CN104594881A - Method for determining relative special positions of adjacent well parallel sections - Google Patents

Abstract

The invention provides a method for determining relative special positions of adjacent well parallel sections. The method comprises the steps of obtaining well condition information of a drilled well and a drilling well; processing the well condition information, and obtaining a wellhead coordinate of the drilled well in a drilling well wellhead coordinate system; obtaining data collected by a downhole exploring tube in a downhole electromagnetic detecting instrument; inclinometry calculation is performed on the drilling well and the drilled well, drawing an adjacent well distance sscannogram, determining a range of relative direction of horizontal sections of two horizontal wells; obtaining a relative position of the downhole exploring tube and a magnetic sub according to the data collected by the downhole exploring tube and the range of the relative direction of the horizontal sections of the two horizontal wells; determining relative spatial positions of the drilling well and the drilled well in the drilling well wellhead coordinate system according to the wellhead coordinate of the drilled well in the drilling well wellhead coordinate system and the relative position of the downhole exploring tube and the magnetic sub. In this way, the relative spatial positions of the adjacent well parallel sections can be determined, and the problems that in the prior art, the distance between the drilling well and the drilled well can not determined when axial magnetic induction intensity signals collected by the downhole exploring tube reach saturation are solved.

Description

Determine the method for offset well parallel-segment relative tertiary location

Technical field

The present invention relates to subterranean resource drilling field of engineering technology, particularly relate to a kind of method determining offset well parallel-segment relative tertiary location.

Background technology

China's remaining oil and natural gas reserves mostly belong to low-grade or difficulty employs resource, and its development difficulty is increasing, also have cbm development problem, all propose more and more higher active demand to complex structural well technology.In order to improve recovery ratio, the complex structural wells such as dual horizontal well, connected well, U-shaped well, multifunctional combination well and cluster well are just widelyd popularize in China.These modern complex structural well drilling and production technologies all require accurately detecting offset well distance, to make adjacent two mouthfuls of wells be communicated with or creep into by design pitch, only rely on the hole trajectory control effect that traditional well track error theory and measurement while drilling instrument are difficult to reach desirable.

Prior art discloses a kind of electromagnetic system for detecting distance between adjacent wells while drilling and a kind of downhole electromagnetic survey meter.The hardware of electromagnetic system for detecting distance between adjacent wells while drilling, primarily of magnetic short section and downhole electromagnetic survey meter composition, can be surveyed offset well distance with probing, accurately realize complex structural well steerable drilling control objectives.Magnetic short section is arranged in the non magnetic drill collar of two ends with the API standard shape of the mouth as one speaks by the multiple permanent magnets walking crosswise arrangement and forms, and immediately following after positive drilling bit, together rotates produce the signal source that alternating magnetic field is electromagnetic system for detecting distance between adjacent wells while drilling with drilling tool.Downhole electromagnetic survey meter is primarily of underground probe and ground system two parts composition, and its Main Function is the magnetic signal detecting the magnetic short section be cascaded with drill bit, and by the magnetic signal data that detect by cable transmission to ground system.

Prior art also discloses a kind of for SAGD (Steam AssistedGravity Drainage, be called for short SAGD) computational methods of dual horizontal well electromagnetic guiding distance measurement while drilling, but when drilling well is nearer for positive drilling well distance, the axial magnetic signal utilizing electromagnetic system for detecting distance between adjacent wells while drilling downhole electromagnetic survey meter to detect is saturated, can not apply the method and determine the distance of positive drilling well to drilling well.

Given this, when the axial magnetic induction signal of the underground probe collection in the inspection of downhole electromagnetic survey meter reaches capacity, how to determine the relative tertiary location of offset well parallel-segment, and then determine that positive drilling well becomes the current technical issues that need to address to the distance of drilling well.

Summary of the invention

For defect of the prior art, the invention provides a kind of method determining offset well parallel-segment relative tertiary location, the radial magnetic signal that the method utilizes electromagnetic system for detecting distance between adjacent wells while drilling downhole electromagnetic survey meter to detect, the relative tertiary location of offset well parallel-segment can be determined, when the axial magnetic induction signal solving underground probe collection in prior art reaches capacity, can not determine the problem of positive drilling well to the distance of drilling well.

