil pipe I1, the specification of the oil pipe II 5 and the specification of the oil pipe III 7 are 89mm, the specification of the throttleer 6 is 40mm, and the specification of the ball seat 9 is 40 mm.
When transforming purpose coal seam 104 and being located between two-layer historical fracturing layer 105, hydraulic anchor 3 and packer I4 are located and transform purpose coal seam 104 top, and packer II 8 is located and transforms purpose coal seam 104 below, seals the annular space that transforms purpose coal seam 104 place and separates, then carries out the fracturing to transforming purpose coal seam 104.
Example 3
The capacity of the old well in the ancient traffic block is reduced, and the applicant carries out technical transformation for many times, but the transformation effect is very little. In 2015, the Tungan mine two coal-bed gas wells are subjected to secondary fracturing modification, and the modification idea is as follows: the fractured layer is subjected to secondary fracturing repeatedly, the fracturing construction is smooth in the transformation process, but the gas production effect is not ideal; the radial well technology and the plasma pulse blockage removal technology are tested in 2018, and the yield increase effect is not obvious after modification, so that the large-scale popularization is not performed.
By analyzing geological conditions of the ancient-handed blocks, a modification scheme for the ancient-handed block coal-bed gas well is made according to the characteristics of a multi-coal-bed and a short-layer distance (the layer distance is within 20 meters) of the Tungan mine. The selection of the target horizon is no longer with the coal seam (historical fracturing layer 105) that has been fractured before, through carrying out fracturing transformation to the adjacent layer (transformation target coal seam 104), not only can release new horizon coal bed gas output, because the distance is nearer, can carry out pressure disturbance to the coal seam (historical fracturing layer 105) that has already fractured simultaneously, makes the coal bed gas in its reservoir further release. However, the conventional fracturing string is difficult to adapt to the reconstruction scheme, so the applicant designs the fracturing string for reconstructing the old well with the multi-coal-seam and short-interval coal-bed gas described in the embodiment 1 and the embodiment 2.
Taking an XS-1 well as an example, the well is completed by a casing, the original fracturing layer positions are No. 2 coal beds and No. 8 coal beds, and 02#, No. 4 coal beds and No. 9 coal beds are selected for the target layer position of the transformation, because the No. 2 coal bed is positioned above the No. 4 coal bed, the No. 8 coal bed is positioned above the No. 9 coal bed, and the No. 2 coal bed and the No. 8 coal bed are already fractured (the casing has leakage), the No. 4 coal bed and the No. 9 coal bed can not be fractured by injecting light casing, so that the oil pipes are selected for fracturing; and the 02# coal seam is positioned above the 2# coal seam, and no casing leakage exists above the 02# coal seam, so that the fracturing can be injected by adopting a light casing with larger displacement. The concrete construction steps are as follows.
And 9# coal seam fracturing:
1) dredging a well: judging the intact condition of the casing, detecting the encountered resistance depth and pulling out the drifting tubular column;
2) scraping: scraping the whole well section, particularly repeatedly scraping the upper 10m and the lower 10m of the coal seam section for more than 5 times.
3) And (3) alternate spraying and well washing: the pump truck is used for pumping 20m3 of 0.5 percent KCL water, the well is washed for 2 to 3 weeks with large discharge, and the outlet is qualified when clear water is found.
4) Sand blasting and perforating: and connecting an oil pipe with 89mm to a sand blaster, putting the sand blaster into a target coal seam, carrying out sand blasting and perforating operation, controlling the sand blasting and perforating discharge capacity to be about 4 m/min, and adopting quartz sand with 40/70 meshes. And ensuring that the sand blasting perforation time is not less than 20min and the cycle time is not less than 40 min.
5) And (3) fracturing a pipe column into a well:
the No. 9 coal seam is positioned at the bottommost part, so that the fracturing string structure is (from bottom to top): 1 choke, 1 packer, a hydraulic anchor, a safety joint and 89mm oil pipes to a wellhead;
the well-descending pipe column must be carefully checked and accurately measured, a new oil pipe is used, the strength requirement of the safety joint is qualified, and the screw thread is coated with sealing grease for tightening, so that the phenomenon that the well-descending pipe column is stabbed and does not leak is guaranteed.
6) And (3) pressure testing: the pressure test of the ground pipeline and the gate is 45MPa, and the ground pipeline and the gate are qualified without puncture and leakage within 5 minutes.
7) And (3) fracturing construction: and carrying out construction according to the designed pump injection program, and controlling the construction discharge capacity to be 6 m/min. And measuring the pressure drop for 60min after fracturing is finished, performing open flow according to design requirements after the pressure drop is measured, and performing next layer construction after the open flow is finished.
4# coal seam fracturing:
1) and (3) alternate spraying and well washing: the pump truck is used for pumping 20m3 of 0.5 percent KCL water, the well is washed for 2 to 3 weeks with large discharge, and the outlet is qualified when clear water is found.
2) Sand blasting and perforating: and connecting an oil pipe with 89mm to a sand blaster, putting the sand blaster into a target coal seam, carrying out sand blasting and perforating operation, controlling the sand blasting and perforating discharge capacity to be about 4 m/min, and adopting quartz sand with 40/70 meshes. And ensuring that the sand blasting perforation time is not less than 20min and the cycle time is not less than 40 min.
