Dosage form structure of fracturing transformation diverting agent

Abstract

The utility model discloses a dosage form structure of a fracturing transformation diverting agent. The dosage form structure comprises a main body and a soluble rubber coating coated outside the main body, the main body comprises a conical upper part and a hemispherical lower part; the upper part and the lower part are integrally formed; and the radius of the bottom surface of the upper part is the same as that of the lower part. The fracturing transformation diverting agent with the dosage form structure can better block perforation holes in vertical well multi-layer and horizontal well segmented multi-cluster fracturing transformation, the opening efficiency of layers / clusters is improved, fracturing fluid / proppant can enter all transformation target reservoirs in a more balanced mode, the fracturing fluid / proppant can be dissolved within controllable time, and therefore the fracturing transformation diverting agent can be used for well fracturing transformation. And the integral fracturing transformation effect of the reservoir is improved, and normal flowback and production after target well pressure are guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of unconventional oil and gas reservoir transformation, and particularly relates to a dosage form structure of a hemispherical cone head type fracturing transformation diverter agent. Background Art

[0002] With the development of unconventional oil and gas resources such as shale oil and gas, tight oil and gas, and coalbed methane, multi-layer vertical well and multi-cluster horizontal well fracturing have become key technologies for this development. However, distributed fiber optic temperature monitoring and distributed fiber optic acoustic monitoring indicate that during multi-layer vertical well and multi-cluster horizontal well fracturing, fracturing fluid preferentially enters low-resistance pathways. Perforation clusters in low-stress areas absorb more fracturing fluid, while clusters in high-stress areas absorb less or no fluid at all. This uneven fluid absorption among different layers / clusters results in over-stimulation of some layers / clusters and under-stimulation of others, failing to achieve the goal of balanced fracturing and, consequently, underachieving the desired effect of fracturing. Temporary plugging and diversion is one of the methods currently used by fracturing engineers to overcome the uneven fluid absorption of different layers / clusters. The principle is to use soluble temporary plugging materials to temporarily block the dominant channel for the fracturing fluid to enter, forcing the fracturing fluid to divert to the unopened layer / cluster, thereby evenly transforming the entire target layer. The soluble temporary plugging material dissolves within a controllable time and will not affect the return of the fracturing fluid and normal oil and gas production.

[0003] There are various types of temporary plugging materials currently used in the market, including temporary plugging balls, temporary plugging particles, temporary plugging fibers, temporary plugging knots, etc. The purpose is to temporarily block the dominant channels for the flow of fracturing fluid, increase the net pressure, force the opening of new layers / new clusters, change the flow direction of the fracturing fluid, and more evenly transform the target reservoir. Utility Model Content

[0004] The utility model is proposed to solve the problems existing in the prior art in that, during multi-layer combined fracturing of vertical wells and multi-cluster segmented fracturing of horizontal wells, the liquid and sand inflow into each layer / cluster is unbalanced, the multi-cluster cracks expand unevenly, the reservoir transformation is uneven and insufficient, the efficiency of opening the fracturing well layer / cluster is low, and ultimately the reservoir fracturing transformation is insufficient and the post-fracturing transformation effect cannot be achieved. The utility model aims to provide a dosage form structure of a hemispherical cone head type fracturing transformation diverter agent.

[0005] The utility model is realized through the following technical solutions:

[0006] A dosage form structure of a fracturing reforming diverter comprises a main body and a soluble rubber coating coated on the outside of the main body; the main body comprises a conical upper part and a hemispherical lower part; the upper part and the lower part are integrally formed.

[0007] In the above technical solution, the bottom radius of the upper portion is the same as the radius of the lower portion.

[0008] In the above technical solution, the bottom radius of the upper part and the radius of the lower part are both 4mm to 20mm.

[0009] In the above technical solution, the ratio of the height of the upper portion to the radius of the bottom surface of the upper portion is 2:1.

[0010] The beneficial effects of the utility model are:

[0011] The utility model provides a dosage form structure of a hemispherical cone head type fracturing transformation diverter agent, which can better seal the perforations in the multi-layer fracturing transformation of vertical wells and the multi-cluster fracturing transformation of horizontal wells, improve the opening efficiency of layers / clusters, and enable the fracturing fluid / proppant to enter each target reservoir more evenly and dissolve within a controllable time, thereby improving the overall fracturing transformation effect of the reservoir and ensuring normal return flow and production of the target well after fracturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the wellbore perforation holes in Example 1 of the present utility model;

[0014] Figure 3 This is a schematic diagram of the fluid inflow into the hole before the fracturing diverter agent with a hemispherical cone head structure in Example 1 of the present invention is injected;

[0015] Figure 4 This is a schematic diagram of the hemispherical cone head type fracturing diverter in Example 1 of the present invention plugging the holes after being added;

[0016] Figure 5 This is a schematic diagram of the fluid entering the hole after the fracturing diverter with a hemispherical cone head structure in Example 1 of the present invention is added;

[0017] Figure 6 This is a 6-cluster temporary plugging and fracturing construction curve for a certain section of a coalbed methane horizontal well in Example 1 of the present utility model.

[0018] in:

[0019] 1. Main body; 11. Upper part; 12. Lower part; 2. Soluble rubber coating.

