Three-dimensional (3D) horizontal well borehole track controlling method

A control method and wellbore trajectory technology, applied in wellbore/well components, directional drilling, earth-moving drilling, etc., can solve the problem of high cost and achieve the effect of low cost, easy construction and easy operation

Active Publication Date: 2015-04-01

CHINA PETROLEUM & CHEM CORP +1

7 Cites 37 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0004] The object of the present invention is a method for controlling the borehole trajectory of a three-dimensional horizontal well, so as to solve the problem t...

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Method used

As can be seen from Fig. 1, Fig. 2 and Fig. 3, the real drilling trajectory is very consistent with the design, indicating that the trajectory control accuracy is very high, and the co...

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Abstract

The invention relates to a three-dimensional (3D) horizontal well borehole track controlling method, and belongs to the technical field of oil and gas well drilling. The method comprises the steps of determining well drilling parameters according to well drilling equipment and formation lithology; measuring a borehole parameter by measurement-while-drilling tools, revising a formation vertical depth by using geological logging, designing points to be drilled according to known measuring points, regarding the vertical depth as a control target, continuously revising a 3D well section track until drilling to a 3D well section end turning direction; revising a target entering point vertical depth by using geological logging again, performing two-dimensional well drilling to a target point, and performing horizontal section well drilling by using reservoir lithology and horizontal section well inclining determination drilling tool assembly. The 3D horizontal well borehole track controlling method disclosed by the invention has the advantages that firstly the conventional well drilling and directional equipment is used, the cost is quite low, and promotional values are available; secondly, geosteering is performed by using conventional logging, the track is revised continuously, and the shooting precision is greatly improved; thirdly, the design and construction are integrated, the site directional construction is operated easily, and directional engineers construct conveniently.

Application Domain

SurveyDirectional drilling

Technology Topic

Natural gasLogging +6

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Examples

Experimental program(1)

Example Embodiment

[0039] The specific embodiments of the present invention will be further described below in conjunction with the drawings.

[0040] The following takes a three-dimensional horizontal well in the Jinghe Oilfield of the Ordos Basin as an example to describe in detail the specific implementation process of the three-dimensional horizontal well trajectory control method of the present invention. This well uses ZJ40 Roman drilling rig, conventional "screw drilling tool + MWD measurement system", F-1300 drilling pump, and no top drive.

[0041] 1. According to the drilling geological design, carry out the drilling engineering design for the horizontal well. This embodiment adopts a six-segment well trajectory, including one-dimensional vertical well section, two-dimensional increase deflection section, three-dimensional well section, two-dimensional stable deflection section, two-dimensional increase deflection section and two-dimensional horizontal section, among which horizontal well two-dimensional well section It adopts the combined design of circular arc and straight sections, the constant tool surface design is adopted for the 3D well section, the curvature value of the 3D well section is the same as that of the 2D well section, and the two-dimensional well section and three-dimensional well section are adopted from the inclination point to the target point A. The well section and the two-dimensional well section are combined sequentially. In this example, the deflection point is 951.48m, the borehole curvature is 4.9°/30m, and the three-dimensional well section is designed with a constant tool face, and the tool face angle is 299.70°. The specific parameters are shown in Table 1. .

[0042] Table 1

[0043]

[0044] 2. According to the designed wellbore curvature of 4.9°/30m, select the drill tool assembly in the build section so that the build rate of the drill set assembly is higher than the curvature of the wellbore. The drill tool assembly in this embodiment is: Φ215.9mm three-thread drill bit + 1.5° screw + non-magnetic drill taper + MWD measurement tool + Φ127mm drill pipe + Φ127mm weighted drill pipe and Φ127mm drill pipe string, selected according to the above For the drill tool assembly in the build-up section, the predicted tool build-up rate is 7.75°/30m.

[0045] 3. Drilling to 951.48m from the deflection point, turning on the centrifuge after turning on the vibrating screen, desander and desilter, the drilling fluid loses water within 5ml and the sand content is within 0.5%.

[0046] 4. Determine the pump displacement according to the selected drilling pump model, drill bit model, power drilling tool and critical annulus displacement. The pump displacement range is as follows:

[0047] max(Q pmin ,Q bmin ,Q smin ,Q cmin )≤Q≤min(Q pmax ,Q bmax ,Q smax )

[0048] Where Q is the pump displacement in cubic meters per second; Q pmax ,Q pmin Is the maximum and minimum displacement of the drilling pump, in cubic meters per second; Q bmax ,Q bmin Is the maximum and minimum displacement of the selected drill bit, the unit is cubic meters/second; Q smax ,Q smin Is the maximum displacement and minimum displacement of the selected power drilling tool, in cubic meters per second; Q cmin It is the critical annulus displacement in cubic meters per second.

[0049] The horizontal well in this embodiment uses F-1300 drilling pump, tri-cone drill bit and 1.5° vertical screw. According to the pump displacement range formula, the pump displacement is determined to be 28-32L/s.

[0050] 5. Determine the WOB according to the stratum lithology and the selected bit model and power drill model.

[0051] The WOB values are as follows:

[0052] W=min(W b ,W s ,W q )

[0053] Where W is weight on bit, the unit is Newton; W b Recommended weight on bit for the selected bit, in Newtons; W s Recommended weight on bit for the selected power drilling tool, the unit is Newton; W q It is the weight on bit when the pipe string buckles, and the unit is Newton.

