Sand control and wireline separate zone completion method

Abstract

This disclosure relates to the field of oil and gas field development technology, and discloses a method for sand control and cabled water injection completion. The method includes: determining a cabled intelligent water injection string based on the number of layers to be injected and the length of each layer in the target well; running the cabled intelligent water injection string into the target well that has undergone layered sand control treatment; and testing and adjusting the cabled intelligent water injection string. This method can simultaneously perform sand control and cabled water injection operations on the target layer, enabling precise water injection during daily production, real-time dynamic monitoring of the target layer, and dynamic adjustment as needed, thus improving the intelligence level of well completion.

Description

Technical Field

[0001] This disclosure relates to the field of oil and gas field development technology, and in particular to a sand control and cabled injection well completion method. Background Technology

[0002] Water injection well development has become a common extraction technology in most oilfields. Currently, due to formation factors, sand production is common in injection wells. Without effective sand control measures, the water injection effect will be affected, and even the normal production and development results will be impacted.

[0003] Existing sand control technology can achieve basic sand control through injection, but it cannot achieve simultaneous sand control and cabled operation in the target water injection layer. It also cannot achieve functions such as fine allocation, real-time dynamic monitoring, and dynamic allocation according to needs, resulting in a low level of intelligence in well completion. Summary of the Invention

[0004] In view of this, this disclosure provides a method for sand control and cabled water injection completion, which can simultaneously carry out sand control and cabled water injection operations in the target water injection layer. It can achieve precise water injection in daily production, and can monitor the target water injection layer in real time and dynamically adjust according to needs, thereby improving the intelligence level of well completion.

[0005] On the one hand, this disclosure provides a method for sand control and cabled injection well completion, the method comprising:

[0006] The cable-operated intelligent injection string is determined based on the number of layers and the length of each layer in the target well.

[0007] The cabled intelligent injection string is lowered into the target well, which has already undergone stratified sand control treatment.

[0008] The cabled intelligent injection string was tested and adjusted.

[0009] In some embodiments, before determining the cabled intelligent injection string based on the number of layers and the length of each layer in the target well, the method includes:

[0010] Determine whether the target well has undergone stratified sand control treatment;

[0011] If the target well has not undergone stratified sand control treatment, the stratified sand control completion tool is determined based on the number of stratified water injection layers and the length of each layer in the target well, and the stratified sand control completion tool is then lowered into the target well.

[0012] In some embodiments, the step of running the cabled intelligent injection string into the target well, which has already undergone stratified sand control treatment, includes:

[0013] The cabled intelligent injection string is lowered into the layered sand control completion tool.

[0014] In some embodiments, the layered sand control completion tool includes a sand control string, the sand control string including a plurality of packers, and the step of inserting the layered sand control completion tool into the target well includes:

[0015] Insert the sand-proof pipe string;

[0016] Multiple packers on the sand-control pipe string are sequentially seated and verified to block formation sand.

[0017] In some embodiments, determining the cabled intelligent injection string based on the number of layers in the target well and the length of each layer includes:

[0018] Based on the number of layers for stratified water injection in the target well and the length of each layer, determine the tubing length, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of matching cables.

[0019] Based on the oil pipe length, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of matching cables, the cabled intelligent injection string is assembled.

[0020] In some embodiments, the assembly of the cabled intelligent injection string based on the tubing length, the number of intelligent water distribution cylinders, the number of cable-sealing components, and the number of matching cables includes:

[0021] Based on the oil pipe length, the number of intelligent water distribution cylinders, the number of cable-passing seals, and the number of matching cables, the oil pipes, the cable-passing seals, and the intelligent water distribution cylinders are connected sequentially according to the layer order.

[0022] Connect one end of the matching cable to the intelligent water distribution cylinder, and extend the other end from the ground.

