Method for determining interference magnitude of soluble spherical pig of natural gas gathering and transportation pipeline

Abstract

The invention belongs to the technical field of pipeline cleaning, and particularly relates to a method for determining the interference magnitude of soluble pigging balls of a natural gas gathering and transportation pipeline. The interference magnitude of the soluble spherical pig applied to the natural gas gathering and transportation pipeline field is determined through the five steps of data preparation before test, abrasion test, interference magnitude calculation, determination of the optimal interference magnitude y of the soluble spherical pig and application of the determined result to field gathering and transportation pipeline cleaning. By means of the device, the soluble spherical pig can be tightly attached to the pipe wall, air leakage and liquid leakage are avoided, it can be guaranteed that the soluble spherical pig is pushed smoothly and cannot be blocked, and the optimal accumulated liquid or impurity removing efficiency is guaranteed. The method has the characteristics of scientificity, practicability, easiness in operation and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of pipeline cleaning, and in particular relates to a method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline. Background Art

[0002] During the gas field exploitation process, underground natural gas needs to be transported through pipelines. Since the raw natural gas is usually accompanied by produced water, foaming agents, mechanical impurities, etc., during the gathering and transportation process, it will affect the pipeline gas transmission capacity, gas transmission efficiency, metering accuracy, block instruments, and aggravate the corrosion of the inner wall of the pipeline. For the smaller-diameter gathering and transportation pipelines in the gas field, conventional pigging technology is prone to blockage, ball loss, and difficult positioning. There is currently no mature pigging technology. Therefore, small-diameter gathering and transportation pipelines in gas fields are rarely pigged. During winter operation, the accumulated liquid in the pipe is very likely to form hydrate freezing and blockage, resulting in suspension of transportation, affecting the peak gas supply in winter, and causing safety accidents in severe cases. With the large-scale development of gas fields, more and more natural gas wells are entering the middle and late stages of their lives, and the produced water will gradually increase. The problems of liquid accumulation and winter freezing in small-diameter gathering and transportation pipelines will become more and more prominent, so it is urgent to remove the accumulated liquid in small-diameter gathering and transportation pipelines. At present, domestic patent applications and academic papers can retrieve relevant soluble pigging ball pigging technology, involving principle introduction, field tests, etc. The interference design of soluble pigging balls has not yet formed a technical specification. At present, the design of the interference of soluble cleaning balls refers to the interference of conventional rubber cleaning balls, which results in high pressure on the cleaning ball and jamming of the cleaning ball when the interference of the soluble cleaning ball is too large; when the interference is too small, the cleaning force of the cleaning ball is insufficient and the cleaning efficiency is poor. In view of the interference design problem of soluble cleaning balls, it is urgent to combine theory with practice and explore a more scientific interference determination method, which can not only make the soluble cleaning ball close to the pipe wall without air and liquid leakage, but also ensure that the soluble cleaning ball can be pushed smoothly without jamming, and ensure the best efficiency of clearing accumulated liquid or impurities. This method is scientific, practical, and easy to operate. Summary of the invention

[0003] The present invention provides a method for determining the interference fit of a soluble pigging ball for a natural gas gathering and transportation pipeline, and aims to provide a method for solving the problems of pigging ball jamming, high ball pushing pressure and poor pigging efficiency caused by interference fit deviation during pigging of a natural gas gathering and transportation pipeline.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline comprises the following steps:

[0006] Step 1: Data preparation before the experiment;

[0007] Step 2: Wear test;

[0008] Step 3: Calculate the interference amount;

[0009] Step 4: Determine the optimal interference amount y of the soluble pig ball;

[0010] Step 5: Apply the results determined in step 4 to the on-site gathering and transportation pipeline cleaning.

[0011] The pre-test data preparation in step 1 includes recording the length L of the natural gas gathering and transportation pipeline and the inner diameter d of the natural gas gathering and transportation pipeline.

