Small-size casing pipe inner closed type suspension intelligent flow regulation and water control pipe column and installation method

Abstract

The invention discloses a small-size casing pipe inner closed type suspension intelligent flow adjusting and water controlling pipe column which comprises a tank body, the outer diameter of the widest position of the tank body is smaller than 140 mm, at least one end of the tank body is provided with an adapter substitute, a control cable and an electric submersible pump unit are arranged in the tank body, at least one annular groove is formed in the outer wall of the tank body, and the control cable is connected with the electric submersible pump unit through the annular groove. An annular groove is formed in the tank body, rectangular lock teeth are formed in the positions, at the two ends of the annular groove, of the tank body respectively, the outer wall of the tank body is sleeved with a pipeline protection device, the pipeline protection device is arranged in the annular groove, and the pipeline protection device is matched with the rectangular lock teeth. The invention further provides an installation method of the small-size casing pipe inner closed type suspended intelligent flow adjusting and water controlling pipe column. The intelligent flow adjusting and water controlling tubular column is simple in structure, convenient in material obtaining and processing, low in cost, simple in installation method, rapid and convenient in field operation, good in application prospect and capable of being widely applied to intelligent development of offshore small-liquid-amount oil fields.

Description

Technical Field

[0001] The present application relates to the technical field of oil exploration and development drilling and completion, and in particular to a small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column, and an installation method thereof. Background Art

[0002] At present, canned systems are widely used at sea, and the technology is mature. There are mainly two types of products in 9.625-inch and 7-inch casings. The canned pump system includes: tank body, lifting short circuit, electric pump docking suspension device, submersible electric pump unit, fixed cap, conversion short section, bottom connector, external tank protector. Gradually promote the intelligent segmented flow control and water completion technology. Because the eastern oil fields generally have a large amount of liquid production (2000-3000 cubic meters / day), the implementation of this technology needs to cooperate with the canned pump system to realize the lower intelligent segmented flow control column suspension and control pipeline protection.

[0003] The outside of the tank of the canned pump system needs to be equipped with cable protection cards, resulting in a larger overall size. After the installation of a conventional 7.625-inch canned pump system, the overall outer diameter is 214-216mm. After the installation of a conventional 5.5-inch canned pump system, the outer diameter is 155-156mm, while the inner diameter of the 7-inch casing is 157mm. The gap is too small. When the pipe string combined with the intelligent segmented flow control and water control process is lowered into the casing, there is a high risk of encountering obstruction. The control pipeline cannot be protected, which will reduce the overall quality of the construction work. At present, the canned system can only be lowered in a 9.625-inch casing, which cannot meet the conditions for implementing the segmented flow control and water control process in a 7-inch casing.

[0004] Therefore, in view of the existing technical defects, in order to meet the drilling and completion operations of oil field development where electric pumps are generally located in 7-inch casing, it is necessary to develop a closed-type suspended intelligent flow control water pipe column and installation method in a small-sized casing. Summary of the invention

[0005] In order to solve one of the technical problems existing in the prior art, the present application provides a small-size casing internal closed-type suspended intelligent flow-regulating water pipe column and an installation method.

[0006] According to some embodiments of the present application, a closed-type suspended intelligent flow-control water pipe column in a small-size casing is provided, including a tank body, wherein the outer diameter of the widest part of the tank body is less than 140 mm, a conversion joint is provided at at least one end of the tank body, a control cable and a submersible electric pump unit are provided in the tank body, and the outer wall of the tank body is provided with at least one annular groove, and the tank body is respectively provided with rectangular locking teeth at both ends of the annular groove, and the outer wall of the tank body is provided with a pipeline protection device, and the pipeline protection device is arranged in the annular groove, and the pipeline protection device cooperates with the rectangular locking teeth.

[0007] In some embodiments, the outer diameter of the tank body is between 135 mm and 140 mm.

[0008] In some embodiments, after the pipeline protection device is installed, the maximum outer diameter of the tank body and the pipeline protection device is less than 152 mm.

[0009] In some embodiments, the length of the tank is 5m or 8m.

[0010] In some embodiments, the conversion joint is a conversion buckle between the tank body and the oil pipe.

[0011] In some embodiments, the tank body is connected to a suspension assembly via the conversion joint.

[0012] In some embodiments, the control cable is a plastic-encapsulated all-in-one pipeline.

[0013] In some embodiments, the submersible electric pump unit is a small-sized submersible electric pump unit, and the submersible electric pump unit is suspended inside the tank.

[0014] In some embodiments, a protective short section is provided on the tank body.