[0023] In some embodiments, determining the tubing length, the number of intelligent water distribution cylinders, the number of cable seals, and the number of matching cables based on the number of layers in the target well for stratified water injection and the length of each layer includes:

[0024] When there are four layers of water injection in the target well, the number of intelligent water distribution cylinders, the number of cable sealing parts, and the data of the matching cables are all determined to be four.

[0025] In some embodiments, the testing and configuration of the cabled intelligent injection string includes:

[0026] Connect each of the aforementioned matching cables to the ground controller;

[0027] Start the ground controller and determine the communication status between the ground controller and each smart water distribution cylinder;

[0028] Under the condition that the communication status of each intelligent water distribution cylinder is good, the water injection data and pressure data of each layer in the target well are obtained.

[0029] In some embodiments, the method further includes:

[0030] Acquire real-time pressure data and real-time water injection data of the target well;

[0031] Based on the real-time pressure data and real-time water injection data of the target well, the real-time water injection volume for each layer is determined.

[0032] In some embodiments, the method further includes:

[0033] Based on the logging data of the target well, determine the depth of the target well, the number of layers for stratified water injection within the target well, and the length of each layer.

[0034] The beneficial effects of the technical solutions provided in this disclosure include at least the following:

[0035] This disclosure provides a sand control and cabled water injection completion method. Based on the number of water injection layers and the length of each layer in the target well, the structure of the cabled intelligent water injection string is determined. The cabled intelligent water injection string is then lowered into the target well, which has already undergone layered sand control treatment. The string is tested and adjusted to coordinate with the layered sand control for layered water injection. Because this sand control and cabled water injection completion method, based on the existing layered sand control treatment and combined with the cabled intelligent water injection string, can simultaneously perform sand control and cabled water injection operations on the target water injection layer, it allows for precise water injection during daily production, real-time dynamic monitoring of the target water injection layer, and dynamic adjustment as needed, thus improving the intelligence level of the well completion process.

[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A flowchart of a sand control and cable-guided injection well completion method provided in this embodiment of the disclosure;

[0039] Figure 2 A flowchart of another sand control and cabled injection well completion method provided in this disclosure embodiment;

[0040] Figure 3 A flowchart illustrating the insertion of a layered sand control completion tool into the target wellbore in a sand control and cabled injection completion method provided in this embodiment of the disclosure;

[0041] Figure 4 A flowchart illustrating the testing and adjustment of a cabled intelligent injection string in a sand control and cabled injection well completion method provided in this embodiment of the disclosure;

[0042] Figure 5 This is a schematic diagram of the structure of a layered sand control well completion tool provided in an embodiment of the present disclosure;

[0043] Figure 6 This is a schematic diagram of a sand-proof and cabled intelligent injection string provided in an embodiment of the present disclosure. Detailed Implementation

[0044] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0045] It should be noted that, unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by a person of ordinary skill in the art to which this disclosure pertains.

[0046] In the description of this disclosure, some directional terms are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure. In the embodiments of this disclosure, terms such as "upper," "lower," and "side" are generally used... Figure 5 or Figure 6 The relative positions shown are based on the given information, and these directional terms are used only to more clearly describe the relationships between structures, not to describe absolute positions. Positions may change when the product is placed in different orientations; for example, "up" and "down" may be interchanged.

[0047] To make the technical solutions and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0048] Currently, water injection well development has become a commonly used extraction technology in most oilfields. However, there are prominent inter-layer contradictions in different injection zones within the same well, and more than two layers are injected. Traditional water injection methods have low injection levels and cannot complete multi-layer injection. At the same time, they cannot monitor downhole temperature, pressure and other information in real time. Furthermore, the adjustment precision is low, the speed is slow and the data is unstable. In addition, sand production is common due to formation factors. Without effective sand control, the water injection effect will be affected, and even the normal production and development effect will be affected.

[0049] To address the issue that related technologies suffer from low levels of intelligence in well completion due to the inability to achieve precise allocation, real-time dynamic monitoring, and dynamic allocation based on demand, this disclosure provides a sand control and cable-guided injection well completion method to solve the problems existing in related technologies.

