An integrated tool for open-hole fishbone stimulation and screen completion

Abstract

The present invention relates to the technical field of marine oil and gas resources and offshore natural gas hydrate exploitation equipment, and in particular to an integrated tool for fishbone production enhancement and screen completion of open-hole wells, which can complete measures such as reservoir transformation, sand prevention, and production string lowering with only one trip of drilling, causes less damage to the reservoir, greatly reduces operating costs, optimizes construction procedures, reduces the implementation of complex procedures, shortens operating time, improves economic and technical indicators of offshore natural gas hydrate exploitation, accelerates the industrialization process, and improves practicality and reliability; a fishbone branch short section, a sand retaining medium and an outer protective cover, wherein the sand retaining medium is installed on the outer wall of the fishbone branch short section.

Description

Technical Field

[0001] The invention relates to the technical field of marine oil and gas resources and offshore natural gas hydrate production equipment, and in particular to an open-hole well fishbone stimulation and screen tube completion integrated tool. Background Art

[0002] As we all know, with the successful implementation of the second round of offshore natural gas hydrate trial production, my country has become the first country in the world to use horizontal well drilling technology to test offshore natural gas hydrates, and has taken another important step in promoting industrialization. my country's offshore natural gas hydrate resources are huge, but how to maximize the production capacity of gas wells and maintain efficient and stable production is a major problem currently faced. The use of reservoir stimulation technology can achieve the purpose of connecting the formation and the wellbore, increase the exposed area of ​​the production layer, and improve production capacity. At the same time, it is necessary to combine effective sand control methods to prevent the adverse effects of reservoir sand production.

[0003] Conventional fracturing and perforating processes have many disadvantages, such as fracturing fluids are prone to damage reservoirs, there are a lot of chemical additives in the construction fluid, which are easy to cause environmental pollution, long construction period, multiple tripping and lowering of pipes, and high operating costs. The multi-branch fishbone open hole completion technology uses hydraulic rock breaking to form multiple branch small wellbores in the horizontal well section of the reservoir, increasing the exposed area and leakage channels of the reservoir, and a large number of microcracks will be formed in the hole area due to the "hydraulic pressure holding" effect, which can connect more fracture systems and greatly improve the seepage capacity near the wellbore; the gas flows directly into the wellbore radially along the wellbore, which improves the gas well production capacity and recovery rate. It is a typical application of jet production enhancement technology, replacing the technical measures such as casing, cementing, perforating, and fracturing in conventional operations, reducing construction links, and reducing operational risks and operating costs.

[0004] Mechanical screen pipe sand control is one of the most widely used sand control methods. The sand control screen pipe is suspended at the bottom of the well directly opposite the production layer to allow fluid to pass through and block the formation sand. The mechanical screen pipe sand control process technology is simple and easy to construct, but there are problems such as thin sand blocking layer and easy invasion and blockage of fine sand, resulting in production not meeting expectations. Especially for hydrate reservoirs with high mud content, the formation sand is extremely fine, and the sand blocking performance and flow performance of the screen pipe are often not taken into account at the same time, so it must be combined with reservoir transformation process technology.

[0005] Although the fishbone production enhancement technology is widely used in oil and gas fields, it has not been applied to hydrate reservoirs. Conventional storage, modification and sand control processes require multiple trips to the string for related procedures, which is complex to construct. The high daily cost of offshore operations is far from meeting the economic requirements for industrialization effects. Therefore, it is necessary to optimize and innovate to form integrated completion tools for storage, modification and sand control to significantly reduce offshore operation time, reduce operating costs, improve the economic and technical indicators of offshore natural gas hydrate exploitation, and accelerate the industrialization process. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an integrated tool for open-hole well fishbone production increase and screen completion, which can complete reservoir transformation, sand control, and production tubing installation in just one trip, causing less damage to the reservoir, greatly reducing operating costs, optimizing construction procedures, reducing the implementation of complex procedures, shortening operating time, improving economic and technical indicators of offshore natural gas hydrate exploitation, accelerating the industrialization process, and improving practicality and reliability.