First aspect, the invention provides a kind of method determining offset well parallel-segment relative tertiary location, comprising:

Obtain the hole condition information of drilling well and positive drilling well;

Described hole condition information is processed, obtains with positive drilling well-head position as the mouth coordinate with reference to drilling well described in the positive drilling well-head coordinate system set up;

Obtain the data that the underground probe in downhole electromagnetic survey meter gathers;

Clinometers calculation is carried out to described positive drilling well and drilling well, and draws out described positive drilling well and the offset well range sweep figure of drilling well, determine the scope of the horizontal segment relative bearing of dual horizontal well;

The scope of the horizontal segment relative bearing of the data gathered according to described underground probe and described dual horizontal well, obtains the relative position of described underground probe and magnetic short section;

According to the mouth coordinate of drilling well and the relative position of described underground probe and magnetic short section in described positive drilling well-head coordinate system, determine described positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system.

Alternatively, described hole condition information comprises: the casing programme of well track metrical information, the drilling well of drilling well and positive drilling well and the brill dish level of the mouth coordinate of positive drilling well, drilling well and positive drilling well and EGL and drilling well; And

The data of described underground probe collection comprise: the three axle magnetic induction density B that in positive drilling well, magnetic short section produces _x, B _yand B _z, well-drilling borehole flash Hs and unit vector between included angle A _hx.

Alternatively, described described hole condition information to be processed, to obtain with positive drilling well-head position as the mouth coordinate with reference to drilling well described in the positive drilling well-head coordinate system set up, comprising:

According to described hole condition information, with positive drilling well-head position for positive drilling well-head coordinate system is set up in reference;

According to brill dish level and the EGL of described positive drilling well and drilling well, obtain positive drilling well brill dish level than how much low drilling well brill dish level is high how many or;

Determine that described well track metrical information is relative to brill dish level or EGL;

According to the mouth coordinate of described positive drilling well with drilling well, obtain drilling well-head and align the side-play amount of drilling well-head mutually;

The true vertical depth of the underground probe in the downhole electromagnetic survey meter in described positive drilling well-head coordinate system, northern coordinate, eastern coordinate data add or deduct described side-play amount.

Alternatively, the data that the underground probe in described acquisition downhole electromagnetic survey meter gathers, comprising:

According to the positive drilling well estimated to the distance D of drilling well, with drilling rod or crawl device, the underground probe in downhole electromagnetic survey meter is lowered into drilling well correct position, in described underground probe to described positive drilling well, the axial distance of drill bit is D;

Described drill bit continues the distance of creeping into 2D, obtains the data that underground probe gathers described in this segment distance.

Alternatively, the scope of the horizontal segment relative bearing of the described data that gather according to described underground probe and described dual horizontal well, obtains the relative position of described underground probe and magnetic short section, comprising:

According to the data that described underground probe gathers, calculate magnetic short section to the radial spacing r of underground probe and well-drilling borehole flash Hs and unit vector between included angle A _hr;

According to the scope of the horizontal segment relative bearing of described dual horizontal well, determine included angle A _hrspan;

According to radial spacing r, the included angle A of described magnetic short section to underground probe _hrand included angle A _hrspan, obtain the relative position of described underground probe and magnetic short section.

Alternatively, described magnetic short section to the radial spacing r of underground probe is:

$r={\mathrm{MD}}_{t_2}-{\mathrm{MD}}_{t_1},$

Wherein, for at t ₂well depth residing for moment magnetic short section, representative is at t ₁well depth residing for moment magnetic short section.

Alternatively, the described flash Hs of well-drilling borehole and unit vector between included angle A _hrfor:

$A_{\mathrm{hr}}=A_{\mathrm{hs}}+\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right),$

Or,

$A_{\mathrm{hr}}=\mathrm{\π}+A_{\mathrm{hs}}-\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right),$

Wherein, | B _x|, | B _y| be the magnetic induction intensity B of the magnetic short section generation that sensor with alternating magnetic field x, y-axis in underground probe detect _x, B _ythe amplitude of waveform, with positive drilling well-head position for reference to set up positive drilling well-head coordinate system in, unit vector direction be respectively the direction of three axle sensor with alternating magnetic field x, y-axis in underground probe, be also the direction of other three-axis sensor x, y simultaneously, unit vector direction be the radial direction of positive drilling well to drilling well.