[0050] Figure 1 This is a flowchart illustrating a sand control and cable-guided well completion method provided in an embodiment of the present disclosure.

[0051] See Figure 1 The method includes the following steps:

[0052] Step 101: Determine the cabled intelligent injection string based on the number of layers and the length of each layer in the target well.

[0053] Step 102: Insert a cabled intelligent injection string into the target well that has undergone stratified sand control treatment;

[0054] Step 103: Test and adjust the cabled intelligent injection tubing string.

[0055] Therefore, the sand control and cabled injection completion method provided in this application determines the structure of the cabled intelligent injection string based on the number of layers and the length of each layer in the target well. The cabled intelligent injection string is then inserted into the target well that has undergone layered sand control treatment, and the string is tested and adjusted to cooperate with the layered sand control in achieving layered sand control and water injection. Because this sand control and cabled injection completion method, based on the existing layered sand control treatment, combines with the cabled intelligent injection string, it can simultaneously perform sand control and cabled water injection operations on the target layer. This allows for precise injection during daily production, real-time dynamic monitoring of the target layer, and dynamic adjustment as needed, improving the intelligence level of the completion process.

[0056] In some embodiments, before determining the cabled intelligent injection string based on the number of layers and the length of each layer in the target well, the method includes:

[0057] Determine whether the target well has undergone stratified sand control treatment;

[0058] If the target well has not undergone stratified sand control treatment, determine the stratified sand control completion tool based on the number of stratified water injection layers and the length of each layer in the target well, and then lower the stratified sand control completion tool into the target well.

[0059] In some embodiments, running a cabled smart injection string into a target well that has undergone stratified sand control treatment includes:

[0060] The cabled intelligent injection string is lowered into the layered sand control completion tool.

[0061] In some embodiments, the stratified sand control completion tool includes a sand control string, the sand control string including multiple packers, and inserting the stratified sand control completion tool into the target well includes:

[0062] Install sand control pipe string;

[0063] Multiple packers on the sand-control pipe string are sequentially sealed and verified to block formation sand.

[0064] In some embodiments, the cabled intelligent injection string is determined to include, based on the number of layers in the target well and the length of each layer:

[0065] Based on the number of layers for stratified water injection in the target well and the length of each layer, determine the tubing length, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of matching cables.

[0066] Based on the length of the oil pipe, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of matching cables, a cabled intelligent injection string is assembled.

[0067] In some embodiments, based on the tubing length, the number of intelligent water distribution cylinders, the number of cable-sealing components, and the number of matching cables, a cabled intelligent injection string is assembled, comprising:

[0068] Based on the length of the oil pipe, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of supporting cables, the oil pipes, cable sealing components, and intelligent water distribution cylinders are connected sequentially according to the layer order.

[0069] Connect one end of the matching cable to the intelligent water distribution cylinder, and extend the other end from the ground.

[0070] In some embodiments, determining the tubing length, the number of intelligent water distribution cylinders, the number of cable seals, and the number of matching cables based on the number of layers in the target well for stratified water injection and the length of each layer includes:

[0071] When there are four layers for stratified water injection in the target well, the number of intelligent water distribution cylinders, the number of cable sealing components, and the data for the matching cables are all determined to be four.

[0072] In some embodiments, testing and commissioning of the cabled smart injection string includes:

[0073] Connect each matching cable to the ground controller;

[0074] Start the ground controller and determine the communication status between the ground controller and each smart water distribution cylinder;

[0075] Under the condition that the communication status of each intelligent water distribution cylinder is good, the water injection data and pressure data of each layer in the target well are obtained.

[0076] In some embodiments, the sand control and cable-guided injection well completion method provided in this disclosure further includes:

[0077] Acquire real-time pressure and water injection data of the target well;

[0078] Based on the real-time pressure data and real-time water injection data of the target well, the real-time water injection volume of each layer is determined.

