# Patent

## Title
Control devices for controlling the position of a marine seismic streamer

## Abstract

A control device or “bird” for controlling the position of a marine seismic streamer is provided with an elongate, partly flexible body which is designed to be electrically and mechanically connected in series with a streamer. In its preferred form, the bird has two opposed wings which are independently controllable in order to control the streamer's lateral position as well as its depth.

## Background
This application is a continuation of Ser. No. 10/704,182, filed Nov. 7, 2003 (now U.S. Pat. No. 7,822,552), from which Applicant claims priority under 35 U.S.C. §120. Ser. No. 10/704,182 was a divisional of Ser. No. 09/893,234, filed Jun. 26, 2001 (now U.S. Pat. No. 6,671,223), which was a continuation of Ser. No. 09/284,030, filed Apr. 6, 1999 (abandoned), which was a 35 U.S.C. §371 national stage filing from Patent Cooperation Treaty application number PCT/GB97/03507, filed Dec. 19, 1997, which in turn claimed priority from Great Britain patent application number 9626442.9, filed Dec. 20, 1996, from which Applicant has claimed foreign priority under 35 U.S.C. §119.


BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to control devices for controlling the position of a marine seismic streamer.
2. Description of the Prior Art
A marine seismic streamer is an elongate cable-like structure, typically up to several thousand meters long, which contains arrays of hydrophones and associated electronic equipment along its length, and which is used in marine seismic surveying. In order to perform a 3D marine seismic survey, a plurality of such streamers are towed at about 5 knots behind a seismic survey vessel, which also tows one or more seismic sources, typically air guns. Acoustic signals produced by the seismic sources are directed down through the water into the earth beneath, where they are reflected from the various strata. The reflected signals are received by the hydrophones, and then digitised and processed to build up a representation of the earth strata in the area being surveyed.
The streamers are typically towed at a constant depth of about ten meters, in order to facilitate the removal of undesired “ghost” reflections from the surface of the water. To keep the streamers at this constant depth, control devices known as “birds”, attached to each streamer at intervals of 200 to 300 meters, are used.
Current designs of birds are battery-powered, and comprise a relatively heavy body which is suspended beneath the streamer, and which has a pair of laterally projecting wings (hence the name “bird”), one on each side. The combination of streamer and birds is arranged to be neutrally buoyant, and the angle of attack of both wings is adjusted in unison from time to time to control the depth of the streamer.
Birds in accordance with these current designs suffer from a number of disadvantages. Because they are battery-powered, the batteries can run out before the survey is completed, necessitating either retrieval of the streamer for battery replacement, or deployment of a work boat to replace the battery in the water. The former operation is very time consuming, while the latter can be hazardous. Further, because the birds hang beneath the streamer, they produce considerable noise as they are towed through the water, which noise interferes with the reflected signals detected by the hydrophones in the streamers. The hanging of the birds from the streamers also means that the birds need to be detached each time the streamer is retrieved and re-attached each time it is re-deployed, which is again rather time consuming.
During the seismic survey, the streamers are intended to remain straight, parallel to each other and equally spaced. However, after deploying the streamers, it is typically necessary for the vessel to cruise in a straight line for at least three streamer lengths before the streamer distribution approximates to this ideal arrangement and survey can begin. This increases the time taken to carry out the survey, and therefore increases the cost of the survey. But because of sea currents, the streamers frequently fail to accurately follow the path of the seismic survey vessel, sometimes deviating from this path by an angle, known as the feathering angle, of up to 10°. This can adversely affect the coverage of the survey, frequently requiring that certain parts of the survey be repeated. In really bad circumstances, the streamers can actually become entangled, which though rare, causes great damage and considerable financial loss. Current designs of birds can do nothing to alleviate any of these lateral streamer positioning problems.
It is therefore an object of the present invention to provide novel streamer control devices which alleviate at least some of the disadvantages of the current designs, and/or which possess more functionality than the current designs.
SUMMARY OF THE INVENTION
According to the present invention, there is provided a control device for controlling the position of a marine seismic streamer, the device comprising a body mechanically connected in series between two adjacent sections of the streamer, sensor means in the body for determining its angular position in a plane perpendicular to the longitudinal axis of the streamer, two opposed control surfaces projecting outwardly from the body, each control surface being rotatable about an axis which in use extends transversely of the streamer, and control means responsive to control signals and the sensor means for independently adjusting the respective angular positions of said two control surfaces so as to control the lateral position of the streamer as well as its depth.
In a preferred embodiment of the invention, for use with a multi-section streamer which includes an electric power line, the control means is at least partly electrical and arranged in use to receive electric power from said electric power line.
When the streamer also includes a control line, the control means is preferably arranged in use to receive control signals from the control line.
The control means preferably includes at least one electrical motor, and may also include means for sensing the respective angular positions of the two control surfaces.
Conveniently, said two control surfaces rotate about a common axis.
Advantageously, each of the two control surfaces comprises a respective wing-like member which is swept back with respect to the direction of tow of the streamer.
Preferably, said control surfaces are releasably secured to the body, which may be adapted to be non-rotatably coupled to the streamer.



