CN111502599B - Acidification blockage removing method - Google Patents
Acidification blockage removing method Download PDFInfo
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- CN111502599B CN111502599B CN201910096006.6A CN201910096006A CN111502599B CN 111502599 B CN111502599 B CN 111502599B CN 201910096006 A CN201910096006 A CN 201910096006A CN 111502599 B CN111502599 B CN 111502599B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
Abstract
The invention provides an acidification blockage removing method, which relates to the technical field of oil and gas drilling and production and is used for solving the technical problem that the acid liquor consumption is not easy to determine when an oil and gas well is blocked; calculating the use amount of the deblocking acid solution according to the blockage metering point, wherein the volume amount of the deblocking acid solution is marked as V; controlling the pressure and emptying the operation pipe; injecting the plugging removal acid solution with the volume of V into the operation pipe, so that the attachments are soaked in the plugging removal acid solution; closing the operation pipe, and enabling the blockage removing liquid to react with the attachment for a preset time; the solution after blockage removal is drained back, the acidification blockage removal method provided by the invention can determine the optimal blockage removal acid solution dosage of the acidification attachment, and the condition that the blockage removal acid solution is excessive or the reaction of the attachment is incomplete is prevented.
Description
Technical Field
The invention relates to the technical field of oil and gas drilling and production, in particular to an acidification blockage removing method.
Background
In the process of well drilling and completion, in order to separate different geological systems and prevent the collapse of a well wall caused by different formation pressures, a sleeve pipe group is required to be fixed, the sleeve pipe group comprises at least one sleeve pipe, each layer of sleeve pipe is fixed by cement, an annular space between each layer of sleeve pipe is called as an annulus, liquid such as water flowing into the formation or construction is usually contained in the annulus, and the annulus liquid and the sleeve pipe maintain the stability of the support of the oil-gas well sleeve pipe together.
During drilling operations, the work tubular is inserted into the innermost casing (also referred to as the wellbore) for outward transport of oil and gas.
When oil and gas exploitation, especially the exploitation of high-temperature high-pressure deep oil and gas wells, due to the reasons of formation sand production, scaling of the operation pipe and the like, the blocking phenomenon that foreign matters such as sand and stone adhere to the inner wall of the operation pipe can occur, the oil and gas channels in the operation pipe are reduced, and the yield of a high-yield oil and gas well is reduced.
At present, the traditional method adopts continuous oil pipe dredging operation, a hose is laid into an operation pipe, plugging removal acid liquid is injected into the operation pipe through the hose, and the purpose of dredging and removing plugging is achieved through the reaction of the plugging removal acid liquid and attachments.
The inventor of the application finds in practical work that when acid liquor is injected into an operation pipe, the using amount of the acid liquor is not easy to control, if excessive acid liquor is injected, material waste and cost increase can be caused, and if a small amount of acid liquor is injected, the situation that blockage removal is not complete can be caused.
Disclosure of Invention
In view of the above problems, embodiments of the present invention provide an acidification blockage removal method, which can determine an optimal amount of a blockage removal acid solution, and can sufficiently reverse an attached substance with a minimum amount of the blockage removal acid solution.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
the embodiment of the invention provides an acidification blockage removing method, which comprises the following steps:
determining a blockage point in the operation pipe, which is closest to the air outlet end of the operation pipe, and recording the blockage point as a blockage metering point;
calculating the use amount of the deblocking acid solution according to the blockage metering point, wherein the volume amount of the deblocking acid solution is marked as V;
controlling pressure and emptying oil gas in the operation pipe;
injecting the plugging removal acid solution with the volume of V into the operation pipe, so that the attachments are soaked in the plugging removal acid solution;
closing the operation pipe, and enabling the blockage removing liquid to react with the attachment for a preset time;
and (5) returning and discharging the solution after blockage removal.
The acidizing plug removal method comprises the following steps of calculating the usage amount of the plug removal acid solution according to the plug metering point, wherein the volume amount of the plug removal acid solution is recorded as V:
and calculating the volume value of the operation pipe below the blockage measuring point, wherein the volume value is the volume V of the blockage removing acid liquid.
The acidizing unplugging method as described above, wherein the step of pressure controlled emptying the service pipe comprises:
and when the operation pipe is emptied, injecting a first inert liquid into the operation pipe to fill the operation pipe with the first inert liquid.
The acidizing plug removal method as described above, wherein before the step of pressure-controlled evacuation of the service pipe, the acidizing plug removal method further comprises:
an annulus in communication with the work tube is determined.
The acidizing plugging removal method as described above, wherein when an annulus is identified that is in communication with the service tubular, the step of pressure controlling to drain the service tubular comprises:
and injecting the first inert liquid into the operation pipe and the annular space communicated with the operation pipe, so that the operation pipe and the annular space communicated with the operation pipe are filled with the first inert liquid.