[0079] In some embodiments, the sand control and cable-guided injection well completion method provided in this disclosure further includes:

[0080] Based on the logging data of the target well, determine the depth of the target well, the number of layers for stratified water injection within the target well, and the length of each layer.

[0081] Figure 2 A flowchart illustrating another sand control and cabled injection well completion method provided in this disclosure embodiment. See also... Figure 2 The method includes the following steps:

[0082] Step 201: Determine whether the target well has undergone stratified sand control treatment.

[0083] In this embodiment of the application, the target well is the well to be studied. The target well has multiple layers that require stratified water injection.

[0084] In actual production operations, multi-layered sand-blocking barriers can be formed through layered sand-blocking treatment to prevent sand from blocking the water injection channel and affecting the water injection effect.

[0085] When the target well is an already developed well, it has undergone stratified sand control treatment and has packers and sand control tools compatible with the cabled intelligent injection string, meeting production requirements. When the target well is an undeveloped well, it has not yet undergone stratified sand control treatment, therefore, stratified sand control completion tools need to be run first before it can be used with the cabled intelligent injection string to achieve sand control and cabled injection completion. Therefore, it is necessary to determine whether the target well has undergone stratified sand control treatment at the beginning of the sand control and cabled injection completion method provided in this embodiment.

[0086] Step 202: If the target well has not undergone stratified sand control treatment, determine the stratified sand control completion tool according to the number of stratified water injection layers and the length of each layer in the target well, and lower the stratified sand control completion tool into the target well.

[0087] If it is determined that the target well has not undergone stratified sand control treatment, the structural composition of the stratified sand control completion tool is determined according to the number of stratified water injection layers and the length of each layer in the target well. The necessary structural accessories are equipped, and the stratified sand control completion tool is lowered into the target well after the structural accessories are assembled on the ground to achieve stratified sand control of the target well.

[0088] In some embodiments, the layered sand control completion tool includes a sand control string, which includes multiple packers spaced apart, with each adjacent packer corresponding to a water injection layer. The sand control string mainly consists of packers, connectors, and a sand control pipe. The packers form a seal within the wellbore to prevent formation fluids from flowing between layers. The connectors link the packers, sand control pipe, and other components together to form a complete sand control string. The sand control pipe is the core component of the sand control string, used to prevent formation sand particles from entering the wellbore. Currently, sand control pipes typically consist of screen pipes and blind pipes, with the screen pipe section corresponding to the water injection layer and the blind pipe section corresponding to the non-water injection layer. Using a combination of screen pipes and blind pipes can effectively reduce the manufacturing cost of the sand control pipe.

[0089] In this step, see Figure 3 ,in Figure 3 A flowchart illustrating the insertion of a layered sand control completion tool into a target well in a sand control and cabled injection well completion method provided in this disclosure embodiment includes the following sub-steps:

[0090] Step 2021: Insert the sand-proof pipe string.

[0091] Step 2022: Seal and verify the sealing of multiple packers on the sand control pipe string in sequence to block the formation sand.

[0092] In some embodiments, the sand control and cable-guided injection well completion method provided in this disclosure further includes:

[0093] Based on the logging data of the target well, determine the depth of the target well, the number of layers for stratified water injection within the target well, and the length of each layer.

[0094] Step 203: Determine the cable-operated intelligent injection string based on the number of layers and the length of each layer in the target well.

[0095] Since the cabled intelligent injection string needs to be lowered to the location corresponding to the water injection layer, the length of the cabled intelligent injection string and the corresponding structural accessories need to be determined based on the number of layers to be injected in the target well and the length of each layer.

[0096] In this embodiment of the application, the step specifically includes: determining the tubing length, the number of intelligent water distribution cylinders, the number of cable-passing seals, and the number of matching cables based on the number of layers for stratified water injection in the target well and the length of each layer; and assembling a cabled intelligent water injection string based on the tubing length, the number of intelligent water distribution cylinders, the number of cable-passing seals, and the number of matching cables.

