Blowout prevention lubrication pressure reducer for water injection well testing

Abstract

The invention discloses a blowout prevention lubricating pressure reducer for water injection well testing, and belongs to the technical field of water injection well testing. Comprising a connecting rod connected with a lubricating oil cup, a through hole b is formed in the connecting rod and communicated with the lubricating oil cup, the lubricating oil cup is connected with a pressing cap in a sealing mode, a through hole a is formed in the pressing cap, a plurality of pressure relief holes are formed in the side surface of the connecting rod, and the connecting rod penetrates through and is fixedly connected with an overflow liquid cup. The sealing device has the advantages that the sealing gasket and the cable are lubricated through lubricating oil contained in the lubricating oil cup, abrasion between the cable and the flow blocking gasket is reduced, the effects of reducing large pulling force borne by the cable and protecting the cable are achieved, the service life of the device can be prolonged, and the situation that a wellhead is not sealed tightly is improved.

Description

Technical Field

[0001] The invention relates to a blowout prevention lubrication pressure reducer for water injection well testing, belonging to the technical field of water injection well testing. Background Art

[0002] After the oil field is put into development, as the mining time increases, the energy of the oil layer itself will be continuously consumed, and the oil layer pressure will continue to drop, causing a large amount of underground crude oil to be degassed, the viscosity to increase, the oil well production to decrease, and even the spraying and production to stop, resulting in a large amount of dead oil remaining underground that cannot be extracted. In order to make up for the underground deficit caused by the extraction of crude oil, maintain or increase the oil layer pressure, achieve high and stable production of the oil field, and obtain a higher recovery rate, the oil field must be injected with water. In order to accurately monitor or allocate the amount of water injected into the formation, electronic instruments need to be used for testing, so that effective control can be achieved. In order to improve the accuracy of single-layer injection, the use of cable direct reading and allocation technology has become the mainstream process of refined water injection.

[0003] At present, in the process of testing water injection wells in major oil fields in my country, the wellhead blowout prevention sealing devices commonly used mostly use threaded buckles to tighten the packing pads to enhance the sealing effect. Although high-pressure blowout prevention control devices are used, due to the high pressure in the water injection wells, overflow still occurs to a greater or lesser extent. The overflow volume also changes with the pressure in the well, the change in the thickness of the cable, and the tightness of the control device. Most of the overflowed well fluid is discharged to the well site, which pollutes the environment and brings great inconvenience to the operators on site. Therefore, in the monitoring and deployment process of water injection wells, the sealing performance and maintenance performance of the wellhead sealing device play an important role in environmental protection and the success of the test.

[0004] At present, the structural design of the blowout prevention device at the wellhead of the water injection well test is unreasonable, the sealing gap is large, and the cable and the packing rub violently when the instrument is lowered into the well during the test, causing increased wear of the cable and the packing, shortening the service life of the packing, and serious wear of the packing leads to poor sealing of the wellhead, which brings safety hazards to production. At the same time, it is easy to cause the test plug to leak, causing certain pollution to the environment. The existing technology cannot solve the above problems well. Summary of the invention

[0005] It can be seen from the current situation and existing problems that solving the overflow and leakage of test equipment is the fundamental to achieve high quality and zero pollution in refined water injection. Therefore, how to make the wellhead seal and prevent blowout and reduce the pollution caused by overflow and leakage during operation is an urgent problem that needs to be solved. In order to solve the defects of the prior art, the purpose of the present invention is to provide a blowout prevention lubrication pressure reducer for water injection well testing, so as to effectively control the overflow size, wellhead sealing and cable protection during downhole testing, thereby meeting various requirements of production testing, while reducing environmental pollution caused by overflow and improving work efficiency.

[0006] The technical solution of the present invention is: a blowout prevention lubrication pressure reducer for testing water injection wells, including a connecting rod connected to a lubricating oil cup, the connecting rod is provided with a through hole b, the through hole b is connected to the lubricating oil cup, the lubricating oil cup is sealed and connected to a pressure cap, the pressure cap is provided with a through hole a, a plurality of pressure relief holes are provided on the side surface of the connecting rod, the connecting rod passes through and is fixedly connected to the overflow liquid cup.

[0007] The lubricating oil cup is sealed and connected to the pressure cap via a sealing ring.

[0008] The through hole a is coaxial with the through hole b.

