CN111706259A - Method for solving casing deformation by sidetracking old well paste-salt section reaming unfixed well - Google Patents
Method for solving casing deformation by sidetracking old well paste-salt section reaming unfixed well Download PDFInfo
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- CN111706259A CN111706259A CN202010675605.6A CN202010675605A CN111706259A CN 111706259 A CN111706259 A CN 111706259A CN 202010675605 A CN202010675605 A CN 202010675605A CN 111706259 A CN111706259 A CN 111706259A
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- well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
Abstract
The invention relates to a method for solving casing deformation by reaming a side-drilling old well paste salt section without cementing, which comprises the following steps: performing sidetrack drilling on the old well containing the paste salt, and expanding the diameter of a borehole of a paste salt layer and a well section with a certain distance from the upper part to the lower part of the paste salt layer by using a hole expander; sending the tail pipe hanger with the top packer into a preset well depth position in the well, and realizing setting of the tail pipe hanger by pressure building; the well cementation operation leads the spaces formed by the well section below the paste-salt layer, the reaming section of the paste-salt layer, the well section above the paste-salt layer and the casing to be respectively filled with cement paste, isolation fluid and cement paste with corresponding annular volumes, thus realizing the paste-salt section; and reversely buckling and slowly lifting the drill rod and the feeding short section, opening under the action of a spring after an expansion seal stop block on the feeding short section is lifted out of a return connection barrel, then pressing a drilling tool to force a packer to expand, and finally lifting the drill rod and the feeding short section out of the well to finish operation. The invention solves the problem that the casing is squeezed and damaged by the cement salt of the side drilling of the old well through the process method of the cement salt zone reaming and cementing failure.
Description
Technical Field
The invention belongs to the technical field of oil and gas drilling, and particularly relates to a method for solving casing deformation by sidetracking old well paste salt section reaming and cementing.
Background
At present, a plurality of oil fields in China find that a rich oil-gas reservoir is buried under a thick casing cream salt layer and exploration and development are carried out. With the lapse of time, the old well seals the cream salt layer sleeve pipe and appears the crowded cover of destroying of different degrees and become, brings the heavy loss for the oil field, has seriously restricted the exploration development process of oil field.
The reason for the extrusion damage and deformation of the sleeve is as follows: (1) the gypsum rock will generate plastic flow under the action of overlying strata pressure, if the uneven ground stress of the surrounding stratum of the well is stronger, the uneven creep stress applied to the whole body of the casing after well cementation will cause the creep extrusion deformation of the casing; (2) when the well is fixed, a uniform cement sheath is not formed, the plastic flow of the stratum can apply non-uniform point load to the casing string, and the extrusion force applied to the casing string is greater than the pressure of the overlying strata, so that the high-strength casing with great extrusion resistance is deformed and even damaged.
Therefore, based on the problems, the method for solving the casing deformation of the sidetrack old well through the reaming of the cement salt section and the unbooking of the reaming section is provided, and the method has important practical significance for solving the problem that the casing deformation is damaged by squeezing the cement salt to the casing through the reaming of the cement salt section and the unbooking of the reaming section.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for solving casing deformation by reaming a cement-salt section of a sidetrack old well and cementing failure, and solves the problem that the cement-salt squeezes a casing to destroy the casing deformation.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
the method for solving casing deformation by reaming the unfixed well in the cement salt section of the sidetracking old well comprises the following steps:
performing sidetrack drilling on the old well containing the paste salt, and after drilling to a target well depth, expanding the diameter of a well bore of a paste salt layer and a well section with a certain distance from the upper part to the lower part of the paste salt layer by using a hole expander;
sending the liner hanger with the top packer into a preset well depth position in the well through a drill rod and a sending short section, throwing a ball at the well mouth, and suppressing pressure to realize setting of the liner hanger;
respectively acquiring annular volumes formed by a well section below a paste salt layer, a reaming section of the paste salt layer, a well section above the paste salt layer and a sleeve;
the well cementation operation leads the spaces formed by the well section below the paste-salt layer, the reaming section of the paste-salt layer, the well section above the paste-salt layer and the casing to be respectively filled with cement paste, isolation liquid and cement paste with corresponding annular volume;
the drilling rod and the sending short section are reversely buckled and slowly lifted, when an expansion seal stop block on the sending short section is lifted out of the back connection barrel, the expansion seal stop block is opened under the action of a spring, then the drilling tool is pressed downwards to force the packer to expand, and finally the drilling rod and the sending short section are lifted out of the well to finish the operation;
and (4) conveying the drilling tool assembly into the well and lifting the drilling tool assembly out of the well, solidifying cement paste, and enabling the paste-salt stratum to be in an unsealed state so as to release the uneven stress of the stratum.
