A method for quickly judging the degree of casing deformation and handling it by pumping soluble balls

Abstract

The present invention discloses a method for quickly judging the degree of casing deformation and handling by pumping soluble balls, and relates to the technical field of complex identification and handling of oil and gas well engineering. The present invention counts the minimum inner diameter range of the horizontal well casing after deformation in the volume fracturing reconstruction construction block, and takes the inner diameter value with the largest proportion as the maximum outer diameter value of the soluble metal ball; according to the outer diameter difference of 5mm~10mm, a variety of soluble metal balls with through holes corresponding to perforating guns with different outer diameter specifications are designed in sequence; soluble metal balls with outer diameter specifications from small to large are lowered in sequence, and the change of wellhead pressure value is observed to determine the inner diameter of the casing deformation, and the corresponding specifications of the perforating gun temporary plugging balls and bridge plugs are lowered to complete the formation segmentation. The present invention also provides a method of formation segmentation and cluster perforation for casing deformation sections with different deformation degrees, which improves the success rate, timeliness and safety of bridge-perforation operations in casing deformation wells.

Description

Technical Field

[0001] The present invention relates to the technical field of complex identification and treatment of oil and gas well engineering, and is particularly applicable to the technical field of bridge plug and perforation combination of unconventional oil and gas horizontal wells. More specifically, it relates to a method for quickly identifying the degree of casing deformation and treating it by pumping soluble balls. Background Art

[0002] The horizontal well volume fracturing transformation technology is a key technology for the development of unconventional oil and gas resources with low porosity and low permeability, such as shale oil and gas, tight oil and gas, and bridge-plug perforation (hereinafter referred to as bridge-shooting) is an important link. Bridge-shooting refers to the use of cable transportation to transport the bridge-shooting tool string to the target location downhole through hydraulic pumping under the premise of effective communication between the wellbore and the formation, first completing the bridge plug setting and realizing the formation segmentation, and then completing multi-cluster perforation to form a channel connecting the reservoir and the wellbore. However, during the horizontal well bridge-shooting process, deformation of the cementing casing is often encountered, resulting in obstruction or jamming of the bridge-shooting tool string pumping, affecting the smooth implementation of the entire horizontal well volume fracturing transformation.

[0003] At present, in order to ensure the construction progress and transformation effect, the horizontal well volume fracturing transformation mainly follows the following principles: cable is preferred, followed by continuous tubing to achieve bridge plug setting and cluster perforation, because the former has a faster delivery speed and higher operating efficiency; at the same time, large-size perforating guns are preferred for cluster perforation, because their perforation depth is deeper and the perforation diameter is larger, which is more conducive to improving the fracturing transformation effect. Therefore, when the bridge-shooting joint operation encounters casing deformation, it is usually necessary to first try to pump a tool string with the same outer diameter. If it passes through the casing deformation smoothly, continue to use this method; if it still cannot pass through the casing deformation, continue to replace the pumping tool string with a smaller outer diameter and try again. This method is not only inefficient, but also has a certain degree of blindness, which can easily lead to the bridge-shooting joint operation tool string being blocked / stuck due to casing deformation. In severe cases, the stuck tool string cannot be normally removed, resulting in complex engineering. Summary of the invention

[0004] In order to overcome the defects and shortcomings in the above-mentioned prior art, the present invention provides a method for quickly determining the degree of casing deformation and handling by pumping soluble balls. The purpose of the present invention is to solve the problem that blindly attempting to pump a tool string when the casing is deformed easily leads to complex engineering. The present invention aims to provide a method for quickly determining the degree of casing deformation by pumping soluble balls and corresponding handling measures, so as to improve the success rate, timeliness and safety of casing deformation well bridge shooting operations.

[0005] In order to solve the above problems existing in the prior art, the present invention is implemented through the following technical solutions.