[0007] The invention discloses an integrated tool for increasing production of fishbone in open hole wells and completing wells with screen tubes, comprising a fishbone branch short section, a sand retaining medium and an outer protective cover, wherein the sand retaining medium is installed on the outer wall of the fishbone branch short section, and the outer protective cover is installed on the outer wall of the sand retaining medium, and the fishbone branch short section, the sand retaining medium and the outer protective cover are all tubular.

[0008] The present invention discloses an integrated tool for increasing the production of fishbone in open hole wells and completing wells with screen pipes. A plurality of groups of branch pipes are installed in the fishbone branch short section. One end of the plurality of branch pipes is sealed and fixed to the power end inside the fishbone branch short section, and the other end can move according to the designed trajectory and extend to the outside of the fishbone branch short section.

[0009] The present invention provides an integrated tool for increasing the production of fishbone in open hole wells and completing wells with screen tubes, wherein the number of the plurality of branch pipes may be 3-4.

[0010] The invention discloses an integrated tool for fishbone stimulation and screen completion of open hole wells. The fishbone branch sub is different from a conventional fishbone branch pipe in that it does not contain a production valve and is a non-perforated pipe.

[0011] The invention discloses an integrated tool for increasing the production of fishbone in open-hole wells and completing wells with screen tubes. Multiple groups of one-way valves are evenly inlaid on the outer wall of the fishbone branch short section, and the multiple groups of one-way valves are all connected with the inside of the fishbone branch short section.

[0012] The invention discloses an integrated tool for increasing the production of fishbone in open-hole wells and completing wells with screen pipes. The sand retaining medium can be one of a multi-layer filter screen, metal wool, a new type of metal foam, and a gap-type material.

[0013] The present invention provides an integrated tool for increasing the production of fishbone spurs in open-hole wells and completing wells with screens. The outer protective cover can be of a bridge type, a slotted type, a wire-wound type, or a precision composite type.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1) Combining the fishbone stimulation technology with the screen sand control technology, only one tool needs to be put in to achieve two benefits: the fishbone stimulation technology can achieve effective communication with the reservoir, and avoid the complex process of reservoir modification measures such as hydraulic fracturing and perforating, reduce the damage to the hydrate reservoir, and make the construction simpler; the preferred mechanical sand control screen can deal with the sanding of fine sand in the hydrate reservoir, effectively prevent the migration of formation sand, and maintain efficient and stable production of gas wells.

[0016] 2) It can complete measures such as reservoir transformation, sand control, and production string installation in just one trip, causing less damage to the reservoir, greatly reducing operating costs, optimizing construction procedures, reducing complex procedures, shortening operating time, improving the economic and technical indicators of offshore natural gas hydrate exploitation, and accelerating the industrialization process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure of the short segment of the spur branch of the fish;

[0019] Markings in the attached figure: 1. fishbone branch short section; 2. sand retaining medium; 3. outer protective cover; 4. one-way valve. DETAILED DESCRIPTION

[0020] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0021] like Figure 1 to Figure 2 As shown, an integrated tool for fishbone production enhancement and screen completion of open hole wells of the present invention comprises a fishbone branch short section 1, a sand retaining medium 2 and an outer protective cover 3, the sand retaining medium 2 is installed on the outer wall of the fishbone branch short section 1, and the outer protective cover 3 is installed on the outer wall of the sand retaining medium 2, the fishbone branch short section 1, the sand retaining medium 2 and the outer protective cover 3 are all tubular; the fishbone branch short section 1 can be used as a base pipe to support the sand retaining medium 2 and the outer protective cover 3, the sand retaining medium 2 can block the formation sand to prevent it from entering the inside of the fishbone branch short section 1 and the wellbore, and the outer protective cover 3 can play a role in fluid diversion, which is convenient for protecting the sand retaining medium 2 and at the same time slowing down the sand and gravel erosion equipment.

[0022] The present invention provides an integrated tool for fishbone stimulation and screen completion of open hole wells, wherein a plurality of groups of branch pipes are installed in the fishbone branch short section 1, one end of the plurality of branch pipes is sealed and fixed to the internal power end of the fishbone branch short section 1, and the other end can move according to the designed trajectory and extend to the outside of the fishbone branch short section 1.

[0023] The present invention provides an integrated tool for increasing the production of fishbone in open hole wells and completing wells with screen tubes, wherein the number of the plurality of branch pipes may be 3-4.