[0097] The cabled intelligent injection string consists of tubing, an intelligent water distribution cylinder, a cable-through seal, and a matching cable. The tubing connects to the intelligent water distribution cylinder and the cable-through seal to allow the structure to be lowered into the wellbore. The intelligent water distribution cylinder monitors parameters such as flow rate, temperature, pressure, operating voltage, and current, and has sealing and injection functions. The cable-through seal is used for interlayer separation and to prevent oil-casing communication, enabling each layer to form an independent pressure sand-control cabled injection layer, and also serves as a cable connection and protection mechanism.

[0098] In some embodiments, the cabled smart injection string also includes a short section for connecting tubing to tubing.

[0099] In some embodiments, further, based on the length of the oil pipe, the number of intelligent water distribution cylinders, the number of cable sealing elements, and the number of matching cables, the assembled cable intelligent injection string includes: connecting the oil pipe, the cable sealing elements, and the intelligent water distribution cylinders in sequence according to the layer order based on the length of the oil pipe, the number of intelligent water distribution cylinders, the number of cable sealing elements, and the number of matching cables; connecting one end of the matching cable to the intelligent water distribution cylinder, and extending the other end from the ground to facilitate the power connection between the matching cable and the ground controller.

[0100] In some embodiments, determining the tubing length, the number of intelligent water distribution cylinders, the number of cable seals, and the number of supporting cables based on the number of stratified water injection layers in the target well and the length of each layer includes: when there are four stratified water injection layers in the target well, the number of intelligent water distribution cylinders, the number of cable seals, and the number of supporting cables are all four. That is, the number of layers is the same as the number of intelligent water distribution cylinders, the number of cable seals, and the number of supporting cables. Of course, the number of stratified water injection layers in the target well can also be multiple, such as five. In some cases, up to five independently pressurized cable-guided injection layers for sand control can be formed.

[0101] Step 204: Insert a cabled intelligent injection string into the target well that has undergone stratified sand control treatment.

[0102] A cabled intelligent injection string is installed in the target well that has undergone stratified sand control treatment, which facilitates the combination of sand control and cabled injection to achieve stratified sand control and water injection.

[0103] In this embodiment of the application, this step specifically includes: lowering the cabled intelligent injection string into the layered sand control completion tool.

[0104] Step 205: Test and adjust the cabled intelligent injection tubing string.

[0105] After the cabled intelligent injection string is run in, it needs to be tested and adjusted before well completion can be achieved.

[0106] In the embodiments of this application, see Figure 4 ,in Figure 4 This is a flowchart illustrating the testing and adjustment of a cabled intelligent injection string in a sand control and cabled injection completion method provided in this embodiment of the disclosure. This step specifically includes the following sub-steps:

[0107] Step 2051: Connect each matching cable to the ground controller.

[0108] By connecting each matching cable to the ground controller, the ground controller can obtain the data collected by the smart water distribution cylinder transmitted through the matching cable.

[0109] Step 2052: Start the ground controller and determine the communication status between the ground controller and each smart water distribution cylinder.

[0110] The ground controller must be activated. Accurate data acquisition from each smart water distribution cylinder is only possible if communication between the ground controller and each cylinder is stable. If communication between the ground controller and a particular smart water distribution cylinder is poor, the data collected by that cylinder will be inaccurate and cannot be used as the basis for subsequent water injection adjustments.

[0111] Step 2053: If the communication status of each smart water distribution cylinder is good, obtain the water injection data and pressure data of each layer in the target well.

[0112] Step 206: Obtain real-time pressure data and real-time water injection data of the target well.

[0113] Based on the real-time data acquired from each smart water distribution cylinder, the real-time pressure data and real-time water injection data of the target well can be obtained.

[0114] Step 207: Based on the real-time pressure data and real-time water injection data of the target well, determine the real-time water injection volume for each layer.