[0012] The detailed process of the wear test in step 2 is as follows:

[0013] Step 1: Make the pipe cleaning ball experimental sample;

[0014] Step 2: Measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball before wear, recorded as D 磨耗前 ;

[0015] Step 3: After grinding both sides of the sample, stick it to the rubber wheel of the Akron abrasion machine, and fix the rubber wheel with the sample on the rubber wheel shaft; adjust the grinding wheel of the Akron abrasion machine to make it fully contact with the sample;

[0016] Step 4: Spray water on the sample, turn on the electronic counter, adjust the preset number button n = 2123 ~ 3416, press the "Start" button to start the experiment, when the count reaches the preset value, press the "Stop" and "Reset" buttons, remove the sample, brush off the wear debris, measure the maximum outer diameter of the sample, that is, the outer diameter of the pig after wear, and record it as D 磨耗后 .

[0017] The interference calculation in step 3 includes the following process:

[0018] Step 1: Calculate the wear DW of the soluble pig ball sample per kilometer of contact surface diameter 1km接触面 ;

[0019] Step 2: Calculate the contact area S between the soluble pig sample and the Akron abrasive machine grinding wheel 接触面 :

[0020] Step 3: Calculate the surface area S of the soluble pig ball 球表面积 ;

[0021] Step 4: Calculate the wear loss DW of the diameter of the pig ball for 1 km 1公里清管球球体直径磨耗 ;

[0022] Step 5: Calculate the diameter wear DW of the soluble pig ball 清管球直径磨耗 .

[0023] In the first step, the wear loss DW of the soluble pig ball sample per kilometer of contact surface diameter is estimated. 1km接触面 It is performed using the following formula

[0024]

[0025] Among them: DW 1km接触面 The unit is mm.

[0026] The contact area S between the soluble pig ball sample and the Akron abrasive machine grinding wheel is estimated in the second step. 接触面 It is performed using the following formula

[0027] S 接触面 =W 接触面 (π×D 磨耗前 );

[0028] Where: S 接触面 The unit is mm 2 .

[0029] The surface area S of the soluble pig ball is calculated in the third step. 球表面积 It is performed using the following formula

[0030]

[0031] Where: S 球表面积 The unit is mm 2 .

[0032] The fourth step is to estimate the wear loss DW of the diameter of the pig ball for 1 km. 1公里清管球球体直径磨耗 It is performed using the following formula

[0033]

[0034] Among them: DW 1公里清管球球体直径磨耗 The unit is mm.

[0035] The fifth step is to estimate the diameter loss DW of the soluble pig ball. 清管球直径磨耗 It is performed using the following formula

[0036] DW 清管球直径磨耗 =L×DW 1公里清管球球体直径磨耗 ;

[0037] Among them: DW 清管球直径磨耗 The unit is mm.

[0038] The optimal interference amount y of the soluble cleaning ball in step 4 is determined as

[0039]

[0040] Beneficial effects:

[0041] (1) The present invention solves the problems of pig jamming, high ball pushing pressure and poor pigging efficiency caused by interference deviation when using soluble pigging balls in natural gas gathering and transportation pipelines. A scientific method for determining interference can be explored to ensure that the soluble pigging balls can be tightly attached to the pipe wall without leaking air or liquid, and that the soluble pigging balls can be pushed smoothly without jamming, thereby ensuring the best efficiency in clearing accumulated liquid or impurities.

[0042] (2) The present invention is scientific, practical, and easy to operate.

[0043] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a detailed flow chart of the present invention.

[0046] Figure 2 It is a side view of the pipe cleaning ball experimental sample in the present invention.

[0047] Figure 3 It is a cross-sectional view of the experimental sample of the pipe cleaning ball in the present invention.

[0048] Figure 4 Schematic diagram of the Akron abrasion machine used in the present invention.