[0006] The present invention provides a method for quickly judging the degree of casing deformation and handling it by pumping soluble balls, the method comprising the following steps:

[0007] S1. Count the minimum inner diameter range of the horizontal well casing after deformation in the volume fracturing reconstruction construction block, and take the inner diameter value with the largest proportion as the maximum outer diameter value of the soluble metal ball;

[0008] S2. According to the outer diameter difference of 5mm~10mm, various soluble metal balls with through holes corresponding to perforating guns with different outer diameter specifications are designed in sequence;

[0009] S3. Pull out the bridge-shooting tool string from the wellbore that cannot pass through the casing deformation;

[0010] S4, first put the soluble metal ball with the smallest outer diameter among the multiple soluble metal balls with through holes designed in step S2 into the wellbore, pump the well fluid steadily at a set displacement, and push the soluble metal ball with the smallest outer diameter in the wellbore forward; at the same time, record the wellhead pressure value after the stable pumping; when the wellhead pressure value rises by 1MPa or more than the wellhead pressure value when the pumping is stable, it is determined that the soluble metal ball with the smallest outer diameter cannot pass through the deformation of the casing, and the smallest inner diameter of the casing after deformation is smaller than the outer diameter of the soluble metal ball with the smallest outer diameter; otherwise, it is determined that the soluble metal ball with the smallest outer diameter has successfully passed through the deformation of the casing;

[0011] S5. When the soluble metal ball with the smallest outer diameter passes smoothly through the deformation of the casing, various soluble metal balls with larger outer diameters than the soluble metal ball with the smallest outer diameter are tried to be placed and pumped into the wellbore in sequence; until the soluble metal ball with the largest outer diameter passes smoothly through the deformation of the casing, a perforating gun and a bridge plug with the corresponding specifications of the soluble metal ball with the largest outer diameter are used to perform bridge-perforating joint construction;

[0012] During this period, when any of the soluble metal balls with multiple outer diameters cannot pass through the deformation of the casing, the bridge-shooting wellhead equipment is directly dismantled and replaced with a continuous tubing wellhead equipment. The continuous tubing is used to transport the perforating gun with the corresponding outer diameter of the soluble metal balls that can pass through the deformation of the casing to perform perforating operations, and the bridge plug is used to complete the formation segmentation.

[0013] Furthermore, the method further comprises step S6, wherein the step S6 specifically comprises: after completing the casing deformation and the deep well section according to the operation of step S5, entering into the bridge-shooting joint operation process under normal well conditions.

[0014] Furthermore, in step S5, when there is no bridge plug of corresponding specifications to complete the formation segmentation, a temporary plugging ball of corresponding specifications is used to complete the formation segmentation.

[0015] In the step S2, at least four types of soluble metal balls with outer diameters of 5 mm to 10 mm are designed in sequence, namely type A, type B, type C and type D, wherein type A soluble metal ball has the smallest outer diameter.

[0016] In step S4, the set displacement is 10 m 3 / min ~14m 3 / min.

[0017] Furthermore, when the 89mm perforating gun and the 99mm bridge plug tool string encounter resistance during pumping, the casing is deformed at the resistance point, and the minimum inner diameter at the point where 90% of the casing is deformed is ≥92mm. Four types of soluble metal balls with outer diameters are designed, namely, 70mm outer diameter soluble metal balls, 80mm soluble metal balls, 85mm soluble metal balls and 92mm soluble metal balls.

[0018] Furthermore, when 70mm soluble metal balls are pumped and the wellhead pressure rises by ≥1MPa, the minimum inner diameter of the casing deformation is ≤70mm, and a 51mm perforating gun and temporary plugging balls are used for perforation and segmented treatment.

[0019] Furthermore, when 80mm soluble metal balls are pumped and the wellhead pressure rises by ≥1MPa, the minimum inner diameter of the casing deformation is greater than 70mm and less than or equal to 80mm, and a 60mm perforating gun and temporary plugging balls are used for perforating and segmented treatment.