[0115] Based on the real-time pressure and water injection data of the target well, the water injection volume of each layer can be adjusted in real time, thereby achieving intelligent allocation, real-time monitoring, and precise injection.

[0116] Therefore, the sand control and cabled injection completion method provided in this application determines the structure of the cabled intelligent injection string based on the number of layers and the length of each layer in the target well. The cabled intelligent injection string is then inserted into the target well that has undergone layered sand control treatment, and the string is tested and adjusted to cooperate with the layered sand control in achieving layered sand control and water injection. Because this sand control and cabled injection completion method, based on the existing layered sand control treatment, combines with the cabled intelligent injection string, it can simultaneously perform sand control and cabled water injection operations on the target layer. This allows for precise injection during daily production, real-time dynamic monitoring of the target layer, and dynamic adjustment as needed, improving the intelligence level of the completion process.

[0117] The following example illustrates the design and completion process of well XX-XX-C53:

[0118] Step 1: Determine the layers requiring stratified water injection, and prepare the necessary tools and accessories according to the stratified design of the well section. The completion design of well XX-XX-C53 is shown in Table 1 below, completed within the 9-5 / 8” casing, with a total of 4 layers for sand control and stratified water injection.

[0119] Table 1: Completion Plan for Well XX-XX-C53

[0120]

[0121] Step 2: Install sand-blocking pipe strings to achieve multi-layered sand-blocking barriers.

[0122] Specifically, a sand control pipe string is lowered, and then multiple packers are sequentially seated. The packers and screen pipes are used to establish a 4-layer sand barrier. The sand control pipe string is shown in Table 2 below.

[0123] Table 2: Sand Control String Table for Well XX-XX-C53

[0124] name Top Depth Top packer assembly 1045.79 Change buckle 1048.70 blind pipe 1049.68 sieve tube 1061.18 Packer assembly #3 1176.73 Change buckle 1179.46 blind pipe 1180.49 sieve tube 1238.49 Packer assembly #2 1273.54 Change buckle 1276.28 blind pipe 1277.31 sieve tube 1306.31 Packer assembly #1 1375.86 Change buckle 1379.59 sieve tube 1719.62 Insert seal 1869.67 Sand packer 1870.00

[0125] Figure 5 This is a schematic diagram of the structure of a layered sand control well completion tool provided in an embodiment of this disclosure, as shown below. Figure 5As shown, from bottom to top, the components are: bottom packer assembly 100, anchor seal 200, screen tube / blind tube 300, packer assembly 1# 400 (the above combinations form sandproof layer 1#), screen tube / blind tube 500, packer assembly 2# 600 (combined to form sandproof layer 2#), screen tube / blind tube 700, packer assembly 3# 800 (combined to form sandproof layer 3#), screen tube / blind tube 900, and top packer assembly 4# 1000 (combined to form sandproof layer 4#).

[0126] Step 3: Lower the cable-supported injection pipe string and use it in conjunction with the sand control pipe string to achieve layered sand control and water injection.

[0127] The tubing string, from bottom to top, consists of: a 2-7 / 8" round plug; a 2-7 / 8" tubing or short section; a #1 intelligent water distribution cylinder; a 2-7 / 8" tubing and short section; a #1 4.75" cable insertion seal; a 2-7 / 8" tubing or short section (the original coupling is replaced with an integrated cable protector); a #2 intelligent water distribution cylinder; a 2-7 / 8" tubing or short section (the original coupling is replaced with an integrated cable protector); a #2 4.75" cable insertion seal; and a 2- 7 / 8" oil pipe or short section (original coupling replaced with integrated cable protector); #3 intelligent water distribution cylinder; 2-7 / 8" oil pipe or short section (original coupling replaced with integrated cable protector); #3 4.75" cable insertion seal; 2-7 / 8" oil pipe or short section (original coupling replaced with integrated cable protector); #4 intelligent water distribution cylinder; 2-7 / 8" oil pipe and short section; #4 6" cable positioning seal; 3-1 / 2" oil pipe and short section.