[0054] In this example, the skew section encountered the Jurassic Yan'an Formation and the Triassic Yanchang Formation. According to the selected bit model HJ518G and screw model (converted to engineering unit), the weight on bit is determined to be 6-10 tons.

[0055] 6. According to the design initial azimuth angle of 59°, start the directional deflection, and carry out the two-dimensional well section drilling. With the vertical depth as the control target, drill to the designed vertical depth of 1172.03m and the well depth of 1190m. Through the analysis of actual drilling data, the composite time is produced. The slope is 0.7-1.2°/30m, and the slope is 5.5-7.0°/30m when sliding, which meets the construction requirements.

[0056] 7. After the completion of the two-dimensional well section drilling, use the logging while drilling tool to measure the bottom hole depth, the azimuth of the inclination and the azimuth of the inclination, and calculate the actual drilling vertical depth, east-west coordinates and north-south coordinates of the point. Measured by MWD, the bottom hole depth at the end of the first two-dimensional well section is 1191.84m, the inclination angle is 37°, and the inclination azimuth angle is 59.29°. After calculation, the actual drilling vertical depth is 1175.26m, east-west coordinates 69.66m, north-south coordinates 35.33m; meet the trajectory requirements.

[0057] 8. Using geological logging data to predict the stratigraphic sequence and corresponding vertical depth, the formation enters the Chang 3 Member of Yanchang Formation. According to the analysis of cuttings logging, the vertical depth of target A is 1476.86m, the east-west coordinates are 171.94m, and the north-south coordinates The 596.43m remains unchanged, the same as the original design. Geological logging includes lithology logging, gas logging, drilling time logging, and fluorescence logging.

[0058] 9. According to the vertical depth of target point A, set the end point vertical depth of the three-dimensional well section as a virtual target point of 1370m. The inclination angle is 64.5±1.5° and the inclination azimuth angle is 0±1.5°. The tool face angle calculation formula:

[0059] ω = arctan φ e - φ s ln tan α e 2 - ln tan α s 2

[0060] Among them, ω is the tool face angle in radians; α s Is the inclination angle of the starting point of the three-dimensional well section, in radians; α e Is the inclination angle of the end point of the three-dimensional well section, in radians; φ s Is the azimuth of the inclination of the starting point of the three-dimensional well section, in radians; φ e It is the azimuth of the inclination of the end point of the three-dimensional well section, in radians. The inclination angle and the inclination azimuth angle of the start and end points of the three-dimensional well section in steps 7 and 9 are brought into the above calculation formula, and the tool face angle is 300.5°.

[0061] 10. According to mud logging stratum prediction and real-time logging data, according to the length of a drill pipe of the pipe string, set the inclination angle α of the point to be drilled in the 3D well i+1 Determined by the following equation:

[0062] ( α i + 1 - α i ) - l i D i + 1 - D i ( sin α i + 1 - sin α i ) = 0

[0063] The formula for calculating the position is: φ i + 1 = arctan ΔE i + 1 ΔN i + 1 ;

[0064] Where α i Is the inclination angle of the known measuring point, the unit is radians; α i+1 Is the inclination angle of the next drilling point, in radians; D i Is the vertical depth of the known measuring point, in radians; D i+1 Is the vertical depth of the next drilling point, in meters; l i Is the length of a drill pipe of the pipe string, in meters; △E i+1 Is the east-west coordinates of the next point to be drilled, in meters; △N i+1 It is the north-south coordinates of the next drilling point, in meters.

[0065] 11. Drill to the end point of the 3D well section, and measure the depth of the well at 1512.03m, the inclination angle of 64.51° and the inclination angle of 1.2° to meet the trajectory control requirements. According to cuttings logging and gas logging, the Chang 7 member has been entered, and the vertical depth of target A is corrected to 1477m. It needs a steady slope of 150m, and then enter the target A at a slope rate of 4.8-5.1°/30m. The actual vertical depth of the A target is 1476.72m, which meets the requirement of 1m longitudinal offset of the A target.

[0066] 12. According to the horizontal section as Chang 8 reservoir, the lithology is lithologic sandstone, and the inclination angle is 90.57°, the drilling tool assembly is determined to be Φ215.9mm PDC bit + 1.25° screw + 213mm centralizer + non-magnetic drill collar + directional joint +Φ127mm drill pipe+Φ127mm heavy drill pipe+Φ127mm drill pipe string. The horizontal section is actually drilled 750m. The drilling is completed to meet the design requirements, and the target rate in geology is 100%. See the actual drilling trajectory figure 1 , figure 2 with image 3 Shown.

[0067] From figure 1 , figure 2 with image 3 It can be seen that the actual drilling trajectory is very consistent with the design, indicating that the trajectory control accuracy is very high and the control effect is very good. The current daily oil production of this well is 8.3 tons/day, which is more than twice that of the adjacent well, and good geological effects have been achieved.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified. Or equivalent replacements, any modifications or partial replacements that do not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

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Classification and recommendation of technical efficacy words

High precision
Low cost

Method and apparatus for patterned plasma-mediated laser trephination of the lens capsule and three dimensional phaco-segmentation

ActiveUS20060195076A1High precisionEasy to disassembleLaser surgeryDiagnosticsPhysics3D ultrasound

Owner:AMO DEVMENT

Three-dimensional (3D) horizontal well borehole track controlling method

A control method and wellbore trajectory technology, applied in wellbore/well components, directional drilling, earth-moving drilling, etc., can solve the problem of high cost and achieve the effect of low cost, easy construction and easy operation

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

Example Embodiment

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Description & Claims & Application Information

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