CN108661618B - Reservoir transformation method for L type horizontal well of coal bed gas - Google Patents
Reservoir transformation method for L type horizontal well of coal bed gas Download PDFInfo
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- CN108661618B CN108661618B CN201710210763.2A CN201710210763A CN108661618B CN 108661618 B CN108661618 B CN 108661618B CN 201710210763 A CN201710210763 A CN 201710210763A CN 108661618 B CN108661618 B CN 108661618B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
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- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/114—Perforators using direct fluid action on the wall to be perforated, e.g. abrasive jets
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Abstract
The invention discloses a reservoir transformation method of a coal bed gas L type horizontal well, which belongs to the technical field of coal bed gas development and comprises the step of sequentially carrying out hydraulic jet hole-making operation on a plurality of jet points of a horizontal section of a coal bed gas reservoir to be constructed through a sand-blasting pipe column, wherein the sand-blasting pipe column comprises an oil pipe, a spray gun and a ball seat which are sequentially connected from top to bottom, the oil pipe is connected with a hanger of a flange below a well mouth, the hydraulic jet hole-making operation comprises the steps of a moving the spray gun to the position of the jet points, b, opening a casing gate, injecting first clean water into the oil pipe, c, injecting sand-carrying liquid into the oil pipe, injecting second clean water into the oil pipe for positive circulation sand flushing, d, closing the casing gate, injecting third clean water into the oil pipe, opening the casing gate, and injecting fourth clean water into the oil pipe for positive circulation sand flushing.
Description
Technical Field
The invention relates to the technical field of coal bed methane development, in particular to a reservoir transformation method of a L-type coal bed methane horizontal well.
Background
In recent years, with the increase of the demand of the coal bed gas, the reservoir of a coal bed gas horizontal well is generally reformed to increase the yield of the coal bed gas horizontal well, the coal bed gas horizontal well is divided into a pinnate multi-branch horizontal well and an L type horizontal well according to the well type, the former horizontal well is mainly the pinnate multi-branch horizontal well, the well completion mode is open hole well completion, which causes poor stability of the well wall of a horizontal section, a coal bed is easy to collapse, and the targeted reservoir reformation cannot be carried out, while the L type horizontal well is a new well type suitable for coal bed gas development, which consists of a straight well and a horizontal section with a certain length drilled at one section of the straight well side, has the characteristics of short drilling period, simple process and low drilling cost, and the well completion mode is screen pipe injection well completion under the horizontal well, at present, a horizontal well pump or a rodless discharge and extraction system is directly used for discharging and extracting the reservoir without a targeted reformation measure after the completion of the coal bed gas L type horizontal well, therefore, how to carry out the L type horizontal well is the reformation, which.
Patent document CN104153753 a provides a horizontal well volume fracturing string and fracturing method based on conventional oil pipe pressure dragging, which adopts conventional oil pipe transmission, packer packing constructed layer, hydraulic sand blasting perforation through hydraulic sand blasting, and matching with ground annular blowout preventer combined fracturing tree pressure dragging string to realize continuous staged volume fracturing construction of oil well and gas well horizontal well.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
the fracturing method in patent document CN104153753 a is suitable for the case of high pressure in an oil-gas well, and the coal-bed gas has the characteristic of low pressure, and after drilling, methane cannot be desorbed into the coal-bed gas well shaft immediately, and at this time, only the water column pressure and a very small part of free gas pressure exist in the coal-bed gas well shaft; the tubular column in patent document CN 104153753A has a complex structure, and is suitable for a reservoir with good well wall stability, while a coal bed gas well has poor well wall stability and easy collapse of a coal bed due to the characteristics of coal rock, and if the tubular column is buried, a shaft is more complicated, larger economic loss is generated, and the applicability in the coal bed gas horizontal well is poor; in addition, patent document CN104153753 a applies a fracturing mode for modification, the modification range is limited, and the coal seam stress cannot be effectively released.
