Oil field horizontal well production fluid profile test system and test method

Abstract

The invention discloses an oil field horizontal well production fluid profile testing system which comprises a production casing pipe, a testing mechanism, an oil pipe, a continuous oil pipe and a check valve. The oil pipe and the testing mechanism are arranged in the production sleeve; the testing mechanism is arranged on the outer wall of the oil pipe; the check valve is connected with the oil pipe and arranged on the lower portion of the straight well section of the oil pipe. The continuous oil pipe is arranged in the oil pipe and located on the upper portion of the check valve. The optical fiber test cable is brought into a target layer through the oil pipe, the liquid production profile test under the production state of the oil production well is completed through continuous oil pipe nitrogen injection circulation gas lift, positioning is accurate, the test efficiency is high, the procedure is simple, and the site construction operation cost is effectively reduced. The method can be applied to judgment of the horizontal well with the middle and high water content, effective water control and oil stabilization measures are taken, and an important basis is provided for understanding and evaluating the development effect and guiding adjustment of development policies.

Description

Technical Field

[0001] The invention relates to the technical field of conventional horizontal well production fluid profile testing, and in particular to an oilfield horizontal well production fluid profile testing system and a testing method. Background Art

[0002] As the scale of horizontal well development continues to expand, while improving oil field recovery, it also faces the problem of water breakthrough in oil wells as the development time is extended. After water breakthrough in oil wells, the oil well production capacity drops rapidly. It is urgent to carry out horizontal well production profile testing and read downhole temperature parameters directly on the ground to provide a basis for optimizing development plans and improving recovery, so as to implement water plugging in a targeted manner.

[0003] At present, the conventional production profile testing technology of horizontal wells is difficult to test in various production sections. The main problems are that the crawler of conventional testing technology encounters obstruction and gets stuck, and the success rate of the test is low, with a success rate of only nearly 30%; the instrument response is poor under small flow and fluid stratification conditions; the conventional production profile test cannot read data directly, and the test time is long, and the operation risk is relatively high when raising and lowering the test string; the mechanical testing technology uses the packer to get stuck, which does not belong to the test under the same pressure system; the optical fiber testing method that uses a wellbore pump to discharge fluid is not applicable to wells with high gas-liquid ratio, etc.

[0004] Therefore, it is an urgent technical problem to provide a production profile test string that can grasp the profile changes of the temperature in the wellbore over time, has accurate testing, short cycle, and reduces operation risks. Summary of the invention

[0005] The present invention aims to provide a production fluid profile testing system and method for oilfield horizontal wells, which can grasp the profile changes of the temperature in the wellbore over time, and has accurate testing, short cycle, and reduces the operation risk of the production fluid profile testing string.

[0006] To achieve the above object, the present invention provides a production fluid profile testing system for a horizontal well in an oil field, comprising: a production casing, a testing mechanism, an oil pipe, a coiled oil pipe, and a check valve;

[0007] The oil pipe and the testing mechanism are arranged inside the production casing; the testing mechanism is arranged on the outer wall of the oil pipe; the check valve is connected to the oil pipe and is arranged at the lower part of the vertical well section of the oil pipe; the continuous oil pipe is arranged inside the oil pipe and is located above the check valve.

[0008] Optionally, the testing mechanism is a fiber optic test cable.

[0009] Optionally, the length of the optical fiber test cable is the same as the length of the oil pipe.

[0010] Optionally, the system further includes: a signal receiving processor; wherein the signal receiving processor is disposed on the ground and is connected to the testing mechanism via an electrical signal.

[0011] The present invention also provides a testing method, which comprises:

[0012] Obtaining treated production casing;

[0013] Fixing the test mechanism to the outer wall of the oil pipe to obtain a composite oil pipe;

[0014] The composite tubing is lowered to the horizontal section of the horizontal well to be tested, and the coiled tubing is inserted into the tubing and positioned above the check valve;

[0015] Temperature information is obtained by injecting nitrogen gas into the coiled tubing from the surface;

[0016] Wherein, the check valve is connected to the oil pipe and is arranged at the lower part of the vertical well section of the oil pipe.

[0017] Optionally, obtain treated production casing, including:

[0018] The horizontal well to be tested is dredged, sand-washed and casing scraped to obtain the processed production casing.

[0019] Optionally, the testing mechanism is a fiber optic test cable.

[0020] Optionally, the length of the optical fiber test cable is the same as the length of the oil pipe.

[0021] Optionally, obtaining temperature information includes: the fluid in the wellbore flows through a testing mechanism, the testing mechanism obtains the wellbore temperature information and transmits the temperature information in the form of an electrical signal to a signal receiving processor.

