CN110805396A - Drilling track control method for horizontal well of thin sandstone oil and gas reservoir - Google Patents
Drilling track control method for horizontal well of thin sandstone oil and gas reservoir Download PDFInfo
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- E21B7/00—Special methods or apparatus for drilling
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Abstract
The invention discloses a drilling track control method for a horizontal well of a thin sandstone oil and gas reservoir, and belongs to the field of oil and gas exploitation. The drilling track control method for the horizontal well of the thin sandstone reservoir comprises the following steps: after a target oil layer is determined, a drilling tool assembly and gamma logging equipment arranged at the rear end of a drill bit are put in, and whether the drill bit drills into the target oil layer is judged according to the value range of a gamma curve detected by the gamma logging equipment; after the drill bit drills into a target oil layer, the drill bit is controlled to alternately drill at a first specified angle and a second specified angle according to the value range of a gamma curve detected by gamma logging equipment until the drill bit penetrates out of the target oil layer; the first specified angle and the second specified angle are both: an acute angle is formed between the drilling track of the drill bit and the axis of the target oil layer; the method can enable the well track to be positioned in the middle of the target oil layer, and is beneficial to improving the oil gas exploitation efficiency on the premise of saving time and labor.
Description
Technical Field
The invention relates to the field of oil and gas exploitation, in particular to a drilling track control method for a horizontal well of a thin sandstone oil and gas reservoir.
Background
A thin sandstone reservoir refers to a hydrocarbon reservoir less than 3m thick, which is mostly a horizontal hydrocarbon reservoir. With the continuous deepening of the exploration and development degree of oil and gas fields in China, the thin sandstone oil and gas reservoir becomes an exploration target. The horizontal well drilling track control method is the key for ensuring the success of horizontal well drilling, so that the horizontal well drilling track control method for the thin sandstone oil and gas reservoir is very necessary.
In the related art, the horizontal form and position of a target oil layer are inferred according to seismic profile geological interpretation obtained from a geological well in an oil field to be explored, then a drilling tool assembly and a comprehensive logging instrument arranged at the rear end of a drill bit are put into the horizontal form and position, and the drill bit is controlled to drill into the target oil layer. In the drilling process, the whole drilling process is monitored in real time through the comprehensive logging instrument, so that an operator can control the drilling track of the drill bit conveniently.
The inventors found that the related art has at least the following problems:
in the related art, the specific positions of the target oil layer and the drill bit can only be estimated according to the lagged logging data or data acquired by the comprehensive logging instrument, so that the drilling trajectory is easy to deviate from the target oil layer.
Disclosure of Invention
The embodiment of the invention provides a drilling track control method for a horizontal well of a thin sandstone oil and gas reservoir, which can solve the technical problem. The specific technical scheme is as follows:
the embodiment of the invention provides a drilling track control method for a horizontal well of a thin sandstone oil and gas reservoir, which comprises the following steps:
after a target oil layer is determined, a drilling tool assembly and gamma logging equipment arranged at the rear end of a drill bit are put in, and whether the drill bit drills into the target oil layer is judged according to the value range of a gamma curve detected by the gamma logging equipment;
after the drill bit drills into the target oil layer, the drill bit is controlled to alternately drill at a first specified angle and a second specified angle according to the value range of a gamma curve detected by the gamma logging equipment until the drill bit penetrates out of the target oil layer;
the first specified angle and the second specified angle are both: an acute angle is formed between the drilling track of the drill bit and the axis of the target oil layer.
In one possible design, the gamma curves include an upper gamma curve and a lower gamma curve;
the range of the gamma curve comprises: a high-value domain of the upper gamma curve, a low-value domain of the upper gamma curve, a high-value domain of the lower gamma curve, and a low-value domain of the lower gamma curve.
In one possible design, the range of the low range of the upper gamma curve and the range of the low range of the lower gamma curve are both: 45API to 74 API;
the range of the high value range of the upper gamma curve and the range of the high value range of the lower gamma curve are both: 75API to 200 API.
In one possible design, the determining whether the drill bit has drilled into the target reservoir according to a range of a gamma curve detected by the gamma logging tool includes:
determining that the drill bit is close to a top plate of the target reservoir when a value range of the upper gamma curve is within a range of a high value range of the upper gamma curve and a value range of the lower gamma curve is within a range of a low value range of the lower gamma curve;
determining that the drill bit is in the target reservoir when the upper gamma curve has a range of values within a low range of values of the upper gamma curve and the lower gamma curve has a range of values within a low range of values of the lower gamma curve;
determining that the drill bit is not in the target reservoir when the value range of the upper gamma curve is within the range of the high value range of the upper gamma curve and the value range of the lower gamma curve is within the range of the high value range of the lower gamma curve.