Disclosure of Invention
In order to solve the problem that the reservoir of a coal bed methane L type horizontal well cannot be effectively reformed in the prior art, the embodiment of the invention provides a reservoir reforming method of a coal bed methane L type horizontal well, and the technical scheme is as follows:
a reservoir transformation method of a L type horizontal well for coal bed gas comprises the steps of sequentially carrying out hydraulic jet cave-making operation on a plurality of jet points of a horizontal section of a coal bed gas reservoir to be constructed through a sand blasting tubular column, wherein the sand blasting tubular column comprises an oil pipe, a spray gun and a ball seat which are sequentially connected from top to bottom, and the oil pipe is connected with a hanger of a lower flange of a wellhead;
the hydraulic jet hole-making operation comprises the following steps:
a. moving the lance to a position of the injection point;
b. opening a casing gate, and injecting first clean water into the oil pipe;
c. injecting a sand-carrying fluid into the oil pipe; injecting second clean water into the oil pipe for positive circulation sand washing;
d. closing the casing gate and injecting third clear water into the oil pipe; opening the casing gate, and injecting fourth clear water into the oil pipe for positive circulation sand washing;
wherein, the injection amount and the flow rate of the first clean water are minimum, and the injection amount of the fourth clean water is maximum.
Specifically, the parameters of the first clear water in the step b are set as follows: the injection amount of the first clear water is 5-10 m3Flow rate of 1m3/min。
Specifically, the parameters of the first clear water in the step b are set as follows: the injection amount of the first clear water is 5m3Flow rate of 1m3/min。
Specifically, the parameters of the sand-carrying fluid in the step c are set as follows: the injection amount of the sand carrying liquid is 10-20 m3The flow rate is 1.8-3 m3Min, and the sand ratio is less than 10 percent;
and the parameters of the second clear water are as follows: the injection amount of the second clear water is 20-30 m3The flow rate is 1.8-3 m3/min。
Specifically, the parameters of the sand-carrying fluid in the step c are set as follows: the injection amount of the sand-carrying liquid is 15m3Flow rate of 2.53Min, and the sand ratio is 7 percent;
and the parameters of the second clear water are as follows: the injection amount of the second clear water is 30m3The flow rate is 2.5m3/min。
Specifically, the parameters of the third clear water in the step d are set as follows: the injection amount of the third clear water is 20-30 m3The flow rate is 1.8-3 m3/min；
And the parameters of the fourth clear water are set as follows: the injection amount of the fourth clear water is 50-60 m3The flow rate is 1.8-3 m3/min。
Specifically, the parameters of the third clear water in the step d are set as follows: the injection amount of the third clear water is 20m3The flow rate is 2.5m3/min；
And the parameters of the fourth clear water are set as follows: the injection amount of the fourth clear water is 50m3The flow rate is 2.5m3/min。
Specifically, when the hydraulic jet hole making operation is performed on each jet point, whether the spray gun meets the construction requirement is judged according to the jet pressure change condition of the spray gun, and the judging method specifically comprises the following steps:
when the hydraulic jet hole making operation is carried out on the jet points, under the condition that the flow rate of the first clear water, the sand carrying liquid, the second clear water, the third clear water or the fourth clear water injected into the oil pipe is kept unchanged, if the jet pressure of the spray gun is reduced by less than 25%, the hydraulic jet hole making operation is continuously carried out on the next jet point;
and if the injection pressure drop amplitude of the spray gun is more than or equal to 25%, after the current injection hole-making operation is finished, the sand blasting pipe column is lifted out, the spray gun is replaced, and then the spray gun is lowered to the position of the next injection point to perform the hydraulic injection hole-making operation.
Specifically, after each injection point completes the hydraulic injection hole making operation, when the sand blasting pipe column is lifted up, if the sand blasting pipe column meets the blockage, fifth clean water is injected into the oil pipe to perform positive circulation blockage removal, and the sand blasting pipe column is lifted up or lowered down at the same time until the blockage removal of the sand blasting pipe column is successful.
Specifically, the method for selecting the injection point in the horizontal section of the coal bed methane reservoir to be constructed specifically comprises the following steps: and arranging an empirical point every 100m on the horizontal section of the coal bed gas reservoir to be constructed, and then selecting points with the maximum total hydrocarbon value as the injection points in the range of 10m on both sides of each empirical point along the horizontal direction.
Specifically, the length of the spray gun used in the step a is 1m, and two groups of nozzles are arranged on the spray gun; the number of the nozzles in each group is 3, and the nozzles are uniformly arranged on the spray gun along the circumferential direction.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the sand blasting pipe column is used for sequentially carrying out hydraulic blasting hole-making operation on a plurality of blasting points of the horizontal section of the coal bed gas reservoir to be constructed, so that the exposed area of the coal bed gas reservoir is increased, the stress of the coal bed gas reservoir is released, the permeability of the coal bed gas reservoir is improved, and the yield of coal bed gas is increased.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sand blasting column provided in an embodiment of the present invention.