Alternatively, after determining described positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system, also comprise:

According to the result of calculation of determined described positive drilling well with the relative tertiary location of drilling well in positive drilling well-head coordinate system, adjustment drill bit continues to creep into the next position;

Return the step of the data that the underground probe in described acquisition downhole electromagnetic survey meter gathers, until drilling well completes.

As shown from the above technical solution, the method determining offset well parallel-segment relative tertiary location of the present invention, by obtaining the hole condition information of drilling well and positive drilling well, processed, to obtain in positive drilling well-head coordinate system drilling well-head coordinate, obtain the data that the underground probe in downhole electromagnetic survey meter gathers, align drilling well and carry out clinometers calculation with drilling well, and draw out offset well range sweep figure, determine the scope of the horizontal segment relative bearing of dual horizontal well, the scope of the data gathered according to underground probe and the horizontal segment relative bearing of dual horizontal well, obtain the relative position of underground probe and magnetic short section, according to the mouth coordinate of drilling well and the relative position of underground probe and magnetic short section in positive drilling well-head coordinate system, determine positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system, thus, offset well parallel-segment relative tertiary location can be determined, the problem of positive drilling well to drilling well distance is can not determine when the axial magnetic induction signal solving underground probe collection in prior art reaches capacity.

Accompanying drawing explanation

Fig. 1 is the operating principle schematic diagram of electromagnetic system for detecting distance between adjacent wells while drilling in cluster well that the present invention uses;

The schematic flow sheet of the method for the determination offset well parallel-segment relative tertiary location that Fig. 2 provides for one embodiment of the invention;

The positive drilling well that Fig. 3 provides for one embodiment of the invention and drilling well relative position schematic diagram;

The positive drilling well that Fig. 4 provides for one embodiment of the invention and the computation model of drilling well relative bearing schematic diagram;

The schematic diagram of the three axle magnetic induction intensity curves that the underground probe in the downhole electromagnetic survey meter that Fig. 5 provides for one embodiment of the invention receives within a period of time;

The schematic diagram of the radial magnetic induction intensity that Fig. 6 provides for one embodiment of the invention curve over time;

The schematic diagram of the coenvelope line of the radial magnetic induction intensity curve that Fig. 7 provides for one embodiment of the invention;

Reference numeral:

1, positive drilling well; 2, drilling well; 3, magnetic short section; 4, the underground probe in downhole electromagnetic survey meter; 5, drill bit; 6, drilling rod; 7, cable; 8, boring tower; 9, cable car; 31, the magnetic line of force.

Detailed description of the invention

For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, clear, complete description is carried out to the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Fig. 2 shows the schematic flow sheet of the method for the determination offset well parallel-segment relative tertiary location that one embodiment of the invention provides, as shown in Figure 2, the method utilizes the electromagnetic system for detecting distance between adjacent wells while drilling shown in Fig. 1, Fig. 1 shows the operating principle schematic diagram of electromagnetic system for detecting distance between adjacent wells while drilling in cluster well that the present invention uses, the method of the invention is the core methed that this system is applied to cluster well active anti-collision, and the method for the determination offset well parallel-segment relative tertiary location of the present embodiment is as described below.

201, the hole condition information of drilling well and positive drilling well is obtained.

Wherein, described hole condition information comprises: the casing programme of well track metrical information, the drilling well of drilling well and positive drilling well and the brill dish level KB of the mouth coordinate of positive drilling well, drilling well and positive drilling well and EGL GL and drilling well

202, described hole condition information is processed, obtain with positive drilling well-head position as the mouth coordinate with reference to drilling well described in the positive drilling well-head coordinate system set up.

In a particular application, this step 202 can comprise not shown step 202a-202e:

202a, according to described hole condition information, with positive drilling well-head position for reference to setting up positive drilling well-head coordinate system.

202b, according to the brill dish level of described positive drilling well and drilling well and EGL, obtain positive drilling well brill dish level than how much low drilling well brill dish level is high how many or.

202c, determine that described well track metrical information is relative to brill dish level or EGL.

202d, according to the mouth coordinate of described positive drilling well with drilling well, obtain drilling well-head and align the side-play amount of drilling well-head mutually.