[0020] For ordinary technicians in this field, other relevant drawings can be obtained based on the above drawings without any creative work. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0022] like Figure 1 As shown, a fracturing reforming diverter agent dosage form structure includes a main body 1 and a soluble rubber coating 2 coated on the outside of the main body; the main body 1 includes a conical upper part 11 and a hemispherical lower part 12; the upper part 11 and the lower part 12 are integrally formed;

[0023] The bottom radius of the upper portion 11 is the same as the radius of the lower portion 12 , and both the bottom radius of the upper portion 11 and the radius of the lower portion 12 are 4 mm to 20 mm, preferably 7.5 mm to 11 mm.

[0024] The height of the upper portion 11 is 8 mm to 40 mm, preferably 15 mm to 30 mm.

[0025] The use method of this utility model:

[0026] During the fracturing construction process, sand is added before temporary plugging and the sand is stopped before displacement. After the displacement stage, the construction displacement is reduced, and a certain amount (the amount of diverter is designed according to the number of holes) of fracturing transformation diverter with the dosage structure of the present application is put through the ground high-pressure ball-dropping pipeline. The fracturing transformation diverter is pumped at a low displacement. During the pumping process, close attention is paid to the changes in the ground construction pressure, especially when the fracturing transformation diverter is about to reach the perforation layer. If the construction pressure increases significantly while the displacement remains unchanged, it indicates that the fracturing transformation diverter has a significant effect in plugging the blasthole. Subsequently, the construction displacement is quickly increased, and at the same time, close attention is paid to the changes in the construction pressure. When the construction pressure allows, it is increased to the designed construction displacement to enter the next construction stage.

[0027] The dosage form structure of the utility model fracturing reforming diverter adopts a cone-shaped design on the upper part, which is very easy to enter the perforation hole and difficult to leave after entering; the cone structure can block different hole diameters (8mm~35mm) and irregular holes or cracks; the compressive strength of the fracturing reforming diverter with a hemispherical cone-shaped dosage form structure reaches 100MPa, and it has excellent compression and wear resistance; after entering the hole, due to the action of the internal soluble material and the outer rubber, the more it is pressed, the tighter and tighter it is, thus preventing the entry of fracturing fluid and proppant; the fracturing reforming diverter with the utility model dosage form structure has the characteristics of high sealing strength and full solubility. By effectively temporarily blocking the perforation holes that are opened first, the fracturing fluid and proppant are diverted to the perforation holes that are not effectively opened, thereby realizing effective and uniform transformation of all perforation clusters.

[0028] Example 1:

[0029] In the Shanxi Linxing Deep Coalbed Methane Exploitation Demonstration Area, the target coal seam is buried at a depth of 1950m and the reservoir temperature is 50°C. The horizontal section of a horizontal well is 1200m long and is divided into 10 sections with 45 clusters for large-scale fracturing. The designed operation displacement is 18m 3 / min, for example, a section with 6 clusters has 30 perforations in total, 5 holes in a single cluster, and the hole diameter is 12mm. Figure 2 Schematic diagram of the wellbore perforations. To ensure fractures are initiated at all six clusters of perforations in this section, a low-temperature series hemispherical cone-shaped diverter was designed for fracturing. This diverter has a 9mm lower hemisphere radius, a 9mm upper cone bottom radius, and a 25mm upper cone height. The diverter is red.

[0030] Schematic diagram of fracturing fluid entering the perforation hole before temporary plugging Figure 3 As shown in the figure, after the sand is added before temporary plugging, displacement is carried out. After the displacement stage is completed, the construction displacement is reduced to 2m 3 / min, 18 hemispherical cone-shaped fracturing diverter agents (calculated as 1.2 times the number of 3 clusters of holes) were put into the ground through the high-pressure ball-dropping pipeline, 2m 3 / min displacement pumping hemispherical cone head fracturing reforming diverter, ground construction pressure 30MPa, when pumping 1.5 times the wellbore volume of fracturing fluid, it was observed that the ground construction pressure rose rapidly from 30MPa to 35MPa. Figure 6 As shown in the figure, it shows that the hemispherical cone head type fracturing diverter has obvious effect in plugging the blasthole. Figure 4 As shown, the construction displacement is then increased to the designed construction displacement of 18m 3 / min, enter the next stage of fracturing construction, the hole fluid into the Figure 5 shown.

[0031] The applicant declares that the above is only a specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Technicians in the relevant technical field should understand that any changes or substitutions that can be easily thought of by technicians in the relevant technical field within the technical scope disclosed in the present invention fall within the protection scope and disclosure scope of the present invention.

Claims

1. A formulation structure of a fracturing reforming diverter, characterized by: The invention comprises a main body (1) and a soluble rubber coating (2) covering the outside of the main body; the main body (1) comprises a conical upper part (11) and a hemispherical lower part (12); the upper part (11) and the lower part (12) are integrally formed.

2. The formulation structure of the fracturing reforming diverter according to claim 1, characterized in that: The bottom radius of the upper portion (11) is the same as the radius of the lower portion (12).

3. The formulation structure of the fracturing reforming diverter according to claim 1, characterized in that: The bottom radius of the upper part (11) and the radius of the lower part (12) are both 4 mm to 20 mm.

4. The formulation structure of the fracturing reforming diverter according to claim 1, characterized in that: The ratio of the height of the upper portion (11) to the bottom radius of the upper portion (11) is 2:1.

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