The acidizing unplugging method comprises the following steps of injecting a volume V of the unplugging acid solution into the operation pipe, so that attachments are soaked in the unplugging acid solution:
injecting the plugging removal acid solution with the volume of V into the operation pipe;
and injecting a second inert liquid into the operation pipe, and pushing the plugging removal acid liquid through the second inert liquid so that the attachment is soaked in the plugging removal acid liquid.
The acidizing unplugging method as described above, wherein prior to the step of pressure controlled emptying the service pipe, the acidizing unplugging method further comprises:
and injecting a test liquid into the operation pipe through the blockage measuring equipment, and judging the blockage degree of the operation pipe.
The acidification plug removal method comprises the following steps of injecting a test solution into the operation pipe through a plug detection device, and judging the plugging degree of the operation pipe, wherein the step comprises the following steps:
if the blockage detecting equipment sends out a first alarm signal, judging that the blockage degree of the operation pipe is serious blockage;
if the blockage detection equipment sends out a second alarm signal, the blockage degree of the operation pipe is judged to be general blockage;
and if the blockage detection equipment sends a passing signal, judging that the operation pipe is not blocked.
The acidizing unplugging method as described above, wherein, when it is determined that the plugging degree of the working pipe is serious plugging,
the step of pressure controlling evacuation of the service pipe comprises: inserting a coiled tubing into the operation pipe, so that one end of the coiled tubing is in contact with the plugging metering point, and the other end of the coiled tubing is positioned outside the operation pipe; injecting a first inert liquid through the coiled tubing such that the first inert liquid fills the coiled tubing and the work pipe;
injecting the plugging removal acid solution with a volume of V into the operation pipe, so that the attachment is soaked in the plugging removal acid solution, wherein the step of injecting the plugging removal acid solution with a volume of V into the operation pipe comprises the following steps: injecting the plugging removal acid solution into the coiled tubing; when the blockage removing acid liquor reaches the blockage metering point, closing the operation pipe, and continuously injecting the residual blockage removing acid liquor; injecting a second inert liquid into the continuous oil pipe, and pushing the blockage removing acid liquid through the second inert liquid so that attachments are soaked in the blockage removing acid liquid; and taking out the coiled tubing, and supplementing a second inert liquid in real time.
The acidizing unplugging method as described above, wherein before the step of returning the unplugged solution, the acidizing unplugging method further comprises:
and injecting a third inert liquid into the operation pipe, and pushing the solution after the blockage removing reaction into the stratum.
The acidizing de-plugging method as described above, wherein the third inert liquid is used in an amount at least equal to the volume V of the de-plugging acid liquid.
The acidification deblocking method as described above, wherein the reaction preset time is 0.5 hours to 2 hours.
Compared with the prior art, the acidification blockage removing method provided by the embodiment of the invention has the advantages that firstly, the blockage point closest to the operation pipe opening needs to be found and recorded as the blockage measuring point, the amount of the blockage removing acid solution needed in the blockage removing operation is determined through the blockage measuring point and recorded as V, during the blockage removing operation, oil gas in the operation pipe needs to be emptied, then the blockage removing acid solution with the volume of V is injected into the operation pipe, so that attachments can be fully soaked in the blockage removing acid solution, the operation pipe is closed, the preset time is fully reacted, and after the reaction is completed, liquid in the operation pipe is returned; the blockage removing method provided by the embodiment of the invention can determine the using amount of the blockage removing acid solution according to the actual blockage position, can fully acidify attachments, and can prevent excessive blockage removing acid solution from being input.
In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the advantages brought by the technical features of the technical solutions described above, other technical problems that can be solved by the acidification blockage removal method provided by the embodiments of the present invention, other technical features included in the technical solutions, and advantages brought by the technical features will be further described in detail in the detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of an acidification plug removal method according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an oil and gas well plugging provided by another embodiment of the present invention;
fig. 3 is a schematic view of a plug removal structure of a working pipe according to another embodiment of the present invention;
fig. 4 is a schematic diagram of a plug removal structure of an operation pipe according to still another embodiment of the present invention.
Description of the reference numerals:
1. a working pipe;
11. a conveying section;
12. a feeding section;
13. an air inlet end;
14. an air outlet end;
2. an annulus;
3. a sleeve;
4. a coiled tubing;
5. a plugging metering point;
6. a first inert liquid;
7. deblocking acid liquor;
8. a second inert liquid;
91. reducing the diameter;
92. a screen pipe;
10. the earth formation.
Detailed Description
In order to make the aforementioned objects, features and advantages of the embodiments of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In the oil and gas drilling operation, the problem that the operation pipe 1 may be clogged in the oil and gas well with high temperature and high pressure is described, and in the present embodiment, the gas well is taken as an example.
