Rotary steerable drilling system test supporting system - Formation simulation system

Abstract

A formation simulation system for a test supporting system of a rotary steerable drilling system, mainly composed of a cement target, a retaining seat, and a base; several cement targets are installed on the base, several wellheads are pre-buried on the cement target at the front, the cement target at the tail is restricted by the retaining seat installed on the base, and the base is installed on the ground to form the formation simulation system of the test supporting system of the rotary steerable drilling system. The present invention adopts prefabricated monomer molding and integral installation, which is convenient for disassembly. Once prefabricated, the simulated formation drilling tests of four wells can be completed, effectively improving the test efficiency of rotary steerable tools and having a certain promoting effect on the industry to accelerate the research and development process of rotary steerable tools.

Description

Technical Field

[0001] The present invention relates to the field of oil and gas drilling and production, and in particular to providing an indoor ground simulation test device for rotary guide products in the oil and gas drilling and production industries. Background Art

[0002] With the need for domestic oilfields to develop special oil wells such as ultra-deep wells, high-difficulty directional wells, horizontal wells, extended reach wells and horizontal branch wells in special oil reservoirs, the research on rotary steerable drilling technology is becoming increasingly heated. In order to research and develop rotary steerable technology products, reliable ground simulation test equipment is one of the necessary conditions. Ground simulation tests are carried out before going into the well to verify and test the functional principle, guiding force and guiding effect of the rotary steerable tool, and to assess the reliability of the tool product.

[0003] Oilfield companies at home and abroad have established formation simulation systems by mixing cement and gravel in a certain proportion to simulate on-site oil drilling conditions. The formation simulation systems of various existing rotary steerable test devices are all cast in one piece on the ground. Once formed, they cannot be moved. Not only do they occupy a large amount of laboratory space, but they can only perform one simulated drilling test at a time. After each simulated drilling test, the well needs to be refilled with cement and gravel mortar. The test can only be repeated after the cement and gravel mortar solidifies and reaches a certain strength. This long waiting time seriously restricts the efficiency of rotary steerable tool testing and is a bottleneck hindering the development of rotary steerable tools. Summary of the Invention

[0004] The present invention provides a formation simulation system for a rotary steering drilling system test supporting system, which can effectively improve the test efficiency of the rotary steering tool.

[0005] The technical solution adopted in the present invention is:

[0006] A formation simulation system for a rotary steerable drilling system test supporting system is mainly composed of cement targets, a stopper, and a base; a plurality of cement targets are installed on the base, a plurality of wellheads are pre-buried on the cement targets at the front, and the cement targets at the rear are restricted by the stopper installed on the base, and the base is installed on the ground to form a formation simulation system for a rotary steerable drilling system test supporting system.

[0007] The cement targets are provided with frames. Frame-shaped soft rubber seals are used between contact surfaces of adjacent cement targets. U-shaped pressing plates clamp the frame edges of adjacent cement targets and seal and connect n cement targets into one body through bolts and nuts.

[0008] A first pre-buried wellhead, a second pre-buried wellhead, a third pre-buried wellhead and a fourth pre-buried wellhead are arranged on the front end surface of the cement target.

[0009] The present invention adopts prefabricated monomer molding, with overall installation and convenient disassembly. Once prefabrication is completed, simulated formation drilling tests for four simulated wells can be carried out, effectively improving the test efficiency of rotary steerable tools, and playing a certain role in promoting the research and development process of rotary steerable tools in the industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of the present invention;

[0011] Figure 2 is Figure 1 a sectional view of the one with a support;

[0012] Figure 3 is Figure 1 a sectional view of the one without a support;

[0013] Figure 4 is Figure 1 a partial enlarged view of the upper and two side pressure sealing structures of adjacent two cement targets;

[0014] Figure 5 is Figure 1 a partial enlarged view of the lower pressure sealing structure of adjacent cement targets;

[0015] Figure 6 is Figure 1 an external view of the connection of adjacent cement targets. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the objectives, technical solutions and advantages of the present invention clearer and more definite, the following further describes the present invention in detail with reference to the accompanying drawings and by way of examples.

