RU2002945C1 - Method for surveying directional wells - Google Patents

Abstract

Usage: the study of oil directional wells. Chain: improving reliability and simplifying the implementation of the method. SUMMARY OF THE INVENTION: After lowering the device 1 on the cable 2, a rigid elongated element 6 is installed on the last one with a length equal to or greater than the total length of the curved and investigated horizontal sections. A load 8 is installed at the upper end of the elongated element 6. Then, due to the gravity of the load moving along the straight section of the wellbore, the rigid elongated element 6 is pushed with the device 1. 1 a

Description

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The invention relates to the oil and gas industry and can be used to study horizontal directional oil wells.

There is a known method for researching directional wells, including descent into a well on a cable of an instrument and a transport device with electric or hydraulic drive, delivery to a horizontal section of the device using a transport device, conducting research on the device in the process of moving it along the studied section.

The main disadvantage of this research method is the low reliability and complexity of implementation.

Low reliability is due to the complexity of the transport device and the creation of an emergency in case of failure of the transport device after it reaches the horizontal section of the well, because taking into account the curvature of the well and the design features of the transport device, remove it from the well by pulling through the line Using it with ground equipment is almost impossible. For these reasons, this method of researching wells with horizontal sections has not found practical application in the industry.

A known method of researching directional wells, including descent into a well on a cable of a downhole tool located at the lower end of a rigid drill pipe string, disconnecting the tool from the end of the drill pipe, conducting research on the cable by lifting the drill pipe string and moving the tool using cable.

The main disadvantage of this measurement method is a lot of work.

bone, as in order to conduct research in the well, it is necessary, in addition to lowering the device on the cable, to lower the drill pipe string and disconnect them during the research and re-build when the test is repeated. As a prototype, a method for researching directional wells, including descent into a well on a cable of a downhole tool, has been installed;

at the lower end of the elongated element in the form of a semi-rigid pipe in which the cable is laid and which are unwound from the drum, straighten and linearly move, before conducting studies on an inclined section of a semi-rigid

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the pipe is filled from the pumping system under pressure with fluid through rotating hydraulic and electric manifolds and is pushed, due to its own weight, together with the device into a curved and horizontal section of the wellbore, followed by studies during pulling of the elongated element and the device along the studied interval.

The main disadvantage of this method is the low reliability and high complexity of the implementation of the method.

Low reliability is due to the need to pull a sealed semi-rigid elongated element to the entire depth of the well and through its curved and horizontal sections.

At the same time, conflicting requirements are imposed on the elongated element, such as semi-rigidity (elasticity), which makes it possible to wind it onto the drum, stiffness when filling with liquid, which ensures its bending stability when pushing it through curvilinear and horizontal sections, wear resistance when pulling elongated element along the entire wellbore (for a length of several kilometers), cannot provide the method with high reliability due to the difficulty of maintaining tightness and the flexible member in the process of lowering, and research and its resistance to bending. The complexity of the implementation lies in the need to use, in addition to an elongated element, which provides the requirements for maintaining tightness, bending stability and semi-rigidity, also interconnected rotating hydraulic and electric manifolds and a pump system.

It complicates the implementation of the method, and also reduces its reliability, the placement inside the semi-rigid elongated element of the electric cable, which is simultaneously a load-bearing element of the device for implementing the method. Its placement inside the elongated element promotes intensive abrasion of the latter about the curved section of the well, especially when moving the device along the horizontal section during the lifting of the cable with the elongated element up.

The aim of the invention is to increase reliability and simplify the implementation of the method.

This is achieved due to the fact that in the method of researching directional wells, including lowering a deep device into the well by cable, delivering to the horizontal section of the device at the lower end of the elongated element in the form of a pipe inside which the cable is passed, conducting research in the process of pulling the device with an elongated element along the investigated section of the well, in contrast to the prototype, a rigid elongated element is installed with a length equal to or greater than the total length of the curved and studied mountain on the upper sections of the wellbore, above the device, after lowering the latter on the cable into the well, a load is placed on the upper end of the rigid elongated element, and due to the gravity of the load moving along the rectilinear section of the wellbore, the rigid elongated element with the device is pushed along the curvilinear and horizontal sections wellbore.

New features of the invention are

installation of a rigid elongated element with a length equal to or greater than the total length of the curvilinear and studied horizontal sections of the wellbore above the device after the latter is lowered by cable into the well;

Installation on the upper end of an elongated load element:

pushing the elongated element with the device along the curved and horizontal sections of the wellbore due to the gravity of the load moving along the straight section of the wellbore.