In one possible design, the method for controlling the drilling trajectory of the horizontal well of the thin sandstone reservoir further comprises the following steps:
and after the drill bit penetrates out of the target oil layer, controlling the drill bit to continuously drill for a first specified distance along the axis of the target oil layer.
In one possible design, the length over which the drill bit is controlled to drill at the first specified angle is equal to the length over which the drill bit is controlled to drill at the second specified angle.
In one possible design, the first prescribed angle and the second prescribed angle are both 0 ° to 7 °.
In one possible design, the axis of the target reservoir is at an angle of-15 ° to the horizontal.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
according to the drilling track control method for the horizontal well of the thin-layer sandstone oil and gas reservoir, provided by the embodiment of the invention, the specific position of the drill bit can be accurately judged through the value range of the gamma curve detected by the gamma logging equipment, the change of the lithology of the stratum can be pre-judged in advance, and an effective technical means and a field implementation method are provided for timely controlling or adjusting the track of the well hole. According to the value range of a gamma curve detected by gamma logging equipment, the drill bit is controlled to alternately drill at a first designated angle and a second designated angle, so that the track of a well hole is similar to a wave shape, the drill bit is prevented from upwards penetrating through a top plate of a target oil layer or downwards penetrating through a bottom plate of the target oil layer, and the drill bit can drill into the target oil layer to the maximum extent. By the method, the well track can be positioned in the target oil layer, and the oil gas exploitation efficiency is improved on the premise of saving time and labor.
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 flow chart of a drilling trajectory control method of a horizontal well of a thin sandstone oil and gas reservoir, which is provided by the embodiment of the invention;
FIG. 2 is a schematic illustration of an angle between a drill bit trajectory and an axis of a target reservoir provided by an embodiment of the present invention;
FIG. 3 is a schematic illustration of the well path at a dip angle of 0 provided in example 1;
FIG. 4 is a schematic illustration of the wellbore trajectory at a dip of 2 provided in example 2;
FIG. 5 is a schematic representation of the well trajectory at-2 dip angle for the reservoir provided in example 3.
Detailed Description
Unless defined otherwise, all technical terms used in the examples of the present invention have the same meaning as commonly understood by one of ordinary skill in the art. Before further detailed description of embodiments of the present invention, definitions are given for some terms used to understand examples of the present invention.
When the gamma rays meet radioactive substances in the rock stratum, photoelectric effect, Compton-Wu training effect and the effect of forming electrons and the like in different forms occur, so that the parameters of the rock stratum such as the mud content, the permeability and the like can be detected by utilizing the gamma rays. The data information detected by the gamma rays is drawn into a gamma curve, and various properties of the rock stratum can be evaluated according to the value range of the gamma curve.
The axis of the target reservoir refers to: a straight line crossing the middle of the target reservoir.
The thickness of the thin-layer sandstone oil-gas reservoir is small, the thickness of the thin-layer sandstone oil-gas reservoir is generally 2-3 m, the horizontal general development is heterogeneous, a lithologic transverse mutation zone or a compact lithologic zone is easy to form, and the control in a horizontal well design scheme is difficult. At present, the degree of shallow exploration and development in an oil field is generally improved, most potential target layers are buried deeply, the well depth exceeds 3500m, and various seismic characteristic attribute parameters are difficult to describe quantitatively due to the control of quality and precision limits of three-dimensional seismic data. Aiming at horizontal drilling of a thin sandstone oil and gas reservoir, two possibilities of drilling an oil layer from a top plate (namely a top wall) of the oil layer and a bottom plate (namely a bottom wall) of the oil layer exist in a well track, and a key is to make a timely and accurate judgment on the drilling track of a drill bit, so that the situation that the well track is drilled and far away from the oil layer is avoided in the drilling process of a horizontal well. Therefore, the embodiment of the invention provides a drilling track control method for a horizontal well of a thin sandstone oil and gas reservoir.
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 method for controlling a horizontal well drilling track of a thin sandstone oil and gas reservoir, which comprises the following steps of:
the first specified angle and the second specified angle are both: the acute angle between the drilling path of the drill bit and the axis of the target reservoir.