The true vertical depth (true vertical depth is called for short TVD) of the underground probe in 202e, downhole electromagnetic survey meter in described positive drilling well-head coordinate system, northern coordinate N, eastern coordinate E data add or deduct described side-play amount.

203, the data that the underground probe in downhole electromagnetic survey meter gathers are obtained.

Wherein, the data of the underground probe collection in described downhole electromagnetic survey meter comprise: the three axle magnetic induction density B that in positive drilling well, magnetic short section produces _x, B _yand B _z, well-drilling borehole flash Hs and unit vector between included angle A _hx.

It should be noted that B _x, B _yand B _zcan be recorded by three axle sensor with alternating magnetic field in the underground probe in downhole electromagnetic survey meter, included angle A _hxcan be recorded by the 3-axis acceleration sensor in the underground probe in downhole electromagnetic survey meter.

In a particular application, this step 203 can comprise not shown step 203a and 203b:

203a, according to estimate positive drilling well to the distance D of drilling well, with drilling rod or crawl device, the underground probe in downhole electromagnetic survey meter is lowered into drilling well correct position, in described underground probe to described positive drilling well, the axial distance of drill bit is D.

203b, described drill bit continue the distance of creeping into 2D, obtain the data that underground probe gathers described in this segment distance.

204, clinometers calculation is carried out to described positive drilling well and drilling well, and draw out described positive drilling well and the offset well range sweep figure of drilling well, determine the scope of the horizontal segment relative bearing of dual horizontal well.

Will be understood that, clinometers calculation method in this step uses clinometers calculation method of the prior art, the present invention is not limited, for example, can balance tangent method, average angle method, minimum-curvature method, cylinder helix method, correction average angle method, string footwork, Natural Parameter Method, Keeping device angular curve method etc.

The scope of the data 205, gathered according to described underground probe and the horizontal segment relative bearing of described dual horizontal well, obtains the relative position of described underground probe and magnetic short section.

In a particular application, this step 205 can comprise not shown step 205a-205c:

205a, the data gathered according to described underground probe, calculate magnetic short section to the radial spacing r of underground probe and well-drilling borehole flash Hs and unit vector between included angle A _hr.

205b, scope according to the horizontal segment relative bearing of described dual horizontal well, determine included angle A _hrspan.

205c, according to radial spacing r, the included angle A of described magnetic short section to underground probe _hrand included angle A _hrspan, obtain the relative position of described underground probe and magnetic short section.

Wherein, described magnetic short section to the radial spacing r of underground probe is:

$r={\mathrm{MD}}_{t_2}-{\mathrm{MD}}_{t_1},$

Wherein, for at t ₂well depth residing for moment magnetic short section, representative is at t ₁well depth residing for moment magnetic short section;

The described flash Hs of well-drilling borehole and unit vector between included angle A _hrfor:

$A_{\mathrm{hr}}=A_{\mathrm{hs}}+\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right),$

Or $A_{\mathrm{hr}}=\mathrm{\π}+A_{\mathrm{hs}}-\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right),$

Wherein, | B _x|, | B _y| be the magnetic induction intensity B of the magnetic short section generation that sensor with alternating magnetic field x, y-axis in underground probe detect _x, B _ythe amplitude of waveform, with positive drilling well-head position for reference to set up positive drilling well-head coordinate system in, unit vector direction be respectively the direction of three axle sensor with alternating magnetic field x, y-axis in underground probe, be also the direction of other three-axis sensor x, y simultaneously, unit vector direction be the radial direction of positive drilling well to drilling well.

206, according to the mouth coordinate of drilling well and the relative position of described underground probe and magnetic short section in described positive drilling well-head coordinate system, described positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system is determined.

Will be understood that, according to the determined described positive drilling well of the present embodiment and the relative tertiary location of drilling well in positive drilling well-head coordinate system, can determine that positive drilling well is to drilling well distance.

In the present embodiment, be the scope of the horizontal segment relative bearing according to described dual horizontal well, determine included angle A _hrspan, and then finally can determine included angle A _hrsize, by r and included angle A _hrjust can determine the relative position of described underground probe and magnetic short section, and then determine described positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system, for the adjustment of next step well track of directed drilling engineer provides scientific basis.