There is no need for the proposed method of using a semi-rigid, sealed elongated element with a length equal to the length of the cable, for filling the elongated element from the pump system under pressure with liquid through rotating hydraulic and electric manifolds, the use of a rigid elongated element of limited length and a load above it, which allows the elongated to be pushed element with a device, increases reliability and simplifies the implementation of the method.

When studying well-known technical solutions in this technical field, the features that distinguish the proposed solution from the prototype were not identified and therefore they provide the proposed technical solution that meets the criterion with significant differences. At the same time, comparison of the proposed technical solution with the prototype allows us to establish compliance of the features with the criterion of novelty.

The method is implemented by the following sequence of operations.

The device is lowered into the well on the cable. A rigid, enlarged element 5 is installed above the device with a length equal to or greater than the total length of the curved and studied horizontal sections. A load is installed on the upper end of the rigid elongated element. Due to the gravity 0 of the load moving within the linear section of the wellbore, a rigid elongated element is pushed, and the device along the curved, and then along the horizontal sections of the barrel

5 wells. Moving the device with a rigid elongated element with a cable in the opposite direction along the test one, the section of the well is investigated.

The drawing shows a device for

0 implementation of the proposed method.

The device comprises a downhole tool 1 on cable 2. lowered into a directional well, the trunk of which contains a linear 3, curved 4 and

5 horizontal 5 sections. Above the device on the cable there is a rigid elongated element b made in the form of interconnected light pipes with longitudinal slots 7 and clamps (not shown)

0 restricting the exit of the cable from the pipes after their installation. At the upper end of the rigid elongated element 6, a load 8 is installed with an axial hole for the cable, a longitudinal slot 9 and a latch. On the surface5, cable 2 is connected via a roller 10 to a winch of a research station (not shown).

In order to conduct studies, for example, the cementing quality of the casing string in the horizontal section 5 of the wellbore, the device 1 on cable 2 is lowered into the well to the length of one pipe of the elongated element 6. Install the first protruding above the borehole part of the cable 2

5 the pipe of the elongated element 6 and after fixing, preventing the exit of the cable through the slot of the pipe, lower the first pipe into the well and install it above the device. Then set to serving

0 part of the cable 2 the second pipe and connect it to the first with the corresponding fixation relative to the cable 2. After that, partially lower the second pipe together with the device into the well. In the indicated sequence, the entire elongated element 6 is installed, after which a load 8 is mounted on its upper end with its corresponding fixation. Using the station winch, the device 1 is lowered to the bottom of the well. In this case, under the influence of the load 8, the elongated element 6 with the device 1 at the lower end is pushed through the curved 4 and horizontal 5 sections of the well.

Moving the device 1 with the winch in the opposite direction, the necessary studies are carried out.

It is possible to install on the cable 2 of the elongated element 6 and the load 8, made without slots. In some other research methods, sealing of the cable entry may occur after the tool, elongated member, and load are lowered into the well.

When exploring wells excited by the tubing method, the descent of the device, elongated element and load can be carried out through tubing. Moreover, in

Claims (1)

The claims METHOD FOR RESEARCHING TILT DIRECTED WELLS, including launching the device into the well on a cable, installing an elongated element above the device, delivering the device with the elongated element to the bottom of the well and conducting research in the process of pulling the device with the elongated element along the studied section of the well in the opposite direction, characterized in that that the elongated element is made in 0 during the study, the load moves along the linear portion of the well below the lower end of the tubing. The technical advantage of this method compared to the prototype is increased reliability due to the uncriticality of the method to abrasion of the elongated element and loss of tightness, as well as ease of implementation, the result of which is a reduction in equipment costs and, accordingly, on ongoing research. (56) Copyright certificate of the USSR Mg 1465549, cl. E 21 B 47/00, 1989. French application No. 2562153, cl. E 21 B 47/12, 1985, French Application Mg 2596875, class E 21 B 47/12, 1988. in the form of light pipes rigidly interconnected and with a length equal to or greater than the total length of the curvilinear and studied horizontal sections of the wellbore, the load is installed at the upper end of the elongated element and the device with the elongated element is delivered to the bottom of the well by pushing them along the curvilinear first and then along horizontal sections due to the movement of the load under the influence of its gravity along a rectilinear section of the wellbore.