The following reference numerals in the drawings are described below:
1, oil pipe;
2, a spray gun;
3, a ball seat;
4 fracturing the lower part of the wellhead;
5 fracturing the upper part of the wellhead;
6, casing the annular space;
7, a cave;
8 a screen hanger;
9 sieve tube.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a reservoir transformation method of a coal bed methane L type horizontal well, which comprises the steps of sequentially carrying out hydraulic jet hole-making operation on a plurality of jet points of a horizontal section of a coal bed methane reservoir to be constructed through a sand blasting pipe column, wherein the sand blasting pipe column comprises an oil pipe 1, a spray gun 2 and a ball seat 3 which are sequentially connected from top to bottom, and the oil pipe 1 is connected with a hanger of a flange below a well head (as shown in figure 1);
the hydraulic jet hole-making operation comprises the following steps:
a. moving the lance 2 to the position of the injection point;
b. opening a casing gate, and injecting first clear water into the oil pipe 1;
c. injecting the sand-carrying liquid into the oil pipe 1; injecting second clean water into the oil pipe 1 for positive circulation sand washing;
d. closing the casing gate, and injecting third clear water into the oil pipe 1; opening a casing gate, and injecting fourth clear water into the oil pipe 1 for positive circulation sand washing;
wherein, the injection amount and the flow rate of the first clear water are minimum, and the injection amount of the fourth clear water is maximum.
It should be noted that, as will be understood by those skilled in the art, the wellhead in the above description is a fractured wellhead, wherein the fractured wellhead is composed of a fractured wellhead lower part 4 and a fractured wellhead lower part 5, and the fractured wellhead lower part 4 is provided with a casing gate.
The respective steps of the hydraulic jet hole forming operation will be described below.
Step a is to move the spray gun 2 to the position of the spray point, which specifically comprises the following steps: after the hydraulic jet cave-making operation is completed on the previous jet point, the well mouth is disassembled after the pressure of the well mouth is reduced to 0MPa, and the spray gun 2 is lifted up to the next jet point position to perform the hydraulic jet cave-making operation.
The number and the position of the injection points of the horizontal section of the coal bed gas reservoir to be constructed directly affect the yield of the coal bed gas, so that the number of the injection points is mainly determined according to the length of the horizontal section of the coal bed gas reservoir to be constructed in order to increase the yield of the coal bed gas and avoid collapse of the coal bed gas reservoir, and the specific steps are as follows: the number of the injection points is equal to the length of the horizontal section of the coal bed gas reservoir to be constructed/100; in the aspect of selecting the position of the injection point, the method specifically comprises the following steps: and arranging an empirical point every 100m on the horizontal section of the coal bed gas reservoir to be constructed, and then selecting points with the maximum total hydrocarbon value as injection points in the range of 10m on both sides of each empirical point along the horizontal direction. It should be noted that the position of each injection point should avoid the screen pipe coupling, because the screen pipe coupling does not have a square hole, clean water or sand-carrying fluid injected into the tubing 1 is not easy to penetrate the screen pipe coupling, which increases the difficulty of hydraulic injection hole-making operation.
And step b, opening the casing gate, and then injecting first clean water into the oil pipe 1. The step is also called as a base fluid replacing shaft stage, namely, clear water is filled into the shaft, and the method is mainly used for measuring the filtration loss of the clear water in a coal bed gas reservoir, whether normal water circulation is established or not can be carried out, and the coal dust or the coal dust in the shaft is discharged to the ground, if the filtration loss of the clear water is high, sand blockage can be caused. Further, since the step is mainly to measure the filtration loss of clean water in the coal bed gas reservoir, the clean water with low flow rate and small injection amount is injected into the oil pipe 1, that is, the injection amount and flow rate of the first clean water are the minimum compared with other injection liquids (sand-carrying liquid, second clean water, third clean water and fourth clean water), for example, according to this embodiment, the clean water is injected into the oil pipe 1 with the minimum injection amount and flow rate compared with other injection liquids (sand-carrying liquid, second clean water, third clean water andand (3) field construction experience, setting parameters of the first clear water as: the injection amount of the first clear water is 5-10 m3(e.g., 5 m)3、6m3、7m3、8m3、9m3、10m3Etc.) at a flow rate of 1m3/min。
Step c is a sand blasting perforation stage, which specifically comprises the following steps: the sand-carrying liquid is injected into an oil pipe 1, sand blasting and perforation are carried out on an injection point through a spray gun 2, a hole is formed in a coal bed gas reservoir, then second clean water is injected into the oil pipe 1 to carry out positive circulation (the second clean water is injected from the oil pipe 1 and then is discharged from a sleeve annulus 6) sand washing, and coal powder or coal dust in a shaft is discharged to the ground to prevent sand blocking.