[0020] Furthermore, when 85mm soluble metal balls are pumped and the wellhead pressure rises by ≥1MPa, the minimum inner diameter of the casing deformation is greater than 80mm and less than or equal to 85mm, and a 73mm perforating gun and temporary plugging balls are used for perforating and segmented treatment.

[0021] Furthermore, when pumping 92mm soluble metal balls and the wellhead pressure rises by ≥1MPa, the minimum inner diameter of the casing deformation is greater than 85mm and less than or equal to 92mm, and an 80mm perforating gun and 83mm bridge plug are used for perforation and segmented treatment.

[0022] Compared with the prior art, the beneficial technical effects brought by the present invention are as follows:

[0023] The present invention not only provides a low-cost, simple and rapid method for determining the degree of casing deformation, but also provides a method for formation segmentation and cluster perforation for casing deformation well sections with different degrees of deformation, thereby improving the success rate, timeliness and safety of casing deformation well bridge perforation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 Flow chart for pumping soluble metal balls into well Y in block X to quickly identify casing deformation and its treatment. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings of the present invention specification to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1

[0028] As a preferred embodiment of the present invention, this embodiment discloses a method for quickly determining the degree of casing deformation and handling by pumping soluble balls, the method comprising the following steps:

[0029] S1. Count the minimum inner diameter range of the horizontal well casing after deformation in the volume fracturing reconstruction construction block, and take the inner diameter value with the largest proportion as the maximum outer diameter value of the soluble metal ball;

[0030] S2. According to the outer diameter difference of 5mm~10mm, various soluble metal balls with through holes corresponding to perforating guns with different outer diameter specifications are designed in sequence;

[0031] S3. Pull out the bridge-shooting tool string from the wellbore that cannot pass through the casing deformation;

[0032] S4, first put the soluble metal ball with the smallest outer diameter among the multiple soluble metal balls with through holes designed in step S2 into the wellbore, pump the well fluid steadily at a set displacement, and push the soluble metal ball with the smallest outer diameter in the wellbore forward; at the same time, record the inlet pressure value after the stable pumping; when the wellhead pressure value rises by 1MPa or more than the wellhead pressure value when the pumping is stable, it is determined that the soluble metal ball with the smallest outer diameter cannot pass through the deformation of the casing, and the smallest inner diameter of the casing after deformation is smaller than the outer diameter of the soluble metal ball with the smallest outer diameter; otherwise, it is determined that the soluble metal ball with the smallest outer diameter has successfully passed through the deformation of the casing;

[0033] S5. When the soluble metal ball with the smallest outer diameter passes smoothly through the deformation of the casing, various soluble metal balls with larger outer diameters than the soluble metal ball with the smallest outer diameter are tried to be placed and pumped into the wellbore in sequence; until the soluble metal ball with the largest outer diameter passes smoothly through the deformation of the casing, a perforating gun and a bridge plug with the corresponding specifications of the soluble metal ball with the largest outer diameter are used to perform bridge-perforating joint construction;

[0034] During this period, when any of the soluble metal balls with multiple outer diameters cannot pass through the deformation of the casing, the bridge-shooting wellhead equipment is directly dismantled and replaced with a continuous tubing wellhead equipment. The continuous tubing is used to transport the perforating gun with the corresponding outer diameter of the soluble metal balls that can pass through the deformation of the casing to perform perforating operations, and the bridge plug is used to complete the formation segmentation.