[0017] The working process can be simplified as follows:

[0018] The present invention adopts prefabricated monomer molding, with overall installation and convenient disassembly. Once prefabrication is completed, simulated formation drilling tests for four simulated wells can be carried out, effectively improving the test efficiency of rotary steerable tools. The engineering process is simplified as follows:

[0019] Manufacturing process of the cement target: First, a frame 8 is prefabricated, and then the cement target 4 is formed by mixing cement and crushed stones in a certain proportion and pouring them. According to the needs of simulating the drilling formation, n cement targets 4 are prefabricated at one time. At the end of one of the cement targets 4, four wellbores, namely the first pre-buried wellhead 3-1, the second pre-buried wellhead 3-2, the third pre-buried wellhead 3-3, and the fourth pre-buried wellhead 3-4, are pre-buried in advance. During installation, the base 14 is fixed on the ground through anchor bolts 1, nuts 2, and pressure plates 6. First, the cement target 4 with four pre-buried wellbores is placed on the base 14 from the lifting hook 7 through a lifting tool. Then, the second cement target is lifted into place in a similar manner. A frame-shaped soft rubber 11 is arranged at the joint between the first cement target and the second cement target for sealing. After the U-shaped pressure plate 12 clamps the edges of the adjacent cement target frames, several cement targets are hermetically connected together through bolts 9 and nuts 10. For details, see Figure 4 the partial connection diagram. After the installation is completed, finally, the retaining seat 5 is connected to the base 14 to prevent the drilling pressure borne by the cement target from being overcome during drilling. At this time, the formation simulation system installation is completed. The mating flange 15 is configured on the cement target 4, and the simulation drilling test can be carried out by connecting the flange of the wellbore 16 through bolts and nuts. At this time, the fourth pre-buried wellhead 3-4 is connected. See Figure 2 , first drill the fourth pre-buried wellhead 3-4 well. After the simulation drilling formation simulation system test is completed, if it is necessary to conduct the simulation drilling formation simulation system test for the second well, first remove the connection bolts between the mating flange 15 and the wellbore 16. Without changing the position of the wellbore, the cement target can be moved to the right as a whole, so that the center of the third pre-buried wellhead 3-3 is aligned with the center of the wellbore 16. Then, the mating flange placed on the cement target 4 is connected to the flange of the wellbore 16 through bolts and nuts, and the simulation drilling test of the third pre-buried wellhead 3-3 can be carried out after the connection. If it is necessary to conduct the test for the third well, that is, drill the second pre-buried wellhead 3-2 well, the base 14 can be removed, the cement targets can be reinstalled in sequence and connected in turn, and fixed to the ground through anchor bolts 1, nuts 2, and pressure plates 6. After the retaining seat 5 is installed in place and the center of the second pre-buried wellhead 3-2 is aligned with the center of the wellbore, the mating flange 15 and the wellbore 16 are connected to carry out the simulation drilling test; if it is necessary to drill the first pre-buried wellhead 3-1 well, similar to the installation method of the third pre-buried wellhead 3-3, the cement target is moved to the right. After the center of the first pre-buried wellhead 3-1 is aligned with the center of the wellbore, it is connected and fixed, and the simulation drilling formation simulation system test is carried out. The formation simulation system of the rotary drilling system test supporting system disclosed by the present invention is detachable, easy and flexible to install, occupies a small space, can simulate the drilling of four wells by one-time prefabrication, greatly shortens the test cycle, and provides a test guarantee for the research and development of rotary steering tools.

Claims

1. A formation simulation system for a test supporting system of a rotary steerable drilling system, characterized in that It consists of a cement target (4), a retaining seat (5), and a base (14); several cement targets (4) are installed on the base (14). A number of wellheads are pre-buried in the cement target (4) at the front. The cement target (4) at the tail is restricted by the retaining seat (5) installed on the base (14). The base (14) is installed on the ground to form a formation simulation system for the test supporting system of the rotary steerable drilling system; the cement target (4) is provided with a frame (8), and the contact surfaces between adjacent cement targets (4) are sealed with a frame-shaped soft rubber (11). The U-shaped pressing plate (12) clamps the frame edges of adjacent cement targets (4) and connects several cement targets (4) into a sealed whole through bolts (9) and nuts (10); on the end face of the cement target (4) at the front, there are a first pre-buried wellhead (3-1), a second pre-buried wellhead (3-2), a third pre-buried wellhead (3-3), and a fourth pre-buried wellhead (3-4); a lifting hook (7) is arranged at the top of the cement target (4); the base (14) is welded by steel sections and is used to support the cement target (4).

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