In order to form a hole with a certain width and depth at an injection point of the coal bed gas reservoir to be constructed and avoid collapse of the coal bed gas reservoir, parameters of the sand-carrying fluid in the embodiment may be set as follows according to production experience: the injection amount of the sand-carrying liquid is 10-20 m3(e.g., 10 m)3、11m3、12m3、13m3、14m3、15m3、16m3、17m3、18m3、19m3、20m3Etc.) with a flow rate of 1.8 to 3m3Min (e.g. 1.8 m)3/min、1.9m3/min、2.0m3/min、2.1m3/min、2.2m3/min、2.3m3/min、2.4m3/min、2.5m3/min、2.6m3/min、2.7m3/min、2.8m3/min、2.9m3/min、3m3Min, etc.), and in addition, in order to ensure good permeability of the coal bed gas reservoir, the sand ratio of the sand-carrying fluid is less than 10% (e.g., 5%, 6%, 7%, 8%, 9%, etc.); likewise, in order to effectively discharge the pulverized coal or coal dust in the well bore to the surface, the parameters of the second clean water can be set as follows: the injection amount of the second clear water is 20-30 m3(e.g., 20 m)3、21m3、22m3、23m3、24m3、25m3、26m3、27m3、28m3、29m3、30m3Etc.) with a flow rate of 1.8 to 3m3Min (e.g. 1.8 m)3/min、1.9m3/min、2.0m3/min、2.1m3/min、2.2m3/min、2.3m3/min、2.4m3/min、2.5m3/min、2.6m3/min、2.7m3/min、2.8m3/min、2.9m3/min、3.0m3Min, etc.).
Step d is a jet cave making stage, in which holes of the coalbed methane reservoir formed in the above step are cut and crushed by high-pressure high-speed jet flow to form a cave 7 (see fig. 1), and then pulverized coal or coal dust in a shaft is discharged to the ground by positive circulation sand washing, specifically: closing the casing gate, injecting third clear water into the oil pipe 1, namely squeezing the third clear water into the oil pipe 1 at high pressure, so that the third clear water passes through the square holes of the sieve tube 9 at high pressure and high speed to squeeze the holes of the coalbed methane reservoir formed in the step, thereby extending the width and length of cracks on the coalbed methane reservoir (namely the holes of the coalbed methane reservoir formed in the step); and then opening a casing gate, injecting fourth clear water into the oil pipe 1 for positive circulation sand washing, and discharging pulverized coal or coal dust in the shaft out of the ground to avoid sand blockage.
Wherein, this embodiment sets the parameters of the third clear water as: the injection amount of the third clear water is 20-30 m3(e.g., 20 m)3、21m3、22m3、23m3、24m3、25m3、26m3、27m3、28m3、29m3、30m3Etc.), the flow rate of the third clear water is 1.8-3 m3Min (e.g. 1.8 m)3/min、1.9m3/min、2.0m3/min、2.1m3/min、2.2m3/min、2.3m3/min、2.4m3/min、2.5m3/min、2.6m3/min、2.7m3/min、2.8m3/min、2.9m3/min、3.0m3Min, etc.); and the injection volume of the fourth clear water is the biggest than the injection volume of other injection fluids (first clear water, sand carrying liquid, second clear water and third clear water) to avoid sand blockage, specifically set the parameters of the fourth clear water as: the injection amount of the fourth clear water is 50-60 m3(e.g., 50 m)3、51m3、52m3、53m3、54m3、55m3、56m3、57m3、58m3、59m3、60m3Etc.), the flow rate of the fourth clear water is 1.8-3 m3Min (e.g. 1.8 m)3/min、1.9m3/min、2.0m3/min、2.1m3/min、2.2m3/min、2.3m3/min、2.4m3/min、2.5m3/min、2.6m3/min、2.7m3/min、2.8m3/min、2.9m3/min、3.0m3Min, etc.).