BRIEF DESCRIPTION OF DRAWINGS
The invention will now be described, by way of example only, with reference to the accompanying drawings, of which:
FIG. 1 is a somewhat schematic representation of a preferred embodiment of a streamer control device in accordance with the present invention;
FIG. 2 is a simple schematic of a control system forming part of the streamer control device of FIG. 1; and
FIGS. 3 to 5 illustrate the operation of the streamer control device of FIG. 1.



The streamer control device, or “bird”, of FIG. 1 is indicated generally at 10, and comprises an elongate streamlined body 12 adapted to be mechanically and electrically connected in series in a multi-section marine seismic streamer 14 of the kind which is towed by a seismic survey vessel and which is used in, in conjunction with a seismic source also towed by the vessel, to conduct seismic surveys, as briefly described hereinbefore. To permit such connection, each end of the body 12 is provided with a respective mechanical and electrical connector 16, 18, these connectors being complementary to, and designed to interconnect with, streamer and connectors 20, 22 respectively which are normally used to join together adjacent sections 14a and 14b of the streamer 14.
The bird 10 is provided with two opposed control surfaces, or wings, 24, typically moulded from a fibre-reinforced plastics material, which project horizontally outwardly from the body 12 and which are independently rotatable about a common axis extending substantially perpendicularly through the longitudinal axis of the body. Rotation of the wings 24 is effected under the control of a control system 26 sealingly housed within the body 12. The wings 24 are generally ogival (ie rounded) and swept back with respect to the direction of tow of the streamer 14 (which direction is indicated by the arrow 28), in order to reduce the possibility of debris becoming hooked on them. To facilitate their rapid removal and reattachment, the wings 24 are secured to body 12 by a quick-release attachment 30.
As mentioned hereinbefore, the streamer 14 includes hydrophones distributed along its length; it also includes control and conversion circuitry for converting the outputs of the hydrophones into digital data signals, longitudinally extending control and data lines for conducting control and data signals to and from the control and conversion circuitry, and electrical power supply lines for supplying electrical power from the vessel to the circuitry. All these lines are coupled together from the streamer section 14a to the streamer section 14b via respective corresponding lines 32 which extend through the body 12 of the bird 10 between the connectors 16, 18. Additionally, the control system 26 is connected to receive control signals and electric power from respective ones of the lines 32.
The greater part of the length of the body 12 of the bird 10 is flexible, the only rigid parts being the connectors 20, 22, and a short central section which houses the control system 26 and from which the wings 24 project. This central section, which is made of aluminium or titanium and has holes passing longitudinally therethrough for the passage of Kevlar or other stress members which bear the longitudinal loads on the body 12, is kept as short as possible, typically around 40 cm, so that once the wings 24 have been detached from the body 12, the streamer 14 can be wound onto and unwound from the large drum used for storing the streamer, with the body 12 still connected in the streamer. The quick-release attachment 30 permits the removal and attachment of the wings 24 to be at least partly automated as the streamer 14 is reeled in and out during the survey.
The reason for providing the elongate flexible parts of the body 12 is to provide enough length for the inclusion of one or more hydrophones or hydrophone groups, should this be necessary to preserve a desired uniform hydrophone spacing along the length of streamer 14. If no hydrophones need to be included, the flexible parts of the body 12 can be omitted altogether, along with the aforementioned stress members.
The control system 26 is schematically illustrated in FIG. 2, and comprises a microprocessor-based control circuit 34 having respective inputs 35 to 39 to receive control signals representative of desired depth, actual depth, desired lateral position, actual lateral position and roll angle of the bird 10 (ie the angular position of the body 12 in a plane perpendicular to the longitudinal axis of the streamer 14). The desired depth signal can be either a fixed signal corresponding to the aforementioned 10 meters, or an adjustable signal, while the actual depth signal is typically produced by a depth sensor 40 mounted in or on the bird 10. The lateral position signals are typically derived from a position determining system of the kind described in our U.S. Pat. No. 4,992,990 or our International Patent Application No WO 9621163. The roll angle signal is produced by an inclinometer 42 mounted within the bird 10.
The control circuit 34 has two control outputs 44, 46, connected to control respective electrical stepper motors 48, 50, each of which is drivingly connected to a respective one of the wings 24. The stepper motors 48, 50 have respective outputs at which they produce signals representative of the their respective current angular positions (and therefore of the current angular positions of the wings 24), which outputs are connected to respective control inputs 52, 54 of the control circuit 34.