[0049] In the figure: 1. rubber wheel shaft; 2. motor; 3. reducer; 4. grinding wheel; 5. electronic counter. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] Embodiment 1:

[0052] according to Figure 1 A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline is shown, comprising the following steps:

[0053] Step 1: Data preparation before the experiment;

[0054] Step 2: Wear test;

[0055] Step 3: Calculate the interference amount;

[0056] Step 4: Determine the optimal interference amount y of the soluble pig ball;

[0057] Step 5: Apply the results determined in step 4 to the on-site gathering and transportation pipeline cleaning.

[0058] The determination of the interference amount of the soluble pig ball for natural gas gathering and transportation pipelines of the present invention can be completed by using an Akron abrasion machine and a ruler. The data are obtained through experiments, measurements and calculations. The experimental process of the present invention simulates the operation movement process of the soluble pig ball for cleaning the pipeline, and has certain scientificity, reliability and practicality.

[0059] The invention has been field tested on 8 gas production pipelines and 2 gas production mains, and the results show that the above method for determining the interference amount of the soluble pig ball is targeted, reliable and applicable, and has a great guiding role in the on-site pigging of gathering and transportation pipelines.

[0060] Embodiment 2:

[0061] according to Figure 1-4 A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline is shown. The pre-test data preparation in step 1 includes recording the length L of the natural gas gathering and transportation pipeline and the inner diameter d of the natural gas gathering and transportation pipeline; wherein: the unit of the length L of the natural gas gathering and transportation pipeline is km, and the unit of the inner diameter of the natural gas gathering and transportation pipeline is mm.

[0062] Furthermore, the detailed process of the wear test in step 2 is as follows:

[0063] Step 1: Make the pipe cleaning ball experimental sample;

[0064] The pipe cleaning ball test specimens are as follows: Figure 2 and Figure 3 As shown, the pipe cleaning ball test sample is a cylinder with a hole in the center; the thickness of the pipe cleaning ball test sample is 5 to 50 mm, and the hole diameter is consistent with the diameter of the rubber wheel shaft 1 in the Akron abrasion machine.

[0065] Step 2: Measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball before wear, recorded as D 磨耗前 ;

[0066] Step 3: After grinding both sides of the sample, stick it to the rubber wheel of the Akron abrasion machine, and fix the rubber wheel with the sample on the rubber wheel shaft 1; adjust the grinding wheel 4 of the Akron abrasion machine to make it fully contact with the sample;

[0067] Measure the contact width between the pipe cleaning ball test sample and the grinding wheel 4, recorded as W 接触面 , unit: mm.

[0068] Step 4: Spray water on the sample, turn on the electronic counter 5 switch, adjust the preset number button n = 2123 ~ 3416, press the "Start" button to start the experiment, when the count reaches the preset value, press the "Stop" and "Reset" buttons, remove the sample, brush off the wear debris, measure the maximum outer diameter of the sample, that is, the outer diameter of the pig after wear, and record it as D 磨耗后 The unit of the outer diameter of the cleaning ball after wear is mm.

[0069] Furthermore, the interference calculation in step 3 includes the following process:

[0070] Step 1: Calculate the wear DW of the soluble pig ball sample per kilometer of contact surface diameter 1km接触面 ;

[0071] The above steps are used to estimate the wear loss DW of the soluble pig ball sample per kilometer of contact surface diameter. 1km接触面 It is performed using the following formula

[0072]

[0073] Among them: DW 1km接触面 The unit is mm.

[0074] Step 2: Calculate the contact area S between the soluble pig sample and the Akron abrasive grinding wheel 4 接触面 :

[0075] The contact area S between the soluble pig ball sample and the Akron abrasive machine grinding wheel 4 is estimated in the above steps. 接触面 It is performed using the following formula

[0076] S 接触面 =W 接触面 (π×D 磨耗前 );

[0077] Where: S 接触面 The unit is mm 2 .

[0078] Step 3: Calculate the surface area S of the soluble pig ball 球表面积 ;

[0079] The above steps are used to estimate the surface area S of the soluble pig ball. 球表面积 It is performed using the following formula

[0080]

[0081] Where: S 球表面积 The unit is mm 2.