3) And (3) fracturing a pipe column into a well:
the No. 4 coal seam is positioned at the bottommost part, so that the fracturing string structure is (from bottom to top): 40mm ball seat + packer +40mm flow controller + 1 of 89mm oil pipe + packer + hydraulic anchor + safety joint +89mm oil pipe to well head.
The pipe column must be carefully checked and accurately measured, the new oil pipe is used, the strength requirement of the variable-thread joint is qualified, and the screw thread is coated with sealing grease for tightening, so that the pipe column is ensured not to be pierced and not to leak and continuously take off.
4) And (3) pressure testing: the pressure test of the ground pipeline and the gate is 45MPa, and the ground pipeline and the gate are qualified without puncture and leakage within 5 minutes.
5) And (3) fracturing construction: and carrying out construction according to the designed pump injection program, and controlling the construction discharge capacity to be 6 m/min. And measuring the pressure drop for 60min after fracturing is finished, performing open flow according to design requirements after the pressure drop is measured, and performing next layer construction after the open flow is finished.
02# coal seam fracturing:
1) and (3) alternate spraying and well washing: the pump truck is used for pumping 20m3 of 0.5 percent KCL water, the well is washed for 2 to 3 weeks with large discharge, and the outlet is qualified when clear water is found.
2) Sand blasting and perforating: and connecting an oil pipe with 89mm to a sand blaster, putting the sand blaster into a target coal seam, carrying out sand blasting and perforating operation, controlling the sand blasting and perforating discharge capacity to be about 4 m/min, and adopting quartz sand with 40/70 meshes. And ensuring that the sand blasting perforation time is not less than 20min and the cycle time is not less than 40 min.
3) And (3) fracturing construction:
because the 02# coal seam is above the 2# coal seam and there is no casing loss above the 02# coal seam, a larger displacement optical casing injection fracturing can be used. (the lower coal seam is sealed by a fishable bridge plug).
And (4) carrying out construction according to a designed pump injection program, and controlling construction discharge capacity to be 8 m/min during fracturing of the optical sleeve. And measuring the pressure drop for 60min after fracturing is finished, and performing open flow according to design requirements after the pressure drop is measured.
And carrying out 15 m/d and 0.24MPa casing pressure on the XS-1 well before transformation, carrying out 36-day drainage and mining after transformation, wherein the gas yield is stable, 1008 m/d and 0.56MPa is carried out on the daily gas yield, and compared with the method before transformation, the gas yield is increased by 840 m/d, and the gas yield increment after transformation is obvious.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (6)
1. A fracturing pipe column for transforming an old well with multiple coal beds and short-distance coal bed gas is characterized by comprising an oil pipe I, a safety joint, a hydraulic anchor, a packer I, an oil pipe II and a restrictor which are sequentially connected from a well head to a well bottom;
the pipe diameters of the oil pipe I and the oil pipe II are the same, and the oil pipe I and the oil pipe II are connected through a safety joint;
the hydraulic anchor and the packer I are arranged outside the oil pipe II;
and the throttler is connected with the bottom end of the oil pipe II.
2. The fracturing string for improving the old well of multi-coal-seam short-interval coal-bed gas as claimed in claim 1, wherein a grease layer is coated between the safety joint and the oil pipe I and the oil pipe II.
3. The fracturing string for old well improvement of multi-coal-seam short-interval coal-bed gas as claimed in claim 1 or 2, wherein the specification of the oil pipe I and the oil pipe II is 89mm, and the specification of the choke is 40 mm.
4. A fracturing pipe column for transforming an old well with multi-coal-bed and short-interval coal-bed gas is characterized by comprising an oil pipe I, a safety joint, a hydraulic anchor, a packer I, an oil pipe II, a flow controller, an oil pipe III, a packer II and a ball seat which are sequentially connected from a well mouth to a well bottom;
the pipe diameters of the oil pipe I and the oil pipe II are the same, and the oil pipe I and the oil pipe II are connected through a safety joint;
the hydraulic anchor and the packer I are arranged outside the oil pipe II;
the throttler is connected with the bottom end of the oil pipe II;
the pipe diameters of the oil pipe III and the oil pipe II are the same, the top end of the oil pipe III is connected with the throttler, and the bottom end of the oil pipe III is connected with the ball seat;
and the packer II is arranged outside the oil pipe III.
5. The fracturing string for improving the old well of multi-coal-seam short-interval coal-bed gas as claimed in claim 4, wherein a grease layer is coated between the safety joint and the oil pipe I and the oil pipe II.
6. The fracturing string for old well improvement of multi-coal-seam short-interval coal bed methane according to claim 4 or 5, wherein the specifications of the oil pipe I, the oil pipe II and the oil pipe III are 89mm, the specification of the throttler is 40mm, and the specification of the ball seat is 40 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120733882.8U CN215057297U (en) | 2021-04-12 | 2021-04-12 | Fracturing string for reforming old well with multiple coal seams and short bed interval coal bed gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120733882.8U CN215057297U (en) | 2021-04-12 | 2021-04-12 | Fracturing string for reforming old well with multiple coal seams and short bed interval coal bed gas |
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