The method of the determination offset well parallel-segment relative tertiary location of the present embodiment, by obtaining the hole condition information of drilling well and positive drilling well, processed, to be obtained in positive drilling well-head coordinate system drilling well-head coordinate, obtained the data that the underground probe in downhole electromagnetic survey meter gathers, align drilling well and carry out clinometers calculation with drilling well, and draw out offset well range sweep figure, determine the scope of the horizontal segment relative bearing of dual horizontal well, the scope of the data gathered according to underground probe and the horizontal segment relative bearing of dual horizontal well, obtain the relative position of underground probe and magnetic short section, according to the mouth coordinate of drilling well and the relative position of described underground probe and magnetic short section in described positive drilling well-head coordinate system, determine described positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system, offset well parallel-segment relative tertiary location can be determined, the problem of positive drilling well to drilling well distance is can not determine when the axial magnetic induction signal solving underground probe collection in prior art reaches capacity.

In a particular application, after above-mentioned steps 206, also this method can comprise not shown step 207 and 208:

207, according to the result of calculation of determined described positive drilling well with the relative tertiary location of drilling well in positive drilling well-head coordinate system, adjustment drill bit continues to creep into the next position.

208, step 203 is returned, until drilling well completes.

In a particular application, " according to the data that described underground probe gathers, magnetic short section is calculated to the radial spacing r of underground probe and well-drilling borehole flash Hs and unit vector what perform above-mentioned steps 205a between included angle A _hr" process in; can refer to Fig. 3 and Fig. 4; Fig. 3 shows positive drilling well that the present embodiment provides and drilling well relative position schematic diagram; as shown in Figure 3; wherein, qrw rectangular coordinate system is the former heart with magnetic short section center, with positive drilling well bearing of trend for w axle; with positive drilling well to the radial direction of drilling well for r axle, q axle is orthogonal to w axle and r axle simultaneously; Fig. 4 shows the positive drilling well and the computation model of drilling well relative bearing schematic diagram that the present embodiment provides, as shown in Figure 4, wherein, with positive drilling well-head position for reference in the positive drilling well-head coordinate system set up, unit vector with direction represent the direction of three axle sensor with alternating magnetic field x, y and z axes respectively, also represent the direction of other three-axis sensor x, y and z axes, unit vector simultaneously direction represent magnetic short section equivalence magnetic moment direction at a time, Hs represents the well flash of underground probe place drilling well, A _mrrepresentation unit vector and unit vector between angle, A _hrrepresent well-drilling borehole flash Hs and unit vector between angle, A _hxrepresent well-drilling borehole flash Hs and unit vector between angle, A _xrrepresentation unit vector with between angle;

When positive drilling well is with drilling well parallel well section is when nearer, the axial sensor in the underground probe in downhole electromagnetic survey meter reaches capacity, and in coordinate system shown in Fig. 2, can be obtained by the far field magnetic field regularity of distribution around rotary magnetic pipe nipple:

$B_r=\frac{m}{4\mathrm{\π}}\frac{({2r}^2-z^2)\cos \left(A_{\mathrm{hr}}\right)}{{(r^2+z^2)}^{5/2}}---\left(1\right)$

$B_q=\frac{m}{4\mathrm{\π}}\frac{\sin \left(A_{\mathrm{hr}}\right)}{{(r^2+z^2)}^{3/2}}---\left(2\right)$

$B_z=\frac{m}{4\mathrm{\π}}\frac{3\mathrm{rz}\cos \left(A_{\mathrm{hr}}\right)}{{(r^2+z^2)}^{5/2}}---\left(3\right)$

Radial magnetic induction density B can be obtained by (3) formula and (4) _r:

$B_R^2=B_r^2+B_q^2={\left(\frac{m}{4\mathrm{\π}}\right)}^2\frac{1}{{(r^2+z^2)}^3}(\frac{{({2r}^2-z^2)}^2}{{(r^2+z^2)}^2}{\cos }^2\left(A_{\mathrm{hr}}\right)+{\sin }^2\left(A_{\mathrm{hr}}\right))---\left(4\right)$

$B_R=\frac{m}{4\mathrm{\π}}\frac{1}{{(r^2+z^2)}^{3/2}}{(\frac{{3r}^2(r^2-{2z}^2)}{{(r^2+z^2)}^2}{\cos }^2\left(A_{\mathrm{hr}}\right)+1)}^{1/2}---\left(5\right)$