Referring to fig. 2, 3 and 4, during the drilling and production process, the combustible gas enters the operation pipe 1 from the gas inlet end 13 of the operation pipe 1 in the stratum 10, is conveyed through the operation pipe 1, and is transferred to an external conveying device from the gas outlet end 14 of the operation pipe 1 on the ground, and the foreign matters such as sand and stone in the stratum 10 are transferred to the operation pipe 1 along with the combustible gas and are attached to the inner wall of the operation pipe 1. Since the combustible gas flows in one direction in the operation pipe 1, the attachments attached to the inner wall of the operation pipe 1 are first attached to the inlet of the operation pipe 1 and then gradually accumulated in the outlet direction of the operation pipe 1, and in order to prevent the attachments from completely closing and blocking the operation pipe 1 to stop the production of the gas well, when the production of the gas well is found to be reduced, the operation pipe is usually unblocked.
Referring to fig. 1, fig. 2, fig. 3 and fig. 4, an embodiment of the present invention provides an acidizing unplugging method, including:
and S100, determining a blockage point closest to the air outlet end 14 of the operation pipe 1 in the operation pipe 1, and recording the blockage point as a blockage metering point 5.
Before the blockage relieving operation is carried out, the drift gauge is lowered into the operation pipe 1 from the air outlet end 14, and is moved towards the air inlet end 13, if the drift gauge cannot be moved smoothly at a certain position in the operation pipe 1, the position and the position below the position are both provided with attachments on the inner wall of the operation pipe 1, and the position is recorded as a blockage measuring point 5.
Alternatively, the bottom-sampling probe may be lowered into the working pipe 1, and similarly, if it is found that the bottom-sampling probe cannot be smoothly moved down at a certain position of the working pipe 1, it is determined that foreign matter is attached to the inner wall of the working pipe 1 at the position at or below the certain position, and the position is designated as the clogging measuring point 5.
S200, calculating the using amount of the blockage removing acid liquid 7 according to the blockage measuring point 5, and recording the volume amount of the blockage removing acid liquid 7 as V.
Before injecting the deblocking acid solution 7 into the operation pipe 1, the volume V of the deblocking acid solution 7 needs to be determined according to the position of the blockage measuring point 5, and the calculation process of the volume V will be described in detail in the following embodiments. During the blockage removing operation, the blockage removing acid solution 7 is injected from the air outlet end 14 and flows to the air inlet end 13 of the operation pipe 1, and in order to enable attachments on the inner wall of the operation pipe 1 to react with the blockage removing acid solution 7, the injected volume V of the blockage removing acid solution 7 at least needs to cover the blockage metering point 5.
S300, controlling pressure and emptying oil gas in the operation pipe 1.
Before the deblocking operation, the inside of the operation pipe 1 is usually filled with combustible gas, and in order to reduce the influence of the combustible gas on the deblocking operation, the combustible gas in the operation pipe 1 is usually evacuated before the deblocking operation, so that the deblocking acid solution 7 can sufficiently react with the attachments, and meanwhile, in order to prevent the operation pipe 1 from being depressurized and destabilized due to the evacuation of the combustible gas, the pressure in the operation pipe 1 needs to be stabilized, and the process of evacuating the combustible gas in the operation pipe 1 under controlled pressure will be described in detail in the following embodiments.
S400, injecting a V volume of deblocking acid solution 7 into the operation pipe 1, so that the attachments are soaked in the deblocking acid solution 7.
After the preparation process of the deblocking operation is completed, a deblocking acid solution 7 with a volume of V can be injected into the operation pipe 1, and in the injection process of the deblocking acid solution 7, the attachments on the pipe wall of the operation pipe 1 and the deblocking acid solution 7 begin to undergo chemical reaction and corrosion until the injection of the deblocking acid solution 7 is completed.
Since the component of the arrangement of the deblocking acid solution 7 depends on the component of the deposit on the inner wall of the working pipe 1, a trial etching step of the deblocking acid solution 7 is required before the deblocking acid solution 7 is injected into the working pipe 1. Specifically, a certain amount of the deblocking acid solution 7 is used for corroding a sample of the operation pipe 1, the production of a gas well is simulated, test conditions such as temperature and pressure are set, the corrosion rate of the sample of the operation pipe 1 under the conditions of high temperature and high pressure is recorded, when the corrosion rate meets the test specification, subsequent deblocking operation can be carried out, otherwise, the proportion of the deblocking acid solution 7 needs to be adjusted until the requirements specified in the stainless steel acidizing corrosion inhibitor technical requirements and test methods standard are met, optionally, the standard can be national specified parameter requirements or enterprise internal specified parameter requirements, and testers set the requirements according to actual requirements.
S500, closing the operation pipe 1, and enabling the blockage removing liquid to react with the attachments for a preset time.
The operation pipe 1 is closed, the blockage removing acid solution 7 and the attachments react for a preset time, the closed attachments on the operation pipe 1 can be fully corroded, and the operation pipe 1 can be dredged.
S600, discharging the unblocked solution back.