[0015] In addition, the present application also provides a method for installing a closed-type suspended intelligent flow-regulating water pipe column in a small-size casing, comprising the following steps:

[0016] Step 1: For the well section to be completed, select the corresponding closed suspension protection system according to the reservoir characteristics, wellbore structure design, mud barrier conditions and production allocation data, and determine the combination of liquid / electric control type or combined type intelligent flow control water pipe column through calculation;

[0017] Step 2, according to the scheme determined in step 1, select a suitable small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column, the small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column is the small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column as described in any one of claims 1 to 9;

[0018] Step 3: Run the intelligent flow control water inner pipe string, install the closed suspension protection system, measure the outer diameter of the protection system, and test the signal of the downhole intelligent flow control device;

[0019] Step 4: According to the precise position of the segmented intelligent flow control water outer pipe string, the length of the pipe string is matched, the production annulus packer and tubing hanger are lowered in sequence, and the control cable is made to cross, the pipe string is lowered into place, the established segment is completed, the packer is set, and the wellhead and production process are installed.

[0020] The beneficial effects of the present application are as follows: a closed-type suspension intelligent flow-regulating water control pipe column in a small-sized casing of the present application is matched with a rectangular lock tooth through a pipeline protection device to reduce the outer diameter of the tank body, so that the maximum outer diameter of the tank body meets the requirements of small size, and can realize the joint application of a closed upper production pipe column and a liquid / electrically controlled lower intelligent flow-regulating water control pipe column in a 7-inch casing, solving the problem of incompatibility between electric pump machine production and intelligent flow-regulating water control in the drilling and completion operations of the current offshore oil and gas field development. The installation method of the closed suspension intelligent flow-regulating water control pipe column in a small-sized casing of the present application can also meet the intelligent water control completion requirements of a small wellbore of 7-inch casing + 6-inch horizontal open hole, realize intelligent injection and production monitoring and regulation, and at the same time, through fine stratification and regulation, establish an effective displacement system to improve the development effect. The intelligent flow-regulating water control pipe column of the present application has a simple structure, convenient material processing, low cost, simple installation method, quick and convenient on-site operation, good application prospects, and can be widely used in the intelligent development of offshore small liquid oil fields.

[0021] Other features and advantages of the present application will be described in the following description, and partly become apparent from the description, or understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the present application will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show certain embodiments of the present application and should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 This is a structural schematic diagram of a small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column provided by the present application;

[0024] Figure 2 yes Figure 1 A cross-sectional view of

[0025] Figure 3 It is a schematic diagram of the installation method of the closed-type suspended intelligent flow-regulating and controlling water pipe column in a small-sized casing provided in the present application. DETAILED DESCRIPTION

[0026] The present application is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are intended to enable the present application to be better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present application are not shown or described in the specification, in order to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0027] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0028] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0029] The following is combined with Figures 1 to 3 The provided embodiments further illustrate a small-size casing internal closed-type suspended intelligent flow-regulating water pipe column and its installation method proposed in the present application.

[0030] like Figure 1 and Figure 2As shown, some embodiments of the present application provide a small-size casing internal closed-type suspended intelligent flow control water pipe column, including a tank body 100, the outer diameter of the tank body 100 is between 135mm and 140mm, and the outer diameter of the widest part of the tank body 100 is less than 140mm. A conversion joint 200 is provided at at least one end of the tank body 100, a control cable and a submersible electric pump unit are provided in the tank body 100, and at least one annular groove is provided on the outer wall of the tank body 100. Rectangular locking teeth 110 are respectively provided at both ends of the annular groove of the tank body 100, for example, 20 rectangular locking teeth 110 are provided at the end of the annular groove. A pipeline protection device 300 is sleeved on the outer wall of the tank body 100, and the pipeline protection device 300 is arranged in the annular groove. The pipeline protection device 300 cooperates with the rectangular locking teeth 110, so that after the pipeline protection device 300 is installed, the maximum outer diameter of the tank body 100 and the pipeline protection device 300 is less than 152 mm, so as to ensure that the tank body 100 can be used in combination in a 7-inch casing. The present application discloses a closed-type suspended intelligent flow-regulating and water-controlling pipe string in a small-sized casing, which cooperates with a rectangular locking tooth 110 through a pipeline protection device 300 to reduce the outer diameter of a tank body 100, so that the maximum outer diameter of the tank body 100 meets the requirement of a small size, and can realize the combined application of a closed upper production pipe string and a liquid / electrically controlled lower intelligent flow-regulating and water-controlling pipe string in a 7-inch casing, thereby solving the problem of incompatibility between electric pump mechanical production and intelligent flow-regulating and water-controlling in small-sized casings in the current drilling and completion operations of offshore oil and gas field development. In addition, the structure is streamlined, the material collection and processing are convenient, the cost is low, the installation method is simple, the on-site operation is quick and convenient, the application prospect is good, and it can be widely used in the intelligent development of offshore small liquid volume oil fields.