Due to B _zcan be recorded by the z-axis sensor with alternating magnetic field in the underground probe in downhole electromagnetic survey meter, and

$\sqrt{B_r^2+B_q^2+B_z^2}=\sqrt{B_x^2+B_y^2+B_z^2}---\left(6\right)$

So $B_R=\sqrt{B_x^2+B_y^2}---\left(7\right)$

The underground probe of magnetic short section in downhole electromagnetic survey meter, the three axle magnetic induction density B recorded by three axle sensor with alternating magnetic field in the underground probe in downhole electromagnetic survey meter _x, B _yand B _zcurve as shown in Figure 5 over time, can obtain B _rcurve as shown in Figure 6 over time;

As shown in Figure 6, magnetic short section often rotates a circle, B _rthere is a maximum value B _rup, obtain B by (5) formula _rcan be expressed as:

$B_{\mathrm{Rup}}=\frac{m}{4\mathrm{\π}}{(\frac{1}{{(r^2+z^2)}^3}+\frac{{3r}^2(r^2-{2z}^2)}{{(r^2+z^2)}^5})}^{1/2}---\left(8\right)$

B _rupcurve as shown in Figure 7 over time.By (8) Shi Ke get:

$\frac{{\∂B}_{\mathrm{Rup}}}{\∂z}=-\frac{m}{4\mathrm{\π}}{\left(6z(\frac{1}{{(r^2+z^2)}^4}+2\frac{r^2}{{(r^2+z^2)}^5}+5\frac{r^2(r^2-{2z}^2)}{{(r^2+z^2)}^6})\right)}^{1/2}---\left(9\right)$

(9) formula is made to equal zero, known as z=0, B _rupreach maximum value, and

$B_{\mathrm{Rup}\max }=\frac{m}{2{\mathrm{\πr}}^3}---\left(10\right)$

As z=r/2,

$B_{\mathrm{Rup}}=\frac{7m}{{16\mathrm{\πr}}^3}{\left(\frac{4}{5}\right)}^{5/2}---\left(11\right)$

By (10) formula and (11) Shi Ke get:

$\frac{B_{\mathrm{Rup}\max }}{B_{\mathrm{Rup}}}=\frac{8}{7}{\left(\frac{5}{4}\right)}^{5/2}\≈1.9965---\left(12\right)$

And as shown in Figure 6, B _rupat t ₁and t ₂moment reaches therefore, positive drilling well can be tried to achieve by following formula with the radial spacing r of drilling well parallel-segment:

r＝MD _t2-MD _t1(13)

Wherein, for at t ₂well depth residing for moment magnetic short section, representative is at t ₁well depth residing for moment magnetic short section;

At t ₁moment or t ₂moment, by (1) formula ~ (3) Shi Ke get:

$B_{\mathrm{rt}1}={\left(\frac{4}{5}\right)}^{5/2}\frac{7m}{{16\mathrm{\πr}}^3}\cos \left(A_{\mathrm{hr}}\right)---\left(14\right)$

$B_{\mathrm{qt}1}={\left(\frac{4}{5}\right)}^{3/2}\frac{m}{{4\mathrm{\πr}}^3}\sin \left(A_{\mathrm{hr}}\right)---\left(15\right)$

$B_{\mathrm{zt}1}={\left(\frac{4}{5}\right)}^{5/1}\frac{3m}{{8\mathrm{\πr}}^3}\cos \left(A_{\mathrm{hr}}\right)---\left(16\right)$

As shown in Figure 4, the magnetic induction intensity component that three axle sensor with alternating magnetic field x in the underground probe in downhole electromagnetic survey meter, y-axis detect is:

B _x＝B _rcos(A _xr)-B _qsin(A _xr) (17)

B _y＝B _rsin(A _xr)+B _qcos(A _xr) (18)

(14) ~ (16) formula is substituted into (17) formula and (18) Shi Ke get:

$B_x={\left(\frac{4}{5}\right)}^{3/2}\frac{m}{{4\mathrm{\πr}}^3}\sqrt{\frac{49}{25}{\cos }^2\left(A_{\mathrm{xr}}\right)+{\sin }^2\left(A_{\mathrm{xr}}\right)}\cos (A_{\mathrm{mr}}-P_x)---\left(19\right)$