[0082] Step 4: Calculate the wear loss DW of the diameter of the pig ball for 1 km 1公里清管球球体直径磨耗 ;

[0083] The above steps estimate the wear loss DW of the diameter of the pig ball for 1 km. 1公里清管球球体直径磨耗 It is performed using the following formula

[0084]

[0085] Among them: DW 1公里清管球球体直径磨耗 The unit is mm.

[0086] Step 5: Calculate the diameter wear DW of the soluble pig ball 清管球直径磨耗 .

[0087] The above steps are used to estimate the diameter loss DW of the soluble pig ball. 清管球直径磨耗 It is performed using the following formula

[0088] DW 清管球直径磨耗 =L×DW 1公里清管球球体直径磨耗 ;

[0089] Among them: DW 清管球直径磨耗 The unit is mm.

[0090] Furthermore, the optimal interference amount y of the soluble cleaning ball in step 4 is determined as

[0091]

[0092] The present invention can be measured by an Akron abrasion machine.

[0093] Working principle of Akron abrasion machine:

[0094] (1) Transmission: The motor 2 is connected to the reducer 3 through a coupling, so that the rubber wheel shaft 1 rotates clockwise, and the sample is clamped on the rubber shaft.

[0095] (2) Electronic counter 5: After "starting", the execution relay inside the machine is immediately energized, and its contacts are directly connected to the power supply to output to the outside of the machine, so that the motor 2 runs. The end of the grinding wheel shaft is equipped with a photoelectric conversion switch connected to the counter for counting. When the count reaches the preset value, the relay automatically disengages.

[0096] The Akron wear machine used in the present invention is purely based on the prior art and comprises at least a rubber wheel shaft 1, a motor 2, a reducer 3, a grinding wheel 4 and an electronic counter 5.

[0097] Embodiment three:

[0098] Calculate the optimal interference of soluble pigging ball for natural gas gathering and transportation pipeline φ219×7×11 (outer diameter mm×wall thickness mm×length km)

[0099] Step 1: Data preparation before the experiment

[0100] (1) Length of natural gas gathering and transportation pipeline, L = 11, (km)

[0101] (2) Inner diameter of natural gas gathering and transportation pipeline, d = 219-2 × 7 = 205, (mm)

[0102] Step 2: Wear test

[0103] (1) Prepare the pipe cleaning ball test sample and measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball before wear, recorded as D 磨耗前 =217, (mm, millimeters).

[0104] (2) After grinding both sides of the sample, glue it to the rubber wheel, and fix the glued sample to the rubber wheel shaft 1. Adjust the grinding wheel 4 of the Akron abrasive machine to make it fully contact with the sample.

[0105] Measure the contact width between the sample and the grinding wheel 4, recorded as W 接触面 =44, (mm, millimeters).

[0106] (3) Spray water on the sample, adjust the preset number button to 2123, start the experiment, remove the sample after completion, brush off the wear debris, and measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball after wear, recorded as D 磨耗后 =213.5, (mm, millimeters).

[0107] Step 3: Calculate the interference

[0108] Abrasion of soluble pig ball sample with 1 km contact surface diameter:

[0109]

[0110] The contact area between the soluble pig ball sample and the grinding wheel 4 of the Akron abrasive machine:

[0111] S 接触面 =W 接触面 (π×D 磨耗前 )=44×(π×217)=29980.72(mm 2 , square millimeters)

[0112] Soluble pig surface area:

[0113]

[0114] Wear loss of pig ball diameter for 1 km mileage:

[0115]

[0116] Calculate the wear of the soluble pig ball diameter after pigging is completed:

[0117] DW 清管球直径磨耗 =L×DW 1公里清管球球体直径磨耗 =11×0.71=7.81 (mm, millimeters)

[0118] Optimal interference:

[0119]

[0120] In the absence of conflicts, technicians in this field can combine the relevant technical features in the above examples according to actual conditions to achieve corresponding technical effects. The specific combinations are not described here one by one.