It should be noted that the method provided by the embodiment of the present invention may also be used in combination with other devices, such as a device for controlling the drilling angle, the drilling distance, the drilling speed, and the like of the drill bit.
The drill bit is controlled to alternately drill at the first designated angle and the second designated angle, so that the track of the well hole is similar to a wave shape, and the drill bit is prevented from upwards penetrating out of a top plate of a target oil layer or downwards penetrating out of a bottom plate of the target oil layer.
The first designated angle and the second designated angle are both acute angles between the trajectory of the drill bit and the axis of the target reservoir, as shown in fig. 2, the first designated angle is α and the second designated angle is β.
According to the drilling track control method for the horizontal well of the thin-layer sandstone oil and gas reservoir, provided by the embodiment of the invention, the specific position of the drill bit can be accurately judged through the value range of the gamma curve detected by the gamma logging equipment, the change of the lithology of the stratum can be pre-judged in advance, and an effective technical means and a field implementation method are provided for timely controlling or adjusting the track of the well hole. According to the value range of a gamma curve detected by gamma logging equipment, the drill bit is controlled to alternately drill at a first designated angle and a second designated angle, so that the track of a well hole is similar to a wave shape, the drill bit is prevented from upwards penetrating through a top plate of a target oil layer or downwards penetrating through a bottom plate of the target oil layer, and the drill bit can drill into the target oil layer to the maximum extent. By the method, the well track can be positioned in the target oil layer, and the oil gas exploitation efficiency is improved on the premise of saving time and labor.
It is understood that drilling tool assemblies include drill strings, drill bits, and the like. Gamma logging equipment is disposed at the back end of the drill bit.
In step 101, a gamma logging device is commonly used in the art, for example, a gamma logging device provided by Schlumberger (Schlumberger) of the united states of america, which can simultaneously measure an upper gamma curve and a lower gamma curve. The device is arranged at the rear end of the drill bit (the end of the drilling direction of the drill bit is the front end). In the drilling process of the drill bit, the gamma logging equipment detects radioactive elements in the rock stratum in real time and transmits corresponding data information to the ground controller, and the more rock mud content is, the stronger the radioactivity is, and the higher the value range of a gamma curve is. Therefore, the relation between the position of the drill bit and the oil reservoir can be judged according to the value range of the gamma curve. The position of the upper part of the drill bit can be determined according to the value range of the upper gamma curve, the position of the lower part of the drill bit can be determined according to the value range of the lower gamma curve, and the position of the drill bit can be accurately determined by combining the upper gamma curve and the lower gamma curve.
Wherein the gamma curve comprises an upper gamma curve and a lower gamma curve; the range of the gamma curve includes: the high value range of the upper gamma curve, the low value range of the upper gamma curve, the high value range of the lower gamma curve and the low value range of the lower gamma curve.
Through the cooperation of the upper gamma curve, the lower gamma curve and the value range thereof, the specific position of the drill bit can be accurately determined, and the change of the formation lithology can be pre-judged in advance.
It should be noted that the American Petroleum Institute (abbreviated as API) specifies the universal radioactive count rate unit of the world as "API". The unit is that the difference of the radioactivity value of the high-radioactivity stratum and the low-radioactivity stratum in the standard calibration well is divided into 200API units on average, and the API units are used as the standard units.
The range of the low value range of the upper gamma curve and the range of the low value range of the lower gamma curve are both: 45API to 74API, for example, 45API, 48API, 51API, 54API, 57API, 60API, 63API, 66API, 69API, 73API, 74API and the like; the range of the high value range of the upper gamma curve and the range of the high value range of the lower gamma curve are both: examples of the 75API to 200API include 75API, 85API, 95API, 105API, 115API, 125API, 135API, 145API, 155API, 165API, 175API, 185API, 195API, and 200 API.
When the value ranges of the upper gamma curve and the lower gamma curve are in the low value range, the position detected by the gamma logging equipment is a target oil layer. When the value ranges of the upper gamma curve and the lower gamma curve are in the high value range, the position detected by the gamma logging equipment is a mud rock stratum. The specific position of the drill bit can be simply and conveniently judged through the high value range and the low value range of the upper gamma curve and the lower gamma curve.
As an example, in step 101, determining whether the drill bit has drilled into the target reservoir according to the range of the gamma curve detected by the gamma logging device includes:
when the value range of the upper gamma curve is within the range of the high value range of the upper gamma curve and the value range of the lower gamma curve is within the range of the low value range of the lower gamma curve, it is determined that the drill bit is close to the top plate of the target reservoir.