$B_y={\left(\frac{4}{5}\right)}^{3/2}\frac{m}{{4\mathrm{\πr}}^3}\sqrt{\frac{49}{25}{\sin }^2\left(A_{\mathrm{xr}}\right)+{\cos }^2\left(A_{\mathrm{xr}}\right)}\cos (A_{\mathrm{mr}}-P_y)---\left(20\right)$

Wherein, $\cos \left(P_x\right)=\frac{\frac{7}{5}\cos \left(A_{\mathrm{xr}}\right)}{\sqrt{\frac{49}{25}{\cos }^2\left(A_{\mathrm{xr}}\right)+{\sin }^2\left(A_{\mathrm{xr}}\right)}}---\left(21\right)$

$\sin \left(P_x\right)=\frac{-\sin \left(A_{\mathrm{xr}}\right)}{\sqrt{\frac{49}{25}{\cos }^2\left(A_{\mathrm{xr}}\right)+{\sin }^2\left(A_{\mathrm{xr}}\right)}}---\left(22\right)$

$\cos \left(P_y\right)=\frac{\frac{7}{5}\sin \left(A_{\mathrm{xr}}\right)}{\sqrt{\frac{49}{25}{\sin }^2\left(A_{\mathrm{xr}}\right)+{\cos }^2\left(A_{\mathrm{xr}}\right)}}---\left(23\right)$

$\sin \left(P_y\right)=\frac{\cos \left(A_{\mathrm{xr}}\right)}{\sqrt{\frac{49}{25}{\sin }^2\left(A_{\mathrm{xr}}\right)+{\cos }^2\left(A_{\mathrm{xr}}\right)}}---\left(24\right)$

By (19) formula and (20) Shi Ke get:

$\cos \left({2A}_{\mathrm{xr}}\right)=\frac{37}{12}\frac{{\left|B_x\right|}^2-{\left|B_y\right|}^2}{{\left|B_x\right|}^2+{\left|B_y\right|}^2}---\left(25\right)$

Wherein, | B _x|, | B _y| be the magnetic induction intensity B of the magnetic short section generation that sensor with alternating magnetic field x, y-axis in underground probe detect _x, B _ythe amplitude of waveform;

From (25) formula, well-drilling borehole flash Hs and unit vector between included angle A _hrcan be tried to achieve by following formula:

$\mathrm{Ahr}=\mathrm{Ahx}+\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right),$

Or $\mathrm{Ahr}=\mathrm{\π}+\mathrm{Ahx}-\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right).$

The method of the determination offset well parallel-segment relative tertiary location of the present embodiment, the relative tertiary location of offset well parallel-segment can be determined, when the axial magnetic induction signal solving underground probe collection in prior art reaches capacity, can not determine the problem of positive drilling well to the distance of drilling well.

One of ordinary skill in the art will appreciate that: all or part of step realizing above-mentioned each embodiment of the method can have been come by the hardware that programmed instruction is relevant.Aforesaid program can be stored in a computer read/write memory medium.This program, when performing, performs the step comprising above-mentioned each embodiment of the method; And aforesaid storage medium comprises: ROM, RAM, magnetic disc or CD etc. various can be program code stored medium.

Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of the claims in the present invention.

Claims (8)

1. determine a method for offset well parallel-segment relative tertiary location, it is characterized in that, comprising:

Obtain the hole condition information of drilling well and positive drilling well;

Described hole condition information is processed, obtains with positive drilling well-head position as the mouth coordinate with reference to drilling well described in the positive drilling well-head coordinate system set up;

Obtain the data that the underground probe in downhole electromagnetic survey meter gathers;

Clinometers calculation is carried out to described positive drilling well and drilling well, and draws out described positive drilling well and the offset well range sweep figure of drilling well, determine the scope of the horizontal segment relative bearing of dual horizontal well;

The scope of the horizontal segment relative bearing of the data gathered according to described underground probe and described dual horizontal well, obtains the relative position of described underground probe and magnetic short section;

According to the mouth coordinate of drilling well and the relative position of described underground probe and magnetic short section in described positive drilling well-head coordinate system, determine described positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system.