Further, after the well is drilled to the target well depth, the diameter of the well bore of the paste salt layer and the well section with the depth of 15m above and below the paste salt layer is expanded by using a hole expander, and the hole expanding diameter is more than 1 inch.
Further, the well cementation operation enables spaces formed by the well section below the paste-salt layer, the reaming section of the paste-salt layer, the well section above the paste-salt layer and the casing to be respectively filled with cement slurry, isolation liquid and cement slurry with corresponding annular volume, and the well cementation operation comprises the following steps:
(1) firstly, a section of pad fluid is injected into the well through a drill rod and a cement injection truck;
(2) injecting cement slurry with corresponding volume into the well through a drill rod by using a cement injection truck according to the annular volume of the well section above the paste salt layer;
(3) forming an empty volume with the casing pipe according to the paste-salt reaming section, and injecting the spacer fluid with a corresponding volume into the well through the drill rod by using a cement injection truck;
(4) forming an empty volume with the casing pipe according to a well section below the paste-salt layer, and injecting cement paste with a corresponding volume into the well through the drill rod by using a cement injection vehicle;
(5) throwing a drill rod rubber plug from a wellhead casing head, and continuously pumping displacement liquid;
(6) the drill rod rubber plug moves to the short section of the casing rubber plug, the wellhead continues to pump the displacement liquid, and the drill rod rubber plug drives the casing rubber plug to continue to move downwards to displace the slurry;
(7) and the drill rod rubber plug is operated to the hoop supporting position, and the pressure is suppressed to 10MPa, so that the cementing operation is completed.
Further, the feeding drilling tool assembly comprises a drill rod, a return connection barrel, a feeding nipple, a packer, a tail pipe hanger, a casing rubber plug nipple, a tail pipe, a supporting hoop and a supporting shoe.
The invention has the advantages and positive effects that:
according to the invention, through a cement-salt layer reaming unfixed well technology, on one hand, a cement-salt layer creep space is provided to release uneven stress, so that the uneven stress is converted into even stress; on the other hand, stress concentration of point load on the casing caused by uneven cement sheath formed during well cementation is eliminated, the casing deformation prevention effect is achieved, the problem that the casing is crushed and deformed after the old well with a thick-salt layer with stronger non-average creep stress is sidetracked can be effectively solved, the investment and construction cost of block development and well drilling is reduced, the old oil field can be coiled, and yield and efficiency increase can be realized.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of a method for cementing construction by using a sidetrack old well paste salt section to ream an unfixed well and solve casing deformation provided in the embodiment of the invention;
FIG. 2 is a schematic diagram of a method for performing well cementation construction by using a sidetrack old well paste salt section to ream an unfixed well and solve casing deformation in the embodiment of the invention;
FIG. 3 is a schematic structural diagram of a drilling tool assembly for performing well cementing construction by using a method for reaming an unfixed well by using a sidetracking old well paste salt section to solve casing deformation in the embodiment of the invention;
Detailed Description
First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any single feature described or implicit in any embodiment or any single feature shown or implicit in any drawing may still be combined or subtracted between any of the features (or equivalents thereof) to obtain still further embodiments of the invention that may not be directly mentioned herein. In addition, for the sake of simplicity, the same or similar features may be indicated in only one place in the same drawing.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
The present invention will be described in detail with reference to fig. 1 to 3.