After the plugging removal acid solution 7 reacts with the attachment for a preset time, the plugging removal solution obtained after the plugging removal acid solution 7 reacts with the attachment is still remained in the operation pipe 1, the operation pipe is opened, and the plugging removal solution is discharged back to prepare for subsequent production work.
According to the acidification blockage removing method provided by the embodiment, the volume V required by the blockage removing acid solution 7 is determined according to the position of the blockage metering point 5 in the operation pipe 1 and the specification parameters of the operation pipe 1, so that the method of blindly injecting the dosage of the blockage removing acid solution 7 in the blockage removing operation of the traditional operation pipe 1 is changed, attached attachments can be fully acidified, and excessive blockage removing acid solution 7 is prevented from being input.
In the acidizing deblocking method provided in the above embodiment, in order to control the amount of the deblocking acid solution 7, the volume V of the deblocking acid solution 7 is usually calculated according to the blockage metering point 5 before the deblocking operation, and the specific calculation process is as follows:
and calculating the volume value of the operating pipe 1 below the blockage measuring point 5, wherein the volume value is the volume V of the blockage removing acid solution 7. The deblocking acid solution can react with the attachments on the pipe wall of the operation pipe 1 during the flowing process of the operation pipe 1, however, after the deblocking acid solution 7 with the volume V is completely injected into the operation pipe 1, in order to enable the blockage measuring point 5 to be still soaked in the deblocking acid solution 7, the volume V of the deblocking acid solution 7 is at least equal to the pipe volume of the pipe section of the operation pipe 1 between the blockage measuring point 5 and the air inlet end 13, and optionally, the volume V of the deblocking acid solution 7 in the embodiment is equal to the pipe volume of the pipe section between the blockage measuring point 5 and the air inlet end 13.
Measuring the lowering length of the drift size gauge along the axial direction of the operation pipe 1 to obtain the distance from the blockage measuring point 5 to the air outlet end 14, inquiring the pipe length specification data of the operation pipe 1, and calculating to obtain the distance from the blockage measuring point 5 to the air inlet end 13; the pipe volume from the blockage metering point 5 to the inlet section of the operation pipe 1 can be calculated by inquiring the pipe diameter specification data of the operation pipe 1.
Referring to fig. 3 and fig. 4, a schematic structural diagram of a pipe plug removal provided in this embodiment is shown, wherein the step of evacuating the pipe 1 under controlled pressure includes:
when the working pipe 1 is to be emptied, the first inert liquid 6 is injected into the working pipe 1 so that the working pipe 1 is filled with the first inert liquid 6.
During normal drilling and production construction, the operating pipe 1 is filled with combustible gas with certain pressure, and because the shape of the attachments is irregular with the characteristics of grooves, cracks and the like, the combustible gas flows in the operating pipe 1 and can easily isolate the reaction between the blockage removing acid solution 7 and the attachments, so that the blockage removing effect is reduced, and therefore the combustible gas in the operating pipe 1 needs to be emptied before blockage removing operation.
Meanwhile, in order to maintain the pressure stability in the working pipe 1, when the combustible gas in the working pipe 1 is evacuated, the first inert liquid 6 is injected into the working pipe 1 through the gas outlet end 14 of the working pipe 1, and the combustible gas is replaced with the first inert liquid 6.
Specifically, a high-pressure pump truck, a connection line connecting the high-pressure pump truck and the working pipe 1, and the like are prepared outside the working pipe 1, and the first inert liquid 6 is injected into the working pipe 1 by the high-pressure pump truck. Before the first inert gas 6 is injected into the operation pipe 1 through the high-pressure pump truck, clear water needs to be injected into the high-pressure pump truck until the pump pressure reaches the set highest pressure, the high-pressure pump truck is stabilized for the preset time under the pressure, and if the high-pressure pump truck does not leak water, the high-pressure pump truck is judged to be capable of performing subsequent pump liquid work into the operation pipe 1.
The first inert liquid 6 is an organic salt solution, the density of the organic salt solution is selected according to actual needs, and the density adopted in the embodiment is 1.4g/cm 3 An organic salt solution of (a).
Referring to fig. 3 and fig. 4, which are schematic structural diagrams of a blockage relieving method for an operation pipe according to the present embodiment, before the step of emptying the operation pipe 1 under controlled pressure, the method for acidizing blockage relieving further includes:
an annulus 2 is defined in communication with the work pipe 1.
During drilling and production, the working pipe 1 and the casing 3 may leak from the high-temperature and high-pressure gas well. When the operation pipe 1 leaks or the operation pipe 1 and the sleeve 3 leak, a part of the annular space 2 is communicated with the operation pipe 1, so that the combustible gas leaks into the annular space 2 communicated with the operation pipe 1, and the pressure stability between the sleeve 3 is damaged, therefore, before the plugging removal operation, whether the annular space 2 is communicated with the operation pipe 1 needs to be judged.