2. method according to claim 1, is characterized in that,

Described hole condition information comprises: the casing programme of well track metrical information, the drilling well of drilling well and positive drilling well and the brill dish level of the mouth coordinate of positive drilling well, drilling well and positive drilling well and EGL and drilling well; And

The data of described underground probe collection comprise: the three axle magnetic induction density B that in positive drilling well, magnetic short section produces _x, B _yand B _z, well-drilling borehole flash Hs and unit vector between included angle A _hx.

3. method according to claim 2, is characterized in that, describedly described hole condition information is processed, and to obtain with positive drilling well-head position as the mouth coordinate with reference to drilling well described in the positive drilling well-head coordinate system set up, comprising:

According to described hole condition information, with positive drilling well-head position for positive drilling well-head coordinate system is set up in reference;

According to brill dish level and the EGL of described positive drilling well and drilling well, obtain positive drilling well brill dish level than how much low drilling well brill dish level is high how many or;

Determine that described well track metrical information is relative to brill dish level or EGL;

According to the mouth coordinate of described positive drilling well with drilling well, obtain drilling well-head and align the side-play amount of drilling well-head mutually;

The true vertical depth of the underground probe in the downhole electromagnetic survey meter in described positive drilling well-head coordinate system, northern coordinate, eastern coordinate data add or deduct described side-play amount.

4. method according to claim 2, is characterized in that, the data that the underground probe in described acquisition downhole electromagnetic survey meter gathers, and comprising:

According to the positive drilling well estimated to the distance D of drilling well, with drilling rod or crawl device, the underground probe in downhole electromagnetic survey meter is lowered into drilling well correct position, in described underground probe to described positive drilling well, the axial distance of drill bit is D;

Described drill bit continues the distance of creeping into 2D, obtains the data that underground probe gathers described in this segment distance.

5. method according to claim 2, is characterized in that, the scope of the horizontal segment relative bearing of the described data that gather according to described underground probe and described dual horizontal well, obtains the relative position of described underground probe and magnetic short section, comprising:

According to the data that described underground probe gathers, calculate magnetic short section to the radial spacing r of underground probe and well-drilling borehole flash Hs and unit vector between included angle A _hr;

According to the scope of the horizontal segment relative bearing of described dual horizontal well, determine included angle A _hrspan;

According to radial spacing r, the included angle A of described magnetic short section to underground probe _hrand included angle A _hrspan, obtain the relative position of described underground probe and magnetic short section.

6. method according to claim 5, is characterized in that, described magnetic short section to the radial spacing r of underground probe is:

$r={\mathrm{MD}}_{t_2}-{\mathrm{MD}}_{t_1},$

Wherein, for at t ₂well depth residing for moment magnetic short section, representative is at t ₁well depth residing for moment magnetic short section.

7. method according to claim 5, is characterized in that, the described flash Hs of well-drilling borehole and unit vector between included angle A _hrfor:

$A_{\mathrm{hr}}=A_{\mathrm{hx}}+\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right),$

Or,

$A_{\mathrm{hr}}=\mathrm{\π}+A_{\mathrm{hx}}-\frac{1}{2}\arccos \left(\frac{37({\left|B_x\right|}^2-{\left|B_y\right|}^2)}{12({\left|B_x\right|}^2+{\left|B_y\right|}^2)}\right),$

Wherein, | B _x|, | B _y| be the magnetic induction intensity B of the magnetic short section generation that sensor with alternating magnetic field x, y-axis in underground probe detect _x, B _ythe amplitude of waveform, with positive drilling well-head position for reference to set up positive drilling well-head coordinate system in, unit vector direction be respectively the direction of three axle sensor with alternating magnetic field x, y-axis in underground probe, be also the direction of other three-axis sensor x, y simultaneously, unit vector direction be the radial direction of positive drilling well to drilling well.

8. the method according to any one of claim 1-7, is characterized in that, after determining described positive drilling well and the relative tertiary location of drilling well in positive drilling well-head coordinate system, also comprises:

According to the result of calculation of determined described positive drilling well with the relative tertiary location of drilling well in positive drilling well-head coordinate system, adjustment drill bit continues to creep into the next position;

Return the step of the data that the underground probe in described acquisition downhole electromagnetic survey meter gathers, until drilling well completes.