Method and device for acquiring shape of deformed section of casing pipe

Abstract

The invention relates to the technical field of casing detection, in particular to a casing deformation section shape obtaining method and device.The casing deformation section shape obtaining method comprises the following steps that firstly, the casing deformation section shape obtaining device is put into a well; and 2, the casing deformation section shape obtaining device is tripped into the deformation position of the underground casing, and tripping is stopped after resistance is encountered. The device is reasonable and compact in structure and convenient to operate, the device for obtaining the shape of the deformation section of the casing pipe is lowered to the deformation position of the casing pipe, printing is conducted at certain drilling pressure after resistance is met, under the drilling pressure effect, the inner pipe and the outer pipe expand and extrude the inner wall of the deformed casing pipe, and therefore three-dimensional marks are formed; the casing deformation section shape obtaining device is pulled out of a well mouth, and the size of the casing deformation section shape obtaining device is observed and measured, so that the shape and the size of the casing deformation section are obtained, the deformation condition of the whole casing deformation section can be displayed in a three-dimensional mode, and a more complete and more real basis is provided for casing shaping work.

Description

Technical Field

[0001] This invention relates to the field of casing detection technology, and is a method and apparatus for obtaining the shape of a deformed section of a casing. Background Technology

[0002] Currently, the main methods for detecting the degree of deformation at the deformed part of the sleeve include lead stamping, pen tip testing, and 40-arm measurement. Lead stamping technology can only reflect the condition of the sleeve at the point where the stamping encounters resistance, and cannot truly reflect the overall condition of the entire deformed section of the sleeve. 40-arm measurement has the problem of high cost. Summary of the Invention

[0003] This invention provides a method and apparatus for obtaining the shape of the deformed section of a casing, which overcomes the shortcomings of the prior art. It can effectively solve the problems of existing casing deformation degree detection methods, which cannot truly reflect the overall situation of the entire deformed section of the casing and are costly.

[0004] One of the technical solutions of the present invention is achieved through the following measures: a method for obtaining the shape of a sleeve deformation section, comprising the following steps: Step 1: Lower the casing deformation section shape acquisition device downhole; Step 2: The casing deformation section shape acquisition device is lowered into the deformed part of the casing downhole and the lowering is stopped when it encounters resistance. Step 3: Inject workover fluid into the casing deformation section shape acquisition device and apply a certain drilling pressure. After the casing deformation section shape acquisition device is deformed, it is squeezed against the deformed inner wall of the casing and forms a three-dimensional imprint. Step 4: Remove the device for obtaining the shape of the deformed section of the casing; Step 5: Measure the dimensions of the deformed section of the sleeve after deformation using the device.

[0005] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions: In step three above, the applied drilling pressure shall not exceed 40 kN.

[0006] The second technical solution of the present invention is achieved by the following measures: a sleeve deformation section shape acquisition device, comprising an inner tube and an outer tube, wherein the outer side of the inner tube and the inner side of the outer tube are fixedly installed together.

[0007] The following are further optimizations and / or improvements to the second technical solution of the above invention: The outer side of the inner tube can be tightly fitted onto the inner side of the outer tube.

[0008] The outer side of the inner tube can be tightly fitted onto the inner side of the outer tube by heat fitting. The inner and outer tubes are heat-fitted after being heated to a temperature of not less than 100 degrees Celsius.

[0009] This invention features a reasonable and compact structure and is easy to operate. The casing deformation section shape acquisition device is lowered to the deformation point of the casing. Upon encountering resistance, it prints the shape using a certain drilling pressure. Under the drilling pressure, the inner and outer tubes expand and press against the deformed inner wall of the casing, thus forming a three-dimensional imprint. After printing, the casing deformation section shape acquisition device is pulled out of the wellhead. The dimensions of the device are observed and measured, thereby obtaining the shape and size of the casing deformation section. The deformation of the entire casing deformation section can be displayed in a three-dimensional form, providing a more complete and realistic basis for casing shaping work. Attached Figure Description

[0010] Appendix Figure 1 This is a schematic diagram of the front cross-sectional structure of the preferred embodiment of the present invention.

[0011] Appendix Figure 2 This is a top sectional view of the preferred embodiment of the present invention.

[0012] Appendix Figure 3 This is a schematic diagram of the cross-sectional structure when used in the preferred embodiment of the present invention.

[0013] The codes in the attached diagram are as follows: 1 represents the inner tube, and 2 represents the outer tube. Detailed Implementation

[0014] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0015] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0016] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1 , 2 As shown in Figure 3, the method for obtaining the shape of the deformed section of the sleeve includes the following steps: Step 1: Lower the casing deformation section shape acquisition device downhole; Step 2: The casing deformation section shape acquisition device is lowered into the deformed part of the casing downhole and the lowering is stopped when it encounters resistance. Step 3: Inject workover fluid into the casing deformation section shape acquisition device and apply a certain drilling pressure. After the casing deformation section shape acquisition device is deformed, it is squeezed against the deformed inner wall of the casing and forms a three-dimensional imprint. Step 4: Remove the device for obtaining the shape of the deformed section of the casing; Step 5: Measure the dimensions of the deformed section of the sleeve after deformation using the device.

