High-strength sealing thread compound for deep well pipe column and preparation method

A high-strength sealing, thread grease technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of connection sealing failure, loose threaded joints, etc., to ensure sealing performance, good high temperature resistance, and comprehensive cost. low effect

Inactive Publication Date: 2009-06-10
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the fluctuation of the external load, the collision between the pipe string and the well wall / casing inner wall, the impact on the lower cementing casing string and the excessive vibration of the drill bit during deep well drilling, etc. Loose threaded joints, resulting in failure of the joint seal

Method used

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  • High-strength sealing thread compound for deep well pipe column and preparation method
  • High-strength sealing thread compound for deep well pipe column and preparation method
  • High-strength sealing thread compound for deep well pipe column and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] When the threaded connection of the pipe column needs to be disassembled, according to the weight, the component A is composed of 10% E51 epoxy resin, 5% carboxylated nitrile rubber, 27% AG epoxy resin, 6% 501 thinner, 3% cyanide, and dicyandioxide 30% of aluminum, 16% of aluminum powder, and 3% of fumed silica; component B is amine-105 epoxy curing agent accounting for 5% by weight of component A.

[0014] The test results of technical indicators are shown in Table 1.

[0015] Table 1 Example 1 Performance Test Result Table

[0016]

[0017] This formula has been tested in 12 deep wells. After making up and breaking out of the casing twice, there is no sticking phenomenon. There is no looseness at the joint of the lower Φ244.5×11.99mm Q125 casing string and the sealing performance is good. The downhole temperature is 160°C .

Embodiment 2

[0019] The connection that does not need to be disassembled, according to the weight of component A, is composed of E51 epoxy resin 13%, carboxylated nitrile rubber 5%, AG epoxy resin 30%, 501 thinner 3%, butylcyanide 11%, aluminum oxide 30% , 5% of aluminum powder, 3% of fumed silica; B component is amine-105 epoxy curing agent accounting for 7% of the weight of A component.

[0020] The test results of technical indicators are shown in Table 2.

[0021] Table 2 Example 2 Performance Test Result Table

[0022]

[0023] This formula has been tested in 21 deep wells. During the whole drilling process, there is no loosening phenomenon at the connection of the surface casing, and there is no loosening at the connection of the lower Φ177.8×12.65mm V140 casing string, and the sealing performance is good. The downhole temperature is 180°C. And improve the connection strength of the whole string.

Embodiment 3

[0025] Winter construction, according to the weight of component A, it is composed of E51 epoxy resin 13%, carboxylated nitrile rubber 3%, AG epoxy resin 30%, 501 thinner 10%, butylcyanide 6%, aluminum oxide 30%, aluminum powder 5%, fumed silicon dioxide 3%; component B is amine-105 epoxy curing agent accounting for 10% by weight of component A.

[0026] The test results of technical indicators are shown in Table 3.

[0027] Table 3 Example 3 Performance Test Result Table

[0028]

[0029] This formula has been tested in 9 deep wells. During the whole drilling process, there is no loosening of the surface casing connection, and the lower Φ177.8×13.72mm V140 tie-back casing string and Φ139.7×14.27mm V140 liner casing string There is no looseness at the connection and the sealing performance is good. The downhole temperature is 185°C, and the connection strength of the entire string is improved.

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Abstract

The invention relates to a joint of a drill rod, an oil pipe, a sleeve and other oil well pipes for drilling operation in a deep well and an ultra-deep well, a high-strength sealing thread compound for a pipe column of a deep well to improve thread connecting performance of the pipe column and a method for preparing the thread compound. The thread compound consists of two compositions A and B which are mixed; the composition A comprises the following compositions by weight percentage: 10 to 15 percent of E51 epoxy resin, 1 to 8 percent of carboxy nitrile rubber, 15 to 30 percent of AG epoxy resin, 2 to 10 percent of 501 thinner, 3 to 12 percent of butyronitrile, 15 to 30 percent of aluminium oxide, 5 to 16 percent of aluminum powder and 1 to 5 percent of aerosil; the composition B consists of a condensed amino-105 epoxy curing agent; and according to the composition A being 100 weight percent, the addition amount of the composition B is 5 to 10 percent of the weight of the composition A. The thread compound has good high-temperature resistance, can effectively prevent a connecting part of the underground pipe column of the deep well from loosening, can ensure the sealing performance at high temperature and simultaneously increases the connecting strength between the oil pipe column and the sleeve pipe column.

Description

technical field [0001] The invention relates to a joint of oil well pipes such as drill pipes, oil pipes, and casings in deep well and ultra-deep well drilling operations, and a high-strength sealing thread grease for deep well pipe strings and a preparation method for improving the thread connection performance of pipe strings. Background technique [0002] The development of deep wells and ultra-deep wells has led to higher working pressure and increased formation temperature. As a result, loosening, leakage and sticking of joints of oil well pipes such as drill pipes, tubing and casings have become important problems. In deep well drilling and production operations, the lower oil well string not only bears various dangerous loads such as axial load, internal and external pressure, and formation slip shear, but also bears high temperature loads above 150°C, which requires that the threaded connection parts not only To be able to withstand various loads, it is also necessar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/00
Inventor 王耀光林凯王建军杜迅风
Owner BC P INC CHINA NAT PETROLEUM CORP
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