According to the historical data of the pressure of the operation pipe 1 and the pressure of the annular space 2, whether the operation pipe 1 and the sleeve 3 leak or not can be determined, if the pressure of the operation pipe 1 is equal to the pressure of the adjacent annular space 2, the sleeve 3 adjacent to the operation pipe 1 leaks, and otherwise, the sleeve 3 does not leak; if the pressure between two adjacent annuli 2 is equal, it indicates that the casing 3 between the two annuli 2 leaks, and conversely, the casing 3 is said to be leak-free.
Referring to fig. 3 and 4, a schematic structural diagram of a pipe plugging removal provided in this embodiment is shown, wherein when an annulus 2 communicating with a pipe 1 is determined, the step of emptying the pipe 1 under controlled pressure includes:
the first inert liquid 6 is injected into the working pipe 1 and the annulus 2 communicating with the working pipe 1, and the working pipe 1 and the annulus 2 communicating with the working pipe 1 are filled with the first inert liquid 6.
As described above, when the working pipe 1 or the casing 3 leaks, the flammable gas is filled in the annular space 2 communicating with the working pipe 1, and therefore, when the first inert liquid 6 is injected into the working pipe 1, it is necessary to simultaneously inject the first inert liquid 6 into the annular space 2 communicating with the working pipe 1, and it is necessary to ensure that the pressure of the first inert liquid 6 in the working pipe 1 is lower than the pressure of the first inert liquid 6 in the communicating annular space 2 in order to prevent the deblocking acid liquid 7 in the working pipe 1 from leaking into the annular space 2 through a leak point.
Referring to fig. 2, fig. 3 and fig. 4, which are schematic structural diagrams of the operation tube unblocking provided in this embodiment, the step of injecting a volume V of unblocking acid solution 7 into the operation tube 1 to soak the attachments in the unblocking acid solution 7 includes:
injecting a volume V of deblocking acid solution 7 into the operation pipe 1, filling the operation pipe 1 and an annular space 2 communicated with the operation pipe 1 with first inert liquid 6, injecting the volume V of deblocking acid solution 7 into the operation pipe 1 through the gas outlet end 14, and discharging the volume V of first inert liquid 6 to the gas inlet end 13 of the operation pipe 1.
When the plugging removal acid solution 7 with the volume of V is injected, the plugging removal acid solution 7 is located at the air outlet end 14 of the operation pipe 1, the second inert liquid 8 is continuously injected into the operation pipe 1 through the air outlet end 14, and the plugging removal acid solution 7 is pushed by the second inert liquid 8, so that the attachments are soaked in the plugging removal acid solution 7.
Because the attachment is arranged on the inner wall of the operation pipe 1, the flowing speed of the deblocking acid liquid 7 in the operation pipe 1 is low, after the injection of the deblocking acid liquid 7 is completed, part of the deblocking acid liquid 7 still remains at the air outlet end 14 of the operation pipe 1, in order to assist the flow of the deblocking acid liquid 7 to a pipe section below the blockage metering point 5, a high-pressure pump truck is used for continuously injecting a second inert liquid 8 into the operation pipe 1, the second inert liquid 8 also enters the operation pipe 1 through the air outlet end 14, and the continuously injected second inert liquid 8 pushes the deblocking acid liquid 7 to reach the pipe section below the blockage metering point 5.
Let V denote the volume of the second inert liquid 8 1 It will be appreciated that the volume V of the second inert liquid 8 is such that the deblocking acid 7 fills the pipe section below the blockage metering point 5 1 The sum of the volume V of the deblocking acid solution 7 and the volume V of the deblocking acid solution is the tube volume of the operation tube 1.
The unblocking acid solution 7 may be a mixed solution of hydrochloric acid and hydrofluoric acid, and the concentrations of the hydrochloric acid and the hydrofluoric acid are selected according to actual needs, in this embodiment, the concentration of the hydrochloric acid is 8% to 10%, and the concentration of the hydrofluoric acid is 0.5% to 2%; the second inert liquid 8 is an organic salt solution, the density of the organic salt solution is selected according to actual needs, and the density adopted in the embodiment is 1.4g/cm 3 An organic salt solution of (a).
In order to prevent the pump pressure of the high-pressure pump truck from exceeding the maximum allowable value, the flow rate of the unblocking acid liquid 7 in the embodiment is 0.5-0.8m 3 /min。
The amount of the attachments on the inner wall of the operation pipe 1 affects the liquid inlet speed of the deblocking acid solution 7 in the operation pipe 1, so that the blockage degree of the operation pipe 1 can be distinguished, and the blockage measuring operation is performed to determine the amount of the attachments in the operation pipe 1 before the blockage removing operation is performed in the embodiment. The acidification de-plugging method further comprises the following steps:
and (3) injecting a test solution into the operation pipe 1 through the blockage testing equipment, and judging the blockage degree of the operation pipe 1. When the blockage measuring equipment carries out blockage measuring operation, the test liquid is filled into the operation pipe 1 through the air outlet end 14, the liquid inlet speed of the test liquid into the operation pipe 1 is observed, and the blockage degree in the operation pipe 1 is judged according to the set liquid inlet speed or liquid inlet time.