When the sand blasting pipe column is lifted, if the sand blasting pipe column meets the blocking condition, fifth clean water can be injected into the oil pipe 1 to carry out positive circulation unblocking (namely the fifth clean water is injected from the oil pipe 1 and then is discharged from the sleeve annulus 6, and pulverized coal and coal dust in a shaft are discharged to the ground to solve the problem of sand blocking), and the sand blasting pipe column is lifted or lowered at the same time until the blockage of the sand blasting pipe column is successfully unblocked.
When the above-described hydraulic jet boring work is performed for each jet point, it is determined whether the lance 2 satisfies the construction requirements or not, based on the change in the jet pressure of the lance 2. Because the high-speed fluid of high pressure from spray gun 2 spun can wear and tear the nozzle, in case the nozzle diameter of spray gun 2 increases to a certain extent, not only can cause the wearing and tearing of certain degree to the quad slit of screen pipe 9, and because nozzle diameter grow can reduce the pressure that spray gun 2 spouts to the injection point, just should improve injection volume and the flow of clear water and sand-carrying liquid this moment, in order to satisfy the demand of carrying out the sandblast cave building to the injection point, this kind of way has not only increased the operating cost, but also easy sand is stifled. The method for judging whether the spray gun 2 meets the construction requirements specifically comprises the following steps: when the flow of the first clear water, the sand-carrying liquid, the second clear water, the third clear water or the fourth clear water injected into the oil pipe 1 is kept unchanged and the injection pressure of the spray gun 2 is reduced by less than 25%, the hydraulic injection hole-making operation is continuously carried out on the next injection point; if the injection pressure drop amplitude of the spray gun 2 is more than or equal to 25%, after the current injection hole-making operation is completed, the sand blasting pipe column is lifted out, the spray gun 2 is replaced, and then the spray gun 2 is lowered to the position of the next injection point to perform the hydraulic injection hole-making operation.
The sand blasting pipe column used for hydraulic jet hole making operation consists of an oil pipe 1, a spray gun 2 and a ball seat 3. The tubing 1 is a thickened and chamfered tubing and is convenient to connect with a tubing coupling; the spray gun 2 is provided with a nozzle for carrying out sand blasting and cave building on a spray point of a horizontal section of a coal bed gas reservoir to be constructed; the ball seat 3 is arranged at the lower end part of the sand blasting pipe column, so that when the sand blasting pipe column is put down and sand is blocked, the ball seat 3 can be opened, and clean water is injected into the sleeve annulus 6 to carry out reverse circulation sand washing.
It should be noted that the smaller the length of the spray gun 2 is, the more the construction safety of the coal bed gas reservoir to be constructed can be ensured, so in order to ensure the construction safety of the coal bed gas reservoir to be constructed and not to influence the hydraulic jet cave-making operation on the jet point, the length of the spray gun 2 in the embodiment is 1m, and two groups of nozzles are arranged on the spray gun 2; the number of the nozzles in each group is 3, and the nozzles are uniformly arranged on the spray gun 2 along the circumferential direction. Furthermore, according to field operation experience, the diameter of the nozzle can be set to be 6mm, so that the requirement of high-pressure and high-speed liquid required by hydraulic sand blasting and hole making operation is met, and the loss of liquid flow is avoided.
According to the embodiment of the invention, the hydraulic jet cave-making operation is sequentially carried out on the plurality of jet points of the horizontal section of the coal bed gas reservoir to be constructed through the sand blasting pipe column, so that the exposed area of the coal bed gas reservoir is increased, the stress of the coal bed gas reservoir is released, the permeability of the coal bed gas reservoir is improved, and the yield of the coal bed gas is increased.
The hydraulic jet cave-making operation process of the jet point of the horizontal section of the coal bed gas reservoir to be constructed is described by taking the X coal bed gas L type level as an example.