[0128] The construction sequence is as follows: Following the prepared tubing string, sequentially lower the round plug, 2-7 / 8" tubing, and short sections; connect the #1 intelligent water distribution cylinder, pass the cable insertion seal, and install the cable; install the cable at the integrated cable protector; Following the prepared tubing string, sequentially lower the 2-7 / 8" tubing and short sections; connect the #2 intelligent water distribution cylinder, pass the cable insertion seal, and install the cable at the integrated cable protector; Following the prepared tubing string, sequentially lower the 2-7 / 8" tubing and short sections; connect the #3 intelligent water distribution cylinder, pass the cable insertion seal, and install the cable; install the cable at the integrated cable protector; Following the prepared tubing string, sequentially lower the 2-7 / 8" tubing and short sections; connect the #4 intelligent water distribution cylinder, pass the cable insertion seal, and install the cable at the integrated cable protector; Following the prepared tubing string, sequentially lower the 2-7 / 8" tubing, short sections, and cable.

[0129] Figure 6 This is a schematic diagram of a sand-control and cabled intelligent injection string provided in an embodiment of the present disclosure, as shown below. Figure 6As shown, the cable seal 1#, in conjunction with the packer assembly, forms an interlayer separation, below which is a water injection layer with independent pressure. The intelligent water distribution cylinder, connected by cable, serves as a monitoring, sealing, and injection unit. Each part is connected by oil pipes and short sections to act as an injection channel, forming the sand-proof injection layer 1#001. The cable seal 2#23, in conjunction with the packer assembly 2#22 and the packer assembly 1#12, forms the second interlayer separation. The cable connecting the intelligent water distribution cylinder 1#11 passes through the cable packer 1#13 and connects to the intelligent water distribution cylinder 2#21. Each tool is connected by oil pipes and short sections to form the sand-proof injection layer 2#002. Cable seal 3#33, together with packer assembly 3#32 and packer assembly 2#22, forms the third interlayer partition. The cable connecting to intelligent water distribution cylinder 2#21 passes through cable packer 2#23 and connects to intelligent water distribution cylinder 3#31. All tools are connected with oil pipes and short sections to form sand-proof injection layer 3#003. Cable seal 4#, together with top packer assembly and packer assembly 3#32, forms the fourth interlayer partition. The cable connecting to intelligent water distribution cylinder 3#31 passes through cable packer 3#33 and connects to intelligent water distribution cylinder 4#41. All tools are connected with oil pipes and short sections to form sand-proof injection layer 4#004. Additionally... Figure 6 In the attached diagram, 5 indicates the matching cable, 6 indicates the tubing, 7 indicates the short section, 8 indicates the tubing hanger, 9 indicates the anchor seal, 10 indicates the round plug, 11 indicates the bottom packer assembly, and 12 indicates the screen pipe / blind pipe.

[0130] Step 4: After lowering the above-mentioned cabled intelligent water injection string into place, perform the following operations: Perform annular seal verification to confirm the sealing degree between the top packer and the cable seal; turn on the power to the surface controller and check the communication status between the surface controller and each level of the downhole cabled intelligent water distribution tubes, ensuring normal parameter readings and smooth nozzle adjustment, and perform inter-layer seal verification; lay pipes according to the tubing length, with the cable passing through the tubing hanger, and ensure proper cable crossing seals; turn on the power to the surface controller, start the testing and adjustment software, check the communication status between the surface controller and each level of the downhole cabled intelligent water distribution tubes, read downhole data, and perform parameter testing. Ensure normal parameter readings and smooth nozzle opening adjustment; use the surface controller to switch the water injection size and pressure at each layer, and monitor the pressure at each layer to ensure stratification is achieved; adjust the tubing length according to the actual situation and connect the cable; seal and test the tubing hanger; install and test the Christmas tree; complete sand control and cabled injection well completion and put it into use.