[0035] Example 2

[0036] As another preferred embodiment of the present invention, this embodiment discloses a method for quickly determining the degree of casing deformation and handling by pumping soluble balls, the method comprising the following steps:

[0037] S1. Count the minimum inner diameter range of the horizontal well casing after deformation in the volume fracturing reconstruction construction block, and take the inner diameter value with the largest proportion as the maximum outer diameter value of the soluble metal ball;

[0038] S2. According to the outer diameter difference of 5mm~10mm, various soluble metal balls with through holes corresponding to perforating guns with different outer diameter specifications are designed in sequence;

[0039] S3. Pull out the bridge-shooting tool string from the wellbore that cannot pass through the casing deformation;

[0040] S4, first put the soluble metal ball with the smallest outer diameter among the multiple soluble metal balls with through holes designed in step S2 into the wellbore, pump the well fluid steadily at a set displacement, and push the soluble metal ball with the smallest outer diameter in the wellbore forward; at the same time, record the inlet pressure value after the stable pumping; when the wellhead pressure value rises by 1MPa or more than the wellhead pressure value when the pumping is stable, it is determined that the soluble metal ball with the smallest outer diameter cannot pass through the deformation of the casing, and the smallest inner diameter of the casing after deformation is smaller than the outer diameter of the soluble metal ball with the smallest outer diameter; otherwise, it is determined that the soluble metal ball with the smallest outer diameter has successfully passed through the deformation of the casing;

[0041] S5. When the soluble metal ball with the smallest outer diameter passes smoothly through the deformation of the casing, various soluble metal balls with larger outer diameters than the soluble metal ball with the smallest outer diameter are tried to be placed and pumped into the wellbore in sequence; until the soluble metal ball with the largest outer diameter passes smoothly through the deformation of the casing, a perforating gun and a bridge plug with the corresponding specifications of the soluble metal ball with the largest outer diameter are used to perform bridge-perforating joint construction;

[0042] During this period, when any of the soluble metal balls of various outer diameters cannot pass through the deformation of the casing, the bridge-shooting wellhead equipment is directly dismantled and replaced with a coiled tubing wellhead equipment, and the coiled tubing is used to transport the perforating gun with the corresponding outer diameter of the soluble metal balls that can pass through the deformation of the casing to perform perforating operations, and the bridge plug is used to complete the formation segmentation; when there is no bridge plug of the corresponding specification to complete the formation segmentation, the temporary plugging ball of the corresponding specification is used to complete the formation segmentation;

[0043] S6. After completing the operation of the casing deformation area and the deep well section according to the operation of step S5, enter the bridge-shooting joint operation process under normal well conditions.

[0044] Example 3

[0045] As another preferred embodiment of the present invention, this embodiment discloses a method for quickly determining the degree of casing deformation and handling by pumping soluble balls, the steps are as follows:

[0046] S1. Count the minimum inner diameter range of the horizontal well casing after deformation in the volume fracturing reconstruction construction area, and take the inner diameter value with the largest proportion as the maximum outer diameter value of the soluble metal ball.

[0047] S2. According to the outer diameter difference of 5mm~10mm, type A, type B, type C and type D soluble metal balls with through holes corresponding to different specifications of perforating guns are designed in sequence, among which type A soluble metal ball has the smallest outer diameter.

[0048] S3. Pull out the bridge-shooting tool string from the wellbore that cannot pass through the casing deformation.

[0049] S4. First, place the type A soluble metal ball with the smallest outer diameter into the wellbore, and pump the well fluid steadily at the maximum displacement to push the soluble metal ball in the well forward; at the same time, record the wellhead pressure value after the pumping is stable. When the wellhead pressure value rises by 1MPa or more than the wellhead pressure value when the pumping is stable, it is determined that the type A soluble metal ball with the smallest outer diameter cannot pass through the deformation of the casing, and the smallest inner diameter of the casing after deformation is smaller than the outer diameter of the type A soluble metal ball; otherwise, it is determined that the type A soluble metal ball with the smallest outer diameter has successfully passed through the deformation of the casing.