The X coal bed gas L type horizontal well is drilled in 2015 4-20 days, the well body structure is shown in figure 1, the drilling depth is 1928 m, the actual vertical well depth is 1148.21 m, the deflecting point is 850 m from the well head, the landing point is 1304m from the well head, the horizontal footage is 624 m, the running depth of a screen hanger 8 is 1239-1241.38 m, the running diameter of a horizontal section is 177.8mm of screen 9, and the running depth is 1915.39 m.
a. Moving the lance 2 to the position of the injection point;
7 injection points (624/100 is 6.24, 7 is selected) are arranged at the horizontal section of the coal bed gas reservoir to be constructed, and the specific selection method comprises the following steps: an empirical point is set every 100m in the horizontal section of the coal bed gas reservoir to be constructed (namely empirical points are set at positions 1304m, 1404m, 1504m, 1604m, 1704m, 1804m and 1904m away from a well mouth), and then points with the maximum total hydrocarbon value are selected as injection points according to a comprehensive well record map within a range of 10m away from two sides of each empirical point along the horizontal direction (namely a first injection point 1314 meters away from the well mouth, a second injection point 1405 meters away from the well mouth, a third injection point 1505 meters away from the well mouth, a fourth injection point 1606 meters away from the well mouth, a fifth injection point 1702 meters away from the well mouth, a sixth injection point 1803 meters away from the well mouth and a seventh injection point 1898 meters away from the well mouth).
b. The sleeve gate is opened to inject 5m3Flow rate of 1m3Injecting the first clean water of/min into the oil pipe 1;
c. firstly, the injection amount is 15m3The flow rate is 2.5m3Injecting a sand-carrying liquid with a sand ratio of 7% into the oil pipe 1, carrying out sand blasting and perforation on an injection point through the spray gun 2, and forming a plurality of holes in a horizontal section of the coal bed gas reservoir to be constructed; then the injection amount is 30m3The flow rate is 2.5m3Injecting second clear water of/min into the oil pipe 1 for positive circulation sand washing, so that pulverized coal and coal dust in the shaft are discharged to the ground;
d. closing the casing gate to inject 20m3The flow rate is 2.5m3Injecting third clear water of/min into the oil pipe 1, and cutting and crushing the holes of the coal bed gas reservoir formed in the step c through high-pressure high-speed jet flow to form holes 7; then the casing gate was opened to inject 50m3The flow rate is 2.5m3Injecting fourth clear water of/min into the oil pipe 1 for positive circulation sand washing;
when hydraulic jet hole-making operation is carried out on each jet point, the pressure change of the spray gun 2 is not obvious, and the spray gun 2 is judged to meet the whole construction requirement.
According to the present embodiment provideThe reservoir transformation method of the coal bed gas L type horizontal well successfully completes the transformation of the coal bed gas reservoir by the X coal bed gas L type horizontal well, and coal dust 8m are flushed out3And successfully realizes the sectional sand blasting and cave building of the coal bed.
All the above optional technical solutions may be combined arbitrarily to form the optional embodiments of the present disclosure, and are not described herein again.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The reservoir transformation method of the L-type coal bed methane horizontal well is characterized by comprising the steps of sequentially carrying out hydraulic jet hole-making operation on a plurality of jet points of a horizontal section of a coal bed methane reservoir to be constructed through a sand blasting tubular column, wherein the sand blasting tubular column comprises an oil pipe (1), a spray gun (2) and a ball seat (3) which are sequentially connected from top to bottom, and the oil pipe (1) is connected with a hanger of a flange below a well head;
the hydraulic jet hole-making operation comprises the following steps:
a. -moving the lance (2) to the position of the injection point;
b. opening a casing gate, and injecting first clean water into the oil pipe (1);
c. injecting a sand-carrying fluid into the oil pipe (1); injecting second clean water into the oil pipe (1) for positive circulation sand washing;
d. closing the casing gate, and injecting third clear water into the oil pipe (1); opening the casing gate, and injecting fourth clear water into the oil pipe (1) for positive circulation sand washing;
wherein the injection amount and the flow rate of the first clean water are minimum, and the injection amount of the fourth clean water is maximum;
when the hydraulic jet hole-making operation is carried out on each jet point, whether the spray gun (2) meets the construction requirement is judged according to the jet pressure change condition of the spray gun (2), and the judging method specifically comprises the following steps:
when the hydraulic jet hole-making operation is carried out on the jet points, under the condition that the flow of the first clear water, the sand-carrying liquid, the second clear water, the third clear water or the fourth clear water injected into the oil pipe (1) is kept unchanged, if the jet pressure of the spray gun (2) is reduced by less than 25%, the hydraulic jet hole-making operation is continuously carried out on the next jet point;
and if the injection pressure drop amplitude of the spray gun (2) is more than or equal to 25%, after the current injection hole-making operation is finished, the sand blasting pipe column is lifted out, the spray gun (2) is replaced, and then the spray gun (2) is lowered to the position of the next injection point to perform the hydraulic injection hole-making operation.