[0017] The casing deformation section shape acquisition device is lowered to the deformation point of the casing. After encountering resistance, it prints the shape with a certain drilling pressure. Under the action of drilling pressure, the inner tube 1 and the outer tube 2 expand and squeeze against each other with the deformed inner wall of the casing, thus forming a three-dimensional imprint. After printing, the casing deformation section shape acquisition device is pulled out of the wellhead. The size of the casing deformation section shape acquisition device is observed and measured, thereby obtaining the shape and size of the casing deformation section. The deformation of the entire casing deformation section can be displayed in a three-dimensional form, providing a more complete and realistic basis for casing shaping work.

[0018] The above method for obtaining the shape of the deformed section of the casing can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above example, in step 3, the applied drilling pressure is no more than 40KN.

[0019] During use, this can prevent excessive drilling pressure from causing secondary damage to the casing deformation area, which could lead to casing wall damage, cracking, or breakage.

[0020] Example 3: As shown in the attached document Figure 1 , 2 As shown, the sleeve deformation section shape acquisition device includes an inner tube 1 and an outer tube 2, with the outer side of the inner tube 1 and the inner side of the outer tube 2 fixedly installed together.

[0021] In order to determine the three-dimensional shape of the casing deformation when the downhole casing deforms, the casing deformation section shape acquisition device is lowered to the deformation site. After encountering resistance, it prints the shape with a certain drilling pressure. Under the action of drilling pressure, the inner tube 1 and outer tube 2 deform and expand locally, squeezing against the deformed casing to produce a three-dimensional imprint. After printing, the casing deformation section shape acquisition device is pulled out of the wellhead. By observing and measuring the size of the casing deformation section shape acquisition device, the deformation of the inner tube 1 and outer tube 2 can be used to determine the deformation of the downhole casing, thus achieving the effect of casing printing and obtaining the shape of the casing deformation section.

[0022] The above-mentioned casing deformation section shape acquisition device can be further optimized and / or improved according to actual needs: Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, the outer side of the inner tube 1 is tightly fitted onto the inner side of the outer tube 2.

[0023] During use, this setup allows the inner tube 1 and the outer tube 2 to form a whole. By reducing the wall thickness of the inner tube 1 and the outer tube 2, the strength and toughness of the sleeve deformation section shape acquisition device are improved, making it easier to acquire the shape of the sleeve deformation section.

[0024] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, the outer side of the inner tube 1 is tightly fitted onto the inner side of the outer tube 2 by heat fitting. The inner tube 1 and the outer tube 2 are heat-fitted after being heated to a temperature of not less than 100 degrees Celsius.

[0025] During use, this setup allows two types of steel pipes to expand fully using the principle of thermal expansion and contraction, quickly assembling the inner pipe 1 and the outer pipe 2 to form an overlapping structure. When the temperature returns to normal, the inner pipe 1 and the outer pipe 2 tightly hug each other, forming a composite pipe effect. This can improve the strength and toughness of the casing deformation section shape acquisition device.

[0026] The above technical features constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A method for obtaining the shape of a sleeve deformation section, characterized in that... The steps include the following: Step 1: Lower the casing deformation section shape acquisition device downhole; Step 2: The casing deformation section shape acquisition device is lowered into the downhole casing deformation area and stopped after encountering resistance. Step 3: Inject workover fluid into the casing deformation section shape acquisition device and apply a certain drilling pressure. After the casing deformation section shape acquisition device is deformed, it is squeezed against the deformed inner wall of the casing and forms a three-dimensional imprint. Step 4: Remove the device for obtaining the shape of the deformed section of the casing; Step 5: Measure the dimensions of the deformed section of the sleeve after deformation using the device.

2. The method for obtaining the shape of the deformed section of the casing according to claim 1, characterized in that... In step three, the applied drilling pressure shall not exceed 40 kN.

3. A casing deformation section shape acquisition device according to the casing deformation section shape acquisition method according to claim 1 or 2, characterized in that... It includes an inner tube and an outer tube, with the outer side of the inner tube and the inner side of the outer tube fixedly installed together.

4. The sleeve deformation section shape acquisition device according to claim 3, characterized in that... The inner tube is tightly fitted onto the inner side of the outer tube.

5. The sleeve deformation section shape acquisition device according to claim 4, characterized in that... The inner tube is tightly fitted onto the outer tube via heat fitting. The inner and outer tubes are heat-fitted after being heated to a temperature of not less than 100 degrees Celsius.

Images