[0050] S5. When type A soluble metal balls successfully pass through the deformation of the casing, try to place and pump type B, C, and D soluble metal balls with larger outer diameters into the wellbore in turn, until the soluble metal ball with the largest outer diameter successfully passes through the deformation of the casing, then use the perforating gun and bridge plug of the corresponding specifications of the soluble metal ball to perform bridge-shooting joint construction; during this period, when type A, type B, type C, and type D soluble metal balls cannot pass through the deformation of the casing, directly dismantle the bridge-shooting joint wellhead equipment and replace it with continuous tubing wellhead equipment, use continuous tubing to transport the perforating gun of the corresponding specifications of type A, type B, type C, and type D soluble metal balls for perforating operations, and use bridge plugs (if there are no bridge plugs of corresponding specifications, use temporary plugging balls) to complete the formation segmentation.

[0051] S6. After completing the operation of the casing deformation area and the deep well section according to the operation of step S5, enter the bridge-shooting joint operation process under normal well conditions.

[0052] Example 4

[0053] As another preferred embodiment of the present invention, refer to the attached specification Figure 1 This embodiment discloses a method for quickly determining the degree of casing deformation and handling by pumping soluble balls, comprising the following steps:

[0054] According to Table 1, the minimum inner diameter range of the horizontal well casing after deformation in the volume fracturing stimulation in Block X was calculated (5-1 / 2” casing, inner diameter φ114.3 mm).

[0055] Table 1 Statistics of the minimum inner diameter range of horizontal well casing after volume fracturing in Block X

[0056] Inner diameter range <φ92mm φ92mm~φ102mm φ102mm~φ108mm ≥φ108mm Proportion 10% 30% 28% 32%

[0057] From the analysis of Table 1, it can be seen that the minimum inner diameter of 90% of the casing deformation in Block X is ≥φ92mm, so this inner diameter value is taken as the maximum outer diameter value of the soluble ball.

[0058] According to Table 2, φ70mm (type A), φ80mm (type B), φ85mm (type C), and φ92mm (type D) soluble balls with through holes are designed in turn corresponding to perforating guns of different specifications.

[0059] Table 2 Pumping soluble balls and treatment perforating guns and segmentation methods for casing deformation horizontal wells in Block X

[0060]

[0061] The "φ89mm perforating gun + φ99mm bridge plug" bridge-shooting tool string that could not pass through the casing deformation was pulled out from the Y wellbore in the X block, and it was determined that the minimum inner diameter of the casing after deformation was less than φ99mm.

[0062] Step 5: Place a soluble ball with a minimum outer diameter of φ70 mm into the wellbore at a rate of 10 to 14 m. 3 / min displacement pumps the well fluid steadily to push the soluble ball in the well forward; meanwhile, record the wellhead pressure value after the pumping is stable. When the wellhead pressure value rises by 1MPa or more than the wellhead pressure value when the pumping is stable, it is determined that the φ70mm soluble ball cannot pass through the casing deformation, and the minimum inner diameter of the casing after deformation is less than φ70mm. Therefore, the treatment measures taken are: directly dismantle the bridge-shooting wellhead equipment and replace it with a continuous tubing wellhead equipment, use continuous tubing to transport a φ51mm perforating gun for perforation, and throw a pump to temporarily plug the ball to complete the formation segmentation and fracturing. After completing the construction of the casing deformation and the deeper well section according to the treatment measures, finally turn to the bridge-shooting process under normal well conditions.

[0063] When the wellhead pressure value of pumping φ70mm soluble ball does not change compared with the wellhead pressure value when pumping steadily, it is determined that the φ70mm soluble ball has successfully passed through the casing deformation, and the minimum inner diameter of the casing after deformation is greater than φ70mm, so continue to try to put and pump the φ80mm soluble ball with a larger outer diameter into the wellbore. When the wellhead pressure value rises by 1MPa or more compared with the wellhead pressure value when pumping steadily, it is determined that the φ80mm soluble ball cannot pass through the casing deformation, and the minimum inner diameter of the casing after deformation is between φ70mm and φ80mm. Therefore, the disposal measures taken are: directly dismantle the bridge-shooting wellhead equipment and replace it with a continuous tubing wellhead equipment, use continuous tubing to transport a φ60mm perforating gun for perforation, and throw a pump to temporarily plug the ball to complete the formation segmentation and fracturing. After completing the construction of the casing deformation and the deeper well section according to this disposal measure, finally turn to the bridge-shooting process under normal well conditions.