[0024] The invention discloses an integrated tool for fishbone stimulation and screen completion of open hole wells. The fishbone branch sub 1 is different from a conventional fishbone branch pipe in that it does not contain a production valve and is a non-perforated pipe.

[0025] The present invention provides an integrated tool for increasing the production of open-hole fishbone spurs and completing screen wells. Multiple groups of one-way valves 4 are evenly inlaid on the outer wall of the fishbone branch short section 1, and the multiple groups of one-way valves 4 are all connected to the inside of the fishbone branch short section 1.

[0026] In the integrated tool for increasing the production of fishbone in open-hole wells and completing wells with screen tubes of the present invention, the sand retaining medium 2 can be one of a multi-layer filter screen, metal wool, a new type of metal foam, and a gap-type material.

[0027] In the integrated tool for increasing fishbone production and completing wells with screens for open-hole wells of the present invention, the outer protective cover 3 can be of a type selected from the group consisting of a bridge type, a slotted type, a wire-wound type, and a precision composite type.

[0028] The present invention provides an integrated tool for increasing the production of open-hole fishbone spurs and completing screen wells. The outer surface of the fishbone branch short section 1 is 90 degrees in one direction and is divided into four groups. Each group can be provided with 4-6 one-way valves 4.

[0029] The present invention provides an integrated tool for increasing the production of fishbone spurs and completing wells in open-hole wells. When working, multiple groups of equipment are spliced ​​end to end to form a tube bundle, and the tube bundle is lowered into the wellbore to a specified depth. High-pressure fluid is pumped into the tube bundle from the top of the tube bundle, and the high-pressure fluid enters the fishbone branch short section 1 and pushes the multiple groups of branch pipes thereon to move according to a set trajectory and extend into the formation outside the fishbone branch short section 1. Multiple groups of one-way valves 4 can block the fluid in the fishbone branch short section 1 to prevent it from flowing into the formation through the sand retaining medium 2 and the outer protective cover 3. After the branch pipes are moved and extended, the lowering of the tube bundle is completed. During subsequent production, the formation fluid enters the one-way valve 4 through the annular gap between the fishbone branch short section 1 and the sand retaining medium 2, and then enters the short section 1 to be mined to the ground.

[0030] The main functions achieved by the present invention are: the tool can complete measures such as reservoir transformation, sand control, and production string lowering in just one trip, causing less damage to the reservoir, greatly reducing operating costs, optimizing construction procedures, reducing the need for complex procedures, shortening operating time, improving economic and technical indicators for offshore natural gas hydrate exploitation, and accelerating the industrialization process.

[0031] The integrated tool for increasing fishbone production and screen completion in an open hole well of the present invention has common mechanical installation, connection or setting methods, and can be implemented as long as the beneficial effects can be achieved.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An integrated tool for fishbone stimulation and screen completion in open hole wells, characterized in that: The fishbone branch short section (1), the sand retaining medium (2) and the outer protective cover (3), wherein the sand retaining medium (2) is mounted on the outer wall of the fishbone branch short section (1), and the outer protective cover (3) is mounted on the outer wall of the sand retaining medium (2), and the fishbone branch short section (1), the sand retaining medium (2) and the outer protective cover (3) are all tubular; The fishbone branch short section (1) is provided with a plurality of branch tubes, one end of which is sealed and fixed to the internal power end of the fishbone branch short section (1), and the other end of which can move according to a designed trajectory and extend to the outside of the fishbone branch short section (1); The number of the plurality of branch pipes may be 3-4; The herringbone branch short section (1) is different from a conventional herringbone branch pipe in that it does not contain a production valve and is a non-perforated pipe. A plurality of groups of one-way valves (4) are evenly inlaid on the outer wall of the fishbone branch short section (1), and the plurality of groups of one-way valves (4) are all connected to the inside of the fishbone branch short section (1).

2. The open hole well fishbone stimulation and screen completion integrated tool according to claim 1, characterized in that: The sand retaining medium (2) may be one of a multi-layer filter screen, metal wool, a new type of metal foam, and a gap-type material.

3. The open hole well fishbone stimulation and screen completion integrated tool according to claim 1, characterized in that: The outer protective cover (3) may be of a type selected from the group consisting of a bridge type, a slit type, a wire-wound type, and a precision composite type.

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