[0009] An end cover is provided at the end of the overflow liquid cup, and the connecting rod passes through the end cover.

[0010] The end cover is threadedly connected to the overflow liquid cup.

[0011] The overflow liquid cup is provided with a liquid discharge hole.

[0012] The drainage hole is connected to a drainage pipe, and the outlet of the drainage pipe is located in the water collecting tank.

[0013] The side surface of the connecting rod is provided with three groups of pressure relief holes, each group having three pressure relief holes.

[0014] The overflow liquid cup is sealed and connected to the wellhead of the water injection well.

[0015] The overflow liquid cup is provided with a liquid inlet hole.

[0016] The beneficial effects of the present invention are:

[0017] (1) When the control instrument is lowered into the well, the lubricating oil contained in the lubricating oil cup can be used to lubricate the sealing gasket and the cable, thereby reducing the wear between the cable and the flow-blocking gasket, reducing the large tensile force on the cable, protecting the cable, and prolonging the service life of the device and improving the situation of poor sealing at the wellhead.

[0018] (2) The present invention improves the sealing effect of the water injection well test, and can achieve no puncture and no leakage during the test, which not only reduces the pollution of the well site and the surrounding environment but also eliminates safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention.

[0020] The reference numerals in the figure are as follows: 1. pressure cap, 1.1. through hole a, 2. lubricating oil cup, 3. connecting rod, 3.1. through hole b, 3.2. pressure relief hole, 4. end cover, 5. overflow liquid cup, 5.1. liquid inlet hole. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the present invention will be described in detail below in combination with the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0025] The following is combined with Figure 1 The present invention is further described in detail: This application is further described by taking this as an example.

[0026] Example 1

[0027] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 being used for the lifting and lowering of cables for testing equipment, the through hole b3.1 being connected to the lubricating oil cup 2, the lubricating oil cup 2 being used for containing lubricating oil during operation, the cable being lubricated by the lubricating oil during the lifting and lowering process, thereby reducing wear, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, the side surface of the connecting rod 3 having a plurality of pressure relief holes 3.2, the connecting rod 3 passing through and being fixedly connected to an overflow liquid cup 5.

[0028] The lubricating oil cup 2 is sealed and connected to the pressure cap 1 via a sealing ring.

[0029] Example 2

[0030] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 being connected to the lubricating oil cup 2, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, the cable for the testing equipment being able to penetrate and move along the through hole a1.1, a plurality of pressure relief holes 3.2 being formed on the side surface of the connecting rod 3, the connecting rod 3 penetrating and being fixedly connected to an overflow liquid cup 5.

[0031] The through hole a1.1 is coaxial with the through hole b3.1, so that the cable does not bend when passing through the through hole a1.1 and the through hole b3.1, and the cable can be taken up and down more smoothly.

[0032] Example 3

[0033] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 communicating with the lubricating oil cup 2, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, a plurality of pressure relief holes 3.2 being formed on the side surface of the connecting rod 3, the connecting rod 3 passing through and fixedly connected to an overflow liquid cup 5.

[0034] An end cover 4 is provided at the end of the overflow liquid cup 5 , and the connecting rod 3 passes through the end cover 4 .

[0035] The end cover 4 is threadedly connected to the overflow liquid cup 5. The end cover 4 can prevent the overflow liquid entering the overflow liquid cup 5 from overflowing.

[0036] Example 4

[0037] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 communicating with the lubricating oil cup 2, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, a plurality of pressure relief holes 3.2 being formed on the side surface of the connecting rod 3, the connecting rod 3 passing through and fixedly connected to an overflow liquid cup 5.

[0038] The overflow liquid cup 5 is provided with a drainage hole.

[0039] The drain hole is connected to a drain pipe, and the outlet of the drain pipe is located in the water collecting tank. The liquid entering the overflow liquid cup 5 is discharged into the water collecting tank through the drain hole and the drain pipe.

[0040] Example 5

[0041] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 communicating with the lubricating oil cup 2, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, a plurality of pressure relief holes 3.2 being formed on the side surface of the connecting rod 3, the connecting rod 3 passing through and fixedly connected to an overflow liquid cup 5.

[0042] The side surface of the connecting rod 3 is provided with three groups of pressure relief holes 3.2, each group having three pressure relief holes 3.2.