Optionally, in this embodiment, the step of determining the degree of blockage of the working pipe 1 by measuring the liquid feeding time of the test liquid in the working pipe 1 includes: and injecting a test solution into the operation pipe 1 through the blockage measuring equipment, and judging the blockage degree of the operation pipe 1 to be serious blockage if the blockage measuring equipment sends a first alarm signal.
If the blockage detection equipment sends out a second alarm signal, the blockage degree of the operation pipe 1 is judged to be general blockage.
If the blockage detection equipment sends a passing signal, the operation pipe 1 is judged not to be blocked.
In this embodiment, a first time, a second time, and a third time of the liquid feeding are preset, where the first time is longer than the second time, and the second time is longer than the third time.
Putting quantitative test liquid into the operation pipe 1, if the test liquid does not completely flow into the operation pipe 1 within a preset first time period, judging that the operation pipe 1 is seriously blocked, and sending a first alarm signal; if the test solution completely flows into the operation pipe 1 within a preset second time period, judging that the operation pipe 1 is generally blocked, and sending a second alarm signal; and if the test liquid completely flows into the operation pipe 1 within the preset third time, judging that the operation pipe 1 is not blocked, and sending a passing signal.
The first alarm signal, the second alarm signal and the passing signal may be different buzzer sound prompts, or may be different indicator lights on the control panel, which is not limited in this embodiment.
The test solution can be water or organic salt solution with density of 1.4g/cm 3 。
Referring to fig. 2, during drilling and production, the operation pipe 1 is inserted into the innermost casing 3 for transporting oil and gas outwards, the operation pipe 1 comprises a feeding section 12 and a transporting section 11 for transporting oil and gas, and the feeding section 12 is arranged in a completion string for pumping oil and gas in the stratum 10.
In order to prevent sand and sand in the formation 10 from entering the pipe 1 with oil and gas, the feeding section 12 is usually provided with a sieve tube 92, or an anti-clogging tool such as a fishing plug is arranged on the inner wall of the feeding section 12, or both the sieve tube 92 and the anti-clogging tool are arranged; since the anti-clog tool is disposed on the inner wall of the feed section 12, the phenomenon of reduction of the oil and gas passage where the anti-clog tool is disposed is called the reduction 91.
As described above, when sand and stone enter the operation pipe 1 with combustible gas, they are firstly attached to the feeding section 12 of the operation pipe 1, and as time goes on, foreign matters are gradually attached and accumulated toward the outlet end 14 of the operation pipe 1, that is, the conveying section 11, so that when attachment occurs in the conveying section 11, the blockage of the feeding section 12 can be regarded as serious blockage, and the blockage measuring point 5 is located at the conveying section 11; if the attachment is only present below the feeding section 12, i.e. the diameter reduction 91, during the deblocking operation, the degree of blockage of the operation pipe 1 needs to be determined by a blockage measuring device, at this time, the diameter reduction 91 can be determined as the blockage measuring point 5.
Referring to fig. 2 and 4, when it is determined that the operation pipe 1 is severely blocked, the acidification de-blocking method provided in this embodiment first prepares a high-pressure pump truck and a pipeline outside the well, and stabilizes the pressure of the high-pressure pump.
The steps of pressure-controlling and emptying the operation pipe 1 comprise: inserting a continuous oil pipe 4 into the operation pipe 1, so that one end of the continuous oil pipe 4 is in contact with a blockage metering point 5, and the other end of the continuous oil pipe 4 is positioned on the outer side of the operation pipe 1; the first inert liquid 6 is injected through the coiled tubing 4 so that the first inert liquid 6 fills the coiled tubing 4 and the service pipe 1 and empties the service pipe 1 of the combustible gas therein.
Optionally, the first inert liquid 6 is simultaneously introduced into the annulus 2 communicating with the service pipe 1, evacuating the combustible gas in the annulus 2 communicating with the service pipe 1.
Injecting a V volume of the deblocking acid solution 7 into the operation pipe 1, so that the step of soaking the attachments in the deblocking acid solution 7 comprises the following steps: injecting a deblocking acid solution 7 into the continuous oil pipe 4; when the deblocking acid solution 7 reaches the blockage metering point 5, the operation pipe 1 is closed, and the residual deblocking acid solution 7 is continuously injected; injecting a second inert liquid 8 into the continuous oil pipe 4, and pushing the plugging removal acid liquid 7 through the second inert liquid 8 to soak attachments in the plugging removal acid liquid 7; and taking out the coiled tubing 4 and supplementing a second inert liquid 8 in real time.