[0064] When the wellhead pressure value of pumping φ80mm soluble ball does not change compared with the wellhead pressure value when pumping steadily, it is determined that the φ80mm soluble ball has successfully passed through the deformation of the casing, and the minimum inner diameter of the casing after deformation is greater than φ80mm, so continue to try to put and pump the φ85mm soluble ball with a larger outer diameter into the wellbore. When the wellhead pressure value rises by 1MPa or more compared with the wellhead pressure value when pumping steadily, it is determined that the φ85mm soluble ball cannot pass through the deformation of the casing, and the minimum inner diameter of the casing after deformation is between φ80mm and φ85mm. Therefore, the disposal measures taken are: directly dismantle the bridge-shooting wellhead equipment and replace it with a continuous tubing wellhead equipment, use continuous tubing to transport a φ73mm perforating gun for perforation, and throw a pump to temporarily plug the ball to complete the formation segmentation and fracturing. After completing the construction of the casing deformation and the deeper well section according to this disposal measure, finally turn to the bridge-shooting process under normal well conditions.

[0065] When the wellhead pressure value of pumping φ85mm soluble ball does not change compared with the wellhead pressure value when pumping steadily, it is determined that the φ85mm soluble ball has successfully passed through the casing deformation, and the minimum inner diameter of the casing after deformation is greater than φ85mm, so continue to try to put and pump the φ92mm soluble ball with a larger outer diameter into the wellbore. When the wellhead pressure value rises by 1MPa or more compared with the wellhead pressure value when pumping steadily, it is determined that the φ92mm soluble ball cannot pass through the casing deformation, and the minimum inner diameter of the casing after deformation is between φ85mm and φ92mm. Therefore, the disposal measures taken are: directly dismantle the bridge-shooting wellhead equipment and replace it with a continuous tubing wellhead equipment, use a continuous tubing to transport the "φ80mm perforating gun + φ83mm bridge plug" tool string for perforation and formation segmentation, and then perform fracturing. After completing the construction of the casing deformation and the deeper well section according to this disposal measure, finally turn to the bridge-shooting process under normal well conditions.

[0066] When the wellhead pressure value of pumping φ92mm soluble ball does not change compared with the wellhead pressure value when pumping is stable, it is determined that the φ92mm soluble ball has successfully passed through the casing deformation, and the minimum inner diameter of the casing after deformation is greater than φ92mm and less than φ99mm. Therefore, the treatment measures taken are: continue to use the bridge-shot wellhead equipment and process for operation, and the well tool string is "φ80mm perforating gun + φ88mm bridge plug", and then complete the perforation and formation segmentation, as well as fracturing. After completing the construction of the casing deformation and the deeper well section according to this treatment measure, finally turn to the bridge-shot process under normal well conditions.