Determining that the drill bit is in the target reservoir when the value range of the upper gamma curve is within the range of the lower value range of the upper gamma curve and the value range of the lower gamma curve is within the range of the lower value range of the lower gamma curve.
When the value range of the upper gamma curve is within the range of the high value range of the upper gamma curve, and the value range of the lower gamma curve is within the range of the high value range of the lower gamma curve, it is determined that the drill bit is not in the target reservoir.
By analyzing the value ranges of the upper gamma curve and the lower gamma curve, the specific position of the drill bit can be analyzed with high precision, the lithology change of the stratum can be predicted in advance, technical guidance is provided for controlling or adjusting the drilling track of the drill bit in time, and the drilling in a target oil layer is facilitated to the maximum extent.
As an example, when the value range of the upper gamma curve is greater than 75API, and the value range of the lower gamma curve is greater than 75API, it is indicated that the lithology of the formation where the drill bit is located is mudstone, and the drill bit has not entered the target reservoir.
When the value range of the upper gamma curve is larger than 75API and the value range of the lower gamma curve is within 45 API-74 API, the lithology of the stratum where the drill bit is located is sandstone, the drill bit is located on the top plate of the target oil layer, and the well track is located at the top of the target oil layer.
When the value range of the upper gamma curve is within 45 API-74 API, and the value range of the lower gamma curve is within 45 API-74 API, the lithology of the stratum where the drill bit is located is sandstone, the drill bit is located in a target oil layer, and the well track is located in the target oil layer.
When the value range of the upper gamma curve is within 45-74 API and the value range of the lower gamma curve is larger than 75API, the lithology of the stratum where the drill bit is located is sandstone, the drill bit is about to leave a target oil layer, and the drill bit and the well track are located at the bottom of the target oil layer.
When the value range of the upper gamma curve is larger than 75API, and the value range of the lower gamma curve is larger than 75API, the lithology of the stratum where the drill bit is located is mudstone, and the drill bit leaves a target oil layer.
As an example, the method for controlling the drilling trajectory of the horizontal well in the thin sandstone reservoir further includes:
and after the drill bit penetrates out of the target oil layer, controlling the drill bit to continuously drill for a first specified distance along the axis of the target oil layer.
In this way, the drill bit can be easily retracted after drilling is complete.
In view of the fact that the drill bit can be easily controlled to drill in a wave-like manner in the target reservoir and the top and bottom plates of the target reservoir are not easily touched, in the embodiment of the present invention, the length of drilling by the control drill bit at the first designated angle is equal to the length of drilling by the control drill bit at the second designated angle.
Considering that the drill bit is controlled to drill at the first designated angle and the second designated angle during the drilling process, the drill bit does not easily touch the top plate and the bottom plate of the target oil layer, the first designated angle and the second designated angle may be 0 ° to 7 °, for example, 0 °, 1 °, 2 °, 3 °, 4 °, 5 °, 6 °, 7 °, and the like.
In consideration of the accuracy of the application of the method for controlling the drilling track of the horizontal well of the thin sandstone oil-gas reservoir, provided by the embodiment of the invention, the included angle between the axis of the target oil layer and the horizontal line can be-15 degrees, for example, -15 degrees, -13 degrees, -11 degrees, -9 degrees, -7 degrees, -5 degrees, -3 degrees, -1 degree, 0 degree, 1 degree, 3 degrees, 5 degrees, 7 degrees, 9 degrees, 11 degrees, 13 degrees, 15 degrees and the like.
When the axis of the target oil layer is inclined downward along the drilling direction of the drilling trajectory, the included angle between the axis of the target oil layer and the horizontal line is a positive number. When the axis of the target oil layer inclines upwards along the drilling direction of the drilling track, the included angle between the axis of the target oil layer and the horizontal line is a negative number.
The angle between the axis of the target reservoir and the horizontal may also be referred to as the "reservoir dip angle".
The present invention will be further described below by way of specific examples.