The injection of the deblocking acid solution 7 in this embodiment comprises the following steps:
firstly, after the working pipe 1 and the coiled tubing 4 are filled with the first inert liquid 6, the deblocking acid liquid 7 can be injected into the coiled tubing 4, and when the deblocking acid liquid 7 is injected into the coiled tubing 4, the first inert liquid 6 is discharged from both the air inlet end 13 and the air outlet end 14 of the working pipe 1.
Secondly, when the liquid level of the deblocking acid liquid 7 in the coiled tubing 4 moves downwards to the blockage metering point 5, the air outlet end 14 of the operation tube 1 is closed and the deblocking acid liquid 7 is continuously injected, at the moment, the first inert liquid 6 can only be discharged from the air inlet end 13 of the operation tube 1, so that the flow of the deblocking acid liquid 7 in the coiled tubing 4 to the air inlet end 13 of the operation tube 1 is facilitated, that is, the operation tube 1 is closed, and the blockage deblocking acid liquid 7 can enter a tube section below the blockage metering point 5.
Thirdly, after injecting the deblocking acid solution 7 with the volume amount of V, continuing to inject V 2 And pushing the deblocking acid solution 7 downwards through the second inert liquid 8 by the volume amount of the second inert liquid 8.
Volume V of the second inert liquid 8 2 Equal to the pipe volume of the section of coiled tubing 4 inside the service pipe 1, it will be appreciated that after closing the outlet of the service pipe 1, the first inert liquid 6 between the coiled tubing 4 and the service pipe 1 can be considered as stationary, when injected V 2 A volume of the second inert liquid 8 can push the deblocking acid liquid 7 below the blockage metering point 5.
For a severely blocked operation pipe 1, in order to prevent the pump pressure of the high-pressure pump truck from exceeding the limit, the injection speed of the deblocking acid solution 7 needs to be limited, and optionally, the injection flow rate of the deblocking acid solution 7 in this embodiment is 80 to 350L/min.
Meanwhile, when the deblocking acid solution 7 is pumped, if the flow of the deblocking acid solution 7 reaches the maximum, the circulation of the deblocking acid solution 7 in the operation pipe 1 is still unsmooth, resulting in the pump pressure of the high-pressure pump truck reaching the maximum allowable value, the deblocking acid solution 7 can be pumped intermittently, that is, if the liquid feeding of the deblocking acid solution 7 in the operation pipe 1 is unsmooth and the pump pressure of the high-pressure pump truck reaches the upper limit, the high-pressure pump truck is suspended, and the deblocking acid solution 7 is pumped after the liquid feeding of the deblocking acid solution 7 is completed until the liquid capacity is increased after the additive is dissolved in the deblocking acid solution 7 or until the pumping of the deblocking acid solution 7 is completed.
When the second inert liquid 8 is injected, the pump pressure of the high-pressure pump truck needs to be paid attention to at any moment to prevent the pump pressure from exceeding the limit, and it can be understood that the first inert liquid 6 and the second inert liquid 8 can also be fed by an intermittent injection method.
And finally, pushing the deblocking acid solution 7 to a pipe section below the blocking metering point 5, taking out the coiled tubing 4, and supplementing a second inert liquid 8 in real time in the process of lifting the coiled tubing 4 so as to supplement gaps caused by lifting the coiled tubing 4.
The operation pipe 1 is closed, and the deblocking acid solution 7 and the attachments are reacted for a preset time, wherein the preset reaction time is 0.5 to 2 hours in the embodiment.
In one embodiment provided by the present invention, before the step of flowing back the deblocked solution, the acidizing deblocking method further comprises:
and injecting a third inert liquid into the operation pipe 1, and pushing the solution after the blockage removing reaction into the stratum 10.
After the plugging removal acid solution 7 erodes the attachments, a certain amount of residual acid still remains in the plugging removal solution, the pH value of the plugging removal solution is low, if the plugging removal solution is directly returned through a high-pressure pump truck, a ground pipeline is easily corroded, in order to protect the ground pipeline, third inert liquid is continuously injected into the operation pipe 1, the plugging removal solution in the operation pipe 1 is pushed into the stratum 10 through the third inert liquid, the residual acid reacts with sand stones and the like in the stratum 10, the pH value of the plugging removal solution is reduced, and meanwhile, the plugging removal acid solution is beneficial to being pushed through a feed channel of a gas well.
The reaction time of the residual acid and the formation 10 is set according to a preset time, in this embodiment, the preset time is 0.5 to 2 hours, and during the preset time, a worker can arrange the ground pipeline to prepare for subsequent production-seeking work.
The third inert liquid is an organic salt solution, the density of the organic salt solution is selected according to actual needs, and the density adopted in the embodiment is 1.4g/cm 3 An organic salt solution of (a).
In one embodiment of the invention, the third inert liquid is used in an amount at least equal to the volume V of the deblocking acid liquid 7.