[0022] Technical effects and advantages of the present invention:

[0023] The present invention provides a production fluid profile testing system for a horizontal well in an oil field, comprising: a production casing, a testing mechanism, an oil pipe, a continuous oil pipe, and a check valve; the oil pipe and the testing mechanism are arranged inside the production casing; the testing mechanism is arranged on the outer wall of the oil pipe; the check valve is connected to the oil pipe and is arranged at the lower part of the vertical well section of the oil pipe; the continuous oil pipe is arranged inside the oil pipe and is located on the upper part of the check valve.

[0024] The present invention uses oil pipes to bring the optical fiber test cable into the target layer, and completes the production profile test of the oil well under the production state through nitrogen injection and circulation gas lift in the continuous oil pipe. It has accurate positioning, high test efficiency, simple procedures, and effectively reduces the cost of on-site construction operations. Moreover, the present invention can be applied to the judgment of medium and high water-content horizontal wells, and then take effective water control and oil stabilization measures, providing an important basis for understanding and evaluating development effects and guiding the adjustment of development policies.

[0025] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a diagram of the production profile test system for horizontal wells in oil fields;

[0027] Figure numerals: 1 - production casing; 2 - optical fiber test cable; 3 - oil pipe; 4 - continuous oil pipe; 5 - check valve. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings provided by the present invention, and the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0030] At present, the conventional production profile test technology of horizontal wells is difficult to test in each production section, and has the following main shortcomings: 1. Conventional testing technology has the problem of crawler encountering obstruction and jamming, which makes the test success rate low, with a success rate of only nearly 30%. 2. The instrument response is poor under small flow and fluid stratification conditions. For example, the turbine flowmeter has a large starting displacement (starting flow rate 0.01m / s, 5 1 / 2″ casing corresponding flow rate is 10.6m3 / d); 3. Conventional production profile testing cannot read data directly, and the test time is long (average 15 days / well), and the operation risk is relatively high when lifting and lowering the test string; 4. Mechanical testing technology uses a packer that is stuck, which does not belong to the test under the same pressure system.

[0031] In order to solve the above-mentioned shortcomings, the present invention discloses a system for testing the production profile of a horizontal well in an oil field. Figure 1 A detailed introduction to the oilfield horizontal well production profile testing system:

[0032] An oilfield horizontal well production fluid profile testing system comprises: a production casing (1), a testing mechanism (2), an oil pipe (3), a coiled oil pipe (4), and a check valve (5);

[0033] The oil pipe (3) and the testing mechanism (2) are arranged inside the production casing (1); the testing mechanism (2) is arranged on the outer wall of the oil pipe (3); the check valve (5) is connected to the oil pipe (3) and is arranged at the lower part of the vertical well section of the oil pipe (3); the continuous oil pipe (4) is arranged inside the oil pipe (3) and is located above the check valve (5).

[0034] Specifically, the testing mechanism (2) is an optical fiber testing cable.

[0035] Specifically, the length of the optical fiber test cable is the same as the length of the oil pipe (3).

[0036] It should also be noted that the system further comprises: a signal receiving processor; wherein the signal receiving processor is arranged on the ground and is connected to the testing mechanism (2) via an electrical signal.

[0037] The present invention provides a production fluid profile test system for oilfield horizontal wells, comprising: a production casing, a test mechanism, an oil pipe, a continuous oil pipe, and a check valve; the oil pipe and the test mechanism are arranged inside the production casing; the test mechanism is arranged on the outer wall of the oil pipe; the check valve is connected to the oil pipe and is arranged at the lower part of the vertical well section of the oil pipe; the continuous oil pipe is arranged inside the oil pipe and is located on the upper part of the check valve. The present invention uses the oil pipe to bring the optical fiber test cable into the target layer, and completes the production fluid profile test under the production state of the oil well through nitrogen injection and circulating gas lift in the continuous oil pipe, with accurate positioning, high test efficiency, simple process, and effectively reducing the cost of on-site construction operations. Moreover, the present invention can be applied to the judgment of medium and high water-content horizontal wells, and then take effective water control and oil stabilization measures, which provides an important basis for understanding and evaluating development effects and guiding the adjustment of development policies.

[0038] The present invention also provides a method for testing the above system, the method comprising:

[0039] Obtaining a processed production casing (1);

[0040] The test mechanism (2) is fixed to the outer wall of the oil pipe (3) to obtain a composite oil pipe;

[0041] The composite oil pipe is lowered to the horizontal section of the horizontal well to be tested, and the coiled oil pipe (4) is inserted into the oil pipe (3) and positioned above the check valve (5);

[0042] Temperature information is obtained by injecting nitrogen gas into the coiled tubing (4) from the surface;

[0043] The check valve (5) is connected to the oil pipe (3) and is arranged at the lower part of the vertical well section of the oil pipe (3).