[0131] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this disclosure, "at least one" means one or more, and "more" means two or more, unless otherwise explicitly specified. Terms such as "comprising" or "including" indicate that the elements or objects preceding "comprising" encompass the elements or objects listed following "comprising" or "including" and their equivalents, and do not exclude other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. In the description of this specification, references to the terms "some embodiments" or "exemplary" indicate that a specific feature, structure, material, or characteristic described in connection with the described embodiments or examples is included in at least one embodiment or example of this disclosure.

[0132] The above description is merely an embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A sand control and tethered separate zone completion method, characterized by, The method includes: The cable-operated intelligent injection string is determined based on the number of layers and the length of each layer in the target well. The cabled intelligent injection string is lowered into the target well, which has already undergone stratified sand control treatment. The cabled intelligent injection string was tested and adjusted.

2. The sand control and tethered separate zone completion method of claim 1, wherein, Before determining the cabled intelligent injection string based on the number of layers and the length of each layer in the target well, the method includes: Determine whether the target well has undergone stratified sand control treatment; If the target well has not undergone stratified sand control treatment, the stratified sand control completion tool is determined based on the number of stratified water injection layers and the length of each layer in the target well, and the stratified sand control completion tool is then lowered into the target well.

3. The sand control and tethered separate zone completion method of claim 2, wherein, The process of lowering the cabled intelligent injection string into the target well, which has already undergone stratified sand control treatment, includes: The cabled intelligent injection string is lowered into the layered sand control completion tool.

4. The sand control and tethered separate zone completion method of claim 2, wherein, The layered sand control completion tool includes a sand control string, the sand control string includes multiple packers, and the step of inserting the layered sand control completion tool into the target well includes: Insert the sand-proof pipe string; Multiple packers on the sand-control pipe string are sequentially seated and verified to block formation sand.

5. The sand control and tethered separate zone completion method of claim 2, wherein, The determination of the cabled intelligent injection string based on the number of layers and the length of each layer in the target well includes: Based on the number of layers for stratified water injection in the target well and the length of each layer, determine the tubing length, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of matching cables. Based on the oil pipe length, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of matching cables, the cabled intelligent injection string is assembled.

6. The sand control and tethered separate zone completion method of claim 5, wherein, The cabled intelligent injection string, assembled based on the oil pipe length, the number of intelligent water distribution cylinders, the number of cable-sealing components, and the number of matching cables, comprises: Based on the oil pipe length, the number of intelligent water distribution cylinders, the number of cable-passing seals, and the number of matching cables, the oil pipes, the cable-passing seals, and the intelligent water distribution cylinders are connected sequentially according to the layer order. Connect one end of the matching cable to the intelligent water distribution cylinder, and extend the other end from the ground.

7. The sand control and tethered separate zone completion method of claim 5, wherein, The determination of the tubing length, the number of intelligent water distribution cylinders, the number of cable sealing components, and the number of matching cables based on the number of layers for stratified water injection in the target well and the length of each layer includes: When there are four layers of water injection in the target well, the number of intelligent water distribution cylinders, the number of cable sealing parts, and the data of the matching cables are all determined to be four.

8. The sand control and tethered separate zone completion method of claim 5, wherein, The testing and adjustment of the cabled intelligent injection string includes: Connect each of the aforementioned matching cables to the ground controller; Start the ground controller and determine the communication status between the ground controller and each smart water distribution cylinder; Under the condition that the communication status of each intelligent water distribution cylinder is good, the water injection data and pressure data of each layer in the target well are obtained.

9. The sand control and tethered separate zone completion method of claim 1, wherein, The method further includes: Acquire real-time pressure data and real-time water injection data of the target well; Based on the real-time pressure data and real-time water injection data of the target well, the real-time water injection volume for each layer is determined.

10. The sand control and tethered separate zone completion method of claim 1, wherein, The method further includes: Based on the logging data of the target well, determine the depth of the target well, the number of layers for stratified water injection within the target well, and the length of each layer.

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