Example 1
The embodiment provides a horizontal well drilling track control method for a target oil layer with an oil layer inclination angle of 0 degrees, which comprises the following steps:
and when the dip angle of the oil layer of the target oil layer is inferred to be 0 degrees through the geological interpretation of the seismic section of the target oil layer, a drilling tool assembly and gamma logging equipment arranged at the rear end of the drill bit are put into the drill bit, the drill bit is controlled to drill into the rock layer, and when the value range of an upper gamma curve is 75 API-200 API and the value range of a lower gamma curve is 45 API-74 API, the drill bit can be judged to be close to the target oil layer O. Further, when the upper gamma curve has a range of 45API to 74API, it can be determined that the drill bit has penetrated from a point a1 into the target reservoir O. According to the geological design scheme and the design requirement of the well track, and the change and explanation of the value range of the upper gamma curve and the lower gamma curve, the change of the horizontal section well inclination angle is adjusted in time, the drill bit is controlled to drill alternately at a first specified angle and a second specified angle, the first specified angle and the second specified angle can be 0 degree, 1 degree, 2 degree, 3 degree, 4 degree and 5 degree in sequence, so that the value range of the upper gamma curve and the value range of the lower gamma curve are both in 45 API-74 API until the upper gamma curve and the lower gamma curve penetrate out of the target oil reservoir O. Wherein, when the value range of the upper gamma curve is 75 API-200 API, and the value range of the lower gamma curve is 75 API-200 API, the drill bit can be judged to drill out the target oil reservoir O. Wherein the position of the drill bit drilling away from the target oil reservoir O is B1, and the drill bit drills to D1.
According to the above method, the drill bit may be prevented from being inclined upward in the C1 → E1 direction and drilling the target reservoir O during the drilling of the target reservoir O, or from being inclined downward in the C1 → F1 direction and drilling the target reservoir O. Finally, the borehole trajectory A1 → C1 → B1 as shown in FIG. 3 is obtained.
Example 2
The embodiment provides a horizontal well drilling track control method for a target oil layer with an oil layer inclination angle of 2 degrees, which comprises the following steps:
and when the reservoir inclination angle of the target reservoir O is deduced to be 2 degrees through the geological interpretation of the seismic section of the target reservoir, a drilling tool assembly and gamma logging equipment arranged at the rear end of the drill bit are put into the reservoir, the drill bit is controlled to drill into the rock stratum, and when the value range of an upper gamma curve is 75 API-200 API and the value range of a lower gamma curve is 45 API-74 API, the drill bit can be judged to be close to the target reservoir O. Further, when the upper gamma curve has a range of 45API to 74API, it can be determined that the drill bit has penetrated from a point a2 into the target reservoir O. According to the geological design scheme and the design requirement of the well track, and the change and explanation of the value range of the upper gamma curve and the lower gamma curve, the change of the horizontal section well inclination angle is adjusted in time, the drill bit is controlled to drill alternately at a first specified angle and a second specified angle, the first specified angle and the second specified angle can be 2 degrees, 3 degrees, 4 degrees, 5 degrees, 6 degrees and 7 degrees in sequence, so that the value range of the upper gamma curve and the value range of the lower gamma curve are both in 45 API-74 API until the upper gamma curve and the lower gamma curve penetrate out of the target oil reservoir O. Wherein, when the value range of the upper gamma curve is 75 API-200 API, and the value range of the lower gamma curve is 75 API-200 API, the drill bit can be judged to drill out the target oil reservoir O. Wherein the position of the drill bit drilling away from the target oil reservoir O is B2, and the drill bit drills to D2.
According to the above method, the drill bit may be prevented from being inclined upward in the C2 → E2 direction and drilling the target reservoir O during the drilling of the target reservoir O, or from being inclined downward in the C2 → F2 direction and drilling the target reservoir O. Finally, the borehole trajectory A2 → C2 → B2 as shown in FIG. 4 is obtained.
Example 3
The embodiment provides a horizontal well drilling track control method for a target oil layer with an oil layer inclination angle of-2 degrees, which comprises the following steps:
and when the dip angle of the oil layer of the target oil layer is deduced to be-2 degrees through the geological interpretation of the seismic section of the target oil layer, a drilling tool assembly and gamma logging equipment arranged at the rear end of the drill bit are put into the drill bit, the drill bit is controlled to drill into the rock layer, and when the value range of an upper gamma curve is 75 API-200 API and the value range of a lower gamma curve is 45 API-74 API, the drill bit can be judged to be close to the target oil layer O. Further, when the upper gamma curve has a range of 45API to 74API, it can be determined that the drill bit has penetrated from a point a3 into the target reservoir O. According to the geological design scheme and the design requirement of the well track, and the change and explanation of the value range of the upper gamma curve and the lower gamma curve, the change of the horizontal section well inclination angle is adjusted in time, the drill bit is controlled to drill alternately at a first specified angle and a second specified angle, the first specified angle and the second specified angle can be 2 degrees, 1 degree, 0 degree, 1 degree, 2 degrees and 3 degrees in sequence, so that the value range of the upper gamma curve and the value range of the lower gamma curve are both within 45 API-74 API until the upper gamma curve and the lower gamma curve penetrate out of the target oil reservoir O. Wherein, when the value range of the upper gamma curve is 75 API-200 API, and the value range of the lower gamma curve is 75 API-200 API, the drill bit can be judged to drill out the target oil reservoir O. Wherein the position of the drill bit drilling away from the target oil reservoir O is B3, and the drill bit drills to D3.