2. The method according to claim 1, wherein the parameters of the first clear water in the step b are set as follows: the injection amount of the first clear water is 5-10 m3Flow rate of 1m3/min。
3. The method according to claim 2, wherein the parameters of the first clear water in step b are set as: the injection amount of the first clear water is 5m3Flow rate of 1m3/min。
4. The method of claim 1, wherein the parameters of the sand-carrying fluid in step c are set as: the injection amount of the sand carrying liquid is 10-20 m3The flow rate is 1.8-3 m3Min, and the sand ratio is less than 10 percent;
and the parameters of the second clear water are as follows: the injection amount of the second clear water is 20-30 m3The flow rate is 1.8-3 m3/min。
5. The method of claim 4, wherein the parameters of the sand-carrying fluid in step c are set as: the injection amount of the sand-carrying liquid is 15m3Flow rate of 2.53Min, and the sand ratio is 7 percent;
and the parameter of the second clear water is set as: the injection amount of the second clear water is 30m3The flow rate is 2.5m3/min。
6. The method according to claim 1, wherein the parameters of the third clear water in the step d are set as follows: the injection amount of the third clear water is 20-30 m3The flow rate is 1.8-3 m3/min；
And the parameters of the fourth clear water are set as follows: the injection amount of the fourth clear water is 50-60 m3The flow rate is 1.8-3 m3/min。
7. The method according to claim 6, wherein the parameters of the third clear water in the step d are set as follows: the injection amount of the third clear water is 20m3The flow rate is 2.5m3/min；
And the parameters of the fourth clear water are set as follows: the injection amount of the fourth clear water is 50m3The flow rate is 2.5m3/min。
8. The method according to claim 1, characterized in that when lifting up the sand blasting pipe column after completing the hydraulic jet hole making operation at each injection point, if the sand blasting pipe column meets the blockage, fifth clean water is injected into the oil pipe (1) for positive circulation blockage removal, and simultaneously the sand blasting pipe column is lifted up or lowered down until the sand blasting pipe column blockage removal is successful.
9. The method according to claim 1, wherein the method for selecting the injection point in the horizontal section of the coal bed methane reservoir to be constructed specifically comprises the following steps: and arranging an empirical point every 100m on the horizontal section of the coal bed gas reservoir to be constructed, and then selecting points with the maximum total hydrocarbon value as the injection points in the range of 10m on both sides of each empirical point along the horizontal direction.
10. The method according to claim 1, characterized in that the lance (2) used in step a has a length of 1m and two sets of nozzles are provided on the lance (2); the number of the nozzles in each group is 3, and the nozzles are uniformly distributed on the spray gun (2) along the circumferential direction.
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| CN109505655A (en) * | 2019-01-16 | 2019-03-22 | 河南理工大学 | A kind of method of construction of salt hole air reserved storeroom |
| CN112780248B (en) * | 2019-11-04 | 2022-08-05 | 中国石油天然气股份有限公司 | Coal bed gas horizontal well and construction method thereof |
| CN113123771A (en) * | 2020-01-16 | 2021-07-16 | 中国石油天然气股份有限公司 | Fracturing method of coal bed gas cluster well |
| CN111520119B (en) * | 2020-04-28 | 2022-04-08 | 中煤科工集团西安研究院有限公司 | Method for efficiently extracting coal bed gas by staged fracturing of large-spacing thin coal seam group multi-bottom horizontal well |
| CN111905906B (en) * | 2020-07-29 | 2021-07-06 | 中国石油化工股份有限公司 | Centrifugal separation and mechanical crushing type coal dust cleaning system and working method thereof |
| CN111980706B (en) * | 2020-09-02 | 2022-03-01 | 中煤科工集团西安研究院有限公司 | Sectional composite coal drawing method for ground horizontal well |
| CN112302578B (en) * | 2020-10-30 | 2021-10-26 | 中国矿业大学 | Method for exploiting structural coal bed gas by horizontal well stress release |
| CN114439428B (en) * | 2021-12-30 | 2023-08-25 | 中煤科工集团西安研究院有限公司 | Enhanced extraction method for coal bed gas horizontal well of coal group under goaf group |
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