In operation, the control circuit 34 receives between its inputs 35 and 36 a signal indicative of the difference between the actual and desired depths of the bird 10, and receives between its inputs 37 and 38 a signal indicative of the difference between the actual and desired lateral positions of the bird 10. These two difference signals are used by the control circuit 34 to calculate the roll angle of the bird 10 and the respective angular positions of the wings 24 which together will produce the necessary combination of vertical force (upwardly or downwardly) and lateral force (left or right) required to move the bird 10 to the desired depth and lateral position. The control circuit 34 then adjusts each of the wings 24 independently by means of the stepper motors 48, 50 so as to start to achieve the calculated bird roll angle and wing angular positions.
FIGS. 3 to 5 illustrate the operation of the bird 10 in the case where the streamer 14 is slightly heavy (slightly negative buoyancy), and the bird 10 thus needs to produce lift to maintain the streamer at the desired depth. This lift is produced by the flow of the water over the wings 24 of the bird 10, resulting from the 5 knot towing speed of the streamer 14 through the water, and can be changed by changing the angle of attack of the wings with respect to the flow. The magnitude of the lift required for the situation envisaged by FIG. 3 is indicated by the length of the arrows 60.
If the streamer 14 now needs to be moved laterally to the right (as viewed in FIGS. 3 to 5), the angular position of the left wing 24 of the bird 10 is first adjusted to increase its lift, while the angular position of the right wing is adjusted to decrease its lift, as represented by the length of the arrows 64 in FIG. 4, thus causing the bird 10 to roll clockwise from the position shown in FIG. 3 to the position shown in FIG. 4. This clockwise roll continues until the bird 10 reaches the steady state condition shown in FIG. 5, where it can be seen that the vertical component of the lift produced by the wings 24, indicated by the arrows 66, is equal to the lift represented by the arrows 60 of FIG. 3 required to maintain the streamer 14 at the desired depth, while the much larger horizontal component, represented by the arrows 68, moves the streamer 14 to the right.
While adjusting the angular positions of the wings 24 of the bird 10, the control circuit 34 continuously receives signals representative of the actual angular positions of the wings from the stepper motors 48, 50, as well as a signal representative of the actual roll angle of the bird from the inclinometer 42, to enable it to determine when the calculated wing angular positions and bird roll angle have been reached. And as the aforementioned difference signals at the inputs 35 to 38 of the control circuit 34 reduce, the control circuit repeatedly recalculates the progressively changing values of the roll angle of the bird 10 and angular positions of the wings 24 required for the bird and streamer reach the desired depth and lateral position, until the bird and streamer actually reach the desired depth and lateral position.
The body of the bird 10 does not rotate with respect to the streamer 14, and thus twists the streamer as its rolls. The streamer 14 resists this twisting motion, so acting as a kind of torsion spring which tends to return the bird 10 to its normal position (ie with the wings 24 extending horizontally). However, this spring returning action, though beneficial is not essential, and the bird 10 can if desired be designed to rotate to a certain extent with respect to the axis of the streamer 14.
It will be appreciated that the bird 10 has several important advantages with respect to prior art birds. Its in-line connection in the streamer 14 not only reduces the noise it generates as the streamer is towed through the water, but also enables it to derive power and control signals via the streamer and so obiviates the need for batteries (although they may still be provided if desired for back-up purposes). But most importantly, it enables the horizontal or lateral position of the streamer 14 to be controlled, and not just its depth.
Another significant advantage of the bird 10 is that by virtue of the shortness of the stiff parts of the respective body 12 and easily detachable wings 24, it does not need to be removed from the streamer 14 during winding and unwinding. This saves a considerable amount of time when carrying out the seismic survey.
Many modifications can be made to the bird 10. For example, the wings 24 can be staggered slightly along the length of the body 12, in order to provide slightly more room for their respective drive trains. Additionally, the electric motors 48, 50 can be replaced by hydraulic actuators.

## Claims

1. A device comprising:
a housing connectable in line between two sections of a marine seismic streamer;
first and second control surfaces that project laterally outward from the housing and that are independently rotatable with respect to each other so that, in a first configuration, an angle of inclination of a lateral surface of each of the first and second control surfaces is different, and, in a second configuration, an angle of inclination of a lateral surface of each of the first and second control surfaces is configured such that a same lift force is applied on each of the control surfaces; and
a control system in the housing responsive to control signals that selectively adjust respective angles of inclination of the lateral surfaces of the first and second control surfaces to have the first configuration, which causes the control surfaces to jointly operate to produce a rolling force on the housing, and the second configuration, which causes the control surfaces to jointly operate to produce a force to adjust lateral position of the streamer without producing a rolling force on the housing.