[0031] In some embodiments, Figure 1 and Figure 2 As shown, the length of the tank body 100 is 5 m or 8 m, and has two specifications. The tank body 100 of a suitable length can be selected for use according to actual needs.

[0032] In some embodiments, Figure 1 and Figure 2 As shown, the conversion joint 200 is a conversion buckle between the tank body 100 and the oil pipe, which can conveniently connect the tank body 100 and the oil pipe.

[0033] In some embodiments, anti-rotation blocks are respectively provided at the upper and lower ends of the pipeline protection device 300 to achieve circumferential fixation of the pipeline protection device 300 .

[0034] In some embodiments, Figure 1 and Figure 2 As shown, the tank body 100 is connected to the suspension assembly 400 via the conversion joint 200 , and the tank body 100 can be suspended inside the 7-inch casing via the suspension assembly 400 .

[0035] In some embodiments, the control cable is a plastic-sealed all-in-one pipeline. After being integrated into one, the cable structure can be optimized to reduce the occupied volume, and the cable breaking force is increased from 10KN to 20kN, thereby improving its tensile strength.

[0036] In some embodiments, the submersible electric pump unit is a small-sized submersible electric pump unit, and the submersible electric pump unit is suspended inside the tank 100 .

[0037] In some embodiments, a protective nipple 500 is disposed on the tank body 100 .

[0038] In addition, if Figure 3 As shown, the present application also provides a method for installing a closed-type suspended intelligent flow-regulating water pipe column in a small-size casing, comprising the following steps:

[0039] Step 1: For the well section to be completed, select the corresponding closed suspension protection system according to the reservoir characteristics, wellbore structure design, mud barrier conditions and production allocation data, and determine the combination of liquid / electric control type or combined type intelligent flow control water pipe column through calculation;

[0040] Step 2, according to the scheme determined in step 1, select a suitable small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column, wherein the small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column is any one of claims 1 to 9;

[0041] Step 3: Run the intelligent flow control water inner pipe string, install the closed suspension protection system, measure the outer diameter of the protection system, and test the signal of the downhole intelligent flow control device;

[0042] Step 4: According to the precise position of the segmented intelligent flow control water outer pipe string, the length of the pipe string is matched, the production annulus packer and tubing hanger are lowered in sequence, and the control cable is made to cross, the pipe string is lowered into place, the established segment is completed, the packer is set, and the wellhead and production process are installed.

[0043] In the above step 3, after the intelligent flow control water inner pipe string is lowered, a positioning bypass, an insertion seal, an electric control distributor / hydraulic control distributor / wellbore pressure control distributor, a production tubing and a round plug are set inside the intelligent flow control water inner pipe string. During this period, the pipe string is lowered steadily at a uniform speed, and the downhole electrical signals and insulation conditions are monitored.

[0044] In the above step 4, after the tubing is lowered to a predetermined depth, the through-tank and through-cable positioning seal is inserted into the top packer and the sealing tube of the sealing tube, and a certain tubing load is applied.

[0045] In the above step 4, after the pipe column is lowered into place, measure and record the insulation of the motor cable to ground and the phase-to-phase direct resistance. The three-phase direct resistance unbalance is required to be less than 2%, and the insulation to ground is greater than 2000MΩ / 1000V. After the measurement, discharge is performed with professional equipment.

[0046] The following is a detailed description of an installation method of a small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column of the present application in conjunction with an embodiment.

[0047] The physical properties of the horizontal reservoirs in an oil field in the east vary greatly, which affects the balanced utilization of the horizontal sections and leads to inconsistent advancement speeds of edge water at different well points. The intelligent segmented flow control and water control technology can alleviate the impact of physical property differences between well sections on production. A method for installing a closed-type suspended intelligent flow control and water control pipe string in a small-size casing is implemented according to the following steps:

[0048] S1. According to reservoir characteristics, mud content, wellbore structure and production allocation data, the production string type is confirmed to be a 7-inch closed-type suspended electric pump production string + intelligent segmented flow regulation string;

[0049] S2. According to the construction design plan, select and optimize a small-sized casing internal closed-type suspended intelligent flow-control water pipe column, including 5 tanks 100, 5 pipeline protection devices 300, control pipeline plastic sealing, conversion joints 200, suspension assembly 400 and submersible electric pump unit.