According to the above method, the drill bit may be prevented from being inclined upward in the C3 → E3 direction and drilling the target reservoir O during the drilling of the target reservoir O, or from being inclined downward in the C3 → F3 direction and drilling the target reservoir O. Finally, the borehole trajectory A3 → C3 → B3 as shown in FIG. 5 is obtained.
In conclusion, the drilling track control method for the horizontal well of the thin-layer sandstone oil and gas reservoir, provided by the embodiment of the invention, can enable the well track to be positioned in the middle of the target oil layer, and is beneficial to improving the oil and gas exploitation efficiency on the premise of saving time and labor.
The above description is only an illustrative embodiment of the present invention, and should not be taken as limiting the scope of the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A drilling track control method for a horizontal well of a thin-layer sandstone oil and gas reservoir is characterized by comprising the following steps:
after a target oil layer is determined, a drilling tool assembly and gamma logging equipment arranged at the rear end of a drill bit are put in, and whether the drill bit drills into the target oil layer is judged according to the value range of a gamma curve detected by the gamma logging equipment;
after the drill bit drills into the target oil layer, the drill bit is controlled to alternately drill at a first specified angle and a second specified angle according to the value range of a gamma curve detected by the gamma logging equipment until the drill bit penetrates out of the target oil layer;
the first specified angle and the second specified angle are both: an acute angle is formed between the drilling track of the drill bit and the axis of the target oil layer.
2. The method of controlling the drilling trajectory of a horizontal well in a thin sandstone reservoir of claim 1, wherein the gamma curve comprises an upper gamma curve and a lower gamma curve;
the range of the gamma curve comprises: a high-value domain of the upper gamma curve, a low-value domain of the upper gamma curve, a high-value domain of the lower gamma curve, and a low-value domain of the lower gamma curve.
3. The method of controlling the drilling trajectory of a horizontal well in a thin sandstone reservoir of claim 2, wherein the range of the low-value domain of the upper gamma curve and the range of the low-value domain of the lower gamma curve are both: 45API to 74 API;
the range of the high value range of the upper gamma curve and the range of the high value range of the lower gamma curve are both: 75API to 200 API.
4. The method for controlling the drilling trajectory of the horizontal well in the thin sandstone oil and gas reservoir according to claim 2, wherein the step of judging whether the drill bit drills into the target oil reservoir according to the value range of the gamma curve detected by the gamma logging equipment comprises the following steps:
determining that the drill bit is close to a top plate of the target reservoir when a value range of the upper gamma curve is within a range of a high value range of the upper gamma curve and a value range of the lower gamma curve is within a range of a low value range of the lower gamma curve;
determining that the drill bit is in the target reservoir when the upper gamma curve has a range of values within a low range of values of the upper gamma curve and the lower gamma curve has a range of values within a low range of values of the lower gamma curve;
determining that the drill bit is not in the target reservoir when the value range of the upper gamma curve is within the range of the high value range of the upper gamma curve and the value range of the lower gamma curve is within the range of the high value range of the lower gamma curve.
5. The method of controlling the drilling trajectory of the thin sandstone reservoir horizontal well as claimed in claim 1, wherein the method further comprises:
and after the drill bit penetrates out of the target oil layer, controlling the drill bit to continuously drill for a first specified distance along the axis of the target oil layer.
6. The method of controlling the drilling trajectory of a horizontal well in a thin sandstone reservoir according to claim 1, wherein the length of the drill bit drilling at a first specified angle is controlled to be equal to the length of the drill bit drilling at a second specified angle.
7. The method of controlling the drilling trajectory of the horizontal well in the thin sandstone reservoir of any of claims 1-6, wherein the first specified angle and the second specified angle are both 0 ° to 7 °.
8. The method for controlling the drilling track of the horizontal well of the thin sandstone oil and gas reservoir according to any one of claims 1 to 6, wherein the included angle between the axis of the target oil layer and the horizontal line is-15 degrees to 15 degrees.
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