[0044] The oil pipe (3) and the testing mechanism (2) are arranged inside the production casing (1); the testing mechanism (2) is arranged on the outer wall of the oil pipe (3); and the continuous oil pipe (4) is arranged inside the oil pipe (3) and is located above the check valve (5).

[0045] Specifically, the testing mechanism (2) is an optical fiber testing cable.

[0046] Specifically, the length of the optical fiber test cable is the same as the length of the oil pipe (3).

[0047] It should also be noted that the system further comprises: a signal receiving processor; wherein the signal receiving processor is arranged on the ground and is connected to the testing mechanism (2) via an electrical signal.

[0048] Specifically, the method can be understood as follows: in actual use, the wellbore to be tested is firstly cleared, sand washed, and casing scraped; then the fiber optic test cable is fixed to the outer wall of the oil pipe, and the oil pipe is lowered into the horizontal well to be tested; the single-flow valve is lowered along the oil pipe to the lower part of the horizontal well diameter section; then, a continuous oil pipe is lowered into the oil pipe to the upper part of the single-flow valve; nitrogen is then injected into the continuous oil pipe from the ground for gas lift. During the pumping process and the horizontal well gas lift production process, the fluid in the wellbore flows through the fiber optic test cable, and the fiber optic test cable obtains the wellbore temperature information and transmits the temperature information to the signal receiving processor in the form of an electrical signal, so that the ground can directly read the profile data of the temperature in the wellbore, providing a basis for the later implementation of water control and oil stabilization in the horizontal well.

[0049] The present invention uses a coiled tubing to bring the test pipeline into the target layer, drags the coiled tubing to inject nitrogen and circulate gas lift to complete the production profile test of the oil well under production conditions, with accurate positioning, high test efficiency, simple procedures, and can reduce on-site construction costs. The present invention is applied to the judgment of medium and high water-content horizontal wells, and then takes water control and oil stabilization measures, providing an important means for understanding and evaluating development effects and guiding the adjustment of development policies.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for testing the production profile of a horizontal well in an oil field, characterized in that: include: Production casing (1), testing mechanism (2), oil pipe (3), coiled tubing (4), check valve (5); The oil pipe (3) and the testing mechanism (2) are arranged inside the production casing (1); the testing mechanism (2) is arranged on the outer wall of the oil pipe (3); the check valve (5) is connected to the oil pipe (3) and is arranged at the lower part of the vertical well section of the oil pipe (3); the continuous oil pipe (4) is arranged inside the oil pipe (3) and is located above the check valve (5).

2. The oilfield horizontal well production profile testing system according to claim 1, characterized in that: The testing mechanism (2) is an optical fiber testing cable.

3. The oilfield horizontal well production profile testing system according to claim 2, characterized in that: The length of the optical fiber test cable is the same as the length of the oil pipe (3).

4. The oilfield horizontal well production profile testing system according to claim 1, characterized in that: The system further comprises: a signal receiving processor; wherein the signal receiving processor is arranged on the ground and is connected to the testing mechanism (2) via an electrical signal.

5. A testing method based on the system according to any one of claims 1 to 4, characterized in that: The method comprises: Obtaining a processed production casing (1); The test mechanism (2) is fixed to the outer wall of the oil pipe (3) to obtain a composite oil pipe; The composite oil pipe is lowered to the horizontal section of the horizontal well to be tested, and the coiled oil pipe (4) is inserted into the oil pipe (3) and positioned above the check valve (5); Temperature information is obtained by injecting nitrogen gas into the coiled tubing (4) from the surface; The check valve (5) is connected to the oil pipe (3) and is arranged at the lower part of the vertical well section of the oil pipe (3).

6. The testing method according to claim 5, characterized in that: A processed production casing (1) is obtained, comprising: The horizontal well to be tested is dredged, sand-washed and well-washed, and the casing is scraped to obtain a processed production casing (1).

7. The testing method according to claim 5, characterized in that: The testing mechanism (2) is an optical fiber testing cable.

8. The testing method according to claim 5, characterized in that: The length of the optical fiber test cable is the same as the length of the oil pipe (3).

9. The testing method according to claim 5, characterized in that: The temperature information is obtained, comprising: the fluid in the wellbore flows through the testing mechanism (2), the testing mechanism (2) obtains the wellbore temperature information and transmits the temperature information in the form of an electrical signal to a signal receiving processor.

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