The method for solving casing deformation by reaming and cementing the cement-salt section of the sidetracking old well provided by the embodiment comprises the following steps of:
performing sidetrack drilling on the old well containing the paste salt, and after drilling to a target well depth, expanding the diameter of the well bore of a paste salt layer and a well section with a certain distance from the top to the bottom of the paste salt layer by using a hole expander, wherein in the embodiment, the diameter of the well bore of the paste salt layer and the well section with a depth of 15m from the top to the bottom of the paste salt layer is expanded by using the hole expander, the hole expander is more than 1 inch in diameter, and the adopted hole expander can be an SKKY series hole expander;
sending the liner hanger 5 with the top packer 4 into a preset well depth position in the well through a drill rod and a sending short section, throwing a ball at the well mouth, and suppressing pressure to realize setting of the liner hanger;
combining well diameter logging data, utilizing simulation calculation software, such as AnyCem software, in order to guarantee calculation accuracy, taking a unit of 1m section length as a calculation unit, respectively and finely calculating the annular volume formed by a well section 12 below a paste salt layer, a reaming section 11 of the paste salt layer, a well section 10 above the paste salt layer and a casing pipe, so as to achieve the purpose of accurately calculating the using amount of cement slurry, and respectively filling cement slurry, isolation liquid and cement slurry with corresponding annular volume into spaces formed by the well section below the paste salt layer, the reaming section of the paste salt layer, the well section above the paste salt layer and the casing pipe;
reversely buckling and slowly lifting the drill rod 1 and the feeding short section 3, opening under the action of a spring after an expansion seal stop block on the feeding short section is lifted out of the back connection barrel 2, then pressing down the drilling tool for 10-30t to force the packer 4 to expand, and finally lifting the drill rod 1 and the feeding short section 3 out of the well to finish operation;
and (4) conveying the drilling tool assembly into the well and lifting the drilling tool assembly out of the well, solidifying cement paste, and enabling the paste-salt stratum to be in an unsealed state so as to release the uneven stress of the stratum.
It should be noted that, in this embodiment, the following well section in the cement layer, the reaming section in the cement layer, and the space formed by the above well section in the cement layer and the casing are respectively filled with cement slurry, isolation fluid, and cement slurry with corresponding annular volumes, including the following steps:
(1) firstly, a section of pad fluid is injected into the well through the drill rod 1 by using a cement injection truck;
(2) injecting cement slurry with corresponding volume into the well through a drill rod by using a cement injection truck according to the annular volume of the well section above the paste salt layer;
(3) forming an empty volume with the casing pipe according to the paste-salt reaming section, and injecting the spacer fluid with a corresponding volume into the well through the drill rod by using a cement injection truck;
(4) forming an empty volume with the casing pipe according to a well section below the paste-salt layer, and injecting cement paste with a corresponding volume into the well through the drill rod by using a cement injection vehicle;
(5) throwing a drill rod rubber plug from the wellhead casing head 13, and continuously pumping displacement liquid;
(6) the drill rod rubber plug moves to the position of the short section 6 of the casing rubber plug, the wellhead continues to pump displacement liquid, and the drill rod rubber plug drives the casing rubber plug to continue to move downwards to displace slurry;
(7) and the drill rod rubber plug moves to the position of the supporting hoop 8, and the pressure is suppressed to 10MPa, so that the cementing operation is completed.
As shown in fig. 3, the running tool assembly comprises a drill pipe 1, a tieback barrel 2, a running nipple 3, a packer 4, a liner hanger 5, a casing plug nipple 6, a liner 7, a support hoop 8 and a support shoe 9; it should be noted that, during the construction, as shown in fig. 2, the position of the drill pipe 1 at the wellhead is fixedly connected with the wellhead casing head 13, it should be noted that each tool in the running drilling assembly can be made of the existing product, and the installation manner thereof is the prior art, which is well known to those skilled in the art, and does not hinder the technical reappearance of the present invention.