[0050] S3. Run the intelligent flow control water inner pipe string to the predetermined design depth, complete the pressure setting, and complete the three-stage mechanical isolation of the layer, including 1 top packer and 2 oil and water swelling packers; install the closed suspension protection system, measure the outer diameter of the protection system, and measure that the outer diameters of the 5 pipeline protection devices of the protection system are all less than 152mm, which meets the design requirements. At the same time, perform the downhole intelligent flow control device signal test;

[0051] S4. According to the precise position of the water-controlled outer tubing string for segmented intelligent flow control, the length of the tubing string is matched, the production annulus packer and tubing hanger are lowered in sequence, and the control cable is made to cross, the tubing string is lowered into place, the established segment is completed, the packer is set, and the wellhead and production process are installed.

[0052] Implementation effect: After 40 days of monitoring, the underground closed suspension protection system and the unit were well protected, the underground sensor signal was normal, and the vibration value of the unit was small (0.2G) and there was no leakage current. The signals of the three electric-controlled intelligent flow regulators in the well were normal, and the cumulative oil production was 2,600 cubic meters, with an excess of 1,000 cubic meters. The production system was efficiently adjusted after the production was put into operation.

[0053] The installation method of the closed-type suspended intelligent flow-control water pipe column in the small-size casing in this application can meet the intelligent water control and completion needs of small wells of 7-inch casing + 6-inch horizontal open hole, realize intelligent injection and production monitoring and regulation, and at the same time, through fine stratification and regulation, establish an effective displacement system to improve the development effect.

[0054] It can be understood that the above embodiments only express the preferred implementation methods of the present application, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present application; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, the above-mentioned technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present application; therefore, all equivalent changes and modifications made to the scope of the claims of the present application should fall within the scope of the claims of the present application.

Claims

1. A small-sized casing internal closed-type suspension intelligent flow control water pipe column, characterized in that: It includes a tank body, the outer diameter of the widest part of the tank body is less than 140 mm, at least one end of the tank body is provided with a conversion joint, a control cable and a submersible electric pump unit are provided in the tank body, the outer wall of the tank body is provided with at least one annular groove, the tank body is provided with rectangular locking teeth at both ends of the annular groove, the outer wall of the tank body is provided with a pipeline protection device, and the pipeline protection device is arranged in the annular groove, and the pipeline protection device is matched with the rectangular locking teeth.

2. A small-size casing internal closed-type suspension intelligent flow control water pipe column as claimed in claim 1, characterized in that: The outer diameter of the tank body is between 135 mm and 140 mm.

3. A small-size casing internal closed-type suspension intelligent flow control water pipe column as claimed in claim 2, characterized in that: After the pipeline protection device is installed, the maximum outer diameter of the tank body and the pipeline protection device is less than 152 mm.

4. A small-sized casing internal closed-type suspended intelligent flow control water pipe column as claimed in any one of claims 1 to 3, characterized in that: The length of the tank body is 5m or 8m.

5. A small-sized casing internal closed-type suspended intelligent flow control water pipe column as claimed in any one of claims 1 to 3, characterized in that: The conversion joint is a conversion buckle between the tank body and the oil pipe.

6. A small-sized casing internal closed-type suspended intelligent flow control water pipe column as claimed in claim 5, characterized in that: The tank body is connected with a suspension assembly via the conversion joint.

7. A small-sized casing internal closed-type suspended intelligent flow control water pipe column as claimed in any one of claims 1 to 3, characterized in that: The control cable is a plastic-sealed all-in-one pipeline.

8. A small-sized casing internal closed-type suspended intelligent flow control water pipe column as claimed in any one of claims 1 to 3, characterized in that: The submersible electric pump unit is a small-sized submersible electric pump unit, and the submersible electric pump unit is suspended inside the tank body.

9. A small-sized casing internal closed-type suspended intelligent flow control water pipe column as claimed in any one of claims 1 to 3, characterized in that: The tank body is provided with a protective short section.

10. A method for installing a closed-type suspended intelligent flow-control water pipe column in a small-sized casing, characterized in that: The following steps are involved: Step 1: For the well section to be completed, select the corresponding closed suspension protection system according to the reservoir characteristics, wellbore structure design, mud barrier conditions and production allocation data, and determine the combination of liquid / electric control type or combined type intelligent flow control water pipe column through calculation; Step 2, according to the scheme determined in step 1, select a suitable small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column, the small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column is the small-sized casing internal closed-type suspended intelligent flow-regulating water pipe column as described in any one of claims 1 to 9; Step 3: Run the intelligent flow control water inner pipe string, install the closed suspension protection system, measure the outer diameter of the protection system, and test the signal of the downhole intelligent flow control device; Step 4: According to the precise position of the segmented intelligent flow control water outer pipe string, the length of the pipe string is matched, the production annulus packer and tubing hanger are lowered in sequence, and the control cable is made to cross, the pipe string is lowered into place, the established segment is completed, the packer is set, and the wellhead and production process are installed.

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