2. The device of claim 1, wherein the housing is constructed of material selected from aluminum, titanium, and combinations thereof.

3. The device of claim 1, further comprising:
one or more sensors in the housing for determining the angular position of the housing in a plane approximately perpendicular to the longitudinal axis of the streamer,
wherein the control system is responsive to at least one of the sensors.

4. The device of claim 1, wherein the two control surfaces rotate about a common axis.

5. The device of claim 1, wherein the two control surfaces comprise two opposed wings.

6. The device of claim 1, wherein the housing is adapted to be nonrotatably coupled to the streamer.

7. A device, comprising:
a bird connectable to a marine seismic streamer configured to flow through water;
the bird including first and second wings projecting outward from a housing, each of the first and second wings including a wing surface that extends from a leading edge of the respective first and second wings to a trailing edge of the respective first and second wings, the first and second wings being independently rotatable to adjust an angle of attack of the wing surfaces of the first and second wings with respect to a direction of travel of the housing during use; and
a control system that controls rotation of the first and second wings to have a first configuration where the wing surfaces of the first and second wings respectively have different angles of attack of with respect to a direction of travel of the housing that cause the first and second wings to jointly operate to produce a rolling force on the bird, and a second configuration where a same lift force is applied to the wing surfaces of the first and second wings respectively to cause the first and second wings to jointly operate to produce a force on the streamer to control lateral position of the streamer without producing a rolling force on the bird.

8. The device of claim 7, wherein the wings are releasabley secured to the bird.

9. The device of claim 7, the bird comprising a body having a rigid in line housing and a flexible inline portion.

10. The device of claim 9, wherein the body has a diameter approximately the same as a diameter of the streamer.

11. The device of claim 7 comprising a control system including sensors for sensing angular position of each of the two wings.

12. The device of claim 11, wherein the control system further comprises:
a control circuit in communication with one or more sensors for sensing depth, lateral position, and roll angle of the bird.

13. The device of claim 7, wherein the pair of wings are adapted to rotate about a common axis.

14. A method, comprising:
connecting a bird to a marine seismic streamer in series therewith between two sections of the marine seismic streamer; and
individually controlling angular position of first and second control surfaces of the bird to adjust lift of the first and second control surfaces so as to have
a first configuration where the first and second control surfaces jointly operate to produce a rolling force on the bird by
adjusting an angular position of the first control surface to increase lift of the first control surface, and
adjusting an angular position of the second control surface to decrease lift of the first control surface, and

a second configuration where a same lift force is applied to the first and second control surfaces such that a force to control lateral position of the marine seismic streamer is provided without producing a rolling force on the bird.

15. The method of claim 14, comprising:
determining position of the bird;
comparing the determined position of the bird to a desired position of the bird; and
rotating the control surfaces according to the comparison.

16. The method of claim 15, wherein the control surfaces comprise two opposed wings.

17. The method of claim 16, wherein the two control surfaces rotate about a common axis.

18. The method of claim 14, further comprising:
measuring the roll angle of the bird using an inclinometer; and
using the measured roll angle in controlling the bird.

19. A streamer control device, comprising:
a body adapted to be mechanically and electrically connected in series between two sections of a multi-section marine seismic streamer;
first and second control surfaces that project laterally outward from the body and that are independently rotatable with respect to each other so that, in a first configuration, an angle of inclination of a lateral surface of each of the first and second control surfaces is different, and, in a second configuration, an angle of inclination of a lateral surface of each of the first and second control surfaces is configured such that a same lift force is applied on each of the surfaces;
an inclinometer mounted within the device to provide a roll angle signal indicating the roll angle of the device;
a control circuit adapted to selectively adjust respective angles of inclination of the lateral surfaces of the first and second control surfaces based on the roll angle signal to individually adjust lift of each control surface so as to provide the first configuration, which causes the control surfaces to jointly operate to produce a rolling force on the body, and the second configuration, which causes the control surfaces to jointly operate to produce a force to control lateral position of the marine seismic streamer without producing a rolling force on the body.

20. The streamer control device of claim 19, wherein the body further comprises:
a flexible, greater part of the body; and
a rigid, lesser part of the body.

21. The streamer of claim 20, wherein the flexible, greater part of the body houses at least one seismic sensor.

22. The streamer of claim 20, wherein the rigid, lesser part of the body houses a control system.

23. The streamer of claim 19, wherein the body houses at least one seismic sensor.

24. The streamer of claim 19, wherein the body houses said control circuit.

25. The streamer of claim 19, wherein the control surfaces are defined by vanes detachable during retrieval without disassembling the streamer.

26. The streamer of claim 19, wherein the control surfaces control the position of the device in both depth and lateral position.