By the method, the hole enlargement of the paste salt layer releases non-average creep stress, the deformation of the casing pipe is prevented from being damaged by squeezing, and meanwhile, other well sections except the paste salt layer are well cemented and the packer is put in, so that double insurance of an external sealed stratum is realized, and the safety of oil and gas exploitation is ensured.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not 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 (4)
1. The method for solving casing deformation by reaming the old well cement section and cementing failure in sidetracking is characterized by comprising the following steps of: the method comprises the following steps:
performing sidetrack drilling on the old well containing the paste salt, and after drilling to a target well depth, expanding the diameter of a well bore of a paste salt layer and a well section with a certain distance from the upper part to the lower part of the paste salt layer by using a hole expander;
sending the liner hanger with the top packer into a preset well depth position in the well through a drill rod and a sending short section, throwing a ball at the well mouth, and suppressing pressure to realize setting of the liner hanger;
respectively acquiring annular volumes formed by a well section below a paste salt layer, a reaming section of the paste salt layer, a well section above the paste salt layer and a sleeve;
cementing the well by injecting cement slurry, so that cement slurry, spacer fluid and cement slurry with corresponding annular volumes are respectively filled in spaces formed by the well section below the cement layer, the reaming section of the cement layer and the casing pipe at the well section above the cement layer;
the drilling rod and the sending short section are reversely buckled and slowly lifted, when an expansion seal stop block on the sending short section is lifted out of the back connection barrel, the expansion seal stop block is opened under the action of a spring, then the drilling tool is pressed downwards to force the packer to expand, and finally the drilling rod and the sending short section are lifted out of the well to finish the operation;
and (4) conveying the drilling tool assembly into the well and lifting the drilling tool assembly out of the well, solidifying cement paste, and enabling the paste-salt stratum to be in an unsealed state so as to release the uneven stress of the stratum.
2. The method of claim 1, wherein the method comprises: and (3) after drilling to the target well depth, expanding the diameter of the well bore of the paste salt layer and the well section with the depth of 15m above and below the paste salt layer by using a hole expander, wherein the hole expanding diameter is more than 1 inch.
3. The method of claim 1, wherein the method comprises: the method comprises the following steps of filling cement paste, isolation liquid and cement paste with corresponding annular volumes into spaces formed by a well section below a paste-salt layer, a reaming section of the paste-salt layer, a well section above the paste-salt layer and a casing respectively:
(1) firstly, a section of pad fluid is injected into the well through a drill rod and a cement injection truck;
(2) injecting cement slurry with corresponding volume into the well through a drill rod by using a cement injection truck according to the annular volume of the well section above the paste salt layer;
(3) forming an empty volume with the casing pipe according to the paste-salt reaming section, and injecting the spacer fluid with a corresponding volume into the well through the drill rod by using a cement injection truck;
(4) forming an empty volume with the casing pipe according to a well section below the paste-salt layer, and injecting cement paste with a corresponding volume into the well through the drill rod by using a cement injection vehicle;
(5) throwing a drill rod rubber plug from a wellhead casing head, and continuously pumping displacement liquid;
(6) the drill rod rubber plug moves to the short section of the casing rubber plug, the wellhead continues to pump the displacement liquid, and the drill rod rubber plug drives the casing rubber plug to continue to move downwards to displace the slurry;
(7) and the drill rod rubber plug is operated to the hoop supporting position, and the pressure is suppressed to 10MPa, so that the cementing operation is completed.
4. The method of claim 1, wherein the method comprises: the feeding drilling tool assembly comprises a drill rod, a return connection barrel, a feeding short section, a packer, a tail pipe hanger, a casing rubber plug short section, a tail pipe, a supporting hoop and a supporting shoe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010675605.6A CN111706259B (en) | 2020-07-14 | 2020-07-14 | Method for solving casing deformation by sidetracking old well paste-salt section reaming unfixed well |
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| CN202010675605.6A CN111706259B (en) | 2020-07-14 | 2020-07-14 | Method for solving casing deformation by sidetracking old well paste-salt section reaming unfixed well |
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| CN111706259A true CN111706259A (en) | 2020-09-25 |
| CN111706259B CN111706259B (en) | 2022-03-08 |
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