[0121] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0122] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0123] The above are only preferred embodiments of the present invention. The present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline, characterized in that: The following steps are included: Step 1: Data preparation before the experiment; Step 2: Wear test; Step 3: Calculate the interference amount; Step 4: Determine the optimal interference amount y of the soluble pig ball; Step 5: Apply the results determined in step 4 to the on-site gathering and transportation pipeline cleaning.

2. A method for determining the interference amount of a soluble pig ball for a natural gas gathering and transportation pipeline according to claim 1, characterized in that: The pre-test data preparation in step 1 includes recording the length L of the natural gas gathering and transportation pipeline and the inner diameter d of the natural gas gathering and transportation pipeline.

3. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 1, characterized in that: The detailed process of the wear test in step 2 is as follows: Step 1: Make the pipe cleaning ball experimental sample; Step 2: Measure the maximum outer diameter of the sample, that is, the outer diameter of the pipe cleaning ball before wear, recorded as D 磨耗前 ; Step 3: After grinding both sides of the sample, stick it to the rubber wheel of the Akron abrasion machine, and fix the rubber wheel with the sample on the rubber wheel shaft (1); adjust the grinding wheel (4) of the Akron abrasion machine to make it fully contact with the sample; Step 4: Spray water on the sample, turn on the switch of the electronic counter (5), adjust the preset number button n = 2123 ~ 3416, press the "start" button to start the experiment, when the count reaches the preset value, press the "stop" and "clear" buttons, remove the sample, brush off the wear debris, measure the maximum outer diameter of the sample, that is, the outer diameter of the pig after wear, record it as D 磨耗后 。 4. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 1, characterized in that: The interference calculation in step 3 includes the following process: Step 1: Calculate the wear DW of the soluble pig ball sample per kilometer of contact surface diameter 1km接触面 ; Step 2: Calculate the contact area S between the soluble pig sample and the Akron abrasive machine grinding wheel (4) 接触面 : Step 3: Calculate the surface area S of the soluble pig ball 球表面积 ; Step 4: Calculate the wear loss DW of the diameter of the pig ball for 1 km 1公里清管球球体直径磨耗 ; Step 5: Calculate the diameter wear DW of the soluble pig ball 清管球直径磨耗 。 5. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 4, characterized in that: In the first step, the wear loss DW of the soluble pig ball sample per kilometer of contact surface diameter is estimated. 1km接触面 It is carried out using the following formula Among them: DW 1km接触面 The unit is mm.

6. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 4, characterized in that: In the second step, the contact area S between the soluble pipe cleaning ball sample and the Akron abrasive machine grinding wheel (4) is estimated. 接触面 It is performed using the following formula S 接触面 =W 接触面 (π×D 磨耗前 ); Where: S 接触面 The unit is mm 2 .

7. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 4, characterized in that: The surface area S of the soluble pig ball is calculated in the third step. 球表面积 It is performed using the following formula Where: S 球表面积 The unit is mm 2 .

8. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 4, characterized in that: The fourth step is to estimate the wear loss DW of the diameter of the pig ball for 1 km. 1公里清管球球体直径磨耗 It is performed using the following formula Among them: DW 1公里清管球球体直径磨耗 The unit is mm.

9. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 4, characterized in that: The fifth step is to estimate the diameter loss DW of the soluble pig ball. 清管球直径磨耗 It is carried out using the following formula DW 清管球直径磨耗 =L×DW 1公里清管球球体直径磨耗 ; Among them: DW 清管球直径磨耗 The unit is mm.

10. A method for determining the interference amount of a soluble pig ball in a natural gas gathering and transportation pipeline according to claim 1, characterized in that: The optimal interference amount y of the soluble cleaning ball in step 4 is determined as

Images