[0043] Example 6

[0044] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 communicating with the lubricating oil cup 2, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, a plurality of pressure relief holes 3.2 being formed on the side surface of the connecting rod 3, the connecting rod 3 passing through and fixedly connected to an overflow liquid cup 5.

[0045] The overflow liquid cup 5 is sealedly connected to the wellhead of the water injection well, thereby preventing the liquid in the well from spraying out from the wellhead.

[0046] Example 7

[0047] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 communicating with the lubricating oil cup 2, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, a plurality of pressure relief holes 3.2 being formed on the side surface of the connecting rod 3, the connecting rod 3 passing through and fixedly connected to an overflow liquid cup 5.

[0048] The overflow liquid cup 5 is provided with a liquid inlet hole 5.1. The liquid in the well can directly enter the overflow liquid cup 5 from the liquid inlet hole 5.1 under the action of the well pressure.

[0049] Example 8

[0050] A blowout prevention lubrication pressure reducer for testing water injection wells, comprising a connecting rod 3 connected to a lubricating oil cup 2, the connecting rod 3 having a through hole b3.1, the through hole b3.1 communicating with the lubricating oil cup 2, the lubricating oil cup 2 being sealingly connected to a pressure cap 1, the pressure cap 1 having a through hole a1.1, a plurality of pressure relief holes 3.2 being formed on the side surface of the connecting rod 3, the connecting rod 3 passing through and fixedly connected to an overflow liquid cup 5.

[0051] The lubricating oil cup 2 is sealed and connected to the pressure cap 1 via a sealing ring.

[0052] The through hole a1.1 is coaxial with the through hole b3.1.

[0053] An end cover 4 is provided at the end of the overflow liquid cup 5 , and the connecting rod 3 passes through the end cover 4 .

[0054] The end cover 4 is threadedly connected to the overflow liquid cup 5 .

[0055] The overflow liquid cup 5 is provided with a drainage hole.

[0056] The drainage hole is connected to a drainage pipe, and the outlet of the drainage pipe is located in the water collecting tank.

[0057] The side surface of the connecting rod 3 is provided with three groups of pressure relief holes 3.2, each group having three pressure relief holes 3.2.

[0058] The overflow liquid cup 5 is sealed and connected to the wellhead of the water injection well.

[0059] The overflow liquid cup 5 is provided with a liquid inlet hole 5.1.

[0060] When the temperature is low, antifreeze alcohol can also be added to the oil cup to improve the antifreeze ability of the sealing head and improve the safety of the sealing head.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A blowout prevention lubrication pressure reducer for water injection well testing, characterized in that: The invention comprises a connecting rod (3) connected to a lubricating oil cup (2), the connecting rod (3) being provided with a through hole b (3.1), the through hole b (3.1) being connected to the lubricating oil cup (2), the lubricating oil cup (2) being sealingly connected to a pressure cap (1), the pressure cap (1) being provided with a through hole a (1.1), a plurality of pressure relief holes (3.2) being provided on a side surface of the connecting rod (3), and the connecting rod (3) passing through and being fixedly connected to an overflow liquid cup (5).

2. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 1, characterized in that: The lubricating oil cup (2) is sealedly connected to the pressure cap (1) via a sealing ring.

3. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 1, characterized in that: The through hole a (1.1) is coaxial with the through hole b (3.1).

4. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 1, characterized in that: An end cover (4) is provided at the end of the overflow liquid cup (5), and the connecting rod (3) passes through the end cover (4).

5. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 4, characterized in that: The end cover (4) is threadedly connected to the overflow liquid cup (5).

6. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 1, characterized in that: The overflow liquid cup (5) is provided with a liquid discharge hole.

7. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 6, characterized in that: The drainage hole is connected to a drainage pipe, and the outlet of the drainage pipe is located in the water collecting tank.

8. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 1, characterized in that: The side surface of the connecting rod (3) is provided with three groups of pressure relief holes (3.2), each group having three pressure relief holes (3.2).

9. The anti-blowout lubrication pressure reducer for water injection well testing according to claim 1, characterized in that: The overflow liquid cup (5) is sealedly connected to the wellhead of the water injection well.

10. The blowout prevention lubrication pressure reducer for water injection well testing according to claim 1, characterized in that: The overflow liquid cup (5) is provided with a liquid inlet hole (5.1).

Images