To ensure that all the residual acid in the operation pipe 1 enters the formation 10, the volume of the third inert liquid should be at least equal to the volume V of the deblocking acid liquid 7. Optionally, the volume of the third inert liquid in this embodiment is the sum of the volume of the inside of the operation pipe 1 and the volume of all perforation holes, so that all the plugging removing solution in the operation pipe 1 can be pushed into the formation 10, and the residual acid in the plugging removing solution can fully react with the sand and stone in the formation 10, thereby effectively protecting the ground pipeline.
In one embodiment provided herein, the predetermined time of reaction is from 0.5 hours to 2 hours.
The reaction time of the deblocking acid solution 7 and the attachments in the operation pipe 1 is preset to be 0.5-2 hours, so that the deblocking acid solution 7 can fully react with the attachments in the operation pipe 1, and the phenomenon that the gas well yield is influenced because part of the attachments still remain in the operation pipe 1 is prevented.
The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. An acidizing unplugging method, comprising:
determining a blockage point in the operation pipe, which is closest to the air outlet end of the operation pipe on the ground, and recording the blockage point as a blockage metering point;
calculating the volume value of the operating pipe below the blockage metering point, wherein the volume value is the volume V of the blockage removing acid solution;
injecting a first inert liquid into the operation pipe to enable the operation pipe to be filled with the first inert liquid so as to control pressure and drain oil gas in the operation pipe;
injecting the plugging removal acid solution with the volume of V into the operation pipe, so that the attachments are soaked in the plugging removal acid solution;
closing the operation pipe, and enabling the blockage removing acid solution to react with the attachment for a preset time;
returning and discharging the solution after blockage removal;
before the step of emptying the operation pipe under the controlled pressure, the acidification plug removal method further comprises the following steps: determining whether an annulus is present in communication with the work tube;
if an annulus communicated with the operation pipe exists, injecting a first inert liquid into the operation pipe and the annulus communicated with the operation pipe to fill the operation pipe and the annulus communicated with the operation pipe with the first inert liquid;
the pressure of the first inert liquid in the working pipe is less than the pressure of the first inert liquid in the communicated annular space.
2. The acidizing deblocking method of claim 1, wherein the step of injecting a volume V of the deblocking acid fluid into the service pipe such that the attachment is immersed within the deblocking acid fluid comprises:
injecting the plugging removal acid solution with the volume of V into the operation pipe;
and injecting a second inert liquid into the operating pipe, and pushing the blockage removing acid liquid through the second inert liquid so as to soak the attachments in the blockage removing acid liquid.
3. The acidizing de-plugging method of claim 1, wherein prior to the step of pressure controlling emptying the service pipe, the acidizing de-plugging method further comprises:
and injecting a test liquid into the operation pipe through the blockage measuring equipment, and judging the blockage degree of the operation pipe.
4. The acidification plug removal method according to claim 3, wherein the step of judging the plugging degree of the operation pipe by injecting a test solution into the operation pipe through a plug detection device comprises the following steps:
if the blockage detection equipment sends out a first alarm signal, judging that the blockage degree of the operation pipe is serious blockage;
if the blockage detection equipment sends out a second alarm signal, the blockage degree of the operation pipe is judged to be general blockage;
and if the blockage detection equipment sends a passing signal, judging that the operation pipe is not blocked.
5. The acidizing plug removal method according to claim 4, wherein when the plugging degree of the operation pipe is judged to be serious plugging,
the step of pressure controlling evacuation of the service pipe comprises: inserting a coiled tubing into the operation pipe, so that one end of the coiled tubing is in contact with the plugging metering point, and the other end of the coiled tubing is positioned outside the operation pipe; injecting a first inert liquid through the coiled tubing such that the first inert liquid fills the coiled tubing and the work pipe;
injecting the plugging removal acid solution with a volume of V into the operation pipe, so that the attachment is soaked in the plugging removal acid solution, wherein the step of injecting the plugging removal acid solution with a volume of V into the operation pipe comprises the following steps: injecting the plugging removal acid solution into the coiled tubing; when the blockage removing acid liquor reaches the blockage metering point, closing the operation pipe, and continuously injecting the rest blockage removing acid liquor; injecting a second inert liquid into the continuous oil pipe, and pushing the blockage removing acid liquid through the second inert liquid to soak attachments in the blockage removing acid liquid; and taking out the coiled tubing, and supplementing a second inert liquid in real time.
6. The acidizing plug removal method of claim 1, wherein prior to the step of flowback of the unplugged solution, the acidizing plug removal method further comprises:
and injecting a third inert liquid into the operation pipe, and pushing the solution after the blockage removing reaction into the stratum.
7. The acidizing plug removal method of claim 6, wherein the third inert liquid is used in an amount at least equal to the volume V of the plugging acid removal solution.
8. The acidizing de-plugging method according to claim 1, wherein the reaction is carried out for a preset time period ranging from 0.5 hour to 2 hours.
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