Claims

1. A method for quickly judging the degree of casing deformation and handling by pumping soluble balls, characterized in that: The method comprises the following steps: S1. Count the minimum inner diameter range of the horizontal well casing after deformation in the volume fracturing reconstruction construction block, and take the inner diameter value with the largest proportion as the maximum outer diameter value of the soluble metal ball; S2. According to the outer diameter difference of 5mm~10mm, various soluble metal balls with through holes corresponding to perforating guns with different outer diameter specifications are designed in sequence; S3. Pull out the bridge-shooting tool string from the wellbore that cannot pass through the casing deformation; S4, first put the soluble metal ball with the smallest outer diameter among the multiple soluble metal balls with through holes designed in step S2 into the wellbore, pump the well fluid steadily at a set displacement, and push the soluble metal ball with the smallest outer diameter in the wellbore forward; at the same time, record the inlet pressure value after the stable pumping; when the wellhead pressure value rises by 1MPa or more than the wellhead pressure value when the pumping is stable, it is determined that the soluble metal ball with the smallest outer diameter cannot pass through the deformation of the casing, and the smallest inner diameter of the casing after deformation is smaller than the outer diameter of the soluble metal ball with the smallest outer diameter; otherwise, it is determined that the soluble metal ball with the smallest outer diameter has successfully passed through the deformation of the casing; S5. When the soluble metal ball with the smallest outer diameter passes smoothly through the deformation of the casing, various soluble metal balls with larger outer diameters than the soluble metal ball with the smallest outer diameter are tried to be placed and pumped into the wellbore in sequence; until the soluble metal ball with the largest outer diameter passes smoothly through the deformation of the casing, a perforating gun and a bridge plug with the corresponding specifications of the soluble metal ball with the largest outer diameter are used to perform bridge-perforating joint construction; During this period, when any of the soluble metal balls with multiple outer diameters cannot pass through the deformation of the casing, the bridge-shooting wellhead equipment is directly dismantled and replaced with a continuous tubing wellhead equipment. The continuous tubing is used to transport the perforating gun with the corresponding outer diameter of the soluble metal balls that can pass through the deformation of the casing to perform perforating operations, and the bridge plug is used to complete the formation segmentation.

2. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 1, characterized in that: The process further includes step S6, which specifically includes: after the casing deformation and the deeper well section are processed according to the operation of step S5, the process is transferred to the bridge-shooting joint operation process under normal well conditions.

3. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 1 or 2, characterized in that: In step S5, when there is no bridge plug of corresponding specifications to complete the formation segmentation, a temporary plugging ball of corresponding specifications is used to complete the formation segmentation.

4. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 1 or 2, characterized in that: In the step S2, at least four types of soluble metal balls with outer diameters of 5 mm to 10 mm are designed in sequence, namely type A, type B, type C and type D, wherein type A soluble metal ball has the smallest outer diameter.

5. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 1 or 2, characterized in that: In step S4, the set displacement is 10 m 3 / min ~14m 3 / min.

6. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 1 or 2, characterized in that: When the 89mm perforating gun and 99mm bridge plug tool string encounter resistance during pumping, the casing will deform at the resistance point. If the minimum inner diameter at the point where 90% of the casing is deformed is ≥92mm, four types of soluble metal balls with different outer diameters are designed, namely, 70mm soluble metal balls, 80mm soluble metal balls, 85mm soluble metal balls and 92mm soluble metal balls.

7. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 6, characterized in that: When pumping 70mm soluble metal balls and the wellhead pressure rises ≥1MPa, the minimum inner diameter of the casing deformation is ≤70mm, and a 51mm perforating gun and temporary plugging balls are used for perforation and segmented treatment.

8. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 6, characterized in that: When 80mm soluble metal balls are pumped and the wellhead pressure rises by ≥1MPa, the minimum inner diameter of the casing deformation is greater than 70mm and less than or equal to 80mm. In this case, a 60mm perforating gun and temporary plugging balls are used for perforating and segmented treatment.

9. A method for quickly determining the degree of casing deformation and handling by pumping soluble balls as claimed in claim 6, characterized in that: When 85mm soluble metal balls are pumped and the wellhead pressure rises by ≥1MPa, the minimum inner diameter of the casing deformation is greater than 80mm and less than or equal to 85mm. In this case, a 73mm perforating gun and temporary plugging balls are used for perforation and segmented treatment.

10. A method for quickly determining casing deformation and handling by pumping soluble balls as claimed in claim 6, characterized in that: When pumping 92mm soluble metal balls and the wellhead pressure rises by ≥1MPa, the minimum inner diameter of the casing deformation is greater than 85mm and less than or equal to 92mm. In this case, an 80mm perforating gun and an 83mm bridge plug are used for perforating and segmented treatment.

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